LIBTALLOC_LIBS=@LIBTALLOC_LIBS@
LIBTDB_LIBS=@LIBTDB_LIBS@
LIBNETAPI_LIBS=@LIBNETAPI_LIBS@
-LIBLUA_LIBS=@LIBLUA_LIBS@
LIBSMBCLIENT_LIBS=@LIBSMBCLIENT_LIBS@
LIBSMBSHAREMODES_LIBS=@LIBSMBSHAREMODES_LIBS@
$(PASSWD_UTIL_OBJ) utils/net_dns.o utils/net_ads_gpo.o \
utils/net_conf.o utils/net_join.o utils/net_user.o \
utils/net_group.o utils/net_file.o utils/net_registry.o \
- auth/token_util.o utils/net_dom.o utils/net_share.o utils/net_lua.o \
+ auth/token_util.o utils/net_dom.o utils/net_share.o \
utils/net_eventlog.o
# these are not processed by make proto
$(KRB5LIBS) $(LDAP_LIBS) $(NSCD_LIBS) $(DNSSD_LIBS) \
$(LIBTALLOC_LIBS) $(LIBTDB_LIBS) $(LIBWBCLIENT_LIBS) $(ZLIB_LIBS)
-bin/net@EXEEXT@: $(BINARY_PREREQS) $(NET_OBJ) @BUILD_POPT@ @LIBTALLOC_TARGET@ @LIBTDB_TARGET@ @LIBWBCLIENT_TARGET@ @LIBNETAPI_TARGET@ @LIBLUA_TARGET@
+bin/net@EXEEXT@: $(BINARY_PREREQS) $(NET_OBJ) @BUILD_POPT@ @LIBTALLOC_TARGET@ @LIBTDB_TARGET@ @LIBWBCLIENT_TARGET@ @LIBNETAPI_TARGET@
@echo Linking $@
@$(CC) -o $@ $(NET_OBJ) $(DYNEXP) $(LDFLAGS) $(LIBS) \
$(POPT_LIBS) $(KRB5LIBS) $(UUID_LIBS) $(LDAP_LIBS) \
$(PASSDB_LIBS) $(TERMLDFLAGS) $(TERMLIBS) $(NSCD_LIBS) \
- @INIPARSERLIBS@ $(LIBTALLOC_LIBS) $(LIBTDB_LIBS) $(LIBWBCLIENT_LIBS) $(LIBNETAPI_LIBS) $(LIBLUA_LIBS) -lm \
+ @INIPARSERLIBS@ $(LIBTALLOC_LIBS) $(LIBTDB_LIBS) $(LIBWBCLIENT_LIBS) $(LIBNETAPI_LIBS) \
$(ZLIB_LIBS)
bin/profiles@EXEEXT@: $(BINARY_PREREQS) $(PROFILES_OBJ) @BUILD_POPT@ @LIBTALLOC_TARGET@ @LIBTDB_TARGET@
# it can be fixed or if they just can't be called from a static
# library.
-#-------------------------------------------------------------------
-#
-# libsmblua
-#
-#-------------------------------------------------------------------
-
-LIBLUA_OBJ0 = @LIBLUA_OBJ0@
-
-LIBLUA_OBJ = $(LIBLUA_OBJ0)
-
-LIBLUA_SHARED_TARGET=@LIBLUA_SHARED_TARGET@
-LIBLUA_SOVER=@LIBLUA_SOVER@
-LIBLUA_SHARED_TARGET_SONAME=$(LIBLUA_SHARED_TARGET).$(LIBLUA_SOVER)
-LIBLUA_STATIC_TARGET=@LIBLUA_STATIC_TARGET@
-LIBLUA=@LIBLUA_STATIC@ @LIBLUA_SHARED@
-LIBLUA_SYMS=$(srcdir)/exports/liblua.@SYMSEXT@
-LIBLUA_HEADERS=$(srcdir)/lua-5.1.4/src/lua.h
-
-$(LIBLUA_SHARED_TARGET_SONAME): $(BINARY_PREREQS) $(LIBLUA_OBJ) $(LIBLUA_SYMS) @LIBTALLOC_TARGET@ @LIBTDB_TARGET@
- @echo Linking shared library $@
- @$(SHLD_DSO) $(LIBLUA_OBJ) \
- $(LIBS) $(LIBTALLOC_LIBS) $(LIBTDB_LIBS) \
- $(KRB5LIBS) $(LDAP_LIBS) \
- @SONAMEFLAG@`basename $@`
-
-$(LIBLUA_SHARED_TARGET): $(LIBLUA_SHARED_TARGET_SONAME)
- @rm -f $@
- @ln -f -s `basename $(LIBLUA_SHARED_TARGET_SONAME)` $@
-
-$(LIBLUA_STATIC_TARGET): $(BINARY_PREREQS) $(LIBLUA_OBJ0)
- @echo Linking non-shared library $@
- @-$(AR) -rc $@ $(LIBLUA_OBJ0)
-
-liblua: $(LIBLUA)
-
-cleanliblua::
- -rm -f \
- $(LIBLUA_SHARED_TARGET) \
- $(LIBLUA_SHARED_TARGET_SONAME) \
- $(LIBLUA_STATIC_TARGET)
-
-installliblua:: installdirs liblua
- @$(SHELL) $(srcdir)/script/installdirs.sh $(INSTALLPERMS_BIN) $(DESTDIR) $(LIBDIR)
- -$(INSTALLLIBCMD_SH) $(LIBLUA_SHARED_TARGET_SONAME) $(DESTDIR)$(LIBDIR)
- @rm -f $(DESTDIR)$(LIBDIR)/`basename $(LIBLUA_SHARED_TARGET)`
- -if test -f $(LIBLUA_SHARED_TARGET_SONAME) ; then \
- ln -f -s `basename $(LIBLUA_SHARED_TARGET_SONAME)` \
- $(DESTDIR)$(LIBDIR)/`basename $(LIBLUA_SHARED_TARGET)` ; \
- fi
- -$(INSTALLLIBCMD_A) $(LIBLUA_STATIC_TARGET) $(DESTDIR)$(LIBDIR)
- @$(SHELL) $(srcdir)/script/installdirs.sh $(INSTALLPERMS_BIN) $(DESTDIR) ${prefix}/include
- -$(INSTALLCMD) -m $(INSTALLPERMS_DATA) $(LIBLUA_HEADERS) $(DESTDIR)${prefix}/include
-
-uninstallliblua::
- -rm -f $(DESTDIR)$(LIBDIR)/`basename $(LIBLUA_SHARED_TARGET)`
- -$(UNINSTALLLIBCMD_SH) $(DESTDIR)$(LIBDIR)/`basename $(LIBLUA_SHARED_TARGET_SONAME)`
- -$(UNINSTALLLIBCMD_A) $(DESTDIR)$(LIBDIR)/`basename $(LIBLUA_STATIC_TARGET)`
- -rm -f $(DESTDIR)${prefix}/include/smb_share_modes.h
-
-libs:: liblua
-installlibs:: @INSTALL_LIBLUA@
-uninstalllibs:: @UNINSTALL_LIBLUA@
-cleanlibs:: cleanliblua
-shlibs test_shlibs: @LIBLUA_SHARED@
-
-showliblua:
- @echo ""
- @echo "LIBLUA_SHARED = @LIBLUA_SHARED@"
- @echo "LIBLUA_STATIC = @LIBLUA_STATIC@"
- @echo "LIBLUA_TARGET = @LIBLUA_TARGET@"
- @echo "LIBLUA_LIBS = $(LIBLUA_LIBS)"
- @echo ""
- @echo "LIBLUA_SHARED_TARGET = $(LIBLUA_SHARED_TARGET)"
- @echo "LIBLUA_SOVER = $(LIBLUA_SOVER)"
- @echo "LIBLUA_SHARED TARGET_SONAME = $(LIBLUA_SHARED_TARGET_SONAME)"
- @echo "LIBLUA_STATIC_TARGET = $(LIBLUA_STATIC_TARGET)"
- @echo "LIBLUA = $(LIBLUA)"
-
-showlibs:: showliblua
-
-
#####################################################################
#
# shared modules
AC_SUBST(TDBTORTURE)
fi
-
-AC_ARG_ENABLE(external_liblua,
- [AS_HELP_STRING([--enable-external-liblua],
- [Enable external lua [default=auto]])],
- [ enable_external_liblua=$enableval ],
- [ enable_external_liblua=auto ])
-
-if test "x$enable_external_liblua" != xno
-then
- PKG_CHECK_MODULES(LIBLUA, lua5.1 >= 5.1.4,
- [ enable_external_liblua=yes ],
- [
- if test x$enable_external_liblua = xyes; then
- AC_MSG_ERROR([Unable to find liblua])
- else
- enable_external_liblua=no
- fi
- ])
-fi
-
-AC_SUBST(LIBLUA_OBJ0)
-if test "x$enable_external_liblua" = xno
-then
- LINK_LIBLUA=STATIC
- SMB_LIBRARY(lua, 0)
- LIBLUA_OBJ0="lua-5.1.4/src/lapi.o lua-5.1.4/src/lauxlib.o \
- lua-5.1.4/src/lbaselib.o lua-5.1.4/src/lcode.o \
- lua-5.1.4/src/ldblib.o lua-5.1.4/src/ldebug.o lua-5.1.4/src/ldo.o \
- lua-5.1.4/src/ldump.o lua-5.1.4/src/lfunc.o lua-5.1.4/src/lgc.o \
- lua-5.1.4/src/linit.o lua-5.1.4/src/liolib.o lua-5.1.4/src/llex.o \
- lua-5.1.4/src/lmathlib.o lua-5.1.4/src/lmem.o \
- lua-5.1.4/src/loadlib.o lua-5.1.4/src/lobject.o \
- lua-5.1.4/src/lopcodes.o lua-5.1.4/src/loslib.o \
- lua-5.1.4/src/lparser.o lua-5.1.4/src/lstate.o \
- lua-5.1.4/src/lstring.o lua-5.1.4/src/lstrlib.o \
- lua-5.1.4/src/ltable.o lua-5.1.4/src/ltablib.o lua-5.1.4/src/ltm.o \
- lua-5.1.4/src/lundump.o lua-5.1.4/src/lvm.o \
- lua-5.1.4/src/lzio.o lua-5.1.4/src/print.o"
- AC_SUBST(LIBLUA_OBJ0)
-fi
-
SMB_LIBRARY(netapi, 0)
SMB_LIBRARY(smbclient, 0)
SMB_LIBRARY(smbsharemodes, 0)
msgid " Use 'net help registry' to get more information about 'net registry' commands."
msgstr ""
-#: ../../utils/net.c:584
-msgid "Open a lua interpreter"
-msgstr ""
-
-#: ../../utils/net.c:585
-msgid " Use 'net help lua' to get more information about 'net lua' commands."
-msgstr ""
-
#: ../../utils/net.c:591
msgid "Process Win32 *.evt eventlog files"
msgstr ""
"Usage: \n"
msgstr ""
-#: ../../utils/net_lua.c:60
-msgid "connect: Expected IP-Address"
-msgstr ""
-
-#: ../../utils/net_lua.c:65
-msgid "connect: Expected port"
-msgstr ""
-
-#: ../../utils/net_lua.c:84
-#, c-format
-msgid "connect failed: %s"
-msgstr ""
-
-#: ../../utils/net_lua.c:132
-#, c-format
-msgid "socket domain %s unknown"
-msgstr ""
-
-#: ../../utils/net_lua.c:144
-#, c-format
-msgid "socket type %s unknown"
-msgstr ""
-
-#: ../../utils/net_lua.c:155
-#, c-format
-msgid "socket() failed: %s"
-msgstr ""
-
-#: ../../utils/net_lua.c:278
-msgid "evt_reference_thread failed\n"
-msgstr ""
-
-#: ../../utils/net_lua.c:287
-msgid "event_add_timed failed"
-msgstr ""
-
-#: ../../utils/net_lua.c:300
-msgid "event_once called from non-base thread"
-msgstr ""
-
-#: ../../utils/net_lua.c:323
-msgid "event_context_init failed"
-msgstr ""
-
-#: ../../utils/net_lua.c:353
-msgid "lua_newstate failed\n"
-msgstr ""
-
-#: ../../utils/net_lua.c:371
-msgid "luaL_dofile returned an error\n"
-msgstr ""
-
-#: ../../utils/net_lua.c:376
-msgid "luaL_dostring returned an error\n"
-msgstr ""
-
#: ../../utils/net_rap.c:39
msgid ""
"\n"
FILES=`add_basedir_to_filelist ../../utils net.c net_ads.c net_ads_gpo.c \
net_afs.c net_cache.c net_conf.c net_dom.c net_eventlog.c net_file.c \
net_group.c net_groupmap.c net_help.c net_help_common.c net_idmap.c \
- net_join.c net_lookup.c net_lua.c net_rap.c net_registry.c \
+ net_join.c net_lookup.c net_rap.c net_registry.c \
net_registry_util.c net_rpc.c net_rpc_audit.c net_rpc_join.c \
net_rpc_printer.c net_rpc_registry.c net_rpc_rights.c net_rpc_samsync.c \
net_rpc_service.c net_rpc_sh_acct.c net_rpc_shell.c net_sam.c \
+++ /dev/null
-Lua License
------------
-
-Lua is licensed under the terms of the MIT license reproduced below.
-This means that Lua is free software and can be used for both academic
-and commercial purposes at absolutely no cost.
-
-For details and rationale, see http://www.lua.org/license.html .
-
-===============================================================================
-
-Copyright (C) 1994-2008 Lua.org, PUC-Rio.
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-
-===============================================================================
-
-(end of COPYRIGHT)
+++ /dev/null
-HISTORY for Lua 5.1
-
-* Changes from version 5.0 to 5.1
- -------------------------------
- Language:
- + new module system.
- + new semantics for control variables of fors.
- + new semantics for setn/getn.
- + new syntax/semantics for varargs.
- + new long strings and comments.
- + new `mod' operator (`%')
- + new length operator #t
- + metatables for all types
- API:
- + new functions: lua_createtable, lua_get(set)field, lua_push(to)integer.
- + user supplies memory allocator (lua_open becomes lua_newstate).
- + luaopen_* functions must be called through Lua.
- Implementation:
- + new configuration scheme via luaconf.h.
- + incremental garbage collection.
- + better handling of end-of-line in the lexer.
- + fully reentrant parser (new Lua function `load')
- + better support for 64-bit machines.
- + native loadlib support for Mac OS X.
- + standard distribution in only one library (lualib.a merged into lua.a)
-
-* Changes from version 4.0 to 5.0
- -------------------------------
- Language:
- + lexical scoping.
- + Lua coroutines.
- + standard libraries now packaged in tables.
- + tags replaced by metatables and tag methods replaced by metamethods,
- stored in metatables.
- + proper tail calls.
- + each function can have its own global table, which can be shared.
- + new __newindex metamethod, called when we insert a new key into a table.
- + new block comments: --[[ ... ]].
- + new generic for.
- + new weak tables.
- + new boolean type.
- + new syntax "local function".
- + (f()) returns the first value returned by f.
- + {f()} fills a table with all values returned by f.
- + \n ignored in [[\n .
- + fixed and-or priorities.
- + more general syntax for function definition (e.g. function a.x.y:f()...end).
- + more general syntax for function calls (e.g. (print or write)(9)).
- + new functions (time/date, tmpfile, unpack, require, load*, etc.).
- API:
- + chunks are loaded by using lua_load; new luaL_loadfile and luaL_loadbuffer.
- + introduced lightweight userdata, a simple "void*" without a metatable.
- + new error handling protocol: the core no longer prints error messages;
- all errors are reported to the caller on the stack.
- + new lua_atpanic for host cleanup.
- + new, signal-safe, hook scheme.
- Implementation:
- + new license: MIT.
- + new, faster, register-based virtual machine.
- + support for external multithreading and coroutines.
- + new and consistent error message format.
- + the core no longer needs "stdio.h" for anything (except for a single
- use of sprintf to convert numbers to strings).
- + lua.c now runs the environment variable LUA_INIT, if present. It can
- be "@filename", to run a file, or the chunk itself.
- + support for user extensions in lua.c.
- sample implementation given for command line editing.
- + new dynamic loading library, active by default on several platforms.
- + safe garbage-collector metamethods.
- + precompiled bytecodes checked for integrity (secure binary dostring).
- + strings are fully aligned.
- + position capture in string.find.
- + read('*l') can read lines with embedded zeros.
-
-* Changes from version 3.2 to 4.0
- -------------------------------
- Language:
- + new "break" and "for" statements (both numerical and for tables).
- + uniform treatment of globals: globals are now stored in a Lua table.
- + improved error messages.
- + no more '$debug': full speed *and* full debug information.
- + new read form: read(N) for next N bytes.
- + general read patterns now deprecated.
- (still available with -DCOMPAT_READPATTERNS.)
- + all return values are passed as arguments for the last function
- (old semantics still available with -DLUA_COMPAT_ARGRET)
- + garbage collection tag methods for tables now deprecated.
- + there is now only one tag method for order.
- API:
- + New API: fully re-entrant, simpler, and more efficient.
- + New debug API.
- Implementation:
- + faster than ever: cleaner virtual machine and new hashing algorithm.
- + non-recursive garbage-collector algorithm.
- + reduced memory usage for programs with many strings.
- + improved treatment for memory allocation errors.
- + improved support for 16-bit machines (we hope).
- + code now compiles unmodified as both ANSI C and C++.
- + numbers in bases other than 10 are converted using strtoul.
- + new -f option in Lua to support #! scripts.
- + luac can now combine text and binaries.
-
-* Changes from version 3.1 to 3.2
- -------------------------------
- + redirected all output in Lua's core to _ERRORMESSAGE and _ALERT.
- + increased limit on the number of constants and globals per function
- (from 2^16 to 2^24).
- + debugging info (lua_debug and hooks) moved into lua_state and new API
- functions provided to get and set this info.
- + new debug lib gives full debugging access within Lua.
- + new table functions "foreachi", "sort", "tinsert", "tremove", "getn".
- + new io functions "flush", "seek".
-
-* Changes from version 3.0 to 3.1
- -------------------------------
- + NEW FEATURE: anonymous functions with closures (via "upvalues").
- + new syntax:
- - local variables in chunks.
- - better scope control with DO block END.
- - constructors can now be also written: { record-part; list-part }.
- - more general syntax for function calls and lvalues, e.g.:
- f(x).y=1
- o:f(x,y):g(z)
- f"string" is sugar for f("string")
- + strings may now contain arbitrary binary data (e.g., embedded zeros).
- + major code re-organization and clean-up; reduced module interdependecies.
- + no arbitrary limits on the total number of constants and globals.
- + support for multiple global contexts.
- + better syntax error messages.
- + new traversal functions "foreach" and "foreachvar".
- + the default for numbers is now double.
- changing it to use floats or longs is easy.
- + complete debug information stored in pre-compiled chunks.
- + sample interpreter now prompts user when run interactively, and also
- handles control-C interruptions gracefully.
-
-* Changes from version 2.5 to 3.0
- -------------------------------
- + NEW CONCEPT: "tag methods".
- Tag methods replace fallbacks as the meta-mechanism for extending the
- semantics of Lua. Whereas fallbacks had a global nature, tag methods
- work on objects having the same tag (e.g., groups of tables).
- Existing code that uses fallbacks should work without change.
- + new, general syntax for constructors {[exp] = exp, ... }.
- + support for handling variable number of arguments in functions (varargs).
- + support for conditional compilation ($if ... $else ... $end).
- + cleaner semantics in API simplifies host code.
- + better support for writing libraries (auxlib.h).
- + better type checking and error messages in the standard library.
- + luac can now also undump.
-
-* Changes from version 2.4 to 2.5
- -------------------------------
- + io and string libraries are now based on pattern matching;
- the old libraries are still available for compatibility
- + dofile and dostring can now return values (via return statement)
- + better support for 16- and 64-bit machines
- + expanded documentation, with more examples
-
-* Changes from version 2.2 to 2.4
- -------------------------------
- + external compiler creates portable binary files that can be loaded faster
- + interface for debugging and profiling
- + new "getglobal" fallback
- + new functions for handling references to Lua objects
- + new functions in standard lib
- + only one copy of each string is stored
- + expanded documentation, with more examples
-
-* Changes from version 2.1 to 2.2
- -------------------------------
- + functions now may be declared with any "lvalue" as a name
- + garbage collection of functions
- + support for pipes
-
-* Changes from version 1.1 to 2.1
- -------------------------------
- + object-oriented support
- + fallbacks
- + simplified syntax for tables
- + many internal improvements
-
-(end of HISTORY)
+++ /dev/null
-INSTALL for Lua 5.1
-
-* Building Lua
- ------------
- Lua is built in the src directory, but the build process can be
- controlled from the top-level Makefile.
-
- Building Lua on Unix systems should be very easy. First do "make" and
- see if your platform is listed. If so, just do "make xxx", where xxx
- is your platform name. The platforms currently supported are:
- aix ansi bsd freebsd generic linux macosx mingw posix solaris
-
- If your platform is not listed, try the closest one or posix, generic,
- ansi, in this order.
-
- See below for customization instructions and for instructions on how
- to build with other Windows compilers.
-
- If you want to check that Lua has been built correctly, do "make test"
- after building Lua. Also, have a look at the example programs in test.
-
-* Installing Lua
- --------------
- Once you have built Lua, you may want to install it in an official
- place in your system. In this case, do "make install". The official
- place and the way to install files are defined in Makefile. You must
- have the right permissions to install files.
-
- If you want to build and install Lua in one step, do "make xxx install",
- where xxx is your platform name.
-
- If you want to install Lua locally, then do "make local". This will
- create directories bin, include, lib, man, and install Lua there as
- follows:
-
- bin: lua luac
- include: lua.h luaconf.h lualib.h lauxlib.h lua.hpp
- lib: liblua.a
- man/man1: lua.1 luac.1
-
- These are the only directories you need for development.
-
- There are man pages for lua and luac, in both nroff and html, and a
- reference manual in html in doc, some sample code in test, and some
- useful stuff in etc. You don't need these directories for development.
-
- If you want to install Lua locally, but in some other directory, do
- "make install INSTALL_TOP=xxx", where xxx is your chosen directory.
-
- See below for instructions for Windows and other systems.
-
-* Customization
- -------------
- Three things can be customized by editing a file:
- - Where and how to install Lua -- edit Makefile.
- - How to build Lua -- edit src/Makefile.
- - Lua features -- edit src/luaconf.h.
-
- You don't actually need to edit the Makefiles because you may set the
- relevant variables when invoking make.
-
- On the other hand, if you need to select some Lua features, you'll need
- to edit src/luaconf.h. The edited file will be the one installed, and
- it will be used by any Lua clients that you build, to ensure consistency.
-
- We strongly recommend that you enable dynamic loading. This is done
- automatically for all platforms listed above that have this feature
- (and also Windows). See src/luaconf.h and also src/Makefile.
-
-* Building Lua on Windows and other systems
- -----------------------------------------
- If you're not using the usual Unix tools, then the instructions for
- building Lua depend on the compiler you use. You'll need to create
- projects (or whatever your compiler uses) for building the library,
- the interpreter, and the compiler, as follows:
-
- library: lapi.c lcode.c ldebug.c ldo.c ldump.c lfunc.c lgc.c llex.c
- lmem.c lobject.c lopcodes.c lparser.c lstate.c lstring.c
- ltable.c ltm.c lundump.c lvm.c lzio.c
- lauxlib.c lbaselib.c ldblib.c liolib.c lmathlib.c loslib.c
- ltablib.c lstrlib.c loadlib.c linit.c
-
- interpreter: library, lua.c
-
- compiler: library, luac.c print.c
-
- If you use Visual Studio .NET, you can use etc/luavs.bat in its
- "Command Prompt".
-
- If all you want is to build the Lua interpreter, you may put all .c files
- in a single project, except for luac.c and print.c. Or just use etc/all.c.
-
- To use Lua as a library in your own programs, you'll need to know how to
- create and use libraries with your compiler.
-
- As mentioned above, you may edit luaconf.h to select some features before
- building Lua.
-
-(end of INSTALL)
+++ /dev/null
-# makefile for installing Lua
-# see INSTALL for installation instructions
-# see src/Makefile and src/luaconf.h for further customization
-
-# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================
-
-# Your platform. See PLATS for possible values.
-PLAT= none
-
-# Where to install. The installation starts in the src and doc directories,
-# so take care if INSTALL_TOP is not an absolute path.
-INSTALL_TOP= /usr/local
-INSTALL_BIN= $(INSTALL_TOP)/bin
-INSTALL_INC= $(INSTALL_TOP)/include
-INSTALL_LIB= $(INSTALL_TOP)/lib
-INSTALL_MAN= $(INSTALL_TOP)/man/man1
-#
-# You probably want to make INSTALL_LMOD and INSTALL_CMOD consistent with
-# LUA_ROOT, LUA_LDIR, and LUA_CDIR in luaconf.h (and also with etc/lua.pc).
-INSTALL_LMOD= $(INSTALL_TOP)/share/lua/$V
-INSTALL_CMOD= $(INSTALL_TOP)/lib/lua/$V
-
-# How to install. If your install program does not support "-p", then you
-# may have to run ranlib on the installed liblua.a (do "make ranlib").
-INSTALL= install -p
-INSTALL_EXEC= $(INSTALL) -m 0755
-INSTALL_DATA= $(INSTALL) -m 0644
-#
-# If you don't have install you can use cp instead.
-# INSTALL= cp -p
-# INSTALL_EXEC= $(INSTALL)
-# INSTALL_DATA= $(INSTALL)
-
-# Utilities.
-MKDIR= mkdir -p
-RANLIB= ranlib
-
-# == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
-
-# Convenience platforms targets.
-PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
-
-# What to install.
-TO_BIN= lua luac
-TO_INC= lua.h luaconf.h lualib.h lauxlib.h ../etc/lua.hpp
-TO_LIB= liblua.a
-TO_MAN= lua.1 luac.1
-
-# Lua version and release.
-V= 5.1
-R= 5.1.4
-
-all: $(PLAT)
-
-$(PLATS) clean:
- cd src && $(MAKE) $@
-
-test: dummy
- src/lua test/hello.lua
-
-install: dummy
- cd src && $(MKDIR) $(INSTALL_BIN) $(INSTALL_INC) $(INSTALL_LIB) $(INSTALL_MAN) $(INSTALL_LMOD) $(INSTALL_CMOD)
- cd src && $(INSTALL_EXEC) $(TO_BIN) $(INSTALL_BIN)
- cd src && $(INSTALL_DATA) $(TO_INC) $(INSTALL_INC)
- cd src && $(INSTALL_DATA) $(TO_LIB) $(INSTALL_LIB)
- cd doc && $(INSTALL_DATA) $(TO_MAN) $(INSTALL_MAN)
-
-ranlib:
- cd src && cd $(INSTALL_LIB) && $(RANLIB) $(TO_LIB)
-
-local:
- $(MAKE) install INSTALL_TOP=..
-
-none:
- @echo "Please do"
- @echo " make PLATFORM"
- @echo "where PLATFORM is one of these:"
- @echo " $(PLATS)"
- @echo "See INSTALL for complete instructions."
-
-# make may get confused with test/ and INSTALL in a case-insensitive OS
-dummy:
-
-# echo config parameters
-echo:
- @echo ""
- @echo "These are the parameters currently set in src/Makefile to build Lua $R:"
- @echo ""
- @cd src && $(MAKE) -s echo
- @echo ""
- @echo "These are the parameters currently set in Makefile to install Lua $R:"
- @echo ""
- @echo "PLAT = $(PLAT)"
- @echo "INSTALL_TOP = $(INSTALL_TOP)"
- @echo "INSTALL_BIN = $(INSTALL_BIN)"
- @echo "INSTALL_INC = $(INSTALL_INC)"
- @echo "INSTALL_LIB = $(INSTALL_LIB)"
- @echo "INSTALL_MAN = $(INSTALL_MAN)"
- @echo "INSTALL_LMOD = $(INSTALL_LMOD)"
- @echo "INSTALL_CMOD = $(INSTALL_CMOD)"
- @echo "INSTALL_EXEC = $(INSTALL_EXEC)"
- @echo "INSTALL_DATA = $(INSTALL_DATA)"
- @echo ""
- @echo "See also src/luaconf.h ."
- @echo ""
-
-# echo private config parameters
-pecho:
- @echo "V = $(V)"
- @echo "R = $(R)"
- @echo "TO_BIN = $(TO_BIN)"
- @echo "TO_INC = $(TO_INC)"
- @echo "TO_LIB = $(TO_LIB)"
- @echo "TO_MAN = $(TO_MAN)"
-
-# echo config parameters as Lua code
-# uncomment the last sed expression if you want nil instead of empty strings
-lecho:
- @echo "-- installation parameters for Lua $R"
- @echo "VERSION = '$V'"
- @echo "RELEASE = '$R'"
- @$(MAKE) echo | grep = | sed -e 's/= /= "/' -e 's/$$/"/' #-e 's/""/nil/'
- @echo "-- EOF"
-
-# list targets that do not create files (but not all makes understand .PHONY)
-.PHONY: all $(PLATS) clean test install local none dummy echo pecho lecho
-
-# (end of Makefile)
+++ /dev/null
-README for Lua 5.1
-
-See INSTALL for installation instructions.
-See HISTORY for a summary of changes since the last released version.
-
-* What is Lua?
- ------------
- Lua is a powerful, light-weight programming language designed for extending
- applications. Lua is also frequently used as a general-purpose, stand-alone
- language. Lua is free software.
-
- For complete information, visit Lua's web site at http://www.lua.org/ .
- For an executive summary, see http://www.lua.org/about.html .
-
- Lua has been used in many different projects around the world.
- For a short list, see http://www.lua.org/uses.html .
-
-* Availability
- ------------
- Lua is freely available for both academic and commercial purposes.
- See COPYRIGHT and http://www.lua.org/license.html for details.
- Lua can be downloaded at http://www.lua.org/download.html .
-
-* Installation
- ------------
- Lua is implemented in pure ANSI C, and compiles unmodified in all known
- platforms that have an ANSI C compiler. In most Unix-like platforms, simply
- do "make" with a suitable target. See INSTALL for detailed instructions.
-
-* Origin
- ------
- Lua is developed at Lua.org, a laboratory of the Department of Computer
- Science of PUC-Rio (the Pontifical Catholic University of Rio de Janeiro
- in Brazil).
- For more information about the authors, see http://www.lua.org/authors.html .
-
-(end of README)
+++ /dev/null
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<HTML>
-<HEAD>
-<TITLE>Lua 5.1 Reference Manual - contents</TITLE>
-<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
-<META HTTP-EQUIV="content-type" CONTENT="text/html; charset=iso-8859-1">
-<STYLE TYPE="text/css">
-ul {
- list-style-type: none ;
- list-style-position: outside ;
-}
-</STYLE>
-</HEAD>
-
-<BODY>
-
-<HR>
-<H1>
-<A HREF="http://www.lua.org/"><IMG SRC="logo.gif" ALT="" BORDER=0></A>
-Lua 5.1 Reference Manual
-</H1>
-
-This is an online version of
-<BLOCKQUOTE>
-<A HREF="http://www.amazon.com/exec/obidos/ASIN/8590379833/lua-indexmanual-20">
-<IMG SRC="cover.png" ALT="" TITLE="buy from Amazon" BORDER=1 ALIGN="left" HSPACE=12>
-</A>
-<B>Lua 5.1 Reference Manual</B>
-<BR>by R. Ierusalimschy, L. H. de Figueiredo, W. Celes
-<BR>Lua.org, August 2006
-<BR>ISBN 85-903798-3-3
-<BR><A HREF="http://www.amazon.com/exec/obidos/ASIN/8590379833/lua-indexmanual-20">
-<IMG SRC="amazon.gif" ALT="[Buy from Amazon]" BORDER=0></A>
-<BR CLEAR="all">
-</BLOCKQUOTE>
-<P>
-
-Buy a copy of this book and
-<A HREF="http://www.lua.org/donations.html">help to support</A>
-the Lua project.
-<P>
-
-The reference manual is the official definition of the Lua language.
-For a complete introduction to Lua programming, see the book
-<A HREF="http://www.lua.org/docs.html#books">Programming in Lua</A>.
-<P>
-
-<A HREF="manual.html">start</A>
-·
-<A HREF="#contents">contents</A>
-·
-<A HREF="#index">index</A>
-·
-<A HREF="http://www.lua.org/manual/5.1/pt/">português</A>
-·
-<A HREF="http://www.lua.org/manual/5.1/es/">español</A>
-<HR>
-<SMALL>
-Copyright © 2006-2008 Lua.org, PUC-Rio.
-Freely available under the terms of the
-<a href="http://www.lua.org/license.html#5">Lua license</a>.
-</SMALL>
-<P>
-
-<H2><A NAME="contents">Contents</A></H2>
-<UL style="padding: 0">
-<LI><A HREF="manual.html">1 - Introduction</A>
-<P>
-<LI><A HREF="manual.html#2">2 - The Language</A>
-<UL>
-<LI><A HREF="manual.html#2.1">2.1 - Lexical Conventions</A>
-<LI><A HREF="manual.html#2.2">2.2 - Values and Types</A>
-<UL>
-<LI><A HREF="manual.html#2.2.1">2.2.1 - Coercion</A>
-</UL>
-<LI><A HREF="manual.html#2.3">2.3 - Variables</A>
-<LI><A HREF="manual.html#2.4">2.4 - Statements</A>
-<UL>
-<LI><A HREF="manual.html#2.4.1">2.4.1 - Chunks</A>
-<LI><A HREF="manual.html#2.4.2">2.4.2 - Blocks</A>
-<LI><A HREF="manual.html#2.4.3">2.4.3 - Assignment</A>
-<LI><A HREF="manual.html#2.4.4">2.4.4 - Control Structures</A>
-<LI><A HREF="manual.html#2.4.5">2.4.5 - For Statement</A>
-<LI><A HREF="manual.html#2.4.6">2.4.6 - Function Calls as Statements</A>
-<LI><A HREF="manual.html#2.4.7">2.4.7 - Local Declarations</A>
-</UL>
-<LI><A HREF="manual.html#2.5">2.5 - Expressions</A>
-<UL>
-<LI><A HREF="manual.html#2.5.1">2.5.1 - Arithmetic Operators</A>
-<LI><A HREF="manual.html#2.5.2">2.5.2 - Relational Operators</A>
-<LI><A HREF="manual.html#2.5.3">2.5.3 - Logical Operators</A>
-<LI><A HREF="manual.html#2.5.4">2.5.4 - Concatenation</A>
-<LI><A HREF="manual.html#2.5.5">2.5.5 - The Length Operator</A>
-<LI><A HREF="manual.html#2.5.6">2.5.6 - Precedence</A>
-<LI><A HREF="manual.html#2.5.7">2.5.7 - Table Constructors</A>
-<LI><A HREF="manual.html#2.5.8">2.5.8 - Function Calls</A>
-<LI><A HREF="manual.html#2.5.9">2.5.9 - Function Definitions</A>
-</UL>
-<LI><A HREF="manual.html#2.6">2.6 - Visibility Rules</A>
-<LI><A HREF="manual.html#2.7">2.7 - Error Handling</A>
-<LI><A HREF="manual.html#2.8">2.8 - Metatables</A>
-<LI><A HREF="manual.html#2.9">2.9 - Environments</A>
-<LI><A HREF="manual.html#2.10">2.10 - Garbage Collection</A>
-<UL>
-<LI><A HREF="manual.html#2.10.1">2.10.1 - Garbage-Collection Metamethods</A>
-<LI><A HREF="manual.html#2.10.2">2.10.2 - Weak Tables</A>
-</UL>
-<LI><A HREF="manual.html#2.11">2.11 - Coroutines</A>
-</UL>
-<P>
-<LI><A HREF="manual.html#3">3 - The Application Program Interface</A>
-<UL>
-<LI><A HREF="manual.html#3.1">3.1 - The Stack</A>
-<LI><A HREF="manual.html#3.2">3.2 - Stack Size</A>
-<LI><A HREF="manual.html#3.3">3.3 - Pseudo-Indices</A>
-<LI><A HREF="manual.html#3.4">3.4 - C Closures</A>
-<LI><A HREF="manual.html#3.5">3.5 - Registry</A>
-<LI><A HREF="manual.html#3.6">3.6 - Error Handling in C</A>
-<LI><A HREF="manual.html#3.7">3.7 - Functions and Types</A>
-<LI><A HREF="manual.html#3.8">3.8 - The Debug Interface</A>
-</UL>
-<P>
-<LI><A HREF="manual.html#4">4 - The Auxiliary Library</A>
-<UL>
-<LI><A HREF="manual.html#4.1">4.1 - Functions and Types</A>
-</UL>
-<P>
-<LI><A HREF="manual.html#5">5 - Standard Libraries</A>
-<UL>
-<LI><A HREF="manual.html#5.1">5.1 - Basic Functions</A>
-<LI><A HREF="manual.html#5.2">5.2 - Coroutine Manipulation</A>
-<LI><A HREF="manual.html#5.3">5.3 - Modules</A>
-<LI><A HREF="manual.html#5.4">5.4 - String Manipulation</A>
-<UL>
-<LI><A HREF="manual.html#5.4.1">5.4.1 - Patterns</A>
-</UL>
-<LI><A HREF="manual.html#5.5">5.5 - Table Manipulation</A>
-<LI><A HREF="manual.html#5.6">5.6 - Mathematical Functions</A>
-<LI><A HREF="manual.html#5.7">5.7 - Input and Output Facilities</A>
-<LI><A HREF="manual.html#5.8">5.8 - Operating System Facilities</A>
-<LI><A HREF="manual.html#5.9">5.9 - The Debug Library</A>
-</UL>
-<P>
-<LI><A HREF="manual.html#6">6 - Lua Stand-alone</A>
-<P>
-<LI><A HREF="manual.html#7">7 - Incompatibilities with the Previous Version</A>
-<UL>
-<LI><A HREF="manual.html#7.1">7.1 - Changes in the Language</A>
-<LI><A HREF="manual.html#7.2">7.2 - Changes in the Libraries</A>
-<LI><A HREF="manual.html#7.3">7.3 - Changes in the API</A>
-</UL>
-<P>
-<LI><A HREF="manual.html#8">8 - The Complete Syntax of Lua</A>
-</UL>
-
-<H2><A NAME="index">Index</A></H2>
-<TABLE WIDTH="100%">
-<TR VALIGN="top">
-<TD>
-<H3><A NAME="functions">Lua functions</A></H3>
-<A HREF="manual.html#pdf-_G">_G</A><BR>
-<A HREF="manual.html#pdf-_VERSION">_VERSION</A><BR>
-<A HREF="manual.html#pdf-assert">assert</A><BR>
-<A HREF="manual.html#pdf-collectgarbage">collectgarbage</A><BR>
-<A HREF="manual.html#pdf-dofile">dofile</A><BR>
-<A HREF="manual.html#pdf-error">error</A><BR>
-<A HREF="manual.html#pdf-getfenv">getfenv</A><BR>
-<A HREF="manual.html#pdf-getmetatable">getmetatable</A><BR>
-<A HREF="manual.html#pdf-ipairs">ipairs</A><BR>
-<A HREF="manual.html#pdf-load">load</A><BR>
-<A HREF="manual.html#pdf-loadfile">loadfile</A><BR>
-<A HREF="manual.html#pdf-loadstring">loadstring</A><BR>
-<A HREF="manual.html#pdf-module">module</A><BR>
-<A HREF="manual.html#pdf-next">next</A><BR>
-<A HREF="manual.html#pdf-pairs">pairs</A><BR>
-<A HREF="manual.html#pdf-pcall">pcall</A><BR>
-<A HREF="manual.html#pdf-print">print</A><BR>
-<A HREF="manual.html#pdf-rawequal">rawequal</A><BR>
-<A HREF="manual.html#pdf-rawget">rawget</A><BR>
-<A HREF="manual.html#pdf-rawset">rawset</A><BR>
-<A HREF="manual.html#pdf-require">require</A><BR>
-<A HREF="manual.html#pdf-select">select</A><BR>
-<A HREF="manual.html#pdf-setfenv">setfenv</A><BR>
-<A HREF="manual.html#pdf-setmetatable">setmetatable</A><BR>
-<A HREF="manual.html#pdf-tonumber">tonumber</A><BR>
-<A HREF="manual.html#pdf-tostring">tostring</A><BR>
-<A HREF="manual.html#pdf-type">type</A><BR>
-<A HREF="manual.html#pdf-unpack">unpack</A><BR>
-<A HREF="manual.html#pdf-xpcall">xpcall</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-coroutine.create">coroutine.create</A><BR>
-<A HREF="manual.html#pdf-coroutine.resume">coroutine.resume</A><BR>
-<A HREF="manual.html#pdf-coroutine.running">coroutine.running</A><BR>
-<A HREF="manual.html#pdf-coroutine.status">coroutine.status</A><BR>
-<A HREF="manual.html#pdf-coroutine.wrap">coroutine.wrap</A><BR>
-<A HREF="manual.html#pdf-coroutine.yield">coroutine.yield</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-debug.debug">debug.debug</A><BR>
-<A HREF="manual.html#pdf-debug.getfenv">debug.getfenv</A><BR>
-<A HREF="manual.html#pdf-debug.gethook">debug.gethook</A><BR>
-<A HREF="manual.html#pdf-debug.getinfo">debug.getinfo</A><BR>
-<A HREF="manual.html#pdf-debug.getlocal">debug.getlocal</A><BR>
-<A HREF="manual.html#pdf-debug.getmetatable">debug.getmetatable</A><BR>
-<A HREF="manual.html#pdf-debug.getregistry">debug.getregistry</A><BR>
-<A HREF="manual.html#pdf-debug.getupvalue">debug.getupvalue</A><BR>
-<A HREF="manual.html#pdf-debug.setfenv">debug.setfenv</A><BR>
-<A HREF="manual.html#pdf-debug.sethook">debug.sethook</A><BR>
-<A HREF="manual.html#pdf-debug.setlocal">debug.setlocal</A><BR>
-<A HREF="manual.html#pdf-debug.setmetatable">debug.setmetatable</A><BR>
-<A HREF="manual.html#pdf-debug.setupvalue">debug.setupvalue</A><BR>
-<A HREF="manual.html#pdf-debug.traceback">debug.traceback</A><BR>
-
-</TD>
-<TD>
-<H3> </H3>
-<A HREF="manual.html#pdf-file:close">file:close</A><BR>
-<A HREF="manual.html#pdf-file:flush">file:flush</A><BR>
-<A HREF="manual.html#pdf-file:lines">file:lines</A><BR>
-<A HREF="manual.html#pdf-file:read">file:read</A><BR>
-<A HREF="manual.html#pdf-file:seek">file:seek</A><BR>
-<A HREF="manual.html#pdf-file:setvbuf">file:setvbuf</A><BR>
-<A HREF="manual.html#pdf-file:write">file:write</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-io.close">io.close</A><BR>
-<A HREF="manual.html#pdf-io.flush">io.flush</A><BR>
-<A HREF="manual.html#pdf-io.input">io.input</A><BR>
-<A HREF="manual.html#pdf-io.lines">io.lines</A><BR>
-<A HREF="manual.html#pdf-io.open">io.open</A><BR>
-<A HREF="manual.html#pdf-io.output">io.output</A><BR>
-<A HREF="manual.html#pdf-io.popen">io.popen</A><BR>
-<A HREF="manual.html#pdf-io.read">io.read</A><BR>
-<A HREF="manual.html#pdf-io.stderr">io.stderr</A><BR>
-<A HREF="manual.html#pdf-io.stdin">io.stdin</A><BR>
-<A HREF="manual.html#pdf-io.stdout">io.stdout</A><BR>
-<A HREF="manual.html#pdf-io.tmpfile">io.tmpfile</A><BR>
-<A HREF="manual.html#pdf-io.type">io.type</A><BR>
-<A HREF="manual.html#pdf-io.write">io.write</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-math.abs">math.abs</A><BR>
-<A HREF="manual.html#pdf-math.acos">math.acos</A><BR>
-<A HREF="manual.html#pdf-math.asin">math.asin</A><BR>
-<A HREF="manual.html#pdf-math.atan">math.atan</A><BR>
-<A HREF="manual.html#pdf-math.atan2">math.atan2</A><BR>
-<A HREF="manual.html#pdf-math.ceil">math.ceil</A><BR>
-<A HREF="manual.html#pdf-math.cos">math.cos</A><BR>
-<A HREF="manual.html#pdf-math.cosh">math.cosh</A><BR>
-<A HREF="manual.html#pdf-math.deg">math.deg</A><BR>
-<A HREF="manual.html#pdf-math.exp">math.exp</A><BR>
-<A HREF="manual.html#pdf-math.floor">math.floor</A><BR>
-<A HREF="manual.html#pdf-math.fmod">math.fmod</A><BR>
-<A HREF="manual.html#pdf-math.frexp">math.frexp</A><BR>
-<A HREF="manual.html#pdf-math.huge">math.huge</A><BR>
-<A HREF="manual.html#pdf-math.ldexp">math.ldexp</A><BR>
-<A HREF="manual.html#pdf-math.log">math.log</A><BR>
-<A HREF="manual.html#pdf-math.log10">math.log10</A><BR>
-<A HREF="manual.html#pdf-math.max">math.max</A><BR>
-<A HREF="manual.html#pdf-math.min">math.min</A><BR>
-<A HREF="manual.html#pdf-math.modf">math.modf</A><BR>
-<A HREF="manual.html#pdf-math.pi">math.pi</A><BR>
-<A HREF="manual.html#pdf-math.pow">math.pow</A><BR>
-<A HREF="manual.html#pdf-math.rad">math.rad</A><BR>
-<A HREF="manual.html#pdf-math.random">math.random</A><BR>
-<A HREF="manual.html#pdf-math.randomseed">math.randomseed</A><BR>
-<A HREF="manual.html#pdf-math.sin">math.sin</A><BR>
-<A HREF="manual.html#pdf-math.sinh">math.sinh</A><BR>
-<A HREF="manual.html#pdf-math.sqrt">math.sqrt</A><BR>
-<A HREF="manual.html#pdf-math.tan">math.tan</A><BR>
-<A HREF="manual.html#pdf-math.tanh">math.tanh</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-os.clock">os.clock</A><BR>
-<A HREF="manual.html#pdf-os.date">os.date</A><BR>
-<A HREF="manual.html#pdf-os.difftime">os.difftime</A><BR>
-<A HREF="manual.html#pdf-os.execute">os.execute</A><BR>
-<A HREF="manual.html#pdf-os.exit">os.exit</A><BR>
-<A HREF="manual.html#pdf-os.getenv">os.getenv</A><BR>
-<A HREF="manual.html#pdf-os.remove">os.remove</A><BR>
-<A HREF="manual.html#pdf-os.rename">os.rename</A><BR>
-<A HREF="manual.html#pdf-os.setlocale">os.setlocale</A><BR>
-<A HREF="manual.html#pdf-os.time">os.time</A><BR>
-<A HREF="manual.html#pdf-os.tmpname">os.tmpname</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-package.cpath">package.cpath</A><BR>
-<A HREF="manual.html#pdf-package.loaded">package.loaded</A><BR>
-<A HREF="manual.html#pdf-package.loaders">package.loaders</A><BR>
-<A HREF="manual.html#pdf-package.loadlib">package.loadlib</A><BR>
-<A HREF="manual.html#pdf-package.path">package.path</A><BR>
-<A HREF="manual.html#pdf-package.preload">package.preload</A><BR>
-<A HREF="manual.html#pdf-package.seeall">package.seeall</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-string.byte">string.byte</A><BR>
-<A HREF="manual.html#pdf-string.char">string.char</A><BR>
-<A HREF="manual.html#pdf-string.dump">string.dump</A><BR>
-<A HREF="manual.html#pdf-string.find">string.find</A><BR>
-<A HREF="manual.html#pdf-string.format">string.format</A><BR>
-<A HREF="manual.html#pdf-string.gmatch">string.gmatch</A><BR>
-<A HREF="manual.html#pdf-string.gsub">string.gsub</A><BR>
-<A HREF="manual.html#pdf-string.len">string.len</A><BR>
-<A HREF="manual.html#pdf-string.lower">string.lower</A><BR>
-<A HREF="manual.html#pdf-string.match">string.match</A><BR>
-<A HREF="manual.html#pdf-string.rep">string.rep</A><BR>
-<A HREF="manual.html#pdf-string.reverse">string.reverse</A><BR>
-<A HREF="manual.html#pdf-string.sub">string.sub</A><BR>
-<A HREF="manual.html#pdf-string.upper">string.upper</A><BR>
-<P>
-
-<A HREF="manual.html#pdf-table.concat">table.concat</A><BR>
-<A HREF="manual.html#pdf-table.insert">table.insert</A><BR>
-<A HREF="manual.html#pdf-table.maxn">table.maxn</A><BR>
-<A HREF="manual.html#pdf-table.remove">table.remove</A><BR>
-<A HREF="manual.html#pdf-table.sort">table.sort</A><BR>
-
-</TD>
-<TD>
-<H3>C API</H3>
-<A HREF="manual.html#lua_Alloc">lua_Alloc</A><BR>
-<A HREF="manual.html#lua_CFunction">lua_CFunction</A><BR>
-<A HREF="manual.html#lua_Debug">lua_Debug</A><BR>
-<A HREF="manual.html#lua_Hook">lua_Hook</A><BR>
-<A HREF="manual.html#lua_Integer">lua_Integer</A><BR>
-<A HREF="manual.html#lua_Number">lua_Number</A><BR>
-<A HREF="manual.html#lua_Reader">lua_Reader</A><BR>
-<A HREF="manual.html#lua_State">lua_State</A><BR>
-<A HREF="manual.html#lua_Writer">lua_Writer</A><BR>
-<P>
-
-<A HREF="manual.html#lua_atpanic">lua_atpanic</A><BR>
-<A HREF="manual.html#lua_call">lua_call</A><BR>
-<A HREF="manual.html#lua_checkstack">lua_checkstack</A><BR>
-<A HREF="manual.html#lua_close">lua_close</A><BR>
-<A HREF="manual.html#lua_concat">lua_concat</A><BR>
-<A HREF="manual.html#lua_cpcall">lua_cpcall</A><BR>
-<A HREF="manual.html#lua_createtable">lua_createtable</A><BR>
-<A HREF="manual.html#lua_dump">lua_dump</A><BR>
-<A HREF="manual.html#lua_equal">lua_equal</A><BR>
-<A HREF="manual.html#lua_error">lua_error</A><BR>
-<A HREF="manual.html#lua_gc">lua_gc</A><BR>
-<A HREF="manual.html#lua_getallocf">lua_getallocf</A><BR>
-<A HREF="manual.html#lua_getfenv">lua_getfenv</A><BR>
-<A HREF="manual.html#lua_getfield">lua_getfield</A><BR>
-<A HREF="manual.html#lua_getglobal">lua_getglobal</A><BR>
-<A HREF="manual.html#lua_gethook">lua_gethook</A><BR>
-<A HREF="manual.html#lua_gethookcount">lua_gethookcount</A><BR>
-<A HREF="manual.html#lua_gethookmask">lua_gethookmask</A><BR>
-<A HREF="manual.html#lua_getinfo">lua_getinfo</A><BR>
-<A HREF="manual.html#lua_getlocal">lua_getlocal</A><BR>
-<A HREF="manual.html#lua_getmetatable">lua_getmetatable</A><BR>
-<A HREF="manual.html#lua_getstack">lua_getstack</A><BR>
-<A HREF="manual.html#lua_gettable">lua_gettable</A><BR>
-<A HREF="manual.html#lua_gettop">lua_gettop</A><BR>
-<A HREF="manual.html#lua_getupvalue">lua_getupvalue</A><BR>
-<A HREF="manual.html#lua_insert">lua_insert</A><BR>
-<A HREF="manual.html#lua_isboolean">lua_isboolean</A><BR>
-<A HREF="manual.html#lua_iscfunction">lua_iscfunction</A><BR>
-<A HREF="manual.html#lua_isfunction">lua_isfunction</A><BR>
-<A HREF="manual.html#lua_islightuserdata">lua_islightuserdata</A><BR>
-<A HREF="manual.html#lua_isnil">lua_isnil</A><BR>
-<A HREF="manual.html#lua_isnone">lua_isnone</A><BR>
-<A HREF="manual.html#lua_isnoneornil">lua_isnoneornil</A><BR>
-<A HREF="manual.html#lua_isnumber">lua_isnumber</A><BR>
-<A HREF="manual.html#lua_isstring">lua_isstring</A><BR>
-<A HREF="manual.html#lua_istable">lua_istable</A><BR>
-<A HREF="manual.html#lua_isthread">lua_isthread</A><BR>
-<A HREF="manual.html#lua_isuserdata">lua_isuserdata</A><BR>
-<A HREF="manual.html#lua_lessthan">lua_lessthan</A><BR>
-<A HREF="manual.html#lua_load">lua_load</A><BR>
-<A HREF="manual.html#lua_newstate">lua_newstate</A><BR>
-<A HREF="manual.html#lua_newtable">lua_newtable</A><BR>
-<A HREF="manual.html#lua_newthread">lua_newthread</A><BR>
-<A HREF="manual.html#lua_newuserdata">lua_newuserdata</A><BR>
-<A HREF="manual.html#lua_next">lua_next</A><BR>
-<A HREF="manual.html#lua_objlen">lua_objlen</A><BR>
-<A HREF="manual.html#lua_pcall">lua_pcall</A><BR>
-<A HREF="manual.html#lua_pop">lua_pop</A><BR>
-<A HREF="manual.html#lua_pushboolean">lua_pushboolean</A><BR>
-<A HREF="manual.html#lua_pushcclosure">lua_pushcclosure</A><BR>
-<A HREF="manual.html#lua_pushcfunction">lua_pushcfunction</A><BR>
-<A HREF="manual.html#lua_pushfstring">lua_pushfstring</A><BR>
-<A HREF="manual.html#lua_pushinteger">lua_pushinteger</A><BR>
-<A HREF="manual.html#lua_pushlightuserdata">lua_pushlightuserdata</A><BR>
-<A HREF="manual.html#lua_pushliteral">lua_pushliteral</A><BR>
-<A HREF="manual.html#lua_pushlstring">lua_pushlstring</A><BR>
-<A HREF="manual.html#lua_pushnil">lua_pushnil</A><BR>
-<A HREF="manual.html#lua_pushnumber">lua_pushnumber</A><BR>
-<A HREF="manual.html#lua_pushstring">lua_pushstring</A><BR>
-<A HREF="manual.html#lua_pushthread">lua_pushthread</A><BR>
-<A HREF="manual.html#lua_pushvalue">lua_pushvalue</A><BR>
-<A HREF="manual.html#lua_pushvfstring">lua_pushvfstring</A><BR>
-<A HREF="manual.html#lua_rawequal">lua_rawequal</A><BR>
-<A HREF="manual.html#lua_rawget">lua_rawget</A><BR>
-<A HREF="manual.html#lua_rawgeti">lua_rawgeti</A><BR>
-<A HREF="manual.html#lua_rawset">lua_rawset</A><BR>
-<A HREF="manual.html#lua_rawseti">lua_rawseti</A><BR>
-<A HREF="manual.html#lua_register">lua_register</A><BR>
-<A HREF="manual.html#lua_remove">lua_remove</A><BR>
-<A HREF="manual.html#lua_replace">lua_replace</A><BR>
-<A HREF="manual.html#lua_resume">lua_resume</A><BR>
-<A HREF="manual.html#lua_setallocf">lua_setallocf</A><BR>
-<A HREF="manual.html#lua_setfenv">lua_setfenv</A><BR>
-<A HREF="manual.html#lua_setfield">lua_setfield</A><BR>
-<A HREF="manual.html#lua_setglobal">lua_setglobal</A><BR>
-<A HREF="manual.html#lua_sethook">lua_sethook</A><BR>
-<A HREF="manual.html#lua_setlocal">lua_setlocal</A><BR>
-<A HREF="manual.html#lua_setmetatable">lua_setmetatable</A><BR>
-<A HREF="manual.html#lua_settable">lua_settable</A><BR>
-<A HREF="manual.html#lua_settop">lua_settop</A><BR>
-<A HREF="manual.html#lua_setupvalue">lua_setupvalue</A><BR>
-<A HREF="manual.html#lua_status">lua_status</A><BR>
-<A HREF="manual.html#lua_toboolean">lua_toboolean</A><BR>
-<A HREF="manual.html#lua_tocfunction">lua_tocfunction</A><BR>
-<A HREF="manual.html#lua_tointeger">lua_tointeger</A><BR>
-<A HREF="manual.html#lua_tolstring">lua_tolstring</A><BR>
-<A HREF="manual.html#lua_tonumber">lua_tonumber</A><BR>
-<A HREF="manual.html#lua_topointer">lua_topointer</A><BR>
-<A HREF="manual.html#lua_tostring">lua_tostring</A><BR>
-<A HREF="manual.html#lua_tothread">lua_tothread</A><BR>
-<A HREF="manual.html#lua_touserdata">lua_touserdata</A><BR>
-<A HREF="manual.html#lua_type">lua_type</A><BR>
-<A HREF="manual.html#lua_typename">lua_typename</A><BR>
-<A HREF="manual.html#lua_upvalueindex">lua_upvalueindex</A><BR>
-<A HREF="manual.html#lua_xmove">lua_xmove</A><BR>
-<A HREF="manual.html#lua_yield">lua_yield</A><BR>
-
-</TD>
-<TD>
-<H3>auxiliary library</H3>
-<A HREF="manual.html#luaL_Buffer">luaL_Buffer</A><BR>
-<A HREF="manual.html#luaL_Reg">luaL_Reg</A><BR>
-<P>
-
-<A HREF="manual.html#luaL_addchar">luaL_addchar</A><BR>
-<A HREF="manual.html#luaL_addlstring">luaL_addlstring</A><BR>
-<A HREF="manual.html#luaL_addsize">luaL_addsize</A><BR>
-<A HREF="manual.html#luaL_addstring">luaL_addstring</A><BR>
-<A HREF="manual.html#luaL_addvalue">luaL_addvalue</A><BR>
-<A HREF="manual.html#luaL_argcheck">luaL_argcheck</A><BR>
-<A HREF="manual.html#luaL_argerror">luaL_argerror</A><BR>
-<A HREF="manual.html#luaL_buffinit">luaL_buffinit</A><BR>
-<A HREF="manual.html#luaL_callmeta">luaL_callmeta</A><BR>
-<A HREF="manual.html#luaL_checkany">luaL_checkany</A><BR>
-<A HREF="manual.html#luaL_checkint">luaL_checkint</A><BR>
-<A HREF="manual.html#luaL_checkinteger">luaL_checkinteger</A><BR>
-<A HREF="manual.html#luaL_checklong">luaL_checklong</A><BR>
-<A HREF="manual.html#luaL_checklstring">luaL_checklstring</A><BR>
-<A HREF="manual.html#luaL_checknumber">luaL_checknumber</A><BR>
-<A HREF="manual.html#luaL_checkoption">luaL_checkoption</A><BR>
-<A HREF="manual.html#luaL_checkstack">luaL_checkstack</A><BR>
-<A HREF="manual.html#luaL_checkstring">luaL_checkstring</A><BR>
-<A HREF="manual.html#luaL_checktype">luaL_checktype</A><BR>
-<A HREF="manual.html#luaL_checkudata">luaL_checkudata</A><BR>
-<A HREF="manual.html#luaL_dofile">luaL_dofile</A><BR>
-<A HREF="manual.html#luaL_dostring">luaL_dostring</A><BR>
-<A HREF="manual.html#luaL_error">luaL_error</A><BR>
-<A HREF="manual.html#luaL_getmetafield">luaL_getmetafield</A><BR>
-<A HREF="manual.html#luaL_getmetatable">luaL_getmetatable</A><BR>
-<A HREF="manual.html#luaL_gsub">luaL_gsub</A><BR>
-<A HREF="manual.html#luaL_loadbuffer">luaL_loadbuffer</A><BR>
-<A HREF="manual.html#luaL_loadfile">luaL_loadfile</A><BR>
-<A HREF="manual.html#luaL_loadstring">luaL_loadstring</A><BR>
-<A HREF="manual.html#luaL_newmetatable">luaL_newmetatable</A><BR>
-<A HREF="manual.html#luaL_newstate">luaL_newstate</A><BR>
-<A HREF="manual.html#luaL_openlibs">luaL_openlibs</A><BR>
-<A HREF="manual.html#luaL_optint">luaL_optint</A><BR>
-<A HREF="manual.html#luaL_optinteger">luaL_optinteger</A><BR>
-<A HREF="manual.html#luaL_optlong">luaL_optlong</A><BR>
-<A HREF="manual.html#luaL_optlstring">luaL_optlstring</A><BR>
-<A HREF="manual.html#luaL_optnumber">luaL_optnumber</A><BR>
-<A HREF="manual.html#luaL_optstring">luaL_optstring</A><BR>
-<A HREF="manual.html#luaL_prepbuffer">luaL_prepbuffer</A><BR>
-<A HREF="manual.html#luaL_pushresult">luaL_pushresult</A><BR>
-<A HREF="manual.html#luaL_ref">luaL_ref</A><BR>
-<A HREF="manual.html#luaL_register">luaL_register</A><BR>
-<A HREF="manual.html#luaL_typename">luaL_typename</A><BR>
-<A HREF="manual.html#luaL_typerror">luaL_typerror</A><BR>
-<A HREF="manual.html#luaL_unref">luaL_unref</A><BR>
-<A HREF="manual.html#luaL_where">luaL_where</A><BR>
-
-</TD>
-</TR>
-</TABLE>
-<P>
-
-<HR>
-<SMALL>
-Last update:
-Sat Jan 19 13:24:29 BRST 2008
-</SMALL>
-<!--
-Last change: revised for Lua 5.1.3
--->
-
-</BODY>
-</HTML>
+++ /dev/null
-body {
- color: #000000 ;
- background-color: #FFFFFF ;
- font-family: sans-serif ;
- text-align: justify ;
- margin-right: 20px ;
- margin-left: 20px ;
-}
-
-h1, h2, h3, h4 {
- font-weight: normal ;
- font-style: italic ;
-}
-
-a:link {
- color: #000080 ;
- background-color: inherit ;
- text-decoration: none ;
-}
-
-a:visited {
- background-color: inherit ;
- text-decoration: none ;
-}
-
-a:link:hover, a:visited:hover {
- color: #000080 ;
- background-color: #E0E0FF ;
-}
-
-a:link:active, a:visited:active {
- color: #FF0000 ;
-}
-
-hr {
- border: 0 ;
- height: 1px ;
- color: #a0a0a0 ;
- background-color: #a0a0a0 ;
-}
+++ /dev/null
-<!-- $Id: lua.man,v 1.11 2006/01/06 16:03:34 lhf Exp $ -->
-<HTML>
-<HEAD>
-<TITLE>LUA man page</TITLE>
-<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
-</HEAD>
-
-<BODY BGCOLOR="#FFFFFF">
-
-<H2>NAME</H2>
-lua - Lua interpreter
-<H2>SYNOPSIS</H2>
-<B>lua</B>
-[
-<I>options</I>
-]
-[
-<I>script</I>
-[
-<I>args</I>
-]
-]
-<H2>DESCRIPTION</H2>
-<B>lua</B>
-is the stand-alone Lua interpreter.
-It loads and executes Lua programs,
-either in textual source form or
-in precompiled binary form.
-(Precompiled binaries are output by
-<B>luac</B>,
-the Lua compiler.)
-<B>lua</B>
-can be used as a batch interpreter and also interactively.
-<P>
-The given
-<I>options</I>
-(see below)
-are executed and then
-the Lua program in file
-<I>script</I>
-is loaded and executed.
-The given
-<I>args</I>
-are available to
-<I>script</I>
-as strings in a global table named
-<B>arg</B>.
-If these arguments contain spaces or other characters special to the shell,
-then they should be quoted
-(but note that the quotes will be removed by the shell).
-The arguments in
-<B>arg</B>
-start at 0,
-which contains the string
-'<I>script</I>'.
-The index of the last argument is stored in
-<B>arg.n</B>.
-The arguments given in the command line before
-<I>script</I>,
-including the name of the interpreter,
-are available in negative indices in
-<B>arg</B>.
-<P>
-At the very start,
-before even handling the command line,
-<B>lua</B>
-executes the contents of the environment variable
-<B>LUA_INIT</B>,
-if it is defined.
-If the value of
-<B>LUA_INIT</B>
-is of the form
-'@<I>filename</I>',
-then
-<I>filename</I>
-is executed.
-Otherwise, the string is assumed to be a Lua statement and is executed.
-<P>
-Options start with
-<B>'-'</B>
-and are described below.
-You can use
-<B>'--'</B>
-to signal the end of options.
-<P>
-If no arguments are given,
-then
-<B>"-v -i"</B>
-is assumed when the standard input is a terminal;
-otherwise,
-<B>"-"</B>
-is assumed.
-<P>
-In interactive mode,
-<B>lua</B>
-prompts the user,
-reads lines from the standard input,
-and executes them as they are read.
-If a line does not contain a complete statement,
-then a secondary prompt is displayed and
-lines are read until a complete statement is formed or
-a syntax error is found.
-So, one way to interrupt the reading of an incomplete statement is
-to force a syntax error:
-adding a
-<B>';'</B>
-in the middle of a statement is a sure way of forcing a syntax error
-(except inside multiline strings and comments; these must be closed explicitly).
-If a line starts with
-<B>'='</B>,
-then
-<B>lua</B>
-displays the values of all the expressions in the remainder of the
-line. The expressions must be separated by commas.
-The primary prompt is the value of the global variable
-<B>_PROMPT</B>,
-if this value is a string;
-otherwise, the default prompt is used.
-Similarly, the secondary prompt is the value of the global variable
-<B>_PROMPT2</B>.
-So,
-to change the prompts,
-set the corresponding variable to a string of your choice.
-You can do that after calling the interpreter
-or on the command line
-(but in this case you have to be careful with quotes
-if the prompt string contains a space; otherwise you may confuse the shell.)
-The default prompts are "> " and ">> ".
-<H2>OPTIONS</H2>
-<P>
-<B>-</B>
-load and execute the standard input as a file,
-that is,
-not interactively,
-even when the standard input is a terminal.
-<P>
-<B>-e </B><I>stat</I>
-execute statement
-<I>stat</I>.
-You need to quote
-<I>stat </I>
-if it contains spaces, quotes,
-or other characters special to the shell.
-<P>
-<B>-i</B>
-enter interactive mode after
-<I>script</I>
-is executed.
-<P>
-<B>-l </B><I>name</I>
-call
-<B>require</B>('<I>name</I>')
-before executing
-<I>script</I>.
-Typically used to load libraries.
-<P>
-<B>-v</B>
-show version information.
-<H2>SEE ALSO</H2>
-<B>luac</B>(1)
-<BR>
-<A HREF="http://www.lua.org/">http://www.lua.org/</A>
-<H2>DIAGNOSTICS</H2>
-Error messages should be self explanatory.
-<H2>AUTHORS</H2>
-R. Ierusalimschy,
-L. H. de Figueiredo,
-and
-W. Celes
-<!-- EOF -->
-</BODY>
-</HTML>
+++ /dev/null
-<!-- $Id: luac.man,v 1.28 2006/01/06 16:03:34 lhf Exp $ -->
-<HTML>
-<HEAD>
-<TITLE>LUAC man page</TITLE>
-<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
-</HEAD>
-
-<BODY BGCOLOR="#FFFFFF">
-
-<H2>NAME</H2>
-luac - Lua compiler
-<H2>SYNOPSIS</H2>
-<B>luac</B>
-[
-<I>options</I>
-] [
-<I>filenames</I>
-]
-<H2>DESCRIPTION</H2>
-<B>luac</B>
-is the Lua compiler.
-It translates programs written in the Lua programming language
-into binary files that can be later loaded and executed.
-<P>
-The main advantages of precompiling chunks are:
-faster loading,
-protecting source code from accidental user changes,
-and
-off-line syntax checking.
-<P>
-Precompiling does not imply faster execution
-because in Lua chunks are always compiled into bytecodes before being executed.
-<B>luac</B>
-simply allows those bytecodes to be saved in a file for later execution.
-<P>
-Precompiled chunks are not necessarily smaller than the corresponding source.
-The main goal in precompiling is faster loading.
-<P>
-The binary files created by
-<B>luac</B>
-are portable only among architectures with the same word size and byte order.
-<P>
-<B>luac</B>
-produces a single output file containing the bytecodes
-for all source files given.
-By default,
-the output file is named
-<B>luac.out</B>,
-but you can change this with the
-<B>-o</B>
-option.
-<P>
-In the command line,
-you can mix
-text files containing Lua source and
-binary files containing precompiled chunks.
-This is useful because several precompiled chunks,
-even from different (but compatible) platforms,
-can be combined into a single precompiled chunk.
-<P>
-You can use
-<B>'-'</B>
-to indicate the standard input as a source file
-and
-<B>'--'</B>
-to signal the end of options
-(that is,
-all remaining arguments will be treated as files even if they start with
-<B>'-'</B>).
-<P>
-The internal format of the binary files produced by
-<B>luac</B>
-is likely to change when a new version of Lua is released.
-So,
-save the source files of all Lua programs that you precompile.
-<P>
-<H2>OPTIONS</H2>
-Options must be separate.
-<P>
-<B>-l</B>
-produce a listing of the compiled bytecode for Lua's virtual machine.
-Listing bytecodes is useful to learn about Lua's virtual machine.
-If no files are given, then
-<B>luac</B>
-loads
-<B>luac.out</B>
-and lists its contents.
-<P>
-<B>-o </B><I>file</I>
-output to
-<I>file</I>,
-instead of the default
-<B>luac.out</B>.
-(You can use
-<B>'-'</B>
-for standard output,
-but not on platforms that open standard output in text mode.)
-The output file may be a source file because
-all files are loaded before the output file is written.
-Be careful not to overwrite precious files.
-<P>
-<B>-p</B>
-load files but do not generate any output file.
-Used mainly for syntax checking and for testing precompiled chunks:
-corrupted files will probably generate errors when loaded.
-Lua always performs a thorough integrity test on precompiled chunks.
-Bytecode that passes this test is completely safe,
-in the sense that it will not break the interpreter.
-However,
-there is no guarantee that such code does anything sensible.
-(None can be given, because the halting problem is unsolvable.)
-If no files are given, then
-<B>luac</B>
-loads
-<B>luac.out</B>
-and tests its contents.
-No messages are displayed if the file passes the integrity test.
-<P>
-<B>-s</B>
-strip debug information before writing the output file.
-This saves some space in very large chunks,
-but if errors occur when running a stripped chunk,
-then the error messages may not contain the full information they usually do.
-For instance,
-line numbers and names of local variables are lost.
-<P>
-<B>-v</B>
-show version information.
-<H2>FILES</H2>
-<P>
-<B>luac.out</B>
-default output file
-<H2>SEE ALSO</H2>
-<B>lua</B>(1)
-<BR>
-<A HREF="http://www.lua.org/">http://www.lua.org/</A>
-<H2>DIAGNOSTICS</H2>
-Error messages should be self explanatory.
-<H2>AUTHORS</H2>
-L. H. de Figueiredo,
-R. Ierusalimschy and
-W. Celes
-<!-- EOF -->
-</BODY>
-</HTML>
+++ /dev/null
-h3 code {
- font-family: inherit ;
-}
-
-pre {
- font-size: 105% ;
-}
-
-span.apii {
- float: right ;
- font-family: inherit ;
-}
+++ /dev/null
-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-
-<head>
-<title>Lua 5.1 Reference Manual</title>
-<link rel="stylesheet" type="text/css" href="lua.css">
-<link rel="stylesheet" type="text/css" href="manual.css">
-<META HTTP-EQUIV="content-type" CONTENT="text/html; charset=iso-8859-1">
-</head>
-
-<body>
-
-<hr>
-<h1>
-<a href="http://www.lua.org/"><img src="logo.gif" alt="" border="0"></a>
-Lua 5.1 Reference Manual
-</h1>
-
-by Roberto Ierusalimschy, Luiz Henrique de Figueiredo, Waldemar Celes
-<p>
-<small>
-Copyright © 2006-2008 Lua.org, PUC-Rio.
-Freely available under the terms of the
-<a href="http://www.lua.org/license.html#5">Lua license</a>.
-</small>
-<hr>
-<p>
-
-<a href="contents.html#contents">contents</A>
-·
-<a href="contents.html#index">index</A>
-
-<!-- ====================================================================== -->
-<p>
-
-<!-- $Id: manual.of,v 1.48 2008/08/18 15:24:20 roberto Exp $ -->
-
-
-
-
-<h1>1 - <a name="1">Introduction</a></h1>
-
-<p>
-Lua is an extension programming language designed to support
-general procedural programming with data description
-facilities.
-It also offers good support for object-oriented programming,
-functional programming, and data-driven programming.
-Lua is intended to be used as a powerful, light-weight
-scripting language for any program that needs one.
-Lua is implemented as a library, written in <em>clean</em> C
-(that is, in the common subset of ANSI C and C++).
-
-
-<p>
-Being an extension language, Lua has no notion of a "main" program:
-it only works <em>embedded</em> in a host client,
-called the <em>embedding program</em> or simply the <em>host</em>.
-This host program can invoke functions to execute a piece of Lua code,
-can write and read Lua variables,
-and can register C functions to be called by Lua code.
-Through the use of C functions, Lua can be augmented to cope with
-a wide range of different domains,
-thus creating customized programming languages sharing a syntactical framework.
-The Lua distribution includes a sample host program called <code>lua</code>,
-which uses the Lua library to offer a complete, stand-alone Lua interpreter.
-
-
-<p>
-Lua is free software,
-and is provided as usual with no guarantees,
-as stated in its license.
-The implementation described in this manual is available
-at Lua's official web site, <code>www.lua.org</code>.
-
-
-<p>
-Like any other reference manual,
-this document is dry in places.
-For a discussion of the decisions behind the design of Lua,
-see the technical papers available at Lua's web site.
-For a detailed introduction to programming in Lua,
-see Roberto's book, <em>Programming in Lua (Second Edition)</em>.
-
-
-
-<h1>2 - <a name="2">The Language</a></h1>
-
-<p>
-This section describes the lexis, the syntax, and the semantics of Lua.
-In other words,
-this section describes
-which tokens are valid,
-how they can be combined,
-and what their combinations mean.
-
-
-<p>
-The language constructs will be explained using the usual extended BNF notation,
-in which
-{<em>a</em>} means 0 or more <em>a</em>'s, and
-[<em>a</em>] means an optional <em>a</em>.
-Non-terminals are shown like non-terminal,
-keywords are shown like <b>kword</b>,
-and other terminal symbols are shown like `<b>=</b>´.
-The complete syntax of Lua can be found in <a href="#8">§8</a>
-at the end of this manual.
-
-
-
-<h2>2.1 - <a name="2.1">Lexical Conventions</a></h2>
-
-<p>
-<em>Names</em>
-(also called <em>identifiers</em>)
-in Lua can be any string of letters,
-digits, and underscores,
-not beginning with a digit.
-This coincides with the definition of names in most languages.
-(The definition of letter depends on the current locale:
-any character considered alphabetic by the current locale
-can be used in an identifier.)
-Identifiers are used to name variables and table fields.
-
-
-<p>
-The following <em>keywords</em> are reserved
-and cannot be used as names:
-
-
-<pre>
- and break do else elseif
- end false for function if
- in local nil not or
- repeat return then true until while
-</pre>
-
-<p>
-Lua is a case-sensitive language:
-<code>and</code> is a reserved word, but <code>And</code> and <code>AND</code>
-are two different, valid names.
-As a convention, names starting with an underscore followed by
-uppercase letters (such as <a href="#pdf-_VERSION"><code>_VERSION</code></a>)
-are reserved for internal global variables used by Lua.
-
-
-<p>
-The following strings denote other tokens:
-
-<pre>
- + - * / % ^ #
- == ~= <= >= < > =
- ( ) { } [ ]
- ; : , . .. ...
-</pre>
-
-<p>
-<em>Literal strings</em>
-can be delimited by matching single or double quotes,
-and can contain the following C-like escape sequences:
-'<code>\a</code>' (bell),
-'<code>\b</code>' (backspace),
-'<code>\f</code>' (form feed),
-'<code>\n</code>' (newline),
-'<code>\r</code>' (carriage return),
-'<code>\t</code>' (horizontal tab),
-'<code>\v</code>' (vertical tab),
-'<code>\\</code>' (backslash),
-'<code>\"</code>' (quotation mark [double quote]),
-and '<code>\'</code>' (apostrophe [single quote]).
-Moreover, a backslash followed by a real newline
-results in a newline in the string.
-A character in a string can also be specified by its numerical value
-using the escape sequence <code>\<em>ddd</em></code>,
-where <em>ddd</em> is a sequence of up to three decimal digits.
-(Note that if a numerical escape is to be followed by a digit,
-it must be expressed using exactly three digits.)
-Strings in Lua can contain any 8-bit value, including embedded zeros,
-which can be specified as '<code>\0</code>'.
-
-
-<p>
-Literal strings can also be defined using a long format
-enclosed by <em>long brackets</em>.
-We define an <em>opening long bracket of level <em>n</em></em> as an opening
-square bracket followed by <em>n</em> equal signs followed by another
-opening square bracket.
-So, an opening long bracket of level 0 is written as <code>[[</code>,
-an opening long bracket of level 1 is written as <code>[=[</code>,
-and so on.
-A <em>closing long bracket</em> is defined similarly;
-for instance, a closing long bracket of level 4 is written as <code>]====]</code>.
-A long string starts with an opening long bracket of any level and
-ends at the first closing long bracket of the same level.
-Literals in this bracketed form can run for several lines,
-do not interpret any escape sequences,
-and ignore long brackets of any other level.
-They can contain anything except a closing bracket of the proper level.
-
-
-<p>
-For convenience,
-when the opening long bracket is immediately followed by a newline,
-the newline is not included in the string.
-As an example, in a system using ASCII
-(in which '<code>a</code>' is coded as 97,
-newline is coded as 10, and '<code>1</code>' is coded as 49),
-the five literal strings below denote the same string:
-
-<pre>
- a = 'alo\n123"'
- a = "alo\n123\""
- a = '\97lo\10\04923"'
- a = [[alo
- 123"]]
- a = [==[
- alo
- 123"]==]
-</pre>
-
-<p>
-A <em>numerical constant</em> can be written with an optional decimal part
-and an optional decimal exponent.
-Lua also accepts integer hexadecimal constants,
-by prefixing them with <code>0x</code>.
-Examples of valid numerical constants are
-
-<pre>
- 3 3.0 3.1416 314.16e-2 0.31416E1 0xff 0x56
-</pre>
-
-<p>
-A <em>comment</em> starts with a double hyphen (<code>--</code>)
-anywhere outside a string.
-If the text immediately after <code>--</code> is not an opening long bracket,
-the comment is a <em>short comment</em>,
-which runs until the end of the line.
-Otherwise, it is a <em>long comment</em>,
-which runs until the corresponding closing long bracket.
-Long comments are frequently used to disable code temporarily.
-
-
-
-
-
-<h2>2.2 - <a name="2.2">Values and Types</a></h2>
-
-<p>
-Lua is a <em>dynamically typed language</em>.
-This means that
-variables do not have types; only values do.
-There are no type definitions in the language.
-All values carry their own type.
-
-
-<p>
-All values in Lua are <em>first-class values</em>.
-This means that all values can be stored in variables,
-passed as arguments to other functions, and returned as results.
-
-
-<p>
-There are eight basic types in Lua:
-<em>nil</em>, <em>boolean</em>, <em>number</em>,
-<em>string</em>, <em>function</em>, <em>userdata</em>,
-<em>thread</em>, and <em>table</em>.
-<em>Nil</em> is the type of the value <b>nil</b>,
-whose main property is to be different from any other value;
-it usually represents the absence of a useful value.
-<em>Boolean</em> is the type of the values <b>false</b> and <b>true</b>.
-Both <b>nil</b> and <b>false</b> make a condition false;
-any other value makes it true.
-<em>Number</em> represents real (double-precision floating-point) numbers.
-(It is easy to build Lua interpreters that use other
-internal representations for numbers,
-such as single-precision float or long integers;
-see file <code>luaconf.h</code>.)
-<em>String</em> represents arrays of characters.
-
-Lua is 8-bit clean:
-strings can contain any 8-bit character,
-including embedded zeros ('<code>\0</code>') (see <a href="#2.1">§2.1</a>).
-
-
-<p>
-Lua can call (and manipulate) functions written in Lua and
-functions written in C
-(see <a href="#2.5.8">§2.5.8</a>).
-
-
-<p>
-The type <em>userdata</em> is provided to allow arbitrary C data to
-be stored in Lua variables.
-This type corresponds to a block of raw memory
-and has no pre-defined operations in Lua,
-except assignment and identity test.
-However, by using <em>metatables</em>,
-the programmer can define operations for userdata values
-(see <a href="#2.8">§2.8</a>).
-Userdata values cannot be created or modified in Lua,
-only through the C API.
-This guarantees the integrity of data owned by the host program.
-
-
-<p>
-The type <em>thread</em> represents independent threads of execution
-and it is used to implement coroutines (see <a href="#2.11">§2.11</a>).
-Do not confuse Lua threads with operating-system threads.
-Lua supports coroutines on all systems,
-even those that do not support threads.
-
-
-<p>
-The type <em>table</em> implements associative arrays,
-that is, arrays that can be indexed not only with numbers,
-but with any value (except <b>nil</b>).
-Tables can be <em>heterogeneous</em>;
-that is, they can contain values of all types (except <b>nil</b>).
-Tables are the sole data structuring mechanism in Lua;
-they can be used to represent ordinary arrays,
-symbol tables, sets, records, graphs, trees, etc.
-To represent records, Lua uses the field name as an index.
-The language supports this representation by
-providing <code>a.name</code> as syntactic sugar for <code>a["name"]</code>.
-There are several convenient ways to create tables in Lua
-(see <a href="#2.5.7">§2.5.7</a>).
-
-
-<p>
-Like indices,
-the value of a table field can be of any type (except <b>nil</b>).
-In particular,
-because functions are first-class values,
-table fields can contain functions.
-Thus tables can also carry <em>methods</em> (see <a href="#2.5.9">§2.5.9</a>).
-
-
-<p>
-Tables, functions, threads, and (full) userdata values are <em>objects</em>:
-variables do not actually <em>contain</em> these values,
-only <em>references</em> to them.
-Assignment, parameter passing, and function returns
-always manipulate references to such values;
-these operations do not imply any kind of copy.
-
-
-<p>
-The library function <a href="#pdf-type"><code>type</code></a> returns a string describing the type
-of a given value.
-
-
-
-<h3>2.2.1 - <a name="2.2.1">Coercion</a></h3>
-
-<p>
-Lua provides automatic conversion between
-string and number values at run time.
-Any arithmetic operation applied to a string tries to convert
-this string to a number, following the usual conversion rules.
-Conversely, whenever a number is used where a string is expected,
-the number is converted to a string, in a reasonable format.
-For complete control over how numbers are converted to strings,
-use the <code>format</code> function from the string library
-(see <a href="#pdf-string.format"><code>string.format</code></a>).
-
-
-
-
-
-
-
-<h2>2.3 - <a name="2.3">Variables</a></h2>
-
-<p>
-Variables are places that store values.
-
-There are three kinds of variables in Lua:
-global variables, local variables, and table fields.
-
-
-<p>
-A single name can denote a global variable or a local variable
-(or a function's formal parameter,
-which is a particular kind of local variable):
-
-<pre>
- var ::= Name
-</pre><p>
-Name denotes identifiers, as defined in <a href="#2.1">§2.1</a>.
-
-
-<p>
-Any variable is assumed to be global unless explicitly declared
-as a local (see <a href="#2.4.7">§2.4.7</a>).
-Local variables are <em>lexically scoped</em>:
-local variables can be freely accessed by functions
-defined inside their scope (see <a href="#2.6">§2.6</a>).
-
-
-<p>
-Before the first assignment to a variable, its value is <b>nil</b>.
-
-
-<p>
-Square brackets are used to index a table:
-
-<pre>
- var ::= prefixexp `<b>[</b>´ exp `<b>]</b>´
-</pre><p>
-The meaning of accesses to global variables
-and table fields can be changed via metatables.
-An access to an indexed variable <code>t[i]</code> is equivalent to
-a call <code>gettable_event(t,i)</code>.
-(See <a href="#2.8">§2.8</a> for a complete description of the
-<code>gettable_event</code> function.
-This function is not defined or callable in Lua.
-We use it here only for explanatory purposes.)
-
-
-<p>
-The syntax <code>var.Name</code> is just syntactic sugar for
-<code>var["Name"]</code>:
-
-<pre>
- var ::= prefixexp `<b>.</b>´ Name
-</pre>
-
-<p>
-All global variables live as fields in ordinary Lua tables,
-called <em>environment tables</em> or simply
-<em>environments</em> (see <a href="#2.9">§2.9</a>).
-Each function has its own reference to an environment,
-so that all global variables in this function
-will refer to this environment table.
-When a function is created,
-it inherits the environment from the function that created it.
-To get the environment table of a Lua function,
-you call <a href="#pdf-getfenv"><code>getfenv</code></a>.
-To replace it,
-you call <a href="#pdf-setfenv"><code>setfenv</code></a>.
-(You can only manipulate the environment of C functions
-through the debug library; (see <a href="#5.9">§5.9</a>).)
-
-
-<p>
-An access to a global variable <code>x</code>
-is equivalent to <code>_env.x</code>,
-which in turn is equivalent to
-
-<pre>
- gettable_event(_env, "x")
-</pre><p>
-where <code>_env</code> is the environment of the running function.
-(See <a href="#2.8">§2.8</a> for a complete description of the
-<code>gettable_event</code> function.
-This function is not defined or callable in Lua.
-Similarly, the <code>_env</code> variable is not defined in Lua.
-We use them here only for explanatory purposes.)
-
-
-
-
-
-<h2>2.4 - <a name="2.4">Statements</a></h2>
-
-<p>
-Lua supports an almost conventional set of statements,
-similar to those in Pascal or C.
-This set includes
-assignments, control structures, function calls,
-and variable declarations.
-
-
-
-<h3>2.4.1 - <a name="2.4.1">Chunks</a></h3>
-
-<p>
-The unit of execution of Lua is called a <em>chunk</em>.
-A chunk is simply a sequence of statements,
-which are executed sequentially.
-Each statement can be optionally followed by a semicolon:
-
-<pre>
- chunk ::= {stat [`<b>;</b>´]}
-</pre><p>
-There are no empty statements and thus '<code>;;</code>' is not legal.
-
-
-<p>
-Lua handles a chunk as the body of an anonymous function
-with a variable number of arguments
-(see <a href="#2.5.9">§2.5.9</a>).
-As such, chunks can define local variables,
-receive arguments, and return values.
-
-
-<p>
-A chunk can be stored in a file or in a string inside the host program.
-To execute a chunk,
-Lua first pre-compiles the chunk into instructions for a virtual machine,
-and then it executes the compiled code
-with an interpreter for the virtual machine.
-
-
-<p>
-Chunks can also be pre-compiled into binary form;
-see program <code>luac</code> for details.
-Programs in source and compiled forms are interchangeable;
-Lua automatically detects the file type and acts accordingly.
-
-
-
-
-
-
-<h3>2.4.2 - <a name="2.4.2">Blocks</a></h3><p>
-A block is a list of statements;
-syntactically, a block is the same as a chunk:
-
-<pre>
- block ::= chunk
-</pre>
-
-<p>
-A block can be explicitly delimited to produce a single statement:
-
-<pre>
- stat ::= <b>do</b> block <b>end</b>
-</pre><p>
-Explicit blocks are useful
-to control the scope of variable declarations.
-Explicit blocks are also sometimes used to
-add a <b>return</b> or <b>break</b> statement in the middle
-of another block (see <a href="#2.4.4">§2.4.4</a>).
-
-
-
-
-
-<h3>2.4.3 - <a name="2.4.3">Assignment</a></h3>
-
-<p>
-Lua allows multiple assignments.
-Therefore, the syntax for assignment
-defines a list of variables on the left side
-and a list of expressions on the right side.
-The elements in both lists are separated by commas:
-
-<pre>
- stat ::= varlist `<b>=</b>´ explist
- varlist ::= var {`<b>,</b>´ var}
- explist ::= exp {`<b>,</b>´ exp}
-</pre><p>
-Expressions are discussed in <a href="#2.5">§2.5</a>.
-
-
-<p>
-Before the assignment,
-the list of values is <em>adjusted</em> to the length of
-the list of variables.
-If there are more values than needed,
-the excess values are thrown away.
-If there are fewer values than needed,
-the list is extended with as many <b>nil</b>'s as needed.
-If the list of expressions ends with a function call,
-then all values returned by that call enter the list of values,
-before the adjustment
-(except when the call is enclosed in parentheses; see <a href="#2.5">§2.5</a>).
-
-
-<p>
-The assignment statement first evaluates all its expressions
-and only then are the assignments performed.
-Thus the code
-
-<pre>
- i = 3
- i, a[i] = i+1, 20
-</pre><p>
-sets <code>a[3]</code> to 20, without affecting <code>a[4]</code>
-because the <code>i</code> in <code>a[i]</code> is evaluated (to 3)
-before it is assigned 4.
-Similarly, the line
-
-<pre>
- x, y = y, x
-</pre><p>
-exchanges the values of <code>x</code> and <code>y</code>,
-and
-
-<pre>
- x, y, z = y, z, x
-</pre><p>
-cyclically permutes the values of <code>x</code>, <code>y</code>, and <code>z</code>.
-
-
-<p>
-The meaning of assignments to global variables
-and table fields can be changed via metatables.
-An assignment to an indexed variable <code>t[i] = val</code> is equivalent to
-<code>settable_event(t,i,val)</code>.
-(See <a href="#2.8">§2.8</a> for a complete description of the
-<code>settable_event</code> function.
-This function is not defined or callable in Lua.
-We use it here only for explanatory purposes.)
-
-
-<p>
-An assignment to a global variable <code>x = val</code>
-is equivalent to the assignment
-<code>_env.x = val</code>,
-which in turn is equivalent to
-
-<pre>
- settable_event(_env, "x", val)
-</pre><p>
-where <code>_env</code> is the environment of the running function.
-(The <code>_env</code> variable is not defined in Lua.
-We use it here only for explanatory purposes.)
-
-
-
-
-
-<h3>2.4.4 - <a name="2.4.4">Control Structures</a></h3><p>
-The control structures
-<b>if</b>, <b>while</b>, and <b>repeat</b> have the usual meaning and
-familiar syntax:
-
-
-
-
-<pre>
- stat ::= <b>while</b> exp <b>do</b> block <b>end</b>
- stat ::= <b>repeat</b> block <b>until</b> exp
- stat ::= <b>if</b> exp <b>then</b> block {<b>elseif</b> exp <b>then</b> block} [<b>else</b> block] <b>end</b>
-</pre><p>
-Lua also has a <b>for</b> statement, in two flavors (see <a href="#2.4.5">§2.4.5</a>).
-
-
-<p>
-The condition expression of a
-control structure can return any value.
-Both <b>false</b> and <b>nil</b> are considered false.
-All values different from <b>nil</b> and <b>false</b> are considered true
-(in particular, the number 0 and the empty string are also true).
-
-
-<p>
-In the <b>repeat</b>–<b>until</b> loop,
-the inner block does not end at the <b>until</b> keyword,
-but only after the condition.
-So, the condition can refer to local variables
-declared inside the loop block.
-
-
-<p>
-The <b>return</b> statement is used to return values
-from a function or a chunk (which is just a function).
-
-Functions and chunks can return more than one value,
-and so the syntax for the <b>return</b> statement is
-
-<pre>
- stat ::= <b>return</b> [explist]
-</pre>
-
-<p>
-The <b>break</b> statement is used to terminate the execution of a
-<b>while</b>, <b>repeat</b>, or <b>for</b> loop,
-skipping to the next statement after the loop:
-
-
-<pre>
- stat ::= <b>break</b>
-</pre><p>
-A <b>break</b> ends the innermost enclosing loop.
-
-
-<p>
-The <b>return</b> and <b>break</b>
-statements can only be written as the <em>last</em> statement of a block.
-If it is really necessary to <b>return</b> or <b>break</b> in the
-middle of a block,
-then an explicit inner block can be used,
-as in the idioms
-<code>do return end</code> and <code>do break end</code>,
-because now <b>return</b> and <b>break</b> are the last statements in
-their (inner) blocks.
-
-
-
-
-
-<h3>2.4.5 - <a name="2.4.5">For Statement</a></h3>
-
-<p>
-
-The <b>for</b> statement has two forms:
-one numeric and one generic.
-
-
-<p>
-The numeric <b>for</b> loop repeats a block of code while a
-control variable runs through an arithmetic progression.
-It has the following syntax:
-
-<pre>
- stat ::= <b>for</b> Name `<b>=</b>´ exp `<b>,</b>´ exp [`<b>,</b>´ exp] <b>do</b> block <b>end</b>
-</pre><p>
-The <em>block</em> is repeated for <em>name</em> starting at the value of
-the first <em>exp</em>, until it passes the second <em>exp</em> by steps of the
-third <em>exp</em>.
-More precisely, a <b>for</b> statement like
-
-<pre>
- for v = <em>e1</em>, <em>e2</em>, <em>e3</em> do <em>block</em> end
-</pre><p>
-is equivalent to the code:
-
-<pre>
- do
- local <em>var</em>, <em>limit</em>, <em>step</em> = tonumber(<em>e1</em>), tonumber(<em>e2</em>), tonumber(<em>e3</em>)
- if not (<em>var</em> and <em>limit</em> and <em>step</em>) then error() end
- while (<em>step</em> > 0 and <em>var</em> <= <em>limit</em>) or (<em>step</em> <= 0 and <em>var</em> >= <em>limit</em>) do
- local v = <em>var</em>
- <em>block</em>
- <em>var</em> = <em>var</em> + <em>step</em>
- end
- end
-</pre><p>
-Note the following:
-
-<ul>
-
-<li>
-All three control expressions are evaluated only once,
-before the loop starts.
-They must all result in numbers.
-</li>
-
-<li>
-<code><em>var</em></code>, <code><em>limit</em></code>, and <code><em>step</em></code> are invisible variables.
-The names shown here are for explanatory purposes only.
-</li>
-
-<li>
-If the third expression (the step) is absent,
-then a step of 1 is used.
-</li>
-
-<li>
-You can use <b>break</b> to exit a <b>for</b> loop.
-</li>
-
-<li>
-The loop variable <code>v</code> is local to the loop;
-you cannot use its value after the <b>for</b> ends or is broken.
-If you need this value,
-assign it to another variable before breaking or exiting the loop.
-</li>
-
-</ul>
-
-<p>
-The generic <b>for</b> statement works over functions,
-called <em>iterators</em>.
-On each iteration, the iterator function is called to produce a new value,
-stopping when this new value is <b>nil</b>.
-The generic <b>for</b> loop has the following syntax:
-
-<pre>
- stat ::= <b>for</b> namelist <b>in</b> explist <b>do</b> block <b>end</b>
- namelist ::= Name {`<b>,</b>´ Name}
-</pre><p>
-A <b>for</b> statement like
-
-<pre>
- for <em>var_1</em>, ···, <em>var_n</em> in <em>explist</em> do <em>block</em> end
-</pre><p>
-is equivalent to the code:
-
-<pre>
- do
- local <em>f</em>, <em>s</em>, <em>var</em> = <em>explist</em>
- while true do
- local <em>var_1</em>, ···, <em>var_n</em> = <em>f</em>(<em>s</em>, <em>var</em>)
- <em>var</em> = <em>var_1</em>
- if <em>var</em> == nil then break end
- <em>block</em>
- end
- end
-</pre><p>
-Note the following:
-
-<ul>
-
-<li>
-<code><em>explist</em></code> is evaluated only once.
-Its results are an <em>iterator</em> function,
-a <em>state</em>,
-and an initial value for the first <em>iterator variable</em>.
-</li>
-
-<li>
-<code><em>f</em></code>, <code><em>s</em></code>, and <code><em>var</em></code> are invisible variables.
-The names are here for explanatory purposes only.
-</li>
-
-<li>
-You can use <b>break</b> to exit a <b>for</b> loop.
-</li>
-
-<li>
-The loop variables <code><em>var_i</em></code> are local to the loop;
-you cannot use their values after the <b>for</b> ends.
-If you need these values,
-then assign them to other variables before breaking or exiting the loop.
-</li>
-
-</ul>
-
-
-
-
-<h3>2.4.6 - <a name="2.4.6">Function Calls as Statements</a></h3><p>
-To allow possible side-effects,
-function calls can be executed as statements:
-
-<pre>
- stat ::= functioncall
-</pre><p>
-In this case, all returned values are thrown away.
-Function calls are explained in <a href="#2.5.8">§2.5.8</a>.
-
-
-
-
-
-<h3>2.4.7 - <a name="2.4.7">Local Declarations</a></h3><p>
-Local variables can be declared anywhere inside a block.
-The declaration can include an initial assignment:
-
-<pre>
- stat ::= <b>local</b> namelist [`<b>=</b>´ explist]
-</pre><p>
-If present, an initial assignment has the same semantics
-of a multiple assignment (see <a href="#2.4.3">§2.4.3</a>).
-Otherwise, all variables are initialized with <b>nil</b>.
-
-
-<p>
-A chunk is also a block (see <a href="#2.4.1">§2.4.1</a>),
-and so local variables can be declared in a chunk outside any explicit block.
-The scope of such local variables extends until the end of the chunk.
-
-
-<p>
-The visibility rules for local variables are explained in <a href="#2.6">§2.6</a>.
-
-
-
-
-
-
-
-<h2>2.5 - <a name="2.5">Expressions</a></h2>
-
-<p>
-The basic expressions in Lua are the following:
-
-<pre>
- exp ::= prefixexp
- exp ::= <b>nil</b> | <b>false</b> | <b>true</b>
- exp ::= Number
- exp ::= String
- exp ::= function
- exp ::= tableconstructor
- exp ::= `<b>...</b>´
- exp ::= exp binop exp
- exp ::= unop exp
- prefixexp ::= var | functioncall | `<b>(</b>´ exp `<b>)</b>´
-</pre>
-
-<p>
-Numbers and literal strings are explained in <a href="#2.1">§2.1</a>;
-variables are explained in <a href="#2.3">§2.3</a>;
-function definitions are explained in <a href="#2.5.9">§2.5.9</a>;
-function calls are explained in <a href="#2.5.8">§2.5.8</a>;
-table constructors are explained in <a href="#2.5.7">§2.5.7</a>.
-Vararg expressions,
-denoted by three dots ('<code>...</code>'), can only be used when
-directly inside a vararg function;
-they are explained in <a href="#2.5.9">§2.5.9</a>.
-
-
-<p>
-Binary operators comprise arithmetic operators (see <a href="#2.5.1">§2.5.1</a>),
-relational operators (see <a href="#2.5.2">§2.5.2</a>), logical operators (see <a href="#2.5.3">§2.5.3</a>),
-and the concatenation operator (see <a href="#2.5.4">§2.5.4</a>).
-Unary operators comprise the unary minus (see <a href="#2.5.1">§2.5.1</a>),
-the unary <b>not</b> (see <a href="#2.5.3">§2.5.3</a>),
-and the unary <em>length operator</em> (see <a href="#2.5.5">§2.5.5</a>).
-
-
-<p>
-Both function calls and vararg expressions can result in multiple values.
-If an expression is used as a statement
-(only possible for function calls (see <a href="#2.4.6">§2.4.6</a>)),
-then its return list is adjusted to zero elements,
-thus discarding all returned values.
-If an expression is used as the last (or the only) element
-of a list of expressions,
-then no adjustment is made
-(unless the call is enclosed in parentheses).
-In all other contexts,
-Lua adjusts the result list to one element,
-discarding all values except the first one.
-
-
-<p>
-Here are some examples:
-
-<pre>
- f() -- adjusted to 0 results
- g(f(), x) -- f() is adjusted to 1 result
- g(x, f()) -- g gets x plus all results from f()
- a,b,c = f(), x -- f() is adjusted to 1 result (c gets nil)
- a,b = ... -- a gets the first vararg parameter, b gets
- -- the second (both a and b can get nil if there
- -- is no corresponding vararg parameter)
-
- a,b,c = x, f() -- f() is adjusted to 2 results
- a,b,c = f() -- f() is adjusted to 3 results
- return f() -- returns all results from f()
- return ... -- returns all received vararg parameters
- return x,y,f() -- returns x, y, and all results from f()
- {f()} -- creates a list with all results from f()
- {...} -- creates a list with all vararg parameters
- {f(), nil} -- f() is adjusted to 1 result
-</pre>
-
-<p>
-Any expression enclosed in parentheses always results in only one value.
-Thus,
-<code>(f(x,y,z))</code> is always a single value,
-even if <code>f</code> returns several values.
-(The value of <code>(f(x,y,z))</code> is the first value returned by <code>f</code>
-or <b>nil</b> if <code>f</code> does not return any values.)
-
-
-
-<h3>2.5.1 - <a name="2.5.1">Arithmetic Operators</a></h3><p>
-Lua supports the usual arithmetic operators:
-the binary <code>+</code> (addition),
-<code>-</code> (subtraction), <code>*</code> (multiplication),
-<code>/</code> (division), <code>%</code> (modulo), and <code>^</code> (exponentiation);
-and unary <code>-</code> (negation).
-If the operands are numbers, or strings that can be converted to
-numbers (see <a href="#2.2.1">§2.2.1</a>),
-then all operations have the usual meaning.
-Exponentiation works for any exponent.
-For instance, <code>x^(-0.5)</code> computes the inverse of the square root of <code>x</code>.
-Modulo is defined as
-
-<pre>
- a % b == a - math.floor(a/b)*b
-</pre><p>
-That is, it is the remainder of a division that rounds
-the quotient towards minus infinity.
-
-
-
-
-
-<h3>2.5.2 - <a name="2.5.2">Relational Operators</a></h3><p>
-The relational operators in Lua are
-
-<pre>
- == ~= < > <= >=
-</pre><p>
-These operators always result in <b>false</b> or <b>true</b>.
-
-
-<p>
-Equality (<code>==</code>) first compares the type of its operands.
-If the types are different, then the result is <b>false</b>.
-Otherwise, the values of the operands are compared.
-Numbers and strings are compared in the usual way.
-Objects (tables, userdata, threads, and functions)
-are compared by <em>reference</em>:
-two objects are considered equal only if they are the <em>same</em> object.
-Every time you create a new object
-(a table, userdata, thread, or function),
-this new object is different from any previously existing object.
-
-
-<p>
-You can change the way that Lua compares tables and userdata
-by using the "eq" metamethod (see <a href="#2.8">§2.8</a>).
-
-
-<p>
-The conversion rules of <a href="#2.2.1">§2.2.1</a>
-<em>do not</em> apply to equality comparisons.
-Thus, <code>"0"==0</code> evaluates to <b>false</b>,
-and <code>t[0]</code> and <code>t["0"]</code> denote different
-entries in a table.
-
-
-<p>
-The operator <code>~=</code> is exactly the negation of equality (<code>==</code>).
-
-
-<p>
-The order operators work as follows.
-If both arguments are numbers, then they are compared as such.
-Otherwise, if both arguments are strings,
-then their values are compared according to the current locale.
-Otherwise, Lua tries to call the "lt" or the "le"
-metamethod (see <a href="#2.8">§2.8</a>).
-A comparison <code>a > b</code> is translated to <code>b < a</code>
-and <code>a >= b</code> is translated to <code>b <= a</code>.
-
-
-
-
-
-<h3>2.5.3 - <a name="2.5.3">Logical Operators</a></h3><p>
-The logical operators in Lua are
-<b>and</b>, <b>or</b>, and <b>not</b>.
-Like the control structures (see <a href="#2.4.4">§2.4.4</a>),
-all logical operators consider both <b>false</b> and <b>nil</b> as false
-and anything else as true.
-
-
-<p>
-The negation operator <b>not</b> always returns <b>false</b> or <b>true</b>.
-The conjunction operator <b>and</b> returns its first argument
-if this value is <b>false</b> or <b>nil</b>;
-otherwise, <b>and</b> returns its second argument.
-The disjunction operator <b>or</b> returns its first argument
-if this value is different from <b>nil</b> and <b>false</b>;
-otherwise, <b>or</b> returns its second argument.
-Both <b>and</b> and <b>or</b> use short-cut evaluation;
-that is,
-the second operand is evaluated only if necessary.
-Here are some examples:
-
-<pre>
- 10 or 20 --> 10
- 10 or error() --> 10
- nil or "a" --> "a"
- nil and 10 --> nil
- false and error() --> false
- false and nil --> false
- false or nil --> nil
- 10 and 20 --> 20
-</pre><p>
-(In this manual,
-<code>--></code> indicates the result of the preceding expression.)
-
-
-
-
-
-<h3>2.5.4 - <a name="2.5.4">Concatenation</a></h3><p>
-The string concatenation operator in Lua is
-denoted by two dots ('<code>..</code>').
-If both operands are strings or numbers, then they are converted to
-strings according to the rules mentioned in <a href="#2.2.1">§2.2.1</a>.
-Otherwise, the "concat" metamethod is called (see <a href="#2.8">§2.8</a>).
-
-
-
-
-
-<h3>2.5.5 - <a name="2.5.5">The Length Operator</a></h3>
-
-<p>
-The length operator is denoted by the unary operator <code>#</code>.
-The length of a string is its number of bytes
-(that is, the usual meaning of string length when each
-character is one byte).
-
-
-<p>
-The length of a table <code>t</code> is defined to be any
-integer index <code>n</code>
-such that <code>t[n]</code> is not <b>nil</b> and <code>t[n+1]</code> is <b>nil</b>;
-moreover, if <code>t[1]</code> is <b>nil</b>, <code>n</code> can be zero.
-For a regular array, with non-nil values from 1 to a given <code>n</code>,
-its length is exactly that <code>n</code>,
-the index of its last value.
-If the array has "holes"
-(that is, <b>nil</b> values between other non-nil values),
-then <code>#t</code> can be any of the indices that
-directly precedes a <b>nil</b> value
-(that is, it may consider any such <b>nil</b> value as the end of
-the array).
-
-
-
-
-
-<h3>2.5.6 - <a name="2.5.6">Precedence</a></h3><p>
-Operator precedence in Lua follows the table below,
-from lower to higher priority:
-
-<pre>
- or
- and
- < > <= >= ~= ==
- ..
- + -
- * / %
- not # - (unary)
- ^
-</pre><p>
-As usual,
-you can use parentheses to change the precedences of an expression.
-The concatenation ('<code>..</code>') and exponentiation ('<code>^</code>')
-operators are right associative.
-All other binary operators are left associative.
-
-
-
-
-
-<h3>2.5.7 - <a name="2.5.7">Table Constructors</a></h3><p>
-Table constructors are expressions that create tables.
-Every time a constructor is evaluated, a new table is created.
-A constructor can be used to create an empty table
-or to create a table and initialize some of its fields.
-The general syntax for constructors is
-
-<pre>
- tableconstructor ::= `<b>{</b>´ [fieldlist] `<b>}</b>´
- fieldlist ::= field {fieldsep field} [fieldsep]
- field ::= `<b>[</b>´ exp `<b>]</b>´ `<b>=</b>´ exp | Name `<b>=</b>´ exp | exp
- fieldsep ::= `<b>,</b>´ | `<b>;</b>´
-</pre>
-
-<p>
-Each field of the form <code>[exp1] = exp2</code> adds to the new table an entry
-with key <code>exp1</code> and value <code>exp2</code>.
-A field of the form <code>name = exp</code> is equivalent to
-<code>["name"] = exp</code>.
-Finally, fields of the form <code>exp</code> are equivalent to
-<code>[i] = exp</code>, where <code>i</code> are consecutive numerical integers,
-starting with 1.
-Fields in the other formats do not affect this counting.
-For example,
-
-<pre>
- a = { [f(1)] = g; "x", "y"; x = 1, f(x), [30] = 23; 45 }
-</pre><p>
-is equivalent to
-
-<pre>
- do
- local t = {}
- t[f(1)] = g
- t[1] = "x" -- 1st exp
- t[2] = "y" -- 2nd exp
- t.x = 1 -- t["x"] = 1
- t[3] = f(x) -- 3rd exp
- t[30] = 23
- t[4] = 45 -- 4th exp
- a = t
- end
-</pre>
-
-<p>
-If the last field in the list has the form <code>exp</code>
-and the expression is a function call or a vararg expression,
-then all values returned by this expression enter the list consecutively
-(see <a href="#2.5.8">§2.5.8</a>).
-To avoid this,
-enclose the function call or the vararg expression
-in parentheses (see <a href="#2.5">§2.5</a>).
-
-
-<p>
-The field list can have an optional trailing separator,
-as a convenience for machine-generated code.
-
-
-
-
-
-<h3>2.5.8 - <a name="2.5.8">Function Calls</a></h3><p>
-A function call in Lua has the following syntax:
-
-<pre>
- functioncall ::= prefixexp args
-</pre><p>
-In a function call,
-first prefixexp and args are evaluated.
-If the value of prefixexp has type <em>function</em>,
-then this function is called
-with the given arguments.
-Otherwise, the prefixexp "call" metamethod is called,
-having as first parameter the value of prefixexp,
-followed by the original call arguments
-(see <a href="#2.8">§2.8</a>).
-
-
-<p>
-The form
-
-<pre>
- functioncall ::= prefixexp `<b>:</b>´ Name args
-</pre><p>
-can be used to call "methods".
-A call <code>v:name(<em>args</em>)</code>
-is syntactic sugar for <code>v.name(v,<em>args</em>)</code>,
-except that <code>v</code> is evaluated only once.
-
-
-<p>
-Arguments have the following syntax:
-
-<pre>
- args ::= `<b>(</b>´ [explist] `<b>)</b>´
- args ::= tableconstructor
- args ::= String
-</pre><p>
-All argument expressions are evaluated before the call.
-A call of the form <code>f{<em>fields</em>}</code> is
-syntactic sugar for <code>f({<em>fields</em>})</code>;
-that is, the argument list is a single new table.
-A call of the form <code>f'<em>string</em>'</code>
-(or <code>f"<em>string</em>"</code> or <code>f[[<em>string</em>]]</code>)
-is syntactic sugar for <code>f('<em>string</em>')</code>;
-that is, the argument list is a single literal string.
-
-
-<p>
-As an exception to the free-format syntax of Lua,
-you cannot put a line break before the '<code>(</code>' in a function call.
-This restriction avoids some ambiguities in the language.
-If you write
-
-<pre>
- a = f
- (g).x(a)
-</pre><p>
-Lua would see that as a single statement, <code>a = f(g).x(a)</code>.
-So, if you want two statements, you must add a semi-colon between them.
-If you actually want to call <code>f</code>,
-you must remove the line break before <code>(g)</code>.
-
-
-<p>
-A call of the form <code>return</code> <em>functioncall</em> is called
-a <em>tail call</em>.
-Lua implements <em>proper tail calls</em>
-(or <em>proper tail recursion</em>):
-in a tail call,
-the called function reuses the stack entry of the calling function.
-Therefore, there is no limit on the number of nested tail calls that
-a program can execute.
-However, a tail call erases any debug information about the
-calling function.
-Note that a tail call only happens with a particular syntax,
-where the <b>return</b> has one single function call as argument;
-this syntax makes the calling function return exactly
-the returns of the called function.
-So, none of the following examples are tail calls:
-
-<pre>
- return (f(x)) -- results adjusted to 1
- return 2 * f(x)
- return x, f(x) -- additional results
- f(x); return -- results discarded
- return x or f(x) -- results adjusted to 1
-</pre>
-
-
-
-
-<h3>2.5.9 - <a name="2.5.9">Function Definitions</a></h3>
-
-<p>
-The syntax for function definition is
-
-<pre>
- function ::= <b>function</b> funcbody
- funcbody ::= `<b>(</b>´ [parlist] `<b>)</b>´ block <b>end</b>
-</pre>
-
-<p>
-The following syntactic sugar simplifies function definitions:
-
-<pre>
- stat ::= <b>function</b> funcname funcbody
- stat ::= <b>local</b> <b>function</b> Name funcbody
- funcname ::= Name {`<b>.</b>´ Name} [`<b>:</b>´ Name]
-</pre><p>
-The statement
-
-<pre>
- function f () <em>body</em> end
-</pre><p>
-translates to
-
-<pre>
- f = function () <em>body</em> end
-</pre><p>
-The statement
-
-<pre>
- function t.a.b.c.f () <em>body</em> end
-</pre><p>
-translates to
-
-<pre>
- t.a.b.c.f = function () <em>body</em> end
-</pre><p>
-The statement
-
-<pre>
- local function f () <em>body</em> end
-</pre><p>
-translates to
-
-<pre>
- local f; f = function () <em>body</em> end
-</pre><p>
-<em>not</em> to
-
-<pre>
- local f = function () <em>body</em> end
-</pre><p>
-(This only makes a difference when the body of the function
-contains references to <code>f</code>.)
-
-
-<p>
-A function definition is an executable expression,
-whose value has type <em>function</em>.
-When Lua pre-compiles a chunk,
-all its function bodies are pre-compiled too.
-Then, whenever Lua executes the function definition,
-the function is <em>instantiated</em> (or <em>closed</em>).
-This function instance (or <em>closure</em>)
-is the final value of the expression.
-Different instances of the same function
-can refer to different external local variables
-and can have different environment tables.
-
-
-<p>
-Parameters act as local variables that are
-initialized with the argument values:
-
-<pre>
- parlist ::= namelist [`<b>,</b>´ `<b>...</b>´] | `<b>...</b>´
-</pre><p>
-When a function is called,
-the list of arguments is adjusted to
-the length of the list of parameters,
-unless the function is a variadic or <em>vararg function</em>,
-which is
-indicated by three dots ('<code>...</code>') at the end of its parameter list.
-A vararg function does not adjust its argument list;
-instead, it collects all extra arguments and supplies them
-to the function through a <em>vararg expression</em>,
-which is also written as three dots.
-The value of this expression is a list of all actual extra arguments,
-similar to a function with multiple results.
-If a vararg expression is used inside another expression
-or in the middle of a list of expressions,
-then its return list is adjusted to one element.
-If the expression is used as the last element of a list of expressions,
-then no adjustment is made
-(unless that last expression is enclosed in parentheses).
-
-
-<p>
-As an example, consider the following definitions:
-
-<pre>
- function f(a, b) end
- function g(a, b, ...) end
- function r() return 1,2,3 end
-</pre><p>
-Then, we have the following mapping from arguments to parameters and
-to the vararg expression:
-
-<pre>
- CALL PARAMETERS
-
- f(3) a=3, b=nil
- f(3, 4) a=3, b=4
- f(3, 4, 5) a=3, b=4
- f(r(), 10) a=1, b=10
- f(r()) a=1, b=2
-
- g(3) a=3, b=nil, ... --> (nothing)
- g(3, 4) a=3, b=4, ... --> (nothing)
- g(3, 4, 5, 8) a=3, b=4, ... --> 5 8
- g(5, r()) a=5, b=1, ... --> 2 3
-</pre>
-
-<p>
-Results are returned using the <b>return</b> statement (see <a href="#2.4.4">§2.4.4</a>).
-If control reaches the end of a function
-without encountering a <b>return</b> statement,
-then the function returns with no results.
-
-
-<p>
-The <em>colon</em> syntax
-is used for defining <em>methods</em>,
-that is, functions that have an implicit extra parameter <code>self</code>.
-Thus, the statement
-
-<pre>
- function t.a.b.c:f (<em>params</em>) <em>body</em> end
-</pre><p>
-is syntactic sugar for
-
-<pre>
- t.a.b.c.f = function (self, <em>params</em>) <em>body</em> end
-</pre>
-
-
-
-
-
-
-<h2>2.6 - <a name="2.6">Visibility Rules</a></h2>
-
-<p>
-
-Lua is a lexically scoped language.
-The scope of variables begins at the first statement <em>after</em>
-their declaration and lasts until the end of the innermost block that
-includes the declaration.
-Consider the following example:
-
-<pre>
- x = 10 -- global variable
- do -- new block
- local x = x -- new 'x', with value 10
- print(x) --> 10
- x = x+1
- do -- another block
- local x = x+1 -- another 'x'
- print(x) --> 12
- end
- print(x) --> 11
- end
- print(x) --> 10 (the global one)
-</pre>
-
-<p>
-Notice that, in a declaration like <code>local x = x</code>,
-the new <code>x</code> being declared is not in scope yet,
-and so the second <code>x</code> refers to the outside variable.
-
-
-<p>
-Because of the lexical scoping rules,
-local variables can be freely accessed by functions
-defined inside their scope.
-A local variable used by an inner function is called
-an <em>upvalue</em>, or <em>external local variable</em>,
-inside the inner function.
-
-
-<p>
-Notice that each execution of a <b>local</b> statement
-defines new local variables.
-Consider the following example:
-
-<pre>
- a = {}
- local x = 20
- for i=1,10 do
- local y = 0
- a[i] = function () y=y+1; return x+y end
- end
-</pre><p>
-The loop creates ten closures
-(that is, ten instances of the anonymous function).
-Each of these closures uses a different <code>y</code> variable,
-while all of them share the same <code>x</code>.
-
-
-
-
-
-<h2>2.7 - <a name="2.7">Error Handling</a></h2>
-
-<p>
-Because Lua is an embedded extension language,
-all Lua actions start from C code in the host program
-calling a function from the Lua library (see <a href="#lua_pcall"><code>lua_pcall</code></a>).
-Whenever an error occurs during Lua compilation or execution,
-control returns to C,
-which can take appropriate measures
-(such as printing an error message).
-
-
-<p>
-Lua code can explicitly generate an error by calling the
-<a href="#pdf-error"><code>error</code></a> function.
-If you need to catch errors in Lua,
-you can use the <a href="#pdf-pcall"><code>pcall</code></a> function.
-
-
-
-
-
-<h2>2.8 - <a name="2.8">Metatables</a></h2>
-
-<p>
-Every value in Lua can have a <em>metatable</em>.
-This <em>metatable</em> is an ordinary Lua table
-that defines the behavior of the original value
-under certain special operations.
-You can change several aspects of the behavior
-of operations over a value by setting specific fields in its metatable.
-For instance, when a non-numeric value is the operand of an addition,
-Lua checks for a function in the field <code>"__add"</code> in its metatable.
-If it finds one,
-Lua calls this function to perform the addition.
-
-
-<p>
-We call the keys in a metatable <em>events</em>
-and the values <em>metamethods</em>.
-In the previous example, the event is <code>"add"</code>
-and the metamethod is the function that performs the addition.
-
-
-<p>
-You can query the metatable of any value
-through the <a href="#pdf-getmetatable"><code>getmetatable</code></a> function.
-
-
-<p>
-You can replace the metatable of tables
-through the <a href="#pdf-setmetatable"><code>setmetatable</code></a>
-function.
-You cannot change the metatable of other types from Lua
-(except by using the debug library);
-you must use the C API for that.
-
-
-<p>
-Tables and full userdata have individual metatables
-(although multiple tables and userdata can share their metatables).
-Values of all other types share one single metatable per type;
-that is, there is one single metatable for all numbers,
-one for all strings, etc.
-
-
-<p>
-A metatable controls how an object behaves in arithmetic operations,
-order comparisons, concatenation, length operation, and indexing.
-A metatable also can define a function to be called when a userdata
-is garbage collected.
-For each of these operations Lua associates a specific key
-called an <em>event</em>.
-When Lua performs one of these operations over a value,
-it checks whether this value has a metatable with the corresponding event.
-If so, the value associated with that key (the metamethod)
-controls how Lua will perform the operation.
-
-
-<p>
-Metatables control the operations listed next.
-Each operation is identified by its corresponding name.
-The key for each operation is a string with its name prefixed by
-two underscores, '<code>__</code>';
-for instance, the key for operation "add" is the
-string <code>"__add"</code>.
-The semantics of these operations is better explained by a Lua function
-describing how the interpreter executes the operation.
-
-
-<p>
-The code shown here in Lua is only illustrative;
-the real behavior is hard coded in the interpreter
-and it is much more efficient than this simulation.
-All functions used in these descriptions
-(<a href="#pdf-rawget"><code>rawget</code></a>, <a href="#pdf-tonumber"><code>tonumber</code></a>, etc.)
-are described in <a href="#5.1">§5.1</a>.
-In particular, to retrieve the metamethod of a given object,
-we use the expression
-
-<pre>
- metatable(obj)[event]
-</pre><p>
-This should be read as
-
-<pre>
- rawget(getmetatable(obj) or {}, event)
-</pre><p>
-
-That is, the access to a metamethod does not invoke other metamethods,
-and the access to objects with no metatables does not fail
-(it simply results in <b>nil</b>).
-
-
-
-<ul>
-
-<li><b>"add":</b>
-the <code>+</code> operation.
-
-
-
-<p>
-The function <code>getbinhandler</code> below defines how Lua chooses a handler
-for a binary operation.
-First, Lua tries the first operand.
-If its type does not define a handler for the operation,
-then Lua tries the second operand.
-
-<pre>
- function getbinhandler (op1, op2, event)
- return metatable(op1)[event] or metatable(op2)[event]
- end
-</pre><p>
-By using this function,
-the behavior of the <code>op1 + op2</code> is
-
-<pre>
- function add_event (op1, op2)
- local o1, o2 = tonumber(op1), tonumber(op2)
- if o1 and o2 then -- both operands are numeric?
- return o1 + o2 -- '+' here is the primitive 'add'
- else -- at least one of the operands is not numeric
- local h = getbinhandler(op1, op2, "__add")
- if h then
- -- call the handler with both operands
- return (h(op1, op2))
- else -- no handler available: default behavior
- error(···)
- end
- end
- end
-</pre><p>
-</li>
-
-<li><b>"sub":</b>
-the <code>-</code> operation.
-
-Behavior similar to the "add" operation.
-</li>
-
-<li><b>"mul":</b>
-the <code>*</code> operation.
-
-Behavior similar to the "add" operation.
-</li>
-
-<li><b>"div":</b>
-the <code>/</code> operation.
-
-Behavior similar to the "add" operation.
-</li>
-
-<li><b>"mod":</b>
-the <code>%</code> operation.
-
-Behavior similar to the "add" operation,
-with the operation
-<code>o1 - floor(o1/o2)*o2</code> as the primitive operation.
-</li>
-
-<li><b>"pow":</b>
-the <code>^</code> (exponentiation) operation.
-
-Behavior similar to the "add" operation,
-with the function <code>pow</code> (from the C math library)
-as the primitive operation.
-</li>
-
-<li><b>"unm":</b>
-the unary <code>-</code> operation.
-
-
-<pre>
- function unm_event (op)
- local o = tonumber(op)
- if o then -- operand is numeric?
- return -o -- '-' here is the primitive 'unm'
- else -- the operand is not numeric.
- -- Try to get a handler from the operand
- local h = metatable(op).__unm
- if h then
- -- call the handler with the operand
- return (h(op))
- else -- no handler available: default behavior
- error(···)
- end
- end
- end
-</pre><p>
-</li>
-
-<li><b>"concat":</b>
-the <code>..</code> (concatenation) operation.
-
-
-<pre>
- function concat_event (op1, op2)
- if (type(op1) == "string" or type(op1) == "number") and
- (type(op2) == "string" or type(op2) == "number") then
- return op1 .. op2 -- primitive string concatenation
- else
- local h = getbinhandler(op1, op2, "__concat")
- if h then
- return (h(op1, op2))
- else
- error(···)
- end
- end
- end
-</pre><p>
-</li>
-
-<li><b>"len":</b>
-the <code>#</code> operation.
-
-
-<pre>
- function len_event (op)
- if type(op) == "string" then
- return strlen(op) -- primitive string length
- elseif type(op) == "table" then
- return #op -- primitive table length
- else
- local h = metatable(op).__len
- if h then
- -- call the handler with the operand
- return (h(op))
- else -- no handler available: default behavior
- error(···)
- end
- end
- end
-</pre><p>
-See <a href="#2.5.5">§2.5.5</a> for a description of the length of a table.
-</li>
-
-<li><b>"eq":</b>
-the <code>==</code> operation.
-
-The function <code>getcomphandler</code> defines how Lua chooses a metamethod
-for comparison operators.
-A metamethod only is selected when both objects
-being compared have the same type
-and the same metamethod for the selected operation.
-
-<pre>
- function getcomphandler (op1, op2, event)
- if type(op1) ~= type(op2) then return nil end
- local mm1 = metatable(op1)[event]
- local mm2 = metatable(op2)[event]
- if mm1 == mm2 then return mm1 else return nil end
- end
-</pre><p>
-The "eq" event is defined as follows:
-
-<pre>
- function eq_event (op1, op2)
- if type(op1) ~= type(op2) then -- different types?
- return false -- different objects
- end
- if op1 == op2 then -- primitive equal?
- return true -- objects are equal
- end
- -- try metamethod
- local h = getcomphandler(op1, op2, "__eq")
- if h then
- return (h(op1, op2))
- else
- return false
- end
- end
-</pre><p>
-<code>a ~= b</code> is equivalent to <code>not (a == b)</code>.
-</li>
-
-<li><b>"lt":</b>
-the <code><</code> operation.
-
-
-<pre>
- function lt_event (op1, op2)
- if type(op1) == "number" and type(op2) == "number" then
- return op1 < op2 -- numeric comparison
- elseif type(op1) == "string" and type(op2) == "string" then
- return op1 < op2 -- lexicographic comparison
- else
- local h = getcomphandler(op1, op2, "__lt")
- if h then
- return (h(op1, op2))
- else
- error(···)
- end
- end
- end
-</pre><p>
-<code>a > b</code> is equivalent to <code>b < a</code>.
-</li>
-
-<li><b>"le":</b>
-the <code><=</code> operation.
-
-
-<pre>
- function le_event (op1, op2)
- if type(op1) == "number" and type(op2) == "number" then
- return op1 <= op2 -- numeric comparison
- elseif type(op1) == "string" and type(op2) == "string" then
- return op1 <= op2 -- lexicographic comparison
- else
- local h = getcomphandler(op1, op2, "__le")
- if h then
- return (h(op1, op2))
- else
- h = getcomphandler(op1, op2, "__lt")
- if h then
- return not h(op2, op1)
- else
- error(···)
- end
- end
- end
- end
-</pre><p>
-<code>a >= b</code> is equivalent to <code>b <= a</code>.
-Note that, in the absence of a "le" metamethod,
-Lua tries the "lt", assuming that <code>a <= b</code> is
-equivalent to <code>not (b < a)</code>.
-</li>
-
-<li><b>"index":</b>
-The indexing access <code>table[key]</code>.
-
-
-<pre>
- function gettable_event (table, key)
- local h
- if type(table) == "table" then
- local v = rawget(table, key)
- if v ~= nil then return v end
- h = metatable(table).__index
- if h == nil then return nil end
- else
- h = metatable(table).__index
- if h == nil then
- error(···)
- end
- end
- if type(h) == "function" then
- return (h(table, key)) -- call the handler
- else return h[key] -- or repeat operation on it
- end
- end
-</pre><p>
-</li>
-
-<li><b>"newindex":</b>
-The indexing assignment <code>table[key] = value</code>.
-
-
-<pre>
- function settable_event (table, key, value)
- local h
- if type(table) == "table" then
- local v = rawget(table, key)
- if v ~= nil then rawset(table, key, value); return end
- h = metatable(table).__newindex
- if h == nil then rawset(table, key, value); return end
- else
- h = metatable(table).__newindex
- if h == nil then
- error(···)
- end
- end
- if type(h) == "function" then
- h(table, key,value) -- call the handler
- else h[key] = value -- or repeat operation on it
- end
- end
-</pre><p>
-</li>
-
-<li><b>"call":</b>
-called when Lua calls a value.
-
-
-<pre>
- function function_event (func, ...)
- if type(func) == "function" then
- return func(...) -- primitive call
- else
- local h = metatable(func).__call
- if h then
- return h(func, ...)
- else
- error(···)
- end
- end
- end
-</pre><p>
-</li>
-
-</ul>
-
-
-
-
-<h2>2.9 - <a name="2.9">Environments</a></h2>
-
-<p>
-Besides metatables,
-objects of types thread, function, and userdata
-have another table associated with them,
-called their <em>environment</em>.
-Like metatables, environments are regular tables and
-multiple objects can share the same environment.
-
-
-<p>
-Threads are created sharing the environment of the creating thread.
-Userdata and C functions are created sharing the environment
-of the creating C function.
-Non-nested Lua functions
-(created by <a href="#pdf-loadfile"><code>loadfile</code></a>, <a href="#pdf-loadstring"><code>loadstring</code></a> or <a href="#pdf-load"><code>load</code></a>)
-are created sharing the environment of the creating thread.
-Nested Lua functions are created sharing the environment of
-the creating Lua function.
-
-
-<p>
-Environments associated with userdata have no meaning for Lua.
-It is only a convenience feature for programmers to associate a table to
-a userdata.
-
-
-<p>
-Environments associated with threads are called
-<em>global environments</em>.
-They are used as the default environment for threads and
-non-nested Lua functions created by the thread
-and can be directly accessed by C code (see <a href="#3.3">§3.3</a>).
-
-
-<p>
-The environment associated with a C function can be directly
-accessed by C code (see <a href="#3.3">§3.3</a>).
-It is used as the default environment for other C functions
-and userdata created by the function.
-
-
-<p>
-Environments associated with Lua functions are used to resolve
-all accesses to global variables within the function (see <a href="#2.3">§2.3</a>).
-They are used as the default environment for nested Lua functions
-created by the function.
-
-
-<p>
-You can change the environment of a Lua function or the
-running thread by calling <a href="#pdf-setfenv"><code>setfenv</code></a>.
-You can get the environment of a Lua function or the running thread
-by calling <a href="#pdf-getfenv"><code>getfenv</code></a>.
-To manipulate the environment of other objects
-(userdata, C functions, other threads) you must
-use the C API.
-
-
-
-
-
-<h2>2.10 - <a name="2.10">Garbage Collection</a></h2>
-
-<p>
-Lua performs automatic memory management.
-This means that
-you have to worry neither about allocating memory for new objects
-nor about freeing it when the objects are no longer needed.
-Lua manages memory automatically by running
-a <em>garbage collector</em> from time to time
-to collect all <em>dead objects</em>
-(that is, objects that are no longer accessible from Lua).
-All memory used by Lua is subject to automatic management:
-tables, userdata, functions, threads, strings, etc.
-
-
-<p>
-Lua implements an incremental mark-and-sweep collector.
-It uses two numbers to control its garbage-collection cycles:
-the <em>garbage-collector pause</em> and
-the <em>garbage-collector step multiplier</em>.
-Both use percentage points as units
-(so that a value of 100 means an internal value of 1).
-
-
-<p>
-The garbage-collector pause
-controls how long the collector waits before starting a new cycle.
-Larger values make the collector less aggressive.
-Values smaller than 100 mean the collector will not wait to
-start a new cycle.
-A value of 200 means that the collector waits for the total memory in use
-to double before starting a new cycle.
-
-
-<p>
-The step multiplier
-controls the relative speed of the collector relative to
-memory allocation.
-Larger values make the collector more aggressive but also increase
-the size of each incremental step.
-Values smaller than 100 make the collector too slow and
-can result in the collector never finishing a cycle.
-The default, 200, means that the collector runs at "twice"
-the speed of memory allocation.
-
-
-<p>
-You can change these numbers by calling <a href="#lua_gc"><code>lua_gc</code></a> in C
-or <a href="#pdf-collectgarbage"><code>collectgarbage</code></a> in Lua.
-With these functions you can also control
-the collector directly (e.g., stop and restart it).
-
-
-
-<h3>2.10.1 - <a name="2.10.1">Garbage-Collection Metamethods</a></h3>
-
-<p>
-Using the C API,
-you can set garbage-collector metamethods for userdata (see <a href="#2.8">§2.8</a>).
-These metamethods are also called <em>finalizers</em>.
-Finalizers allow you to coordinate Lua's garbage collection
-with external resource management
-(such as closing files, network or database connections,
-or freeing your own memory).
-
-
-<p>
-Garbage userdata with a field <code>__gc</code> in their metatables are not
-collected immediately by the garbage collector.
-Instead, Lua puts them in a list.
-After the collection,
-Lua does the equivalent of the following function
-for each userdata in that list:
-
-<pre>
- function gc_event (udata)
- local h = metatable(udata).__gc
- if h then
- h(udata)
- end
- end
-</pre>
-
-<p>
-At the end of each garbage-collection cycle,
-the finalizers for userdata are called in <em>reverse</em>
-order of their creation,
-among those collected in that cycle.
-That is, the first finalizer to be called is the one associated
-with the userdata created last in the program.
-The userdata itself is freed only in the next garbage-collection cycle.
-
-
-
-
-
-<h3>2.10.2 - <a name="2.10.2">Weak Tables</a></h3>
-
-<p>
-A <em>weak table</em> is a table whose elements are
-<em>weak references</em>.
-A weak reference is ignored by the garbage collector.
-In other words,
-if the only references to an object are weak references,
-then the garbage collector will collect this object.
-
-
-<p>
-A weak table can have weak keys, weak values, or both.
-A table with weak keys allows the collection of its keys,
-but prevents the collection of its values.
-A table with both weak keys and weak values allows the collection of
-both keys and values.
-In any case, if either the key or the value is collected,
-the whole pair is removed from the table.
-The weakness of a table is controlled by the
-<code>__mode</code> field of its metatable.
-If the <code>__mode</code> field is a string containing the character '<code>k</code>',
-the keys in the table are weak.
-If <code>__mode</code> contains '<code>v</code>',
-the values in the table are weak.
-
-
-<p>
-After you use a table as a metatable,
-you should not change the value of its <code>__mode</code> field.
-Otherwise, the weak behavior of the tables controlled by this
-metatable is undefined.
-
-
-
-
-
-
-
-<h2>2.11 - <a name="2.11">Coroutines</a></h2>
-
-<p>
-Lua supports coroutines,
-also called <em>collaborative multithreading</em>.
-A coroutine in Lua represents an independent thread of execution.
-Unlike threads in multithread systems, however,
-a coroutine only suspends its execution by explicitly calling
-a yield function.
-
-
-<p>
-You create a coroutine with a call to <a href="#pdf-coroutine.create"><code>coroutine.create</code></a>.
-Its sole argument is a function
-that is the main function of the coroutine.
-The <code>create</code> function only creates a new coroutine and
-returns a handle to it (an object of type <em>thread</em>);
-it does not start the coroutine execution.
-
-
-<p>
-When you first call <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a>,
-passing as its first argument
-a thread returned by <a href="#pdf-coroutine.create"><code>coroutine.create</code></a>,
-the coroutine starts its execution,
-at the first line of its main function.
-Extra arguments passed to <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a> are passed on
-to the coroutine main function.
-After the coroutine starts running,
-it runs until it terminates or <em>yields</em>.
-
-
-<p>
-A coroutine can terminate its execution in two ways:
-normally, when its main function returns
-(explicitly or implicitly, after the last instruction);
-and abnormally, if there is an unprotected error.
-In the first case, <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a> returns <b>true</b>,
-plus any values returned by the coroutine main function.
-In case of errors, <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a> returns <b>false</b>
-plus an error message.
-
-
-<p>
-A coroutine yields by calling <a href="#pdf-coroutine.yield"><code>coroutine.yield</code></a>.
-When a coroutine yields,
-the corresponding <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a> returns immediately,
-even if the yield happens inside nested function calls
-(that is, not in the main function,
-but in a function directly or indirectly called by the main function).
-In the case of a yield, <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a> also returns <b>true</b>,
-plus any values passed to <a href="#pdf-coroutine.yield"><code>coroutine.yield</code></a>.
-The next time you resume the same coroutine,
-it continues its execution from the point where it yielded,
-with the call to <a href="#pdf-coroutine.yield"><code>coroutine.yield</code></a> returning any extra
-arguments passed to <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a>.
-
-
-<p>
-Like <a href="#pdf-coroutine.create"><code>coroutine.create</code></a>,
-the <a href="#pdf-coroutine.wrap"><code>coroutine.wrap</code></a> function also creates a coroutine,
-but instead of returning the coroutine itself,
-it returns a function that, when called, resumes the coroutine.
-Any arguments passed to this function
-go as extra arguments to <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a>.
-<a href="#pdf-coroutine.wrap"><code>coroutine.wrap</code></a> returns all the values returned by <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a>,
-except the first one (the boolean error code).
-Unlike <a href="#pdf-coroutine.resume"><code>coroutine.resume</code></a>,
-<a href="#pdf-coroutine.wrap"><code>coroutine.wrap</code></a> does not catch errors;
-any error is propagated to the caller.
-
-
-<p>
-As an example,
-consider the following code:
-
-<pre>
- function foo (a)
- print("foo", a)
- return coroutine.yield(2*a)
- end
-
- co = coroutine.create(function (a,b)
- print("co-body", a, b)
- local r = foo(a+1)
- print("co-body", r)
- local r, s = coroutine.yield(a+b, a-b)
- print("co-body", r, s)
- return b, "end"
- end)
-
- print("main", coroutine.resume(co, 1, 10))
- print("main", coroutine.resume(co, "r"))
- print("main", coroutine.resume(co, "x", "y"))
- print("main", coroutine.resume(co, "x", "y"))
-</pre><p>
-When you run it, it produces the following output:
-
-<pre>
- co-body 1 10
- foo 2
-
- main true 4
- co-body r
- main true 11 -9
- co-body x y
- main true 10 end
- main false cannot resume dead coroutine
-</pre>
-
-
-
-
-<h1>3 - <a name="3">The Application Program Interface</a></h1>
-
-<p>
-
-This section describes the C API for Lua, that is,
-the set of C functions available to the host program to communicate
-with Lua.
-All API functions and related types and constants
-are declared in the header file <a name="pdf-lua.h"><code>lua.h</code></a>.
-
-
-<p>
-Even when we use the term "function",
-any facility in the API may be provided as a macro instead.
-All such macros use each of their arguments exactly once
-(except for the first argument, which is always a Lua state),
-and so do not generate any hidden side-effects.
-
-
-<p>
-As in most C libraries,
-the Lua API functions do not check their arguments for validity or consistency.
-However, you can change this behavior by compiling Lua
-with a proper definition for the macro <a name="pdf-luai_apicheck"><code>luai_apicheck</code></a>,
-in file <code>luaconf.h</code>.
-
-
-
-<h2>3.1 - <a name="3.1">The Stack</a></h2>
-
-<p>
-Lua uses a <em>virtual stack</em> to pass values to and from C.
-Each element in this stack represents a Lua value
-(<b>nil</b>, number, string, etc.).
-
-
-<p>
-Whenever Lua calls C, the called function gets a new stack,
-which is independent of previous stacks and of stacks of
-C functions that are still active.
-This stack initially contains any arguments to the C function
-and it is where the C function pushes its results
-to be returned to the caller (see <a href="#lua_CFunction"><code>lua_CFunction</code></a>).
-
-
-<p>
-For convenience,
-most query operations in the API do not follow a strict stack discipline.
-Instead, they can refer to any element in the stack
-by using an <em>index</em>:
-A positive index represents an <em>absolute</em> stack position
-(starting at 1);
-a negative index represents an <em>offset</em> relative to the top of the stack.
-More specifically, if the stack has <em>n</em> elements,
-then index 1 represents the first element
-(that is, the element that was pushed onto the stack first)
-and
-index <em>n</em> represents the last element;
-index -1 also represents the last element
-(that is, the element at the top)
-and index <em>-n</em> represents the first element.
-We say that an index is <em>valid</em>
-if it lies between 1 and the stack top
-(that is, if <code>1 ≤ abs(index) ≤ top</code>).
-
-
-
-
-
-
-<h2>3.2 - <a name="3.2">Stack Size</a></h2>
-
-<p>
-When you interact with Lua API,
-you are responsible for ensuring consistency.
-In particular,
-<em>you are responsible for controlling stack overflow</em>.
-You can use the function <a href="#lua_checkstack"><code>lua_checkstack</code></a>
-to grow the stack size.
-
-
-<p>
-Whenever Lua calls C,
-it ensures that at least <a name="pdf-LUA_MINSTACK"><code>LUA_MINSTACK</code></a> stack positions are available.
-<code>LUA_MINSTACK</code> is defined as 20,
-so that usually you do not have to worry about stack space
-unless your code has loops pushing elements onto the stack.
-
-
-<p>
-Most query functions accept as indices any value inside the
-available stack space, that is, indices up to the maximum stack size
-you have set through <a href="#lua_checkstack"><code>lua_checkstack</code></a>.
-Such indices are called <em>acceptable indices</em>.
-More formally, we define an <em>acceptable index</em>
-as follows:
-
-<pre>
- (index < 0 && abs(index) <= top) ||
- (index > 0 && index <= stackspace)
-</pre><p>
-Note that 0 is never an acceptable index.
-
-
-
-
-
-<h2>3.3 - <a name="3.3">Pseudo-Indices</a></h2>
-
-<p>
-Unless otherwise noted,
-any function that accepts valid indices can also be called with
-<em>pseudo-indices</em>,
-which represent some Lua values that are accessible to C code
-but which are not in the stack.
-Pseudo-indices are used to access the thread environment,
-the function environment,
-the registry,
-and the upvalues of a C function (see <a href="#3.4">§3.4</a>).
-
-
-<p>
-The thread environment (where global variables live) is
-always at pseudo-index <a name="pdf-LUA_GLOBALSINDEX"><code>LUA_GLOBALSINDEX</code></a>.
-The environment of the running C function is always
-at pseudo-index <a name="pdf-LUA_ENVIRONINDEX"><code>LUA_ENVIRONINDEX</code></a>.
-
-
-<p>
-To access and change the value of global variables,
-you can use regular table operations over an environment table.
-For instance, to access the value of a global variable, do
-
-<pre>
- lua_getfield(L, LUA_GLOBALSINDEX, varname);
-</pre>
-
-
-
-
-<h2>3.4 - <a name="3.4">C Closures</a></h2>
-
-<p>
-When a C function is created,
-it is possible to associate some values with it,
-thus creating a <em>C closure</em>;
-these values are called <em>upvalues</em> and are
-accessible to the function whenever it is called
-(see <a href="#lua_pushcclosure"><code>lua_pushcclosure</code></a>).
-
-
-<p>
-Whenever a C function is called,
-its upvalues are located at specific pseudo-indices.
-These pseudo-indices are produced by the macro
-<a name="lua_upvalueindex"><code>lua_upvalueindex</code></a>.
-The first value associated with a function is at position
-<code>lua_upvalueindex(1)</code>, and so on.
-Any access to <code>lua_upvalueindex(<em>n</em>)</code>,
-where <em>n</em> is greater than the number of upvalues of the
-current function (but not greater than 256),
-produces an acceptable (but invalid) index.
-
-
-
-
-
-<h2>3.5 - <a name="3.5">Registry</a></h2>
-
-<p>
-Lua provides a <em>registry</em>,
-a pre-defined table that can be used by any C code to
-store whatever Lua value it needs to store.
-This table is always located at pseudo-index
-<a name="pdf-LUA_REGISTRYINDEX"><code>LUA_REGISTRYINDEX</code></a>.
-Any C library can store data into this table,
-but it should take care to choose keys different from those used
-by other libraries, to avoid collisions.
-Typically, you should use as key a string containing your library name
-or a light userdata with the address of a C object in your code.
-
-
-<p>
-The integer keys in the registry are used by the reference mechanism,
-implemented by the auxiliary library,
-and therefore should not be used for other purposes.
-
-
-
-
-
-<h2>3.6 - <a name="3.6">Error Handling in C</a></h2>
-
-<p>
-Internally, Lua uses the C <code>longjmp</code> facility to handle errors.
-(You can also choose to use exceptions if you use C++;
-see file <code>luaconf.h</code>.)
-When Lua faces any error
-(such as memory allocation errors, type errors, syntax errors,
-and runtime errors)
-it <em>raises</em> an error;
-that is, it does a long jump.
-A <em>protected environment</em> uses <code>setjmp</code>
-to set a recover point;
-any error jumps to the most recent active recover point.
-
-
-<p>
-Most functions in the API can throw an error,
-for instance due to a memory allocation error.
-The documentation for each function indicates whether
-it can throw errors.
-
-
-<p>
-Inside a C function you can throw an error by calling <a href="#lua_error"><code>lua_error</code></a>.
-
-
-
-
-
-<h2>3.7 - <a name="3.7">Functions and Types</a></h2>
-
-<p>
-Here we list all functions and types from the C API in
-alphabetical order.
-Each function has an indicator like this:
-<span class="apii">[-o, +p, <em>x</em>]</span>
-
-
-<p>
-The first field, <code>o</code>,
-is how many elements the function pops from the stack.
-The second field, <code>p</code>,
-is how many elements the function pushes onto the stack.
-(Any function always pushes its results after popping its arguments.)
-A field in the form <code>x|y</code> means the function can push (or pop)
-<code>x</code> or <code>y</code> elements,
-depending on the situation;
-an interrogation mark '<code>?</code>' means that
-we cannot know how many elements the function pops/pushes
-by looking only at its arguments
-(e.g., they may depend on what is on the stack).
-The third field, <code>x</code>,
-tells whether the function may throw errors:
-'<code>-</code>' means the function never throws any error;
-'<code>m</code>' means the function may throw an error
-only due to not enough memory;
-'<code>e</code>' means the function may throw other kinds of errors;
-'<code>v</code>' means the function may throw an error on purpose.
-
-
-
-<hr><h3><a name="lua_Alloc"><code>lua_Alloc</code></a></h3>
-<pre>typedef void * (*lua_Alloc) (void *ud,
- void *ptr,
- size_t osize,
- size_t nsize);</pre>
-
-<p>
-The type of the memory-allocation function used by Lua states.
-The allocator function must provide a
-functionality similar to <code>realloc</code>,
-but not exactly the same.
-Its arguments are
-<code>ud</code>, an opaque pointer passed to <a href="#lua_newstate"><code>lua_newstate</code></a>;
-<code>ptr</code>, a pointer to the block being allocated/reallocated/freed;
-<code>osize</code>, the original size of the block;
-<code>nsize</code>, the new size of the block.
-<code>ptr</code> is <code>NULL</code> if and only if <code>osize</code> is zero.
-When <code>nsize</code> is zero, the allocator must return <code>NULL</code>;
-if <code>osize</code> is not zero,
-it should free the block pointed to by <code>ptr</code>.
-When <code>nsize</code> is not zero, the allocator returns <code>NULL</code>
-if and only if it cannot fill the request.
-When <code>nsize</code> is not zero and <code>osize</code> is zero,
-the allocator should behave like <code>malloc</code>.
-When <code>nsize</code> and <code>osize</code> are not zero,
-the allocator behaves like <code>realloc</code>.
-Lua assumes that the allocator never fails when
-<code>osize >= nsize</code>.
-
-
-<p>
-Here is a simple implementation for the allocator function.
-It is used in the auxiliary library by <a href="#luaL_newstate"><code>luaL_newstate</code></a>.
-
-<pre>
- static void *l_alloc (void *ud, void *ptr, size_t osize,
- size_t nsize) {
- (void)ud; (void)osize; /* not used */
- if (nsize == 0) {
- free(ptr);
- return NULL;
- }
- else
- return realloc(ptr, nsize);
- }
-</pre><p>
-This code assumes
-that <code>free(NULL)</code> has no effect and that
-<code>realloc(NULL, size)</code> is equivalent to <code>malloc(size)</code>.
-ANSI C ensures both behaviors.
-
-
-
-
-
-<hr><h3><a name="lua_atpanic"><code>lua_atpanic</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf);</pre>
-
-<p>
-Sets a new panic function and returns the old one.
-
-
-<p>
-If an error happens outside any protected environment,
-Lua calls a <em>panic function</em>
-and then calls <code>exit(EXIT_FAILURE)</code>,
-thus exiting the host application.
-Your panic function can avoid this exit by
-never returning (e.g., doing a long jump).
-
-
-<p>
-The panic function can access the error message at the top of the stack.
-
-
-
-
-
-<hr><h3><a name="lua_call"><code>lua_call</code></a></h3><p>
-<span class="apii">[-(nargs + 1), +nresults, <em>e</em>]</span>
-<pre>void lua_call (lua_State *L, int nargs, int nresults);</pre>
-
-<p>
-Calls a function.
-
-
-<p>
-To call a function you must use the following protocol:
-first, the function to be called is pushed onto the stack;
-then, the arguments to the function are pushed
-in direct order;
-that is, the first argument is pushed first.
-Finally you call <a href="#lua_call"><code>lua_call</code></a>;
-<code>nargs</code> is the number of arguments that you pushed onto the stack.
-All arguments and the function value are popped from the stack
-when the function is called.
-The function results are pushed onto the stack when the function returns.
-The number of results is adjusted to <code>nresults</code>,
-unless <code>nresults</code> is <a name="pdf-LUA_MULTRET"><code>LUA_MULTRET</code></a>.
-In this case, <em>all</em> results from the function are pushed.
-Lua takes care that the returned values fit into the stack space.
-The function results are pushed onto the stack in direct order
-(the first result is pushed first),
-so that after the call the last result is on the top of the stack.
-
-
-<p>
-Any error inside the called function is propagated upwards
-(with a <code>longjmp</code>).
-
-
-<p>
-The following example shows how the host program can do the
-equivalent to this Lua code:
-
-<pre>
- a = f("how", t.x, 14)
-</pre><p>
-Here it is in C:
-
-<pre>
- lua_getfield(L, LUA_GLOBALSINDEX, "f"); /* function to be called */
- lua_pushstring(L, "how"); /* 1st argument */
- lua_getfield(L, LUA_GLOBALSINDEX, "t"); /* table to be indexed */
- lua_getfield(L, -1, "x"); /* push result of t.x (2nd arg) */
- lua_remove(L, -2); /* remove 't' from the stack */
- lua_pushinteger(L, 14); /* 3rd argument */
- lua_call(L, 3, 1); /* call 'f' with 3 arguments and 1 result */
- lua_setfield(L, LUA_GLOBALSINDEX, "a"); /* set global 'a' */
-</pre><p>
-Note that the code above is "balanced":
-at its end, the stack is back to its original configuration.
-This is considered good programming practice.
-
-
-
-
-
-<hr><h3><a name="lua_CFunction"><code>lua_CFunction</code></a></h3>
-<pre>typedef int (*lua_CFunction) (lua_State *L);</pre>
-
-<p>
-Type for C functions.
-
-
-<p>
-In order to communicate properly with Lua,
-a C function must use the following protocol,
-which defines the way parameters and results are passed:
-a C function receives its arguments from Lua in its stack
-in direct order (the first argument is pushed first).
-So, when the function starts,
-<code>lua_gettop(L)</code> returns the number of arguments received by the function.
-The first argument (if any) is at index 1
-and its last argument is at index <code>lua_gettop(L)</code>.
-To return values to Lua, a C function just pushes them onto the stack,
-in direct order (the first result is pushed first),
-and returns the number of results.
-Any other value in the stack below the results will be properly
-discarded by Lua.
-Like a Lua function, a C function called by Lua can also return
-many results.
-
-
-<p>
-As an example, the following function receives a variable number
-of numerical arguments and returns their average and sum:
-
-<pre>
- static int foo (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- lua_Number sum = 0;
- int i;
- for (i = 1; i <= n; i++) {
- if (!lua_isnumber(L, i)) {
- lua_pushstring(L, "incorrect argument");
- lua_error(L);
- }
- sum += lua_tonumber(L, i);
- }
- lua_pushnumber(L, sum/n); /* first result */
- lua_pushnumber(L, sum); /* second result */
- return 2; /* number of results */
- }
-</pre>
-
-
-
-
-<hr><h3><a name="lua_checkstack"><code>lua_checkstack</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>int lua_checkstack (lua_State *L, int extra);</pre>
-
-<p>
-Ensures that there are at least <code>extra</code> free stack slots in the stack.
-It returns false if it cannot grow the stack to that size.
-This function never shrinks the stack;
-if the stack is already larger than the new size,
-it is left unchanged.
-
-
-
-
-
-<hr><h3><a name="lua_close"><code>lua_close</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>void lua_close (lua_State *L);</pre>
-
-<p>
-Destroys all objects in the given Lua state
-(calling the corresponding garbage-collection metamethods, if any)
-and frees all dynamic memory used by this state.
-On several platforms, you may not need to call this function,
-because all resources are naturally released when the host program ends.
-On the other hand, long-running programs,
-such as a daemon or a web server,
-might need to release states as soon as they are not needed,
-to avoid growing too large.
-
-
-
-
-
-<hr><h3><a name="lua_concat"><code>lua_concat</code></a></h3><p>
-<span class="apii">[-n, +1, <em>e</em>]</span>
-<pre>void lua_concat (lua_State *L, int n);</pre>
-
-<p>
-Concatenates the <code>n</code> values at the top of the stack,
-pops them, and leaves the result at the top.
-If <code>n</code> is 1, the result is the single value on the stack
-(that is, the function does nothing);
-if <code>n</code> is 0, the result is the empty string.
-Concatenation is performed following the usual semantics of Lua
-(see <a href="#2.5.4">§2.5.4</a>).
-
-
-
-
-
-<hr><h3><a name="lua_cpcall"><code>lua_cpcall</code></a></h3><p>
-<span class="apii">[-0, +(0|1), <em>-</em>]</span>
-<pre>int lua_cpcall (lua_State *L, lua_CFunction func, void *ud);</pre>
-
-<p>
-Calls the C function <code>func</code> in protected mode.
-<code>func</code> starts with only one element in its stack,
-a light userdata containing <code>ud</code>.
-In case of errors,
-<a href="#lua_cpcall"><code>lua_cpcall</code></a> returns the same error codes as <a href="#lua_pcall"><code>lua_pcall</code></a>,
-plus the error object on the top of the stack;
-otherwise, it returns zero, and does not change the stack.
-All values returned by <code>func</code> are discarded.
-
-
-
-
-
-<hr><h3><a name="lua_createtable"><code>lua_createtable</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void lua_createtable (lua_State *L, int narr, int nrec);</pre>
-
-<p>
-Creates a new empty table and pushes it onto the stack.
-The new table has space pre-allocated
-for <code>narr</code> array elements and <code>nrec</code> non-array elements.
-This pre-allocation is useful when you know exactly how many elements
-the table will have.
-Otherwise you can use the function <a href="#lua_newtable"><code>lua_newtable</code></a>.
-
-
-
-
-
-<hr><h3><a name="lua_dump"><code>lua_dump</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>int lua_dump (lua_State *L, lua_Writer writer, void *data);</pre>
-
-<p>
-Dumps a function as a binary chunk.
-Receives a Lua function on the top of the stack
-and produces a binary chunk that,
-if loaded again,
-results in a function equivalent to the one dumped.
-As it produces parts of the chunk,
-<a href="#lua_dump"><code>lua_dump</code></a> calls function <code>writer</code> (see <a href="#lua_Writer"><code>lua_Writer</code></a>)
-with the given <code>data</code>
-to write them.
-
-
-<p>
-The value returned is the error code returned by the last
-call to the writer;
-0 means no errors.
-
-
-<p>
-This function does not pop the Lua function from the stack.
-
-
-
-
-
-<hr><h3><a name="lua_equal"><code>lua_equal</code></a></h3><p>
-<span class="apii">[-0, +0, <em>e</em>]</span>
-<pre>int lua_equal (lua_State *L, int index1, int index2);</pre>
-
-<p>
-Returns 1 if the two values in acceptable indices <code>index1</code> and
-<code>index2</code> are equal,
-following the semantics of the Lua <code>==</code> operator
-(that is, may call metamethods).
-Otherwise returns 0.
-Also returns 0 if any of the indices is non valid.
-
-
-
-
-
-<hr><h3><a name="lua_error"><code>lua_error</code></a></h3><p>
-<span class="apii">[-1, +0, <em>v</em>]</span>
-<pre>int lua_error (lua_State *L);</pre>
-
-<p>
-Generates a Lua error.
-The error message (which can actually be a Lua value of any type)
-must be on the stack top.
-This function does a long jump,
-and therefore never returns.
-(see <a href="#luaL_error"><code>luaL_error</code></a>).
-
-
-
-
-
-<hr><h3><a name="lua_gc"><code>lua_gc</code></a></h3><p>
-<span class="apii">[-0, +0, <em>e</em>]</span>
-<pre>int lua_gc (lua_State *L, int what, int data);</pre>
-
-<p>
-Controls the garbage collector.
-
-
-<p>
-This function performs several tasks,
-according to the value of the parameter <code>what</code>:
-
-<ul>
-
-<li><b><code>LUA_GCSTOP</code>:</b>
-stops the garbage collector.
-</li>
-
-<li><b><code>LUA_GCRESTART</code>:</b>
-restarts the garbage collector.
-</li>
-
-<li><b><code>LUA_GCCOLLECT</code>:</b>
-performs a full garbage-collection cycle.
-</li>
-
-<li><b><code>LUA_GCCOUNT</code>:</b>
-returns the current amount of memory (in Kbytes) in use by Lua.
-</li>
-
-<li><b><code>LUA_GCCOUNTB</code>:</b>
-returns the remainder of dividing the current amount of bytes of
-memory in use by Lua by 1024.
-</li>
-
-<li><b><code>LUA_GCSTEP</code>:</b>
-performs an incremental step of garbage collection.
-The step "size" is controlled by <code>data</code>
-(larger values mean more steps) in a non-specified way.
-If you want to control the step size
-you must experimentally tune the value of <code>data</code>.
-The function returns 1 if the step finished a
-garbage-collection cycle.
-</li>
-
-<li><b><code>LUA_GCSETPAUSE</code>:</b>
-sets <code>data</code> as the new value
-for the <em>pause</em> of the collector (see <a href="#2.10">§2.10</a>).
-The function returns the previous value of the pause.
-</li>
-
-<li><b><code>LUA_GCSETSTEPMUL</code>:</b>
-sets <code>data</code> as the new value for the <em>step multiplier</em> of
-the collector (see <a href="#2.10">§2.10</a>).
-The function returns the previous value of the step multiplier.
-</li>
-
-</ul>
-
-
-
-
-<hr><h3><a name="lua_getallocf"><code>lua_getallocf</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_Alloc lua_getallocf (lua_State *L, void **ud);</pre>
-
-<p>
-Returns the memory-allocation function of a given state.
-If <code>ud</code> is not <code>NULL</code>, Lua stores in <code>*ud</code> the
-opaque pointer passed to <a href="#lua_newstate"><code>lua_newstate</code></a>.
-
-
-
-
-
-<hr><h3><a name="lua_getfenv"><code>lua_getfenv</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_getfenv (lua_State *L, int index);</pre>
-
-<p>
-Pushes onto the stack the environment table of
-the value at the given index.
-
-
-
-
-
-<hr><h3><a name="lua_getfield"><code>lua_getfield</code></a></h3><p>
-<span class="apii">[-0, +1, <em>e</em>]</span>
-<pre>void lua_getfield (lua_State *L, int index, const char *k);</pre>
-
-<p>
-Pushes onto the stack the value <code>t[k]</code>,
-where <code>t</code> is the value at the given valid index.
-As in Lua, this function may trigger a metamethod
-for the "index" event (see <a href="#2.8">§2.8</a>).
-
-
-
-
-
-<hr><h3><a name="lua_getglobal"><code>lua_getglobal</code></a></h3><p>
-<span class="apii">[-0, +1, <em>e</em>]</span>
-<pre>void lua_getglobal (lua_State *L, const char *name);</pre>
-
-<p>
-Pushes onto the stack the value of the global <code>name</code>.
-It is defined as a macro:
-
-<pre>
- #define lua_getglobal(L,s) lua_getfield(L, LUA_GLOBALSINDEX, s)
-</pre>
-
-
-
-
-<hr><h3><a name="lua_getmetatable"><code>lua_getmetatable</code></a></h3><p>
-<span class="apii">[-0, +(0|1), <em>-</em>]</span>
-<pre>int lua_getmetatable (lua_State *L, int index);</pre>
-
-<p>
-Pushes onto the stack the metatable of the value at the given
-acceptable index.
-If the index is not valid,
-or if the value does not have a metatable,
-the function returns 0 and pushes nothing on the stack.
-
-
-
-
-
-<hr><h3><a name="lua_gettable"><code>lua_gettable</code></a></h3><p>
-<span class="apii">[-1, +1, <em>e</em>]</span>
-<pre>void lua_gettable (lua_State *L, int index);</pre>
-
-<p>
-Pushes onto the stack the value <code>t[k]</code>,
-where <code>t</code> is the value at the given valid index
-and <code>k</code> is the value at the top of the stack.
-
-
-<p>
-This function pops the key from the stack
-(putting the resulting value in its place).
-As in Lua, this function may trigger a metamethod
-for the "index" event (see <a href="#2.8">§2.8</a>).
-
-
-
-
-
-<hr><h3><a name="lua_gettop"><code>lua_gettop</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_gettop (lua_State *L);</pre>
-
-<p>
-Returns the index of the top element in the stack.
-Because indices start at 1,
-this result is equal to the number of elements in the stack
-(and so 0 means an empty stack).
-
-
-
-
-
-<hr><h3><a name="lua_insert"><code>lua_insert</code></a></h3><p>
-<span class="apii">[-1, +1, <em>-</em>]</span>
-<pre>void lua_insert (lua_State *L, int index);</pre>
-
-<p>
-Moves the top element into the given valid index,
-shifting up the elements above this index to open space.
-Cannot be called with a pseudo-index,
-because a pseudo-index is not an actual stack position.
-
-
-
-
-
-<hr><h3><a name="lua_Integer"><code>lua_Integer</code></a></h3>
-<pre>typedef ptrdiff_t lua_Integer;</pre>
-
-<p>
-The type used by the Lua API to represent integral values.
-
-
-<p>
-By default it is a <code>ptrdiff_t</code>,
-which is usually the largest signed integral type the machine handles
-"comfortably".
-
-
-
-
-
-<hr><h3><a name="lua_isboolean"><code>lua_isboolean</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isboolean (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index has type boolean,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_iscfunction"><code>lua_iscfunction</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_iscfunction (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a C function,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isfunction"><code>lua_isfunction</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isfunction (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a function
-(either C or Lua), and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_islightuserdata"><code>lua_islightuserdata</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_islightuserdata (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a light userdata,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isnil"><code>lua_isnil</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isnil (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is <b>nil</b>,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isnone"><code>lua_isnone</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isnone (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the given acceptable index is not valid
-(that is, it refers to an element outside the current stack),
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isnoneornil"><code>lua_isnoneornil</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isnoneornil (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the given acceptable index is not valid
-(that is, it refers to an element outside the current stack)
-or if the value at this index is <b>nil</b>,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isnumber"><code>lua_isnumber</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isnumber (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a number
-or a string convertible to a number,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isstring"><code>lua_isstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isstring (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a string
-or a number (which is always convertible to a string),
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_istable"><code>lua_istable</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_istable (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a table,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isthread"><code>lua_isthread</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isthread (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a thread,
-and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_isuserdata"><code>lua_isuserdata</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_isuserdata (lua_State *L, int index);</pre>
-
-<p>
-Returns 1 if the value at the given acceptable index is a userdata
-(either full or light), and 0 otherwise.
-
-
-
-
-
-<hr><h3><a name="lua_lessthan"><code>lua_lessthan</code></a></h3><p>
-<span class="apii">[-0, +0, <em>e</em>]</span>
-<pre>int lua_lessthan (lua_State *L, int index1, int index2);</pre>
-
-<p>
-Returns 1 if the value at acceptable index <code>index1</code> is smaller
-than the value at acceptable index <code>index2</code>,
-following the semantics of the Lua <code><</code> operator
-(that is, may call metamethods).
-Otherwise returns 0.
-Also returns 0 if any of the indices is non valid.
-
-
-
-
-
-<hr><h3><a name="lua_load"><code>lua_load</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>int lua_load (lua_State *L,
- lua_Reader reader,
- void *data,
- const char *chunkname);</pre>
-
-<p>
-Loads a Lua chunk.
-If there are no errors,
-<a href="#lua_load"><code>lua_load</code></a> pushes the compiled chunk as a Lua
-function on top of the stack.
-Otherwise, it pushes an error message.
-The return values of <a href="#lua_load"><code>lua_load</code></a> are:
-
-<ul>
-
-<li><b>0:</b> no errors;</li>
-
-<li><b><a name="pdf-LUA_ERRSYNTAX"><code>LUA_ERRSYNTAX</code></a>:</b>
-syntax error during pre-compilation;</li>
-
-<li><b><a href="#pdf-LUA_ERRMEM"><code>LUA_ERRMEM</code></a>:</b>
-memory allocation error.</li>
-
-</ul>
-
-<p>
-This function only loads a chunk;
-it does not run it.
-
-
-<p>
-<a href="#lua_load"><code>lua_load</code></a> automatically detects whether the chunk is text or binary,
-and loads it accordingly (see program <code>luac</code>).
-
-
-<p>
-The <a href="#lua_load"><code>lua_load</code></a> function uses a user-supplied <code>reader</code> function
-to read the chunk (see <a href="#lua_Reader"><code>lua_Reader</code></a>).
-The <code>data</code> argument is an opaque value passed to the reader function.
-
-
-<p>
-The <code>chunkname</code> argument gives a name to the chunk,
-which is used for error messages and in debug information (see <a href="#3.8">§3.8</a>).
-
-
-
-
-
-<hr><h3><a name="lua_newstate"><code>lua_newstate</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_State *lua_newstate (lua_Alloc f, void *ud);</pre>
-
-<p>
-Creates a new, independent state.
-Returns <code>NULL</code> if cannot create the state
-(due to lack of memory).
-The argument <code>f</code> is the allocator function;
-Lua does all memory allocation for this state through this function.
-The second argument, <code>ud</code>, is an opaque pointer that Lua
-simply passes to the allocator in every call.
-
-
-
-
-
-<hr><h3><a name="lua_newtable"><code>lua_newtable</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void lua_newtable (lua_State *L);</pre>
-
-<p>
-Creates a new empty table and pushes it onto the stack.
-It is equivalent to <code>lua_createtable(L, 0, 0)</code>.
-
-
-
-
-
-<hr><h3><a name="lua_newthread"><code>lua_newthread</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>lua_State *lua_newthread (lua_State *L);</pre>
-
-<p>
-Creates a new thread, pushes it on the stack,
-and returns a pointer to a <a href="#lua_State"><code>lua_State</code></a> that represents this new thread.
-The new state returned by this function shares with the original state
-all global objects (such as tables),
-but has an independent execution stack.
-
-
-<p>
-There is no explicit function to close or to destroy a thread.
-Threads are subject to garbage collection,
-like any Lua object.
-
-
-
-
-
-<hr><h3><a name="lua_newuserdata"><code>lua_newuserdata</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void *lua_newuserdata (lua_State *L, size_t size);</pre>
-
-<p>
-This function allocates a new block of memory with the given size,
-pushes onto the stack a new full userdata with the block address,
-and returns this address.
-
-
-<p>
-Userdata represent C values in Lua.
-A <em>full userdata</em> represents a block of memory.
-It is an object (like a table):
-you must create it, it can have its own metatable,
-and you can detect when it is being collected.
-A full userdata is only equal to itself (under raw equality).
-
-
-<p>
-When Lua collects a full userdata with a <code>gc</code> metamethod,
-Lua calls the metamethod and marks the userdata as finalized.
-When this userdata is collected again then
-Lua frees its corresponding memory.
-
-
-
-
-
-<hr><h3><a name="lua_next"><code>lua_next</code></a></h3><p>
-<span class="apii">[-1, +(2|0), <em>e</em>]</span>
-<pre>int lua_next (lua_State *L, int index);</pre>
-
-<p>
-Pops a key from the stack,
-and pushes a key-value pair from the table at the given index
-(the "next" pair after the given key).
-If there are no more elements in the table,
-then <a href="#lua_next"><code>lua_next</code></a> returns 0 (and pushes nothing).
-
-
-<p>
-A typical traversal looks like this:
-
-<pre>
- /* table is in the stack at index 't' */
- lua_pushnil(L); /* first key */
- while (lua_next(L, t) != 0) {
- /* uses 'key' (at index -2) and 'value' (at index -1) */
- printf("%s - %s\n",
- lua_typename(L, lua_type(L, -2)),
- lua_typename(L, lua_type(L, -1)));
- /* removes 'value'; keeps 'key' for next iteration */
- lua_pop(L, 1);
- }
-</pre>
-
-<p>
-While traversing a table,
-do not call <a href="#lua_tolstring"><code>lua_tolstring</code></a> directly on a key,
-unless you know that the key is actually a string.
-Recall that <a href="#lua_tolstring"><code>lua_tolstring</code></a> <em>changes</em>
-the value at the given index;
-this confuses the next call to <a href="#lua_next"><code>lua_next</code></a>.
-
-
-
-
-
-<hr><h3><a name="lua_Number"><code>lua_Number</code></a></h3>
-<pre>typedef double lua_Number;</pre>
-
-<p>
-The type of numbers in Lua.
-By default, it is double, but that can be changed in <code>luaconf.h</code>.
-
-
-<p>
-Through the configuration file you can change
-Lua to operate with another type for numbers (e.g., float or long).
-
-
-
-
-
-<hr><h3><a name="lua_objlen"><code>lua_objlen</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>size_t lua_objlen (lua_State *L, int index);</pre>
-
-<p>
-Returns the "length" of the value at the given acceptable index:
-for strings, this is the string length;
-for tables, this is the result of the length operator ('<code>#</code>');
-for userdata, this is the size of the block of memory allocated
-for the userdata;
-for other values, it is 0.
-
-
-
-
-
-<hr><h3><a name="lua_pcall"><code>lua_pcall</code></a></h3><p>
-<span class="apii">[-(nargs + 1), +(nresults|1), <em>-</em>]</span>
-<pre>int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc);</pre>
-
-<p>
-Calls a function in protected mode.
-
-
-<p>
-Both <code>nargs</code> and <code>nresults</code> have the same meaning as
-in <a href="#lua_call"><code>lua_call</code></a>.
-If there are no errors during the call,
-<a href="#lua_pcall"><code>lua_pcall</code></a> behaves exactly like <a href="#lua_call"><code>lua_call</code></a>.
-However, if there is any error,
-<a href="#lua_pcall"><code>lua_pcall</code></a> catches it,
-pushes a single value on the stack (the error message),
-and returns an error code.
-Like <a href="#lua_call"><code>lua_call</code></a>,
-<a href="#lua_pcall"><code>lua_pcall</code></a> always removes the function
-and its arguments from the stack.
-
-
-<p>
-If <code>errfunc</code> is 0,
-then the error message returned on the stack
-is exactly the original error message.
-Otherwise, <code>errfunc</code> is the stack index of an
-<em>error handler function</em>.
-(In the current implementation, this index cannot be a pseudo-index.)
-In case of runtime errors,
-this function will be called with the error message
-and its return value will be the message returned on the stack by <a href="#lua_pcall"><code>lua_pcall</code></a>.
-
-
-<p>
-Typically, the error handler function is used to add more debug
-information to the error message, such as a stack traceback.
-Such information cannot be gathered after the return of <a href="#lua_pcall"><code>lua_pcall</code></a>,
-since by then the stack has unwound.
-
-
-<p>
-The <a href="#lua_pcall"><code>lua_pcall</code></a> function returns 0 in case of success
-or one of the following error codes
-(defined in <code>lua.h</code>):
-
-<ul>
-
-<li><b><a name="pdf-LUA_ERRRUN"><code>LUA_ERRRUN</code></a>:</b>
-a runtime error.
-</li>
-
-<li><b><a name="pdf-LUA_ERRMEM"><code>LUA_ERRMEM</code></a>:</b>
-memory allocation error.
-For such errors, Lua does not call the error handler function.
-</li>
-
-<li><b><a name="pdf-LUA_ERRERR"><code>LUA_ERRERR</code></a>:</b>
-error while running the error handler function.
-</li>
-
-</ul>
-
-
-
-
-<hr><h3><a name="lua_pop"><code>lua_pop</code></a></h3><p>
-<span class="apii">[-n, +0, <em>-</em>]</span>
-<pre>void lua_pop (lua_State *L, int n);</pre>
-
-<p>
-Pops <code>n</code> elements from the stack.
-
-
-
-
-
-<hr><h3><a name="lua_pushboolean"><code>lua_pushboolean</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_pushboolean (lua_State *L, int b);</pre>
-
-<p>
-Pushes a boolean value with value <code>b</code> onto the stack.
-
-
-
-
-
-<hr><h3><a name="lua_pushcclosure"><code>lua_pushcclosure</code></a></h3><p>
-<span class="apii">[-n, +1, <em>m</em>]</span>
-<pre>void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n);</pre>
-
-<p>
-Pushes a new C closure onto the stack.
-
-
-<p>
-When a C function is created,
-it is possible to associate some values with it,
-thus creating a C closure (see <a href="#3.4">§3.4</a>);
-these values are then accessible to the function whenever it is called.
-To associate values with a C function,
-first these values should be pushed onto the stack
-(when there are multiple values, the first value is pushed first).
-Then <a href="#lua_pushcclosure"><code>lua_pushcclosure</code></a>
-is called to create and push the C function onto the stack,
-with the argument <code>n</code> telling how many values should be
-associated with the function.
-<a href="#lua_pushcclosure"><code>lua_pushcclosure</code></a> also pops these values from the stack.
-
-
-<p>
-The maximum value for <code>n</code> is 255.
-
-
-
-
-
-<hr><h3><a name="lua_pushcfunction"><code>lua_pushcfunction</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void lua_pushcfunction (lua_State *L, lua_CFunction f);</pre>
-
-<p>
-Pushes a C function onto the stack.
-This function receives a pointer to a C function
-and pushes onto the stack a Lua value of type <code>function</code> that,
-when called, invokes the corresponding C function.
-
-
-<p>
-Any function to be registered in Lua must
-follow the correct protocol to receive its parameters
-and return its results (see <a href="#lua_CFunction"><code>lua_CFunction</code></a>).
-
-
-<p>
-<code>lua_pushcfunction</code> is defined as a macro:
-
-<pre>
- #define lua_pushcfunction(L,f) lua_pushcclosure(L,f,0)
-</pre>
-
-
-
-
-<hr><h3><a name="lua_pushfstring"><code>lua_pushfstring</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>const char *lua_pushfstring (lua_State *L, const char *fmt, ...);</pre>
-
-<p>
-Pushes onto the stack a formatted string
-and returns a pointer to this string.
-It is similar to the C function <code>sprintf</code>,
-but has some important differences:
-
-<ul>
-
-<li>
-You do not have to allocate space for the result:
-the result is a Lua string and Lua takes care of memory allocation
-(and deallocation, through garbage collection).
-</li>
-
-<li>
-The conversion specifiers are quite restricted.
-There are no flags, widths, or precisions.
-The conversion specifiers can only be
-'<code>%%</code>' (inserts a '<code>%</code>' in the string),
-'<code>%s</code>' (inserts a zero-terminated string, with no size restrictions),
-'<code>%f</code>' (inserts a <a href="#lua_Number"><code>lua_Number</code></a>),
-'<code>%p</code>' (inserts a pointer as a hexadecimal numeral),
-'<code>%d</code>' (inserts an <code>int</code>), and
-'<code>%c</code>' (inserts an <code>int</code> as a character).
-</li>
-
-</ul>
-
-
-
-
-<hr><h3><a name="lua_pushinteger"><code>lua_pushinteger</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_pushinteger (lua_State *L, lua_Integer n);</pre>
-
-<p>
-Pushes a number with value <code>n</code> onto the stack.
-
-
-
-
-
-<hr><h3><a name="lua_pushlightuserdata"><code>lua_pushlightuserdata</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_pushlightuserdata (lua_State *L, void *p);</pre>
-
-<p>
-Pushes a light userdata onto the stack.
-
-
-<p>
-Userdata represent C values in Lua.
-A <em>light userdata</em> represents a pointer.
-It is a value (like a number):
-you do not create it, it has no individual metatable,
-and it is not collected (as it was never created).
-A light userdata is equal to "any"
-light userdata with the same C address.
-
-
-
-
-
-<hr><h3><a name="lua_pushliteral"><code>lua_pushliteral</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void lua_pushliteral (lua_State *L, const char *s);</pre>
-
-<p>
-This macro is equivalent to <a href="#lua_pushlstring"><code>lua_pushlstring</code></a>,
-but can be used only when <code>s</code> is a literal string.
-In these cases, it automatically provides the string length.
-
-
-
-
-
-<hr><h3><a name="lua_pushlstring"><code>lua_pushlstring</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void lua_pushlstring (lua_State *L, const char *s, size_t len);</pre>
-
-<p>
-Pushes the string pointed to by <code>s</code> with size <code>len</code>
-onto the stack.
-Lua makes (or reuses) an internal copy of the given string,
-so the memory at <code>s</code> can be freed or reused immediately after
-the function returns.
-The string can contain embedded zeros.
-
-
-
-
-
-<hr><h3><a name="lua_pushnil"><code>lua_pushnil</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_pushnil (lua_State *L);</pre>
-
-<p>
-Pushes a nil value onto the stack.
-
-
-
-
-
-<hr><h3><a name="lua_pushnumber"><code>lua_pushnumber</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_pushnumber (lua_State *L, lua_Number n);</pre>
-
-<p>
-Pushes a number with value <code>n</code> onto the stack.
-
-
-
-
-
-<hr><h3><a name="lua_pushstring"><code>lua_pushstring</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void lua_pushstring (lua_State *L, const char *s);</pre>
-
-<p>
-Pushes the zero-terminated string pointed to by <code>s</code>
-onto the stack.
-Lua makes (or reuses) an internal copy of the given string,
-so the memory at <code>s</code> can be freed or reused immediately after
-the function returns.
-The string cannot contain embedded zeros;
-it is assumed to end at the first zero.
-
-
-
-
-
-<hr><h3><a name="lua_pushthread"><code>lua_pushthread</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>int lua_pushthread (lua_State *L);</pre>
-
-<p>
-Pushes the thread represented by <code>L</code> onto the stack.
-Returns 1 if this thread is the main thread of its state.
-
-
-
-
-
-<hr><h3><a name="lua_pushvalue"><code>lua_pushvalue</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_pushvalue (lua_State *L, int index);</pre>
-
-<p>
-Pushes a copy of the element at the given valid index
-onto the stack.
-
-
-
-
-
-<hr><h3><a name="lua_pushvfstring"><code>lua_pushvfstring</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>const char *lua_pushvfstring (lua_State *L,
- const char *fmt,
- va_list argp);</pre>
-
-<p>
-Equivalent to <a href="#lua_pushfstring"><code>lua_pushfstring</code></a>, except that it receives a <code>va_list</code>
-instead of a variable number of arguments.
-
-
-
-
-
-<hr><h3><a name="lua_rawequal"><code>lua_rawequal</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_rawequal (lua_State *L, int index1, int index2);</pre>
-
-<p>
-Returns 1 if the two values in acceptable indices <code>index1</code> and
-<code>index2</code> are primitively equal
-(that is, without calling metamethods).
-Otherwise returns 0.
-Also returns 0 if any of the indices are non valid.
-
-
-
-
-
-<hr><h3><a name="lua_rawget"><code>lua_rawget</code></a></h3><p>
-<span class="apii">[-1, +1, <em>-</em>]</span>
-<pre>void lua_rawget (lua_State *L, int index);</pre>
-
-<p>
-Similar to <a href="#lua_gettable"><code>lua_gettable</code></a>, but does a raw access
-(i.e., without metamethods).
-
-
-
-
-
-<hr><h3><a name="lua_rawgeti"><code>lua_rawgeti</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void lua_rawgeti (lua_State *L, int index, int n);</pre>
-
-<p>
-Pushes onto the stack the value <code>t[n]</code>,
-where <code>t</code> is the value at the given valid index.
-The access is raw;
-that is, it does not invoke metamethods.
-
-
-
-
-
-<hr><h3><a name="lua_rawset"><code>lua_rawset</code></a></h3><p>
-<span class="apii">[-2, +0, <em>m</em>]</span>
-<pre>void lua_rawset (lua_State *L, int index);</pre>
-
-<p>
-Similar to <a href="#lua_settable"><code>lua_settable</code></a>, but does a raw assignment
-(i.e., without metamethods).
-
-
-
-
-
-<hr><h3><a name="lua_rawseti"><code>lua_rawseti</code></a></h3><p>
-<span class="apii">[-1, +0, <em>m</em>]</span>
-<pre>void lua_rawseti (lua_State *L, int index, int n);</pre>
-
-<p>
-Does the equivalent of <code>t[n] = v</code>,
-where <code>t</code> is the value at the given valid index
-and <code>v</code> is the value at the top of the stack.
-
-
-<p>
-This function pops the value from the stack.
-The assignment is raw;
-that is, it does not invoke metamethods.
-
-
-
-
-
-<hr><h3><a name="lua_Reader"><code>lua_Reader</code></a></h3>
-<pre>typedef const char * (*lua_Reader) (lua_State *L,
- void *data,
- size_t *size);</pre>
-
-<p>
-The reader function used by <a href="#lua_load"><code>lua_load</code></a>.
-Every time it needs another piece of the chunk,
-<a href="#lua_load"><code>lua_load</code></a> calls the reader,
-passing along its <code>data</code> parameter.
-The reader must return a pointer to a block of memory
-with a new piece of the chunk
-and set <code>size</code> to the block size.
-The block must exist until the reader function is called again.
-To signal the end of the chunk,
-the reader must return <code>NULL</code> or set <code>size</code> to zero.
-The reader function may return pieces of any size greater than zero.
-
-
-
-
-
-<hr><h3><a name="lua_register"><code>lua_register</code></a></h3><p>
-<span class="apii">[-0, +0, <em>e</em>]</span>
-<pre>void lua_register (lua_State *L,
- const char *name,
- lua_CFunction f);</pre>
-
-<p>
-Sets the C function <code>f</code> as the new value of global <code>name</code>.
-It is defined as a macro:
-
-<pre>
- #define lua_register(L,n,f) \
- (lua_pushcfunction(L, f), lua_setglobal(L, n))
-</pre>
-
-
-
-
-<hr><h3><a name="lua_remove"><code>lua_remove</code></a></h3><p>
-<span class="apii">[-1, +0, <em>-</em>]</span>
-<pre>void lua_remove (lua_State *L, int index);</pre>
-
-<p>
-Removes the element at the given valid index,
-shifting down the elements above this index to fill the gap.
-Cannot be called with a pseudo-index,
-because a pseudo-index is not an actual stack position.
-
-
-
-
-
-<hr><h3><a name="lua_replace"><code>lua_replace</code></a></h3><p>
-<span class="apii">[-1, +0, <em>-</em>]</span>
-<pre>void lua_replace (lua_State *L, int index);</pre>
-
-<p>
-Moves the top element into the given position (and pops it),
-without shifting any element
-(therefore replacing the value at the given position).
-
-
-
-
-
-<hr><h3><a name="lua_resume"><code>lua_resume</code></a></h3><p>
-<span class="apii">[-?, +?, <em>-</em>]</span>
-<pre>int lua_resume (lua_State *L, int narg);</pre>
-
-<p>
-Starts and resumes a coroutine in a given thread.
-
-
-<p>
-To start a coroutine, you first create a new thread
-(see <a href="#lua_newthread"><code>lua_newthread</code></a>);
-then you push onto its stack the main function plus any arguments;
-then you call <a href="#lua_resume"><code>lua_resume</code></a>,
-with <code>narg</code> being the number of arguments.
-This call returns when the coroutine suspends or finishes its execution.
-When it returns, the stack contains all values passed to <a href="#lua_yield"><code>lua_yield</code></a>,
-or all values returned by the body function.
-<a href="#lua_resume"><code>lua_resume</code></a> returns
-<a href="#pdf-LUA_YIELD"><code>LUA_YIELD</code></a> if the coroutine yields,
-0 if the coroutine finishes its execution
-without errors,
-or an error code in case of errors (see <a href="#lua_pcall"><code>lua_pcall</code></a>).
-In case of errors,
-the stack is not unwound,
-so you can use the debug API over it.
-The error message is on the top of the stack.
-To restart a coroutine, you put on its stack only the values to
-be passed as results from <code>yield</code>,
-and then call <a href="#lua_resume"><code>lua_resume</code></a>.
-
-
-
-
-
-<hr><h3><a name="lua_setallocf"><code>lua_setallocf</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);</pre>
-
-<p>
-Changes the allocator function of a given state to <code>f</code>
-with user data <code>ud</code>.
-
-
-
-
-
-<hr><h3><a name="lua_setfenv"><code>lua_setfenv</code></a></h3><p>
-<span class="apii">[-1, +0, <em>-</em>]</span>
-<pre>int lua_setfenv (lua_State *L, int index);</pre>
-
-<p>
-Pops a table from the stack and sets it as
-the new environment for the value at the given index.
-If the value at the given index is
-neither a function nor a thread nor a userdata,
-<a href="#lua_setfenv"><code>lua_setfenv</code></a> returns 0.
-Otherwise it returns 1.
-
-
-
-
-
-<hr><h3><a name="lua_setfield"><code>lua_setfield</code></a></h3><p>
-<span class="apii">[-1, +0, <em>e</em>]</span>
-<pre>void lua_setfield (lua_State *L, int index, const char *k);</pre>
-
-<p>
-Does the equivalent to <code>t[k] = v</code>,
-where <code>t</code> is the value at the given valid index
-and <code>v</code> is the value at the top of the stack.
-
-
-<p>
-This function pops the value from the stack.
-As in Lua, this function may trigger a metamethod
-for the "newindex" event (see <a href="#2.8">§2.8</a>).
-
-
-
-
-
-<hr><h3><a name="lua_setglobal"><code>lua_setglobal</code></a></h3><p>
-<span class="apii">[-1, +0, <em>e</em>]</span>
-<pre>void lua_setglobal (lua_State *L, const char *name);</pre>
-
-<p>
-Pops a value from the stack and
-sets it as the new value of global <code>name</code>.
-It is defined as a macro:
-
-<pre>
- #define lua_setglobal(L,s) lua_setfield(L, LUA_GLOBALSINDEX, s)
-</pre>
-
-
-
-
-<hr><h3><a name="lua_setmetatable"><code>lua_setmetatable</code></a></h3><p>
-<span class="apii">[-1, +0, <em>-</em>]</span>
-<pre>int lua_setmetatable (lua_State *L, int index);</pre>
-
-<p>
-Pops a table from the stack and
-sets it as the new metatable for the value at the given
-acceptable index.
-
-
-
-
-
-<hr><h3><a name="lua_settable"><code>lua_settable</code></a></h3><p>
-<span class="apii">[-2, +0, <em>e</em>]</span>
-<pre>void lua_settable (lua_State *L, int index);</pre>
-
-<p>
-Does the equivalent to <code>t[k] = v</code>,
-where <code>t</code> is the value at the given valid index,
-<code>v</code> is the value at the top of the stack,
-and <code>k</code> is the value just below the top.
-
-
-<p>
-This function pops both the key and the value from the stack.
-As in Lua, this function may trigger a metamethod
-for the "newindex" event (see <a href="#2.8">§2.8</a>).
-
-
-
-
-
-<hr><h3><a name="lua_settop"><code>lua_settop</code></a></h3><p>
-<span class="apii">[-?, +?, <em>-</em>]</span>
-<pre>void lua_settop (lua_State *L, int index);</pre>
-
-<p>
-Accepts any acceptable index, or 0,
-and sets the stack top to this index.
-If the new top is larger than the old one,
-then the new elements are filled with <b>nil</b>.
-If <code>index</code> is 0, then all stack elements are removed.
-
-
-
-
-
-<hr><h3><a name="lua_State"><code>lua_State</code></a></h3>
-<pre>typedef struct lua_State lua_State;</pre>
-
-<p>
-Opaque structure that keeps the whole state of a Lua interpreter.
-The Lua library is fully reentrant:
-it has no global variables.
-All information about a state is kept in this structure.
-
-
-<p>
-A pointer to this state must be passed as the first argument to
-every function in the library, except to <a href="#lua_newstate"><code>lua_newstate</code></a>,
-which creates a Lua state from scratch.
-
-
-
-
-
-<hr><h3><a name="lua_status"><code>lua_status</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_status (lua_State *L);</pre>
-
-<p>
-Returns the status of the thread <code>L</code>.
-
-
-<p>
-The status can be 0 for a normal thread,
-an error code if the thread finished its execution with an error,
-or <a name="pdf-LUA_YIELD"><code>LUA_YIELD</code></a> if the thread is suspended.
-
-
-
-
-
-<hr><h3><a name="lua_toboolean"><code>lua_toboolean</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_toboolean (lua_State *L, int index);</pre>
-
-<p>
-Converts the Lua value at the given acceptable index to a C boolean
-value (0 or 1).
-Like all tests in Lua,
-<a href="#lua_toboolean"><code>lua_toboolean</code></a> returns 1 for any Lua value
-different from <b>false</b> and <b>nil</b>;
-otherwise it returns 0.
-It also returns 0 when called with a non-valid index.
-(If you want to accept only actual boolean values,
-use <a href="#lua_isboolean"><code>lua_isboolean</code></a> to test the value's type.)
-
-
-
-
-
-<hr><h3><a name="lua_tocfunction"><code>lua_tocfunction</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_CFunction lua_tocfunction (lua_State *L, int index);</pre>
-
-<p>
-Converts a value at the given acceptable index to a C function.
-That value must be a C function;
-otherwise, returns <code>NULL</code>.
-
-
-
-
-
-<hr><h3><a name="lua_tointeger"><code>lua_tointeger</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_Integer lua_tointeger (lua_State *L, int index);</pre>
-
-<p>
-Converts the Lua value at the given acceptable index
-to the signed integral type <a href="#lua_Integer"><code>lua_Integer</code></a>.
-The Lua value must be a number or a string convertible to a number
-(see <a href="#2.2.1">§2.2.1</a>);
-otherwise, <a href="#lua_tointeger"><code>lua_tointeger</code></a> returns 0.
-
-
-<p>
-If the number is not an integer,
-it is truncated in some non-specified way.
-
-
-
-
-
-<hr><h3><a name="lua_tolstring"><code>lua_tolstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>const char *lua_tolstring (lua_State *L, int index, size_t *len);</pre>
-
-<p>
-Converts the Lua value at the given acceptable index to a C string.
-If <code>len</code> is not <code>NULL</code>,
-it also sets <code>*len</code> with the string length.
-The Lua value must be a string or a number;
-otherwise, the function returns <code>NULL</code>.
-If the value is a number,
-then <a href="#lua_tolstring"><code>lua_tolstring</code></a> also
-<em>changes the actual value in the stack to a string</em>.
-(This change confuses <a href="#lua_next"><code>lua_next</code></a>
-when <a href="#lua_tolstring"><code>lua_tolstring</code></a> is applied to keys during a table traversal.)
-
-
-<p>
-<a href="#lua_tolstring"><code>lua_tolstring</code></a> returns a fully aligned pointer
-to a string inside the Lua state.
-This string always has a zero ('<code>\0</code>')
-after its last character (as in C),
-but can contain other zeros in its body.
-Because Lua has garbage collection,
-there is no guarantee that the pointer returned by <a href="#lua_tolstring"><code>lua_tolstring</code></a>
-will be valid after the corresponding value is removed from the stack.
-
-
-
-
-
-<hr><h3><a name="lua_tonumber"><code>lua_tonumber</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_Number lua_tonumber (lua_State *L, int index);</pre>
-
-<p>
-Converts the Lua value at the given acceptable index
-to the C type <a href="#lua_Number"><code>lua_Number</code></a> (see <a href="#lua_Number"><code>lua_Number</code></a>).
-The Lua value must be a number or a string convertible to a number
-(see <a href="#2.2.1">§2.2.1</a>);
-otherwise, <a href="#lua_tonumber"><code>lua_tonumber</code></a> returns 0.
-
-
-
-
-
-<hr><h3><a name="lua_topointer"><code>lua_topointer</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>const void *lua_topointer (lua_State *L, int index);</pre>
-
-<p>
-Converts the value at the given acceptable index to a generic
-C pointer (<code>void*</code>).
-The value can be a userdata, a table, a thread, or a function;
-otherwise, <a href="#lua_topointer"><code>lua_topointer</code></a> returns <code>NULL</code>.
-Different objects will give different pointers.
-There is no way to convert the pointer back to its original value.
-
-
-<p>
-Typically this function is used only for debug information.
-
-
-
-
-
-<hr><h3><a name="lua_tostring"><code>lua_tostring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>const char *lua_tostring (lua_State *L, int index);</pre>
-
-<p>
-Equivalent to <a href="#lua_tolstring"><code>lua_tolstring</code></a> with <code>len</code> equal to <code>NULL</code>.
-
-
-
-
-
-<hr><h3><a name="lua_tothread"><code>lua_tothread</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_State *lua_tothread (lua_State *L, int index);</pre>
-
-<p>
-Converts the value at the given acceptable index to a Lua thread
-(represented as <code>lua_State*</code>).
-This value must be a thread;
-otherwise, the function returns <code>NULL</code>.
-
-
-
-
-
-<hr><h3><a name="lua_touserdata"><code>lua_touserdata</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>void *lua_touserdata (lua_State *L, int index);</pre>
-
-<p>
-If the value at the given acceptable index is a full userdata,
-returns its block address.
-If the value is a light userdata,
-returns its pointer.
-Otherwise, returns <code>NULL</code>.
-
-
-
-
-
-<hr><h3><a name="lua_type"><code>lua_type</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_type (lua_State *L, int index);</pre>
-
-<p>
-Returns the type of the value in the given acceptable index,
-or <code>LUA_TNONE</code> for a non-valid index
-(that is, an index to an "empty" stack position).
-The types returned by <a href="#lua_type"><code>lua_type</code></a> are coded by the following constants
-defined in <code>lua.h</code>:
-<code>LUA_TNIL</code>,
-<code>LUA_TNUMBER</code>,
-<code>LUA_TBOOLEAN</code>,
-<code>LUA_TSTRING</code>,
-<code>LUA_TTABLE</code>,
-<code>LUA_TFUNCTION</code>,
-<code>LUA_TUSERDATA</code>,
-<code>LUA_TTHREAD</code>,
-and
-<code>LUA_TLIGHTUSERDATA</code>.
-
-
-
-
-
-<hr><h3><a name="lua_typename"><code>lua_typename</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>const char *lua_typename (lua_State *L, int tp);</pre>
-
-<p>
-Returns the name of the type encoded by the value <code>tp</code>,
-which must be one the values returned by <a href="#lua_type"><code>lua_type</code></a>.
-
-
-
-
-
-<hr><h3><a name="lua_Writer"><code>lua_Writer</code></a></h3>
-<pre>typedef int (*lua_Writer) (lua_State *L,
- const void* p,
- size_t sz,
- void* ud);</pre>
-
-<p>
-The type of the writer function used by <a href="#lua_dump"><code>lua_dump</code></a>.
-Every time it produces another piece of chunk,
-<a href="#lua_dump"><code>lua_dump</code></a> calls the writer,
-passing along the buffer to be written (<code>p</code>),
-its size (<code>sz</code>),
-and the <code>data</code> parameter supplied to <a href="#lua_dump"><code>lua_dump</code></a>.
-
-
-<p>
-The writer returns an error code:
-0 means no errors;
-any other value means an error and stops <a href="#lua_dump"><code>lua_dump</code></a> from
-calling the writer again.
-
-
-
-
-
-<hr><h3><a name="lua_xmove"><code>lua_xmove</code></a></h3><p>
-<span class="apii">[-?, +?, <em>-</em>]</span>
-<pre>void lua_xmove (lua_State *from, lua_State *to, int n);</pre>
-
-<p>
-Exchange values between different threads of the <em>same</em> global state.
-
-
-<p>
-This function pops <code>n</code> values from the stack <code>from</code>,
-and pushes them onto the stack <code>to</code>.
-
-
-
-
-
-<hr><h3><a name="lua_yield"><code>lua_yield</code></a></h3><p>
-<span class="apii">[-?, +?, <em>-</em>]</span>
-<pre>int lua_yield (lua_State *L, int nresults);</pre>
-
-<p>
-Yields a coroutine.
-
-
-<p>
-This function should only be called as the
-return expression of a C function, as follows:
-
-<pre>
- return lua_yield (L, nresults);
-</pre><p>
-When a C function calls <a href="#lua_yield"><code>lua_yield</code></a> in that way,
-the running coroutine suspends its execution,
-and the call to <a href="#lua_resume"><code>lua_resume</code></a> that started this coroutine returns.
-The parameter <code>nresults</code> is the number of values from the stack
-that are passed as results to <a href="#lua_resume"><code>lua_resume</code></a>.
-
-
-
-
-
-
-
-<h2>3.8 - <a name="3.8">The Debug Interface</a></h2>
-
-<p>
-Lua has no built-in debugging facilities.
-Instead, it offers a special interface
-by means of functions and <em>hooks</em>.
-This interface allows the construction of different
-kinds of debuggers, profilers, and other tools
-that need "inside information" from the interpreter.
-
-
-
-<hr><h3><a name="lua_Debug"><code>lua_Debug</code></a></h3>
-<pre>typedef struct lua_Debug {
- int event;
- const char *name; /* (n) */
- const char *namewhat; /* (n) */
- const char *what; /* (S) */
- const char *source; /* (S) */
- int currentline; /* (l) */
- int nups; /* (u) number of upvalues */
- int linedefined; /* (S) */
- int lastlinedefined; /* (S) */
- char short_src[LUA_IDSIZE]; /* (S) */
- /* private part */
- <em>other fields</em>
-} lua_Debug;</pre>
-
-<p>
-A structure used to carry different pieces of
-information about an active function.
-<a href="#lua_getstack"><code>lua_getstack</code></a> fills only the private part
-of this structure, for later use.
-To fill the other fields of <a href="#lua_Debug"><code>lua_Debug</code></a> with useful information,
-call <a href="#lua_getinfo"><code>lua_getinfo</code></a>.
-
-
-<p>
-The fields of <a href="#lua_Debug"><code>lua_Debug</code></a> have the following meaning:
-
-<ul>
-
-<li><b><code>source</code>:</b>
-If the function was defined in a string,
-then <code>source</code> is that string.
-If the function was defined in a file,
-then <code>source</code> starts with a '<code>@</code>' followed by the file name.
-</li>
-
-<li><b><code>short_src</code>:</b>
-a "printable" version of <code>source</code>, to be used in error messages.
-</li>
-
-<li><b><code>linedefined</code>:</b>
-the line number where the definition of the function starts.
-</li>
-
-<li><b><code>lastlinedefined</code>:</b>
-the line number where the definition of the function ends.
-</li>
-
-<li><b><code>what</code>:</b>
-the string <code>"Lua"</code> if the function is a Lua function,
-<code>"C"</code> if it is a C function,
-<code>"main"</code> if it is the main part of a chunk,
-and <code>"tail"</code> if it was a function that did a tail call.
-In the latter case,
-Lua has no other information about the function.
-</li>
-
-<li><b><code>currentline</code>:</b>
-the current line where the given function is executing.
-When no line information is available,
-<code>currentline</code> is set to -1.
-</li>
-
-<li><b><code>name</code>:</b>
-a reasonable name for the given function.
-Because functions in Lua are first-class values,
-they do not have a fixed name:
-some functions can be the value of multiple global variables,
-while others can be stored only in a table field.
-The <code>lua_getinfo</code> function checks how the function was
-called to find a suitable name.
-If it cannot find a name,
-then <code>name</code> is set to <code>NULL</code>.
-</li>
-
-<li><b><code>namewhat</code>:</b>
-explains the <code>name</code> field.
-The value of <code>namewhat</code> can be
-<code>"global"</code>, <code>"local"</code>, <code>"method"</code>,
-<code>"field"</code>, <code>"upvalue"</code>, or <code>""</code> (the empty string),
-according to how the function was called.
-(Lua uses the empty string when no other option seems to apply.)
-</li>
-
-<li><b><code>nups</code>:</b>
-the number of upvalues of the function.
-</li>
-
-</ul>
-
-
-
-
-<hr><h3><a name="lua_gethook"><code>lua_gethook</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_Hook lua_gethook (lua_State *L);</pre>
-
-<p>
-Returns the current hook function.
-
-
-
-
-
-<hr><h3><a name="lua_gethookcount"><code>lua_gethookcount</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_gethookcount (lua_State *L);</pre>
-
-<p>
-Returns the current hook count.
-
-
-
-
-
-<hr><h3><a name="lua_gethookmask"><code>lua_gethookmask</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_gethookmask (lua_State *L);</pre>
-
-<p>
-Returns the current hook mask.
-
-
-
-
-
-<hr><h3><a name="lua_getinfo"><code>lua_getinfo</code></a></h3><p>
-<span class="apii">[-(0|1), +(0|1|2), <em>m</em>]</span>
-<pre>int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);</pre>
-
-<p>
-Returns information about a specific function or function invocation.
-
-
-<p>
-To get information about a function invocation,
-the parameter <code>ar</code> must be a valid activation record that was
-filled by a previous call to <a href="#lua_getstack"><code>lua_getstack</code></a> or
-given as argument to a hook (see <a href="#lua_Hook"><code>lua_Hook</code></a>).
-
-
-<p>
-To get information about a function you push it onto the stack
-and start the <code>what</code> string with the character '<code>></code>'.
-(In that case,
-<code>lua_getinfo</code> pops the function in the top of the stack.)
-For instance, to know in which line a function <code>f</code> was defined,
-you can write the following code:
-
-<pre>
- lua_Debug ar;
- lua_getfield(L, LUA_GLOBALSINDEX, "f"); /* get global 'f' */
- lua_getinfo(L, ">S", &ar);
- printf("%d\n", ar.linedefined);
-</pre>
-
-<p>
-Each character in the string <code>what</code>
-selects some fields of the structure <code>ar</code> to be filled or
-a value to be pushed on the stack:
-
-<ul>
-
-<li><b>'<code>n</code>':</b> fills in the field <code>name</code> and <code>namewhat</code>;
-</li>
-
-<li><b>'<code>S</code>':</b>
-fills in the fields <code>source</code>, <code>short_src</code>,
-<code>linedefined</code>, <code>lastlinedefined</code>, and <code>what</code>;
-</li>
-
-<li><b>'<code>l</code>':</b> fills in the field <code>currentline</code>;
-</li>
-
-<li><b>'<code>u</code>':</b> fills in the field <code>nups</code>;
-</li>
-
-<li><b>'<code>f</code>':</b>
-pushes onto the stack the function that is
-running at the given level;
-</li>
-
-<li><b>'<code>L</code>':</b>
-pushes onto the stack a table whose indices are the
-numbers of the lines that are valid on the function.
-(A <em>valid line</em> is a line with some associated code,
-that is, a line where you can put a break point.
-Non-valid lines include empty lines and comments.)
-</li>
-
-</ul>
-
-<p>
-This function returns 0 on error
-(for instance, an invalid option in <code>what</code>).
-
-
-
-
-
-<hr><h3><a name="lua_getlocal"><code>lua_getlocal</code></a></h3><p>
-<span class="apii">[-0, +(0|1), <em>-</em>]</span>
-<pre>const char *lua_getlocal (lua_State *L, lua_Debug *ar, int n);</pre>
-
-<p>
-Gets information about a local variable of a given activation record.
-The parameter <code>ar</code> must be a valid activation record that was
-filled by a previous call to <a href="#lua_getstack"><code>lua_getstack</code></a> or
-given as argument to a hook (see <a href="#lua_Hook"><code>lua_Hook</code></a>).
-The index <code>n</code> selects which local variable to inspect
-(1 is the first parameter or active local variable, and so on,
-until the last active local variable).
-<a href="#lua_getlocal"><code>lua_getlocal</code></a> pushes the variable's value onto the stack
-and returns its name.
-
-
-<p>
-Variable names starting with '<code>(</code>' (open parentheses)
-represent internal variables
-(loop control variables, temporaries, and C function locals).
-
-
-<p>
-Returns <code>NULL</code> (and pushes nothing)
-when the index is greater than
-the number of active local variables.
-
-
-
-
-
-<hr><h3><a name="lua_getstack"><code>lua_getstack</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_getstack (lua_State *L, int level, lua_Debug *ar);</pre>
-
-<p>
-Get information about the interpreter runtime stack.
-
-
-<p>
-This function fills parts of a <a href="#lua_Debug"><code>lua_Debug</code></a> structure with
-an identification of the <em>activation record</em>
-of the function executing at a given level.
-Level 0 is the current running function,
-whereas level <em>n+1</em> is the function that has called level <em>n</em>.
-When there are no errors, <a href="#lua_getstack"><code>lua_getstack</code></a> returns 1;
-when called with a level greater than the stack depth,
-it returns 0.
-
-
-
-
-
-<hr><h3><a name="lua_getupvalue"><code>lua_getupvalue</code></a></h3><p>
-<span class="apii">[-0, +(0|1), <em>-</em>]</span>
-<pre>const char *lua_getupvalue (lua_State *L, int funcindex, int n);</pre>
-
-<p>
-Gets information about a closure's upvalue.
-(For Lua functions,
-upvalues are the external local variables that the function uses,
-and that are consequently included in its closure.)
-<a href="#lua_getupvalue"><code>lua_getupvalue</code></a> gets the index <code>n</code> of an upvalue,
-pushes the upvalue's value onto the stack,
-and returns its name.
-<code>funcindex</code> points to the closure in the stack.
-(Upvalues have no particular order,
-as they are active through the whole function.
-So, they are numbered in an arbitrary order.)
-
-
-<p>
-Returns <code>NULL</code> (and pushes nothing)
-when the index is greater than the number of upvalues.
-For C functions, this function uses the empty string <code>""</code>
-as a name for all upvalues.
-
-
-
-
-
-<hr><h3><a name="lua_Hook"><code>lua_Hook</code></a></h3>
-<pre>typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);</pre>
-
-<p>
-Type for debugging hook functions.
-
-
-<p>
-Whenever a hook is called, its <code>ar</code> argument has its field
-<code>event</code> set to the specific event that triggered the hook.
-Lua identifies these events with the following constants:
-<a name="pdf-LUA_HOOKCALL"><code>LUA_HOOKCALL</code></a>, <a name="pdf-LUA_HOOKRET"><code>LUA_HOOKRET</code></a>,
-<a name="pdf-LUA_HOOKTAILRET"><code>LUA_HOOKTAILRET</code></a>, <a name="pdf-LUA_HOOKLINE"><code>LUA_HOOKLINE</code></a>,
-and <a name="pdf-LUA_HOOKCOUNT"><code>LUA_HOOKCOUNT</code></a>.
-Moreover, for line events, the field <code>currentline</code> is also set.
-To get the value of any other field in <code>ar</code>,
-the hook must call <a href="#lua_getinfo"><code>lua_getinfo</code></a>.
-For return events, <code>event</code> can be <code>LUA_HOOKRET</code>,
-the normal value, or <code>LUA_HOOKTAILRET</code>.
-In the latter case, Lua is simulating a return from
-a function that did a tail call;
-in this case, it is useless to call <a href="#lua_getinfo"><code>lua_getinfo</code></a>.
-
-
-<p>
-While Lua is running a hook, it disables other calls to hooks.
-Therefore, if a hook calls back Lua to execute a function or a chunk,
-this execution occurs without any calls to hooks.
-
-
-
-
-
-<hr><h3><a name="lua_sethook"><code>lua_sethook</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>int lua_sethook (lua_State *L, lua_Hook f, int mask, int count);</pre>
-
-<p>
-Sets the debugging hook function.
-
-
-<p>
-Argument <code>f</code> is the hook function.
-<code>mask</code> specifies on which events the hook will be called:
-it is formed by a bitwise or of the constants
-<a name="pdf-LUA_MASKCALL"><code>LUA_MASKCALL</code></a>,
-<a name="pdf-LUA_MASKRET"><code>LUA_MASKRET</code></a>,
-<a name="pdf-LUA_MASKLINE"><code>LUA_MASKLINE</code></a>,
-and <a name="pdf-LUA_MASKCOUNT"><code>LUA_MASKCOUNT</code></a>.
-The <code>count</code> argument is only meaningful when the mask
-includes <code>LUA_MASKCOUNT</code>.
-For each event, the hook is called as explained below:
-
-<ul>
-
-<li><b>The call hook:</b> is called when the interpreter calls a function.
-The hook is called just after Lua enters the new function,
-before the function gets its arguments.
-</li>
-
-<li><b>The return hook:</b> is called when the interpreter returns from a function.
-The hook is called just before Lua leaves the function.
-You have no access to the values to be returned by the function.
-</li>
-
-<li><b>The line hook:</b> is called when the interpreter is about to
-start the execution of a new line of code,
-or when it jumps back in the code (even to the same line).
-(This event only happens while Lua is executing a Lua function.)
-</li>
-
-<li><b>The count hook:</b> is called after the interpreter executes every
-<code>count</code> instructions.
-(This event only happens while Lua is executing a Lua function.)
-</li>
-
-</ul>
-
-<p>
-A hook is disabled by setting <code>mask</code> to zero.
-
-
-
-
-
-<hr><h3><a name="lua_setlocal"><code>lua_setlocal</code></a></h3><p>
-<span class="apii">[-(0|1), +0, <em>-</em>]</span>
-<pre>const char *lua_setlocal (lua_State *L, lua_Debug *ar, int n);</pre>
-
-<p>
-Sets the value of a local variable of a given activation record.
-Parameters <code>ar</code> and <code>n</code> are as in <a href="#lua_getlocal"><code>lua_getlocal</code></a>
-(see <a href="#lua_getlocal"><code>lua_getlocal</code></a>).
-<a href="#lua_setlocal"><code>lua_setlocal</code></a> assigns the value at the top of the stack
-to the variable and returns its name.
-It also pops the value from the stack.
-
-
-<p>
-Returns <code>NULL</code> (and pops nothing)
-when the index is greater than
-the number of active local variables.
-
-
-
-
-
-<hr><h3><a name="lua_setupvalue"><code>lua_setupvalue</code></a></h3><p>
-<span class="apii">[-(0|1), +0, <em>-</em>]</span>
-<pre>const char *lua_setupvalue (lua_State *L, int funcindex, int n);</pre>
-
-<p>
-Sets the value of a closure's upvalue.
-It assigns the value at the top of the stack
-to the upvalue and returns its name.
-It also pops the value from the stack.
-Parameters <code>funcindex</code> and <code>n</code> are as in the <a href="#lua_getupvalue"><code>lua_getupvalue</code></a>
-(see <a href="#lua_getupvalue"><code>lua_getupvalue</code></a>).
-
-
-<p>
-Returns <code>NULL</code> (and pops nothing)
-when the index is greater than the number of upvalues.
-
-
-
-
-
-
-
-<h1>4 - <a name="4">The Auxiliary Library</a></h1>
-
-<p>
-
-The <em>auxiliary library</em> provides several convenient functions
-to interface C with Lua.
-While the basic API provides the primitive functions for all
-interactions between C and Lua,
-the auxiliary library provides higher-level functions for some
-common tasks.
-
-
-<p>
-All functions from the auxiliary library
-are defined in header file <code>lauxlib.h</code> and
-have a prefix <code>luaL_</code>.
-
-
-<p>
-All functions in the auxiliary library are built on
-top of the basic API,
-and so they provide nothing that cannot be done with this API.
-
-
-<p>
-Several functions in the auxiliary library are used to
-check C function arguments.
-Their names are always <code>luaL_check*</code> or <code>luaL_opt*</code>.
-All of these functions throw an error if the check is not satisfied.
-Because the error message is formatted for arguments
-(e.g., "<code>bad argument #1</code>"),
-you should not use these functions for other stack values.
-
-
-
-<h2>4.1 - <a name="4.1">Functions and Types</a></h2>
-
-<p>
-Here we list all functions and types from the auxiliary library
-in alphabetical order.
-
-
-
-<hr><h3><a name="luaL_addchar"><code>luaL_addchar</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>void luaL_addchar (luaL_Buffer *B, char c);</pre>
-
-<p>
-Adds the character <code>c</code> to the buffer <code>B</code>
-(see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>).
-
-
-
-
-
-<hr><h3><a name="luaL_addlstring"><code>luaL_addlstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l);</pre>
-
-<p>
-Adds the string pointed to by <code>s</code> with length <code>l</code> to
-the buffer <code>B</code>
-(see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>).
-The string may contain embedded zeros.
-
-
-
-
-
-<hr><h3><a name="luaL_addsize"><code>luaL_addsize</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>void luaL_addsize (luaL_Buffer *B, size_t n);</pre>
-
-<p>
-Adds to the buffer <code>B</code> (see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>)
-a string of length <code>n</code> previously copied to the
-buffer area (see <a href="#luaL_prepbuffer"><code>luaL_prepbuffer</code></a>).
-
-
-
-
-
-<hr><h3><a name="luaL_addstring"><code>luaL_addstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>void luaL_addstring (luaL_Buffer *B, const char *s);</pre>
-
-<p>
-Adds the zero-terminated string pointed to by <code>s</code>
-to the buffer <code>B</code>
-(see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>).
-The string may not contain embedded zeros.
-
-
-
-
-
-<hr><h3><a name="luaL_addvalue"><code>luaL_addvalue</code></a></h3><p>
-<span class="apii">[-1, +0, <em>m</em>]</span>
-<pre>void luaL_addvalue (luaL_Buffer *B);</pre>
-
-<p>
-Adds the value at the top of the stack
-to the buffer <code>B</code>
-(see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>).
-Pops the value.
-
-
-<p>
-This is the only function on string buffers that can (and must)
-be called with an extra element on the stack,
-which is the value to be added to the buffer.
-
-
-
-
-
-<hr><h3><a name="luaL_argcheck"><code>luaL_argcheck</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>void luaL_argcheck (lua_State *L,
- int cond,
- int narg,
- const char *extramsg);</pre>
-
-<p>
-Checks whether <code>cond</code> is true.
-If not, raises an error with the following message,
-where <code>func</code> is retrieved from the call stack:
-
-<pre>
- bad argument #<narg> to <func> (<extramsg>)
-</pre>
-
-
-
-
-<hr><h3><a name="luaL_argerror"><code>luaL_argerror</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>int luaL_argerror (lua_State *L, int narg, const char *extramsg);</pre>
-
-<p>
-Raises an error with the following message,
-where <code>func</code> is retrieved from the call stack:
-
-<pre>
- bad argument #<narg> to <func> (<extramsg>)
-</pre>
-
-<p>
-This function never returns,
-but it is an idiom to use it in C functions
-as <code>return luaL_argerror(<em>args</em>)</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_Buffer"><code>luaL_Buffer</code></a></h3>
-<pre>typedef struct luaL_Buffer luaL_Buffer;</pre>
-
-<p>
-Type for a <em>string buffer</em>.
-
-
-<p>
-A string buffer allows C code to build Lua strings piecemeal.
-Its pattern of use is as follows:
-
-<ul>
-
-<li>First you declare a variable <code>b</code> of type <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>.</li>
-
-<li>Then you initialize it with a call <code>luaL_buffinit(L, &b)</code>.</li>
-
-<li>
-Then you add string pieces to the buffer calling any of
-the <code>luaL_add*</code> functions.
-</li>
-
-<li>
-You finish by calling <code>luaL_pushresult(&b)</code>.
-This call leaves the final string on the top of the stack.
-</li>
-
-</ul>
-
-<p>
-During its normal operation,
-a string buffer uses a variable number of stack slots.
-So, while using a buffer, you cannot assume that you know where
-the top of the stack is.
-You can use the stack between successive calls to buffer operations
-as long as that use is balanced;
-that is,
-when you call a buffer operation,
-the stack is at the same level
-it was immediately after the previous buffer operation.
-(The only exception to this rule is <a href="#luaL_addvalue"><code>luaL_addvalue</code></a>.)
-After calling <a href="#luaL_pushresult"><code>luaL_pushresult</code></a> the stack is back to its
-level when the buffer was initialized,
-plus the final string on its top.
-
-
-
-
-
-<hr><h3><a name="luaL_buffinit"><code>luaL_buffinit</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>void luaL_buffinit (lua_State *L, luaL_Buffer *B);</pre>
-
-<p>
-Initializes a buffer <code>B</code>.
-This function does not allocate any space;
-the buffer must be declared as a variable
-(see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>).
-
-
-
-
-
-<hr><h3><a name="luaL_callmeta"><code>luaL_callmeta</code></a></h3><p>
-<span class="apii">[-0, +(0|1), <em>e</em>]</span>
-<pre>int luaL_callmeta (lua_State *L, int obj, const char *e);</pre>
-
-<p>
-Calls a metamethod.
-
-
-<p>
-If the object at index <code>obj</code> has a metatable and this
-metatable has a field <code>e</code>,
-this function calls this field and passes the object as its only argument.
-In this case this function returns 1 and pushes onto the
-stack the value returned by the call.
-If there is no metatable or no metamethod,
-this function returns 0 (without pushing any value on the stack).
-
-
-
-
-
-<hr><h3><a name="luaL_checkany"><code>luaL_checkany</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>void luaL_checkany (lua_State *L, int narg);</pre>
-
-<p>
-Checks whether the function has an argument
-of any type (including <b>nil</b>) at position <code>narg</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_checkint"><code>luaL_checkint</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>int luaL_checkint (lua_State *L, int narg);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a number
-and returns this number cast to an <code>int</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_checkinteger"><code>luaL_checkinteger</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>lua_Integer luaL_checkinteger (lua_State *L, int narg);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a number
-and returns this number cast to a <a href="#lua_Integer"><code>lua_Integer</code></a>.
-
-
-
-
-
-<hr><h3><a name="luaL_checklong"><code>luaL_checklong</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>long luaL_checklong (lua_State *L, int narg);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a number
-and returns this number cast to a <code>long</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_checklstring"><code>luaL_checklstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>const char *luaL_checklstring (lua_State *L, int narg, size_t *l);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a string
-and returns this string;
-if <code>l</code> is not <code>NULL</code> fills <code>*l</code>
-with the string's length.
-
-
-<p>
-This function uses <a href="#lua_tolstring"><code>lua_tolstring</code></a> to get its result,
-so all conversions and caveats of that function apply here.
-
-
-
-
-
-<hr><h3><a name="luaL_checknumber"><code>luaL_checknumber</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>lua_Number luaL_checknumber (lua_State *L, int narg);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a number
-and returns this number.
-
-
-
-
-
-<hr><h3><a name="luaL_checkoption"><code>luaL_checkoption</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>int luaL_checkoption (lua_State *L,
- int narg,
- const char *def,
- const char *const lst[]);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a string and
-searches for this string in the array <code>lst</code>
-(which must be NULL-terminated).
-Returns the index in the array where the string was found.
-Raises an error if the argument is not a string or
-if the string cannot be found.
-
-
-<p>
-If <code>def</code> is not <code>NULL</code>,
-the function uses <code>def</code> as a default value when
-there is no argument <code>narg</code> or if this argument is <b>nil</b>.
-
-
-<p>
-This is a useful function for mapping strings to C enums.
-(The usual convention in Lua libraries is
-to use strings instead of numbers to select options.)
-
-
-
-
-
-<hr><h3><a name="luaL_checkstack"><code>luaL_checkstack</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>void luaL_checkstack (lua_State *L, int sz, const char *msg);</pre>
-
-<p>
-Grows the stack size to <code>top + sz</code> elements,
-raising an error if the stack cannot grow to that size.
-<code>msg</code> is an additional text to go into the error message.
-
-
-
-
-
-<hr><h3><a name="luaL_checkstring"><code>luaL_checkstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>const char *luaL_checkstring (lua_State *L, int narg);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a string
-and returns this string.
-
-
-<p>
-This function uses <a href="#lua_tolstring"><code>lua_tolstring</code></a> to get its result,
-so all conversions and caveats of that function apply here.
-
-
-
-
-
-<hr><h3><a name="luaL_checktype"><code>luaL_checktype</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>void luaL_checktype (lua_State *L, int narg, int t);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> has type <code>t</code>.
-See <a href="#lua_type"><code>lua_type</code></a> for the encoding of types for <code>t</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_checkudata"><code>luaL_checkudata</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>void *luaL_checkudata (lua_State *L, int narg, const char *tname);</pre>
-
-<p>
-Checks whether the function argument <code>narg</code> is a userdata
-of the type <code>tname</code> (see <a href="#luaL_newmetatable"><code>luaL_newmetatable</code></a>).
-
-
-
-
-
-<hr><h3><a name="luaL_dofile"><code>luaL_dofile</code></a></h3><p>
-<span class="apii">[-0, +?, <em>m</em>]</span>
-<pre>int luaL_dofile (lua_State *L, const char *filename);</pre>
-
-<p>
-Loads and runs the given file.
-It is defined as the following macro:
-
-<pre>
- (luaL_loadfile(L, filename) || lua_pcall(L, 0, LUA_MULTRET, 0))
-</pre><p>
-It returns 0 if there are no errors
-or 1 in case of errors.
-
-
-
-
-
-<hr><h3><a name="luaL_dostring"><code>luaL_dostring</code></a></h3><p>
-<span class="apii">[-0, +?, <em>m</em>]</span>
-<pre>int luaL_dostring (lua_State *L, const char *str);</pre>
-
-<p>
-Loads and runs the given string.
-It is defined as the following macro:
-
-<pre>
- (luaL_loadstring(L, str) || lua_pcall(L, 0, LUA_MULTRET, 0))
-</pre><p>
-It returns 0 if there are no errors
-or 1 in case of errors.
-
-
-
-
-
-<hr><h3><a name="luaL_error"><code>luaL_error</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>int luaL_error (lua_State *L, const char *fmt, ...);</pre>
-
-<p>
-Raises an error.
-The error message format is given by <code>fmt</code>
-plus any extra arguments,
-following the same rules of <a href="#lua_pushfstring"><code>lua_pushfstring</code></a>.
-It also adds at the beginning of the message the file name and
-the line number where the error occurred,
-if this information is available.
-
-
-<p>
-This function never returns,
-but it is an idiom to use it in C functions
-as <code>return luaL_error(<em>args</em>)</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_getmetafield"><code>luaL_getmetafield</code></a></h3><p>
-<span class="apii">[-0, +(0|1), <em>m</em>]</span>
-<pre>int luaL_getmetafield (lua_State *L, int obj, const char *e);</pre>
-
-<p>
-Pushes onto the stack the field <code>e</code> from the metatable
-of the object at index <code>obj</code>.
-If the object does not have a metatable,
-or if the metatable does not have this field,
-returns 0 and pushes nothing.
-
-
-
-
-
-<hr><h3><a name="luaL_getmetatable"><code>luaL_getmetatable</code></a></h3><p>
-<span class="apii">[-0, +1, <em>-</em>]</span>
-<pre>void luaL_getmetatable (lua_State *L, const char *tname);</pre>
-
-<p>
-Pushes onto the stack the metatable associated with name <code>tname</code>
-in the registry (see <a href="#luaL_newmetatable"><code>luaL_newmetatable</code></a>).
-
-
-
-
-
-<hr><h3><a name="luaL_gsub"><code>luaL_gsub</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>const char *luaL_gsub (lua_State *L,
- const char *s,
- const char *p,
- const char *r);</pre>
-
-<p>
-Creates a copy of string <code>s</code> by replacing
-any occurrence of the string <code>p</code>
-with the string <code>r</code>.
-Pushes the resulting string on the stack and returns it.
-
-
-
-
-
-<hr><h3><a name="luaL_loadbuffer"><code>luaL_loadbuffer</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>int luaL_loadbuffer (lua_State *L,
- const char *buff,
- size_t sz,
- const char *name);</pre>
-
-<p>
-Loads a buffer as a Lua chunk.
-This function uses <a href="#lua_load"><code>lua_load</code></a> to load the chunk in the
-buffer pointed to by <code>buff</code> with size <code>sz</code>.
-
-
-<p>
-This function returns the same results as <a href="#lua_load"><code>lua_load</code></a>.
-<code>name</code> is the chunk name,
-used for debug information and error messages.
-
-
-
-
-
-<hr><h3><a name="luaL_loadfile"><code>luaL_loadfile</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>int luaL_loadfile (lua_State *L, const char *filename);</pre>
-
-<p>
-Loads a file as a Lua chunk.
-This function uses <a href="#lua_load"><code>lua_load</code></a> to load the chunk in the file
-named <code>filename</code>.
-If <code>filename</code> is <code>NULL</code>,
-then it loads from the standard input.
-The first line in the file is ignored if it starts with a <code>#</code>.
-
-
-<p>
-This function returns the same results as <a href="#lua_load"><code>lua_load</code></a>,
-but it has an extra error code <a name="pdf-LUA_ERRFILE"><code>LUA_ERRFILE</code></a>
-if it cannot open/read the file.
-
-
-<p>
-As <a href="#lua_load"><code>lua_load</code></a>, this function only loads the chunk;
-it does not run it.
-
-
-
-
-
-<hr><h3><a name="luaL_loadstring"><code>luaL_loadstring</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>int luaL_loadstring (lua_State *L, const char *s);</pre>
-
-<p>
-Loads a string as a Lua chunk.
-This function uses <a href="#lua_load"><code>lua_load</code></a> to load the chunk in
-the zero-terminated string <code>s</code>.
-
-
-<p>
-This function returns the same results as <a href="#lua_load"><code>lua_load</code></a>.
-
-
-<p>
-Also as <a href="#lua_load"><code>lua_load</code></a>, this function only loads the chunk;
-it does not run it.
-
-
-
-
-
-<hr><h3><a name="luaL_newmetatable"><code>luaL_newmetatable</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>int luaL_newmetatable (lua_State *L, const char *tname);</pre>
-
-<p>
-If the registry already has the key <code>tname</code>,
-returns 0.
-Otherwise,
-creates a new table to be used as a metatable for userdata,
-adds it to the registry with key <code>tname</code>,
-and returns 1.
-
-
-<p>
-In both cases pushes onto the stack the final value associated
-with <code>tname</code> in the registry.
-
-
-
-
-
-<hr><h3><a name="luaL_newstate"><code>luaL_newstate</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>lua_State *luaL_newstate (void);</pre>
-
-<p>
-Creates a new Lua state.
-It calls <a href="#lua_newstate"><code>lua_newstate</code></a> with an
-allocator based on the standard C <code>realloc</code> function
-and then sets a panic function (see <a href="#lua_atpanic"><code>lua_atpanic</code></a>) that prints
-an error message to the standard error output in case of fatal
-errors.
-
-
-<p>
-Returns the new state,
-or <code>NULL</code> if there is a memory allocation error.
-
-
-
-
-
-<hr><h3><a name="luaL_openlibs"><code>luaL_openlibs</code></a></h3><p>
-<span class="apii">[-0, +0, <em>m</em>]</span>
-<pre>void luaL_openlibs (lua_State *L);</pre>
-
-<p>
-Opens all standard Lua libraries into the given state.
-
-
-
-
-
-<hr><h3><a name="luaL_optint"><code>luaL_optint</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>int luaL_optint (lua_State *L, int narg, int d);</pre>
-
-<p>
-If the function argument <code>narg</code> is a number,
-returns this number cast to an <code>int</code>.
-If this argument is absent or is <b>nil</b>,
-returns <code>d</code>.
-Otherwise, raises an error.
-
-
-
-
-
-<hr><h3><a name="luaL_optinteger"><code>luaL_optinteger</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>lua_Integer luaL_optinteger (lua_State *L,
- int narg,
- lua_Integer d);</pre>
-
-<p>
-If the function argument <code>narg</code> is a number,
-returns this number cast to a <a href="#lua_Integer"><code>lua_Integer</code></a>.
-If this argument is absent or is <b>nil</b>,
-returns <code>d</code>.
-Otherwise, raises an error.
-
-
-
-
-
-<hr><h3><a name="luaL_optlong"><code>luaL_optlong</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>long luaL_optlong (lua_State *L, int narg, long d);</pre>
-
-<p>
-If the function argument <code>narg</code> is a number,
-returns this number cast to a <code>long</code>.
-If this argument is absent or is <b>nil</b>,
-returns <code>d</code>.
-Otherwise, raises an error.
-
-
-
-
-
-<hr><h3><a name="luaL_optlstring"><code>luaL_optlstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>const char *luaL_optlstring (lua_State *L,
- int narg,
- const char *d,
- size_t *l);</pre>
-
-<p>
-If the function argument <code>narg</code> is a string,
-returns this string.
-If this argument is absent or is <b>nil</b>,
-returns <code>d</code>.
-Otherwise, raises an error.
-
-
-<p>
-If <code>l</code> is not <code>NULL</code>,
-fills the position <code>*l</code> with the results's length.
-
-
-
-
-
-<hr><h3><a name="luaL_optnumber"><code>luaL_optnumber</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number d);</pre>
-
-<p>
-If the function argument <code>narg</code> is a number,
-returns this number.
-If this argument is absent or is <b>nil</b>,
-returns <code>d</code>.
-Otherwise, raises an error.
-
-
-
-
-
-<hr><h3><a name="luaL_optstring"><code>luaL_optstring</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>const char *luaL_optstring (lua_State *L,
- int narg,
- const char *d);</pre>
-
-<p>
-If the function argument <code>narg</code> is a string,
-returns this string.
-If this argument is absent or is <b>nil</b>,
-returns <code>d</code>.
-Otherwise, raises an error.
-
-
-
-
-
-<hr><h3><a name="luaL_prepbuffer"><code>luaL_prepbuffer</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>char *luaL_prepbuffer (luaL_Buffer *B);</pre>
-
-<p>
-Returns an address to a space of size <a name="pdf-LUAL_BUFFERSIZE"><code>LUAL_BUFFERSIZE</code></a>
-where you can copy a string to be added to buffer <code>B</code>
-(see <a href="#luaL_Buffer"><code>luaL_Buffer</code></a>).
-After copying the string into this space you must call
-<a href="#luaL_addsize"><code>luaL_addsize</code></a> with the size of the string to actually add
-it to the buffer.
-
-
-
-
-
-<hr><h3><a name="luaL_pushresult"><code>luaL_pushresult</code></a></h3><p>
-<span class="apii">[-?, +1, <em>m</em>]</span>
-<pre>void luaL_pushresult (luaL_Buffer *B);</pre>
-
-<p>
-Finishes the use of buffer <code>B</code> leaving the final string on
-the top of the stack.
-
-
-
-
-
-<hr><h3><a name="luaL_ref"><code>luaL_ref</code></a></h3><p>
-<span class="apii">[-1, +0, <em>m</em>]</span>
-<pre>int luaL_ref (lua_State *L, int t);</pre>
-
-<p>
-Creates and returns a <em>reference</em>,
-in the table at index <code>t</code>,
-for the object at the top of the stack (and pops the object).
-
-
-<p>
-A reference is a unique integer key.
-As long as you do not manually add integer keys into table <code>t</code>,
-<a href="#luaL_ref"><code>luaL_ref</code></a> ensures the uniqueness of the key it returns.
-You can retrieve an object referred by reference <code>r</code>
-by calling <code>lua_rawgeti(L, t, r)</code>.
-Function <a href="#luaL_unref"><code>luaL_unref</code></a> frees a reference and its associated object.
-
-
-<p>
-If the object at the top of the stack is <b>nil</b>,
-<a href="#luaL_ref"><code>luaL_ref</code></a> returns the constant <a name="pdf-LUA_REFNIL"><code>LUA_REFNIL</code></a>.
-The constant <a name="pdf-LUA_NOREF"><code>LUA_NOREF</code></a> is guaranteed to be different
-from any reference returned by <a href="#luaL_ref"><code>luaL_ref</code></a>.
-
-
-
-
-
-<hr><h3><a name="luaL_Reg"><code>luaL_Reg</code></a></h3>
-<pre>typedef struct luaL_Reg {
- const char *name;
- lua_CFunction func;
-} luaL_Reg;</pre>
-
-<p>
-Type for arrays of functions to be registered by
-<a href="#luaL_register"><code>luaL_register</code></a>.
-<code>name</code> is the function name and <code>func</code> is a pointer to
-the function.
-Any array of <a href="#luaL_Reg"><code>luaL_Reg</code></a> must end with an sentinel entry
-in which both <code>name</code> and <code>func</code> are <code>NULL</code>.
-
-
-
-
-
-<hr><h3><a name="luaL_register"><code>luaL_register</code></a></h3><p>
-<span class="apii">[-(0|1), +1, <em>m</em>]</span>
-<pre>void luaL_register (lua_State *L,
- const char *libname,
- const luaL_Reg *l);</pre>
-
-<p>
-Opens a library.
-
-
-<p>
-When called with <code>libname</code> equal to <code>NULL</code>,
-it simply registers all functions in the list <code>l</code>
-(see <a href="#luaL_Reg"><code>luaL_Reg</code></a>) into the table on the top of the stack.
-
-
-<p>
-When called with a non-null <code>libname</code>,
-<code>luaL_register</code> creates a new table <code>t</code>,
-sets it as the value of the global variable <code>libname</code>,
-sets it as the value of <code>package.loaded[libname]</code>,
-and registers on it all functions in the list <code>l</code>.
-If there is a table in <code>package.loaded[libname]</code> or in
-variable <code>libname</code>,
-reuses this table instead of creating a new one.
-
-
-<p>
-In any case the function leaves the table
-on the top of the stack.
-
-
-
-
-
-<hr><h3><a name="luaL_typename"><code>luaL_typename</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>const char *luaL_typename (lua_State *L, int index);</pre>
-
-<p>
-Returns the name of the type of the value at the given index.
-
-
-
-
-
-<hr><h3><a name="luaL_typerror"><code>luaL_typerror</code></a></h3><p>
-<span class="apii">[-0, +0, <em>v</em>]</span>
-<pre>int luaL_typerror (lua_State *L, int narg, const char *tname);</pre>
-
-<p>
-Generates an error with a message like the following:
-
-<pre>
- <em>location</em>: bad argument <em>narg</em> to '<em>func</em>' (<em>tname</em> expected, got <em>rt</em>)
-</pre><p>
-where <code><em>location</em></code> is produced by <a href="#luaL_where"><code>luaL_where</code></a>,
-<code><em>func</em></code> is the name of the current function,
-and <code><em>rt</em></code> is the type name of the actual argument.
-
-
-
-
-
-<hr><h3><a name="luaL_unref"><code>luaL_unref</code></a></h3><p>
-<span class="apii">[-0, +0, <em>-</em>]</span>
-<pre>void luaL_unref (lua_State *L, int t, int ref);</pre>
-
-<p>
-Releases reference <code>ref</code> from the table at index <code>t</code>
-(see <a href="#luaL_ref"><code>luaL_ref</code></a>).
-The entry is removed from the table,
-so that the referred object can be collected.
-The reference <code>ref</code> is also freed to be used again.
-
-
-<p>
-If <code>ref</code> is <a href="#pdf-LUA_NOREF"><code>LUA_NOREF</code></a> or <a href="#pdf-LUA_REFNIL"><code>LUA_REFNIL</code></a>,
-<a href="#luaL_unref"><code>luaL_unref</code></a> does nothing.
-
-
-
-
-
-<hr><h3><a name="luaL_where"><code>luaL_where</code></a></h3><p>
-<span class="apii">[-0, +1, <em>m</em>]</span>
-<pre>void luaL_where (lua_State *L, int lvl);</pre>
-
-<p>
-Pushes onto the stack a string identifying the current position
-of the control at level <code>lvl</code> in the call stack.
-Typically this string has the following format:
-
-<pre>
- <em>chunkname</em>:<em>currentline</em>:
-</pre><p>
-Level 0 is the running function,
-level 1 is the function that called the running function,
-etc.
-
-
-<p>
-This function is used to build a prefix for error messages.
-
-
-
-
-
-
-
-<h1>5 - <a name="5">Standard Libraries</a></h1>
-
-<p>
-The standard Lua libraries provide useful functions
-that are implemented directly through the C API.
-Some of these functions provide essential services to the language
-(e.g., <a href="#pdf-type"><code>type</code></a> and <a href="#pdf-getmetatable"><code>getmetatable</code></a>);
-others provide access to "outside" services (e.g., I/O);
-and others could be implemented in Lua itself,
-but are quite useful or have critical performance requirements that
-deserve an implementation in C (e.g., <a href="#pdf-table.sort"><code>table.sort</code></a>).
-
-
-<p>
-All libraries are implemented through the official C API
-and are provided as separate C modules.
-Currently, Lua has the following standard libraries:
-
-<ul>
-
-<li>basic library,</li> which includes the coroutine sub-library;
-
-<li>package library;</li>
-
-<li>string manipulation;</li>
-
-<li>table manipulation;</li>
-
-<li>mathematical functions (sin, log, etc.);</li>
-
-<li>input and output;</li>
-
-<li>operating system facilities;</li>
-
-<li>debug facilities.</li>
-
-</ul><p>
-Except for the basic and package libraries,
-each library provides all its functions as fields of a global table
-or as methods of its objects.
-
-
-<p>
-To have access to these libraries,
-the C host program should call the <a href="#luaL_openlibs"><code>luaL_openlibs</code></a> function,
-which opens all standard libraries.
-Alternatively,
-it can open them individually by calling
-<a name="pdf-luaopen_base"><code>luaopen_base</code></a> (for the basic library),
-<a name="pdf-luaopen_package"><code>luaopen_package</code></a> (for the package library),
-<a name="pdf-luaopen_string"><code>luaopen_string</code></a> (for the string library),
-<a name="pdf-luaopen_table"><code>luaopen_table</code></a> (for the table library),
-<a name="pdf-luaopen_math"><code>luaopen_math</code></a> (for the mathematical library),
-<a name="pdf-luaopen_io"><code>luaopen_io</code></a> (for the I/O library),
-<a name="pdf-luaopen_os"><code>luaopen_os</code></a> (for the Operating System library),
-and <a name="pdf-luaopen_debug"><code>luaopen_debug</code></a> (for the debug library).
-These functions are declared in <a name="pdf-lualib.h"><code>lualib.h</code></a>
-and should not be called directly:
-you must call them like any other Lua C function,
-e.g., by using <a href="#lua_call"><code>lua_call</code></a>.
-
-
-
-<h2>5.1 - <a name="5.1">Basic Functions</a></h2>
-
-<p>
-The basic library provides some core functions to Lua.
-If you do not include this library in your application,
-you should check carefully whether you need to provide
-implementations for some of its facilities.
-
-
-<p>
-<hr><h3><a name="pdf-assert"><code>assert (v [, message])</code></a></h3>
-Issues an error when
-the value of its argument <code>v</code> is false (i.e., <b>nil</b> or <b>false</b>);
-otherwise, returns all its arguments.
-<code>message</code> is an error message;
-when absent, it defaults to "assertion failed!"
-
-
-
-
-<p>
-<hr><h3><a name="pdf-collectgarbage"><code>collectgarbage (opt [, arg])</code></a></h3>
-
-
-<p>
-This function is a generic interface to the garbage collector.
-It performs different functions according to its first argument, <code>opt</code>:
-
-<ul>
-
-<li><b>"stop":</b>
-stops the garbage collector.
-</li>
-
-<li><b>"restart":</b>
-restarts the garbage collector.
-</li>
-
-<li><b>"collect":</b>
-performs a full garbage-collection cycle.
-</li>
-
-<li><b>"count":</b>
-returns the total memory in use by Lua (in Kbytes).
-</li>
-
-<li><b>"step":</b>
-performs a garbage-collection step.
-The step "size" is controlled by <code>arg</code>
-(larger values mean more steps) in a non-specified way.
-If you want to control the step size
-you must experimentally tune the value of <code>arg</code>.
-Returns <b>true</b> if the step finished a collection cycle.
-</li>
-
-<li><b>"setpause":</b>
-sets <code>arg</code> as the new value for the <em>pause</em> of
-the collector (see <a href="#2.10">§2.10</a>).
-Returns the previous value for <em>pause</em>.
-</li>
-
-<li><b>"setstepmul":</b>
-sets <code>arg</code> as the new value for the <em>step multiplier</em> of
-the collector (see <a href="#2.10">§2.10</a>).
-Returns the previous value for <em>step</em>.
-</li>
-
-</ul>
-
-
-
-<p>
-<hr><h3><a name="pdf-dofile"><code>dofile (filename)</code></a></h3>
-Opens the named file and executes its contents as a Lua chunk.
-When called without arguments,
-<code>dofile</code> executes the contents of the standard input (<code>stdin</code>).
-Returns all values returned by the chunk.
-In case of errors, <code>dofile</code> propagates the error
-to its caller (that is, <code>dofile</code> does not run in protected mode).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-error"><code>error (message [, level])</code></a></h3>
-Terminates the last protected function called
-and returns <code>message</code> as the error message.
-Function <code>error</code> never returns.
-
-
-<p>
-Usually, <code>error</code> adds some information about the error position
-at the beginning of the message.
-The <code>level</code> argument specifies how to get the error position.
-With level 1 (the default), the error position is where the
-<code>error</code> function was called.
-Level 2 points the error to where the function
-that called <code>error</code> was called; and so on.
-Passing a level 0 avoids the addition of error position information
-to the message.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-_G"><code>_G</code></a></h3>
-A global variable (not a function) that
-holds the global environment (that is, <code>_G._G = _G</code>).
-Lua itself does not use this variable;
-changing its value does not affect any environment,
-nor vice-versa.
-(Use <a href="#pdf-setfenv"><code>setfenv</code></a> to change environments.)
-
-
-
-
-<p>
-<hr><h3><a name="pdf-getfenv"><code>getfenv ([f])</code></a></h3>
-Returns the current environment in use by the function.
-<code>f</code> can be a Lua function or a number
-that specifies the function at that stack level:
-Level 1 is the function calling <code>getfenv</code>.
-If the given function is not a Lua function,
-or if <code>f</code> is 0,
-<code>getfenv</code> returns the global environment.
-The default for <code>f</code> is 1.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-getmetatable"><code>getmetatable (object)</code></a></h3>
-
-
-<p>
-If <code>object</code> does not have a metatable, returns <b>nil</b>.
-Otherwise,
-if the object's metatable has a <code>"__metatable"</code> field,
-returns the associated value.
-Otherwise, returns the metatable of the given object.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-ipairs"><code>ipairs (t)</code></a></h3>
-
-
-<p>
-Returns three values: an iterator function, the table <code>t</code>, and 0,
-so that the construction
-
-<pre>
- for i,v in ipairs(t) do <em>body</em> end
-</pre><p>
-will iterate over the pairs (<code>1,t[1]</code>), (<code>2,t[2]</code>), ···,
-up to the first integer key absent from the table.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-load"><code>load (func [, chunkname])</code></a></h3>
-
-
-<p>
-Loads a chunk using function <code>func</code> to get its pieces.
-Each call to <code>func</code> must return a string that concatenates
-with previous results.
-A return of an empty string, <b>nil</b>, or no value signals the end of the chunk.
-
-
-<p>
-If there are no errors,
-returns the compiled chunk as a function;
-otherwise, returns <b>nil</b> plus the error message.
-The environment of the returned function is the global environment.
-
-
-<p>
-<code>chunkname</code> is used as the chunk name for error messages
-and debug information.
-When absent,
-it defaults to "<code>=(load)</code>".
-
-
-
-
-<p>
-<hr><h3><a name="pdf-loadfile"><code>loadfile ([filename])</code></a></h3>
-
-
-<p>
-Similar to <a href="#pdf-load"><code>load</code></a>,
-but gets the chunk from file <code>filename</code>
-or from the standard input,
-if no file name is given.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-loadstring"><code>loadstring (string [, chunkname])</code></a></h3>
-
-
-<p>
-Similar to <a href="#pdf-load"><code>load</code></a>,
-but gets the chunk from the given string.
-
-
-<p>
-To load and run a given string, use the idiom
-
-<pre>
- assert(loadstring(s))()
-</pre>
-
-<p>
-When absent,
-<code>chunkname</code> defaults to the given string.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-next"><code>next (table [, index])</code></a></h3>
-
-
-<p>
-Allows a program to traverse all fields of a table.
-Its first argument is a table and its second argument
-is an index in this table.
-<code>next</code> returns the next index of the table
-and its associated value.
-When called with <b>nil</b> as its second argument,
-<code>next</code> returns an initial index
-and its associated value.
-When called with the last index,
-or with <b>nil</b> in an empty table,
-<code>next</code> returns <b>nil</b>.
-If the second argument is absent, then it is interpreted as <b>nil</b>.
-In particular,
-you can use <code>next(t)</code> to check whether a table is empty.
-
-
-<p>
-The order in which the indices are enumerated is not specified,
-<em>even for numeric indices</em>.
-(To traverse a table in numeric order,
-use a numerical <b>for</b> or the <a href="#pdf-ipairs"><code>ipairs</code></a> function.)
-
-
-<p>
-The behavior of <code>next</code> is <em>undefined</em> if,
-during the traversal,
-you assign any value to a non-existent field in the table.
-You may however modify existing fields.
-In particular, you may clear existing fields.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-pairs"><code>pairs (t)</code></a></h3>
-
-
-<p>
-Returns three values: the <a href="#pdf-next"><code>next</code></a> function, the table <code>t</code>, and <b>nil</b>,
-so that the construction
-
-<pre>
- for k,v in pairs(t) do <em>body</em> end
-</pre><p>
-will iterate over all key–value pairs of table <code>t</code>.
-
-
-<p>
-See function <a href="#pdf-next"><code>next</code></a> for the caveats of modifying
-the table during its traversal.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-pcall"><code>pcall (f, arg1, ···)</code></a></h3>
-
-
-<p>
-Calls function <code>f</code> with
-the given arguments in <em>protected mode</em>.
-This means that any error inside <code>f</code> is not propagated;
-instead, <code>pcall</code> catches the error
-and returns a status code.
-Its first result is the status code (a boolean),
-which is true if the call succeeds without errors.
-In such case, <code>pcall</code> also returns all results from the call,
-after this first result.
-In case of any error, <code>pcall</code> returns <b>false</b> plus the error message.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-print"><code>print (···)</code></a></h3>
-Receives any number of arguments,
-and prints their values to <code>stdout</code>,
-using the <a href="#pdf-tostring"><code>tostring</code></a> function to convert them to strings.
-<code>print</code> is not intended for formatted output,
-but only as a quick way to show a value,
-typically for debugging.
-For formatted output, use <a href="#pdf-string.format"><code>string.format</code></a>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-rawequal"><code>rawequal (v1, v2)</code></a></h3>
-Checks whether <code>v1</code> is equal to <code>v2</code>,
-without invoking any metamethod.
-Returns a boolean.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-rawget"><code>rawget (table, index)</code></a></h3>
-Gets the real value of <code>table[index]</code>,
-without invoking any metamethod.
-<code>table</code> must be a table;
-<code>index</code> may be any value.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-rawset"><code>rawset (table, index, value)</code></a></h3>
-Sets the real value of <code>table[index]</code> to <code>value</code>,
-without invoking any metamethod.
-<code>table</code> must be a table,
-<code>index</code> any value different from <b>nil</b>,
-and <code>value</code> any Lua value.
-
-
-<p>
-This function returns <code>table</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-select"><code>select (index, ···)</code></a></h3>
-
-
-<p>
-If <code>index</code> is a number,
-returns all arguments after argument number <code>index</code>.
-Otherwise, <code>index</code> must be the string <code>"#"</code>,
-and <code>select</code> returns the total number of extra arguments it received.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-setfenv"><code>setfenv (f, table)</code></a></h3>
-
-
-<p>
-Sets the environment to be used by the given function.
-<code>f</code> can be a Lua function or a number
-that specifies the function at that stack level:
-Level 1 is the function calling <code>setfenv</code>.
-<code>setfenv</code> returns the given function.
-
-
-<p>
-As a special case, when <code>f</code> is 0 <code>setfenv</code> changes
-the environment of the running thread.
-In this case, <code>setfenv</code> returns no values.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-setmetatable"><code>setmetatable (table, metatable)</code></a></h3>
-
-
-<p>
-Sets the metatable for the given table.
-(You cannot change the metatable of other types from Lua, only from C.)
-If <code>metatable</code> is <b>nil</b>,
-removes the metatable of the given table.
-If the original metatable has a <code>"__metatable"</code> field,
-raises an error.
-
-
-<p>
-This function returns <code>table</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-tonumber"><code>tonumber (e [, base])</code></a></h3>
-Tries to convert its argument to a number.
-If the argument is already a number or a string convertible
-to a number, then <code>tonumber</code> returns this number;
-otherwise, it returns <b>nil</b>.
-
-
-<p>
-An optional argument specifies the base to interpret the numeral.
-The base may be any integer between 2 and 36, inclusive.
-In bases above 10, the letter '<code>A</code>' (in either upper or lower case)
-represents 10, '<code>B</code>' represents 11, and so forth,
-with '<code>Z</code>' representing 35.
-In base 10 (the default), the number can have a decimal part,
-as well as an optional exponent part (see <a href="#2.1">§2.1</a>).
-In other bases, only unsigned integers are accepted.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-tostring"><code>tostring (e)</code></a></h3>
-Receives an argument of any type and
-converts it to a string in a reasonable format.
-For complete control of how numbers are converted,
-use <a href="#pdf-string.format"><code>string.format</code></a>.
-
-
-<p>
-If the metatable of <code>e</code> has a <code>"__tostring"</code> field,
-then <code>tostring</code> calls the corresponding value
-with <code>e</code> as argument,
-and uses the result of the call as its result.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-type"><code>type (v)</code></a></h3>
-Returns the type of its only argument, coded as a string.
-The possible results of this function are
-"<code>nil</code>" (a string, not the value <b>nil</b>),
-"<code>number</code>",
-"<code>string</code>",
-"<code>boolean</code>",
-"<code>table</code>",
-"<code>function</code>",
-"<code>thread</code>",
-and "<code>userdata</code>".
-
-
-
-
-<p>
-<hr><h3><a name="pdf-unpack"><code>unpack (list [, i [, j]])</code></a></h3>
-Returns the elements from the given table.
-This function is equivalent to
-
-<pre>
- return list[i], list[i+1], ···, list[j]
-</pre><p>
-except that the above code can be written only for a fixed number
-of elements.
-By default, <code>i</code> is 1 and <code>j</code> is the length of the list,
-as defined by the length operator (see <a href="#2.5.5">§2.5.5</a>).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-_VERSION"><code>_VERSION</code></a></h3>
-A global variable (not a function) that
-holds a string containing the current interpreter version.
-The current contents of this variable is "<code>Lua 5.1</code>".
-
-
-
-
-<p>
-<hr><h3><a name="pdf-xpcall"><code>xpcall (f, err)</code></a></h3>
-
-
-<p>
-This function is similar to <a href="#pdf-pcall"><code>pcall</code></a>,
-except that you can set a new error handler.
-
-
-<p>
-<code>xpcall</code> calls function <code>f</code> in protected mode,
-using <code>err</code> as the error handler.
-Any error inside <code>f</code> is not propagated;
-instead, <code>xpcall</code> catches the error,
-calls the <code>err</code> function with the original error object,
-and returns a status code.
-Its first result is the status code (a boolean),
-which is true if the call succeeds without errors.
-In this case, <code>xpcall</code> also returns all results from the call,
-after this first result.
-In case of any error,
-<code>xpcall</code> returns <b>false</b> plus the result from <code>err</code>.
-
-
-
-
-
-
-
-<h2>5.2 - <a name="5.2">Coroutine Manipulation</a></h2>
-
-<p>
-The operations related to coroutines comprise a sub-library of
-the basic library and come inside the table <a name="pdf-coroutine"><code>coroutine</code></a>.
-See <a href="#2.11">§2.11</a> for a general description of coroutines.
-
-
-<p>
-<hr><h3><a name="pdf-coroutine.create"><code>coroutine.create (f)</code></a></h3>
-
-
-<p>
-Creates a new coroutine, with body <code>f</code>.
-<code>f</code> must be a Lua function.
-Returns this new coroutine,
-an object with type <code>"thread"</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-coroutine.resume"><code>coroutine.resume (co [, val1, ···])</code></a></h3>
-
-
-<p>
-Starts or continues the execution of coroutine <code>co</code>.
-The first time you resume a coroutine,
-it starts running its body.
-The values <code>val1</code>, ··· are passed
-as the arguments to the body function.
-If the coroutine has yielded,
-<code>resume</code> restarts it;
-the values <code>val1</code>, ··· are passed
-as the results from the yield.
-
-
-<p>
-If the coroutine runs without any errors,
-<code>resume</code> returns <b>true</b> plus any values passed to <code>yield</code>
-(if the coroutine yields) or any values returned by the body function
-(if the coroutine terminates).
-If there is any error,
-<code>resume</code> returns <b>false</b> plus the error message.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-coroutine.running"><code>coroutine.running ()</code></a></h3>
-
-
-<p>
-Returns the running coroutine,
-or <b>nil</b> when called by the main thread.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-coroutine.status"><code>coroutine.status (co)</code></a></h3>
-
-
-<p>
-Returns the status of coroutine <code>co</code>, as a string:
-<code>"running"</code>,
-if the coroutine is running (that is, it called <code>status</code>);
-<code>"suspended"</code>, if the coroutine is suspended in a call to <code>yield</code>,
-or if it has not started running yet;
-<code>"normal"</code> if the coroutine is active but not running
-(that is, it has resumed another coroutine);
-and <code>"dead"</code> if the coroutine has finished its body function,
-or if it has stopped with an error.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-coroutine.wrap"><code>coroutine.wrap (f)</code></a></h3>
-
-
-<p>
-Creates a new coroutine, with body <code>f</code>.
-<code>f</code> must be a Lua function.
-Returns a function that resumes the coroutine each time it is called.
-Any arguments passed to the function behave as the
-extra arguments to <code>resume</code>.
-Returns the same values returned by <code>resume</code>,
-except the first boolean.
-In case of error, propagates the error.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-coroutine.yield"><code>coroutine.yield (···)</code></a></h3>
-
-
-<p>
-Suspends the execution of the calling coroutine.
-The coroutine cannot be running a C function,
-a metamethod, or an iterator.
-Any arguments to <code>yield</code> are passed as extra results to <code>resume</code>.
-
-
-
-
-
-
-
-<h2>5.3 - <a name="5.3">Modules</a></h2>
-
-<p>
-The package library provides basic
-facilities for loading and building modules in Lua.
-It exports two of its functions directly in the global environment:
-<a href="#pdf-require"><code>require</code></a> and <a href="#pdf-module"><code>module</code></a>.
-Everything else is exported in a table <a name="pdf-package"><code>package</code></a>.
-
-
-<p>
-<hr><h3><a name="pdf-module"><code>module (name [, ···])</code></a></h3>
-
-
-<p>
-Creates a module.
-If there is a table in <code>package.loaded[name]</code>,
-this table is the module.
-Otherwise, if there is a global table <code>t</code> with the given name,
-this table is the module.
-Otherwise creates a new table <code>t</code> and
-sets it as the value of the global <code>name</code> and
-the value of <code>package.loaded[name]</code>.
-This function also initializes <code>t._NAME</code> with the given name,
-<code>t._M</code> with the module (<code>t</code> itself),
-and <code>t._PACKAGE</code> with the package name
-(the full module name minus last component; see below).
-Finally, <code>module</code> sets <code>t</code> as the new environment
-of the current function and the new value of <code>package.loaded[name]</code>,
-so that <a href="#pdf-require"><code>require</code></a> returns <code>t</code>.
-
-
-<p>
-If <code>name</code> is a compound name
-(that is, one with components separated by dots),
-<code>module</code> creates (or reuses, if they already exist)
-tables for each component.
-For instance, if <code>name</code> is <code>a.b.c</code>,
-then <code>module</code> stores the module table in field <code>c</code> of
-field <code>b</code> of global <code>a</code>.
-
-
-<p>
-This function can receive optional <em>options</em> after
-the module name,
-where each option is a function to be applied over the module.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-require"><code>require (modname)</code></a></h3>
-
-
-<p>
-Loads the given module.
-The function starts by looking into the <a href="#pdf-package.loaded"><code>package.loaded</code></a> table
-to determine whether <code>modname</code> is already loaded.
-If it is, then <code>require</code> returns the value stored
-at <code>package.loaded[modname]</code>.
-Otherwise, it tries to find a <em>loader</em> for the module.
-
-
-<p>
-To find a loader,
-<code>require</code> is guided by the <a href="#pdf-package.loaders"><code>package.loaders</code></a> array.
-By changing this array,
-we can change how <code>require</code> looks for a module.
-The following explanation is based on the default configuration
-for <a href="#pdf-package.loaders"><code>package.loaders</code></a>.
-
-
-<p>
-First <code>require</code> queries <code>package.preload[modname]</code>.
-If it has a value,
-this value (which should be a function) is the loader.
-Otherwise <code>require</code> searches for a Lua loader using the
-path stored in <a href="#pdf-package.path"><code>package.path</code></a>.
-If that also fails, it searches for a C loader using the
-path stored in <a href="#pdf-package.cpath"><code>package.cpath</code></a>.
-If that also fails,
-it tries an <em>all-in-one</em> loader (see <a href="#pdf-package.loaders"><code>package.loaders</code></a>).
-
-
-<p>
-Once a loader is found,
-<code>require</code> calls the loader with a single argument, <code>modname</code>.
-If the loader returns any value,
-<code>require</code> assigns the returned value to <code>package.loaded[modname]</code>.
-If the loader returns no value and
-has not assigned any value to <code>package.loaded[modname]</code>,
-then <code>require</code> assigns <b>true</b> to this entry.
-In any case, <code>require</code> returns the
-final value of <code>package.loaded[modname]</code>.
-
-
-<p>
-If there is any error loading or running the module,
-or if it cannot find any loader for the module,
-then <code>require</code> signals an error.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-package.cpath"><code>package.cpath</code></a></h3>
-
-
-<p>
-The path used by <a href="#pdf-require"><code>require</code></a> to search for a C loader.
-
-
-<p>
-Lua initializes the C path <a href="#pdf-package.cpath"><code>package.cpath</code></a> in the same way
-it initializes the Lua path <a href="#pdf-package.path"><code>package.path</code></a>,
-using the environment variable <a name="pdf-LUA_CPATH"><code>LUA_CPATH</code></a>
-or a default path defined in <code>luaconf.h</code>.
-
-
-
-
-<p>
-
-<hr><h3><a name="pdf-package.loaded"><code>package.loaded</code></a></h3>
-
-
-<p>
-A table used by <a href="#pdf-require"><code>require</code></a> to control which
-modules are already loaded.
-When you require a module <code>modname</code> and
-<code>package.loaded[modname]</code> is not false,
-<a href="#pdf-require"><code>require</code></a> simply returns the value stored there.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-package.loaders"><code>package.loaders</code></a></h3>
-
-
-<p>
-A table used by <a href="#pdf-require"><code>require</code></a> to control how to load modules.
-
-
-<p>
-Each entry in this table is a <em>searcher function</em>.
-When looking for a module,
-<a href="#pdf-require"><code>require</code></a> calls each of these searchers in ascending order,
-with the module name (the argument given to <a href="#pdf-require"><code>require</code></a>) as its
-sole parameter.
-The function can return another function (the module <em>loader</em>)
-or a string explaining why it did not find that module
-(or <b>nil</b> if it has nothing to say).
-Lua initializes this table with four functions.
-
-
-<p>
-The first searcher simply looks for a loader in the
-<a href="#pdf-package.preload"><code>package.preload</code></a> table.
-
-
-<p>
-The second searcher looks for a loader as a Lua library,
-using the path stored at <a href="#pdf-package.path"><code>package.path</code></a>.
-A path is a sequence of <em>templates</em> separated by semicolons.
-For each template,
-the searcher will change each interrogation
-mark in the template by <code>filename</code>,
-which is the module name with each dot replaced by a
-"directory separator" (such as "<code>/</code>" in Unix);
-then it will try to open the resulting file name.
-So, for instance, if the Lua path is the string
-
-<pre>
- "./?.lua;./?.lc;/usr/local/?/init.lua"
-</pre><p>
-the search for a Lua file for module <code>foo</code>
-will try to open the files
-<code>./foo.lua</code>, <code>./foo.lc</code>, and
-<code>/usr/local/foo/init.lua</code>, in that order.
-
-
-<p>
-The third searcher looks for a loader as a C library,
-using the path given by the variable <a href="#pdf-package.cpath"><code>package.cpath</code></a>.
-For instance,
-if the C path is the string
-
-<pre>
- "./?.so;./?.dll;/usr/local/?/init.so"
-</pre><p>
-the searcher for module <code>foo</code>
-will try to open the files <code>./foo.so</code>, <code>./foo.dll</code>,
-and <code>/usr/local/foo/init.so</code>, in that order.
-Once it finds a C library,
-this searcher first uses a dynamic link facility to link the
-application with the library.
-Then it tries to find a C function inside the library to
-be used as the loader.
-The name of this C function is the string "<code>luaopen_</code>"
-concatenated with a copy of the module name where each dot
-is replaced by an underscore.
-Moreover, if the module name has a hyphen,
-its prefix up to (and including) the first hyphen is removed.
-For instance, if the module name is <code>a.v1-b.c</code>,
-the function name will be <code>luaopen_b_c</code>.
-
-
-<p>
-The fourth searcher tries an <em>all-in-one loader</em>.
-It searches the C path for a library for
-the root name of the given module.
-For instance, when requiring <code>a.b.c</code>,
-it will search for a C library for <code>a</code>.
-If found, it looks into it for an open function for
-the submodule;
-in our example, that would be <code>luaopen_a_b_c</code>.
-With this facility, a package can pack several C submodules
-into one single library,
-with each submodule keeping its original open function.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-package.loadlib"><code>package.loadlib (libname, funcname)</code></a></h3>
-
-
-<p>
-Dynamically links the host program with the C library <code>libname</code>.
-Inside this library, looks for a function <code>funcname</code>
-and returns this function as a C function.
-(So, <code>funcname</code> must follow the protocol (see <a href="#lua_CFunction"><code>lua_CFunction</code></a>)).
-
-
-<p>
-This is a low-level function.
-It completely bypasses the package and module system.
-Unlike <a href="#pdf-require"><code>require</code></a>,
-it does not perform any path searching and
-does not automatically adds extensions.
-<code>libname</code> must be the complete file name of the C library,
-including if necessary a path and extension.
-<code>funcname</code> must be the exact name exported by the C library
-(which may depend on the C compiler and linker used).
-
-
-<p>
-This function is not supported by ANSI C.
-As such, it is only available on some platforms
-(Windows, Linux, Mac OS X, Solaris, BSD,
-plus other Unix systems that support the <code>dlfcn</code> standard).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-package.path"><code>package.path</code></a></h3>
-
-
-<p>
-The path used by <a href="#pdf-require"><code>require</code></a> to search for a Lua loader.
-
-
-<p>
-At start-up, Lua initializes this variable with
-the value of the environment variable <a name="pdf-LUA_PATH"><code>LUA_PATH</code></a> or
-with a default path defined in <code>luaconf.h</code>,
-if the environment variable is not defined.
-Any "<code>;;</code>" in the value of the environment variable
-is replaced by the default path.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-package.preload"><code>package.preload</code></a></h3>
-
-
-<p>
-A table to store loaders for specific modules
-(see <a href="#pdf-require"><code>require</code></a>).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-package.seeall"><code>package.seeall (module)</code></a></h3>
-
-
-<p>
-Sets a metatable for <code>module</code> with
-its <code>__index</code> field referring to the global environment,
-so that this module inherits values
-from the global environment.
-To be used as an option to function <a href="#pdf-module"><code>module</code></a>.
-
-
-
-
-
-
-
-<h2>5.4 - <a name="5.4">String Manipulation</a></h2>
-
-<p>
-This library provides generic functions for string manipulation,
-such as finding and extracting substrings, and pattern matching.
-When indexing a string in Lua, the first character is at position 1
-(not at 0, as in C).
-Indices are allowed to be negative and are interpreted as indexing backwards,
-from the end of the string.
-Thus, the last character is at position -1, and so on.
-
-
-<p>
-The string library provides all its functions inside the table
-<a name="pdf-string"><code>string</code></a>.
-It also sets a metatable for strings
-where the <code>__index</code> field points to the <code>string</code> table.
-Therefore, you can use the string functions in object-oriented style.
-For instance, <code>string.byte(s, i)</code>
-can be written as <code>s:byte(i)</code>.
-
-
-<p>
-The string library assumes one-byte character encodings.
-
-
-<p>
-<hr><h3><a name="pdf-string.byte"><code>string.byte (s [, i [, j]])</code></a></h3>
-Returns the internal numerical codes of the characters <code>s[i]</code>,
-<code>s[i+1]</code>, ···, <code>s[j]</code>.
-The default value for <code>i</code> is 1;
-the default value for <code>j</code> is <code>i</code>.
-
-
-<p>
-Note that numerical codes are not necessarily portable across platforms.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.char"><code>string.char (···)</code></a></h3>
-Receives zero or more integers.
-Returns a string with length equal to the number of arguments,
-in which each character has the internal numerical code equal
-to its corresponding argument.
-
-
-<p>
-Note that numerical codes are not necessarily portable across platforms.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.dump"><code>string.dump (function)</code></a></h3>
-
-
-<p>
-Returns a string containing a binary representation of the given function,
-so that a later <a href="#pdf-loadstring"><code>loadstring</code></a> on this string returns
-a copy of the function.
-<code>function</code> must be a Lua function without upvalues.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.find"><code>string.find (s, pattern [, init [, plain]])</code></a></h3>
-Looks for the first match of
-<code>pattern</code> in the string <code>s</code>.
-If it finds a match, then <code>find</code> returns the indices of <code>s</code>
-where this occurrence starts and ends;
-otherwise, it returns <b>nil</b>.
-A third, optional numerical argument <code>init</code> specifies
-where to start the search;
-its default value is 1 and can be negative.
-A value of <b>true</b> as a fourth, optional argument <code>plain</code>
-turns off the pattern matching facilities,
-so the function does a plain "find substring" operation,
-with no characters in <code>pattern</code> being considered "magic".
-Note that if <code>plain</code> is given, then <code>init</code> must be given as well.
-
-
-<p>
-If the pattern has captures,
-then in a successful match
-the captured values are also returned,
-after the two indices.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.format"><code>string.format (formatstring, ···)</code></a></h3>
-Returns a formatted version of its variable number of arguments
-following the description given in its first argument (which must be a string).
-The format string follows the same rules as the <code>printf</code> family of
-standard C functions.
-The only differences are that the options/modifiers
-<code>*</code>, <code>l</code>, <code>L</code>, <code>n</code>, <code>p</code>,
-and <code>h</code> are not supported
-and that there is an extra option, <code>q</code>.
-The <code>q</code> option formats a string in a form suitable to be safely read
-back by the Lua interpreter:
-the string is written between double quotes,
-and all double quotes, newlines, embedded zeros,
-and backslashes in the string
-are correctly escaped when written.
-For instance, the call
-
-<pre>
- string.format('%q', 'a string with "quotes" and \n new line')
-</pre><p>
-will produce the string:
-
-<pre>
- "a string with \"quotes\" and \
- new line"
-</pre>
-
-<p>
-The options <code>c</code>, <code>d</code>, <code>E</code>, <code>e</code>, <code>f</code>,
-<code>g</code>, <code>G</code>, <code>i</code>, <code>o</code>, <code>u</code>, <code>X</code>, and <code>x</code> all
-expect a number as argument,
-whereas <code>q</code> and <code>s</code> expect a string.
-
-
-<p>
-This function does not accept string values
-containing embedded zeros,
-except as arguments to the <code>q</code> option.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.gmatch"><code>string.gmatch (s, pattern)</code></a></h3>
-Returns an iterator function that,
-each time it is called,
-returns the next captures from <code>pattern</code> over string <code>s</code>.
-If <code>pattern</code> specifies no captures,
-then the whole match is produced in each call.
-
-
-<p>
-As an example, the following loop
-
-<pre>
- s = "hello world from Lua"
- for w in string.gmatch(s, "%a+") do
- print(w)
- end
-</pre><p>
-will iterate over all the words from string <code>s</code>,
-printing one per line.
-The next example collects all pairs <code>key=value</code> from the
-given string into a table:
-
-<pre>
- t = {}
- s = "from=world, to=Lua"
- for k, v in string.gmatch(s, "(%w+)=(%w+)") do
- t[k] = v
- end
-</pre>
-
-<p>
-For this function, a '<code>^</code>' at the start of a pattern does not
-work as an anchor, as this would prevent the iteration.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.gsub"><code>string.gsub (s, pattern, repl [, n])</code></a></h3>
-Returns a copy of <code>s</code>
-in which all (or the first <code>n</code>, if given)
-occurrences of the <code>pattern</code> have been
-replaced by a replacement string specified by <code>repl</code>,
-which can be a string, a table, or a function.
-<code>gsub</code> also returns, as its second value,
-the total number of matches that occurred.
-
-
-<p>
-If <code>repl</code> is a string, then its value is used for replacement.
-The character <code>%</code> works as an escape character:
-any sequence in <code>repl</code> of the form <code>%<em>n</em></code>,
-with <em>n</em> between 1 and 9,
-stands for the value of the <em>n</em>-th captured substring (see below).
-The sequence <code>%0</code> stands for the whole match.
-The sequence <code>%%</code> stands for a single <code>%</code>.
-
-
-<p>
-If <code>repl</code> is a table, then the table is queried for every match,
-using the first capture as the key;
-if the pattern specifies no captures,
-then the whole match is used as the key.
-
-
-<p>
-If <code>repl</code> is a function, then this function is called every time a
-match occurs, with all captured substrings passed as arguments,
-in order;
-if the pattern specifies no captures,
-then the whole match is passed as a sole argument.
-
-
-<p>
-If the value returned by the table query or by the function call
-is a string or a number,
-then it is used as the replacement string;
-otherwise, if it is <b>false</b> or <b>nil</b>,
-then there is no replacement
-(that is, the original match is kept in the string).
-
-
-<p>
-Here are some examples:
-
-<pre>
- x = string.gsub("hello world", "(%w+)", "%1 %1")
- --> x="hello hello world world"
-
- x = string.gsub("hello world", "%w+", "%0 %0", 1)
- --> x="hello hello world"
-
- x = string.gsub("hello world from Lua", "(%w+)%s*(%w+)", "%2 %1")
- --> x="world hello Lua from"
-
- x = string.gsub("home = $HOME, user = $USER", "%$(%w+)", os.getenv)
- --> x="home = /home/roberto, user = roberto"
-
- x = string.gsub("4+5 = $return 4+5$", "%$(.-)%$", function (s)
- return loadstring(s)()
- end)
- --> x="4+5 = 9"
-
- local t = {name="lua", version="5.1"}
- x = string.gsub("$name-$version.tar.gz", "%$(%w+)", t)
- --> x="lua-5.1.tar.gz"
-</pre>
-
-
-
-<p>
-<hr><h3><a name="pdf-string.len"><code>string.len (s)</code></a></h3>
-Receives a string and returns its length.
-The empty string <code>""</code> has length 0.
-Embedded zeros are counted,
-so <code>"a\000bc\000"</code> has length 5.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.lower"><code>string.lower (s)</code></a></h3>
-Receives a string and returns a copy of this string with all
-uppercase letters changed to lowercase.
-All other characters are left unchanged.
-The definition of what an uppercase letter is depends on the current locale.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.match"><code>string.match (s, pattern [, init])</code></a></h3>
-Looks for the first <em>match</em> of
-<code>pattern</code> in the string <code>s</code>.
-If it finds one, then <code>match</code> returns
-the captures from the pattern;
-otherwise it returns <b>nil</b>.
-If <code>pattern</code> specifies no captures,
-then the whole match is returned.
-A third, optional numerical argument <code>init</code> specifies
-where to start the search;
-its default value is 1 and can be negative.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.rep"><code>string.rep (s, n)</code></a></h3>
-Returns a string that is the concatenation of <code>n</code> copies of
-the string <code>s</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.reverse"><code>string.reverse (s)</code></a></h3>
-Returns a string that is the string <code>s</code> reversed.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.sub"><code>string.sub (s, i [, j])</code></a></h3>
-Returns the substring of <code>s</code> that
-starts at <code>i</code> and continues until <code>j</code>;
-<code>i</code> and <code>j</code> can be negative.
-If <code>j</code> is absent, then it is assumed to be equal to -1
-(which is the same as the string length).
-In particular,
-the call <code>string.sub(s,1,j)</code> returns a prefix of <code>s</code>
-with length <code>j</code>,
-and <code>string.sub(s, -i)</code> returns a suffix of <code>s</code>
-with length <code>i</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-string.upper"><code>string.upper (s)</code></a></h3>
-Receives a string and returns a copy of this string with all
-lowercase letters changed to uppercase.
-All other characters are left unchanged.
-The definition of what a lowercase letter is depends on the current locale.
-
-
-
-<h3>5.4.1 - <a name="5.4.1">Patterns</a></h3>
-
-
-<h4>Character Class:</h4><p>
-A <em>character class</em> is used to represent a set of characters.
-The following combinations are allowed in describing a character class:
-
-<ul>
-
-<li><b><em>x</em>:</b>
-(where <em>x</em> is not one of the <em>magic characters</em>
-<code>^$()%.[]*+-?</code>)
-represents the character <em>x</em> itself.
-</li>
-
-<li><b><code>.</code>:</b> (a dot) represents all characters.</li>
-
-<li><b><code>%a</code>:</b> represents all letters.</li>
-
-<li><b><code>%c</code>:</b> represents all control characters.</li>
-
-<li><b><code>%d</code>:</b> represents all digits.</li>
-
-<li><b><code>%l</code>:</b> represents all lowercase letters.</li>
-
-<li><b><code>%p</code>:</b> represents all punctuation characters.</li>
-
-<li><b><code>%s</code>:</b> represents all space characters.</li>
-
-<li><b><code>%u</code>:</b> represents all uppercase letters.</li>
-
-<li><b><code>%w</code>:</b> represents all alphanumeric characters.</li>
-
-<li><b><code>%x</code>:</b> represents all hexadecimal digits.</li>
-
-<li><b><code>%z</code>:</b> represents the character with representation 0.</li>
-
-<li><b><code>%<em>x</em></code>:</b> (where <em>x</em> is any non-alphanumeric character)
-represents the character <em>x</em>.
-This is the standard way to escape the magic characters.
-Any punctuation character (even the non magic)
-can be preceded by a '<code>%</code>'
-when used to represent itself in a pattern.
-</li>
-
-<li><b><code>[<em>set</em>]</code>:</b>
-represents the class which is the union of all
-characters in <em>set</em>.
-A range of characters can be specified by
-separating the end characters of the range with a '<code>-</code>'.
-All classes <code>%</code><em>x</em> described above can also be used as
-components in <em>set</em>.
-All other characters in <em>set</em> represent themselves.
-For example, <code>[%w_]</code> (or <code>[_%w]</code>)
-represents all alphanumeric characters plus the underscore,
-<code>[0-7]</code> represents the octal digits,
-and <code>[0-7%l%-]</code> represents the octal digits plus
-the lowercase letters plus the '<code>-</code>' character.
-
-
-<p>
-The interaction between ranges and classes is not defined.
-Therefore, patterns like <code>[%a-z]</code> or <code>[a-%%]</code>
-have no meaning.
-</li>
-
-<li><b><code>[^<em>set</em>]</code>:</b>
-represents the complement of <em>set</em>,
-where <em>set</em> is interpreted as above.
-</li>
-
-</ul><p>
-For all classes represented by single letters (<code>%a</code>, <code>%c</code>, etc.),
-the corresponding uppercase letter represents the complement of the class.
-For instance, <code>%S</code> represents all non-space characters.
-
-
-<p>
-The definitions of letter, space, and other character groups
-depend on the current locale.
-In particular, the class <code>[a-z]</code> may not be equivalent to <code>%l</code>.
-
-
-
-
-
-<h4>Pattern Item:</h4><p>
-A <em>pattern item</em> can be
-
-<ul>
-
-<li>
-a single character class,
-which matches any single character in the class;
-</li>
-
-<li>
-a single character class followed by '<code>*</code>',
-which matches 0 or more repetitions of characters in the class.
-These repetition items will always match the longest possible sequence;
-</li>
-
-<li>
-a single character class followed by '<code>+</code>',
-which matches 1 or more repetitions of characters in the class.
-These repetition items will always match the longest possible sequence;
-</li>
-
-<li>
-a single character class followed by '<code>-</code>',
-which also matches 0 or more repetitions of characters in the class.
-Unlike '<code>*</code>',
-these repetition items will always match the <em>shortest</em> possible sequence;
-</li>
-
-<li>
-a single character class followed by '<code>?</code>',
-which matches 0 or 1 occurrence of a character in the class;
-</li>
-
-<li>
-<code>%<em>n</em></code>, for <em>n</em> between 1 and 9;
-such item matches a substring equal to the <em>n</em>-th captured string
-(see below);
-</li>
-
-<li>
-<code>%b<em>xy</em></code>, where <em>x</em> and <em>y</em> are two distinct characters;
-such item matches strings that start with <em>x</em>, end with <em>y</em>,
-and where the <em>x</em> and <em>y</em> are <em>balanced</em>.
-This means that, if one reads the string from left to right,
-counting <em>+1</em> for an <em>x</em> and <em>-1</em> for a <em>y</em>,
-the ending <em>y</em> is the first <em>y</em> where the count reaches 0.
-For instance, the item <code>%b()</code> matches expressions with
-balanced parentheses.
-</li>
-
-</ul>
-
-
-
-
-<h4>Pattern:</h4><p>
-A <em>pattern</em> is a sequence of pattern items.
-A '<code>^</code>' at the beginning of a pattern anchors the match at the
-beginning of the subject string.
-A '<code>$</code>' at the end of a pattern anchors the match at the
-end of the subject string.
-At other positions,
-'<code>^</code>' and '<code>$</code>' have no special meaning and represent themselves.
-
-
-
-
-
-<h4>Captures:</h4><p>
-A pattern can contain sub-patterns enclosed in parentheses;
-they describe <em>captures</em>.
-When a match succeeds, the substrings of the subject string
-that match captures are stored (<em>captured</em>) for future use.
-Captures are numbered according to their left parentheses.
-For instance, in the pattern <code>"(a*(.)%w(%s*))"</code>,
-the part of the string matching <code>"a*(.)%w(%s*)"</code> is
-stored as the first capture (and therefore has number 1);
-the character matching "<code>.</code>" is captured with number 2,
-and the part matching "<code>%s*</code>" has number 3.
-
-
-<p>
-As a special case, the empty capture <code>()</code> captures
-the current string position (a number).
-For instance, if we apply the pattern <code>"()aa()"</code> on the
-string <code>"flaaap"</code>, there will be two captures: 3 and 5.
-
-
-<p>
-A pattern cannot contain embedded zeros. Use <code>%z</code> instead.
-
-
-
-
-
-
-
-
-
-
-
-<h2>5.5 - <a name="5.5">Table Manipulation</a></h2><p>
-This library provides generic functions for table manipulation.
-It provides all its functions inside the table <a name="pdf-table"><code>table</code></a>.
-
-
-<p>
-Most functions in the table library assume that the table
-represents an array or a list.
-For these functions, when we talk about the "length" of a table
-we mean the result of the length operator.
-
-
-<p>
-<hr><h3><a name="pdf-table.concat"><code>table.concat (table [, sep [, i [, j]]])</code></a></h3>
-Given an array where all elements are strings or numbers,
-returns <code>table[i]..sep..table[i+1] ··· sep..table[j]</code>.
-The default value for <code>sep</code> is the empty string,
-the default for <code>i</code> is 1,
-and the default for <code>j</code> is the length of the table.
-If <code>i</code> is greater than <code>j</code>, returns the empty string.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-table.insert"><code>table.insert (table, [pos,] value)</code></a></h3>
-
-
-<p>
-Inserts element <code>value</code> at position <code>pos</code> in <code>table</code>,
-shifting up other elements to open space, if necessary.
-The default value for <code>pos</code> is <code>n+1</code>,
-where <code>n</code> is the length of the table (see <a href="#2.5.5">§2.5.5</a>),
-so that a call <code>table.insert(t,x)</code> inserts <code>x</code> at the end
-of table <code>t</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-table.maxn"><code>table.maxn (table)</code></a></h3>
-
-
-<p>
-Returns the largest positive numerical index of the given table,
-or zero if the table has no positive numerical indices.
-(To do its job this function does a linear traversal of
-the whole table.)
-
-
-
-
-<p>
-<hr><h3><a name="pdf-table.remove"><code>table.remove (table [, pos])</code></a></h3>
-
-
-<p>
-Removes from <code>table</code> the element at position <code>pos</code>,
-shifting down other elements to close the space, if necessary.
-Returns the value of the removed element.
-The default value for <code>pos</code> is <code>n</code>,
-where <code>n</code> is the length of the table,
-so that a call <code>table.remove(t)</code> removes the last element
-of table <code>t</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-table.sort"><code>table.sort (table [, comp])</code></a></h3>
-Sorts table elements in a given order, <em>in-place</em>,
-from <code>table[1]</code> to <code>table[n]</code>,
-where <code>n</code> is the length of the table.
-If <code>comp</code> is given,
-then it must be a function that receives two table elements,
-and returns true
-when the first is less than the second
-(so that <code>not comp(a[i+1],a[i])</code> will be true after the sort).
-If <code>comp</code> is not given,
-then the standard Lua operator <code><</code> is used instead.
-
-
-<p>
-The sort algorithm is not stable;
-that is, elements considered equal by the given order
-may have their relative positions changed by the sort.
-
-
-
-
-
-
-
-<h2>5.6 - <a name="5.6">Mathematical Functions</a></h2>
-
-<p>
-This library is an interface to the standard C math library.
-It provides all its functions inside the table <a name="pdf-math"><code>math</code></a>.
-
-
-<p>
-<hr><h3><a name="pdf-math.abs"><code>math.abs (x)</code></a></h3>
-
-
-<p>
-Returns the absolute value of <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.acos"><code>math.acos (x)</code></a></h3>
-
-
-<p>
-Returns the arc cosine of <code>x</code> (in radians).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.asin"><code>math.asin (x)</code></a></h3>
-
-
-<p>
-Returns the arc sine of <code>x</code> (in radians).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.atan"><code>math.atan (x)</code></a></h3>
-
-
-<p>
-Returns the arc tangent of <code>x</code> (in radians).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.atan2"><code>math.atan2 (y, x)</code></a></h3>
-
-
-<p>
-Returns the arc tangent of <code>y/x</code> (in radians),
-but uses the signs of both parameters to find the
-quadrant of the result.
-(It also handles correctly the case of <code>x</code> being zero.)
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.ceil"><code>math.ceil (x)</code></a></h3>
-
-
-<p>
-Returns the smallest integer larger than or equal to <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.cos"><code>math.cos (x)</code></a></h3>
-
-
-<p>
-Returns the cosine of <code>x</code> (assumed to be in radians).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.cosh"><code>math.cosh (x)</code></a></h3>
-
-
-<p>
-Returns the hyperbolic cosine of <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.deg"><code>math.deg (x)</code></a></h3>
-
-
-<p>
-Returns the angle <code>x</code> (given in radians) in degrees.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.exp"><code>math.exp (x)</code></a></h3>
-
-
-<p>
-Returns the value <em>e<sup>x</sup></em>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.floor"><code>math.floor (x)</code></a></h3>
-
-
-<p>
-Returns the largest integer smaller than or equal to <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.fmod"><code>math.fmod (x, y)</code></a></h3>
-
-
-<p>
-Returns the remainder of the division of <code>x</code> by <code>y</code>
-that rounds the quotient towards zero.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.frexp"><code>math.frexp (x)</code></a></h3>
-
-
-<p>
-Returns <code>m</code> and <code>e</code> such that <em>x = m2<sup>e</sup></em>,
-<code>e</code> is an integer and the absolute value of <code>m</code> is
-in the range <em>[0.5, 1)</em>
-(or zero when <code>x</code> is zero).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.huge"><code>math.huge</code></a></h3>
-
-
-<p>
-The value <code>HUGE_VAL</code>,
-a value larger than or equal to any other numerical value.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.ldexp"><code>math.ldexp (m, e)</code></a></h3>
-
-
-<p>
-Returns <em>m2<sup>e</sup></em> (<code>e</code> should be an integer).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.log"><code>math.log (x)</code></a></h3>
-
-
-<p>
-Returns the natural logarithm of <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.log10"><code>math.log10 (x)</code></a></h3>
-
-
-<p>
-Returns the base-10 logarithm of <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.max"><code>math.max (x, ···)</code></a></h3>
-
-
-<p>
-Returns the maximum value among its arguments.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.min"><code>math.min (x, ···)</code></a></h3>
-
-
-<p>
-Returns the minimum value among its arguments.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.modf"><code>math.modf (x)</code></a></h3>
-
-
-<p>
-Returns two numbers,
-the integral part of <code>x</code> and the fractional part of <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.pi"><code>math.pi</code></a></h3>
-
-
-<p>
-The value of <em>pi</em>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.pow"><code>math.pow (x, y)</code></a></h3>
-
-
-<p>
-Returns <em>x<sup>y</sup></em>.
-(You can also use the expression <code>x^y</code> to compute this value.)
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.rad"><code>math.rad (x)</code></a></h3>
-
-
-<p>
-Returns the angle <code>x</code> (given in degrees) in radians.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.random"><code>math.random ([m [, n]])</code></a></h3>
-
-
-<p>
-This function is an interface to the simple
-pseudo-random generator function <code>rand</code> provided by ANSI C.
-(No guarantees can be given for its statistical properties.)
-
-
-<p>
-When called without arguments,
-returns a uniform pseudo-random real number
-in the range <em>[0,1)</em>.
-When called with an integer number <code>m</code>,
-<code>math.random</code> returns
-a uniform pseudo-random integer in the range <em>[1, m]</em>.
-When called with two integer numbers <code>m</code> and <code>n</code>,
-<code>math.random</code> returns a uniform pseudo-random
-integer in the range <em>[m, n]</em>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.randomseed"><code>math.randomseed (x)</code></a></h3>
-
-
-<p>
-Sets <code>x</code> as the "seed"
-for the pseudo-random generator:
-equal seeds produce equal sequences of numbers.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.sin"><code>math.sin (x)</code></a></h3>
-
-
-<p>
-Returns the sine of <code>x</code> (assumed to be in radians).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.sinh"><code>math.sinh (x)</code></a></h3>
-
-
-<p>
-Returns the hyperbolic sine of <code>x</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.sqrt"><code>math.sqrt (x)</code></a></h3>
-
-
-<p>
-Returns the square root of <code>x</code>.
-(You can also use the expression <code>x^0.5</code> to compute this value.)
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.tan"><code>math.tan (x)</code></a></h3>
-
-
-<p>
-Returns the tangent of <code>x</code> (assumed to be in radians).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-math.tanh"><code>math.tanh (x)</code></a></h3>
-
-
-<p>
-Returns the hyperbolic tangent of <code>x</code>.
-
-
-
-
-
-
-
-<h2>5.7 - <a name="5.7">Input and Output Facilities</a></h2>
-
-<p>
-The I/O library provides two different styles for file manipulation.
-The first one uses implicit file descriptors;
-that is, there are operations to set a default input file and a
-default output file,
-and all input/output operations are over these default files.
-The second style uses explicit file descriptors.
-
-
-<p>
-When using implicit file descriptors,
-all operations are supplied by table <a name="pdf-io"><code>io</code></a>.
-When using explicit file descriptors,
-the operation <a href="#pdf-io.open"><code>io.open</code></a> returns a file descriptor
-and then all operations are supplied as methods of the file descriptor.
-
-
-<p>
-The table <code>io</code> also provides
-three predefined file descriptors with their usual meanings from C:
-<a name="pdf-io.stdin"><code>io.stdin</code></a>, <a name="pdf-io.stdout"><code>io.stdout</code></a>, and <a name="pdf-io.stderr"><code>io.stderr</code></a>.
-The I/O library never closes these files.
-
-
-<p>
-Unless otherwise stated,
-all I/O functions return <b>nil</b> on failure
-(plus an error message as a second result and
-a system-dependent error code as a third result)
-and some value different from <b>nil</b> on success.
-
-
-<p>
-<hr><h3><a name="pdf-io.close"><code>io.close ([file])</code></a></h3>
-
-
-<p>
-Equivalent to <code>file:close()</code>.
-Without a <code>file</code>, closes the default output file.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.flush"><code>io.flush ()</code></a></h3>
-
-
-<p>
-Equivalent to <code>file:flush</code> over the default output file.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.input"><code>io.input ([file])</code></a></h3>
-
-
-<p>
-When called with a file name, it opens the named file (in text mode),
-and sets its handle as the default input file.
-When called with a file handle,
-it simply sets this file handle as the default input file.
-When called without parameters,
-it returns the current default input file.
-
-
-<p>
-In case of errors this function raises the error,
-instead of returning an error code.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.lines"><code>io.lines ([filename])</code></a></h3>
-
-
-<p>
-Opens the given file name in read mode
-and returns an iterator function that,
-each time it is called,
-returns a new line from the file.
-Therefore, the construction
-
-<pre>
- for line in io.lines(filename) do <em>body</em> end
-</pre><p>
-will iterate over all lines of the file.
-When the iterator function detects the end of file,
-it returns <b>nil</b> (to finish the loop) and automatically closes the file.
-
-
-<p>
-The call <code>io.lines()</code> (with no file name) is equivalent
-to <code>io.input():lines()</code>;
-that is, it iterates over the lines of the default input file.
-In this case it does not close the file when the loop ends.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.open"><code>io.open (filename [, mode])</code></a></h3>
-
-
-<p>
-This function opens a file,
-in the mode specified in the string <code>mode</code>.
-It returns a new file handle,
-or, in case of errors, <b>nil</b> plus an error message.
-
-
-<p>
-The <code>mode</code> string can be any of the following:
-
-<ul>
-<li><b>"r":</b> read mode (the default);</li>
-<li><b>"w":</b> write mode;</li>
-<li><b>"a":</b> append mode;</li>
-<li><b>"r+":</b> update mode, all previous data is preserved;</li>
-<li><b>"w+":</b> update mode, all previous data is erased;</li>
-<li><b>"a+":</b> append update mode, previous data is preserved,
- writing is only allowed at the end of file.</li>
-</ul><p>
-The <code>mode</code> string can also have a '<code>b</code>' at the end,
-which is needed in some systems to open the file in binary mode.
-This string is exactly what is used in the
-standard C function <code>fopen</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.output"><code>io.output ([file])</code></a></h3>
-
-
-<p>
-Similar to <a href="#pdf-io.input"><code>io.input</code></a>, but operates over the default output file.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.popen"><code>io.popen (prog [, mode])</code></a></h3>
-
-
-<p>
-Starts program <code>prog</code> in a separated process and returns
-a file handle that you can use to read data from this program
-(if <code>mode</code> is <code>"r"</code>, the default)
-or to write data to this program
-(if <code>mode</code> is <code>"w"</code>).
-
-
-<p>
-This function is system dependent and is not available
-on all platforms.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.read"><code>io.read (···)</code></a></h3>
-
-
-<p>
-Equivalent to <code>io.input():read</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.tmpfile"><code>io.tmpfile ()</code></a></h3>
-
-
-<p>
-Returns a handle for a temporary file.
-This file is opened in update mode
-and it is automatically removed when the program ends.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.type"><code>io.type (obj)</code></a></h3>
-
-
-<p>
-Checks whether <code>obj</code> is a valid file handle.
-Returns the string <code>"file"</code> if <code>obj</code> is an open file handle,
-<code>"closed file"</code> if <code>obj</code> is a closed file handle,
-or <b>nil</b> if <code>obj</code> is not a file handle.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-io.write"><code>io.write (···)</code></a></h3>
-
-
-<p>
-Equivalent to <code>io.output():write</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-file:close"><code>file:close ()</code></a></h3>
-
-
-<p>
-Closes <code>file</code>.
-Note that files are automatically closed when
-their handles are garbage collected,
-but that takes an unpredictable amount of time to happen.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-file:flush"><code>file:flush ()</code></a></h3>
-
-
-<p>
-Saves any written data to <code>file</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-file:lines"><code>file:lines ()</code></a></h3>
-
-
-<p>
-Returns an iterator function that,
-each time it is called,
-returns a new line from the file.
-Therefore, the construction
-
-<pre>
- for line in file:lines() do <em>body</em> end
-</pre><p>
-will iterate over all lines of the file.
-(Unlike <a href="#pdf-io.lines"><code>io.lines</code></a>, this function does not close the file
-when the loop ends.)
-
-
-
-
-<p>
-<hr><h3><a name="pdf-file:read"><code>file:read (···)</code></a></h3>
-
-
-<p>
-Reads the file <code>file</code>,
-according to the given formats, which specify what to read.
-For each format,
-the function returns a string (or a number) with the characters read,
-or <b>nil</b> if it cannot read data with the specified format.
-When called without formats,
-it uses a default format that reads the entire next line
-(see below).
-
-
-<p>
-The available formats are
-
-<ul>
-
-<li><b>"*n":</b>
-reads a number;
-this is the only format that returns a number instead of a string.
-</li>
-
-<li><b>"*a":</b>
-reads the whole file, starting at the current position.
-On end of file, it returns the empty string.
-</li>
-
-<li><b>"*l":</b>
-reads the next line (skipping the end of line),
-returning <b>nil</b> on end of file.
-This is the default format.
-</li>
-
-<li><b><em>number</em>:</b>
-reads a string with up to this number of characters,
-returning <b>nil</b> on end of file.
-If number is zero,
-it reads nothing and returns an empty string,
-or <b>nil</b> on end of file.
-</li>
-
-</ul>
-
-
-
-<p>
-<hr><h3><a name="pdf-file:seek"><code>file:seek ([whence] [, offset])</code></a></h3>
-
-
-<p>
-Sets and gets the file position,
-measured from the beginning of the file,
-to the position given by <code>offset</code> plus a base
-specified by the string <code>whence</code>, as follows:
-
-<ul>
-<li><b>"set":</b> base is position 0 (beginning of the file);</li>
-<li><b>"cur":</b> base is current position;</li>
-<li><b>"end":</b> base is end of file;</li>
-</ul><p>
-In case of success, function <code>seek</code> returns the final file position,
-measured in bytes from the beginning of the file.
-If this function fails, it returns <b>nil</b>,
-plus a string describing the error.
-
-
-<p>
-The default value for <code>whence</code> is <code>"cur"</code>,
-and for <code>offset</code> is 0.
-Therefore, the call <code>file:seek()</code> returns the current
-file position, without changing it;
-the call <code>file:seek("set")</code> sets the position to the
-beginning of the file (and returns 0);
-and the call <code>file:seek("end")</code> sets the position to the
-end of the file, and returns its size.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-file:setvbuf"><code>file:setvbuf (mode [, size])</code></a></h3>
-
-
-<p>
-Sets the buffering mode for an output file.
-There are three available modes:
-
-<ul>
-
-<li><b>"no":</b>
-no buffering; the result of any output operation appears immediately.
-</li>
-
-<li><b>"full":</b>
-full buffering; output operation is performed only
-when the buffer is full (or when you explicitly <code>flush</code> the file
-(see <a href="#pdf-io.flush"><code>io.flush</code></a>)).
-</li>
-
-<li><b>"line":</b>
-line buffering; output is buffered until a newline is output
-or there is any input from some special files
-(such as a terminal device).
-</li>
-
-</ul><p>
-For the last two cases, <code>size</code>
-specifies the size of the buffer, in bytes.
-The default is an appropriate size.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-file:write"><code>file:write (···)</code></a></h3>
-
-
-<p>
-Writes the value of each of its arguments to
-the <code>file</code>.
-The arguments must be strings or numbers.
-To write other values,
-use <a href="#pdf-tostring"><code>tostring</code></a> or <a href="#pdf-string.format"><code>string.format</code></a> before <code>write</code>.
-
-
-
-
-
-
-
-<h2>5.8 - <a name="5.8">Operating System Facilities</a></h2>
-
-<p>
-This library is implemented through table <a name="pdf-os"><code>os</code></a>.
-
-
-<p>
-<hr><h3><a name="pdf-os.clock"><code>os.clock ()</code></a></h3>
-
-
-<p>
-Returns an approximation of the amount in seconds of CPU time
-used by the program.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.date"><code>os.date ([format [, time]])</code></a></h3>
-
-
-<p>
-Returns a string or a table containing date and time,
-formatted according to the given string <code>format</code>.
-
-
-<p>
-If the <code>time</code> argument is present,
-this is the time to be formatted
-(see the <a href="#pdf-os.time"><code>os.time</code></a> function for a description of this value).
-Otherwise, <code>date</code> formats the current time.
-
-
-<p>
-If <code>format</code> starts with '<code>!</code>',
-then the date is formatted in Coordinated Universal Time.
-After this optional character,
-if <code>format</code> is the string "<code>*t</code>",
-then <code>date</code> returns a table with the following fields:
-<code>year</code> (four digits), <code>month</code> (1--12), <code>day</code> (1--31),
-<code>hour</code> (0--23), <code>min</code> (0--59), <code>sec</code> (0--61),
-<code>wday</code> (weekday, Sunday is 1),
-<code>yday</code> (day of the year),
-and <code>isdst</code> (daylight saving flag, a boolean).
-
-
-<p>
-If <code>format</code> is not "<code>*t</code>",
-then <code>date</code> returns the date as a string,
-formatted according to the same rules as the C function <code>strftime</code>.
-
-
-<p>
-When called without arguments,
-<code>date</code> returns a reasonable date and time representation that depends on
-the host system and on the current locale
-(that is, <code>os.date()</code> is equivalent to <code>os.date("%c")</code>).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.difftime"><code>os.difftime (t2, t1)</code></a></h3>
-
-
-<p>
-Returns the number of seconds from time <code>t1</code> to time <code>t2</code>.
-In POSIX, Windows, and some other systems,
-this value is exactly <code>t2</code><em>-</em><code>t1</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.execute"><code>os.execute ([command])</code></a></h3>
-
-
-<p>
-This function is equivalent to the C function <code>system</code>.
-It passes <code>command</code> to be executed by an operating system shell.
-It returns a status code, which is system-dependent.
-If <code>command</code> is absent, then it returns nonzero if a shell is available
-and zero otherwise.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.exit"><code>os.exit ([code])</code></a></h3>
-
-
-<p>
-Calls the C function <code>exit</code>,
-with an optional <code>code</code>,
-to terminate the host program.
-The default value for <code>code</code> is the success code.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.getenv"><code>os.getenv (varname)</code></a></h3>
-
-
-<p>
-Returns the value of the process environment variable <code>varname</code>,
-or <b>nil</b> if the variable is not defined.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.remove"><code>os.remove (filename)</code></a></h3>
-
-
-<p>
-Deletes the file or directory with the given name.
-Directories must be empty to be removed.
-If this function fails, it returns <b>nil</b>,
-plus a string describing the error.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.rename"><code>os.rename (oldname, newname)</code></a></h3>
-
-
-<p>
-Renames file or directory named <code>oldname</code> to <code>newname</code>.
-If this function fails, it returns <b>nil</b>,
-plus a string describing the error.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.setlocale"><code>os.setlocale (locale [, category])</code></a></h3>
-
-
-<p>
-Sets the current locale of the program.
-<code>locale</code> is a string specifying a locale;
-<code>category</code> is an optional string describing which category to change:
-<code>"all"</code>, <code>"collate"</code>, <code>"ctype"</code>,
-<code>"monetary"</code>, <code>"numeric"</code>, or <code>"time"</code>;
-the default category is <code>"all"</code>.
-The function returns the name of the new locale,
-or <b>nil</b> if the request cannot be honored.
-
-
-<p>
-If <code>locale</code> is the empty string,
-the current locale is set to an implementation-defined native locale.
-If <code>locale</code> is the string "<code>C</code>",
-the current locale is set to the standard C locale.
-
-
-<p>
-When called with <b>nil</b> as the first argument,
-this function only returns the name of the current locale
-for the given category.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.time"><code>os.time ([table])</code></a></h3>
-
-
-<p>
-Returns the current time when called without arguments,
-or a time representing the date and time specified by the given table.
-This table must have fields <code>year</code>, <code>month</code>, and <code>day</code>,
-and may have fields <code>hour</code>, <code>min</code>, <code>sec</code>, and <code>isdst</code>
-(for a description of these fields, see the <a href="#pdf-os.date"><code>os.date</code></a> function).
-
-
-<p>
-The returned value is a number, whose meaning depends on your system.
-In POSIX, Windows, and some other systems, this number counts the number
-of seconds since some given start time (the "epoch").
-In other systems, the meaning is not specified,
-and the number returned by <code>time</code> can be used only as an argument to
-<code>date</code> and <code>difftime</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-os.tmpname"><code>os.tmpname ()</code></a></h3>
-
-
-<p>
-Returns a string with a file name that can
-be used for a temporary file.
-The file must be explicitly opened before its use
-and explicitly removed when no longer needed.
-
-
-<p>
-On some systems (POSIX),
-this function also creates a file with that name,
-to avoid security risks.
-(Someone else might create the file with wrong permissions
-in the time between getting the name and creating the file.)
-You still have to open the file to use it
-and to remove it (even if you do not use it).
-
-
-<p>
-When possible,
-you may prefer to use <a href="#pdf-io.tmpfile"><code>io.tmpfile</code></a>,
-which automatically removes the file when the program ends.
-
-
-
-
-
-
-
-<h2>5.9 - <a name="5.9">The Debug Library</a></h2>
-
-<p>
-This library provides
-the functionality of the debug interface to Lua programs.
-You should exert care when using this library.
-The functions provided here should be used exclusively for debugging
-and similar tasks, such as profiling.
-Please resist the temptation to use them as a
-usual programming tool:
-they can be very slow.
-Moreover, several of these functions
-violate some assumptions about Lua code
-(e.g., that variables local to a function
-cannot be accessed from outside or
-that userdata metatables cannot be changed by Lua code)
-and therefore can compromise otherwise secure code.
-
-
-<p>
-All functions in this library are provided
-inside the <a name="pdf-debug"><code>debug</code></a> table.
-All functions that operate over a thread
-have an optional first argument which is the
-thread to operate over.
-The default is always the current thread.
-
-
-<p>
-<hr><h3><a name="pdf-debug.debug"><code>debug.debug ()</code></a></h3>
-
-
-<p>
-Enters an interactive mode with the user,
-running each string that the user enters.
-Using simple commands and other debug facilities,
-the user can inspect global and local variables,
-change their values, evaluate expressions, and so on.
-A line containing only the word <code>cont</code> finishes this function,
-so that the caller continues its execution.
-
-
-<p>
-Note that commands for <code>debug.debug</code> are not lexically nested
-within any function, and so have no direct access to local variables.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.getfenv"><code>debug.getfenv (o)</code></a></h3>
-Returns the environment of object <code>o</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.gethook"><code>debug.gethook ([thread])</code></a></h3>
-
-
-<p>
-Returns the current hook settings of the thread, as three values:
-the current hook function, the current hook mask,
-and the current hook count
-(as set by the <a href="#pdf-debug.sethook"><code>debug.sethook</code></a> function).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.getinfo"><code>debug.getinfo ([thread,] function [, what])</code></a></h3>
-
-
-<p>
-Returns a table with information about a function.
-You can give the function directly,
-or you can give a number as the value of <code>function</code>,
-which means the function running at level <code>function</code> of the call stack
-of the given thread:
-level 0 is the current function (<code>getinfo</code> itself);
-level 1 is the function that called <code>getinfo</code>;
-and so on.
-If <code>function</code> is a number larger than the number of active functions,
-then <code>getinfo</code> returns <b>nil</b>.
-
-
-<p>
-The returned table can contain all the fields returned by <a href="#lua_getinfo"><code>lua_getinfo</code></a>,
-with the string <code>what</code> describing which fields to fill in.
-The default for <code>what</code> is to get all information available,
-except the table of valid lines.
-If present,
-the option '<code>f</code>'
-adds a field named <code>func</code> with the function itself.
-If present,
-the option '<code>L</code>'
-adds a field named <code>activelines</code> with the table of
-valid lines.
-
-
-<p>
-For instance, the expression <code>debug.getinfo(1,"n").name</code> returns
-a table with a name for the current function,
-if a reasonable name can be found,
-and the expression <code>debug.getinfo(print)</code>
-returns a table with all available information
-about the <a href="#pdf-print"><code>print</code></a> function.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.getlocal"><code>debug.getlocal ([thread,] level, local)</code></a></h3>
-
-
-<p>
-This function returns the name and the value of the local variable
-with index <code>local</code> of the function at level <code>level</code> of the stack.
-(The first parameter or local variable has index 1, and so on,
-until the last active local variable.)
-The function returns <b>nil</b> if there is no local
-variable with the given index,
-and raises an error when called with a <code>level</code> out of range.
-(You can call <a href="#pdf-debug.getinfo"><code>debug.getinfo</code></a> to check whether the level is valid.)
-
-
-<p>
-Variable names starting with '<code>(</code>' (open parentheses)
-represent internal variables
-(loop control variables, temporaries, and C function locals).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.getmetatable"><code>debug.getmetatable (object)</code></a></h3>
-
-
-<p>
-Returns the metatable of the given <code>object</code>
-or <b>nil</b> if it does not have a metatable.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.getregistry"><code>debug.getregistry ()</code></a></h3>
-
-
-<p>
-Returns the registry table (see <a href="#3.5">§3.5</a>).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.getupvalue"><code>debug.getupvalue (func, up)</code></a></h3>
-
-
-<p>
-This function returns the name and the value of the upvalue
-with index <code>up</code> of the function <code>func</code>.
-The function returns <b>nil</b> if there is no upvalue with the given index.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.setfenv"><code>debug.setfenv (object, table)</code></a></h3>
-
-
-<p>
-Sets the environment of the given <code>object</code> to the given <code>table</code>.
-Returns <code>object</code>.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.sethook"><code>debug.sethook ([thread,] hook, mask [, count])</code></a></h3>
-
-
-<p>
-Sets the given function as a hook.
-The string <code>mask</code> and the number <code>count</code> describe
-when the hook will be called.
-The string mask may have the following characters,
-with the given meaning:
-
-<ul>
-<li><b><code>"c"</code>:</b> the hook is called every time Lua calls a function;</li>
-<li><b><code>"r"</code>:</b> the hook is called every time Lua returns from a function;</li>
-<li><b><code>"l"</code>:</b> the hook is called every time Lua enters a new line of code.</li>
-</ul><p>
-With a <code>count</code> different from zero,
-the hook is called after every <code>count</code> instructions.
-
-
-<p>
-When called without arguments,
-<a href="#pdf-debug.sethook"><code>debug.sethook</code></a> turns off the hook.
-
-
-<p>
-When the hook is called, its first parameter is a string
-describing the event that has triggered its call:
-<code>"call"</code>, <code>"return"</code> (or <code>"tail return"</code>,
-when simulating a return from a tail call),
-<code>"line"</code>, and <code>"count"</code>.
-For line events,
-the hook also gets the new line number as its second parameter.
-Inside a hook,
-you can call <code>getinfo</code> with level 2 to get more information about
-the running function
-(level 0 is the <code>getinfo</code> function,
-and level 1 is the hook function),
-unless the event is <code>"tail return"</code>.
-In this case, Lua is only simulating the return,
-and a call to <code>getinfo</code> will return invalid data.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.setlocal"><code>debug.setlocal ([thread,] level, local, value)</code></a></h3>
-
-
-<p>
-This function assigns the value <code>value</code> to the local variable
-with index <code>local</code> of the function at level <code>level</code> of the stack.
-The function returns <b>nil</b> if there is no local
-variable with the given index,
-and raises an error when called with a <code>level</code> out of range.
-(You can call <code>getinfo</code> to check whether the level is valid.)
-Otherwise, it returns the name of the local variable.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.setmetatable"><code>debug.setmetatable (object, table)</code></a></h3>
-
-
-<p>
-Sets the metatable for the given <code>object</code> to the given <code>table</code>
-(which can be <b>nil</b>).
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.setupvalue"><code>debug.setupvalue (func, up, value)</code></a></h3>
-
-
-<p>
-This function assigns the value <code>value</code> to the upvalue
-with index <code>up</code> of the function <code>func</code>.
-The function returns <b>nil</b> if there is no upvalue
-with the given index.
-Otherwise, it returns the name of the upvalue.
-
-
-
-
-<p>
-<hr><h3><a name="pdf-debug.traceback"><code>debug.traceback ([thread,] [message] [, level])</code></a></h3>
-
-
-<p>
-Returns a string with a traceback of the call stack.
-An optional <code>message</code> string is appended
-at the beginning of the traceback.
-An optional <code>level</code> number tells at which level
-to start the traceback
-(default is 1, the function calling <code>traceback</code>).
-
-
-
-
-
-
-
-<h1>6 - <a name="6">Lua Stand-alone</a></h1>
-
-<p>
-Although Lua has been designed as an extension language,
-to be embedded in a host C program,
-it is also frequently used as a stand-alone language.
-An interpreter for Lua as a stand-alone language,
-called simply <code>lua</code>,
-is provided with the standard distribution.
-The stand-alone interpreter includes
-all standard libraries, including the debug library.
-Its usage is:
-
-<pre>
- lua [options] [script [args]]
-</pre><p>
-The options are:
-
-<ul>
-<li><b><code>-e <em>stat</em></code>:</b> executes string <em>stat</em>;</li>
-<li><b><code>-l <em>mod</em></code>:</b> "requires" <em>mod</em>;</li>
-<li><b><code>-i</code>:</b> enters interactive mode after running <em>script</em>;</li>
-<li><b><code>-v</code>:</b> prints version information;</li>
-<li><b><code>--</code>:</b> stops handling options;</li>
-<li><b><code>-</code>:</b> executes <code>stdin</code> as a file and stops handling options.</li>
-</ul><p>
-After handling its options, <code>lua</code> runs the given <em>script</em>,
-passing to it the given <em>args</em> as string arguments.
-When called without arguments,
-<code>lua</code> behaves as <code>lua -v -i</code>
-when the standard input (<code>stdin</code>) is a terminal,
-and as <code>lua -</code> otherwise.
-
-
-<p>
-Before running any argument,
-the interpreter checks for an environment variable <a name="pdf-LUA_INIT"><code>LUA_INIT</code></a>.
-If its format is <code>@<em>filename</em></code>,
-then <code>lua</code> executes the file.
-Otherwise, <code>lua</code> executes the string itself.
-
-
-<p>
-All options are handled in order, except <code>-i</code>.
-For instance, an invocation like
-
-<pre>
- $ lua -e'a=1' -e 'print(a)' script.lua
-</pre><p>
-will first set <code>a</code> to 1, then print the value of <code>a</code> (which is '<code>1</code>'),
-and finally run the file <code>script.lua</code> with no arguments.
-(Here <code>$</code> is the shell prompt. Your prompt may be different.)
-
-
-<p>
-Before starting to run the script,
-<code>lua</code> collects all arguments in the command line
-in a global table called <code>arg</code>.
-The script name is stored at index 0,
-the first argument after the script name goes to index 1,
-and so on.
-Any arguments before the script name
-(that is, the interpreter name plus the options)
-go to negative indices.
-For instance, in the call
-
-<pre>
- $ lua -la b.lua t1 t2
-</pre><p>
-the interpreter first runs the file <code>a.lua</code>,
-then creates a table
-
-<pre>
- arg = { [-2] = "lua", [-1] = "-la",
- [0] = "b.lua",
- [1] = "t1", [2] = "t2" }
-</pre><p>
-and finally runs the file <code>b.lua</code>.
-The script is called with <code>arg[1]</code>, <code>arg[2]</code>, ···
-as arguments;
-it can also access these arguments with the vararg expression '<code>...</code>'.
-
-
-<p>
-In interactive mode,
-if you write an incomplete statement,
-the interpreter waits for its completion
-by issuing a different prompt.
-
-
-<p>
-If the global variable <a name="pdf-_PROMPT"><code>_PROMPT</code></a> contains a string,
-then its value is used as the prompt.
-Similarly, if the global variable <a name="pdf-_PROMPT2"><code>_PROMPT2</code></a> contains a string,
-its value is used as the secondary prompt
-(issued during incomplete statements).
-Therefore, both prompts can be changed directly on the command line
-or in any Lua programs by assigning to <code>_PROMPT</code>.
-See the next example:
-
-<pre>
- $ lua -e"_PROMPT='myprompt> '" -i
-</pre><p>
-(The outer pair of quotes is for the shell,
-the inner pair is for Lua.)
-Note the use of <code>-i</code> to enter interactive mode;
-otherwise,
-the program would just end silently
-right after the assignment to <code>_PROMPT</code>.
-
-
-<p>
-To allow the use of Lua as a
-script interpreter in Unix systems,
-the stand-alone interpreter skips
-the first line of a chunk if it starts with <code>#</code>.
-Therefore, Lua scripts can be made into executable programs
-by using <code>chmod +x</code> and the <code>#!</code> form,
-as in
-
-<pre>
- #!/usr/local/bin/lua
-</pre><p>
-(Of course,
-the location of the Lua interpreter may be different in your machine.
-If <code>lua</code> is in your <code>PATH</code>,
-then
-
-<pre>
- #!/usr/bin/env lua
-</pre><p>
-is a more portable solution.)
-
-
-
-<h1>7 - <a name="7">Incompatibilities with the Previous Version</a></h1>
-
-<p>
-Here we list the incompatibilities that you may find when moving a program
-from Lua 5.0 to Lua 5.1.
-You can avoid most of the incompatibilities compiling Lua with
-appropriate options (see file <code>luaconf.h</code>).
-However,
-all these compatibility options will be removed in the next version of Lua.
-
-
-
-<h2>7.1 - <a name="7.1">Changes in the Language</a></h2>
-<ul>
-
-<li>
-The vararg system changed from the pseudo-argument <code>arg</code> with a
-table with the extra arguments to the vararg expression.
-(See compile-time option <code>LUA_COMPAT_VARARG</code> in <code>luaconf.h</code>.)
-</li>
-
-<li>
-There was a subtle change in the scope of the implicit
-variables of the <b>for</b> statement and for the <b>repeat</b> statement.
-</li>
-
-<li>
-The long string/long comment syntax (<code>[[<em>string</em>]]</code>)
-does not allow nesting.
-You can use the new syntax (<code>[=[<em>string</em>]=]</code>) in these cases.
-(See compile-time option <code>LUA_COMPAT_LSTR</code> in <code>luaconf.h</code>.)
-</li>
-
-</ul>
-
-
-
-
-<h2>7.2 - <a name="7.2">Changes in the Libraries</a></h2>
-<ul>
-
-<li>
-Function <code>string.gfind</code> was renamed <a href="#pdf-string.gmatch"><code>string.gmatch</code></a>.
-(See compile-time option <code>LUA_COMPAT_GFIND</code> in <code>luaconf.h</code>.)
-</li>
-
-<li>
-When <a href="#pdf-string.gsub"><code>string.gsub</code></a> is called with a function as its
-third argument,
-whenever this function returns <b>nil</b> or <b>false</b> the
-replacement string is the whole match,
-instead of the empty string.
-</li>
-
-<li>
-Function <code>table.setn</code> was deprecated.
-Function <code>table.getn</code> corresponds
-to the new length operator (<code>#</code>);
-use the operator instead of the function.
-(See compile-time option <code>LUA_COMPAT_GETN</code> in <code>luaconf.h</code>.)
-</li>
-
-<li>
-Function <code>loadlib</code> was renamed <a href="#pdf-package.loadlib"><code>package.loadlib</code></a>.
-(See compile-time option <code>LUA_COMPAT_LOADLIB</code> in <code>luaconf.h</code>.)
-</li>
-
-<li>
-Function <code>math.mod</code> was renamed <a href="#pdf-math.fmod"><code>math.fmod</code></a>.
-(See compile-time option <code>LUA_COMPAT_MOD</code> in <code>luaconf.h</code>.)
-</li>
-
-<li>
-Functions <code>table.foreach</code> and <code>table.foreachi</code> are deprecated.
-You can use a for loop with <code>pairs</code> or <code>ipairs</code> instead.
-</li>
-
-<li>
-There were substantial changes in function <a href="#pdf-require"><code>require</code></a> due to
-the new module system.
-However, the new behavior is mostly compatible with the old,
-but <code>require</code> gets the path from <a href="#pdf-package.path"><code>package.path</code></a> instead
-of from <code>LUA_PATH</code>.
-</li>
-
-<li>
-Function <a href="#pdf-collectgarbage"><code>collectgarbage</code></a> has different arguments.
-Function <code>gcinfo</code> is deprecated;
-use <code>collectgarbage("count")</code> instead.
-</li>
-
-</ul>
-
-
-
-
-<h2>7.3 - <a name="7.3">Changes in the API</a></h2>
-<ul>
-
-<li>
-The <code>luaopen_*</code> functions (to open libraries)
-cannot be called directly,
-like a regular C function.
-They must be called through Lua,
-like a Lua function.
-</li>
-
-<li>
-Function <code>lua_open</code> was replaced by <a href="#lua_newstate"><code>lua_newstate</code></a> to
-allow the user to set a memory-allocation function.
-You can use <a href="#luaL_newstate"><code>luaL_newstate</code></a> from the standard library to
-create a state with a standard allocation function
-(based on <code>realloc</code>).
-</li>
-
-<li>
-Functions <code>luaL_getn</code> and <code>luaL_setn</code>
-(from the auxiliary library) are deprecated.
-Use <a href="#lua_objlen"><code>lua_objlen</code></a> instead of <code>luaL_getn</code>
-and nothing instead of <code>luaL_setn</code>.
-</li>
-
-<li>
-Function <code>luaL_openlib</code> was replaced by <a href="#luaL_register"><code>luaL_register</code></a>.
-</li>
-
-<li>
-Function <code>luaL_checkudata</code> now throws an error when the given value
-is not a userdata of the expected type.
-(In Lua 5.0 it returned <code>NULL</code>.)
-</li>
-
-</ul>
-
-
-
-
-<h1>8 - <a name="8">The Complete Syntax of Lua</a></h1>
-
-<p>
-Here is the complete syntax of Lua in extended BNF.
-(It does not describe operator precedences.)
-
-
-
-
-<pre>
-
- chunk ::= {stat [`<b>;</b>´]} [laststat [`<b>;</b>´]]
-
- block ::= chunk
-
- stat ::= varlist `<b>=</b>´ explist |
- functioncall |
- <b>do</b> block <b>end</b> |
- <b>while</b> exp <b>do</b> block <b>end</b> |
- <b>repeat</b> block <b>until</b> exp |
- <b>if</b> exp <b>then</b> block {<b>elseif</b> exp <b>then</b> block} [<b>else</b> block] <b>end</b> |
- <b>for</b> Name `<b>=</b>´ exp `<b>,</b>´ exp [`<b>,</b>´ exp] <b>do</b> block <b>end</b> |
- <b>for</b> namelist <b>in</b> explist <b>do</b> block <b>end</b> |
- <b>function</b> funcname funcbody |
- <b>local</b> <b>function</b> Name funcbody |
- <b>local</b> namelist [`<b>=</b>´ explist]
-
- laststat ::= <b>return</b> [explist] | <b>break</b>
-
- funcname ::= Name {`<b>.</b>´ Name} [`<b>:</b>´ Name]
-
- varlist ::= var {`<b>,</b>´ var}
-
- var ::= Name | prefixexp `<b>[</b>´ exp `<b>]</b>´ | prefixexp `<b>.</b>´ Name
-
- namelist ::= Name {`<b>,</b>´ Name}
-
- explist ::= {exp `<b>,</b>´} exp
-
- exp ::= <b>nil</b> | <b>false</b> | <b>true</b> | Number | String | `<b>...</b>´ | function |
- prefixexp | tableconstructor | exp binop exp | unop exp
-
- prefixexp ::= var | functioncall | `<b>(</b>´ exp `<b>)</b>´
-
- functioncall ::= prefixexp args | prefixexp `<b>:</b>´ Name args
-
- args ::= `<b>(</b>´ [explist] `<b>)</b>´ | tableconstructor | String
-
- function ::= <b>function</b> funcbody
-
- funcbody ::= `<b>(</b>´ [parlist] `<b>)</b>´ block <b>end</b>
-
- parlist ::= namelist [`<b>,</b>´ `<b>...</b>´] | `<b>...</b>´
-
- tableconstructor ::= `<b>{</b>´ [fieldlist] `<b>}</b>´
-
- fieldlist ::= field {fieldsep field} [fieldsep]
-
- field ::= `<b>[</b>´ exp `<b>]</b>´ `<b>=</b>´ exp | Name `<b>=</b>´ exp | exp
-
- fieldsep ::= `<b>,</b>´ | `<b>;</b>´
-
- binop ::= `<b>+</b>´ | `<b>-</b>´ | `<b>*</b>´ | `<b>/</b>´ | `<b>^</b>´ | `<b>%</b>´ | `<b>..</b>´ |
- `<b><</b>´ | `<b><=</b>´ | `<b>></b>´ | `<b>>=</b>´ | `<b>==</b>´ | `<b>~=</b>´ |
- <b>and</b> | <b>or</b>
-
- unop ::= `<b>-</b>´ | <b>not</b> | `<b>#</b>´
-
-</pre>
-
-<p>
-
-
-
-
-
-
-
-<HR>
-<SMALL>
-Last update:
-Mon Aug 18 13:25:46 BRT 2008
-</SMALL>
-<!--
-Last change: revised for Lua 5.1.4
--->
-
-</body></html>
+++ /dev/null
-<HTML>
-<HEAD>
-<TITLE>Lua documentation</TITLE>
-<LINK REL="stylesheet" TYPE="text/css" HREF="lua.css">
-</HEAD>
-
-<BODY>
-
-<HR>
-<H1>
-<A HREF="http://www.lua.org/"><IMG SRC="logo.gif" ALT="Lua" BORDER=0></A>
-Documentation
-</H1>
-
-This is the documentation included in the source distribution of Lua 5.1.4.
-
-<UL>
-<LI><A HREF="contents.html">Reference manual</A>
-<LI><A HREF="lua.html">lua man page</A>
-<LI><A HREF="luac.html">luac man page</A>
-<LI><A HREF="../README">lua/README</A>
-<LI><A HREF="../etc/README">lua/etc/README</A>
-<LI><A HREF="../test/README">lua/test/README</A>
-</UL>
-
-Lua's
-<A HREF="http://www.lua.org/">official web site</A>
-contains updated documentation,
-especially the
-<A HREF="http://www.lua.org/manual/5.1/">reference manual</A>.
-<P>
-
-<HR>
-<SMALL>
-Last update:
-Tue Aug 12 14:46:07 BRT 2008
-</SMALL>
-
-</BODY>
-</HTML>
+++ /dev/null
-# makefile for Lua etc
-
-TOP= ..
-LIB= $(TOP)/src
-INC= $(TOP)/src
-BIN= $(TOP)/src
-SRC= $(TOP)/src
-TST= $(TOP)/test
-
-CC= gcc
-CFLAGS= -O2 -Wall -I$(INC) $(MYCFLAGS)
-MYCFLAGS=
-MYLDFLAGS= -Wl,-E
-MYLIBS= -lm
-#MYLIBS= -lm -Wl,-E -ldl -lreadline -lhistory -lncurses
-RM= rm -f
-
-default:
- @echo 'Please choose a target: min noparser one strict clean'
-
-min: min.c
- $(CC) $(CFLAGS) $@.c -L$(LIB) -llua $(MYLIBS)
- echo 'print"Hello there!"' | ./a.out
-
-noparser: noparser.o
- $(CC) noparser.o $(SRC)/lua.o -L$(LIB) -llua $(MYLIBS)
- $(BIN)/luac $(TST)/hello.lua
- -./a.out luac.out
- -./a.out -e'a=1'
-
-one:
- $(CC) $(CFLAGS) all.c $(MYLIBS)
- ./a.out $(TST)/hello.lua
-
-strict:
- -$(BIN)/lua -e 'print(a);b=2'
- -$(BIN)/lua -lstrict -e 'print(a)'
- -$(BIN)/lua -e 'function f() b=2 end f()'
- -$(BIN)/lua -lstrict -e 'function f() b=2 end f()'
-
-clean:
- $(RM) a.out core core.* *.o luac.out
-
-.PHONY: default min noparser one strict clean
+++ /dev/null
-This directory contains some useful files and code.
-Unlike the code in ../src, everything here is in the public domain.
-
-If any of the makes fail, you're probably not using the same libraries
-used to build Lua. Set MYLIBS in Makefile accordingly.
-
-all.c
- Full Lua interpreter in a single file.
- Do "make one" for a demo.
-
-lua.hpp
- Lua header files for C++ using 'extern "C"'.
-
-lua.ico
- A Lua icon for Windows (and web sites: save as favicon.ico).
- Drawn by hand by Markus Gritsch <gritsch@iue.tuwien.ac.at>.
-
-lua.pc
- pkg-config data for Lua
-
-luavs.bat
- Script to build Lua under "Visual Studio .NET Command Prompt".
- Run it from the toplevel as etc\luavs.bat.
-
-min.c
- A minimal Lua interpreter.
- Good for learning and for starting your own.
- Do "make min" for a demo.
-
-noparser.c
- Linking with noparser.o avoids loading the parsing modules in lualib.a.
- Do "make noparser" for a demo.
-
-strict.lua
- Traps uses of undeclared global variables.
- Do "make strict" for a demo.
+++ /dev/null
-/*
-* all.c -- Lua core, libraries and interpreter in a single file
-*/
-
-#define luaall_c
-
-#include "lapi.c"
-#include "lcode.c"
-#include "ldebug.c"
-#include "ldo.c"
-#include "ldump.c"
-#include "lfunc.c"
-#include "lgc.c"
-#include "llex.c"
-#include "lmem.c"
-#include "lobject.c"
-#include "lopcodes.c"
-#include "lparser.c"
-#include "lstate.c"
-#include "lstring.c"
-#include "ltable.c"
-#include "ltm.c"
-#include "lundump.c"
-#include "lvm.c"
-#include "lzio.c"
-
-#include "lauxlib.c"
-#include "lbaselib.c"
-#include "ldblib.c"
-#include "liolib.c"
-#include "linit.c"
-#include "lmathlib.c"
-#include "loadlib.c"
-#include "loslib.c"
-#include "lstrlib.c"
-#include "ltablib.c"
-
-#include "lua.c"
+++ /dev/null
-// lua.hpp
-// Lua header files for C++
-// <<extern "C">> not supplied automatically because Lua also compiles as C++
-
-extern "C" {
-#include "lua.h"
-#include "lualib.h"
-#include "lauxlib.h"
-}
+++ /dev/null
-@rem Script to build Lua under "Visual Studio .NET Command Prompt".
-@rem Do not run from this directory; run it from the toplevel: etc\luavs.bat .
-@rem It creates lua51.dll, lua51.lib, lua.exe, and luac.exe in src.
-@rem (contributed by David Manura and Mike Pall)
-
-@setlocal
-@set MYCOMPILE=cl /nologo /MD /O2 /W3 /c /D_CRT_SECURE_NO_DEPRECATE
-@set MYLINK=link /nologo
-@set MYMT=mt /nologo
-
-cd src
-%MYCOMPILE% /DLUA_BUILD_AS_DLL l*.c
-del lua.obj luac.obj
-%MYLINK% /DLL /out:lua51.dll l*.obj
-if exist lua51.dll.manifest^
- %MYMT% -manifest lua51.dll.manifest -outputresource:lua51.dll;2
-%MYCOMPILE% /DLUA_BUILD_AS_DLL lua.c
-%MYLINK% /out:lua.exe lua.obj lua51.lib
-if exist lua.exe.manifest^
- %MYMT% -manifest lua.exe.manifest -outputresource:lua.exe
-%MYCOMPILE% l*.c print.c
-del lua.obj linit.obj lbaselib.obj ldblib.obj liolib.obj lmathlib.obj^
- loslib.obj ltablib.obj lstrlib.obj loadlib.obj
-%MYLINK% /out:luac.exe *.obj
-if exist luac.exe.manifest^
- %MYMT% -manifest luac.exe.manifest -outputresource:luac.exe
-del *.obj *.manifest
-cd ..
+++ /dev/null
-/*
-* min.c -- a minimal Lua interpreter
-* loads stdin only with minimal error handling.
-* no interaction, and no standard library, only a "print" function.
-*/
-
-#include <stdio.h>
-
-#include "lua.h"
-#include "lauxlib.h"
-
-static int print(lua_State *L)
-{
- int n=lua_gettop(L);
- int i;
- for (i=1; i<=n; i++)
- {
- if (i>1) printf("\t");
- if (lua_isstring(L,i))
- printf("%s",lua_tostring(L,i));
- else if (lua_isnil(L,i))
- printf("%s","nil");
- else if (lua_isboolean(L,i))
- printf("%s",lua_toboolean(L,i) ? "true" : "false");
- else
- printf("%s:%p",luaL_typename(L,i),lua_topointer(L,i));
- }
- printf("\n");
- return 0;
-}
-
-int main(void)
-{
- lua_State *L=lua_open();
- lua_register(L,"print",print);
- if (luaL_dofile(L,NULL)!=0) fprintf(stderr,"%s\n",lua_tostring(L,-1));
- lua_close(L);
- return 0;
-}
+++ /dev/null
-/*
-* The code below can be used to make a Lua core that does not contain the
-* parsing modules (lcode, llex, lparser), which represent 35% of the total core.
-* You'll only be able to load binary files and strings, precompiled with luac.
-* (Of course, you'll have to build luac with the original parsing modules!)
-*
-* To use this module, simply compile it ("make noparser" does that) and list
-* its object file before the Lua libraries. The linker should then not load
-* the parsing modules. To try it, do "make luab".
-*
-* If you also want to avoid the dump module (ldump.o), define NODUMP.
-* #define NODUMP
-*/
-
-#define LUA_CORE
-
-#include "llex.h"
-#include "lparser.h"
-#include "lzio.h"
-
-LUAI_FUNC void luaX_init (lua_State *L) {
- UNUSED(L);
-}
-
-LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, const char *name) {
- UNUSED(z);
- UNUSED(buff);
- UNUSED(name);
- lua_pushliteral(L,"parser not loaded");
- lua_error(L);
- return NULL;
-}
-
-#ifdef NODUMP
-#include "lundump.h"
-
-LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip) {
- UNUSED(f);
- UNUSED(w);
- UNUSED(data);
- UNUSED(strip);
-#if 1
- UNUSED(L);
- return 0;
-#else
- lua_pushliteral(L,"dumper not loaded");
- lua_error(L);
-#endif
-}
-#endif
+++ /dev/null
---
--- strict.lua
--- checks uses of undeclared global variables
--- All global variables must be 'declared' through a regular assignment
--- (even assigning nil will do) in a main chunk before being used
--- anywhere or assigned to inside a function.
---
-
-local getinfo, error, rawset, rawget = debug.getinfo, error, rawset, rawget
-
-local mt = getmetatable(_G)
-if mt == nil then
- mt = {}
- setmetatable(_G, mt)
-end
-
-mt.__declared = {}
-
-local function what ()
- local d = getinfo(3, "S")
- return d and d.what or "C"
-end
-
-mt.__newindex = function (t, n, v)
- if not mt.__declared[n] then
- local w = what()
- if w ~= "main" and w ~= "C" then
- error("assign to undeclared variable '"..n.."'", 2)
- end
- mt.__declared[n] = true
- end
- rawset(t, n, v)
-end
-
-mt.__index = function (t, n)
- if not mt.__declared[n] and what() ~= "C" then
- error("variable '"..n.."' is not declared", 2)
- end
- return rawget(t, n)
-end
+++ /dev/null
-# makefile for building Lua
-# see ../INSTALL for installation instructions
-# see ../Makefile and luaconf.h for further customization
-
-# == CHANGE THE SETTINGS BELOW TO SUIT YOUR ENVIRONMENT =======================
-
-# Your platform. See PLATS for possible values.
-PLAT= none
-
-CC= gcc
-CFLAGS= -O2 -Wall $(MYCFLAGS)
-AR= ar rcu
-RANLIB= ranlib
-RM= rm -f
-LIBS= -lm $(MYLIBS)
-
-MYCFLAGS=
-MYLDFLAGS=
-MYLIBS=
-
-# == END OF USER SETTINGS. NO NEED TO CHANGE ANYTHING BELOW THIS LINE =========
-
-PLATS= aix ansi bsd freebsd generic linux macosx mingw posix solaris
-
-LUA_A= liblua.a
-CORE_O= lapi.o lcode.o ldebug.o ldo.o ldump.o lfunc.o lgc.o llex.o lmem.o \
- lobject.o lopcodes.o lparser.o lstate.o lstring.o ltable.o ltm.o \
- lundump.o lvm.o lzio.o
-LIB_O= lauxlib.o lbaselib.o ldblib.o liolib.o lmathlib.o loslib.o ltablib.o \
- lstrlib.o loadlib.o linit.o
-
-LUA_T= lua
-LUA_O= lua.o
-
-LUAC_T= luac
-LUAC_O= luac.o print.o
-
-ALL_O= $(CORE_O) $(LIB_O) $(LUA_O) $(LUAC_O)
-ALL_T= $(LUA_A) $(LUA_T) $(LUAC_T)
-ALL_A= $(LUA_A)
-
-default: $(PLAT)
-
-all: $(ALL_T)
-
-o: $(ALL_O)
-
-a: $(ALL_A)
-
-$(LUA_A): $(CORE_O) $(LIB_O)
- $(AR) $@ $?
- $(RANLIB) $@
-
-$(LUA_T): $(LUA_O) $(LUA_A)
- $(CC) -o $@ $(MYLDFLAGS) $(LUA_O) $(LUA_A) $(LIBS)
-
-$(LUAC_T): $(LUAC_O) $(LUA_A)
- $(CC) -o $@ $(MYLDFLAGS) $(LUAC_O) $(LUA_A) $(LIBS)
-
-clean:
- $(RM) $(ALL_T) $(ALL_O)
-
-depend:
- @$(CC) $(CFLAGS) -MM l*.c print.c
-
-echo:
- @echo "PLAT = $(PLAT)"
- @echo "CC = $(CC)"
- @echo "CFLAGS = $(CFLAGS)"
- @echo "AR = $(AR)"
- @echo "RANLIB = $(RANLIB)"
- @echo "RM = $(RM)"
- @echo "MYCFLAGS = $(MYCFLAGS)"
- @echo "MYLDFLAGS = $(MYLDFLAGS)"
- @echo "MYLIBS = $(MYLIBS)"
-
-# convenience targets for popular platforms
-
-none:
- @echo "Please choose a platform:"
- @echo " $(PLATS)"
-
-aix:
- $(MAKE) all CC="xlc" CFLAGS="-O2 -DLUA_USE_POSIX -DLUA_USE_DLOPEN" MYLIBS="-ldl" MYLDFLAGS="-brtl -bexpall"
-
-ansi:
- $(MAKE) all MYCFLAGS=-DLUA_ANSI
-
-bsd:
- $(MAKE) all MYCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" MYLIBS="-Wl,-E"
-
-freebsd:
- $(MAKE) all MYCFLAGS="-DLUA_USE_LINUX" MYLIBS="-Wl,-E -lreadline"
-
-generic:
- $(MAKE) all MYCFLAGS=
-
-linux:
- $(MAKE) all MYCFLAGS=-DLUA_USE_LINUX MYLIBS="-Wl,-E -ldl -lreadline -lhistory -lncurses"
-
-macosx:
- $(MAKE) all MYCFLAGS=-DLUA_USE_LINUX MYLIBS="-lreadline"
-# use this on Mac OS X 10.3-
-# $(MAKE) all MYCFLAGS=-DLUA_USE_MACOSX
-
-mingw:
- $(MAKE) "LUA_A=lua51.dll" "LUA_T=lua.exe" \
- "AR=$(CC) -shared -o" "RANLIB=strip --strip-unneeded" \
- "MYCFLAGS=-DLUA_BUILD_AS_DLL" "MYLIBS=" "MYLDFLAGS=-s" lua.exe
- $(MAKE) "LUAC_T=luac.exe" luac.exe
-
-posix:
- $(MAKE) all MYCFLAGS=-DLUA_USE_POSIX
-
-solaris:
- $(MAKE) all MYCFLAGS="-DLUA_USE_POSIX -DLUA_USE_DLOPEN" MYLIBS="-ldl"
-
-# list targets that do not create files (but not all makes understand .PHONY)
-.PHONY: all $(PLATS) default o a clean depend echo none
-
-# DO NOT DELETE
-
-lapi.o: lapi.c lua.h luaconf.h lapi.h lobject.h llimits.h ldebug.h \
- lstate.h ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h \
- lundump.h lvm.h
-lauxlib.o: lauxlib.c lua.h luaconf.h lauxlib.h
-lbaselib.o: lbaselib.c lua.h luaconf.h lauxlib.h lualib.h
-lcode.o: lcode.c lua.h luaconf.h lcode.h llex.h lobject.h llimits.h \
- lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h ldo.h lgc.h \
- ltable.h
-ldblib.o: ldblib.c lua.h luaconf.h lauxlib.h lualib.h
-ldebug.o: ldebug.c lua.h luaconf.h lapi.h lobject.h llimits.h lcode.h \
- llex.h lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h ldo.h \
- lfunc.h lstring.h lgc.h ltable.h lvm.h
-ldo.o: ldo.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h ltm.h \
- lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lparser.h lstring.h \
- ltable.h lundump.h lvm.h
-ldump.o: ldump.c lua.h luaconf.h lobject.h llimits.h lstate.h ltm.h \
- lzio.h lmem.h lundump.h
-lfunc.o: lfunc.c lua.h luaconf.h lfunc.h lobject.h llimits.h lgc.h lmem.h \
- lstate.h ltm.h lzio.h
-lgc.o: lgc.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h ltm.h \
- lzio.h lmem.h ldo.h lfunc.h lgc.h lstring.h ltable.h
-linit.o: linit.c lua.h luaconf.h lualib.h lauxlib.h
-liolib.o: liolib.c lua.h luaconf.h lauxlib.h lualib.h
-llex.o: llex.c lua.h luaconf.h ldo.h lobject.h llimits.h lstate.h ltm.h \
- lzio.h lmem.h llex.h lparser.h lstring.h lgc.h ltable.h
-lmathlib.o: lmathlib.c lua.h luaconf.h lauxlib.h lualib.h
-lmem.o: lmem.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h \
- ltm.h lzio.h lmem.h ldo.h
-loadlib.o: loadlib.c lua.h luaconf.h lauxlib.h lualib.h
-lobject.o: lobject.c lua.h luaconf.h ldo.h lobject.h llimits.h lstate.h \
- ltm.h lzio.h lmem.h lstring.h lgc.h lvm.h
-lopcodes.o: lopcodes.c lopcodes.h llimits.h lua.h luaconf.h
-loslib.o: loslib.c lua.h luaconf.h lauxlib.h lualib.h
-lparser.o: lparser.c lua.h luaconf.h lcode.h llex.h lobject.h llimits.h \
- lzio.h lmem.h lopcodes.h lparser.h ldebug.h lstate.h ltm.h ldo.h \
- lfunc.h lstring.h lgc.h ltable.h
-lstate.o: lstate.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h \
- ltm.h lzio.h lmem.h ldo.h lfunc.h lgc.h llex.h lstring.h ltable.h
-lstring.o: lstring.c lua.h luaconf.h lmem.h llimits.h lobject.h lstate.h \
- ltm.h lzio.h lstring.h lgc.h
-lstrlib.o: lstrlib.c lua.h luaconf.h lauxlib.h lualib.h
-ltable.o: ltable.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h \
- ltm.h lzio.h lmem.h ldo.h lgc.h ltable.h
-ltablib.o: ltablib.c lua.h luaconf.h lauxlib.h lualib.h
-ltm.o: ltm.c lua.h luaconf.h lobject.h llimits.h lstate.h ltm.h lzio.h \
- lmem.h lstring.h lgc.h ltable.h
-lua.o: lua.c lua.h luaconf.h lauxlib.h lualib.h
-luac.o: luac.c lua.h luaconf.h lauxlib.h ldo.h lobject.h llimits.h \
- lstate.h ltm.h lzio.h lmem.h lfunc.h lopcodes.h lstring.h lgc.h \
- lundump.h
-lundump.o: lundump.c lua.h luaconf.h ldebug.h lstate.h lobject.h \
- llimits.h ltm.h lzio.h lmem.h ldo.h lfunc.h lstring.h lgc.h lundump.h
-lvm.o: lvm.c lua.h luaconf.h ldebug.h lstate.h lobject.h llimits.h ltm.h \
- lzio.h lmem.h ldo.h lfunc.h lgc.h lopcodes.h lstring.h ltable.h lvm.h
-lzio.o: lzio.c lua.h luaconf.h llimits.h lmem.h lstate.h lobject.h ltm.h \
- lzio.h
-print.o: print.c ldebug.h lstate.h lua.h luaconf.h lobject.h llimits.h \
- ltm.h lzio.h lmem.h lopcodes.h lundump.h
-
-# (end of Makefile)
+++ /dev/null
-/*
-** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
-** Lua API
-** See Copyright Notice in lua.h
-*/
-
-
-#include <assert.h>
-#include <math.h>
-#include <stdarg.h>
-#include <string.h>
-
-#define lapi_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lapi.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lundump.h"
-#include "lvm.h"
-
-
-
-const char lua_ident[] =
- "$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
- "$Authors: " LUA_AUTHORS " $\n"
- "$URL: www.lua.org $\n";
-
-
-
-#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
-
-#define api_checkvalidindex(L, i) api_check(L, (i) != luaO_nilobject)
-
-#define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
-
-
-
-static TValue *index2adr (lua_State *L, int idx) {
- if (idx > 0) {
- TValue *o = L->base + (idx - 1);
- api_check(L, idx <= L->ci->top - L->base);
- if (o >= L->top) return cast(TValue *, luaO_nilobject);
- else return o;
- }
- else if (idx > LUA_REGISTRYINDEX) {
- api_check(L, idx != 0 && -idx <= L->top - L->base);
- return L->top + idx;
- }
- else switch (idx) { /* pseudo-indices */
- case LUA_REGISTRYINDEX: return registry(L);
- case LUA_ENVIRONINDEX: {
- Closure *func = curr_func(L);
- sethvalue(L, &L->env, func->c.env);
- return &L->env;
- }
- case LUA_GLOBALSINDEX: return gt(L);
- default: {
- Closure *func = curr_func(L);
- idx = LUA_GLOBALSINDEX - idx;
- return (idx <= func->c.nupvalues)
- ? &func->c.upvalue[idx-1]
- : cast(TValue *, luaO_nilobject);
- }
- }
-}
-
-
-static Table *getcurrenv (lua_State *L) {
- if (L->ci == L->base_ci) /* no enclosing function? */
- return hvalue(gt(L)); /* use global table as environment */
- else {
- Closure *func = curr_func(L);
- return func->c.env;
- }
-}
-
-
-void luaA_pushobject (lua_State *L, const TValue *o) {
- setobj2s(L, L->top, o);
- api_incr_top(L);
-}
-
-
-LUA_API int lua_checkstack (lua_State *L, int size) {
- int res = 1;
- lua_lock(L);
- if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
- res = 0; /* stack overflow */
- else if (size > 0) {
- luaD_checkstack(L, size);
- if (L->ci->top < L->top + size)
- L->ci->top = L->top + size;
- }
- lua_unlock(L);
- return res;
-}
-
-
-LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
- int i;
- if (from == to) return;
- lua_lock(to);
- api_checknelems(from, n);
- api_check(from, G(from) == G(to));
- api_check(from, to->ci->top - to->top >= n);
- from->top -= n;
- for (i = 0; i < n; i++) {
- setobj2s(to, to->top++, from->top + i);
- }
- lua_unlock(to);
-}
-
-
-LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
- to->nCcalls = from->nCcalls;
-}
-
-
-LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
- lua_CFunction old;
- lua_lock(L);
- old = G(L)->panic;
- G(L)->panic = panicf;
- lua_unlock(L);
- return old;
-}
-
-
-LUA_API lua_State *lua_newthread (lua_State *L) {
- lua_State *L1;
- lua_lock(L);
- luaC_checkGC(L);
- L1 = luaE_newthread(L);
- setthvalue(L, L->top, L1);
- api_incr_top(L);
- lua_unlock(L);
- luai_userstatethread(L, L1);
- return L1;
-}
-
-
-
-/*
-** basic stack manipulation
-*/
-
-
-LUA_API int lua_gettop (lua_State *L) {
- return cast_int(L->top - L->base);
-}
-
-
-LUA_API void lua_settop (lua_State *L, int idx) {
- lua_lock(L);
- if (idx >= 0) {
- api_check(L, idx <= L->stack_last - L->base);
- while (L->top < L->base + idx)
- setnilvalue(L->top++);
- L->top = L->base + idx;
- }
- else {
- api_check(L, -(idx+1) <= (L->top - L->base));
- L->top += idx+1; /* `subtract' index (index is negative) */
- }
- lua_unlock(L);
-}
-
-
-LUA_API void lua_remove (lua_State *L, int idx) {
- StkId p;
- lua_lock(L);
- p = index2adr(L, idx);
- api_checkvalidindex(L, p);
- while (++p < L->top) setobjs2s(L, p-1, p);
- L->top--;
- lua_unlock(L);
-}
-
-
-LUA_API void lua_insert (lua_State *L, int idx) {
- StkId p;
- StkId q;
- lua_lock(L);
- p = index2adr(L, idx);
- api_checkvalidindex(L, p);
- for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
- setobjs2s(L, p, L->top);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_replace (lua_State *L, int idx) {
- StkId o;
- lua_lock(L);
- /* explicit test for incompatible code */
- if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
- luaG_runerror(L, "no calling environment");
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_checkvalidindex(L, o);
- if (idx == LUA_ENVIRONINDEX) {
- Closure *func = curr_func(L);
- api_check(L, ttistable(L->top - 1));
- func->c.env = hvalue(L->top - 1);
- luaC_barrier(L, func, L->top - 1);
- }
- else {
- setobj(L, o, L->top - 1);
- if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
- luaC_barrier(L, curr_func(L), L->top - 1);
- }
- L->top--;
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushvalue (lua_State *L, int idx) {
- lua_lock(L);
- setobj2s(L, L->top, index2adr(L, idx));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-
-/*
-** access functions (stack -> C)
-*/
-
-
-LUA_API int lua_type (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
-}
-
-
-LUA_API const char *lua_typename (lua_State *L, int t) {
- UNUSED(L);
- return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
-}
-
-
-LUA_API int lua_iscfunction (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return iscfunction(o);
-}
-
-
-LUA_API int lua_isnumber (lua_State *L, int idx) {
- TValue n;
- const TValue *o = index2adr(L, idx);
- return tonumber(o, &n);
-}
-
-
-LUA_API int lua_isstring (lua_State *L, int idx) {
- int t = lua_type(L, idx);
- return (t == LUA_TSTRING || t == LUA_TNUMBER);
-}
-
-
-LUA_API int lua_isuserdata (lua_State *L, int idx) {
- const TValue *o = index2adr(L, idx);
- return (ttisuserdata(o) || ttislightuserdata(o));
-}
-
-
-LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
- StkId o1 = index2adr(L, index1);
- StkId o2 = index2adr(L, index2);
- return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
- : luaO_rawequalObj(o1, o2);
-}
-
-
-LUA_API int lua_equal (lua_State *L, int index1, int index2) {
- StkId o1, o2;
- int i;
- lua_lock(L); /* may call tag method */
- o1 = index2adr(L, index1);
- o2 = index2adr(L, index2);
- i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
- lua_unlock(L);
- return i;
-}
-
-
-LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
- StkId o1, o2;
- int i;
- lua_lock(L); /* may call tag method */
- o1 = index2adr(L, index1);
- o2 = index2adr(L, index2);
- i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
- : luaV_lessthan(L, o1, o2);
- lua_unlock(L);
- return i;
-}
-
-
-
-LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
- TValue n;
- const TValue *o = index2adr(L, idx);
- if (tonumber(o, &n))
- return nvalue(o);
- else
- return 0;
-}
-
-
-LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
- TValue n;
- const TValue *o = index2adr(L, idx);
- if (tonumber(o, &n)) {
- lua_Integer res;
- lua_Number num = nvalue(o);
- lua_number2integer(res, num);
- return res;
- }
- else
- return 0;
-}
-
-
-LUA_API int lua_toboolean (lua_State *L, int idx) {
- const TValue *o = index2adr(L, idx);
- return !l_isfalse(o);
-}
-
-
-LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
- StkId o = index2adr(L, idx);
- if (!ttisstring(o)) {
- lua_lock(L); /* `luaV_tostring' may create a new string */
- if (!luaV_tostring(L, o)) { /* conversion failed? */
- if (len != NULL) *len = 0;
- lua_unlock(L);
- return NULL;
- }
- luaC_checkGC(L);
- o = index2adr(L, idx); /* previous call may reallocate the stack */
- lua_unlock(L);
- }
- if (len != NULL) *len = tsvalue(o)->len;
- return svalue(o);
-}
-
-
-LUA_API size_t lua_objlen (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- switch (ttype(o)) {
- case LUA_TSTRING: return tsvalue(o)->len;
- case LUA_TUSERDATA: return uvalue(o)->len;
- case LUA_TTABLE: return luaH_getn(hvalue(o));
- case LUA_TNUMBER: {
- size_t l;
- lua_lock(L); /* `luaV_tostring' may create a new string */
- l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
- lua_unlock(L);
- return l;
- }
- default: return 0;
- }
-}
-
-
-LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
-}
-
-
-LUA_API void *lua_touserdata (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- switch (ttype(o)) {
- case LUA_TUSERDATA: return (rawuvalue(o) + 1);
- case LUA_TLIGHTUSERDATA: return pvalue(o);
- default: return NULL;
- }
-}
-
-
-LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (!ttisthread(o)) ? NULL : thvalue(o);
-}
-
-
-LUA_API const void *lua_topointer (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- switch (ttype(o)) {
- case LUA_TTABLE: return hvalue(o);
- case LUA_TFUNCTION: return clvalue(o);
- case LUA_TTHREAD: return thvalue(o);
- case LUA_TUSERDATA:
- case LUA_TLIGHTUSERDATA:
- return lua_touserdata(L, idx);
- default: return NULL;
- }
-}
-
-
-
-/*
-** push functions (C -> stack)
-*/
-
-
-LUA_API void lua_pushnil (lua_State *L) {
- lua_lock(L);
- setnilvalue(L->top);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
- lua_lock(L);
- setnvalue(L->top, n);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
- lua_lock(L);
- setnvalue(L->top, cast_num(n));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
- lua_lock(L);
- luaC_checkGC(L);
- setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushstring (lua_State *L, const char *s) {
- if (s == NULL)
- lua_pushnil(L);
- else
- lua_pushlstring(L, s, strlen(s));
-}
-
-
-LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
- va_list argp) {
- const char *ret;
- lua_lock(L);
- luaC_checkGC(L);
- ret = luaO_pushvfstring(L, fmt, argp);
- lua_unlock(L);
- return ret;
-}
-
-
-LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
- const char *ret;
- va_list argp;
- lua_lock(L);
- luaC_checkGC(L);
- va_start(argp, fmt);
- ret = luaO_pushvfstring(L, fmt, argp);
- va_end(argp);
- lua_unlock(L);
- return ret;
-}
-
-
-LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
- Closure *cl;
- lua_lock(L);
- luaC_checkGC(L);
- api_checknelems(L, n);
- cl = luaF_newCclosure(L, n, getcurrenv(L));
- cl->c.f = fn;
- L->top -= n;
- while (n--)
- setobj2n(L, &cl->c.upvalue[n], L->top+n);
- setclvalue(L, L->top, cl);
- lua_assert(iswhite(obj2gco(cl)));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushboolean (lua_State *L, int b) {
- lua_lock(L);
- setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
- lua_lock(L);
- setpvalue(L->top, p);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API int lua_pushthread (lua_State *L) {
- lua_lock(L);
- setthvalue(L, L->top, L);
- api_incr_top(L);
- lua_unlock(L);
- return (G(L)->mainthread == L);
-}
-
-
-
-/*
-** get functions (Lua -> stack)
-*/
-
-
-LUA_API void lua_gettable (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- luaV_gettable(L, t, L->top - 1, L->top - 1);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
- StkId t;
- TValue key;
- lua_lock(L);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- setsvalue(L, &key, luaS_new(L, k));
- luaV_gettable(L, t, &key, L->top);
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawget (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
- StkId o;
- lua_lock(L);
- o = index2adr(L, idx);
- api_check(L, ttistable(o));
- setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
- lua_lock(L);
- luaC_checkGC(L);
- sethvalue(L, L->top, luaH_new(L, narray, nrec));
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-LUA_API int lua_getmetatable (lua_State *L, int objindex) {
- const TValue *obj;
- Table *mt = NULL;
- int res;
- lua_lock(L);
- obj = index2adr(L, objindex);
- switch (ttype(obj)) {
- case LUA_TTABLE:
- mt = hvalue(obj)->metatable;
- break;
- case LUA_TUSERDATA:
- mt = uvalue(obj)->metatable;
- break;
- default:
- mt = G(L)->mt[ttype(obj)];
- break;
- }
- if (mt == NULL)
- res = 0;
- else {
- sethvalue(L, L->top, mt);
- api_incr_top(L);
- res = 1;
- }
- lua_unlock(L);
- return res;
-}
-
-
-LUA_API void lua_getfenv (lua_State *L, int idx) {
- StkId o;
- lua_lock(L);
- o = index2adr(L, idx);
- api_checkvalidindex(L, o);
- switch (ttype(o)) {
- case LUA_TFUNCTION:
- sethvalue(L, L->top, clvalue(o)->c.env);
- break;
- case LUA_TUSERDATA:
- sethvalue(L, L->top, uvalue(o)->env);
- break;
- case LUA_TTHREAD:
- setobj2s(L, L->top, gt(thvalue(o)));
- break;
- default:
- setnilvalue(L->top);
- break;
- }
- api_incr_top(L);
- lua_unlock(L);
-}
-
-
-/*
-** set functions (stack -> Lua)
-*/
-
-
-LUA_API void lua_settable (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 2);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- luaV_settable(L, t, L->top - 2, L->top - 1);
- L->top -= 2; /* pop index and value */
- lua_unlock(L);
-}
-
-
-LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
- StkId t;
- TValue key;
- lua_lock(L);
- api_checknelems(L, 1);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- setsvalue(L, &key, luaS_new(L, k));
- luaV_settable(L, t, &key, L->top - 1);
- L->top--; /* pop value */
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawset (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 2);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
- luaC_barriert(L, hvalue(t), L->top-1);
- L->top -= 2;
- lua_unlock(L);
-}
-
-
-LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
- StkId o;
- lua_lock(L);
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_check(L, ttistable(o));
- setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
- luaC_barriert(L, hvalue(o), L->top-1);
- L->top--;
- lua_unlock(L);
-}
-
-
-LUA_API int lua_setmetatable (lua_State *L, int objindex) {
- TValue *obj;
- Table *mt;
- lua_lock(L);
- api_checknelems(L, 1);
- obj = index2adr(L, objindex);
- api_checkvalidindex(L, obj);
- if (ttisnil(L->top - 1))
- mt = NULL;
- else {
- api_check(L, ttistable(L->top - 1));
- mt = hvalue(L->top - 1);
- }
- switch (ttype(obj)) {
- case LUA_TTABLE: {
- hvalue(obj)->metatable = mt;
- if (mt)
- luaC_objbarriert(L, hvalue(obj), mt);
- break;
- }
- case LUA_TUSERDATA: {
- uvalue(obj)->metatable = mt;
- if (mt)
- luaC_objbarrier(L, rawuvalue(obj), mt);
- break;
- }
- default: {
- G(L)->mt[ttype(obj)] = mt;
- break;
- }
- }
- L->top--;
- lua_unlock(L);
- return 1;
-}
-
-
-LUA_API int lua_setfenv (lua_State *L, int idx) {
- StkId o;
- int res = 1;
- lua_lock(L);
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_checkvalidindex(L, o);
- api_check(L, ttistable(L->top - 1));
- switch (ttype(o)) {
- case LUA_TFUNCTION:
- clvalue(o)->c.env = hvalue(L->top - 1);
- break;
- case LUA_TUSERDATA:
- uvalue(o)->env = hvalue(L->top - 1);
- break;
- case LUA_TTHREAD:
- sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
- break;
- default:
- res = 0;
- break;
- }
- if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
- L->top--;
- lua_unlock(L);
- return res;
-}
-
-
-/*
-** `load' and `call' functions (run Lua code)
-*/
-
-
-#define adjustresults(L,nres) \
- { if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
-
-
-#define checkresults(L,na,nr) \
- api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
-
-
-LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
- StkId func;
- lua_lock(L);
- api_checknelems(L, nargs+1);
- checkresults(L, nargs, nresults);
- func = L->top - (nargs+1);
- luaD_call(L, func, nresults);
- adjustresults(L, nresults);
- lua_unlock(L);
-}
-
-
-
-/*
-** Execute a protected call.
-*/
-struct CallS { /* data to `f_call' */
- StkId func;
- int nresults;
-};
-
-
-static void f_call (lua_State *L, void *ud) {
- struct CallS *c = cast(struct CallS *, ud);
- luaD_call(L, c->func, c->nresults);
-}
-
-
-
-LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
- struct CallS c;
- int status;
- ptrdiff_t func;
- lua_lock(L);
- api_checknelems(L, nargs+1);
- checkresults(L, nargs, nresults);
- if (errfunc == 0)
- func = 0;
- else {
- StkId o = index2adr(L, errfunc);
- api_checkvalidindex(L, o);
- func = savestack(L, o);
- }
- c.func = L->top - (nargs+1); /* function to be called */
- c.nresults = nresults;
- status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
- adjustresults(L, nresults);
- lua_unlock(L);
- return status;
-}
-
-
-/*
-** Execute a protected C call.
-*/
-struct CCallS { /* data to `f_Ccall' */
- lua_CFunction func;
- void *ud;
-};
-
-
-static void f_Ccall (lua_State *L, void *ud) {
- struct CCallS *c = cast(struct CCallS *, ud);
- Closure *cl;
- cl = luaF_newCclosure(L, 0, getcurrenv(L));
- cl->c.f = c->func;
- setclvalue(L, L->top, cl); /* push function */
- api_incr_top(L);
- setpvalue(L->top, c->ud); /* push only argument */
- api_incr_top(L);
- luaD_call(L, L->top - 2, 0);
-}
-
-
-LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
- struct CCallS c;
- int status;
- lua_lock(L);
- c.func = func;
- c.ud = ud;
- status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
- const char *chunkname) {
- ZIO z;
- int status;
- lua_lock(L);
- if (!chunkname) chunkname = "?";
- luaZ_init(L, &z, reader, data);
- status = luaD_protectedparser(L, &z, chunkname);
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
- int status;
- TValue *o;
- lua_lock(L);
- api_checknelems(L, 1);
- o = L->top - 1;
- if (isLfunction(o))
- status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
- else
- status = 1;
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_status (lua_State *L) {
- return L->status;
-}
-
-
-/*
-** Garbage-collection function
-*/
-
-LUA_API int lua_gc (lua_State *L, int what, int data) {
- int res = 0;
- global_State *g;
- lua_lock(L);
- g = G(L);
- switch (what) {
- case LUA_GCSTOP: {
- g->GCthreshold = MAX_LUMEM;
- break;
- }
- case LUA_GCRESTART: {
- g->GCthreshold = g->totalbytes;
- break;
- }
- case LUA_GCCOLLECT: {
- luaC_fullgc(L);
- break;
- }
- case LUA_GCCOUNT: {
- /* GC values are expressed in Kbytes: #bytes/2^10 */
- res = cast_int(g->totalbytes >> 10);
- break;
- }
- case LUA_GCCOUNTB: {
- res = cast_int(g->totalbytes & 0x3ff);
- break;
- }
- case LUA_GCSTEP: {
- lu_mem a = (cast(lu_mem, data) << 10);
- if (a <= g->totalbytes)
- g->GCthreshold = g->totalbytes - a;
- else
- g->GCthreshold = 0;
- while (g->GCthreshold <= g->totalbytes) {
- luaC_step(L);
- if (g->gcstate == GCSpause) { /* end of cycle? */
- res = 1; /* signal it */
- break;
- }
- }
- break;
- }
- case LUA_GCSETPAUSE: {
- res = g->gcpause;
- g->gcpause = data;
- break;
- }
- case LUA_GCSETSTEPMUL: {
- res = g->gcstepmul;
- g->gcstepmul = data;
- break;
- }
- default: res = -1; /* invalid option */
- }
- lua_unlock(L);
- return res;
-}
-
-
-
-/*
-** miscellaneous functions
-*/
-
-
-LUA_API int lua_error (lua_State *L) {
- lua_lock(L);
- api_checknelems(L, 1);
- luaG_errormsg(L);
- lua_unlock(L);
- return 0; /* to avoid warnings */
-}
-
-
-LUA_API int lua_next (lua_State *L, int idx) {
- StkId t;
- int more;
- lua_lock(L);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- more = luaH_next(L, hvalue(t), L->top - 1);
- if (more) {
- api_incr_top(L);
- }
- else /* no more elements */
- L->top -= 1; /* remove key */
- lua_unlock(L);
- return more;
-}
-
-
-LUA_API void lua_concat (lua_State *L, int n) {
- lua_lock(L);
- api_checknelems(L, n);
- if (n >= 2) {
- luaC_checkGC(L);
- luaV_concat(L, n, cast_int(L->top - L->base) - 1);
- L->top -= (n-1);
- }
- else if (n == 0) { /* push empty string */
- setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
- api_incr_top(L);
- }
- /* else n == 1; nothing to do */
- lua_unlock(L);
-}
-
-
-LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
- lua_Alloc f;
- lua_lock(L);
- if (ud) *ud = G(L)->ud;
- f = G(L)->frealloc;
- lua_unlock(L);
- return f;
-}
-
-
-LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
- lua_lock(L);
- G(L)->ud = ud;
- G(L)->frealloc = f;
- lua_unlock(L);
-}
-
-
-LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
- Udata *u;
- lua_lock(L);
- luaC_checkGC(L);
- u = luaS_newudata(L, size, getcurrenv(L));
- setuvalue(L, L->top, u);
- api_incr_top(L);
- lua_unlock(L);
- return u + 1;
-}
-
-
-
-
-static const char *aux_upvalue (StkId fi, int n, TValue **val) {
- Closure *f;
- if (!ttisfunction(fi)) return NULL;
- f = clvalue(fi);
- if (f->c.isC) {
- if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
- *val = &f->c.upvalue[n-1];
- return "";
- }
- else {
- Proto *p = f->l.p;
- if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
- *val = f->l.upvals[n-1]->v;
- return getstr(p->upvalues[n-1]);
- }
-}
-
-
-LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
- const char *name;
- TValue *val;
- lua_lock(L);
- name = aux_upvalue(index2adr(L, funcindex), n, &val);
- if (name) {
- setobj2s(L, L->top, val);
- api_incr_top(L);
- }
- lua_unlock(L);
- return name;
-}
-
-
-LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
- const char *name;
- TValue *val;
- StkId fi;
- lua_lock(L);
- fi = index2adr(L, funcindex);
- api_checknelems(L, 1);
- name = aux_upvalue(fi, n, &val);
- if (name) {
- L->top--;
- setobj(L, val, L->top);
- luaC_barrier(L, clvalue(fi), L->top);
- }
- lua_unlock(L);
- return name;
-}
+++ /dev/null
-/*
-** $Id: lapi.h,v 2.2.1.1 2007/12/27 13:02:25 roberto Exp $
-** Auxiliary functions from Lua API
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lapi_h
-#define lapi_h
-
-
-#include "lobject.h"
-
-
-LUAI_FUNC void luaA_pushobject (lua_State *L, const TValue *o);
-
-#endif
+++ /dev/null
-/*
-** $Id: lauxlib.c,v 1.159.1.3 2008/01/21 13:20:51 roberto Exp $
-** Auxiliary functions for building Lua libraries
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-
-/* This file uses only the official API of Lua.
-** Any function declared here could be written as an application function.
-*/
-
-#define lauxlib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-
-
-#define FREELIST_REF 0 /* free list of references */
-
-
-/* convert a stack index to positive */
-#define abs_index(L, i) ((i) > 0 || (i) <= LUA_REGISTRYINDEX ? (i) : \
- lua_gettop(L) + (i) + 1)
-
-
-/*
-** {======================================================
-** Error-report functions
-** =======================================================
-*/
-
-
-LUALIB_API int luaL_argerror (lua_State *L, int narg, const char *extramsg) {
- lua_Debug ar;
- if (!lua_getstack(L, 0, &ar)) /* no stack frame? */
- return luaL_error(L, "bad argument #%d (%s)", narg, extramsg);
- lua_getinfo(L, "n", &ar);
- if (strcmp(ar.namewhat, "method") == 0) {
- narg--; /* do not count `self' */
- if (narg == 0) /* error is in the self argument itself? */
- return luaL_error(L, "calling " LUA_QS " on bad self (%s)",
- ar.name, extramsg);
- }
- if (ar.name == NULL)
- ar.name = "?";
- return luaL_error(L, "bad argument #%d to " LUA_QS " (%s)",
- narg, ar.name, extramsg);
-}
-
-
-LUALIB_API int luaL_typerror (lua_State *L, int narg, const char *tname) {
- const char *msg = lua_pushfstring(L, "%s expected, got %s",
- tname, luaL_typename(L, narg));
- return luaL_argerror(L, narg, msg);
-}
-
-
-static void tag_error (lua_State *L, int narg, int tag) {
- luaL_typerror(L, narg, lua_typename(L, tag));
-}
-
-
-LUALIB_API void luaL_where (lua_State *L, int level) {
- lua_Debug ar;
- if (lua_getstack(L, level, &ar)) { /* check function at level */
- lua_getinfo(L, "Sl", &ar); /* get info about it */
- if (ar.currentline > 0) { /* is there info? */
- lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
- return;
- }
- }
- lua_pushliteral(L, ""); /* else, no information available... */
-}
-
-
-LUALIB_API int luaL_error (lua_State *L, const char *fmt, ...) {
- va_list argp;
- va_start(argp, fmt);
- luaL_where(L, 1);
- lua_pushvfstring(L, fmt, argp);
- va_end(argp);
- lua_concat(L, 2);
- return lua_error(L);
-}
-
-/* }====================================================== */
-
-
-LUALIB_API int luaL_checkoption (lua_State *L, int narg, const char *def,
- const char *const lst[]) {
- const char *name = (def) ? luaL_optstring(L, narg, def) :
- luaL_checkstring(L, narg);
- int i;
- for (i=0; lst[i]; i++)
- if (strcmp(lst[i], name) == 0)
- return i;
- return luaL_argerror(L, narg,
- lua_pushfstring(L, "invalid option " LUA_QS, name));
-}
-
-
-LUALIB_API int luaL_newmetatable (lua_State *L, const char *tname) {
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get registry.name */
- if (!lua_isnil(L, -1)) /* name already in use? */
- return 0; /* leave previous value on top, but return 0 */
- lua_pop(L, 1);
- lua_newtable(L); /* create metatable */
- lua_pushvalue(L, -1);
- lua_setfield(L, LUA_REGISTRYINDEX, tname); /* registry.name = metatable */
- return 1;
-}
-
-
-LUALIB_API void *luaL_checkudata (lua_State *L, int ud, const char *tname) {
- void *p = lua_touserdata(L, ud);
- if (p != NULL) { /* value is a userdata? */
- if (lua_getmetatable(L, ud)) { /* does it have a metatable? */
- lua_getfield(L, LUA_REGISTRYINDEX, tname); /* get correct metatable */
- if (lua_rawequal(L, -1, -2)) { /* does it have the correct mt? */
- lua_pop(L, 2); /* remove both metatables */
- return p;
- }
- }
- }
- luaL_typerror(L, ud, tname); /* else error */
- return NULL; /* to avoid warnings */
-}
-
-
-LUALIB_API void luaL_checkstack (lua_State *L, int space, const char *mes) {
- if (!lua_checkstack(L, space))
- luaL_error(L, "stack overflow (%s)", mes);
-}
-
-
-LUALIB_API void luaL_checktype (lua_State *L, int narg, int t) {
- if (lua_type(L, narg) != t)
- tag_error(L, narg, t);
-}
-
-
-LUALIB_API void luaL_checkany (lua_State *L, int narg) {
- if (lua_type(L, narg) == LUA_TNONE)
- luaL_argerror(L, narg, "value expected");
-}
-
-
-LUALIB_API const char *luaL_checklstring (lua_State *L, int narg, size_t *len) {
- const char *s = lua_tolstring(L, narg, len);
- if (!s) tag_error(L, narg, LUA_TSTRING);
- return s;
-}
-
-
-LUALIB_API const char *luaL_optlstring (lua_State *L, int narg,
- const char *def, size_t *len) {
- if (lua_isnoneornil(L, narg)) {
- if (len)
- *len = (def ? strlen(def) : 0);
- return def;
- }
- else return luaL_checklstring(L, narg, len);
-}
-
-
-LUALIB_API lua_Number luaL_checknumber (lua_State *L, int narg) {
- lua_Number d = lua_tonumber(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
- tag_error(L, narg, LUA_TNUMBER);
- return d;
-}
-
-
-LUALIB_API lua_Number luaL_optnumber (lua_State *L, int narg, lua_Number def) {
- return luaL_opt(L, luaL_checknumber, narg, def);
-}
-
-
-LUALIB_API lua_Integer luaL_checkinteger (lua_State *L, int narg) {
- lua_Integer d = lua_tointeger(L, narg);
- if (d == 0 && !lua_isnumber(L, narg)) /* avoid extra test when d is not 0 */
- tag_error(L, narg, LUA_TNUMBER);
- return d;
-}
-
-
-LUALIB_API lua_Integer luaL_optinteger (lua_State *L, int narg,
- lua_Integer def) {
- return luaL_opt(L, luaL_checkinteger, narg, def);
-}
-
-
-LUALIB_API int luaL_getmetafield (lua_State *L, int obj, const char *event) {
- if (!lua_getmetatable(L, obj)) /* no metatable? */
- return 0;
- lua_pushstring(L, event);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 2); /* remove metatable and metafield */
- return 0;
- }
- else {
- lua_remove(L, -2); /* remove only metatable */
- return 1;
- }
-}
-
-
-LUALIB_API int luaL_callmeta (lua_State *L, int obj, const char *event) {
- obj = abs_index(L, obj);
- if (!luaL_getmetafield(L, obj, event)) /* no metafield? */
- return 0;
- lua_pushvalue(L, obj);
- lua_call(L, 1, 1);
- return 1;
-}
-
-
-LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
- const luaL_Reg *l) {
- luaI_openlib(L, libname, l, 0);
-}
-
-
-static int libsize (const luaL_Reg *l) {
- int size = 0;
- for (; l->name; l++) size++;
- return size;
-}
-
-
-LUALIB_API void luaI_openlib (lua_State *L, const char *libname,
- const luaL_Reg *l, int nup) {
- if (libname) {
- int size = libsize(l);
- /* check whether lib already exists */
- luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 1);
- lua_getfield(L, -1, libname); /* get _LOADED[libname] */
- if (!lua_istable(L, -1)) { /* not found? */
- lua_pop(L, 1); /* remove previous result */
- /* try global variable (and create one if it does not exist) */
- if (luaL_findtable(L, LUA_GLOBALSINDEX, libname, size) != NULL)
- luaL_error(L, "name conflict for module " LUA_QS, libname);
- lua_pushvalue(L, -1);
- lua_setfield(L, -3, libname); /* _LOADED[libname] = new table */
- }
- lua_remove(L, -2); /* remove _LOADED table */
- lua_insert(L, -(nup+1)); /* move library table to below upvalues */
- }
- for (; l->name; l++) {
- int i;
- for (i=0; i<nup; i++) /* copy upvalues to the top */
- lua_pushvalue(L, -nup);
- lua_pushcclosure(L, l->func, nup);
- lua_setfield(L, -(nup+2), l->name);
- }
- lua_pop(L, nup); /* remove upvalues */
-}
-
-
-
-/*
-** {======================================================
-** getn-setn: size for arrays
-** =======================================================
-*/
-
-#if defined(LUA_COMPAT_GETN)
-
-static int checkint (lua_State *L, int topop) {
- int n = (lua_type(L, -1) == LUA_TNUMBER) ? lua_tointeger(L, -1) : -1;
- lua_pop(L, topop);
- return n;
-}
-
-
-static void getsizes (lua_State *L) {
- lua_getfield(L, LUA_REGISTRYINDEX, "LUA_SIZES");
- if (lua_isnil(L, -1)) { /* no `size' table? */
- lua_pop(L, 1); /* remove nil */
- lua_newtable(L); /* create it */
- lua_pushvalue(L, -1); /* `size' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "kv");
- lua_setfield(L, -2, "__mode"); /* metatable(N).__mode = "kv" */
- lua_pushvalue(L, -1);
- lua_setfield(L, LUA_REGISTRYINDEX, "LUA_SIZES"); /* store in register */
- }
-}
-
-
-LUALIB_API void luaL_setn (lua_State *L, int t, int n) {
- t = abs_index(L, t);
- lua_pushliteral(L, "n");
- lua_rawget(L, t);
- if (checkint(L, 1) >= 0) { /* is there a numeric field `n'? */
- lua_pushliteral(L, "n"); /* use it */
- lua_pushinteger(L, n);
- lua_rawset(L, t);
- }
- else { /* use `sizes' */
- getsizes(L);
- lua_pushvalue(L, t);
- lua_pushinteger(L, n);
- lua_rawset(L, -3); /* sizes[t] = n */
- lua_pop(L, 1); /* remove `sizes' */
- }
-}
-
-
-LUALIB_API int luaL_getn (lua_State *L, int t) {
- int n;
- t = abs_index(L, t);
- lua_pushliteral(L, "n"); /* try t.n */
- lua_rawget(L, t);
- if ((n = checkint(L, 1)) >= 0) return n;
- getsizes(L); /* else try sizes[t] */
- lua_pushvalue(L, t);
- lua_rawget(L, -2);
- if ((n = checkint(L, 2)) >= 0) return n;
- return (int)lua_objlen(L, t);
-}
-
-#endif
-
-/* }====================================================== */
-
-
-
-LUALIB_API const char *luaL_gsub (lua_State *L, const char *s, const char *p,
- const char *r) {
- const char *wild;
- size_t l = strlen(p);
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- while ((wild = strstr(s, p)) != NULL) {
- luaL_addlstring(&b, s, wild - s); /* push prefix */
- luaL_addstring(&b, r); /* push replacement in place of pattern */
- s = wild + l; /* continue after `p' */
- }
- luaL_addstring(&b, s); /* push last suffix */
- luaL_pushresult(&b);
- return lua_tostring(L, -1);
-}
-
-
-LUALIB_API const char *luaL_findtable (lua_State *L, int idx,
- const char *fname, int szhint) {
- const char *e;
- lua_pushvalue(L, idx);
- do {
- e = strchr(fname, '.');
- if (e == NULL) e = fname + strlen(fname);
- lua_pushlstring(L, fname, e - fname);
- lua_rawget(L, -2);
- if (lua_isnil(L, -1)) { /* no such field? */
- lua_pop(L, 1); /* remove this nil */
- lua_createtable(L, 0, (*e == '.' ? 1 : szhint)); /* new table for field */
- lua_pushlstring(L, fname, e - fname);
- lua_pushvalue(L, -2);
- lua_settable(L, -4); /* set new table into field */
- }
- else if (!lua_istable(L, -1)) { /* field has a non-table value? */
- lua_pop(L, 2); /* remove table and value */
- return fname; /* return problematic part of the name */
- }
- lua_remove(L, -2); /* remove previous table */
- fname = e + 1;
- } while (*e == '.');
- return NULL;
-}
-
-
-
-/*
-** {======================================================
-** Generic Buffer manipulation
-** =======================================================
-*/
-
-
-#define bufflen(B) ((B)->p - (B)->buffer)
-#define bufffree(B) ((size_t)(LUAL_BUFFERSIZE - bufflen(B)))
-
-#define LIMIT (LUA_MINSTACK/2)
-
-
-static int emptybuffer (luaL_Buffer *B) {
- size_t l = bufflen(B);
- if (l == 0) return 0; /* put nothing on stack */
- else {
- lua_pushlstring(B->L, B->buffer, l);
- B->p = B->buffer;
- B->lvl++;
- return 1;
- }
-}
-
-
-static void adjuststack (luaL_Buffer *B) {
- if (B->lvl > 1) {
- lua_State *L = B->L;
- int toget = 1; /* number of levels to concat */
- size_t toplen = lua_strlen(L, -1);
- do {
- size_t l = lua_strlen(L, -(toget+1));
- if (B->lvl - toget + 1 >= LIMIT || toplen > l) {
- toplen += l;
- toget++;
- }
- else break;
- } while (toget < B->lvl);
- lua_concat(L, toget);
- B->lvl = B->lvl - toget + 1;
- }
-}
-
-
-LUALIB_API char *luaL_prepbuffer (luaL_Buffer *B) {
- if (emptybuffer(B))
- adjuststack(B);
- return B->buffer;
-}
-
-
-LUALIB_API void luaL_addlstring (luaL_Buffer *B, const char *s, size_t l) {
- while (l--)
- luaL_addchar(B, *s++);
-}
-
-
-LUALIB_API void luaL_addstring (luaL_Buffer *B, const char *s) {
- luaL_addlstring(B, s, strlen(s));
-}
-
-
-LUALIB_API void luaL_pushresult (luaL_Buffer *B) {
- emptybuffer(B);
- lua_concat(B->L, B->lvl);
- B->lvl = 1;
-}
-
-
-LUALIB_API void luaL_addvalue (luaL_Buffer *B) {
- lua_State *L = B->L;
- size_t vl;
- const char *s = lua_tolstring(L, -1, &vl);
- if (vl <= bufffree(B)) { /* fit into buffer? */
- memcpy(B->p, s, vl); /* put it there */
- B->p += vl;
- lua_pop(L, 1); /* remove from stack */
- }
- else {
- if (emptybuffer(B))
- lua_insert(L, -2); /* put buffer before new value */
- B->lvl++; /* add new value into B stack */
- adjuststack(B);
- }
-}
-
-
-LUALIB_API void luaL_buffinit (lua_State *L, luaL_Buffer *B) {
- B->L = L;
- B->p = B->buffer;
- B->lvl = 0;
-}
-
-/* }====================================================== */
-
-
-LUALIB_API int luaL_ref (lua_State *L, int t) {
- int ref;
- t = abs_index(L, t);
- if (lua_isnil(L, -1)) {
- lua_pop(L, 1); /* remove from stack */
- return LUA_REFNIL; /* `nil' has a unique fixed reference */
- }
- lua_rawgeti(L, t, FREELIST_REF); /* get first free element */
- ref = (int)lua_tointeger(L, -1); /* ref = t[FREELIST_REF] */
- lua_pop(L, 1); /* remove it from stack */
- if (ref != 0) { /* any free element? */
- lua_rawgeti(L, t, ref); /* remove it from list */
- lua_rawseti(L, t, FREELIST_REF); /* (t[FREELIST_REF] = t[ref]) */
- }
- else { /* no free elements */
- ref = (int)lua_objlen(L, t);
- ref++; /* create new reference */
- }
- lua_rawseti(L, t, ref);
- return ref;
-}
-
-
-LUALIB_API void luaL_unref (lua_State *L, int t, int ref) {
- if (ref >= 0) {
- t = abs_index(L, t);
- lua_rawgeti(L, t, FREELIST_REF);
- lua_rawseti(L, t, ref); /* t[ref] = t[FREELIST_REF] */
- lua_pushinteger(L, ref);
- lua_rawseti(L, t, FREELIST_REF); /* t[FREELIST_REF] = ref */
- }
-}
-
-
-
-/*
-** {======================================================
-** Load functions
-** =======================================================
-*/
-
-typedef struct LoadF {
- int extraline;
- FILE *f;
- char buff[LUAL_BUFFERSIZE];
-} LoadF;
-
-
-static const char *getF (lua_State *L, void *ud, size_t *size) {
- LoadF *lf = (LoadF *)ud;
- (void)L;
- if (lf->extraline) {
- lf->extraline = 0;
- *size = 1;
- return "\n";
- }
- if (feof(lf->f)) return NULL;
- *size = fread(lf->buff, 1, sizeof(lf->buff), lf->f);
- return (*size > 0) ? lf->buff : NULL;
-}
-
-
-static int errfile (lua_State *L, const char *what, int fnameindex) {
- const char *serr = strerror(errno);
- const char *filename = lua_tostring(L, fnameindex) + 1;
- lua_pushfstring(L, "cannot %s %s: %s", what, filename, serr);
- lua_remove(L, fnameindex);
- return LUA_ERRFILE;
-}
-
-
-LUALIB_API int luaL_loadfile (lua_State *L, const char *filename) {
- LoadF lf;
- int status, readstatus;
- int c;
- int fnameindex = lua_gettop(L) + 1; /* index of filename on the stack */
- lf.extraline = 0;
- if (filename == NULL) {
- lua_pushliteral(L, "=stdin");
- lf.f = stdin;
- }
- else {
- lua_pushfstring(L, "@%s", filename);
- lf.f = fopen(filename, "r");
- if (lf.f == NULL) return errfile(L, "open", fnameindex);
- }
- c = getc(lf.f);
- if (c == '#') { /* Unix exec. file? */
- lf.extraline = 1;
- while ((c = getc(lf.f)) != EOF && c != '\n') ; /* skip first line */
- if (c == '\n') c = getc(lf.f);
- }
- if (c == LUA_SIGNATURE[0] && filename) { /* binary file? */
- lf.f = freopen(filename, "rb", lf.f); /* reopen in binary mode */
- if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
- /* skip eventual `#!...' */
- while ((c = getc(lf.f)) != EOF && c != LUA_SIGNATURE[0]) ;
- lf.extraline = 0;
- }
- ungetc(c, lf.f);
- status = lua_load(L, getF, &lf, lua_tostring(L, -1));
- readstatus = ferror(lf.f);
- if (filename) fclose(lf.f); /* close file (even in case of errors) */
- if (readstatus) {
- lua_settop(L, fnameindex); /* ignore results from `lua_load' */
- return errfile(L, "read", fnameindex);
- }
- lua_remove(L, fnameindex);
- return status;
-}
-
-
-typedef struct LoadS {
- const char *s;
- size_t size;
-} LoadS;
-
-
-static const char *getS (lua_State *L, void *ud, size_t *size) {
- LoadS *ls = (LoadS *)ud;
- (void)L;
- if (ls->size == 0) return NULL;
- *size = ls->size;
- ls->size = 0;
- return ls->s;
-}
-
-
-LUALIB_API int luaL_loadbuffer (lua_State *L, const char *buff, size_t size,
- const char *name) {
- LoadS ls;
- ls.s = buff;
- ls.size = size;
- return lua_load(L, getS, &ls, name);
-}
-
-
-LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s) {
- return luaL_loadbuffer(L, s, strlen(s), s);
-}
-
-
-
-/* }====================================================== */
-
-
-static void *l_alloc (void *ud, void *ptr, size_t osize, size_t nsize) {
- (void)ud;
- (void)osize;
- if (nsize == 0) {
- free(ptr);
- return NULL;
- }
- else
- return realloc(ptr, nsize);
-}
-
-
-static int panic (lua_State *L) {
- (void)L; /* to avoid warnings */
- fprintf(stderr, "PANIC: unprotected error in call to Lua API (%s)\n",
- lua_tostring(L, -1));
- return 0;
-}
-
-
-LUALIB_API lua_State *luaL_newstate (void) {
- lua_State *L = lua_newstate(l_alloc, NULL);
- if (L) lua_atpanic(L, &panic);
- return L;
-}
+++ /dev/null
-/*
-** $Id: lauxlib.h,v 1.88.1.1 2007/12/27 13:02:25 roberto Exp $
-** Auxiliary functions for building Lua libraries
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lauxlib_h
-#define lauxlib_h
-
-
-#include <stddef.h>
-#include <stdio.h>
-
-#include "lua.h"
-
-
-#if defined(LUA_COMPAT_GETN)
-LUALIB_API int (luaL_getn) (lua_State *L, int t);
-LUALIB_API void (luaL_setn) (lua_State *L, int t, int n);
-#else
-#define luaL_getn(L,i) ((int)lua_objlen(L, i))
-#define luaL_setn(L,i,j) ((void)0) /* no op! */
-#endif
-
-#if defined(LUA_COMPAT_OPENLIB)
-#define luaI_openlib luaL_openlib
-#endif
-
-
-/* extra error code for `luaL_load' */
-#define LUA_ERRFILE (LUA_ERRERR+1)
-
-
-typedef struct luaL_Reg {
- const char *name;
- lua_CFunction func;
-} luaL_Reg;
-
-
-
-LUALIB_API void (luaI_openlib) (lua_State *L, const char *libname,
- const luaL_Reg *l, int nup);
-LUALIB_API void (luaL_register) (lua_State *L, const char *libname,
- const luaL_Reg *l);
-LUALIB_API int (luaL_getmetafield) (lua_State *L, int obj, const char *e);
-LUALIB_API int (luaL_callmeta) (lua_State *L, int obj, const char *e);
-LUALIB_API int (luaL_typerror) (lua_State *L, int narg, const char *tname);
-LUALIB_API int (luaL_argerror) (lua_State *L, int numarg, const char *extramsg);
-LUALIB_API const char *(luaL_checklstring) (lua_State *L, int numArg,
- size_t *l);
-LUALIB_API const char *(luaL_optlstring) (lua_State *L, int numArg,
- const char *def, size_t *l);
-LUALIB_API lua_Number (luaL_checknumber) (lua_State *L, int numArg);
-LUALIB_API lua_Number (luaL_optnumber) (lua_State *L, int nArg, lua_Number def);
-
-LUALIB_API lua_Integer (luaL_checkinteger) (lua_State *L, int numArg);
-LUALIB_API lua_Integer (luaL_optinteger) (lua_State *L, int nArg,
- lua_Integer def);
-
-LUALIB_API void (luaL_checkstack) (lua_State *L, int sz, const char *msg);
-LUALIB_API void (luaL_checktype) (lua_State *L, int narg, int t);
-LUALIB_API void (luaL_checkany) (lua_State *L, int narg);
-
-LUALIB_API int (luaL_newmetatable) (lua_State *L, const char *tname);
-LUALIB_API void *(luaL_checkudata) (lua_State *L, int ud, const char *tname);
-
-LUALIB_API void (luaL_where) (lua_State *L, int lvl);
-LUALIB_API int (luaL_error) (lua_State *L, const char *fmt, ...);
-
-LUALIB_API int (luaL_checkoption) (lua_State *L, int narg, const char *def,
- const char *const lst[]);
-
-LUALIB_API int (luaL_ref) (lua_State *L, int t);
-LUALIB_API void (luaL_unref) (lua_State *L, int t, int ref);
-
-LUALIB_API int (luaL_loadfile) (lua_State *L, const char *filename);
-LUALIB_API int (luaL_loadbuffer) (lua_State *L, const char *buff, size_t sz,
- const char *name);
-LUALIB_API int (luaL_loadstring) (lua_State *L, const char *s);
-
-LUALIB_API lua_State *(luaL_newstate) (void);
-
-
-LUALIB_API const char *(luaL_gsub) (lua_State *L, const char *s, const char *p,
- const char *r);
-
-LUALIB_API const char *(luaL_findtable) (lua_State *L, int idx,
- const char *fname, int szhint);
-
-
-
-
-/*
-** ===============================================================
-** some useful macros
-** ===============================================================
-*/
-
-#define luaL_argcheck(L, cond,numarg,extramsg) \
- ((void)((cond) || luaL_argerror(L, (numarg), (extramsg))))
-#define luaL_checkstring(L,n) (luaL_checklstring(L, (n), NULL))
-#define luaL_optstring(L,n,d) (luaL_optlstring(L, (n), (d), NULL))
-#define luaL_checkint(L,n) ((int)luaL_checkinteger(L, (n)))
-#define luaL_optint(L,n,d) ((int)luaL_optinteger(L, (n), (d)))
-#define luaL_checklong(L,n) ((long)luaL_checkinteger(L, (n)))
-#define luaL_optlong(L,n,d) ((long)luaL_optinteger(L, (n), (d)))
-
-#define luaL_typename(L,i) lua_typename(L, lua_type(L,(i)))
-
-#define luaL_dofile(L, fn) \
- (luaL_loadfile(L, fn) || lua_pcall(L, 0, LUA_MULTRET, 0))
-
-#define luaL_dostring(L, s) \
- (luaL_loadstring(L, s) || lua_pcall(L, 0, LUA_MULTRET, 0))
-
-#define luaL_getmetatable(L,n) (lua_getfield(L, LUA_REGISTRYINDEX, (n)))
-
-#define luaL_opt(L,f,n,d) (lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))
-
-/*
-** {======================================================
-** Generic Buffer manipulation
-** =======================================================
-*/
-
-
-
-typedef struct luaL_Buffer {
- char *p; /* current position in buffer */
- int lvl; /* number of strings in the stack (level) */
- lua_State *L;
- char buffer[LUAL_BUFFERSIZE];
-} luaL_Buffer;
-
-#define luaL_addchar(B,c) \
- ((void)((B)->p < ((B)->buffer+LUAL_BUFFERSIZE) || luaL_prepbuffer(B)), \
- (*(B)->p++ = (char)(c)))
-
-/* compatibility only */
-#define luaL_putchar(B,c) luaL_addchar(B,c)
-
-#define luaL_addsize(B,n) ((B)->p += (n))
-
-LUALIB_API void (luaL_buffinit) (lua_State *L, luaL_Buffer *B);
-LUALIB_API char *(luaL_prepbuffer) (luaL_Buffer *B);
-LUALIB_API void (luaL_addlstring) (luaL_Buffer *B, const char *s, size_t l);
-LUALIB_API void (luaL_addstring) (luaL_Buffer *B, const char *s);
-LUALIB_API void (luaL_addvalue) (luaL_Buffer *B);
-LUALIB_API void (luaL_pushresult) (luaL_Buffer *B);
-
-
-/* }====================================================== */
-
-
-/* compatibility with ref system */
-
-/* pre-defined references */
-#define LUA_NOREF (-2)
-#define LUA_REFNIL (-1)
-
-#define lua_ref(L,lock) ((lock) ? luaL_ref(L, LUA_REGISTRYINDEX) : \
- (lua_pushstring(L, "unlocked references are obsolete"), lua_error(L), 0))
-
-#define lua_unref(L,ref) luaL_unref(L, LUA_REGISTRYINDEX, (ref))
-
-#define lua_getref(L,ref) lua_rawgeti(L, LUA_REGISTRYINDEX, (ref))
-
-
-#define luaL_reg luaL_Reg
-
-#endif
+++ /dev/null
-/*
-** $Id: lbaselib.c,v 1.191.1.6 2008/02/14 16:46:22 roberto Exp $
-** Basic library
-** See Copyright Notice in lua.h
-*/
-
-
-
-#include <ctype.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lbaselib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-
-/*
-** If your system does not support `stdout', you can just remove this function.
-** If you need, you can define your own `print' function, following this
-** model but changing `fputs' to put the strings at a proper place
-** (a console window or a log file, for instance).
-*/
-static int luaB_print (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- int i;
- lua_getglobal(L, "tostring");
- for (i=1; i<=n; i++) {
- const char *s;
- lua_pushvalue(L, -1); /* function to be called */
- lua_pushvalue(L, i); /* value to print */
- lua_call(L, 1, 1);
- s = lua_tostring(L, -1); /* get result */
- if (s == NULL)
- return luaL_error(L, LUA_QL("tostring") " must return a string to "
- LUA_QL("print"));
- if (i>1) fputs("\t", stdout);
- fputs(s, stdout);
- lua_pop(L, 1); /* pop result */
- }
- fputs("\n", stdout);
- return 0;
-}
-
-
-static int luaB_tonumber (lua_State *L) {
- int base = luaL_optint(L, 2, 10);
- if (base == 10) { /* standard conversion */
- luaL_checkany(L, 1);
- if (lua_isnumber(L, 1)) {
- lua_pushnumber(L, lua_tonumber(L, 1));
- return 1;
- }
- }
- else {
- const char *s1 = luaL_checkstring(L, 1);
- char *s2;
- unsigned long n;
- luaL_argcheck(L, 2 <= base && base <= 36, 2, "base out of range");
- n = strtoul(s1, &s2, base);
- if (s1 != s2) { /* at least one valid digit? */
- while (isspace((unsigned char)(*s2))) s2++; /* skip trailing spaces */
- if (*s2 == '\0') { /* no invalid trailing characters? */
- lua_pushnumber(L, (lua_Number)n);
- return 1;
- }
- }
- }
- lua_pushnil(L); /* else not a number */
- return 1;
-}
-
-
-static int luaB_error (lua_State *L) {
- int level = luaL_optint(L, 2, 1);
- lua_settop(L, 1);
- if (lua_isstring(L, 1) && level > 0) { /* add extra information? */
- luaL_where(L, level);
- lua_pushvalue(L, 1);
- lua_concat(L, 2);
- }
- return lua_error(L);
-}
-
-
-static int luaB_getmetatable (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_getmetatable(L, 1)) {
- lua_pushnil(L);
- return 1; /* no metatable */
- }
- luaL_getmetafield(L, 1, "__metatable");
- return 1; /* returns either __metatable field (if present) or metatable */
-}
-
-
-static int luaB_setmetatable (lua_State *L) {
- int t = lua_type(L, 2);
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
- "nil or table expected");
- if (luaL_getmetafield(L, 1, "__metatable"))
- luaL_error(L, "cannot change a protected metatable");
- lua_settop(L, 2);
- lua_setmetatable(L, 1);
- return 1;
-}
-
-
-static void getfunc (lua_State *L, int opt) {
- if (lua_isfunction(L, 1)) lua_pushvalue(L, 1);
- else {
- lua_Debug ar;
- int level = opt ? luaL_optint(L, 1, 1) : luaL_checkint(L, 1);
- luaL_argcheck(L, level >= 0, 1, "level must be non-negative");
- if (lua_getstack(L, level, &ar) == 0)
- luaL_argerror(L, 1, "invalid level");
- lua_getinfo(L, "f", &ar);
- if (lua_isnil(L, -1))
- luaL_error(L, "no function environment for tail call at level %d",
- level);
- }
-}
-
-
-static int luaB_getfenv (lua_State *L) {
- getfunc(L, 1);
- if (lua_iscfunction(L, -1)) /* is a C function? */
- lua_pushvalue(L, LUA_GLOBALSINDEX); /* return the thread's global env. */
- else
- lua_getfenv(L, -1);
- return 1;
-}
-
-
-static int luaB_setfenv (lua_State *L) {
- luaL_checktype(L, 2, LUA_TTABLE);
- getfunc(L, 0);
- lua_pushvalue(L, 2);
- if (lua_isnumber(L, 1) && lua_tonumber(L, 1) == 0) {
- /* change environment of current thread */
- lua_pushthread(L);
- lua_insert(L, -2);
- lua_setfenv(L, -2);
- return 0;
- }
- else if (lua_iscfunction(L, -2) || lua_setfenv(L, -2) == 0)
- luaL_error(L,
- LUA_QL("setfenv") " cannot change environment of given object");
- return 1;
-}
-
-
-static int luaB_rawequal (lua_State *L) {
- luaL_checkany(L, 1);
- luaL_checkany(L, 2);
- lua_pushboolean(L, lua_rawequal(L, 1, 2));
- return 1;
-}
-
-
-static int luaB_rawget (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checkany(L, 2);
- lua_settop(L, 2);
- lua_rawget(L, 1);
- return 1;
-}
-
-static int luaB_rawset (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checkany(L, 2);
- luaL_checkany(L, 3);
- lua_settop(L, 3);
- lua_rawset(L, 1);
- return 1;
-}
-
-
-static int luaB_gcinfo (lua_State *L) {
- lua_pushinteger(L, lua_getgccount(L));
- return 1;
-}
-
-
-static int luaB_collectgarbage (lua_State *L) {
- static const char *const opts[] = {"stop", "restart", "collect",
- "count", "step", "setpause", "setstepmul", NULL};
- static const int optsnum[] = {LUA_GCSTOP, LUA_GCRESTART, LUA_GCCOLLECT,
- LUA_GCCOUNT, LUA_GCSTEP, LUA_GCSETPAUSE, LUA_GCSETSTEPMUL};
- int o = luaL_checkoption(L, 1, "collect", opts);
- int ex = luaL_optint(L, 2, 0);
- int res = lua_gc(L, optsnum[o], ex);
- switch (optsnum[o]) {
- case LUA_GCCOUNT: {
- int b = lua_gc(L, LUA_GCCOUNTB, 0);
- lua_pushnumber(L, res + ((lua_Number)b/1024));
- return 1;
- }
- case LUA_GCSTEP: {
- lua_pushboolean(L, res);
- return 1;
- }
- default: {
- lua_pushnumber(L, res);
- return 1;
- }
- }
-}
-
-
-static int luaB_type (lua_State *L) {
- luaL_checkany(L, 1);
- lua_pushstring(L, luaL_typename(L, 1));
- return 1;
-}
-
-
-static int luaB_next (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_settop(L, 2); /* create a 2nd argument if there isn't one */
- if (lua_next(L, 1))
- return 2;
- else {
- lua_pushnil(L);
- return 1;
- }
-}
-
-
-static int luaB_pairs (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushnil(L); /* and initial value */
- return 3;
-}
-
-
-static int ipairsaux (lua_State *L) {
- int i = luaL_checkint(L, 2);
- luaL_checktype(L, 1, LUA_TTABLE);
- i++; /* next value */
- lua_pushinteger(L, i);
- lua_rawgeti(L, 1, i);
- return (lua_isnil(L, -1)) ? 0 : 2;
-}
-
-
-static int luaB_ipairs (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_pushvalue(L, lua_upvalueindex(1)); /* return generator, */
- lua_pushvalue(L, 1); /* state, */
- lua_pushinteger(L, 0); /* and initial value */
- return 3;
-}
-
-
-static int load_aux (lua_State *L, int status) {
- if (status == 0) /* OK? */
- return 1;
- else {
- lua_pushnil(L);
- lua_insert(L, -2); /* put before error message */
- return 2; /* return nil plus error message */
- }
-}
-
-
-static int luaB_loadstring (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- const char *chunkname = luaL_optstring(L, 2, s);
- return load_aux(L, luaL_loadbuffer(L, s, l, chunkname));
-}
-
-
-static int luaB_loadfile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- return load_aux(L, luaL_loadfile(L, fname));
-}
-
-
-/*
-** Reader for generic `load' function: `lua_load' uses the
-** stack for internal stuff, so the reader cannot change the
-** stack top. Instead, it keeps its resulting string in a
-** reserved slot inside the stack.
-*/
-static const char *generic_reader (lua_State *L, void *ud, size_t *size) {
- (void)ud; /* to avoid warnings */
- luaL_checkstack(L, 2, "too many nested functions");
- lua_pushvalue(L, 1); /* get function */
- lua_call(L, 0, 1); /* call it */
- if (lua_isnil(L, -1)) {
- *size = 0;
- return NULL;
- }
- else if (lua_isstring(L, -1)) {
- lua_replace(L, 3); /* save string in a reserved stack slot */
- return lua_tolstring(L, 3, size);
- }
- else luaL_error(L, "reader function must return a string");
- return NULL; /* to avoid warnings */
-}
-
-
-static int luaB_load (lua_State *L) {
- int status;
- const char *cname = luaL_optstring(L, 2, "=(load)");
- luaL_checktype(L, 1, LUA_TFUNCTION);
- lua_settop(L, 3); /* function, eventual name, plus one reserved slot */
- status = lua_load(L, generic_reader, NULL, cname);
- return load_aux(L, status);
-}
-
-
-static int luaB_dofile (lua_State *L) {
- const char *fname = luaL_optstring(L, 1, NULL);
- int n = lua_gettop(L);
- if (luaL_loadfile(L, fname) != 0) lua_error(L);
- lua_call(L, 0, LUA_MULTRET);
- return lua_gettop(L) - n;
-}
-
-
-static int luaB_assert (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_toboolean(L, 1))
- return luaL_error(L, "%s", luaL_optstring(L, 2, "assertion failed!"));
- return lua_gettop(L);
-}
-
-
-static int luaB_unpack (lua_State *L) {
- int i, e, n;
- luaL_checktype(L, 1, LUA_TTABLE);
- i = luaL_optint(L, 2, 1);
- e = luaL_opt(L, luaL_checkint, 3, luaL_getn(L, 1));
- if (i > e) return 0; /* empty range */
- n = e - i + 1; /* number of elements */
- if (n <= 0 || !lua_checkstack(L, n)) /* n <= 0 means arith. overflow */
- return luaL_error(L, "too many results to unpack");
- lua_rawgeti(L, 1, i); /* push arg[i] (avoiding overflow problems) */
- while (i++ < e) /* push arg[i + 1...e] */
- lua_rawgeti(L, 1, i);
- return n;
-}
-
-
-static int luaB_select (lua_State *L) {
- int n = lua_gettop(L);
- if (lua_type(L, 1) == LUA_TSTRING && *lua_tostring(L, 1) == '#') {
- lua_pushinteger(L, n-1);
- return 1;
- }
- else {
- int i = luaL_checkint(L, 1);
- if (i < 0) i = n + i;
- else if (i > n) i = n;
- luaL_argcheck(L, 1 <= i, 1, "index out of range");
- return n - i;
- }
-}
-
-
-static int luaB_pcall (lua_State *L) {
- int status;
- luaL_checkany(L, 1);
- status = lua_pcall(L, lua_gettop(L) - 1, LUA_MULTRET, 0);
- lua_pushboolean(L, (status == 0));
- lua_insert(L, 1);
- return lua_gettop(L); /* return status + all results */
-}
-
-
-static int luaB_xpcall (lua_State *L) {
- int status;
- luaL_checkany(L, 2);
- lua_settop(L, 2);
- lua_insert(L, 1); /* put error function under function to be called */
- status = lua_pcall(L, 0, LUA_MULTRET, 1);
- lua_pushboolean(L, (status == 0));
- lua_replace(L, 1);
- return lua_gettop(L); /* return status + all results */
-}
-
-
-static int luaB_tostring (lua_State *L) {
- luaL_checkany(L, 1);
- if (luaL_callmeta(L, 1, "__tostring")) /* is there a metafield? */
- return 1; /* use its value */
- switch (lua_type(L, 1)) {
- case LUA_TNUMBER:
- lua_pushstring(L, lua_tostring(L, 1));
- break;
- case LUA_TSTRING:
- lua_pushvalue(L, 1);
- break;
- case LUA_TBOOLEAN:
- lua_pushstring(L, (lua_toboolean(L, 1) ? "true" : "false"));
- break;
- case LUA_TNIL:
- lua_pushliteral(L, "nil");
- break;
- default:
- lua_pushfstring(L, "%s: %p", luaL_typename(L, 1), lua_topointer(L, 1));
- break;
- }
- return 1;
-}
-
-
-static int luaB_newproxy (lua_State *L) {
- lua_settop(L, 1);
- lua_newuserdata(L, 0); /* create proxy */
- if (lua_toboolean(L, 1) == 0)
- return 1; /* no metatable */
- else if (lua_isboolean(L, 1)) {
- lua_newtable(L); /* create a new metatable `m' ... */
- lua_pushvalue(L, -1); /* ... and mark `m' as a valid metatable */
- lua_pushboolean(L, 1);
- lua_rawset(L, lua_upvalueindex(1)); /* weaktable[m] = true */
- }
- else {
- int validproxy = 0; /* to check if weaktable[metatable(u)] == true */
- if (lua_getmetatable(L, 1)) {
- lua_rawget(L, lua_upvalueindex(1));
- validproxy = lua_toboolean(L, -1);
- lua_pop(L, 1); /* remove value */
- }
- luaL_argcheck(L, validproxy, 1, "boolean or proxy expected");
- lua_getmetatable(L, 1); /* metatable is valid; get it */
- }
- lua_setmetatable(L, 2);
- return 1;
-}
-
-
-static const luaL_Reg base_funcs[] = {
- {"assert", luaB_assert},
- {"collectgarbage", luaB_collectgarbage},
- {"dofile", luaB_dofile},
- {"error", luaB_error},
- {"gcinfo", luaB_gcinfo},
- {"getfenv", luaB_getfenv},
- {"getmetatable", luaB_getmetatable},
- {"loadfile", luaB_loadfile},
- {"load", luaB_load},
- {"loadstring", luaB_loadstring},
- {"next", luaB_next},
- {"pcall", luaB_pcall},
- {"print", luaB_print},
- {"rawequal", luaB_rawequal},
- {"rawget", luaB_rawget},
- {"rawset", luaB_rawset},
- {"select", luaB_select},
- {"setfenv", luaB_setfenv},
- {"setmetatable", luaB_setmetatable},
- {"tonumber", luaB_tonumber},
- {"tostring", luaB_tostring},
- {"type", luaB_type},
- {"unpack", luaB_unpack},
- {"xpcall", luaB_xpcall},
- {NULL, NULL}
-};
-
-
-/*
-** {======================================================
-** Coroutine library
-** =======================================================
-*/
-
-#define CO_RUN 0 /* running */
-#define CO_SUS 1 /* suspended */
-#define CO_NOR 2 /* 'normal' (it resumed another coroutine) */
-#define CO_DEAD 3
-
-static const char *const statnames[] =
- {"running", "suspended", "normal", "dead"};
-
-static int costatus (lua_State *L, lua_State *co) {
- if (L == co) return CO_RUN;
- switch (lua_status(co)) {
- case LUA_YIELD:
- return CO_SUS;
- case 0: {
- lua_Debug ar;
- if (lua_getstack(co, 0, &ar) > 0) /* does it have frames? */
- return CO_NOR; /* it is running */
- else if (lua_gettop(co) == 0)
- return CO_DEAD;
- else
- return CO_SUS; /* initial state */
- }
- default: /* some error occured */
- return CO_DEAD;
- }
-}
-
-
-static int luaB_costatus (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- luaL_argcheck(L, co, 1, "coroutine expected");
- lua_pushstring(L, statnames[costatus(L, co)]);
- return 1;
-}
-
-
-static int auxresume (lua_State *L, lua_State *co, int narg) {
- int status = costatus(L, co);
- if (!lua_checkstack(co, narg))
- luaL_error(L, "too many arguments to resume");
- if (status != CO_SUS) {
- lua_pushfstring(L, "cannot resume %s coroutine", statnames[status]);
- return -1; /* error flag */
- }
- lua_xmove(L, co, narg);
- lua_setlevel(L, co);
- status = lua_resume(co, narg);
- if (status == 0 || status == LUA_YIELD) {
- int nres = lua_gettop(co);
- if (!lua_checkstack(L, nres + 1))
- luaL_error(L, "too many results to resume");
- lua_xmove(co, L, nres); /* move yielded values */
- return nres;
- }
- else {
- lua_xmove(co, L, 1); /* move error message */
- return -1; /* error flag */
- }
-}
-
-
-static int luaB_coresume (lua_State *L) {
- lua_State *co = lua_tothread(L, 1);
- int r;
- luaL_argcheck(L, co, 1, "coroutine expected");
- r = auxresume(L, co, lua_gettop(L) - 1);
- if (r < 0) {
- lua_pushboolean(L, 0);
- lua_insert(L, -2);
- return 2; /* return false + error message */
- }
- else {
- lua_pushboolean(L, 1);
- lua_insert(L, -(r + 1));
- return r + 1; /* return true + `resume' returns */
- }
-}
-
-
-static int luaB_auxwrap (lua_State *L) {
- lua_State *co = lua_tothread(L, lua_upvalueindex(1));
- int r = auxresume(L, co, lua_gettop(L));
- if (r < 0) {
- if (lua_isstring(L, -1)) { /* error object is a string? */
- luaL_where(L, 1); /* add extra info */
- lua_insert(L, -2);
- lua_concat(L, 2);
- }
- lua_error(L); /* propagate error */
- }
- return r;
-}
-
-
-static int luaB_cocreate (lua_State *L) {
- lua_State *NL = lua_newthread(L);
- luaL_argcheck(L, lua_isfunction(L, 1) && !lua_iscfunction(L, 1), 1,
- "Lua function expected");
- lua_pushvalue(L, 1); /* move function to top */
- lua_xmove(L, NL, 1); /* move function from L to NL */
- return 1;
-}
-
-
-static int luaB_cowrap (lua_State *L) {
- luaB_cocreate(L);
- lua_pushcclosure(L, luaB_auxwrap, 1);
- return 1;
-}
-
-
-static int luaB_yield (lua_State *L) {
- return lua_yield(L, lua_gettop(L));
-}
-
-
-static int luaB_corunning (lua_State *L) {
- if (lua_pushthread(L))
- lua_pushnil(L); /* main thread is not a coroutine */
- return 1;
-}
-
-
-static const luaL_Reg co_funcs[] = {
- {"create", luaB_cocreate},
- {"resume", luaB_coresume},
- {"running", luaB_corunning},
- {"status", luaB_costatus},
- {"wrap", luaB_cowrap},
- {"yield", luaB_yield},
- {NULL, NULL}
-};
-
-/* }====================================================== */
-
-
-static void auxopen (lua_State *L, const char *name,
- lua_CFunction f, lua_CFunction u) {
- lua_pushcfunction(L, u);
- lua_pushcclosure(L, f, 1);
- lua_setfield(L, -2, name);
-}
-
-
-static void base_open (lua_State *L) {
- /* set global _G */
- lua_pushvalue(L, LUA_GLOBALSINDEX);
- lua_setglobal(L, "_G");
- /* open lib into global table */
- luaL_register(L, "_G", base_funcs);
- lua_pushliteral(L, LUA_VERSION);
- lua_setglobal(L, "_VERSION"); /* set global _VERSION */
- /* `ipairs' and `pairs' need auxliliary functions as upvalues */
- auxopen(L, "ipairs", luaB_ipairs, ipairsaux);
- auxopen(L, "pairs", luaB_pairs, luaB_next);
- /* `newproxy' needs a weaktable as upvalue */
- lua_createtable(L, 0, 1); /* new table `w' */
- lua_pushvalue(L, -1); /* `w' will be its own metatable */
- lua_setmetatable(L, -2);
- lua_pushliteral(L, "kv");
- lua_setfield(L, -2, "__mode"); /* metatable(w).__mode = "kv" */
- lua_pushcclosure(L, luaB_newproxy, 1);
- lua_setglobal(L, "newproxy"); /* set global `newproxy' */
-}
-
-
-LUALIB_API int luaopen_base (lua_State *L) {
- base_open(L);
- luaL_register(L, LUA_COLIBNAME, co_funcs);
- return 2;
-}
+++ /dev/null
-/*
-** $Id: lcode.c,v 2.25.1.3 2007/12/28 15:32:23 roberto Exp $
-** Code generator for Lua
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-
-#define lcode_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lgc.h"
-#include "llex.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-#include "ltable.h"
-
-
-#define hasjumps(e) ((e)->t != (e)->f)
-
-
-static int isnumeral(expdesc *e) {
- return (e->k == VKNUM && e->t == NO_JUMP && e->f == NO_JUMP);
-}
-
-
-void luaK_nil (FuncState *fs, int from, int n) {
- Instruction *previous;
- if (fs->pc > fs->lasttarget) { /* no jumps to current position? */
- if (fs->pc == 0) { /* function start? */
- if (from >= fs->nactvar)
- return; /* positions are already clean */
- }
- else {
- previous = &fs->f->code[fs->pc-1];
- if (GET_OPCODE(*previous) == OP_LOADNIL) {
- int pfrom = GETARG_A(*previous);
- int pto = GETARG_B(*previous);
- if (pfrom <= from && from <= pto+1) { /* can connect both? */
- if (from+n-1 > pto)
- SETARG_B(*previous, from+n-1);
- return;
- }
- }
- }
- }
- luaK_codeABC(fs, OP_LOADNIL, from, from+n-1, 0); /* else no optimization */
-}
-
-
-int luaK_jump (FuncState *fs) {
- int jpc = fs->jpc; /* save list of jumps to here */
- int j;
- fs->jpc = NO_JUMP;
- j = luaK_codeAsBx(fs, OP_JMP, 0, NO_JUMP);
- luaK_concat(fs, &j, jpc); /* keep them on hold */
- return j;
-}
-
-
-void luaK_ret (FuncState *fs, int first, int nret) {
- luaK_codeABC(fs, OP_RETURN, first, nret+1, 0);
-}
-
-
-static int condjump (FuncState *fs, OpCode op, int A, int B, int C) {
- luaK_codeABC(fs, op, A, B, C);
- return luaK_jump(fs);
-}
-
-
-static void fixjump (FuncState *fs, int pc, int dest) {
- Instruction *jmp = &fs->f->code[pc];
- int offset = dest-(pc+1);
- lua_assert(dest != NO_JUMP);
- if (abs(offset) > MAXARG_sBx)
- luaX_syntaxerror(fs->ls, "control structure too long");
- SETARG_sBx(*jmp, offset);
-}
-
-
-/*
-** returns current `pc' and marks it as a jump target (to avoid wrong
-** optimizations with consecutive instructions not in the same basic block).
-*/
-int luaK_getlabel (FuncState *fs) {
- fs->lasttarget = fs->pc;
- return fs->pc;
-}
-
-
-static int getjump (FuncState *fs, int pc) {
- int offset = GETARG_sBx(fs->f->code[pc]);
- if (offset == NO_JUMP) /* point to itself represents end of list */
- return NO_JUMP; /* end of list */
- else
- return (pc+1)+offset; /* turn offset into absolute position */
-}
-
-
-static Instruction *getjumpcontrol (FuncState *fs, int pc) {
- Instruction *pi = &fs->f->code[pc];
- if (pc >= 1 && testTMode(GET_OPCODE(*(pi-1))))
- return pi-1;
- else
- return pi;
-}
-
-
-/*
-** check whether list has any jump that do not produce a value
-** (or produce an inverted value)
-*/
-static int need_value (FuncState *fs, int list) {
- for (; list != NO_JUMP; list = getjump(fs, list)) {
- Instruction i = *getjumpcontrol(fs, list);
- if (GET_OPCODE(i) != OP_TESTSET) return 1;
- }
- return 0; /* not found */
-}
-
-
-static int patchtestreg (FuncState *fs, int node, int reg) {
- Instruction *i = getjumpcontrol(fs, node);
- if (GET_OPCODE(*i) != OP_TESTSET)
- return 0; /* cannot patch other instructions */
- if (reg != NO_REG && reg != GETARG_B(*i))
- SETARG_A(*i, reg);
- else /* no register to put value or register already has the value */
- *i = CREATE_ABC(OP_TEST, GETARG_B(*i), 0, GETARG_C(*i));
-
- return 1;
-}
-
-
-static void removevalues (FuncState *fs, int list) {
- for (; list != NO_JUMP; list = getjump(fs, list))
- patchtestreg(fs, list, NO_REG);
-}
-
-
-static void patchlistaux (FuncState *fs, int list, int vtarget, int reg,
- int dtarget) {
- while (list != NO_JUMP) {
- int next = getjump(fs, list);
- if (patchtestreg(fs, list, reg))
- fixjump(fs, list, vtarget);
- else
- fixjump(fs, list, dtarget); /* jump to default target */
- list = next;
- }
-}
-
-
-static void dischargejpc (FuncState *fs) {
- patchlistaux(fs, fs->jpc, fs->pc, NO_REG, fs->pc);
- fs->jpc = NO_JUMP;
-}
-
-
-void luaK_patchlist (FuncState *fs, int list, int target) {
- if (target == fs->pc)
- luaK_patchtohere(fs, list);
- else {
- lua_assert(target < fs->pc);
- patchlistaux(fs, list, target, NO_REG, target);
- }
-}
-
-
-void luaK_patchtohere (FuncState *fs, int list) {
- luaK_getlabel(fs);
- luaK_concat(fs, &fs->jpc, list);
-}
-
-
-void luaK_concat (FuncState *fs, int *l1, int l2) {
- if (l2 == NO_JUMP) return;
- else if (*l1 == NO_JUMP)
- *l1 = l2;
- else {
- int list = *l1;
- int next;
- while ((next = getjump(fs, list)) != NO_JUMP) /* find last element */
- list = next;
- fixjump(fs, list, l2);
- }
-}
-
-
-void luaK_checkstack (FuncState *fs, int n) {
- int newstack = fs->freereg + n;
- if (newstack > fs->f->maxstacksize) {
- if (newstack >= MAXSTACK)
- luaX_syntaxerror(fs->ls, "function or expression too complex");
- fs->f->maxstacksize = cast_byte(newstack);
- }
-}
-
-
-void luaK_reserveregs (FuncState *fs, int n) {
- luaK_checkstack(fs, n);
- fs->freereg += n;
-}
-
-
-static void freereg (FuncState *fs, int reg) {
- if (!ISK(reg) && reg >= fs->nactvar) {
- fs->freereg--;
- lua_assert(reg == fs->freereg);
- }
-}
-
-
-static void freeexp (FuncState *fs, expdesc *e) {
- if (e->k == VNONRELOC)
- freereg(fs, e->u.s.info);
-}
-
-
-static int addk (FuncState *fs, TValue *k, TValue *v) {
- lua_State *L = fs->L;
- TValue *idx = luaH_set(L, fs->h, k);
- Proto *f = fs->f;
- int oldsize = f->sizek;
- if (ttisnumber(idx)) {
- lua_assert(luaO_rawequalObj(&fs->f->k[cast_int(nvalue(idx))], v));
- return cast_int(nvalue(idx));
- }
- else { /* constant not found; create a new entry */
- setnvalue(idx, cast_num(fs->nk));
- luaM_growvector(L, f->k, fs->nk, f->sizek, TValue,
- MAXARG_Bx, "constant table overflow");
- while (oldsize < f->sizek) setnilvalue(&f->k[oldsize++]);
- setobj(L, &f->k[fs->nk], v);
- luaC_barrier(L, f, v);
- return fs->nk++;
- }
-}
-
-
-int luaK_stringK (FuncState *fs, TString *s) {
- TValue o;
- setsvalue(fs->L, &o, s);
- return addk(fs, &o, &o);
-}
-
-
-int luaK_numberK (FuncState *fs, lua_Number r) {
- TValue o;
- setnvalue(&o, r);
- return addk(fs, &o, &o);
-}
-
-
-static int boolK (FuncState *fs, int b) {
- TValue o;
- setbvalue(&o, b);
- return addk(fs, &o, &o);
-}
-
-
-static int nilK (FuncState *fs) {
- TValue k, v;
- setnilvalue(&v);
- /* cannot use nil as key; instead use table itself to represent nil */
- sethvalue(fs->L, &k, fs->h);
- return addk(fs, &k, &v);
-}
-
-
-void luaK_setreturns (FuncState *fs, expdesc *e, int nresults) {
- if (e->k == VCALL) { /* expression is an open function call? */
- SETARG_C(getcode(fs, e), nresults+1);
- }
- else if (e->k == VVARARG) {
- SETARG_B(getcode(fs, e), nresults+1);
- SETARG_A(getcode(fs, e), fs->freereg);
- luaK_reserveregs(fs, 1);
- }
-}
-
-
-void luaK_setoneret (FuncState *fs, expdesc *e) {
- if (e->k == VCALL) { /* expression is an open function call? */
- e->k = VNONRELOC;
- e->u.s.info = GETARG_A(getcode(fs, e));
- }
- else if (e->k == VVARARG) {
- SETARG_B(getcode(fs, e), 2);
- e->k = VRELOCABLE; /* can relocate its simple result */
- }
-}
-
-
-void luaK_dischargevars (FuncState *fs, expdesc *e) {
- switch (e->k) {
- case VLOCAL: {
- e->k = VNONRELOC;
- break;
- }
- case VUPVAL: {
- e->u.s.info = luaK_codeABC(fs, OP_GETUPVAL, 0, e->u.s.info, 0);
- e->k = VRELOCABLE;
- break;
- }
- case VGLOBAL: {
- e->u.s.info = luaK_codeABx(fs, OP_GETGLOBAL, 0, e->u.s.info);
- e->k = VRELOCABLE;
- break;
- }
- case VINDEXED: {
- freereg(fs, e->u.s.aux);
- freereg(fs, e->u.s.info);
- e->u.s.info = luaK_codeABC(fs, OP_GETTABLE, 0, e->u.s.info, e->u.s.aux);
- e->k = VRELOCABLE;
- break;
- }
- case VVARARG:
- case VCALL: {
- luaK_setoneret(fs, e);
- break;
- }
- default: break; /* there is one value available (somewhere) */
- }
-}
-
-
-static int code_label (FuncState *fs, int A, int b, int jump) {
- luaK_getlabel(fs); /* those instructions may be jump targets */
- return luaK_codeABC(fs, OP_LOADBOOL, A, b, jump);
-}
-
-
-static void discharge2reg (FuncState *fs, expdesc *e, int reg) {
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VNIL: {
- luaK_nil(fs, reg, 1);
- break;
- }
- case VFALSE: case VTRUE: {
- luaK_codeABC(fs, OP_LOADBOOL, reg, e->k == VTRUE, 0);
- break;
- }
- case VK: {
- luaK_codeABx(fs, OP_LOADK, reg, e->u.s.info);
- break;
- }
- case VKNUM: {
- luaK_codeABx(fs, OP_LOADK, reg, luaK_numberK(fs, e->u.nval));
- break;
- }
- case VRELOCABLE: {
- Instruction *pc = &getcode(fs, e);
- SETARG_A(*pc, reg);
- break;
- }
- case VNONRELOC: {
- if (reg != e->u.s.info)
- luaK_codeABC(fs, OP_MOVE, reg, e->u.s.info, 0);
- break;
- }
- default: {
- lua_assert(e->k == VVOID || e->k == VJMP);
- return; /* nothing to do... */
- }
- }
- e->u.s.info = reg;
- e->k = VNONRELOC;
-}
-
-
-static void discharge2anyreg (FuncState *fs, expdesc *e) {
- if (e->k != VNONRELOC) {
- luaK_reserveregs(fs, 1);
- discharge2reg(fs, e, fs->freereg-1);
- }
-}
-
-
-static void exp2reg (FuncState *fs, expdesc *e, int reg) {
- discharge2reg(fs, e, reg);
- if (e->k == VJMP)
- luaK_concat(fs, &e->t, e->u.s.info); /* put this jump in `t' list */
- if (hasjumps(e)) {
- int final; /* position after whole expression */
- int p_f = NO_JUMP; /* position of an eventual LOAD false */
- int p_t = NO_JUMP; /* position of an eventual LOAD true */
- if (need_value(fs, e->t) || need_value(fs, e->f)) {
- int fj = (e->k == VJMP) ? NO_JUMP : luaK_jump(fs);
- p_f = code_label(fs, reg, 0, 1);
- p_t = code_label(fs, reg, 1, 0);
- luaK_patchtohere(fs, fj);
- }
- final = luaK_getlabel(fs);
- patchlistaux(fs, e->f, final, reg, p_f);
- patchlistaux(fs, e->t, final, reg, p_t);
- }
- e->f = e->t = NO_JUMP;
- e->u.s.info = reg;
- e->k = VNONRELOC;
-}
-
-
-void luaK_exp2nextreg (FuncState *fs, expdesc *e) {
- luaK_dischargevars(fs, e);
- freeexp(fs, e);
- luaK_reserveregs(fs, 1);
- exp2reg(fs, e, fs->freereg - 1);
-}
-
-
-int luaK_exp2anyreg (FuncState *fs, expdesc *e) {
- luaK_dischargevars(fs, e);
- if (e->k == VNONRELOC) {
- if (!hasjumps(e)) return e->u.s.info; /* exp is already in a register */
- if (e->u.s.info >= fs->nactvar) { /* reg. is not a local? */
- exp2reg(fs, e, e->u.s.info); /* put value on it */
- return e->u.s.info;
- }
- }
- luaK_exp2nextreg(fs, e); /* default */
- return e->u.s.info;
-}
-
-
-void luaK_exp2val (FuncState *fs, expdesc *e) {
- if (hasjumps(e))
- luaK_exp2anyreg(fs, e);
- else
- luaK_dischargevars(fs, e);
-}
-
-
-int luaK_exp2RK (FuncState *fs, expdesc *e) {
- luaK_exp2val(fs, e);
- switch (e->k) {
- case VKNUM:
- case VTRUE:
- case VFALSE:
- case VNIL: {
- if (fs->nk <= MAXINDEXRK) { /* constant fit in RK operand? */
- e->u.s.info = (e->k == VNIL) ? nilK(fs) :
- (e->k == VKNUM) ? luaK_numberK(fs, e->u.nval) :
- boolK(fs, (e->k == VTRUE));
- e->k = VK;
- return RKASK(e->u.s.info);
- }
- else break;
- }
- case VK: {
- if (e->u.s.info <= MAXINDEXRK) /* constant fit in argC? */
- return RKASK(e->u.s.info);
- else break;
- }
- default: break;
- }
- /* not a constant in the right range: put it in a register */
- return luaK_exp2anyreg(fs, e);
-}
-
-
-void luaK_storevar (FuncState *fs, expdesc *var, expdesc *ex) {
- switch (var->k) {
- case VLOCAL: {
- freeexp(fs, ex);
- exp2reg(fs, ex, var->u.s.info);
- return;
- }
- case VUPVAL: {
- int e = luaK_exp2anyreg(fs, ex);
- luaK_codeABC(fs, OP_SETUPVAL, e, var->u.s.info, 0);
- break;
- }
- case VGLOBAL: {
- int e = luaK_exp2anyreg(fs, ex);
- luaK_codeABx(fs, OP_SETGLOBAL, e, var->u.s.info);
- break;
- }
- case VINDEXED: {
- int e = luaK_exp2RK(fs, ex);
- luaK_codeABC(fs, OP_SETTABLE, var->u.s.info, var->u.s.aux, e);
- break;
- }
- default: {
- lua_assert(0); /* invalid var kind to store */
- break;
- }
- }
- freeexp(fs, ex);
-}
-
-
-void luaK_self (FuncState *fs, expdesc *e, expdesc *key) {
- int func;
- luaK_exp2anyreg(fs, e);
- freeexp(fs, e);
- func = fs->freereg;
- luaK_reserveregs(fs, 2);
- luaK_codeABC(fs, OP_SELF, func, e->u.s.info, luaK_exp2RK(fs, key));
- freeexp(fs, key);
- e->u.s.info = func;
- e->k = VNONRELOC;
-}
-
-
-static void invertjump (FuncState *fs, expdesc *e) {
- Instruction *pc = getjumpcontrol(fs, e->u.s.info);
- lua_assert(testTMode(GET_OPCODE(*pc)) && GET_OPCODE(*pc) != OP_TESTSET &&
- GET_OPCODE(*pc) != OP_TEST);
- SETARG_A(*pc, !(GETARG_A(*pc)));
-}
-
-
-static int jumponcond (FuncState *fs, expdesc *e, int cond) {
- if (e->k == VRELOCABLE) {
- Instruction ie = getcode(fs, e);
- if (GET_OPCODE(ie) == OP_NOT) {
- fs->pc--; /* remove previous OP_NOT */
- return condjump(fs, OP_TEST, GETARG_B(ie), 0, !cond);
- }
- /* else go through */
- }
- discharge2anyreg(fs, e);
- freeexp(fs, e);
- return condjump(fs, OP_TESTSET, NO_REG, e->u.s.info, cond);
-}
-
-
-void luaK_goiftrue (FuncState *fs, expdesc *e) {
- int pc; /* pc of last jump */
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VK: case VKNUM: case VTRUE: {
- pc = NO_JUMP; /* always true; do nothing */
- break;
- }
- case VFALSE: {
- pc = luaK_jump(fs); /* always jump */
- break;
- }
- case VJMP: {
- invertjump(fs, e);
- pc = e->u.s.info;
- break;
- }
- default: {
- pc = jumponcond(fs, e, 0);
- break;
- }
- }
- luaK_concat(fs, &e->f, pc); /* insert last jump in `f' list */
- luaK_patchtohere(fs, e->t);
- e->t = NO_JUMP;
-}
-
-
-static void luaK_goiffalse (FuncState *fs, expdesc *e) {
- int pc; /* pc of last jump */
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VNIL: case VFALSE: {
- pc = NO_JUMP; /* always false; do nothing */
- break;
- }
- case VTRUE: {
- pc = luaK_jump(fs); /* always jump */
- break;
- }
- case VJMP: {
- pc = e->u.s.info;
- break;
- }
- default: {
- pc = jumponcond(fs, e, 1);
- break;
- }
- }
- luaK_concat(fs, &e->t, pc); /* insert last jump in `t' list */
- luaK_patchtohere(fs, e->f);
- e->f = NO_JUMP;
-}
-
-
-static void codenot (FuncState *fs, expdesc *e) {
- luaK_dischargevars(fs, e);
- switch (e->k) {
- case VNIL: case VFALSE: {
- e->k = VTRUE;
- break;
- }
- case VK: case VKNUM: case VTRUE: {
- e->k = VFALSE;
- break;
- }
- case VJMP: {
- invertjump(fs, e);
- break;
- }
- case VRELOCABLE:
- case VNONRELOC: {
- discharge2anyreg(fs, e);
- freeexp(fs, e);
- e->u.s.info = luaK_codeABC(fs, OP_NOT, 0, e->u.s.info, 0);
- e->k = VRELOCABLE;
- break;
- }
- default: {
- lua_assert(0); /* cannot happen */
- break;
- }
- }
- /* interchange true and false lists */
- { int temp = e->f; e->f = e->t; e->t = temp; }
- removevalues(fs, e->f);
- removevalues(fs, e->t);
-}
-
-
-void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k) {
- t->u.s.aux = luaK_exp2RK(fs, k);
- t->k = VINDEXED;
-}
-
-
-static int constfolding (OpCode op, expdesc *e1, expdesc *e2) {
- lua_Number v1, v2, r;
- if (!isnumeral(e1) || !isnumeral(e2)) return 0;
- v1 = e1->u.nval;
- v2 = e2->u.nval;
- switch (op) {
- case OP_ADD: r = luai_numadd(v1, v2); break;
- case OP_SUB: r = luai_numsub(v1, v2); break;
- case OP_MUL: r = luai_nummul(v1, v2); break;
- case OP_DIV:
- if (v2 == 0) return 0; /* do not attempt to divide by 0 */
- r = luai_numdiv(v1, v2); break;
- case OP_MOD:
- if (v2 == 0) return 0; /* do not attempt to divide by 0 */
- r = luai_nummod(v1, v2); break;
- case OP_POW: r = luai_numpow(v1, v2); break;
- case OP_UNM: r = luai_numunm(v1); break;
- case OP_LEN: return 0; /* no constant folding for 'len' */
- default: lua_assert(0); r = 0; break;
- }
- if (luai_numisnan(r)) return 0; /* do not attempt to produce NaN */
- e1->u.nval = r;
- return 1;
-}
-
-
-static void codearith (FuncState *fs, OpCode op, expdesc *e1, expdesc *e2) {
- if (constfolding(op, e1, e2))
- return;
- else {
- int o2 = (op != OP_UNM && op != OP_LEN) ? luaK_exp2RK(fs, e2) : 0;
- int o1 = luaK_exp2RK(fs, e1);
- if (o1 > o2) {
- freeexp(fs, e1);
- freeexp(fs, e2);
- }
- else {
- freeexp(fs, e2);
- freeexp(fs, e1);
- }
- e1->u.s.info = luaK_codeABC(fs, op, 0, o1, o2);
- e1->k = VRELOCABLE;
- }
-}
-
-
-static void codecomp (FuncState *fs, OpCode op, int cond, expdesc *e1,
- expdesc *e2) {
- int o1 = luaK_exp2RK(fs, e1);
- int o2 = luaK_exp2RK(fs, e2);
- freeexp(fs, e2);
- freeexp(fs, e1);
- if (cond == 0 && op != OP_EQ) {
- int temp; /* exchange args to replace by `<' or `<=' */
- temp = o1; o1 = o2; o2 = temp; /* o1 <==> o2 */
- cond = 1;
- }
- e1->u.s.info = condjump(fs, op, cond, o1, o2);
- e1->k = VJMP;
-}
-
-
-void luaK_prefix (FuncState *fs, UnOpr op, expdesc *e) {
- expdesc e2;
- e2.t = e2.f = NO_JUMP; e2.k = VKNUM; e2.u.nval = 0;
- switch (op) {
- case OPR_MINUS: {
- if (!isnumeral(e))
- luaK_exp2anyreg(fs, e); /* cannot operate on non-numeric constants */
- codearith(fs, OP_UNM, e, &e2);
- break;
- }
- case OPR_NOT: codenot(fs, e); break;
- case OPR_LEN: {
- luaK_exp2anyreg(fs, e); /* cannot operate on constants */
- codearith(fs, OP_LEN, e, &e2);
- break;
- }
- default: lua_assert(0);
- }
-}
-
-
-void luaK_infix (FuncState *fs, BinOpr op, expdesc *v) {
- switch (op) {
- case OPR_AND: {
- luaK_goiftrue(fs, v);
- break;
- }
- case OPR_OR: {
- luaK_goiffalse(fs, v);
- break;
- }
- case OPR_CONCAT: {
- luaK_exp2nextreg(fs, v); /* operand must be on the `stack' */
- break;
- }
- case OPR_ADD: case OPR_SUB: case OPR_MUL: case OPR_DIV:
- case OPR_MOD: case OPR_POW: {
- if (!isnumeral(v)) luaK_exp2RK(fs, v);
- break;
- }
- default: {
- luaK_exp2RK(fs, v);
- break;
- }
- }
-}
-
-
-void luaK_posfix (FuncState *fs, BinOpr op, expdesc *e1, expdesc *e2) {
- switch (op) {
- case OPR_AND: {
- lua_assert(e1->t == NO_JUMP); /* list must be closed */
- luaK_dischargevars(fs, e2);
- luaK_concat(fs, &e2->f, e1->f);
- *e1 = *e2;
- break;
- }
- case OPR_OR: {
- lua_assert(e1->f == NO_JUMP); /* list must be closed */
- luaK_dischargevars(fs, e2);
- luaK_concat(fs, &e2->t, e1->t);
- *e1 = *e2;
- break;
- }
- case OPR_CONCAT: {
- luaK_exp2val(fs, e2);
- if (e2->k == VRELOCABLE && GET_OPCODE(getcode(fs, e2)) == OP_CONCAT) {
- lua_assert(e1->u.s.info == GETARG_B(getcode(fs, e2))-1);
- freeexp(fs, e1);
- SETARG_B(getcode(fs, e2), e1->u.s.info);
- e1->k = VRELOCABLE; e1->u.s.info = e2->u.s.info;
- }
- else {
- luaK_exp2nextreg(fs, e2); /* operand must be on the 'stack' */
- codearith(fs, OP_CONCAT, e1, e2);
- }
- break;
- }
- case OPR_ADD: codearith(fs, OP_ADD, e1, e2); break;
- case OPR_SUB: codearith(fs, OP_SUB, e1, e2); break;
- case OPR_MUL: codearith(fs, OP_MUL, e1, e2); break;
- case OPR_DIV: codearith(fs, OP_DIV, e1, e2); break;
- case OPR_MOD: codearith(fs, OP_MOD, e1, e2); break;
- case OPR_POW: codearith(fs, OP_POW, e1, e2); break;
- case OPR_EQ: codecomp(fs, OP_EQ, 1, e1, e2); break;
- case OPR_NE: codecomp(fs, OP_EQ, 0, e1, e2); break;
- case OPR_LT: codecomp(fs, OP_LT, 1, e1, e2); break;
- case OPR_LE: codecomp(fs, OP_LE, 1, e1, e2); break;
- case OPR_GT: codecomp(fs, OP_LT, 0, e1, e2); break;
- case OPR_GE: codecomp(fs, OP_LE, 0, e1, e2); break;
- default: lua_assert(0);
- }
-}
-
-
-void luaK_fixline (FuncState *fs, int line) {
- fs->f->lineinfo[fs->pc - 1] = line;
-}
-
-
-static int luaK_code (FuncState *fs, Instruction i, int line) {
- Proto *f = fs->f;
- dischargejpc(fs); /* `pc' will change */
- /* put new instruction in code array */
- luaM_growvector(fs->L, f->code, fs->pc, f->sizecode, Instruction,
- MAX_INT, "code size overflow");
- f->code[fs->pc] = i;
- /* save corresponding line information */
- luaM_growvector(fs->L, f->lineinfo, fs->pc, f->sizelineinfo, int,
- MAX_INT, "code size overflow");
- f->lineinfo[fs->pc] = line;
- return fs->pc++;
-}
-
-
-int luaK_codeABC (FuncState *fs, OpCode o, int a, int b, int c) {
- lua_assert(getOpMode(o) == iABC);
- lua_assert(getBMode(o) != OpArgN || b == 0);
- lua_assert(getCMode(o) != OpArgN || c == 0);
- return luaK_code(fs, CREATE_ABC(o, a, b, c), fs->ls->lastline);
-}
-
-
-int luaK_codeABx (FuncState *fs, OpCode o, int a, unsigned int bc) {
- lua_assert(getOpMode(o) == iABx || getOpMode(o) == iAsBx);
- lua_assert(getCMode(o) == OpArgN);
- return luaK_code(fs, CREATE_ABx(o, a, bc), fs->ls->lastline);
-}
-
-
-void luaK_setlist (FuncState *fs, int base, int nelems, int tostore) {
- int c = (nelems - 1)/LFIELDS_PER_FLUSH + 1;
- int b = (tostore == LUA_MULTRET) ? 0 : tostore;
- lua_assert(tostore != 0);
- if (c <= MAXARG_C)
- luaK_codeABC(fs, OP_SETLIST, base, b, c);
- else {
- luaK_codeABC(fs, OP_SETLIST, base, b, 0);
- luaK_code(fs, cast(Instruction, c), fs->ls->lastline);
- }
- fs->freereg = base + 1; /* free registers with list values */
-}
+++ /dev/null
-/*
-** $Id: lcode.h,v 1.48.1.1 2007/12/27 13:02:25 roberto Exp $
-** Code generator for Lua
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lcode_h
-#define lcode_h
-
-#include "llex.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-
-
-/*
-** Marks the end of a patch list. It is an invalid value both as an absolute
-** address, and as a list link (would link an element to itself).
-*/
-#define NO_JUMP (-1)
-
-
-/*
-** grep "ORDER OPR" if you change these enums
-*/
-typedef enum BinOpr {
- OPR_ADD, OPR_SUB, OPR_MUL, OPR_DIV, OPR_MOD, OPR_POW,
- OPR_CONCAT,
- OPR_NE, OPR_EQ,
- OPR_LT, OPR_LE, OPR_GT, OPR_GE,
- OPR_AND, OPR_OR,
- OPR_NOBINOPR
-} BinOpr;
-
-
-typedef enum UnOpr { OPR_MINUS, OPR_NOT, OPR_LEN, OPR_NOUNOPR } UnOpr;
-
-
-#define getcode(fs,e) ((fs)->f->code[(e)->u.s.info])
-
-#define luaK_codeAsBx(fs,o,A,sBx) luaK_codeABx(fs,o,A,(sBx)+MAXARG_sBx)
-
-#define luaK_setmultret(fs,e) luaK_setreturns(fs, e, LUA_MULTRET)
-
-LUAI_FUNC int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx);
-LUAI_FUNC int luaK_codeABC (FuncState *fs, OpCode o, int A, int B, int C);
-LUAI_FUNC void luaK_fixline (FuncState *fs, int line);
-LUAI_FUNC void luaK_nil (FuncState *fs, int from, int n);
-LUAI_FUNC void luaK_reserveregs (FuncState *fs, int n);
-LUAI_FUNC void luaK_checkstack (FuncState *fs, int n);
-LUAI_FUNC int luaK_stringK (FuncState *fs, TString *s);
-LUAI_FUNC int luaK_numberK (FuncState *fs, lua_Number r);
-LUAI_FUNC void luaK_dischargevars (FuncState *fs, expdesc *e);
-LUAI_FUNC int luaK_exp2anyreg (FuncState *fs, expdesc *e);
-LUAI_FUNC void luaK_exp2nextreg (FuncState *fs, expdesc *e);
-LUAI_FUNC void luaK_exp2val (FuncState *fs, expdesc *e);
-LUAI_FUNC int luaK_exp2RK (FuncState *fs, expdesc *e);
-LUAI_FUNC void luaK_self (FuncState *fs, expdesc *e, expdesc *key);
-LUAI_FUNC void luaK_indexed (FuncState *fs, expdesc *t, expdesc *k);
-LUAI_FUNC void luaK_goiftrue (FuncState *fs, expdesc *e);
-LUAI_FUNC void luaK_storevar (FuncState *fs, expdesc *var, expdesc *e);
-LUAI_FUNC void luaK_setreturns (FuncState *fs, expdesc *e, int nresults);
-LUAI_FUNC void luaK_setoneret (FuncState *fs, expdesc *e);
-LUAI_FUNC int luaK_jump (FuncState *fs);
-LUAI_FUNC void luaK_ret (FuncState *fs, int first, int nret);
-LUAI_FUNC void luaK_patchlist (FuncState *fs, int list, int target);
-LUAI_FUNC void luaK_patchtohere (FuncState *fs, int list);
-LUAI_FUNC void luaK_concat (FuncState *fs, int *l1, int l2);
-LUAI_FUNC int luaK_getlabel (FuncState *fs);
-LUAI_FUNC void luaK_prefix (FuncState *fs, UnOpr op, expdesc *v);
-LUAI_FUNC void luaK_infix (FuncState *fs, BinOpr op, expdesc *v);
-LUAI_FUNC void luaK_posfix (FuncState *fs, BinOpr op, expdesc *v1, expdesc *v2);
-LUAI_FUNC void luaK_setlist (FuncState *fs, int base, int nelems, int tostore);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ldblib.c,v 1.104.1.3 2008/01/21 13:11:21 roberto Exp $
-** Interface from Lua to its debug API
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define ldblib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-static int db_getregistry (lua_State *L) {
- lua_pushvalue(L, LUA_REGISTRYINDEX);
- return 1;
-}
-
-
-static int db_getmetatable (lua_State *L) {
- luaL_checkany(L, 1);
- if (!lua_getmetatable(L, 1)) {
- lua_pushnil(L); /* no metatable */
- }
- return 1;
-}
-
-
-static int db_setmetatable (lua_State *L) {
- int t = lua_type(L, 2);
- luaL_argcheck(L, t == LUA_TNIL || t == LUA_TTABLE, 2,
- "nil or table expected");
- lua_settop(L, 2);
- lua_pushboolean(L, lua_setmetatable(L, 1));
- return 1;
-}
-
-
-static int db_getfenv (lua_State *L) {
- lua_getfenv(L, 1);
- return 1;
-}
-
-
-static int db_setfenv (lua_State *L) {
- luaL_checktype(L, 2, LUA_TTABLE);
- lua_settop(L, 2);
- if (lua_setfenv(L, 1) == 0)
- luaL_error(L, LUA_QL("setfenv")
- " cannot change environment of given object");
- return 1;
-}
-
-
-static void settabss (lua_State *L, const char *i, const char *v) {
- lua_pushstring(L, v);
- lua_setfield(L, -2, i);
-}
-
-
-static void settabsi (lua_State *L, const char *i, int v) {
- lua_pushinteger(L, v);
- lua_setfield(L, -2, i);
-}
-
-
-static lua_State *getthread (lua_State *L, int *arg) {
- if (lua_isthread(L, 1)) {
- *arg = 1;
- return lua_tothread(L, 1);
- }
- else {
- *arg = 0;
- return L;
- }
-}
-
-
-static void treatstackoption (lua_State *L, lua_State *L1, const char *fname) {
- if (L == L1) {
- lua_pushvalue(L, -2);
- lua_remove(L, -3);
- }
- else
- lua_xmove(L1, L, 1);
- lua_setfield(L, -2, fname);
-}
-
-
-static int db_getinfo (lua_State *L) {
- lua_Debug ar;
- int arg;
- lua_State *L1 = getthread(L, &arg);
- const char *options = luaL_optstring(L, arg+2, "flnSu");
- if (lua_isnumber(L, arg+1)) {
- if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
- lua_pushnil(L); /* level out of range */
- return 1;
- }
- }
- else if (lua_isfunction(L, arg+1)) {
- lua_pushfstring(L, ">%s", options);
- options = lua_tostring(L, -1);
- lua_pushvalue(L, arg+1);
- lua_xmove(L, L1, 1);
- }
- else
- return luaL_argerror(L, arg+1, "function or level expected");
- if (!lua_getinfo(L1, options, &ar))
- return luaL_argerror(L, arg+2, "invalid option");
- lua_createtable(L, 0, 2);
- if (strchr(options, 'S')) {
- settabss(L, "source", ar.source);
- settabss(L, "short_src", ar.short_src);
- settabsi(L, "linedefined", ar.linedefined);
- settabsi(L, "lastlinedefined", ar.lastlinedefined);
- settabss(L, "what", ar.what);
- }
- if (strchr(options, 'l'))
- settabsi(L, "currentline", ar.currentline);
- if (strchr(options, 'u'))
- settabsi(L, "nups", ar.nups);
- if (strchr(options, 'n')) {
- settabss(L, "name", ar.name);
- settabss(L, "namewhat", ar.namewhat);
- }
- if (strchr(options, 'L'))
- treatstackoption(L, L1, "activelines");
- if (strchr(options, 'f'))
- treatstackoption(L, L1, "func");
- return 1; /* return table */
-}
-
-
-static int db_getlocal (lua_State *L) {
- int arg;
- lua_State *L1 = getthread(L, &arg);
- lua_Debug ar;
- const char *name;
- if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
- return luaL_argerror(L, arg+1, "level out of range");
- name = lua_getlocal(L1, &ar, luaL_checkint(L, arg+2));
- if (name) {
- lua_xmove(L1, L, 1);
- lua_pushstring(L, name);
- lua_pushvalue(L, -2);
- return 2;
- }
- else {
- lua_pushnil(L);
- return 1;
- }
-}
-
-
-static int db_setlocal (lua_State *L) {
- int arg;
- lua_State *L1 = getthread(L, &arg);
- lua_Debug ar;
- if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
- return luaL_argerror(L, arg+1, "level out of range");
- luaL_checkany(L, arg+3);
- lua_settop(L, arg+3);
- lua_xmove(L, L1, 1);
- lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
- return 1;
-}
-
-
-static int auxupvalue (lua_State *L, int get) {
- const char *name;
- int n = luaL_checkint(L, 2);
- luaL_checktype(L, 1, LUA_TFUNCTION);
- if (lua_iscfunction(L, 1)) return 0; /* cannot touch C upvalues from Lua */
- name = get ? lua_getupvalue(L, 1, n) : lua_setupvalue(L, 1, n);
- if (name == NULL) return 0;
- lua_pushstring(L, name);
- lua_insert(L, -(get+1));
- return get + 1;
-}
-
-
-static int db_getupvalue (lua_State *L) {
- return auxupvalue(L, 1);
-}
-
-
-static int db_setupvalue (lua_State *L) {
- luaL_checkany(L, 3);
- return auxupvalue(L, 0);
-}
-
-
-
-static const char KEY_HOOK = 'h';
-
-
-static void hookf (lua_State *L, lua_Debug *ar) {
- static const char *const hooknames[] =
- {"call", "return", "line", "count", "tail return"};
- lua_pushlightuserdata(L, (void *)&KEY_HOOK);
- lua_rawget(L, LUA_REGISTRYINDEX);
- lua_pushlightuserdata(L, L);
- lua_rawget(L, -2);
- if (lua_isfunction(L, -1)) {
- lua_pushstring(L, hooknames[(int)ar->event]);
- if (ar->currentline >= 0)
- lua_pushinteger(L, ar->currentline);
- else lua_pushnil(L);
- lua_assert(lua_getinfo(L, "lS", ar));
- lua_call(L, 2, 0);
- }
-}
-
-
-static int makemask (const char *smask, int count) {
- int mask = 0;
- if (strchr(smask, 'c')) mask |= LUA_MASKCALL;
- if (strchr(smask, 'r')) mask |= LUA_MASKRET;
- if (strchr(smask, 'l')) mask |= LUA_MASKLINE;
- if (count > 0) mask |= LUA_MASKCOUNT;
- return mask;
-}
-
-
-static char *unmakemask (int mask, char *smask) {
- int i = 0;
- if (mask & LUA_MASKCALL) smask[i++] = 'c';
- if (mask & LUA_MASKRET) smask[i++] = 'r';
- if (mask & LUA_MASKLINE) smask[i++] = 'l';
- smask[i] = '\0';
- return smask;
-}
-
-
-static void gethooktable (lua_State *L) {
- lua_pushlightuserdata(L, (void *)&KEY_HOOK);
- lua_rawget(L, LUA_REGISTRYINDEX);
- if (!lua_istable(L, -1)) {
- lua_pop(L, 1);
- lua_createtable(L, 0, 1);
- lua_pushlightuserdata(L, (void *)&KEY_HOOK);
- lua_pushvalue(L, -2);
- lua_rawset(L, LUA_REGISTRYINDEX);
- }
-}
-
-
-static int db_sethook (lua_State *L) {
- int arg, mask, count;
- lua_Hook func;
- lua_State *L1 = getthread(L, &arg);
- if (lua_isnoneornil(L, arg+1)) {
- lua_settop(L, arg+1);
- func = NULL; mask = 0; count = 0; /* turn off hooks */
- }
- else {
- const char *smask = luaL_checkstring(L, arg+2);
- luaL_checktype(L, arg+1, LUA_TFUNCTION);
- count = luaL_optint(L, arg+3, 0);
- func = hookf; mask = makemask(smask, count);
- }
- gethooktable(L);
- lua_pushlightuserdata(L, L1);
- lua_pushvalue(L, arg+1);
- lua_rawset(L, -3); /* set new hook */
- lua_pop(L, 1); /* remove hook table */
- lua_sethook(L1, func, mask, count); /* set hooks */
- return 0;
-}
-
-
-static int db_gethook (lua_State *L) {
- int arg;
- lua_State *L1 = getthread(L, &arg);
- char buff[5];
- int mask = lua_gethookmask(L1);
- lua_Hook hook = lua_gethook(L1);
- if (hook != NULL && hook != hookf) /* external hook? */
- lua_pushliteral(L, "external hook");
- else {
- gethooktable(L);
- lua_pushlightuserdata(L, L1);
- lua_rawget(L, -2); /* get hook */
- lua_remove(L, -2); /* remove hook table */
- }
- lua_pushstring(L, unmakemask(mask, buff));
- lua_pushinteger(L, lua_gethookcount(L1));
- return 3;
-}
-
-
-static int db_debug (lua_State *L) {
- for (;;) {
- char buffer[250];
- fputs("lua_debug> ", stderr);
- if (fgets(buffer, sizeof(buffer), stdin) == 0 ||
- strcmp(buffer, "cont\n") == 0)
- return 0;
- if (luaL_loadbuffer(L, buffer, strlen(buffer), "=(debug command)") ||
- lua_pcall(L, 0, 0, 0)) {
- fputs(lua_tostring(L, -1), stderr);
- fputs("\n", stderr);
- }
- lua_settop(L, 0); /* remove eventual returns */
- }
-}
-
-
-#define LEVELS1 12 /* size of the first part of the stack */
-#define LEVELS2 10 /* size of the second part of the stack */
-
-static int db_errorfb (lua_State *L) {
- int level;
- int firstpart = 1; /* still before eventual `...' */
- int arg;
- lua_State *L1 = getthread(L, &arg);
- lua_Debug ar;
- if (lua_isnumber(L, arg+2)) {
- level = (int)lua_tointeger(L, arg+2);
- lua_pop(L, 1);
- }
- else
- level = (L == L1) ? 1 : 0; /* level 0 may be this own function */
- if (lua_gettop(L) == arg)
- lua_pushliteral(L, "");
- else if (!lua_isstring(L, arg+1)) return 1; /* message is not a string */
- else lua_pushliteral(L, "\n");
- lua_pushliteral(L, "stack traceback:");
- while (lua_getstack(L1, level++, &ar)) {
- if (level > LEVELS1 && firstpart) {
- /* no more than `LEVELS2' more levels? */
- if (!lua_getstack(L1, level+LEVELS2, &ar))
- level--; /* keep going */
- else {
- lua_pushliteral(L, "\n\t..."); /* too many levels */
- while (lua_getstack(L1, level+LEVELS2, &ar)) /* find last levels */
- level++;
- }
- firstpart = 0;
- continue;
- }
- lua_pushliteral(L, "\n\t");
- lua_getinfo(L1, "Snl", &ar);
- lua_pushfstring(L, "%s:", ar.short_src);
- if (ar.currentline > 0)
- lua_pushfstring(L, "%d:", ar.currentline);
- if (*ar.namewhat != '\0') /* is there a name? */
- lua_pushfstring(L, " in function " LUA_QS, ar.name);
- else {
- if (*ar.what == 'm') /* main? */
- lua_pushfstring(L, " in main chunk");
- else if (*ar.what == 'C' || *ar.what == 't')
- lua_pushliteral(L, " ?"); /* C function or tail call */
- else
- lua_pushfstring(L, " in function <%s:%d>",
- ar.short_src, ar.linedefined);
- }
- lua_concat(L, lua_gettop(L) - arg);
- }
- lua_concat(L, lua_gettop(L) - arg);
- return 1;
-}
-
-
-static const luaL_Reg dblib[] = {
- {"debug", db_debug},
- {"getfenv", db_getfenv},
- {"gethook", db_gethook},
- {"getinfo", db_getinfo},
- {"getlocal", db_getlocal},
- {"getregistry", db_getregistry},
- {"getmetatable", db_getmetatable},
- {"getupvalue", db_getupvalue},
- {"setfenv", db_setfenv},
- {"sethook", db_sethook},
- {"setlocal", db_setlocal},
- {"setmetatable", db_setmetatable},
- {"setupvalue", db_setupvalue},
- {"traceback", db_errorfb},
- {NULL, NULL}
-};
-
-
-LUALIB_API int luaopen_debug (lua_State *L) {
- luaL_register(L, LUA_DBLIBNAME, dblib);
- return 1;
-}
+++ /dev/null
-/*
-** $Id: ldebug.c,v 2.29.1.6 2008/05/08 16:56:26 roberto Exp $
-** Debug Interface
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdarg.h>
-#include <stddef.h>
-#include <string.h>
-
-
-#define ldebug_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lapi.h"
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lvm.h"
-
-
-
-static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name);
-
-
-static int currentpc (lua_State *L, CallInfo *ci) {
- if (!isLua(ci)) return -1; /* function is not a Lua function? */
- if (ci == L->ci)
- ci->savedpc = L->savedpc;
- return pcRel(ci->savedpc, ci_func(ci)->l.p);
-}
-
-
-static int currentline (lua_State *L, CallInfo *ci) {
- int pc = currentpc(L, ci);
- if (pc < 0)
- return -1; /* only active lua functions have current-line information */
- else
- return getline(ci_func(ci)->l.p, pc);
-}
-
-
-/*
-** this function can be called asynchronous (e.g. during a signal)
-*/
-LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count) {
- if (func == NULL || mask == 0) { /* turn off hooks? */
- mask = 0;
- func = NULL;
- }
- L->hook = func;
- L->basehookcount = count;
- resethookcount(L);
- L->hookmask = cast_byte(mask);
- return 1;
-}
-
-
-LUA_API lua_Hook lua_gethook (lua_State *L) {
- return L->hook;
-}
-
-
-LUA_API int lua_gethookmask (lua_State *L) {
- return L->hookmask;
-}
-
-
-LUA_API int lua_gethookcount (lua_State *L) {
- return L->basehookcount;
-}
-
-
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
- int status;
- CallInfo *ci;
- lua_lock(L);
- for (ci = L->ci; level > 0 && ci > L->base_ci; ci--) {
- level--;
- if (f_isLua(ci)) /* Lua function? */
- level -= ci->tailcalls; /* skip lost tail calls */
- }
- if (level == 0 && ci > L->base_ci) { /* level found? */
- status = 1;
- ar->i_ci = cast_int(ci - L->base_ci);
- }
- else if (level < 0) { /* level is of a lost tail call? */
- status = 1;
- ar->i_ci = 0;
- }
- else status = 0; /* no such level */
- lua_unlock(L);
- return status;
-}
-
-
-static Proto *getluaproto (CallInfo *ci) {
- return (isLua(ci) ? ci_func(ci)->l.p : NULL);
-}
-
-
-static const char *findlocal (lua_State *L, CallInfo *ci, int n) {
- const char *name;
- Proto *fp = getluaproto(ci);
- if (fp && (name = luaF_getlocalname(fp, n, currentpc(L, ci))) != NULL)
- return name; /* is a local variable in a Lua function */
- else {
- StkId limit = (ci == L->ci) ? L->top : (ci+1)->func;
- if (limit - ci->base >= n && n > 0) /* is 'n' inside 'ci' stack? */
- return "(*temporary)";
- else
- return NULL;
- }
-}
-
-
-LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n) {
- CallInfo *ci = L->base_ci + ar->i_ci;
- const char *name = findlocal(L, ci, n);
- lua_lock(L);
- if (name)
- luaA_pushobject(L, ci->base + (n - 1));
- lua_unlock(L);
- return name;
-}
-
-
-LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) {
- CallInfo *ci = L->base_ci + ar->i_ci;
- const char *name = findlocal(L, ci, n);
- lua_lock(L);
- if (name)
- setobjs2s(L, ci->base + (n - 1), L->top - 1);
- L->top--; /* pop value */
- lua_unlock(L);
- return name;
-}
-
-
-static void funcinfo (lua_Debug *ar, Closure *cl) {
- if (cl->c.isC) {
- ar->source = "=[C]";
- ar->linedefined = -1;
- ar->lastlinedefined = -1;
- ar->what = "C";
- }
- else {
- ar->source = getstr(cl->l.p->source);
- ar->linedefined = cl->l.p->linedefined;
- ar->lastlinedefined = cl->l.p->lastlinedefined;
- ar->what = (ar->linedefined == 0) ? "main" : "Lua";
- }
- luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
-}
-
-
-static void info_tailcall (lua_Debug *ar) {
- ar->name = ar->namewhat = "";
- ar->what = "tail";
- ar->lastlinedefined = ar->linedefined = ar->currentline = -1;
- ar->source = "=(tail call)";
- luaO_chunkid(ar->short_src, ar->source, LUA_IDSIZE);
- ar->nups = 0;
-}
-
-
-static void collectvalidlines (lua_State *L, Closure *f) {
- if (f == NULL || f->c.isC) {
- setnilvalue(L->top);
- }
- else {
- Table *t = luaH_new(L, 0, 0);
- int *lineinfo = f->l.p->lineinfo;
- int i;
- for (i=0; i<f->l.p->sizelineinfo; i++)
- setbvalue(luaH_setnum(L, t, lineinfo[i]), 1);
- sethvalue(L, L->top, t);
- }
- incr_top(L);
-}
-
-
-static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar,
- Closure *f, CallInfo *ci) {
- int status = 1;
- if (f == NULL) {
- info_tailcall(ar);
- return status;
- }
- for (; *what; what++) {
- switch (*what) {
- case 'S': {
- funcinfo(ar, f);
- break;
- }
- case 'l': {
- ar->currentline = (ci) ? currentline(L, ci) : -1;
- break;
- }
- case 'u': {
- ar->nups = f->c.nupvalues;
- break;
- }
- case 'n': {
- ar->namewhat = (ci) ? getfuncname(L, ci, &ar->name) : NULL;
- if (ar->namewhat == NULL) {
- ar->namewhat = ""; /* not found */
- ar->name = NULL;
- }
- break;
- }
- case 'L':
- case 'f': /* handled by lua_getinfo */
- break;
- default: status = 0; /* invalid option */
- }
- }
- return status;
-}
-
-
-LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
- int status;
- Closure *f = NULL;
- CallInfo *ci = NULL;
- lua_lock(L);
- if (*what == '>') {
- StkId func = L->top - 1;
- luai_apicheck(L, ttisfunction(func));
- what++; /* skip the '>' */
- f = clvalue(func);
- L->top--; /* pop function */
- }
- else if (ar->i_ci != 0) { /* no tail call? */
- ci = L->base_ci + ar->i_ci;
- lua_assert(ttisfunction(ci->func));
- f = clvalue(ci->func);
- }
- status = auxgetinfo(L, what, ar, f, ci);
- if (strchr(what, 'f')) {
- if (f == NULL) setnilvalue(L->top);
- else setclvalue(L, L->top, f);
- incr_top(L);
- }
- if (strchr(what, 'L'))
- collectvalidlines(L, f);
- lua_unlock(L);
- return status;
-}
-
-
-/*
-** {======================================================
-** Symbolic Execution and code checker
-** =======================================================
-*/
-
-#define check(x) if (!(x)) return 0;
-
-#define checkjump(pt,pc) check(0 <= pc && pc < pt->sizecode)
-
-#define checkreg(pt,reg) check((reg) < (pt)->maxstacksize)
-
-
-
-static int precheck (const Proto *pt) {
- check(pt->maxstacksize <= MAXSTACK);
- check(pt->numparams+(pt->is_vararg & VARARG_HASARG) <= pt->maxstacksize);
- check(!(pt->is_vararg & VARARG_NEEDSARG) ||
- (pt->is_vararg & VARARG_HASARG));
- check(pt->sizeupvalues <= pt->nups);
- check(pt->sizelineinfo == pt->sizecode || pt->sizelineinfo == 0);
- check(pt->sizecode > 0 && GET_OPCODE(pt->code[pt->sizecode-1]) == OP_RETURN);
- return 1;
-}
-
-
-#define checkopenop(pt,pc) luaG_checkopenop((pt)->code[(pc)+1])
-
-int luaG_checkopenop (Instruction i) {
- switch (GET_OPCODE(i)) {
- case OP_CALL:
- case OP_TAILCALL:
- case OP_RETURN:
- case OP_SETLIST: {
- check(GETARG_B(i) == 0);
- return 1;
- }
- default: return 0; /* invalid instruction after an open call */
- }
-}
-
-
-static int checkArgMode (const Proto *pt, int r, enum OpArgMask mode) {
- switch (mode) {
- case OpArgN: check(r == 0); break;
- case OpArgU: break;
- case OpArgR: checkreg(pt, r); break;
- case OpArgK:
- check(ISK(r) ? INDEXK(r) < pt->sizek : r < pt->maxstacksize);
- break;
- }
- return 1;
-}
-
-
-static Instruction symbexec (const Proto *pt, int lastpc, int reg) {
- int pc;
- int last; /* stores position of last instruction that changed `reg' */
- last = pt->sizecode-1; /* points to final return (a `neutral' instruction) */
- check(precheck(pt));
- for (pc = 0; pc < lastpc; pc++) {
- Instruction i = pt->code[pc];
- OpCode op = GET_OPCODE(i);
- int a = GETARG_A(i);
- int b = 0;
- int c = 0;
- check(op < NUM_OPCODES);
- checkreg(pt, a);
- switch (getOpMode(op)) {
- case iABC: {
- b = GETARG_B(i);
- c = GETARG_C(i);
- check(checkArgMode(pt, b, getBMode(op)));
- check(checkArgMode(pt, c, getCMode(op)));
- break;
- }
- case iABx: {
- b = GETARG_Bx(i);
- if (getBMode(op) == OpArgK) check(b < pt->sizek);
- break;
- }
- case iAsBx: {
- b = GETARG_sBx(i);
- if (getBMode(op) == OpArgR) {
- int dest = pc+1+b;
- check(0 <= dest && dest < pt->sizecode);
- if (dest > 0) {
- int j;
- /* check that it does not jump to a setlist count; this
- is tricky, because the count from a previous setlist may
- have the same value of an invalid setlist; so, we must
- go all the way back to the first of them (if any) */
- for (j = 0; j < dest; j++) {
- Instruction d = pt->code[dest-1-j];
- if (!(GET_OPCODE(d) == OP_SETLIST && GETARG_C(d) == 0)) break;
- }
- /* if 'j' is even, previous value is not a setlist (even if
- it looks like one) */
- check((j&1) == 0);
- }
- }
- break;
- }
- }
- if (testAMode(op)) {
- if (a == reg) last = pc; /* change register `a' */
- }
- if (testTMode(op)) {
- check(pc+2 < pt->sizecode); /* check skip */
- check(GET_OPCODE(pt->code[pc+1]) == OP_JMP);
- }
- switch (op) {
- case OP_LOADBOOL: {
- if (c == 1) { /* does it jump? */
- check(pc+2 < pt->sizecode); /* check its jump */
- check(GET_OPCODE(pt->code[pc+1]) != OP_SETLIST ||
- GETARG_C(pt->code[pc+1]) != 0);
- }
- break;
- }
- case OP_LOADNIL: {
- if (a <= reg && reg <= b)
- last = pc; /* set registers from `a' to `b' */
- break;
- }
- case OP_GETUPVAL:
- case OP_SETUPVAL: {
- check(b < pt->nups);
- break;
- }
- case OP_GETGLOBAL:
- case OP_SETGLOBAL: {
- check(ttisstring(&pt->k[b]));
- break;
- }
- case OP_SELF: {
- checkreg(pt, a+1);
- if (reg == a+1) last = pc;
- break;
- }
- case OP_CONCAT: {
- check(b < c); /* at least two operands */
- break;
- }
- case OP_TFORLOOP: {
- check(c >= 1); /* at least one result (control variable) */
- checkreg(pt, a+2+c); /* space for results */
- if (reg >= a+2) last = pc; /* affect all regs above its base */
- break;
- }
- case OP_FORLOOP:
- case OP_FORPREP:
- checkreg(pt, a+3);
- /* go through */
- case OP_JMP: {
- int dest = pc+1+b;
- /* not full check and jump is forward and do not skip `lastpc'? */
- if (reg != NO_REG && pc < dest && dest <= lastpc)
- pc += b; /* do the jump */
- break;
- }
- case OP_CALL:
- case OP_TAILCALL: {
- if (b != 0) {
- checkreg(pt, a+b-1);
- }
- c--; /* c = num. returns */
- if (c == LUA_MULTRET) {
- check(checkopenop(pt, pc));
- }
- else if (c != 0)
- checkreg(pt, a+c-1);
- if (reg >= a) last = pc; /* affect all registers above base */
- break;
- }
- case OP_RETURN: {
- b--; /* b = num. returns */
- if (b > 0) checkreg(pt, a+b-1);
- break;
- }
- case OP_SETLIST: {
- if (b > 0) checkreg(pt, a + b);
- if (c == 0) {
- pc++;
- check(pc < pt->sizecode - 1);
- }
- break;
- }
- case OP_CLOSURE: {
- int nup, j;
- check(b < pt->sizep);
- nup = pt->p[b]->nups;
- check(pc + nup < pt->sizecode);
- for (j = 1; j <= nup; j++) {
- OpCode op1 = GET_OPCODE(pt->code[pc + j]);
- check(op1 == OP_GETUPVAL || op1 == OP_MOVE);
- }
- if (reg != NO_REG) /* tracing? */
- pc += nup; /* do not 'execute' these pseudo-instructions */
- break;
- }
- case OP_VARARG: {
- check((pt->is_vararg & VARARG_ISVARARG) &&
- !(pt->is_vararg & VARARG_NEEDSARG));
- b--;
- if (b == LUA_MULTRET) check(checkopenop(pt, pc));
- checkreg(pt, a+b-1);
- break;
- }
- default: break;
- }
- }
- return pt->code[last];
-}
-
-#undef check
-#undef checkjump
-#undef checkreg
-
-/* }====================================================== */
-
-
-int luaG_checkcode (const Proto *pt) {
- return (symbexec(pt, pt->sizecode, NO_REG) != 0);
-}
-
-
-static const char *kname (Proto *p, int c) {
- if (ISK(c) && ttisstring(&p->k[INDEXK(c)]))
- return svalue(&p->k[INDEXK(c)]);
- else
- return "?";
-}
-
-
-static const char *getobjname (lua_State *L, CallInfo *ci, int stackpos,
- const char **name) {
- if (isLua(ci)) { /* a Lua function? */
- Proto *p = ci_func(ci)->l.p;
- int pc = currentpc(L, ci);
- Instruction i;
- *name = luaF_getlocalname(p, stackpos+1, pc);
- if (*name) /* is a local? */
- return "local";
- i = symbexec(p, pc, stackpos); /* try symbolic execution */
- lua_assert(pc != -1);
- switch (GET_OPCODE(i)) {
- case OP_GETGLOBAL: {
- int g = GETARG_Bx(i); /* global index */
- lua_assert(ttisstring(&p->k[g]));
- *name = svalue(&p->k[g]);
- return "global";
- }
- case OP_MOVE: {
- int a = GETARG_A(i);
- int b = GETARG_B(i); /* move from `b' to `a' */
- if (b < a)
- return getobjname(L, ci, b, name); /* get name for `b' */
- break;
- }
- case OP_GETTABLE: {
- int k = GETARG_C(i); /* key index */
- *name = kname(p, k);
- return "field";
- }
- case OP_GETUPVAL: {
- int u = GETARG_B(i); /* upvalue index */
- *name = p->upvalues ? getstr(p->upvalues[u]) : "?";
- return "upvalue";
- }
- case OP_SELF: {
- int k = GETARG_C(i); /* key index */
- *name = kname(p, k);
- return "method";
- }
- default: break;
- }
- }
- return NULL; /* no useful name found */
-}
-
-
-static const char *getfuncname (lua_State *L, CallInfo *ci, const char **name) {
- Instruction i;
- if ((isLua(ci) && ci->tailcalls > 0) || !isLua(ci - 1))
- return NULL; /* calling function is not Lua (or is unknown) */
- ci--; /* calling function */
- i = ci_func(ci)->l.p->code[currentpc(L, ci)];
- if (GET_OPCODE(i) == OP_CALL || GET_OPCODE(i) == OP_TAILCALL ||
- GET_OPCODE(i) == OP_TFORLOOP)
- return getobjname(L, ci, GETARG_A(i), name);
- else
- return NULL; /* no useful name can be found */
-}
-
-
-/* only ANSI way to check whether a pointer points to an array */
-static int isinstack (CallInfo *ci, const TValue *o) {
- StkId p;
- for (p = ci->base; p < ci->top; p++)
- if (o == p) return 1;
- return 0;
-}
-
-
-void luaG_typeerror (lua_State *L, const TValue *o, const char *op) {
- const char *name = NULL;
- const char *t = luaT_typenames[ttype(o)];
- const char *kind = (isinstack(L->ci, o)) ?
- getobjname(L, L->ci, cast_int(o - L->base), &name) :
- NULL;
- if (kind)
- luaG_runerror(L, "attempt to %s %s " LUA_QS " (a %s value)",
- op, kind, name, t);
- else
- luaG_runerror(L, "attempt to %s a %s value", op, t);
-}
-
-
-void luaG_concaterror (lua_State *L, StkId p1, StkId p2) {
- if (ttisstring(p1) || ttisnumber(p1)) p1 = p2;
- lua_assert(!ttisstring(p1) && !ttisnumber(p1));
- luaG_typeerror(L, p1, "concatenate");
-}
-
-
-void luaG_aritherror (lua_State *L, const TValue *p1, const TValue *p2) {
- TValue temp;
- if (luaV_tonumber(p1, &temp) == NULL)
- p2 = p1; /* first operand is wrong */
- luaG_typeerror(L, p2, "perform arithmetic on");
-}
-
-
-int luaG_ordererror (lua_State *L, const TValue *p1, const TValue *p2) {
- const char *t1 = luaT_typenames[ttype(p1)];
- const char *t2 = luaT_typenames[ttype(p2)];
- if (t1[2] == t2[2])
- luaG_runerror(L, "attempt to compare two %s values", t1);
- else
- luaG_runerror(L, "attempt to compare %s with %s", t1, t2);
- return 0;
-}
-
-
-static void addinfo (lua_State *L, const char *msg) {
- CallInfo *ci = L->ci;
- if (isLua(ci)) { /* is Lua code? */
- char buff[LUA_IDSIZE]; /* add file:line information */
- int line = currentline(L, ci);
- luaO_chunkid(buff, getstr(getluaproto(ci)->source), LUA_IDSIZE);
- luaO_pushfstring(L, "%s:%d: %s", buff, line, msg);
- }
-}
-
-
-void luaG_errormsg (lua_State *L) {
- if (L->errfunc != 0) { /* is there an error handling function? */
- StkId errfunc = restorestack(L, L->errfunc);
- if (!ttisfunction(errfunc)) luaD_throw(L, LUA_ERRERR);
- setobjs2s(L, L->top, L->top - 1); /* move argument */
- setobjs2s(L, L->top - 1, errfunc); /* push function */
- incr_top(L);
- luaD_call(L, L->top - 2, 1); /* call it */
- }
- luaD_throw(L, LUA_ERRRUN);
-}
-
-
-void luaG_runerror (lua_State *L, const char *fmt, ...) {
- va_list argp;
- va_start(argp, fmt);
- addinfo(L, luaO_pushvfstring(L, fmt, argp));
- va_end(argp);
- luaG_errormsg(L);
-}
+++ /dev/null
-/*
-** $Id: ldebug.h,v 2.3.1.1 2007/12/27 13:02:25 roberto Exp $
-** Auxiliary functions from Debug Interface module
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ldebug_h
-#define ldebug_h
-
-
-#include "lstate.h"
-
-
-#define pcRel(pc, p) (cast(int, (pc) - (p)->code) - 1)
-
-#define getline(f,pc) (((f)->lineinfo) ? (f)->lineinfo[pc] : 0)
-
-#define resethookcount(L) (L->hookcount = L->basehookcount)
-
-
-LUAI_FUNC void luaG_typeerror (lua_State *L, const TValue *o,
- const char *opname);
-LUAI_FUNC void luaG_concaterror (lua_State *L, StkId p1, StkId p2);
-LUAI_FUNC void luaG_aritherror (lua_State *L, const TValue *p1,
- const TValue *p2);
-LUAI_FUNC int luaG_ordererror (lua_State *L, const TValue *p1,
- const TValue *p2);
-LUAI_FUNC void luaG_runerror (lua_State *L, const char *fmt, ...);
-LUAI_FUNC void luaG_errormsg (lua_State *L);
-LUAI_FUNC int luaG_checkcode (const Proto *pt);
-LUAI_FUNC int luaG_checkopenop (Instruction i);
-
-#endif
+++ /dev/null
-/*
-** $Id: ldo.c,v 2.38.1.3 2008/01/18 22:31:22 roberto Exp $
-** Stack and Call structure of Lua
-** See Copyright Notice in lua.h
-*/
-
-
-#include <setjmp.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define ldo_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lundump.h"
-#include "lvm.h"
-#include "lzio.h"
-
-
-
-
-/*
-** {======================================================
-** Error-recovery functions
-** =======================================================
-*/
-
-
-/* chain list of long jump buffers */
-struct lua_longjmp {
- struct lua_longjmp *previous;
- luai_jmpbuf b;
- volatile int status; /* error code */
-};
-
-
-void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop) {
- switch (errcode) {
- case LUA_ERRMEM: {
- setsvalue2s(L, oldtop, luaS_newliteral(L, MEMERRMSG));
- break;
- }
- case LUA_ERRERR: {
- setsvalue2s(L, oldtop, luaS_newliteral(L, "error in error handling"));
- break;
- }
- case LUA_ERRSYNTAX:
- case LUA_ERRRUN: {
- setobjs2s(L, oldtop, L->top - 1); /* error message on current top */
- break;
- }
- }
- L->top = oldtop + 1;
-}
-
-
-static void restore_stack_limit (lua_State *L) {
- lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1);
- if (L->size_ci > LUAI_MAXCALLS) { /* there was an overflow? */
- int inuse = cast_int(L->ci - L->base_ci);
- if (inuse + 1 < LUAI_MAXCALLS) /* can `undo' overflow? */
- luaD_reallocCI(L, LUAI_MAXCALLS);
- }
-}
-
-
-static void resetstack (lua_State *L, int status) {
- L->ci = L->base_ci;
- L->base = L->ci->base;
- luaF_close(L, L->base); /* close eventual pending closures */
- luaD_seterrorobj(L, status, L->base);
- L->nCcalls = L->baseCcalls;
- L->allowhook = 1;
- restore_stack_limit(L);
- L->errfunc = 0;
- L->errorJmp = NULL;
-}
-
-
-void luaD_throw (lua_State *L, int errcode) {
- if (L->errorJmp) {
- L->errorJmp->status = errcode;
- LUAI_THROW(L, L->errorJmp);
- }
- else {
- L->status = cast_byte(errcode);
- if (G(L)->panic) {
- resetstack(L, errcode);
- lua_unlock(L);
- G(L)->panic(L);
- }
- exit(EXIT_FAILURE);
- }
-}
-
-
-int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud) {
- struct lua_longjmp lj;
- lj.status = 0;
- lj.previous = L->errorJmp; /* chain new error handler */
- L->errorJmp = &lj;
- LUAI_TRY(L, &lj,
- (*f)(L, ud);
- );
- L->errorJmp = lj.previous; /* restore old error handler */
- return lj.status;
-}
-
-/* }====================================================== */
-
-
-static void correctstack (lua_State *L, TValue *oldstack) {
- CallInfo *ci;
- GCObject *up;
- L->top = (L->top - oldstack) + L->stack;
- for (up = L->openupval; up != NULL; up = up->gch.next)
- gco2uv(up)->v = (gco2uv(up)->v - oldstack) + L->stack;
- for (ci = L->base_ci; ci <= L->ci; ci++) {
- ci->top = (ci->top - oldstack) + L->stack;
- ci->base = (ci->base - oldstack) + L->stack;
- ci->func = (ci->func - oldstack) + L->stack;
- }
- L->base = (L->base - oldstack) + L->stack;
-}
-
-
-void luaD_reallocstack (lua_State *L, int newsize) {
- TValue *oldstack = L->stack;
- int realsize = newsize + 1 + EXTRA_STACK;
- lua_assert(L->stack_last - L->stack == L->stacksize - EXTRA_STACK - 1);
- luaM_reallocvector(L, L->stack, L->stacksize, realsize, TValue);
- L->stacksize = realsize;
- L->stack_last = L->stack+newsize;
- correctstack(L, oldstack);
-}
-
-
-void luaD_reallocCI (lua_State *L, int newsize) {
- CallInfo *oldci = L->base_ci;
- luaM_reallocvector(L, L->base_ci, L->size_ci, newsize, CallInfo);
- L->size_ci = newsize;
- L->ci = (L->ci - oldci) + L->base_ci;
- L->end_ci = L->base_ci + L->size_ci - 1;
-}
-
-
-void luaD_growstack (lua_State *L, int n) {
- if (n <= L->stacksize) /* double size is enough? */
- luaD_reallocstack(L, 2*L->stacksize);
- else
- luaD_reallocstack(L, L->stacksize + n);
-}
-
-
-static CallInfo *growCI (lua_State *L) {
- if (L->size_ci > LUAI_MAXCALLS) /* overflow while handling overflow? */
- luaD_throw(L, LUA_ERRERR);
- else {
- luaD_reallocCI(L, 2*L->size_ci);
- if (L->size_ci > LUAI_MAXCALLS)
- luaG_runerror(L, "stack overflow");
- }
- return ++L->ci;
-}
-
-
-void luaD_callhook (lua_State *L, int event, int line) {
- lua_Hook hook = L->hook;
- if (hook && L->allowhook) {
- ptrdiff_t top = savestack(L, L->top);
- ptrdiff_t ci_top = savestack(L, L->ci->top);
- lua_Debug ar;
- ar.event = event;
- ar.currentline = line;
- if (event == LUA_HOOKTAILRET)
- ar.i_ci = 0; /* tail call; no debug information about it */
- else
- ar.i_ci = cast_int(L->ci - L->base_ci);
- luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
- L->ci->top = L->top + LUA_MINSTACK;
- lua_assert(L->ci->top <= L->stack_last);
- L->allowhook = 0; /* cannot call hooks inside a hook */
- lua_unlock(L);
- (*hook)(L, &ar);
- lua_lock(L);
- lua_assert(!L->allowhook);
- L->allowhook = 1;
- L->ci->top = restorestack(L, ci_top);
- L->top = restorestack(L, top);
- }
-}
-
-
-static StkId adjust_varargs (lua_State *L, Proto *p, int actual) {
- int i;
- int nfixargs = p->numparams;
- Table *htab = NULL;
- StkId base, fixed;
- for (; actual < nfixargs; ++actual)
- setnilvalue(L->top++);
-#if defined(LUA_COMPAT_VARARG)
- if (p->is_vararg & VARARG_NEEDSARG) { /* compat. with old-style vararg? */
- int nvar = actual - nfixargs; /* number of extra arguments */
- lua_assert(p->is_vararg & VARARG_HASARG);
- luaC_checkGC(L);
- htab = luaH_new(L, nvar, 1); /* create `arg' table */
- for (i=0; i<nvar; i++) /* put extra arguments into `arg' table */
- setobj2n(L, luaH_setnum(L, htab, i+1), L->top - nvar + i);
- /* store counter in field `n' */
- setnvalue(luaH_setstr(L, htab, luaS_newliteral(L, "n")), cast_num(nvar));
- }
-#endif
- /* move fixed parameters to final position */
- fixed = L->top - actual; /* first fixed argument */
- base = L->top; /* final position of first argument */
- for (i=0; i<nfixargs; i++) {
- setobjs2s(L, L->top++, fixed+i);
- setnilvalue(fixed+i);
- }
- /* add `arg' parameter */
- if (htab) {
- sethvalue(L, L->top++, htab);
- lua_assert(iswhite(obj2gco(htab)));
- }
- return base;
-}
-
-
-static StkId tryfuncTM (lua_State *L, StkId func) {
- const TValue *tm = luaT_gettmbyobj(L, func, TM_CALL);
- StkId p;
- ptrdiff_t funcr = savestack(L, func);
- if (!ttisfunction(tm))
- luaG_typeerror(L, func, "call");
- /* Open a hole inside the stack at `func' */
- for (p = L->top; p > func; p--) setobjs2s(L, p, p-1);
- incr_top(L);
- func = restorestack(L, funcr); /* previous call may change stack */
- setobj2s(L, func, tm); /* tag method is the new function to be called */
- return func;
-}
-
-
-
-#define inc_ci(L) \
- ((L->ci == L->end_ci) ? growCI(L) : \
- (condhardstacktests(luaD_reallocCI(L, L->size_ci)), ++L->ci))
-
-
-int luaD_precall (lua_State *L, StkId func, int nresults) {
- LClosure *cl;
- ptrdiff_t funcr;
- if (!ttisfunction(func)) /* `func' is not a function? */
- func = tryfuncTM(L, func); /* check the `function' tag method */
- funcr = savestack(L, func);
- cl = &clvalue(func)->l;
- L->ci->savedpc = L->savedpc;
- if (!cl->isC) { /* Lua function? prepare its call */
- CallInfo *ci;
- StkId st, base;
- Proto *p = cl->p;
- luaD_checkstack(L, p->maxstacksize);
- func = restorestack(L, funcr);
- if (!p->is_vararg) { /* no varargs? */
- base = func + 1;
- if (L->top > base + p->numparams)
- L->top = base + p->numparams;
- }
- else { /* vararg function */
- int nargs = cast_int(L->top - func) - 1;
- base = adjust_varargs(L, p, nargs);
- func = restorestack(L, funcr); /* previous call may change the stack */
- }
- ci = inc_ci(L); /* now `enter' new function */
- ci->func = func;
- L->base = ci->base = base;
- ci->top = L->base + p->maxstacksize;
- lua_assert(ci->top <= L->stack_last);
- L->savedpc = p->code; /* starting point */
- ci->tailcalls = 0;
- ci->nresults = nresults;
- for (st = L->top; st < ci->top; st++)
- setnilvalue(st);
- L->top = ci->top;
- if (L->hookmask & LUA_MASKCALL) {
- L->savedpc++; /* hooks assume 'pc' is already incremented */
- luaD_callhook(L, LUA_HOOKCALL, -1);
- L->savedpc--; /* correct 'pc' */
- }
- return PCRLUA;
- }
- else { /* if is a C function, call it */
- CallInfo *ci;
- int n;
- luaD_checkstack(L, LUA_MINSTACK); /* ensure minimum stack size */
- ci = inc_ci(L); /* now `enter' new function */
- ci->func = restorestack(L, funcr);
- L->base = ci->base = ci->func + 1;
- ci->top = L->top + LUA_MINSTACK;
- lua_assert(ci->top <= L->stack_last);
- ci->nresults = nresults;
- if (L->hookmask & LUA_MASKCALL)
- luaD_callhook(L, LUA_HOOKCALL, -1);
- lua_unlock(L);
- n = (*curr_func(L)->c.f)(L); /* do the actual call */
- lua_lock(L);
- if (n < 0) /* yielding? */
- return PCRYIELD;
- else {
- luaD_poscall(L, L->top - n);
- return PCRC;
- }
- }
-}
-
-
-static StkId callrethooks (lua_State *L, StkId firstResult) {
- ptrdiff_t fr = savestack(L, firstResult); /* next call may change stack */
- luaD_callhook(L, LUA_HOOKRET, -1);
- if (f_isLua(L->ci)) { /* Lua function? */
- while ((L->hookmask & LUA_MASKRET) && L->ci->tailcalls--) /* tail calls */
- luaD_callhook(L, LUA_HOOKTAILRET, -1);
- }
- return restorestack(L, fr);
-}
-
-
-int luaD_poscall (lua_State *L, StkId firstResult) {
- StkId res;
- int wanted, i;
- CallInfo *ci;
- if (L->hookmask & LUA_MASKRET)
- firstResult = callrethooks(L, firstResult);
- ci = L->ci--;
- res = ci->func; /* res == final position of 1st result */
- wanted = ci->nresults;
- L->base = (ci - 1)->base; /* restore base */
- L->savedpc = (ci - 1)->savedpc; /* restore savedpc */
- /* move results to correct place */
- for (i = wanted; i != 0 && firstResult < L->top; i--)
- setobjs2s(L, res++, firstResult++);
- while (i-- > 0)
- setnilvalue(res++);
- L->top = res;
- return (wanted - LUA_MULTRET); /* 0 iff wanted == LUA_MULTRET */
-}
-
-
-/*
-** Call a function (C or Lua). The function to be called is at *func.
-** The arguments are on the stack, right after the function.
-** When returns, all the results are on the stack, starting at the original
-** function position.
-*/
-void luaD_call (lua_State *L, StkId func, int nResults) {
- if (++L->nCcalls >= LUAI_MAXCCALLS) {
- if (L->nCcalls == LUAI_MAXCCALLS)
- luaG_runerror(L, "C stack overflow");
- else if (L->nCcalls >= (LUAI_MAXCCALLS + (LUAI_MAXCCALLS>>3)))
- luaD_throw(L, LUA_ERRERR); /* error while handing stack error */
- }
- if (luaD_precall(L, func, nResults) == PCRLUA) /* is a Lua function? */
- luaV_execute(L, 1); /* call it */
- L->nCcalls--;
- luaC_checkGC(L);
-}
-
-
-static void resume (lua_State *L, void *ud) {
- StkId firstArg = cast(StkId, ud);
- CallInfo *ci = L->ci;
- if (L->status == 0) { /* start coroutine? */
- lua_assert(ci == L->base_ci && firstArg > L->base);
- if (luaD_precall(L, firstArg - 1, LUA_MULTRET) != PCRLUA)
- return;
- }
- else { /* resuming from previous yield */
- lua_assert(L->status == LUA_YIELD);
- L->status = 0;
- if (!f_isLua(ci)) { /* `common' yield? */
- /* finish interrupted execution of `OP_CALL' */
- lua_assert(GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_CALL ||
- GET_OPCODE(*((ci-1)->savedpc - 1)) == OP_TAILCALL);
- if (luaD_poscall(L, firstArg)) /* complete it... */
- L->top = L->ci->top; /* and correct top if not multiple results */
- }
- else /* yielded inside a hook: just continue its execution */
- L->base = L->ci->base;
- }
- luaV_execute(L, cast_int(L->ci - L->base_ci));
-}
-
-
-static int resume_error (lua_State *L, const char *msg) {
- L->top = L->ci->base;
- setsvalue2s(L, L->top, luaS_new(L, msg));
- incr_top(L);
- lua_unlock(L);
- return LUA_ERRRUN;
-}
-
-
-LUA_API int lua_resume (lua_State *L, int nargs) {
- int status;
- lua_lock(L);
- if (L->status != LUA_YIELD && (L->status != 0 || L->ci != L->base_ci))
- return resume_error(L, "cannot resume non-suspended coroutine");
- if (L->nCcalls >= LUAI_MAXCCALLS)
- return resume_error(L, "C stack overflow");
- luai_userstateresume(L, nargs);
- lua_assert(L->errfunc == 0);
- L->baseCcalls = ++L->nCcalls;
- status = luaD_rawrunprotected(L, resume, L->top - nargs);
- if (status != 0) { /* error? */
- L->status = cast_byte(status); /* mark thread as `dead' */
- luaD_seterrorobj(L, status, L->top);
- L->ci->top = L->top;
- }
- else {
- lua_assert(L->nCcalls == L->baseCcalls);
- status = L->status;
- }
- --L->nCcalls;
- lua_unlock(L);
- return status;
-}
-
-
-LUA_API int lua_yield (lua_State *L, int nresults) {
- luai_userstateyield(L, nresults);
- lua_lock(L);
- if (L->nCcalls > L->baseCcalls)
- luaG_runerror(L, "attempt to yield across metamethod/C-call boundary");
- L->base = L->top - nresults; /* protect stack slots below */
- L->status = LUA_YIELD;
- lua_unlock(L);
- return -1;
-}
-
-
-int luaD_pcall (lua_State *L, Pfunc func, void *u,
- ptrdiff_t old_top, ptrdiff_t ef) {
- int status;
- unsigned short oldnCcalls = L->nCcalls;
- ptrdiff_t old_ci = saveci(L, L->ci);
- lu_byte old_allowhooks = L->allowhook;
- ptrdiff_t old_errfunc = L->errfunc;
- L->errfunc = ef;
- status = luaD_rawrunprotected(L, func, u);
- if (status != 0) { /* an error occurred? */
- StkId oldtop = restorestack(L, old_top);
- luaF_close(L, oldtop); /* close eventual pending closures */
- luaD_seterrorobj(L, status, oldtop);
- L->nCcalls = oldnCcalls;
- L->ci = restoreci(L, old_ci);
- L->base = L->ci->base;
- L->savedpc = L->ci->savedpc;
- L->allowhook = old_allowhooks;
- restore_stack_limit(L);
- }
- L->errfunc = old_errfunc;
- return status;
-}
-
-
-
-/*
-** Execute a protected parser.
-*/
-struct SParser { /* data to `f_parser' */
- ZIO *z;
- Mbuffer buff; /* buffer to be used by the scanner */
- const char *name;
-};
-
-static void f_parser (lua_State *L, void *ud) {
- int i;
- Proto *tf;
- Closure *cl;
- struct SParser *p = cast(struct SParser *, ud);
- int c = luaZ_lookahead(p->z);
- luaC_checkGC(L);
- tf = ((c == LUA_SIGNATURE[0]) ? luaU_undump : luaY_parser)(L, p->z,
- &p->buff, p->name);
- cl = luaF_newLclosure(L, tf->nups, hvalue(gt(L)));
- cl->l.p = tf;
- for (i = 0; i < tf->nups; i++) /* initialize eventual upvalues */
- cl->l.upvals[i] = luaF_newupval(L);
- setclvalue(L, L->top, cl);
- incr_top(L);
-}
-
-
-int luaD_protectedparser (lua_State *L, ZIO *z, const char *name) {
- struct SParser p;
- int status;
- p.z = z; p.name = name;
- luaZ_initbuffer(L, &p.buff);
- status = luaD_pcall(L, f_parser, &p, savestack(L, L->top), L->errfunc);
- luaZ_freebuffer(L, &p.buff);
- return status;
-}
+++ /dev/null
-/*
-** $Id: ldo.h,v 2.7.1.1 2007/12/27 13:02:25 roberto Exp $
-** Stack and Call structure of Lua
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ldo_h
-#define ldo_h
-
-
-#include "lobject.h"
-#include "lstate.h"
-#include "lzio.h"
-
-
-#define luaD_checkstack(L,n) \
- if ((char *)L->stack_last - (char *)L->top <= (n)*(int)sizeof(TValue)) \
- luaD_growstack(L, n); \
- else condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1));
-
-
-#define incr_top(L) {luaD_checkstack(L,1); L->top++;}
-
-#define savestack(L,p) ((char *)(p) - (char *)L->stack)
-#define restorestack(L,n) ((TValue *)((char *)L->stack + (n)))
-
-#define saveci(L,p) ((char *)(p) - (char *)L->base_ci)
-#define restoreci(L,n) ((CallInfo *)((char *)L->base_ci + (n)))
-
-
-/* results from luaD_precall */
-#define PCRLUA 0 /* initiated a call to a Lua function */
-#define PCRC 1 /* did a call to a C function */
-#define PCRYIELD 2 /* C funtion yielded */
-
-
-/* type of protected functions, to be ran by `runprotected' */
-typedef void (*Pfunc) (lua_State *L, void *ud);
-
-LUAI_FUNC int luaD_protectedparser (lua_State *L, ZIO *z, const char *name);
-LUAI_FUNC void luaD_callhook (lua_State *L, int event, int line);
-LUAI_FUNC int luaD_precall (lua_State *L, StkId func, int nresults);
-LUAI_FUNC void luaD_call (lua_State *L, StkId func, int nResults);
-LUAI_FUNC int luaD_pcall (lua_State *L, Pfunc func, void *u,
- ptrdiff_t oldtop, ptrdiff_t ef);
-LUAI_FUNC int luaD_poscall (lua_State *L, StkId firstResult);
-LUAI_FUNC void luaD_reallocCI (lua_State *L, int newsize);
-LUAI_FUNC void luaD_reallocstack (lua_State *L, int newsize);
-LUAI_FUNC void luaD_growstack (lua_State *L, int n);
-
-LUAI_FUNC void luaD_throw (lua_State *L, int errcode);
-LUAI_FUNC int luaD_rawrunprotected (lua_State *L, Pfunc f, void *ud);
-
-LUAI_FUNC void luaD_seterrorobj (lua_State *L, int errcode, StkId oldtop);
-
-#endif
+++ /dev/null
-/*
-** $Id: ldump.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
-** save precompiled Lua chunks
-** See Copyright Notice in lua.h
-*/
-
-#include <stddef.h>
-
-#define ldump_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "lstate.h"
-#include "lundump.h"
-
-typedef struct {
- lua_State* L;
- lua_Writer writer;
- void* data;
- int strip;
- int status;
-} DumpState;
-
-#define DumpMem(b,n,size,D) DumpBlock(b,(n)*(size),D)
-#define DumpVar(x,D) DumpMem(&x,1,sizeof(x),D)
-
-static void DumpBlock(const void* b, size_t size, DumpState* D)
-{
- if (D->status==0)
- {
- lua_unlock(D->L);
- D->status=(*D->writer)(D->L,b,size,D->data);
- lua_lock(D->L);
- }
-}
-
-static void DumpChar(int y, DumpState* D)
-{
- char x=(char)y;
- DumpVar(x,D);
-}
-
-static void DumpInt(int x, DumpState* D)
-{
- DumpVar(x,D);
-}
-
-static void DumpNumber(lua_Number x, DumpState* D)
-{
- DumpVar(x,D);
-}
-
-static void DumpVector(const void* b, int n, size_t size, DumpState* D)
-{
- DumpInt(n,D);
- DumpMem(b,n,size,D);
-}
-
-static void DumpString(const TString* s, DumpState* D)
-{
- if (s==NULL || getstr(s)==NULL)
- {
- size_t size=0;
- DumpVar(size,D);
- }
- else
- {
- size_t size=s->tsv.len+1; /* include trailing '\0' */
- DumpVar(size,D);
- DumpBlock(getstr(s),size,D);
- }
-}
-
-#define DumpCode(f,D) DumpVector(f->code,f->sizecode,sizeof(Instruction),D)
-
-static void DumpFunction(const Proto* f, const TString* p, DumpState* D);
-
-static void DumpConstants(const Proto* f, DumpState* D)
-{
- int i,n=f->sizek;
- DumpInt(n,D);
- for (i=0; i<n; i++)
- {
- const TValue* o=&f->k[i];
- DumpChar(ttype(o),D);
- switch (ttype(o))
- {
- case LUA_TNIL:
- break;
- case LUA_TBOOLEAN:
- DumpChar(bvalue(o),D);
- break;
- case LUA_TNUMBER:
- DumpNumber(nvalue(o),D);
- break;
- case LUA_TSTRING:
- DumpString(rawtsvalue(o),D);
- break;
- default:
- lua_assert(0); /* cannot happen */
- break;
- }
- }
- n=f->sizep;
- DumpInt(n,D);
- for (i=0; i<n; i++) DumpFunction(f->p[i],f->source,D);
-}
-
-static void DumpDebug(const Proto* f, DumpState* D)
-{
- int i,n;
- n= (D->strip) ? 0 : f->sizelineinfo;
- DumpVector(f->lineinfo,n,sizeof(int),D);
- n= (D->strip) ? 0 : f->sizelocvars;
- DumpInt(n,D);
- for (i=0; i<n; i++)
- {
- DumpString(f->locvars[i].varname,D);
- DumpInt(f->locvars[i].startpc,D);
- DumpInt(f->locvars[i].endpc,D);
- }
- n= (D->strip) ? 0 : f->sizeupvalues;
- DumpInt(n,D);
- for (i=0; i<n; i++) DumpString(f->upvalues[i],D);
-}
-
-static void DumpFunction(const Proto* f, const TString* p, DumpState* D)
-{
- DumpString((f->source==p || D->strip) ? NULL : f->source,D);
- DumpInt(f->linedefined,D);
- DumpInt(f->lastlinedefined,D);
- DumpChar(f->nups,D);
- DumpChar(f->numparams,D);
- DumpChar(f->is_vararg,D);
- DumpChar(f->maxstacksize,D);
- DumpCode(f,D);
- DumpConstants(f,D);
- DumpDebug(f,D);
-}
-
-static void DumpHeader(DumpState* D)
-{
- char h[LUAC_HEADERSIZE];
- luaU_header(h);
- DumpBlock(h,LUAC_HEADERSIZE,D);
-}
-
-/*
-** dump Lua function as precompiled chunk
-*/
-int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip)
-{
- DumpState D;
- D.L=L;
- D.writer=w;
- D.data=data;
- D.strip=strip;
- D.status=0;
- DumpHeader(&D);
- DumpFunction(f,NULL,&D);
- return D.status;
-}
+++ /dev/null
-/*
-** $Id: lfunc.c,v 2.12.1.2 2007/12/28 14:58:43 roberto Exp $
-** Auxiliary functions to manipulate prototypes and closures
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stddef.h>
-
-#define lfunc_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-
-
-
-Closure *luaF_newCclosure (lua_State *L, int nelems, Table *e) {
- Closure *c = cast(Closure *, luaM_malloc(L, sizeCclosure(nelems)));
- luaC_link(L, obj2gco(c), LUA_TFUNCTION);
- c->c.isC = 1;
- c->c.env = e;
- c->c.nupvalues = cast_byte(nelems);
- return c;
-}
-
-
-Closure *luaF_newLclosure (lua_State *L, int nelems, Table *e) {
- Closure *c = cast(Closure *, luaM_malloc(L, sizeLclosure(nelems)));
- luaC_link(L, obj2gco(c), LUA_TFUNCTION);
- c->l.isC = 0;
- c->l.env = e;
- c->l.nupvalues = cast_byte(nelems);
- while (nelems--) c->l.upvals[nelems] = NULL;
- return c;
-}
-
-
-UpVal *luaF_newupval (lua_State *L) {
- UpVal *uv = luaM_new(L, UpVal);
- luaC_link(L, obj2gco(uv), LUA_TUPVAL);
- uv->v = &uv->u.value;
- setnilvalue(uv->v);
- return uv;
-}
-
-
-UpVal *luaF_findupval (lua_State *L, StkId level) {
- global_State *g = G(L);
- GCObject **pp = &L->openupval;
- UpVal *p;
- UpVal *uv;
- while (*pp != NULL && (p = ngcotouv(*pp))->v >= level) {
- lua_assert(p->v != &p->u.value);
- if (p->v == level) { /* found a corresponding upvalue? */
- if (isdead(g, obj2gco(p))) /* is it dead? */
- changewhite(obj2gco(p)); /* ressurect it */
- return p;
- }
- pp = &p->next;
- }
- uv = luaM_new(L, UpVal); /* not found: create a new one */
- uv->tt = LUA_TUPVAL;
- uv->marked = luaC_white(g);
- uv->v = level; /* current value lives in the stack */
- uv->next = *pp; /* chain it in the proper position */
- *pp = obj2gco(uv);
- uv->u.l.prev = &g->uvhead; /* double link it in `uvhead' list */
- uv->u.l.next = g->uvhead.u.l.next;
- uv->u.l.next->u.l.prev = uv;
- g->uvhead.u.l.next = uv;
- lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
- return uv;
-}
-
-
-static void unlinkupval (UpVal *uv) {
- lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
- uv->u.l.next->u.l.prev = uv->u.l.prev; /* remove from `uvhead' list */
- uv->u.l.prev->u.l.next = uv->u.l.next;
-}
-
-
-void luaF_freeupval (lua_State *L, UpVal *uv) {
- if (uv->v != &uv->u.value) /* is it open? */
- unlinkupval(uv); /* remove from open list */
- luaM_free(L, uv); /* free upvalue */
-}
-
-
-void luaF_close (lua_State *L, StkId level) {
- UpVal *uv;
- global_State *g = G(L);
- while (L->openupval != NULL && (uv = ngcotouv(L->openupval))->v >= level) {
- GCObject *o = obj2gco(uv);
- lua_assert(!isblack(o) && uv->v != &uv->u.value);
- L->openupval = uv->next; /* remove from `open' list */
- if (isdead(g, o))
- luaF_freeupval(L, uv); /* free upvalue */
- else {
- unlinkupval(uv);
- setobj(L, &uv->u.value, uv->v);
- uv->v = &uv->u.value; /* now current value lives here */
- luaC_linkupval(L, uv); /* link upvalue into `gcroot' list */
- }
- }
-}
-
-
-Proto *luaF_newproto (lua_State *L) {
- Proto *f = luaM_new(L, Proto);
- luaC_link(L, obj2gco(f), LUA_TPROTO);
- f->k = NULL;
- f->sizek = 0;
- f->p = NULL;
- f->sizep = 0;
- f->code = NULL;
- f->sizecode = 0;
- f->sizelineinfo = 0;
- f->sizeupvalues = 0;
- f->nups = 0;
- f->upvalues = NULL;
- f->numparams = 0;
- f->is_vararg = 0;
- f->maxstacksize = 0;
- f->lineinfo = NULL;
- f->sizelocvars = 0;
- f->locvars = NULL;
- f->linedefined = 0;
- f->lastlinedefined = 0;
- f->source = NULL;
- return f;
-}
-
-
-void luaF_freeproto (lua_State *L, Proto *f) {
- luaM_freearray(L, f->code, f->sizecode, Instruction);
- luaM_freearray(L, f->p, f->sizep, Proto *);
- luaM_freearray(L, f->k, f->sizek, TValue);
- luaM_freearray(L, f->lineinfo, f->sizelineinfo, int);
- luaM_freearray(L, f->locvars, f->sizelocvars, struct LocVar);
- luaM_freearray(L, f->upvalues, f->sizeupvalues, TString *);
- luaM_free(L, f);
-}
-
-
-void luaF_freeclosure (lua_State *L, Closure *c) {
- int size = (c->c.isC) ? sizeCclosure(c->c.nupvalues) :
- sizeLclosure(c->l.nupvalues);
- luaM_freemem(L, c, size);
-}
-
-
-/*
-** Look for n-th local variable at line `line' in function `func'.
-** Returns NULL if not found.
-*/
-const char *luaF_getlocalname (const Proto *f, int local_number, int pc) {
- int i;
- for (i = 0; i<f->sizelocvars && f->locvars[i].startpc <= pc; i++) {
- if (pc < f->locvars[i].endpc) { /* is variable active? */
- local_number--;
- if (local_number == 0)
- return getstr(f->locvars[i].varname);
- }
- }
- return NULL; /* not found */
-}
+++ /dev/null
-/*
-** $Id: lfunc.h,v 2.4.1.1 2007/12/27 13:02:25 roberto Exp $
-** Auxiliary functions to manipulate prototypes and closures
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lfunc_h
-#define lfunc_h
-
-
-#include "lobject.h"
-
-
-#define sizeCclosure(n) (cast(int, sizeof(CClosure)) + \
- cast(int, sizeof(TValue)*((n)-1)))
-
-#define sizeLclosure(n) (cast(int, sizeof(LClosure)) + \
- cast(int, sizeof(TValue *)*((n)-1)))
-
-
-LUAI_FUNC Proto *luaF_newproto (lua_State *L);
-LUAI_FUNC Closure *luaF_newCclosure (lua_State *L, int nelems, Table *e);
-LUAI_FUNC Closure *luaF_newLclosure (lua_State *L, int nelems, Table *e);
-LUAI_FUNC UpVal *luaF_newupval (lua_State *L);
-LUAI_FUNC UpVal *luaF_findupval (lua_State *L, StkId level);
-LUAI_FUNC void luaF_close (lua_State *L, StkId level);
-LUAI_FUNC void luaF_freeproto (lua_State *L, Proto *f);
-LUAI_FUNC void luaF_freeclosure (lua_State *L, Closure *c);
-LUAI_FUNC void luaF_freeupval (lua_State *L, UpVal *uv);
-LUAI_FUNC const char *luaF_getlocalname (const Proto *func, int local_number,
- int pc);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lgc.c,v 2.38.1.1 2007/12/27 13:02:25 roberto Exp $
-** Garbage Collector
-** See Copyright Notice in lua.h
-*/
-
-#include <string.h>
-
-#define lgc_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-
-
-#define GCSTEPSIZE 1024u
-#define GCSWEEPMAX 40
-#define GCSWEEPCOST 10
-#define GCFINALIZECOST 100
-
-
-#define maskmarks cast_byte(~(bitmask(BLACKBIT)|WHITEBITS))
-
-#define makewhite(g,x) \
- ((x)->gch.marked = cast_byte(((x)->gch.marked & maskmarks) | luaC_white(g)))
-
-#define white2gray(x) reset2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
-#define black2gray(x) resetbit((x)->gch.marked, BLACKBIT)
-
-#define stringmark(s) reset2bits((s)->tsv.marked, WHITE0BIT, WHITE1BIT)
-
-
-#define isfinalized(u) testbit((u)->marked, FINALIZEDBIT)
-#define markfinalized(u) l_setbit((u)->marked, FINALIZEDBIT)
-
-
-#define KEYWEAK bitmask(KEYWEAKBIT)
-#define VALUEWEAK bitmask(VALUEWEAKBIT)
-
-
-
-#define markvalue(g,o) { checkconsistency(o); \
- if (iscollectable(o) && iswhite(gcvalue(o))) reallymarkobject(g,gcvalue(o)); }
-
-#define markobject(g,t) { if (iswhite(obj2gco(t))) \
- reallymarkobject(g, obj2gco(t)); }
-
-
-#define setthreshold(g) (g->GCthreshold = (g->estimate/100) * g->gcpause)
-
-
-static void removeentry (Node *n) {
- lua_assert(ttisnil(gval(n)));
- if (iscollectable(gkey(n)))
- setttype(gkey(n), LUA_TDEADKEY); /* dead key; remove it */
-}
-
-
-static void reallymarkobject (global_State *g, GCObject *o) {
- lua_assert(iswhite(o) && !isdead(g, o));
- white2gray(o);
- switch (o->gch.tt) {
- case LUA_TSTRING: {
- return;
- }
- case LUA_TUSERDATA: {
- Table *mt = gco2u(o)->metatable;
- gray2black(o); /* udata are never gray */
- if (mt) markobject(g, mt);
- markobject(g, gco2u(o)->env);
- return;
- }
- case LUA_TUPVAL: {
- UpVal *uv = gco2uv(o);
- markvalue(g, uv->v);
- if (uv->v == &uv->u.value) /* closed? */
- gray2black(o); /* open upvalues are never black */
- return;
- }
- case LUA_TFUNCTION: {
- gco2cl(o)->c.gclist = g->gray;
- g->gray = o;
- break;
- }
- case LUA_TTABLE: {
- gco2h(o)->gclist = g->gray;
- g->gray = o;
- break;
- }
- case LUA_TTHREAD: {
- gco2th(o)->gclist = g->gray;
- g->gray = o;
- break;
- }
- case LUA_TPROTO: {
- gco2p(o)->gclist = g->gray;
- g->gray = o;
- break;
- }
- default: lua_assert(0);
- }
-}
-
-
-static void marktmu (global_State *g) {
- GCObject *u = g->tmudata;
- if (u) {
- do {
- u = u->gch.next;
- makewhite(g, u); /* may be marked, if left from previous GC */
- reallymarkobject(g, u);
- } while (u != g->tmudata);
- }
-}
-
-
-/* move `dead' udata that need finalization to list `tmudata' */
-size_t luaC_separateudata (lua_State *L, int all) {
- global_State *g = G(L);
- size_t deadmem = 0;
- GCObject **p = &g->mainthread->next;
- GCObject *curr;
- while ((curr = *p) != NULL) {
- if (!(iswhite(curr) || all) || isfinalized(gco2u(curr)))
- p = &curr->gch.next; /* don't bother with them */
- else if (fasttm(L, gco2u(curr)->metatable, TM_GC) == NULL) {
- markfinalized(gco2u(curr)); /* don't need finalization */
- p = &curr->gch.next;
- }
- else { /* must call its gc method */
- deadmem += sizeudata(gco2u(curr));
- markfinalized(gco2u(curr));
- *p = curr->gch.next;
- /* link `curr' at the end of `tmudata' list */
- if (g->tmudata == NULL) /* list is empty? */
- g->tmudata = curr->gch.next = curr; /* creates a circular list */
- else {
- curr->gch.next = g->tmudata->gch.next;
- g->tmudata->gch.next = curr;
- g->tmudata = curr;
- }
- }
- }
- return deadmem;
-}
-
-
-static int traversetable (global_State *g, Table *h) {
- int i;
- int weakkey = 0;
- int weakvalue = 0;
- const TValue *mode;
- if (h->metatable)
- markobject(g, h->metatable);
- mode = gfasttm(g, h->metatable, TM_MODE);
- if (mode && ttisstring(mode)) { /* is there a weak mode? */
- weakkey = (strchr(svalue(mode), 'k') != NULL);
- weakvalue = (strchr(svalue(mode), 'v') != NULL);
- if (weakkey || weakvalue) { /* is really weak? */
- h->marked &= ~(KEYWEAK | VALUEWEAK); /* clear bits */
- h->marked |= cast_byte((weakkey << KEYWEAKBIT) |
- (weakvalue << VALUEWEAKBIT));
- h->gclist = g->weak; /* must be cleared after GC, ... */
- g->weak = obj2gco(h); /* ... so put in the appropriate list */
- }
- }
- if (weakkey && weakvalue) return 1;
- if (!weakvalue) {
- i = h->sizearray;
- while (i--)
- markvalue(g, &h->array[i]);
- }
- i = sizenode(h);
- while (i--) {
- Node *n = gnode(h, i);
- lua_assert(ttype(gkey(n)) != LUA_TDEADKEY || ttisnil(gval(n)));
- if (ttisnil(gval(n)))
- removeentry(n); /* remove empty entries */
- else {
- lua_assert(!ttisnil(gkey(n)));
- if (!weakkey) markvalue(g, gkey(n));
- if (!weakvalue) markvalue(g, gval(n));
- }
- }
- return weakkey || weakvalue;
-}
-
-
-/*
-** All marks are conditional because a GC may happen while the
-** prototype is still being created
-*/
-static void traverseproto (global_State *g, Proto *f) {
- int i;
- if (f->source) stringmark(f->source);
- for (i=0; i<f->sizek; i++) /* mark literals */
- markvalue(g, &f->k[i]);
- for (i=0; i<f->sizeupvalues; i++) { /* mark upvalue names */
- if (f->upvalues[i])
- stringmark(f->upvalues[i]);
- }
- for (i=0; i<f->sizep; i++) { /* mark nested protos */
- if (f->p[i])
- markobject(g, f->p[i]);
- }
- for (i=0; i<f->sizelocvars; i++) { /* mark local-variable names */
- if (f->locvars[i].varname)
- stringmark(f->locvars[i].varname);
- }
-}
-
-
-
-static void traverseclosure (global_State *g, Closure *cl) {
- markobject(g, cl->c.env);
- if (cl->c.isC) {
- int i;
- for (i=0; i<cl->c.nupvalues; i++) /* mark its upvalues */
- markvalue(g, &cl->c.upvalue[i]);
- }
- else {
- int i;
- lua_assert(cl->l.nupvalues == cl->l.p->nups);
- markobject(g, cl->l.p);
- for (i=0; i<cl->l.nupvalues; i++) /* mark its upvalues */
- markobject(g, cl->l.upvals[i]);
- }
-}
-
-
-static void checkstacksizes (lua_State *L, StkId max) {
- int ci_used = cast_int(L->ci - L->base_ci); /* number of `ci' in use */
- int s_used = cast_int(max - L->stack); /* part of stack in use */
- if (L->size_ci > LUAI_MAXCALLS) /* handling overflow? */
- return; /* do not touch the stacks */
- if (4*ci_used < L->size_ci && 2*BASIC_CI_SIZE < L->size_ci)
- luaD_reallocCI(L, L->size_ci/2); /* still big enough... */
- condhardstacktests(luaD_reallocCI(L, ci_used + 1));
- if (4*s_used < L->stacksize &&
- 2*(BASIC_STACK_SIZE+EXTRA_STACK) < L->stacksize)
- luaD_reallocstack(L, L->stacksize/2); /* still big enough... */
- condhardstacktests(luaD_reallocstack(L, s_used));
-}
-
-
-static void traversestack (global_State *g, lua_State *l) {
- StkId o, lim;
- CallInfo *ci;
- markvalue(g, gt(l));
- lim = l->top;
- for (ci = l->base_ci; ci <= l->ci; ci++) {
- lua_assert(ci->top <= l->stack_last);
- if (lim < ci->top) lim = ci->top;
- }
- for (o = l->stack; o < l->top; o++)
- markvalue(g, o);
- for (; o <= lim; o++)
- setnilvalue(o);
- checkstacksizes(l, lim);
-}
-
-
-/*
-** traverse one gray object, turning it to black.
-** Returns `quantity' traversed.
-*/
-static l_mem propagatemark (global_State *g) {
- GCObject *o = g->gray;
- lua_assert(isgray(o));
- gray2black(o);
- switch (o->gch.tt) {
- case LUA_TTABLE: {
- Table *h = gco2h(o);
- g->gray = h->gclist;
- if (traversetable(g, h)) /* table is weak? */
- black2gray(o); /* keep it gray */
- return sizeof(Table) + sizeof(TValue) * h->sizearray +
- sizeof(Node) * sizenode(h);
- }
- case LUA_TFUNCTION: {
- Closure *cl = gco2cl(o);
- g->gray = cl->c.gclist;
- traverseclosure(g, cl);
- return (cl->c.isC) ? sizeCclosure(cl->c.nupvalues) :
- sizeLclosure(cl->l.nupvalues);
- }
- case LUA_TTHREAD: {
- lua_State *th = gco2th(o);
- g->gray = th->gclist;
- th->gclist = g->grayagain;
- g->grayagain = o;
- black2gray(o);
- traversestack(g, th);
- return sizeof(lua_State) + sizeof(TValue) * th->stacksize +
- sizeof(CallInfo) * th->size_ci;
- }
- case LUA_TPROTO: {
- Proto *p = gco2p(o);
- g->gray = p->gclist;
- traverseproto(g, p);
- return sizeof(Proto) + sizeof(Instruction) * p->sizecode +
- sizeof(Proto *) * p->sizep +
- sizeof(TValue) * p->sizek +
- sizeof(int) * p->sizelineinfo +
- sizeof(LocVar) * p->sizelocvars +
- sizeof(TString *) * p->sizeupvalues;
- }
- default: lua_assert(0); return 0;
- }
-}
-
-
-static size_t propagateall (global_State *g) {
- size_t m = 0;
- while (g->gray) m += propagatemark(g);
- return m;
-}
-
-
-/*
-** The next function tells whether a key or value can be cleared from
-** a weak table. Non-collectable objects are never removed from weak
-** tables. Strings behave as `values', so are never removed too. for
-** other objects: if really collected, cannot keep them; for userdata
-** being finalized, keep them in keys, but not in values
-*/
-static int iscleared (const TValue *o, int iskey) {
- if (!iscollectable(o)) return 0;
- if (ttisstring(o)) {
- stringmark(rawtsvalue(o)); /* strings are `values', so are never weak */
- return 0;
- }
- return iswhite(gcvalue(o)) ||
- (ttisuserdata(o) && (!iskey && isfinalized(uvalue(o))));
-}
-
-
-/*
-** clear collected entries from weaktables
-*/
-static void cleartable (GCObject *l) {
- while (l) {
- Table *h = gco2h(l);
- int i = h->sizearray;
- lua_assert(testbit(h->marked, VALUEWEAKBIT) ||
- testbit(h->marked, KEYWEAKBIT));
- if (testbit(h->marked, VALUEWEAKBIT)) {
- while (i--) {
- TValue *o = &h->array[i];
- if (iscleared(o, 0)) /* value was collected? */
- setnilvalue(o); /* remove value */
- }
- }
- i = sizenode(h);
- while (i--) {
- Node *n = gnode(h, i);
- if (!ttisnil(gval(n)) && /* non-empty entry? */
- (iscleared(key2tval(n), 1) || iscleared(gval(n), 0))) {
- setnilvalue(gval(n)); /* remove value ... */
- removeentry(n); /* remove entry from table */
- }
- }
- l = h->gclist;
- }
-}
-
-
-static void freeobj (lua_State *L, GCObject *o) {
- switch (o->gch.tt) {
- case LUA_TPROTO: luaF_freeproto(L, gco2p(o)); break;
- case LUA_TFUNCTION: luaF_freeclosure(L, gco2cl(o)); break;
- case LUA_TUPVAL: luaF_freeupval(L, gco2uv(o)); break;
- case LUA_TTABLE: luaH_free(L, gco2h(o)); break;
- case LUA_TTHREAD: {
- lua_assert(gco2th(o) != L && gco2th(o) != G(L)->mainthread);
- luaE_freethread(L, gco2th(o));
- break;
- }
- case LUA_TSTRING: {
- G(L)->strt.nuse--;
- luaM_freemem(L, o, sizestring(gco2ts(o)));
- break;
- }
- case LUA_TUSERDATA: {
- luaM_freemem(L, o, sizeudata(gco2u(o)));
- break;
- }
- default: lua_assert(0);
- }
-}
-
-
-
-#define sweepwholelist(L,p) sweeplist(L,p,MAX_LUMEM)
-
-
-static GCObject **sweeplist (lua_State *L, GCObject **p, lu_mem count) {
- GCObject *curr;
- global_State *g = G(L);
- int deadmask = otherwhite(g);
- while ((curr = *p) != NULL && count-- > 0) {
- if (curr->gch.tt == LUA_TTHREAD) /* sweep open upvalues of each thread */
- sweepwholelist(L, &gco2th(curr)->openupval);
- if ((curr->gch.marked ^ WHITEBITS) & deadmask) { /* not dead? */
- lua_assert(!isdead(g, curr) || testbit(curr->gch.marked, FIXEDBIT));
- makewhite(g, curr); /* make it white (for next cycle) */
- p = &curr->gch.next;
- }
- else { /* must erase `curr' */
- lua_assert(isdead(g, curr) || deadmask == bitmask(SFIXEDBIT));
- *p = curr->gch.next;
- if (curr == g->rootgc) /* is the first element of the list? */
- g->rootgc = curr->gch.next; /* adjust first */
- freeobj(L, curr);
- }
- }
- return p;
-}
-
-
-static void checkSizes (lua_State *L) {
- global_State *g = G(L);
- /* check size of string hash */
- if (g->strt.nuse < cast(lu_int32, g->strt.size/4) &&
- g->strt.size > MINSTRTABSIZE*2)
- luaS_resize(L, g->strt.size/2); /* table is too big */
- /* check size of buffer */
- if (luaZ_sizebuffer(&g->buff) > LUA_MINBUFFER*2) { /* buffer too big? */
- size_t newsize = luaZ_sizebuffer(&g->buff) / 2;
- luaZ_resizebuffer(L, &g->buff, newsize);
- }
-}
-
-
-static void GCTM (lua_State *L) {
- global_State *g = G(L);
- GCObject *o = g->tmudata->gch.next; /* get first element */
- Udata *udata = rawgco2u(o);
- const TValue *tm;
- /* remove udata from `tmudata' */
- if (o == g->tmudata) /* last element? */
- g->tmudata = NULL;
- else
- g->tmudata->gch.next = udata->uv.next;
- udata->uv.next = g->mainthread->next; /* return it to `root' list */
- g->mainthread->next = o;
- makewhite(g, o);
- tm = fasttm(L, udata->uv.metatable, TM_GC);
- if (tm != NULL) {
- lu_byte oldah = L->allowhook;
- lu_mem oldt = g->GCthreshold;
- L->allowhook = 0; /* stop debug hooks during GC tag method */
- g->GCthreshold = 2*g->totalbytes; /* avoid GC steps */
- setobj2s(L, L->top, tm);
- setuvalue(L, L->top+1, udata);
- L->top += 2;
- luaD_call(L, L->top - 2, 0);
- L->allowhook = oldah; /* restore hooks */
- g->GCthreshold = oldt; /* restore threshold */
- }
-}
-
-
-/*
-** Call all GC tag methods
-*/
-void luaC_callGCTM (lua_State *L) {
- while (G(L)->tmudata)
- GCTM(L);
-}
-
-
-void luaC_freeall (lua_State *L) {
- global_State *g = G(L);
- int i;
- g->currentwhite = WHITEBITS | bitmask(SFIXEDBIT); /* mask to collect all elements */
- sweepwholelist(L, &g->rootgc);
- for (i = 0; i < g->strt.size; i++) /* free all string lists */
- sweepwholelist(L, &g->strt.hash[i]);
-}
-
-
-static void markmt (global_State *g) {
- int i;
- for (i=0; i<NUM_TAGS; i++)
- if (g->mt[i]) markobject(g, g->mt[i]);
-}
-
-
-/* mark root set */
-static void markroot (lua_State *L) {
- global_State *g = G(L);
- g->gray = NULL;
- g->grayagain = NULL;
- g->weak = NULL;
- markobject(g, g->mainthread);
- /* make global table be traversed before main stack */
- markvalue(g, gt(g->mainthread));
- markvalue(g, registry(L));
- markmt(g);
- g->gcstate = GCSpropagate;
-}
-
-
-static void remarkupvals (global_State *g) {
- UpVal *uv;
- for (uv = g->uvhead.u.l.next; uv != &g->uvhead; uv = uv->u.l.next) {
- lua_assert(uv->u.l.next->u.l.prev == uv && uv->u.l.prev->u.l.next == uv);
- if (isgray(obj2gco(uv)))
- markvalue(g, uv->v);
- }
-}
-
-
-static void atomic (lua_State *L) {
- global_State *g = G(L);
- size_t udsize; /* total size of userdata to be finalized */
- /* remark occasional upvalues of (maybe) dead threads */
- remarkupvals(g);
- /* traverse objects cautch by write barrier and by 'remarkupvals' */
- propagateall(g);
- /* remark weak tables */
- g->gray = g->weak;
- g->weak = NULL;
- lua_assert(!iswhite(obj2gco(g->mainthread)));
- markobject(g, L); /* mark running thread */
- markmt(g); /* mark basic metatables (again) */
- propagateall(g);
- /* remark gray again */
- g->gray = g->grayagain;
- g->grayagain = NULL;
- propagateall(g);
- udsize = luaC_separateudata(L, 0); /* separate userdata to be finalized */
- marktmu(g); /* mark `preserved' userdata */
- udsize += propagateall(g); /* remark, to propagate `preserveness' */
- cleartable(g->weak); /* remove collected objects from weak tables */
- /* flip current white */
- g->currentwhite = cast_byte(otherwhite(g));
- g->sweepstrgc = 0;
- g->sweepgc = &g->rootgc;
- g->gcstate = GCSsweepstring;
- g->estimate = g->totalbytes - udsize; /* first estimate */
-}
-
-
-static l_mem singlestep (lua_State *L) {
- global_State *g = G(L);
- /*lua_checkmemory(L);*/
- switch (g->gcstate) {
- case GCSpause: {
- markroot(L); /* start a new collection */
- return 0;
- }
- case GCSpropagate: {
- if (g->gray)
- return propagatemark(g);
- else { /* no more `gray' objects */
- atomic(L); /* finish mark phase */
- return 0;
- }
- }
- case GCSsweepstring: {
- lu_mem old = g->totalbytes;
- sweepwholelist(L, &g->strt.hash[g->sweepstrgc++]);
- if (g->sweepstrgc >= g->strt.size) /* nothing more to sweep? */
- g->gcstate = GCSsweep; /* end sweep-string phase */
- lua_assert(old >= g->totalbytes);
- g->estimate -= old - g->totalbytes;
- return GCSWEEPCOST;
- }
- case GCSsweep: {
- lu_mem old = g->totalbytes;
- g->sweepgc = sweeplist(L, g->sweepgc, GCSWEEPMAX);
- if (*g->sweepgc == NULL) { /* nothing more to sweep? */
- checkSizes(L);
- g->gcstate = GCSfinalize; /* end sweep phase */
- }
- lua_assert(old >= g->totalbytes);
- g->estimate -= old - g->totalbytes;
- return GCSWEEPMAX*GCSWEEPCOST;
- }
- case GCSfinalize: {
- if (g->tmudata) {
- GCTM(L);
- if (g->estimate > GCFINALIZECOST)
- g->estimate -= GCFINALIZECOST;
- return GCFINALIZECOST;
- }
- else {
- g->gcstate = GCSpause; /* end collection */
- g->gcdept = 0;
- return 0;
- }
- }
- default: lua_assert(0); return 0;
- }
-}
-
-
-void luaC_step (lua_State *L) {
- global_State *g = G(L);
- l_mem lim = (GCSTEPSIZE/100) * g->gcstepmul;
- if (lim == 0)
- lim = (MAX_LUMEM-1)/2; /* no limit */
- g->gcdept += g->totalbytes - g->GCthreshold;
- do {
- lim -= singlestep(L);
- if (g->gcstate == GCSpause)
- break;
- } while (lim > 0);
- if (g->gcstate != GCSpause) {
- if (g->gcdept < GCSTEPSIZE)
- g->GCthreshold = g->totalbytes + GCSTEPSIZE; /* - lim/g->gcstepmul;*/
- else {
- g->gcdept -= GCSTEPSIZE;
- g->GCthreshold = g->totalbytes;
- }
- }
- else {
- lua_assert(g->totalbytes >= g->estimate);
- setthreshold(g);
- }
-}
-
-
-void luaC_fullgc (lua_State *L) {
- global_State *g = G(L);
- if (g->gcstate <= GCSpropagate) {
- /* reset sweep marks to sweep all elements (returning them to white) */
- g->sweepstrgc = 0;
- g->sweepgc = &g->rootgc;
- /* reset other collector lists */
- g->gray = NULL;
- g->grayagain = NULL;
- g->weak = NULL;
- g->gcstate = GCSsweepstring;
- }
- lua_assert(g->gcstate != GCSpause && g->gcstate != GCSpropagate);
- /* finish any pending sweep phase */
- while (g->gcstate != GCSfinalize) {
- lua_assert(g->gcstate == GCSsweepstring || g->gcstate == GCSsweep);
- singlestep(L);
- }
- markroot(L);
- while (g->gcstate != GCSpause) {
- singlestep(L);
- }
- setthreshold(g);
-}
-
-
-void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v) {
- global_State *g = G(L);
- lua_assert(isblack(o) && iswhite(v) && !isdead(g, v) && !isdead(g, o));
- lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
- lua_assert(ttype(&o->gch) != LUA_TTABLE);
- /* must keep invariant? */
- if (g->gcstate == GCSpropagate)
- reallymarkobject(g, v); /* restore invariant */
- else /* don't mind */
- makewhite(g, o); /* mark as white just to avoid other barriers */
-}
-
-
-void luaC_barrierback (lua_State *L, Table *t) {
- global_State *g = G(L);
- GCObject *o = obj2gco(t);
- lua_assert(isblack(o) && !isdead(g, o));
- lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
- black2gray(o); /* make table gray (again) */
- t->gclist = g->grayagain;
- g->grayagain = o;
-}
-
-
-void luaC_link (lua_State *L, GCObject *o, lu_byte tt) {
- global_State *g = G(L);
- o->gch.next = g->rootgc;
- g->rootgc = o;
- o->gch.marked = luaC_white(g);
- o->gch.tt = tt;
-}
-
-
-void luaC_linkupval (lua_State *L, UpVal *uv) {
- global_State *g = G(L);
- GCObject *o = obj2gco(uv);
- o->gch.next = g->rootgc; /* link upvalue into `rootgc' list */
- g->rootgc = o;
- if (isgray(o)) {
- if (g->gcstate == GCSpropagate) {
- gray2black(o); /* closed upvalues need barrier */
- luaC_barrier(L, uv, uv->v);
- }
- else { /* sweep phase: sweep it (turning it into white) */
- makewhite(g, o);
- lua_assert(g->gcstate != GCSfinalize && g->gcstate != GCSpause);
- }
- }
-}
+++ /dev/null
-/*
-** $Id: lgc.h,v 2.15.1.1 2007/12/27 13:02:25 roberto Exp $
-** Garbage Collector
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lgc_h
-#define lgc_h
-
-
-#include "lobject.h"
-
-
-/*
-** Possible states of the Garbage Collector
-*/
-#define GCSpause 0
-#define GCSpropagate 1
-#define GCSsweepstring 2
-#define GCSsweep 3
-#define GCSfinalize 4
-
-
-/*
-** some userful bit tricks
-*/
-#define resetbits(x,m) ((x) &= cast(lu_byte, ~(m)))
-#define setbits(x,m) ((x) |= (m))
-#define testbits(x,m) ((x) & (m))
-#define bitmask(b) (1<<(b))
-#define bit2mask(b1,b2) (bitmask(b1) | bitmask(b2))
-#define l_setbit(x,b) setbits(x, bitmask(b))
-#define resetbit(x,b) resetbits(x, bitmask(b))
-#define testbit(x,b) testbits(x, bitmask(b))
-#define set2bits(x,b1,b2) setbits(x, (bit2mask(b1, b2)))
-#define reset2bits(x,b1,b2) resetbits(x, (bit2mask(b1, b2)))
-#define test2bits(x,b1,b2) testbits(x, (bit2mask(b1, b2)))
-
-
-
-/*
-** Layout for bit use in `marked' field:
-** bit 0 - object is white (type 0)
-** bit 1 - object is white (type 1)
-** bit 2 - object is black
-** bit 3 - for userdata: has been finalized
-** bit 3 - for tables: has weak keys
-** bit 4 - for tables: has weak values
-** bit 5 - object is fixed (should not be collected)
-** bit 6 - object is "super" fixed (only the main thread)
-*/
-
-
-#define WHITE0BIT 0
-#define WHITE1BIT 1
-#define BLACKBIT 2
-#define FINALIZEDBIT 3
-#define KEYWEAKBIT 3
-#define VALUEWEAKBIT 4
-#define FIXEDBIT 5
-#define SFIXEDBIT 6
-#define WHITEBITS bit2mask(WHITE0BIT, WHITE1BIT)
-
-
-#define iswhite(x) test2bits((x)->gch.marked, WHITE0BIT, WHITE1BIT)
-#define isblack(x) testbit((x)->gch.marked, BLACKBIT)
-#define isgray(x) (!isblack(x) && !iswhite(x))
-
-#define otherwhite(g) (g->currentwhite ^ WHITEBITS)
-#define isdead(g,v) ((v)->gch.marked & otherwhite(g) & WHITEBITS)
-
-#define changewhite(x) ((x)->gch.marked ^= WHITEBITS)
-#define gray2black(x) l_setbit((x)->gch.marked, BLACKBIT)
-
-#define valiswhite(x) (iscollectable(x) && iswhite(gcvalue(x)))
-
-#define luaC_white(g) cast(lu_byte, (g)->currentwhite & WHITEBITS)
-
-
-#define luaC_checkGC(L) { \
- condhardstacktests(luaD_reallocstack(L, L->stacksize - EXTRA_STACK - 1)); \
- if (G(L)->totalbytes >= G(L)->GCthreshold) \
- luaC_step(L); }
-
-
-#define luaC_barrier(L,p,v) { if (valiswhite(v) && isblack(obj2gco(p))) \
- luaC_barrierf(L,obj2gco(p),gcvalue(v)); }
-
-#define luaC_barriert(L,t,v) { if (valiswhite(v) && isblack(obj2gco(t))) \
- luaC_barrierback(L,t); }
-
-#define luaC_objbarrier(L,p,o) \
- { if (iswhite(obj2gco(o)) && isblack(obj2gco(p))) \
- luaC_barrierf(L,obj2gco(p),obj2gco(o)); }
-
-#define luaC_objbarriert(L,t,o) \
- { if (iswhite(obj2gco(o)) && isblack(obj2gco(t))) luaC_barrierback(L,t); }
-
-LUAI_FUNC size_t luaC_separateudata (lua_State *L, int all);
-LUAI_FUNC void luaC_callGCTM (lua_State *L);
-LUAI_FUNC void luaC_freeall (lua_State *L);
-LUAI_FUNC void luaC_step (lua_State *L);
-LUAI_FUNC void luaC_fullgc (lua_State *L);
-LUAI_FUNC void luaC_link (lua_State *L, GCObject *o, lu_byte tt);
-LUAI_FUNC void luaC_linkupval (lua_State *L, UpVal *uv);
-LUAI_FUNC void luaC_barrierf (lua_State *L, GCObject *o, GCObject *v);
-LUAI_FUNC void luaC_barrierback (lua_State *L, Table *t);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: linit.c,v 1.14.1.1 2007/12/27 13:02:25 roberto Exp $
-** Initialization of libraries for lua.c
-** See Copyright Notice in lua.h
-*/
-
-
-#define linit_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lualib.h"
-#include "lauxlib.h"
-
-
-static const luaL_Reg lualibs[] = {
- {"", luaopen_base},
- {LUA_LOADLIBNAME, luaopen_package},
- {LUA_TABLIBNAME, luaopen_table},
- {LUA_IOLIBNAME, luaopen_io},
- {LUA_OSLIBNAME, luaopen_os},
- {LUA_STRLIBNAME, luaopen_string},
- {LUA_MATHLIBNAME, luaopen_math},
- {LUA_DBLIBNAME, luaopen_debug},
- {NULL, NULL}
-};
-
-
-LUALIB_API void luaL_openlibs (lua_State *L) {
- const luaL_Reg *lib = lualibs;
- for (; lib->func; lib++) {
- lua_pushcfunction(L, lib->func);
- lua_pushstring(L, lib->name);
- lua_call(L, 1, 0);
- }
-}
+++ /dev/null
-/*
-** $Id: liolib.c,v 2.73.1.3 2008/01/18 17:47:43 roberto Exp $
-** Standard I/O (and system) library
-** See Copyright Notice in lua.h
-*/
-
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define liolib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-#define IO_INPUT 1
-#define IO_OUTPUT 2
-
-
-static const char *const fnames[] = {"input", "output"};
-
-
-static int pushresult (lua_State *L, int i, const char *filename) {
- int en = errno; /* calls to Lua API may change this value */
- if (i) {
- lua_pushboolean(L, 1);
- return 1;
- }
- else {
- lua_pushnil(L);
- if (filename)
- lua_pushfstring(L, "%s: %s", filename, strerror(en));
- else
- lua_pushfstring(L, "%s", strerror(en));
- lua_pushinteger(L, en);
- return 3;
- }
-}
-
-
-static void fileerror (lua_State *L, int arg, const char *filename) {
- lua_pushfstring(L, "%s: %s", filename, strerror(errno));
- luaL_argerror(L, arg, lua_tostring(L, -1));
-}
-
-
-#define tofilep(L) ((FILE **)luaL_checkudata(L, 1, LUA_FILEHANDLE))
-
-
-static int io_type (lua_State *L) {
- void *ud;
- luaL_checkany(L, 1);
- ud = lua_touserdata(L, 1);
- lua_getfield(L, LUA_REGISTRYINDEX, LUA_FILEHANDLE);
- if (ud == NULL || !lua_getmetatable(L, 1) || !lua_rawequal(L, -2, -1))
- lua_pushnil(L); /* not a file */
- else if (*((FILE **)ud) == NULL)
- lua_pushliteral(L, "closed file");
- else
- lua_pushliteral(L, "file");
- return 1;
-}
-
-
-static FILE *tofile (lua_State *L) {
- FILE **f = tofilep(L);
- if (*f == NULL)
- luaL_error(L, "attempt to use a closed file");
- return *f;
-}
-
-
-
-/*
-** When creating file handles, always creates a `closed' file handle
-** before opening the actual file; so, if there is a memory error, the
-** file is not left opened.
-*/
-static FILE **newfile (lua_State *L) {
- FILE **pf = (FILE **)lua_newuserdata(L, sizeof(FILE *));
- *pf = NULL; /* file handle is currently `closed' */
- luaL_getmetatable(L, LUA_FILEHANDLE);
- lua_setmetatable(L, -2);
- return pf;
-}
-
-
-/*
-** function to (not) close the standard files stdin, stdout, and stderr
-*/
-static int io_noclose (lua_State *L) {
- lua_pushnil(L);
- lua_pushliteral(L, "cannot close standard file");
- return 2;
-}
-
-
-/*
-** function to close 'popen' files
-*/
-static int io_pclose (lua_State *L) {
- FILE **p = tofilep(L);
- int ok = lua_pclose(L, *p);
- *p = NULL;
- return pushresult(L, ok, NULL);
-}
-
-
-/*
-** function to close regular files
-*/
-static int io_fclose (lua_State *L) {
- FILE **p = tofilep(L);
- int ok = (fclose(*p) == 0);
- *p = NULL;
- return pushresult(L, ok, NULL);
-}
-
-
-static int aux_close (lua_State *L) {
- lua_getfenv(L, 1);
- lua_getfield(L, -1, "__close");
- return (lua_tocfunction(L, -1))(L);
-}
-
-
-static int io_close (lua_State *L) {
- if (lua_isnone(L, 1))
- lua_rawgeti(L, LUA_ENVIRONINDEX, IO_OUTPUT);
- tofile(L); /* make sure argument is a file */
- return aux_close(L);
-}
-
-
-static int io_gc (lua_State *L) {
- FILE *f = *tofilep(L);
- /* ignore closed files */
- if (f != NULL)
- aux_close(L);
- return 0;
-}
-
-
-static int io_tostring (lua_State *L) {
- FILE *f = *tofilep(L);
- if (f == NULL)
- lua_pushliteral(L, "file (closed)");
- else
- lua_pushfstring(L, "file (%p)", f);
- return 1;
-}
-
-
-static int io_open (lua_State *L) {
- const char *filename = luaL_checkstring(L, 1);
- const char *mode = luaL_optstring(L, 2, "r");
- FILE **pf = newfile(L);
- *pf = fopen(filename, mode);
- return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
-}
-
-
-/*
-** this function has a separated environment, which defines the
-** correct __close for 'popen' files
-*/
-static int io_popen (lua_State *L) {
- const char *filename = luaL_checkstring(L, 1);
- const char *mode = luaL_optstring(L, 2, "r");
- FILE **pf = newfile(L);
- *pf = lua_popen(L, filename, mode);
- return (*pf == NULL) ? pushresult(L, 0, filename) : 1;
-}
-
-
-static int io_tmpfile (lua_State *L) {
- FILE **pf = newfile(L);
- *pf = tmpfile();
- return (*pf == NULL) ? pushresult(L, 0, NULL) : 1;
-}
-
-
-static FILE *getiofile (lua_State *L, int findex) {
- FILE *f;
- lua_rawgeti(L, LUA_ENVIRONINDEX, findex);
- f = *(FILE **)lua_touserdata(L, -1);
- if (f == NULL)
- luaL_error(L, "standard %s file is closed", fnames[findex - 1]);
- return f;
-}
-
-
-static int g_iofile (lua_State *L, int f, const char *mode) {
- if (!lua_isnoneornil(L, 1)) {
- const char *filename = lua_tostring(L, 1);
- if (filename) {
- FILE **pf = newfile(L);
- *pf = fopen(filename, mode);
- if (*pf == NULL)
- fileerror(L, 1, filename);
- }
- else {
- tofile(L); /* check that it's a valid file handle */
- lua_pushvalue(L, 1);
- }
- lua_rawseti(L, LUA_ENVIRONINDEX, f);
- }
- /* return current value */
- lua_rawgeti(L, LUA_ENVIRONINDEX, f);
- return 1;
-}
-
-
-static int io_input (lua_State *L) {
- return g_iofile(L, IO_INPUT, "r");
-}
-
-
-static int io_output (lua_State *L) {
- return g_iofile(L, IO_OUTPUT, "w");
-}
-
-
-static int io_readline (lua_State *L);
-
-
-static void aux_lines (lua_State *L, int idx, int toclose) {
- lua_pushvalue(L, idx);
- lua_pushboolean(L, toclose); /* close/not close file when finished */
- lua_pushcclosure(L, io_readline, 2);
-}
-
-
-static int f_lines (lua_State *L) {
- tofile(L); /* check that it's a valid file handle */
- aux_lines(L, 1, 0);
- return 1;
-}
-
-
-static int io_lines (lua_State *L) {
- if (lua_isnoneornil(L, 1)) { /* no arguments? */
- /* will iterate over default input */
- lua_rawgeti(L, LUA_ENVIRONINDEX, IO_INPUT);
- return f_lines(L);
- }
- else {
- const char *filename = luaL_checkstring(L, 1);
- FILE **pf = newfile(L);
- *pf = fopen(filename, "r");
- if (*pf == NULL)
- fileerror(L, 1, filename);
- aux_lines(L, lua_gettop(L), 1);
- return 1;
- }
-}
-
-
-/*
-** {======================================================
-** READ
-** =======================================================
-*/
-
-
-static int read_number (lua_State *L, FILE *f) {
- lua_Number d;
- if (fscanf(f, LUA_NUMBER_SCAN, &d) == 1) {
- lua_pushnumber(L, d);
- return 1;
- }
- else return 0; /* read fails */
-}
-
-
-static int test_eof (lua_State *L, FILE *f) {
- int c = getc(f);
- ungetc(c, f);
- lua_pushlstring(L, NULL, 0);
- return (c != EOF);
-}
-
-
-static int read_line (lua_State *L, FILE *f) {
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- for (;;) {
- size_t l;
- char *p = luaL_prepbuffer(&b);
- if (fgets(p, LUAL_BUFFERSIZE, f) == NULL) { /* eof? */
- luaL_pushresult(&b); /* close buffer */
- return (lua_objlen(L, -1) > 0); /* check whether read something */
- }
- l = strlen(p);
- if (l == 0 || p[l-1] != '\n')
- luaL_addsize(&b, l);
- else {
- luaL_addsize(&b, l - 1); /* do not include `eol' */
- luaL_pushresult(&b); /* close buffer */
- return 1; /* read at least an `eol' */
- }
- }
-}
-
-
-static int read_chars (lua_State *L, FILE *f, size_t n) {
- size_t rlen; /* how much to read */
- size_t nr; /* number of chars actually read */
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- rlen = LUAL_BUFFERSIZE; /* try to read that much each time */
- do {
- char *p = luaL_prepbuffer(&b);
- if (rlen > n) rlen = n; /* cannot read more than asked */
- nr = fread(p, sizeof(char), rlen, f);
- luaL_addsize(&b, nr);
- n -= nr; /* still have to read `n' chars */
- } while (n > 0 && nr == rlen); /* until end of count or eof */
- luaL_pushresult(&b); /* close buffer */
- return (n == 0 || lua_objlen(L, -1) > 0);
-}
-
-
-static int g_read (lua_State *L, FILE *f, int first) {
- int nargs = lua_gettop(L) - 1;
- int success;
- int n;
- clearerr(f);
- if (nargs == 0) { /* no arguments? */
- success = read_line(L, f);
- n = first+1; /* to return 1 result */
- }
- else { /* ensure stack space for all results and for auxlib's buffer */
- luaL_checkstack(L, nargs+LUA_MINSTACK, "too many arguments");
- success = 1;
- for (n = first; nargs-- && success; n++) {
- if (lua_type(L, n) == LUA_TNUMBER) {
- size_t l = (size_t)lua_tointeger(L, n);
- success = (l == 0) ? test_eof(L, f) : read_chars(L, f, l);
- }
- else {
- const char *p = lua_tostring(L, n);
- luaL_argcheck(L, p && p[0] == '*', n, "invalid option");
- switch (p[1]) {
- case 'n': /* number */
- success = read_number(L, f);
- break;
- case 'l': /* line */
- success = read_line(L, f);
- break;
- case 'a': /* file */
- read_chars(L, f, ~((size_t)0)); /* read MAX_SIZE_T chars */
- success = 1; /* always success */
- break;
- default:
- return luaL_argerror(L, n, "invalid format");
- }
- }
- }
- }
- if (ferror(f))
- return pushresult(L, 0, NULL);
- if (!success) {
- lua_pop(L, 1); /* remove last result */
- lua_pushnil(L); /* push nil instead */
- }
- return n - first;
-}
-
-
-static int io_read (lua_State *L) {
- return g_read(L, getiofile(L, IO_INPUT), 1);
-}
-
-
-static int f_read (lua_State *L) {
- return g_read(L, tofile(L), 2);
-}
-
-
-static int io_readline (lua_State *L) {
- FILE *f = *(FILE **)lua_touserdata(L, lua_upvalueindex(1));
- int sucess;
- if (f == NULL) /* file is already closed? */
- luaL_error(L, "file is already closed");
- sucess = read_line(L, f);
- if (ferror(f))
- return luaL_error(L, "%s", strerror(errno));
- if (sucess) return 1;
- else { /* EOF */
- if (lua_toboolean(L, lua_upvalueindex(2))) { /* generator created file? */
- lua_settop(L, 0);
- lua_pushvalue(L, lua_upvalueindex(1));
- aux_close(L); /* close it */
- }
- return 0;
- }
-}
-
-/* }====================================================== */
-
-
-static int g_write (lua_State *L, FILE *f, int arg) {
- int nargs = lua_gettop(L) - 1;
- int status = 1;
- for (; nargs--; arg++) {
- if (lua_type(L, arg) == LUA_TNUMBER) {
- /* optimization: could be done exactly as for strings */
- status = status &&
- fprintf(f, LUA_NUMBER_FMT, lua_tonumber(L, arg)) > 0;
- }
- else {
- size_t l;
- const char *s = luaL_checklstring(L, arg, &l);
- status = status && (fwrite(s, sizeof(char), l, f) == l);
- }
- }
- return pushresult(L, status, NULL);
-}
-
-
-static int io_write (lua_State *L) {
- return g_write(L, getiofile(L, IO_OUTPUT), 1);
-}
-
-
-static int f_write (lua_State *L) {
- return g_write(L, tofile(L), 2);
-}
-
-
-static int f_seek (lua_State *L) {
- static const int mode[] = {SEEK_SET, SEEK_CUR, SEEK_END};
- static const char *const modenames[] = {"set", "cur", "end", NULL};
- FILE *f = tofile(L);
- int op = luaL_checkoption(L, 2, "cur", modenames);
- long offset = luaL_optlong(L, 3, 0);
- op = fseek(f, offset, mode[op]);
- if (op)
- return pushresult(L, 0, NULL); /* error */
- else {
- lua_pushinteger(L, ftell(f));
- return 1;
- }
-}
-
-
-static int f_setvbuf (lua_State *L) {
- static const int mode[] = {_IONBF, _IOFBF, _IOLBF};
- static const char *const modenames[] = {"no", "full", "line", NULL};
- FILE *f = tofile(L);
- int op = luaL_checkoption(L, 2, NULL, modenames);
- lua_Integer sz = luaL_optinteger(L, 3, LUAL_BUFFERSIZE);
- int res = setvbuf(f, NULL, mode[op], sz);
- return pushresult(L, res == 0, NULL);
-}
-
-
-
-static int io_flush (lua_State *L) {
- return pushresult(L, fflush(getiofile(L, IO_OUTPUT)) == 0, NULL);
-}
-
-
-static int f_flush (lua_State *L) {
- return pushresult(L, fflush(tofile(L)) == 0, NULL);
-}
-
-
-static const luaL_Reg iolib[] = {
- {"close", io_close},
- {"flush", io_flush},
- {"input", io_input},
- {"lines", io_lines},
- {"open", io_open},
- {"output", io_output},
- {"popen", io_popen},
- {"read", io_read},
- {"tmpfile", io_tmpfile},
- {"type", io_type},
- {"write", io_write},
- {NULL, NULL}
-};
-
-
-static const luaL_Reg flib[] = {
- {"close", io_close},
- {"flush", f_flush},
- {"lines", f_lines},
- {"read", f_read},
- {"seek", f_seek},
- {"setvbuf", f_setvbuf},
- {"write", f_write},
- {"__gc", io_gc},
- {"__tostring", io_tostring},
- {NULL, NULL}
-};
-
-
-static void createmeta (lua_State *L) {
- luaL_newmetatable(L, LUA_FILEHANDLE); /* create metatable for file handles */
- lua_pushvalue(L, -1); /* push metatable */
- lua_setfield(L, -2, "__index"); /* metatable.__index = metatable */
- luaL_register(L, NULL, flib); /* file methods */
-}
-
-
-static void createstdfile (lua_State *L, FILE *f, int k, const char *fname) {
- *newfile(L) = f;
- if (k > 0) {
- lua_pushvalue(L, -1);
- lua_rawseti(L, LUA_ENVIRONINDEX, k);
- }
- lua_pushvalue(L, -2); /* copy environment */
- lua_setfenv(L, -2); /* set it */
- lua_setfield(L, -3, fname);
-}
-
-
-static void newfenv (lua_State *L, lua_CFunction cls) {
- lua_createtable(L, 0, 1);
- lua_pushcfunction(L, cls);
- lua_setfield(L, -2, "__close");
-}
-
-
-LUALIB_API int luaopen_io (lua_State *L) {
- createmeta(L);
- /* create (private) environment (with fields IO_INPUT, IO_OUTPUT, __close) */
- newfenv(L, io_fclose);
- lua_replace(L, LUA_ENVIRONINDEX);
- /* open library */
- luaL_register(L, LUA_IOLIBNAME, iolib);
- /* create (and set) default files */
- newfenv(L, io_noclose); /* close function for default files */
- createstdfile(L, stdin, IO_INPUT, "stdin");
- createstdfile(L, stdout, IO_OUTPUT, "stdout");
- createstdfile(L, stderr, 0, "stderr");
- lua_pop(L, 1); /* pop environment for default files */
- lua_getfield(L, -1, "popen");
- newfenv(L, io_pclose); /* create environment for 'popen' */
- lua_setfenv(L, -2); /* set fenv for 'popen' */
- lua_pop(L, 1); /* pop 'popen' */
- return 1;
-}
+++ /dev/null
-/*
-** $Id: llex.c,v 2.20.1.1 2007/12/27 13:02:25 roberto Exp $
-** Lexical Analyzer
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <locale.h>
-#include <string.h>
-
-#define llex_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldo.h"
-#include "llex.h"
-#include "lobject.h"
-#include "lparser.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "lzio.h"
-
-
-
-#define next(ls) (ls->current = zgetc(ls->z))
-
-
-
-
-#define currIsNewline(ls) (ls->current == '\n' || ls->current == '\r')
-
-
-/* ORDER RESERVED */
-const char *const luaX_tokens [] = {
- "and", "break", "do", "else", "elseif",
- "end", "false", "for", "function", "if",
- "in", "local", "nil", "not", "or", "repeat",
- "return", "then", "true", "until", "while",
- "..", "...", "==", ">=", "<=", "~=",
- "<number>", "<name>", "<string>", "<eof>",
- NULL
-};
-
-
-#define save_and_next(ls) (save(ls, ls->current), next(ls))
-
-
-static void save (LexState *ls, int c) {
- Mbuffer *b = ls->buff;
- if (b->n + 1 > b->buffsize) {
- size_t newsize;
- if (b->buffsize >= MAX_SIZET/2)
- luaX_lexerror(ls, "lexical element too long", 0);
- newsize = b->buffsize * 2;
- luaZ_resizebuffer(ls->L, b, newsize);
- }
- b->buffer[b->n++] = cast(char, c);
-}
-
-
-void luaX_init (lua_State *L) {
- int i;
- for (i=0; i<NUM_RESERVED; i++) {
- TString *ts = luaS_new(L, luaX_tokens[i]);
- luaS_fix(ts); /* reserved words are never collected */
- lua_assert(strlen(luaX_tokens[i])+1 <= TOKEN_LEN);
- ts->tsv.reserved = cast_byte(i+1); /* reserved word */
- }
-}
-
-
-#define MAXSRC 80
-
-
-const char *luaX_token2str (LexState *ls, int token) {
- if (token < FIRST_RESERVED) {
- lua_assert(token == cast(unsigned char, token));
- return (iscntrl(token)) ? luaO_pushfstring(ls->L, "char(%d)", token) :
- luaO_pushfstring(ls->L, "%c", token);
- }
- else
- return luaX_tokens[token-FIRST_RESERVED];
-}
-
-
-static const char *txtToken (LexState *ls, int token) {
- switch (token) {
- case TK_NAME:
- case TK_STRING:
- case TK_NUMBER:
- save(ls, '\0');
- return luaZ_buffer(ls->buff);
- default:
- return luaX_token2str(ls, token);
- }
-}
-
-
-void luaX_lexerror (LexState *ls, const char *msg, int token) {
- char buff[MAXSRC];
- luaO_chunkid(buff, getstr(ls->source), MAXSRC);
- msg = luaO_pushfstring(ls->L, "%s:%d: %s", buff, ls->linenumber, msg);
- if (token)
- luaO_pushfstring(ls->L, "%s near " LUA_QS, msg, txtToken(ls, token));
- luaD_throw(ls->L, LUA_ERRSYNTAX);
-}
-
-
-void luaX_syntaxerror (LexState *ls, const char *msg) {
- luaX_lexerror(ls, msg, ls->t.token);
-}
-
-
-TString *luaX_newstring (LexState *ls, const char *str, size_t l) {
- lua_State *L = ls->L;
- TString *ts = luaS_newlstr(L, str, l);
- TValue *o = luaH_setstr(L, ls->fs->h, ts); /* entry for `str' */
- if (ttisnil(o))
- setbvalue(o, 1); /* make sure `str' will not be collected */
- return ts;
-}
-
-
-static void inclinenumber (LexState *ls) {
- int old = ls->current;
- lua_assert(currIsNewline(ls));
- next(ls); /* skip `\n' or `\r' */
- if (currIsNewline(ls) && ls->current != old)
- next(ls); /* skip `\n\r' or `\r\n' */
- if (++ls->linenumber >= MAX_INT)
- luaX_syntaxerror(ls, "chunk has too many lines");
-}
-
-
-void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source) {
- ls->decpoint = '.';
- ls->L = L;
- ls->lookahead.token = TK_EOS; /* no look-ahead token */
- ls->z = z;
- ls->fs = NULL;
- ls->linenumber = 1;
- ls->lastline = 1;
- ls->source = source;
- luaZ_resizebuffer(ls->L, ls->buff, LUA_MINBUFFER); /* initialize buffer */
- next(ls); /* read first char */
-}
-
-
-
-/*
-** =======================================================
-** LEXICAL ANALYZER
-** =======================================================
-*/
-
-
-
-static int check_next (LexState *ls, const char *set) {
- if (!strchr(set, ls->current))
- return 0;
- save_and_next(ls);
- return 1;
-}
-
-
-static void buffreplace (LexState *ls, char from, char to) {
- size_t n = luaZ_bufflen(ls->buff);
- char *p = luaZ_buffer(ls->buff);
- while (n--)
- if (p[n] == from) p[n] = to;
-}
-
-
-static void trydecpoint (LexState *ls, SemInfo *seminfo) {
- /* format error: try to update decimal point separator */
- struct lconv *cv = localeconv();
- char old = ls->decpoint;
- ls->decpoint = (cv ? cv->decimal_point[0] : '.');
- buffreplace(ls, old, ls->decpoint); /* try updated decimal separator */
- if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) {
- /* format error with correct decimal point: no more options */
- buffreplace(ls, ls->decpoint, '.'); /* undo change (for error message) */
- luaX_lexerror(ls, "malformed number", TK_NUMBER);
- }
-}
-
-
-/* LUA_NUMBER */
-static void read_numeral (LexState *ls, SemInfo *seminfo) {
- lua_assert(isdigit(ls->current));
- do {
- save_and_next(ls);
- } while (isdigit(ls->current) || ls->current == '.');
- if (check_next(ls, "Ee")) /* `E'? */
- check_next(ls, "+-"); /* optional exponent sign */
- while (isalnum(ls->current) || ls->current == '_')
- save_and_next(ls);
- save(ls, '\0');
- buffreplace(ls, '.', ls->decpoint); /* follow locale for decimal point */
- if (!luaO_str2d(luaZ_buffer(ls->buff), &seminfo->r)) /* format error? */
- trydecpoint(ls, seminfo); /* try to update decimal point separator */
-}
-
-
-static int skip_sep (LexState *ls) {
- int count = 0;
- int s = ls->current;
- lua_assert(s == '[' || s == ']');
- save_and_next(ls);
- while (ls->current == '=') {
- save_and_next(ls);
- count++;
- }
- return (ls->current == s) ? count : (-count) - 1;
-}
-
-
-static void read_long_string (LexState *ls, SemInfo *seminfo, int sep) {
- int cont = 0;
- (void)(cont); /* avoid warnings when `cont' is not used */
- save_and_next(ls); /* skip 2nd `[' */
- if (currIsNewline(ls)) /* string starts with a newline? */
- inclinenumber(ls); /* skip it */
- for (;;) {
- switch (ls->current) {
- case EOZ:
- luaX_lexerror(ls, (seminfo) ? "unfinished long string" :
- "unfinished long comment", TK_EOS);
- break; /* to avoid warnings */
-#if defined(LUA_COMPAT_LSTR)
- case '[': {
- if (skip_sep(ls) == sep) {
- save_and_next(ls); /* skip 2nd `[' */
- cont++;
-#if LUA_COMPAT_LSTR == 1
- if (sep == 0)
- luaX_lexerror(ls, "nesting of [[...]] is deprecated", '[');
-#endif
- }
- break;
- }
-#endif
- case ']': {
- if (skip_sep(ls) == sep) {
- save_and_next(ls); /* skip 2nd `]' */
-#if defined(LUA_COMPAT_LSTR) && LUA_COMPAT_LSTR == 2
- cont--;
- if (sep == 0 && cont >= 0) break;
-#endif
- goto endloop;
- }
- break;
- }
- case '\n':
- case '\r': {
- save(ls, '\n');
- inclinenumber(ls);
- if (!seminfo) luaZ_resetbuffer(ls->buff); /* avoid wasting space */
- break;
- }
- default: {
- if (seminfo) save_and_next(ls);
- else next(ls);
- }
- }
- } endloop:
- if (seminfo)
- seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + (2 + sep),
- luaZ_bufflen(ls->buff) - 2*(2 + sep));
-}
-
-
-static void read_string (LexState *ls, int del, SemInfo *seminfo) {
- save_and_next(ls);
- while (ls->current != del) {
- switch (ls->current) {
- case EOZ:
- luaX_lexerror(ls, "unfinished string", TK_EOS);
- continue; /* to avoid warnings */
- case '\n':
- case '\r':
- luaX_lexerror(ls, "unfinished string", TK_STRING);
- continue; /* to avoid warnings */
- case '\\': {
- int c;
- next(ls); /* do not save the `\' */
- switch (ls->current) {
- case 'a': c = '\a'; break;
- case 'b': c = '\b'; break;
- case 'f': c = '\f'; break;
- case 'n': c = '\n'; break;
- case 'r': c = '\r'; break;
- case 't': c = '\t'; break;
- case 'v': c = '\v'; break;
- case '\n': /* go through */
- case '\r': save(ls, '\n'); inclinenumber(ls); continue;
- case EOZ: continue; /* will raise an error next loop */
- default: {
- if (!isdigit(ls->current))
- save_and_next(ls); /* handles \\, \", \', and \? */
- else { /* \xxx */
- int i = 0;
- c = 0;
- do {
- c = 10*c + (ls->current-'0');
- next(ls);
- } while (++i<3 && isdigit(ls->current));
- if (c > UCHAR_MAX)
- luaX_lexerror(ls, "escape sequence too large", TK_STRING);
- save(ls, c);
- }
- continue;
- }
- }
- save(ls, c);
- next(ls);
- continue;
- }
- default:
- save_and_next(ls);
- }
- }
- save_and_next(ls); /* skip delimiter */
- seminfo->ts = luaX_newstring(ls, luaZ_buffer(ls->buff) + 1,
- luaZ_bufflen(ls->buff) - 2);
-}
-
-
-static int llex (LexState *ls, SemInfo *seminfo) {
- luaZ_resetbuffer(ls->buff);
- for (;;) {
- switch (ls->current) {
- case '\n':
- case '\r': {
- inclinenumber(ls);
- continue;
- }
- case '-': {
- next(ls);
- if (ls->current != '-') return '-';
- /* else is a comment */
- next(ls);
- if (ls->current == '[') {
- int sep = skip_sep(ls);
- luaZ_resetbuffer(ls->buff); /* `skip_sep' may dirty the buffer */
- if (sep >= 0) {
- read_long_string(ls, NULL, sep); /* long comment */
- luaZ_resetbuffer(ls->buff);
- continue;
- }
- }
- /* else short comment */
- while (!currIsNewline(ls) && ls->current != EOZ)
- next(ls);
- continue;
- }
- case '[': {
- int sep = skip_sep(ls);
- if (sep >= 0) {
- read_long_string(ls, seminfo, sep);
- return TK_STRING;
- }
- else if (sep == -1) return '[';
- else luaX_lexerror(ls, "invalid long string delimiter", TK_STRING);
- }
- case '=': {
- next(ls);
- if (ls->current != '=') return '=';
- else { next(ls); return TK_EQ; }
- }
- case '<': {
- next(ls);
- if (ls->current != '=') return '<';
- else { next(ls); return TK_LE; }
- }
- case '>': {
- next(ls);
- if (ls->current != '=') return '>';
- else { next(ls); return TK_GE; }
- }
- case '~': {
- next(ls);
- if (ls->current != '=') return '~';
- else { next(ls); return TK_NE; }
- }
- case '"':
- case '\'': {
- read_string(ls, ls->current, seminfo);
- return TK_STRING;
- }
- case '.': {
- save_and_next(ls);
- if (check_next(ls, ".")) {
- if (check_next(ls, "."))
- return TK_DOTS; /* ... */
- else return TK_CONCAT; /* .. */
- }
- else if (!isdigit(ls->current)) return '.';
- else {
- read_numeral(ls, seminfo);
- return TK_NUMBER;
- }
- }
- case EOZ: {
- return TK_EOS;
- }
- default: {
- if (isspace(ls->current)) {
- lua_assert(!currIsNewline(ls));
- next(ls);
- continue;
- }
- else if (isdigit(ls->current)) {
- read_numeral(ls, seminfo);
- return TK_NUMBER;
- }
- else if (isalpha(ls->current) || ls->current == '_') {
- /* identifier or reserved word */
- TString *ts;
- do {
- save_and_next(ls);
- } while (isalnum(ls->current) || ls->current == '_');
- ts = luaX_newstring(ls, luaZ_buffer(ls->buff),
- luaZ_bufflen(ls->buff));
- if (ts->tsv.reserved > 0) /* reserved word? */
- return ts->tsv.reserved - 1 + FIRST_RESERVED;
- else {
- seminfo->ts = ts;
- return TK_NAME;
- }
- }
- else {
- int c = ls->current;
- next(ls);
- return c; /* single-char tokens (+ - / ...) */
- }
- }
- }
- }
-}
-
-
-void luaX_next (LexState *ls) {
- ls->lastline = ls->linenumber;
- if (ls->lookahead.token != TK_EOS) { /* is there a look-ahead token? */
- ls->t = ls->lookahead; /* use this one */
- ls->lookahead.token = TK_EOS; /* and discharge it */
- }
- else
- ls->t.token = llex(ls, &ls->t.seminfo); /* read next token */
-}
-
-
-void luaX_lookahead (LexState *ls) {
- lua_assert(ls->lookahead.token == TK_EOS);
- ls->lookahead.token = llex(ls, &ls->lookahead.seminfo);
-}
+++ /dev/null
-/*
-** $Id: llex.h,v 1.58.1.1 2007/12/27 13:02:25 roberto Exp $
-** Lexical Analyzer
-** See Copyright Notice in lua.h
-*/
-
-#ifndef llex_h
-#define llex_h
-
-#include "lobject.h"
-#include "lzio.h"
-
-
-#define FIRST_RESERVED 257
-
-/* maximum length of a reserved word */
-#define TOKEN_LEN (sizeof("function")/sizeof(char))
-
-
-/*
-* WARNING: if you change the order of this enumeration,
-* grep "ORDER RESERVED"
-*/
-enum RESERVED {
- /* terminal symbols denoted by reserved words */
- TK_AND = FIRST_RESERVED, TK_BREAK,
- TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
- TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
- TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
- /* other terminal symbols */
- TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
- TK_NAME, TK_STRING, TK_EOS
-};
-
-/* number of reserved words */
-#define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
-
-
-/* array with token `names' */
-LUAI_DATA const char *const luaX_tokens [];
-
-
-typedef union {
- lua_Number r;
- TString *ts;
-} SemInfo; /* semantics information */
-
-
-typedef struct Token {
- int token;
- SemInfo seminfo;
-} Token;
-
-
-typedef struct LexState {
- int current; /* current character (charint) */
- int linenumber; /* input line counter */
- int lastline; /* line of last token `consumed' */
- Token t; /* current token */
- Token lookahead; /* look ahead token */
- struct FuncState *fs; /* `FuncState' is private to the parser */
- struct lua_State *L;
- ZIO *z; /* input stream */
- Mbuffer *buff; /* buffer for tokens */
- TString *source; /* current source name */
- char decpoint; /* locale decimal point */
-} LexState;
-
-
-LUAI_FUNC void luaX_init (lua_State *L);
-LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
- TString *source);
-LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
-LUAI_FUNC void luaX_next (LexState *ls);
-LUAI_FUNC void luaX_lookahead (LexState *ls);
-LUAI_FUNC void luaX_lexerror (LexState *ls, const char *msg, int token);
-LUAI_FUNC void luaX_syntaxerror (LexState *ls, const char *s);
-LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: llimits.h,v 1.69.1.1 2007/12/27 13:02:25 roberto Exp $
-** Limits, basic types, and some other `installation-dependent' definitions
-** See Copyright Notice in lua.h
-*/
-
-#ifndef llimits_h
-#define llimits_h
-
-
-#include <limits.h>
-#include <stddef.h>
-
-
-#include "lua.h"
-
-
-typedef LUAI_UINT32 lu_int32;
-
-typedef LUAI_UMEM lu_mem;
-
-typedef LUAI_MEM l_mem;
-
-
-
-/* chars used as small naturals (so that `char' is reserved for characters) */
-typedef unsigned char lu_byte;
-
-
-#define MAX_SIZET ((size_t)(~(size_t)0)-2)
-
-#define MAX_LUMEM ((lu_mem)(~(lu_mem)0)-2)
-
-
-#define MAX_INT (INT_MAX-2) /* maximum value of an int (-2 for safety) */
-
-/*
-** conversion of pointer to integer
-** this is for hashing only; there is no problem if the integer
-** cannot hold the whole pointer value
-*/
-#define IntPoint(p) ((unsigned int)(lu_mem)(p))
-
-
-
-/* type to ensure maximum alignment */
-typedef LUAI_USER_ALIGNMENT_T L_Umaxalign;
-
-
-/* result of a `usual argument conversion' over lua_Number */
-typedef LUAI_UACNUMBER l_uacNumber;
-
-
-/* internal assertions for in-house debugging */
-#ifdef lua_assert
-
-#define check_exp(c,e) (lua_assert(c), (e))
-#define api_check(l,e) lua_assert(e)
-
-#else
-
-#define lua_assert(c) ((void)0)
-#define check_exp(c,e) (e)
-#define api_check luai_apicheck
-
-#endif
-
-
-#ifndef UNUSED
-#define UNUSED(x) ((void)(x)) /* to avoid warnings */
-#endif
-
-
-#ifndef cast
-#define cast(t, exp) ((t)(exp))
-#endif
-
-#define cast_byte(i) cast(lu_byte, (i))
-#define cast_num(i) cast(lua_Number, (i))
-#define cast_int(i) cast(int, (i))
-
-
-
-/*
-** type for virtual-machine instructions
-** must be an unsigned with (at least) 4 bytes (see details in lopcodes.h)
-*/
-typedef lu_int32 Instruction;
-
-
-
-/* maximum stack for a Lua function */
-#define MAXSTACK 250
-
-
-
-/* minimum size for the string table (must be power of 2) */
-#ifndef MINSTRTABSIZE
-#define MINSTRTABSIZE 32
-#endif
-
-
-/* minimum size for string buffer */
-#ifndef LUA_MINBUFFER
-#define LUA_MINBUFFER 32
-#endif
-
-
-#ifndef lua_lock
-#define lua_lock(L) ((void) 0)
-#define lua_unlock(L) ((void) 0)
-#endif
-
-#ifndef luai_threadyield
-#define luai_threadyield(L) {lua_unlock(L); lua_lock(L);}
-#endif
-
-
-/*
-** macro to control inclusion of some hard tests on stack reallocation
-*/
-#ifndef HARDSTACKTESTS
-#define condhardstacktests(x) ((void)0)
-#else
-#define condhardstacktests(x) x
-#endif
-
-#endif
+++ /dev/null
-/*
-** $Id: lmathlib.c,v 1.67.1.1 2007/12/27 13:02:25 roberto Exp $
-** Standard mathematical library
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdlib.h>
-#include <math.h>
-
-#define lmathlib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-#undef PI
-#define PI (3.14159265358979323846)
-#define RADIANS_PER_DEGREE (PI/180.0)
-
-
-
-static int math_abs (lua_State *L) {
- lua_pushnumber(L, fabs(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_sin (lua_State *L) {
- lua_pushnumber(L, sin(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_sinh (lua_State *L) {
- lua_pushnumber(L, sinh(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_cos (lua_State *L) {
- lua_pushnumber(L, cos(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_cosh (lua_State *L) {
- lua_pushnumber(L, cosh(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_tan (lua_State *L) {
- lua_pushnumber(L, tan(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_tanh (lua_State *L) {
- lua_pushnumber(L, tanh(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_asin (lua_State *L) {
- lua_pushnumber(L, asin(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_acos (lua_State *L) {
- lua_pushnumber(L, acos(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_atan (lua_State *L) {
- lua_pushnumber(L, atan(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_atan2 (lua_State *L) {
- lua_pushnumber(L, atan2(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
-}
-
-static int math_ceil (lua_State *L) {
- lua_pushnumber(L, ceil(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_floor (lua_State *L) {
- lua_pushnumber(L, floor(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_fmod (lua_State *L) {
- lua_pushnumber(L, fmod(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
-}
-
-static int math_modf (lua_State *L) {
- double ip;
- double fp = modf(luaL_checknumber(L, 1), &ip);
- lua_pushnumber(L, ip);
- lua_pushnumber(L, fp);
- return 2;
-}
-
-static int math_sqrt (lua_State *L) {
- lua_pushnumber(L, sqrt(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_pow (lua_State *L) {
- lua_pushnumber(L, pow(luaL_checknumber(L, 1), luaL_checknumber(L, 2)));
- return 1;
-}
-
-static int math_log (lua_State *L) {
- lua_pushnumber(L, log(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_log10 (lua_State *L) {
- lua_pushnumber(L, log10(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_exp (lua_State *L) {
- lua_pushnumber(L, exp(luaL_checknumber(L, 1)));
- return 1;
-}
-
-static int math_deg (lua_State *L) {
- lua_pushnumber(L, luaL_checknumber(L, 1)/RADIANS_PER_DEGREE);
- return 1;
-}
-
-static int math_rad (lua_State *L) {
- lua_pushnumber(L, luaL_checknumber(L, 1)*RADIANS_PER_DEGREE);
- return 1;
-}
-
-static int math_frexp (lua_State *L) {
- int e;
- lua_pushnumber(L, frexp(luaL_checknumber(L, 1), &e));
- lua_pushinteger(L, e);
- return 2;
-}
-
-static int math_ldexp (lua_State *L) {
- lua_pushnumber(L, ldexp(luaL_checknumber(L, 1), luaL_checkint(L, 2)));
- return 1;
-}
-
-
-
-static int math_min (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- lua_Number dmin = luaL_checknumber(L, 1);
- int i;
- for (i=2; i<=n; i++) {
- lua_Number d = luaL_checknumber(L, i);
- if (d < dmin)
- dmin = d;
- }
- lua_pushnumber(L, dmin);
- return 1;
-}
-
-
-static int math_max (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- lua_Number dmax = luaL_checknumber(L, 1);
- int i;
- for (i=2; i<=n; i++) {
- lua_Number d = luaL_checknumber(L, i);
- if (d > dmax)
- dmax = d;
- }
- lua_pushnumber(L, dmax);
- return 1;
-}
-
-
-static int math_random (lua_State *L) {
- /* the `%' avoids the (rare) case of r==1, and is needed also because on
- some systems (SunOS!) `rand()' may return a value larger than RAND_MAX */
- lua_Number r = (lua_Number)(rand()%RAND_MAX) / (lua_Number)RAND_MAX;
- switch (lua_gettop(L)) { /* check number of arguments */
- case 0: { /* no arguments */
- lua_pushnumber(L, r); /* Number between 0 and 1 */
- break;
- }
- case 1: { /* only upper limit */
- int u = luaL_checkint(L, 1);
- luaL_argcheck(L, 1<=u, 1, "interval is empty");
- lua_pushnumber(L, floor(r*u)+1); /* int between 1 and `u' */
- break;
- }
- case 2: { /* lower and upper limits */
- int l = luaL_checkint(L, 1);
- int u = luaL_checkint(L, 2);
- luaL_argcheck(L, l<=u, 2, "interval is empty");
- lua_pushnumber(L, floor(r*(u-l+1))+l); /* int between `l' and `u' */
- break;
- }
- default: return luaL_error(L, "wrong number of arguments");
- }
- return 1;
-}
-
-
-static int math_randomseed (lua_State *L) {
- srand(luaL_checkint(L, 1));
- return 0;
-}
-
-
-static const luaL_Reg mathlib[] = {
- {"abs", math_abs},
- {"acos", math_acos},
- {"asin", math_asin},
- {"atan2", math_atan2},
- {"atan", math_atan},
- {"ceil", math_ceil},
- {"cosh", math_cosh},
- {"cos", math_cos},
- {"deg", math_deg},
- {"exp", math_exp},
- {"floor", math_floor},
- {"fmod", math_fmod},
- {"frexp", math_frexp},
- {"ldexp", math_ldexp},
- {"log10", math_log10},
- {"log", math_log},
- {"max", math_max},
- {"min", math_min},
- {"modf", math_modf},
- {"pow", math_pow},
- {"rad", math_rad},
- {"random", math_random},
- {"randomseed", math_randomseed},
- {"sinh", math_sinh},
- {"sin", math_sin},
- {"sqrt", math_sqrt},
- {"tanh", math_tanh},
- {"tan", math_tan},
- {NULL, NULL}
-};
-
-
-/*
-** Open math library
-*/
-LUALIB_API int luaopen_math (lua_State *L) {
- luaL_register(L, LUA_MATHLIBNAME, mathlib);
- lua_pushnumber(L, PI);
- lua_setfield(L, -2, "pi");
- lua_pushnumber(L, HUGE_VAL);
- lua_setfield(L, -2, "huge");
-#if defined(LUA_COMPAT_MOD)
- lua_getfield(L, -1, "fmod");
- lua_setfield(L, -2, "mod");
-#endif
- return 1;
-}
+++ /dev/null
-/*
-** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
-** Interface to Memory Manager
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stddef.h>
-
-#define lmem_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-
-
-
-/*
-** About the realloc function:
-** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
-** (`osize' is the old size, `nsize' is the new size)
-**
-** Lua ensures that (ptr == NULL) iff (osize == 0).
-**
-** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
-**
-** * frealloc(ud, p, x, 0) frees the block `p'
-** (in this specific case, frealloc must return NULL).
-** particularly, frealloc(ud, NULL, 0, 0) does nothing
-** (which is equivalent to free(NULL) in ANSI C)
-**
-** frealloc returns NULL if it cannot create or reallocate the area
-** (any reallocation to an equal or smaller size cannot fail!)
-*/
-
-
-
-#define MINSIZEARRAY 4
-
-
-void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems,
- int limit, const char *errormsg) {
- void *newblock;
- int newsize;
- if (*size >= limit/2) { /* cannot double it? */
- if (*size >= limit) /* cannot grow even a little? */
- luaG_runerror(L, errormsg);
- newsize = limit; /* still have at least one free place */
- }
- else {
- newsize = (*size)*2;
- if (newsize < MINSIZEARRAY)
- newsize = MINSIZEARRAY; /* minimum size */
- }
- newblock = luaM_reallocv(L, block, *size, newsize, size_elems);
- *size = newsize; /* update only when everything else is OK */
- return newblock;
-}
-
-
-void *luaM_toobig (lua_State *L) {
- luaG_runerror(L, "memory allocation error: block too big");
- return NULL; /* to avoid warnings */
-}
-
-
-
-/*
-** generic allocation routine.
-*/
-void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
- global_State *g = G(L);
- lua_assert((osize == 0) == (block == NULL));
- block = (*g->frealloc)(g->ud, block, osize, nsize);
- if (block == NULL && nsize > 0)
- luaD_throw(L, LUA_ERRMEM);
- lua_assert((nsize == 0) == (block == NULL));
- g->totalbytes = (g->totalbytes - osize) + nsize;
- return block;
-}
+++ /dev/null
-/*
-** $Id: lmem.h,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
-** Interface to Memory Manager
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lmem_h
-#define lmem_h
-
-
-#include <stddef.h>
-
-#include "llimits.h"
-#include "lua.h"
-
-#define MEMERRMSG "not enough memory"
-
-
-#define luaM_reallocv(L,b,on,n,e) \
- ((cast(size_t, (n)+1) <= MAX_SIZET/(e)) ? /* +1 to avoid warnings */ \
- luaM_realloc_(L, (b), (on)*(e), (n)*(e)) : \
- luaM_toobig(L))
-
-#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)
-#define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0)
-#define luaM_freearray(L, b, n, t) luaM_reallocv(L, (b), n, 0, sizeof(t))
-
-#define luaM_malloc(L,t) luaM_realloc_(L, NULL, 0, (t))
-#define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t)))
-#define luaM_newvector(L,n,t) \
- cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
-
-#define luaM_growvector(L,v,nelems,size,t,limit,e) \
- if ((nelems)+1 > (size)) \
- ((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
-
-#define luaM_reallocvector(L, v,oldn,n,t) \
- ((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))
-
-
-LUAI_FUNC void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize,
- size_t size);
-LUAI_FUNC void *luaM_toobig (lua_State *L);
-LUAI_FUNC void *luaM_growaux_ (lua_State *L, void *block, int *size,
- size_t size_elem, int limit,
- const char *errormsg);
-
-#endif
+++ /dev/null
-/*
-** $Id: loadlib.c,v 1.52.1.3 2008/08/06 13:29:28 roberto Exp $
-** Dynamic library loader for Lua
-** See Copyright Notice in lua.h
-**
-** This module contains an implementation of loadlib for Unix systems
-** that have dlfcn, an implementation for Darwin (Mac OS X), an
-** implementation for Windows, and a stub for other systems.
-*/
-
-
-#include <stdlib.h>
-#include <string.h>
-
-
-#define loadlib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-/* prefix for open functions in C libraries */
-#define LUA_POF "luaopen_"
-
-/* separator for open functions in C libraries */
-#define LUA_OFSEP "_"
-
-
-#define LIBPREFIX "LOADLIB: "
-
-#define POF LUA_POF
-#define LIB_FAIL "open"
-
-
-/* error codes for ll_loadfunc */
-#define ERRLIB 1
-#define ERRFUNC 2
-
-#define setprogdir(L) ((void)0)
-
-
-static void ll_unloadlib (void *lib);
-static void *ll_load (lua_State *L, const char *path);
-static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym);
-
-
-
-#if defined(LUA_DL_DLOPEN)
-/*
-** {========================================================================
-** This is an implementation of loadlib based on the dlfcn interface.
-** The dlfcn interface is available in Linux, SunOS, Solaris, IRIX, FreeBSD,
-** NetBSD, AIX 4.2, HPUX 11, and probably most other Unix flavors, at least
-** as an emulation layer on top of native functions.
-** =========================================================================
-*/
-
-#include <dlfcn.h>
-
-static void ll_unloadlib (void *lib) {
- dlclose(lib);
-}
-
-
-static void *ll_load (lua_State *L, const char *path) {
- void *lib = dlopen(path, RTLD_NOW);
- if (lib == NULL) lua_pushstring(L, dlerror());
- return lib;
-}
-
-
-static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
- lua_CFunction f = (lua_CFunction)dlsym(lib, sym);
- if (f == NULL) lua_pushstring(L, dlerror());
- return f;
-}
-
-/* }====================================================== */
-
-
-
-#elif defined(LUA_DL_DLL)
-/*
-** {======================================================================
-** This is an implementation of loadlib for Windows using native functions.
-** =======================================================================
-*/
-
-#include <windows.h>
-
-
-#undef setprogdir
-
-static void setprogdir (lua_State *L) {
- char buff[MAX_PATH + 1];
- char *lb;
- DWORD nsize = sizeof(buff)/sizeof(char);
- DWORD n = GetModuleFileNameA(NULL, buff, nsize);
- if (n == 0 || n == nsize || (lb = strrchr(buff, '\\')) == NULL)
- luaL_error(L, "unable to get ModuleFileName");
- else {
- *lb = '\0';
- luaL_gsub(L, lua_tostring(L, -1), LUA_EXECDIR, buff);
- lua_remove(L, -2); /* remove original string */
- }
-}
-
-
-static void pusherror (lua_State *L) {
- int error = GetLastError();
- char buffer[128];
- if (FormatMessageA(FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_FROM_SYSTEM,
- NULL, error, 0, buffer, sizeof(buffer), NULL))
- lua_pushstring(L, buffer);
- else
- lua_pushfstring(L, "system error %d\n", error);
-}
-
-static void ll_unloadlib (void *lib) {
- FreeLibrary((HINSTANCE)lib);
-}
-
-
-static void *ll_load (lua_State *L, const char *path) {
- HINSTANCE lib = LoadLibraryA(path);
- if (lib == NULL) pusherror(L);
- return lib;
-}
-
-
-static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
- lua_CFunction f = (lua_CFunction)GetProcAddress((HINSTANCE)lib, sym);
- if (f == NULL) pusherror(L);
- return f;
-}
-
-/* }====================================================== */
-
-
-
-#elif defined(LUA_DL_DYLD)
-/*
-** {======================================================================
-** Native Mac OS X / Darwin Implementation
-** =======================================================================
-*/
-
-#include <mach-o/dyld.h>
-
-
-/* Mac appends a `_' before C function names */
-#undef POF
-#define POF "_" LUA_POF
-
-
-static void pusherror (lua_State *L) {
- const char *err_str;
- const char *err_file;
- NSLinkEditErrors err;
- int err_num;
- NSLinkEditError(&err, &err_num, &err_file, &err_str);
- lua_pushstring(L, err_str);
-}
-
-
-static const char *errorfromcode (NSObjectFileImageReturnCode ret) {
- switch (ret) {
- case NSObjectFileImageInappropriateFile:
- return "file is not a bundle";
- case NSObjectFileImageArch:
- return "library is for wrong CPU type";
- case NSObjectFileImageFormat:
- return "bad format";
- case NSObjectFileImageAccess:
- return "cannot access file";
- case NSObjectFileImageFailure:
- default:
- return "unable to load library";
- }
-}
-
-
-static void ll_unloadlib (void *lib) {
- NSUnLinkModule((NSModule)lib, NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES);
-}
-
-
-static void *ll_load (lua_State *L, const char *path) {
- NSObjectFileImage img;
- NSObjectFileImageReturnCode ret;
- /* this would be a rare case, but prevents crashing if it happens */
- if(!_dyld_present()) {
- lua_pushliteral(L, "dyld not present");
- return NULL;
- }
- ret = NSCreateObjectFileImageFromFile(path, &img);
- if (ret == NSObjectFileImageSuccess) {
- NSModule mod = NSLinkModule(img, path, NSLINKMODULE_OPTION_PRIVATE |
- NSLINKMODULE_OPTION_RETURN_ON_ERROR);
- NSDestroyObjectFileImage(img);
- if (mod == NULL) pusherror(L);
- return mod;
- }
- lua_pushstring(L, errorfromcode(ret));
- return NULL;
-}
-
-
-static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
- NSSymbol nss = NSLookupSymbolInModule((NSModule)lib, sym);
- if (nss == NULL) {
- lua_pushfstring(L, "symbol " LUA_QS " not found", sym);
- return NULL;
- }
- return (lua_CFunction)NSAddressOfSymbol(nss);
-}
-
-/* }====================================================== */
-
-
-
-#else
-/*
-** {======================================================
-** Fallback for other systems
-** =======================================================
-*/
-
-#undef LIB_FAIL
-#define LIB_FAIL "absent"
-
-
-#define DLMSG "dynamic libraries not enabled; check your Lua installation"
-
-
-static void ll_unloadlib (void *lib) {
- (void)lib; /* to avoid warnings */
-}
-
-
-static void *ll_load (lua_State *L, const char *path) {
- (void)path; /* to avoid warnings */
- lua_pushliteral(L, DLMSG);
- return NULL;
-}
-
-
-static lua_CFunction ll_sym (lua_State *L, void *lib, const char *sym) {
- (void)lib; (void)sym; /* to avoid warnings */
- lua_pushliteral(L, DLMSG);
- return NULL;
-}
-
-/* }====================================================== */
-#endif
-
-
-
-static void **ll_register (lua_State *L, const char *path) {
- void **plib;
- lua_pushfstring(L, "%s%s", LIBPREFIX, path);
- lua_gettable(L, LUA_REGISTRYINDEX); /* check library in registry? */
- if (!lua_isnil(L, -1)) /* is there an entry? */
- plib = (void **)lua_touserdata(L, -1);
- else { /* no entry yet; create one */
- lua_pop(L, 1);
- plib = (void **)lua_newuserdata(L, sizeof(const void *));
- *plib = NULL;
- luaL_getmetatable(L, "_LOADLIB");
- lua_setmetatable(L, -2);
- lua_pushfstring(L, "%s%s", LIBPREFIX, path);
- lua_pushvalue(L, -2);
- lua_settable(L, LUA_REGISTRYINDEX);
- }
- return plib;
-}
-
-
-/*
-** __gc tag method: calls library's `ll_unloadlib' function with the lib
-** handle
-*/
-static int gctm (lua_State *L) {
- void **lib = (void **)luaL_checkudata(L, 1, "_LOADLIB");
- if (*lib) ll_unloadlib(*lib);
- *lib = NULL; /* mark library as closed */
- return 0;
-}
-
-
-static int ll_loadfunc (lua_State *L, const char *path, const char *sym) {
- void **reg = ll_register(L, path);
- if (*reg == NULL) *reg = ll_load(L, path);
- if (*reg == NULL)
- return ERRLIB; /* unable to load library */
- else {
- lua_CFunction f = ll_sym(L, *reg, sym);
- if (f == NULL)
- return ERRFUNC; /* unable to find function */
- lua_pushcfunction(L, f);
- return 0; /* return function */
- }
-}
-
-
-static int ll_loadlib (lua_State *L) {
- const char *path = luaL_checkstring(L, 1);
- const char *init = luaL_checkstring(L, 2);
- int stat = ll_loadfunc(L, path, init);
- if (stat == 0) /* no errors? */
- return 1; /* return the loaded function */
- else { /* error; error message is on stack top */
- lua_pushnil(L);
- lua_insert(L, -2);
- lua_pushstring(L, (stat == ERRLIB) ? LIB_FAIL : "init");
- return 3; /* return nil, error message, and where */
- }
-}
-
-
-
-/*
-** {======================================================
-** 'require' function
-** =======================================================
-*/
-
-
-static int readable (const char *filename) {
- FILE *f = fopen(filename, "r"); /* try to open file */
- if (f == NULL) return 0; /* open failed */
- fclose(f);
- return 1;
-}
-
-
-static const char *pushnexttemplate (lua_State *L, const char *path) {
- const char *l;
- while (*path == *LUA_PATHSEP) path++; /* skip separators */
- if (*path == '\0') return NULL; /* no more templates */
- l = strchr(path, *LUA_PATHSEP); /* find next separator */
- if (l == NULL) l = path + strlen(path);
- lua_pushlstring(L, path, l - path); /* template */
- return l;
-}
-
-
-static const char *findfile (lua_State *L, const char *name,
- const char *pname) {
- const char *path;
- name = luaL_gsub(L, name, ".", LUA_DIRSEP);
- lua_getfield(L, LUA_ENVIRONINDEX, pname);
- path = lua_tostring(L, -1);
- if (path == NULL)
- luaL_error(L, LUA_QL("package.%s") " must be a string", pname);
- lua_pushliteral(L, ""); /* error accumulator */
- while ((path = pushnexttemplate(L, path)) != NULL) {
- const char *filename;
- filename = luaL_gsub(L, lua_tostring(L, -1), LUA_PATH_MARK, name);
- lua_remove(L, -2); /* remove path template */
- if (readable(filename)) /* does file exist and is readable? */
- return filename; /* return that file name */
- lua_pushfstring(L, "\n\tno file " LUA_QS, filename);
- lua_remove(L, -2); /* remove file name */
- lua_concat(L, 2); /* add entry to possible error message */
- }
- return NULL; /* not found */
-}
-
-
-static void loaderror (lua_State *L, const char *filename) {
- luaL_error(L, "error loading module " LUA_QS " from file " LUA_QS ":\n\t%s",
- lua_tostring(L, 1), filename, lua_tostring(L, -1));
-}
-
-
-static int loader_Lua (lua_State *L) {
- const char *filename;
- const char *name = luaL_checkstring(L, 1);
- filename = findfile(L, name, "path");
- if (filename == NULL) return 1; /* library not found in this path */
- if (luaL_loadfile(L, filename) != 0)
- loaderror(L, filename);
- return 1; /* library loaded successfully */
-}
-
-
-static const char *mkfuncname (lua_State *L, const char *modname) {
- const char *funcname;
- const char *mark = strchr(modname, *LUA_IGMARK);
- if (mark) modname = mark + 1;
- funcname = luaL_gsub(L, modname, ".", LUA_OFSEP);
- funcname = lua_pushfstring(L, POF"%s", funcname);
- lua_remove(L, -2); /* remove 'gsub' result */
- return funcname;
-}
-
-
-static int loader_C (lua_State *L) {
- const char *funcname;
- const char *name = luaL_checkstring(L, 1);
- const char *filename = findfile(L, name, "cpath");
- if (filename == NULL) return 1; /* library not found in this path */
- funcname = mkfuncname(L, name);
- if (ll_loadfunc(L, filename, funcname) != 0)
- loaderror(L, filename);
- return 1; /* library loaded successfully */
-}
-
-
-static int loader_Croot (lua_State *L) {
- const char *funcname;
- const char *filename;
- const char *name = luaL_checkstring(L, 1);
- const char *p = strchr(name, '.');
- int stat;
- if (p == NULL) return 0; /* is root */
- lua_pushlstring(L, name, p - name);
- filename = findfile(L, lua_tostring(L, -1), "cpath");
- if (filename == NULL) return 1; /* root not found */
- funcname = mkfuncname(L, name);
- if ((stat = ll_loadfunc(L, filename, funcname)) != 0) {
- if (stat != ERRFUNC) loaderror(L, filename); /* real error */
- lua_pushfstring(L, "\n\tno module " LUA_QS " in file " LUA_QS,
- name, filename);
- return 1; /* function not found */
- }
- return 1;
-}
-
-
-static int loader_preload (lua_State *L) {
- const char *name = luaL_checkstring(L, 1);
- lua_getfield(L, LUA_ENVIRONINDEX, "preload");
- if (!lua_istable(L, -1))
- luaL_error(L, LUA_QL("package.preload") " must be a table");
- lua_getfield(L, -1, name);
- if (lua_isnil(L, -1)) /* not found? */
- lua_pushfstring(L, "\n\tno field package.preload['%s']", name);
- return 1;
-}
-
-
-static const int sentinel_ = 0;
-#define sentinel ((void *)&sentinel_)
-
-
-static int ll_require (lua_State *L) {
- const char *name = luaL_checkstring(L, 1);
- int i;
- lua_settop(L, 1); /* _LOADED table will be at index 2 */
- lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
- lua_getfield(L, 2, name);
- if (lua_toboolean(L, -1)) { /* is it there? */
- if (lua_touserdata(L, -1) == sentinel) /* check loops */
- luaL_error(L, "loop or previous error loading module " LUA_QS, name);
- return 1; /* package is already loaded */
- }
- /* else must load it; iterate over available loaders */
- lua_getfield(L, LUA_ENVIRONINDEX, "loaders");
- if (!lua_istable(L, -1))
- luaL_error(L, LUA_QL("package.loaders") " must be a table");
- lua_pushliteral(L, ""); /* error message accumulator */
- for (i=1; ; i++) {
- lua_rawgeti(L, -2, i); /* get a loader */
- if (lua_isnil(L, -1))
- luaL_error(L, "module " LUA_QS " not found:%s",
- name, lua_tostring(L, -2));
- lua_pushstring(L, name);
- lua_call(L, 1, 1); /* call it */
- if (lua_isfunction(L, -1)) /* did it find module? */
- break; /* module loaded successfully */
- else if (lua_isstring(L, -1)) /* loader returned error message? */
- lua_concat(L, 2); /* accumulate it */
- else
- lua_pop(L, 1);
- }
- lua_pushlightuserdata(L, sentinel);
- lua_setfield(L, 2, name); /* _LOADED[name] = sentinel */
- lua_pushstring(L, name); /* pass name as argument to module */
- lua_call(L, 1, 1); /* run loaded module */
- if (!lua_isnil(L, -1)) /* non-nil return? */
- lua_setfield(L, 2, name); /* _LOADED[name] = returned value */
- lua_getfield(L, 2, name);
- if (lua_touserdata(L, -1) == sentinel) { /* module did not set a value? */
- lua_pushboolean(L, 1); /* use true as result */
- lua_pushvalue(L, -1); /* extra copy to be returned */
- lua_setfield(L, 2, name); /* _LOADED[name] = true */
- }
- return 1;
-}
-
-/* }====================================================== */
-
-
-
-/*
-** {======================================================
-** 'module' function
-** =======================================================
-*/
-
-
-static void setfenv (lua_State *L) {
- lua_Debug ar;
- if (lua_getstack(L, 1, &ar) == 0 ||
- lua_getinfo(L, "f", &ar) == 0 || /* get calling function */
- lua_iscfunction(L, -1))
- luaL_error(L, LUA_QL("module") " not called from a Lua function");
- lua_pushvalue(L, -2);
- lua_setfenv(L, -2);
- lua_pop(L, 1);
-}
-
-
-static void dooptions (lua_State *L, int n) {
- int i;
- for (i = 2; i <= n; i++) {
- lua_pushvalue(L, i); /* get option (a function) */
- lua_pushvalue(L, -2); /* module */
- lua_call(L, 1, 0);
- }
-}
-
-
-static void modinit (lua_State *L, const char *modname) {
- const char *dot;
- lua_pushvalue(L, -1);
- lua_setfield(L, -2, "_M"); /* module._M = module */
- lua_pushstring(L, modname);
- lua_setfield(L, -2, "_NAME");
- dot = strrchr(modname, '.'); /* look for last dot in module name */
- if (dot == NULL) dot = modname;
- else dot++;
- /* set _PACKAGE as package name (full module name minus last part) */
- lua_pushlstring(L, modname, dot - modname);
- lua_setfield(L, -2, "_PACKAGE");
-}
-
-
-static int ll_module (lua_State *L) {
- const char *modname = luaL_checkstring(L, 1);
- int loaded = lua_gettop(L) + 1; /* index of _LOADED table */
- lua_getfield(L, LUA_REGISTRYINDEX, "_LOADED");
- lua_getfield(L, loaded, modname); /* get _LOADED[modname] */
- if (!lua_istable(L, -1)) { /* not found? */
- lua_pop(L, 1); /* remove previous result */
- /* try global variable (and create one if it does not exist) */
- if (luaL_findtable(L, LUA_GLOBALSINDEX, modname, 1) != NULL)
- return luaL_error(L, "name conflict for module " LUA_QS, modname);
- lua_pushvalue(L, -1);
- lua_setfield(L, loaded, modname); /* _LOADED[modname] = new table */
- }
- /* check whether table already has a _NAME field */
- lua_getfield(L, -1, "_NAME");
- if (!lua_isnil(L, -1)) /* is table an initialized module? */
- lua_pop(L, 1);
- else { /* no; initialize it */
- lua_pop(L, 1);
- modinit(L, modname);
- }
- lua_pushvalue(L, -1);
- setfenv(L);
- dooptions(L, loaded - 1);
- return 0;
-}
-
-
-static int ll_seeall (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- if (!lua_getmetatable(L, 1)) {
- lua_createtable(L, 0, 1); /* create new metatable */
- lua_pushvalue(L, -1);
- lua_setmetatable(L, 1);
- }
- lua_pushvalue(L, LUA_GLOBALSINDEX);
- lua_setfield(L, -2, "__index"); /* mt.__index = _G */
- return 0;
-}
-
-
-/* }====================================================== */
-
-
-
-/* auxiliary mark (for internal use) */
-#define AUXMARK "\1"
-
-static void setpath (lua_State *L, const char *fieldname, const char *envname,
- const char *def) {
- const char *path = getenv(envname);
- if (path == NULL) /* no environment variable? */
- lua_pushstring(L, def); /* use default */
- else {
- /* replace ";;" by ";AUXMARK;" and then AUXMARK by default path */
- path = luaL_gsub(L, path, LUA_PATHSEP LUA_PATHSEP,
- LUA_PATHSEP AUXMARK LUA_PATHSEP);
- luaL_gsub(L, path, AUXMARK, def);
- lua_remove(L, -2);
- }
- setprogdir(L);
- lua_setfield(L, -2, fieldname);
-}
-
-
-static const luaL_Reg pk_funcs[] = {
- {"loadlib", ll_loadlib},
- {"seeall", ll_seeall},
- {NULL, NULL}
-};
-
-
-static const luaL_Reg ll_funcs[] = {
- {"module", ll_module},
- {"require", ll_require},
- {NULL, NULL}
-};
-
-
-static const lua_CFunction loaders[] =
- {loader_preload, loader_Lua, loader_C, loader_Croot, NULL};
-
-
-LUALIB_API int luaopen_package (lua_State *L) {
- int i;
- /* create new type _LOADLIB */
- luaL_newmetatable(L, "_LOADLIB");
- lua_pushcfunction(L, gctm);
- lua_setfield(L, -2, "__gc");
- /* create `package' table */
- luaL_register(L, LUA_LOADLIBNAME, pk_funcs);
-#if defined(LUA_COMPAT_LOADLIB)
- lua_getfield(L, -1, "loadlib");
- lua_setfield(L, LUA_GLOBALSINDEX, "loadlib");
-#endif
- lua_pushvalue(L, -1);
- lua_replace(L, LUA_ENVIRONINDEX);
- /* create `loaders' table */
- lua_createtable(L, 0, sizeof(loaders)/sizeof(loaders[0]) - 1);
- /* fill it with pre-defined loaders */
- for (i=0; loaders[i] != NULL; i++) {
- lua_pushcfunction(L, loaders[i]);
- lua_rawseti(L, -2, i+1);
- }
- lua_setfield(L, -2, "loaders"); /* put it in field `loaders' */
- setpath(L, "path", LUA_PATH, LUA_PATH_DEFAULT); /* set field `path' */
- setpath(L, "cpath", LUA_CPATH, LUA_CPATH_DEFAULT); /* set field `cpath' */
- /* store config information */
- lua_pushliteral(L, LUA_DIRSEP "\n" LUA_PATHSEP "\n" LUA_PATH_MARK "\n"
- LUA_EXECDIR "\n" LUA_IGMARK);
- lua_setfield(L, -2, "config");
- /* set field `loaded' */
- luaL_findtable(L, LUA_REGISTRYINDEX, "_LOADED", 2);
- lua_setfield(L, -2, "loaded");
- /* set field `preload' */
- lua_newtable(L);
- lua_setfield(L, -2, "preload");
- lua_pushvalue(L, LUA_GLOBALSINDEX);
- luaL_register(L, NULL, ll_funcs); /* open lib into global table */
- lua_pop(L, 1);
- return 1; /* return 'package' table */
-}
+++ /dev/null
-/*
-** $Id: lobject.c,v 2.22.1.1 2007/12/27 13:02:25 roberto Exp $
-** Some generic functions over Lua objects
-** See Copyright Notice in lua.h
-*/
-
-#include <ctype.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lobject_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldo.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "lvm.h"
-
-
-
-const TValue luaO_nilobject_ = {{NULL}, LUA_TNIL};
-
-
-/*
-** converts an integer to a "floating point byte", represented as
-** (eeeeexxx), where the real value is (1xxx) * 2^(eeeee - 1) if
-** eeeee != 0 and (xxx) otherwise.
-*/
-int luaO_int2fb (unsigned int x) {
- int e = 0; /* expoent */
- while (x >= 16) {
- x = (x+1) >> 1;
- e++;
- }
- if (x < 8) return x;
- else return ((e+1) << 3) | (cast_int(x) - 8);
-}
-
-
-/* converts back */
-int luaO_fb2int (int x) {
- int e = (x >> 3) & 31;
- if (e == 0) return x;
- else return ((x & 7)+8) << (e - 1);
-}
-
-
-int luaO_log2 (unsigned int x) {
- static const lu_byte log_2[256] = {
- 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
- 6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,
- 8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8,8
- };
- int l = -1;
- while (x >= 256) { l += 8; x >>= 8; }
- return l + log_2[x];
-
-}
-
-
-int luaO_rawequalObj (const TValue *t1, const TValue *t2) {
- if (ttype(t1) != ttype(t2)) return 0;
- else switch (ttype(t1)) {
- case LUA_TNIL:
- return 1;
- case LUA_TNUMBER:
- return luai_numeq(nvalue(t1), nvalue(t2));
- case LUA_TBOOLEAN:
- return bvalue(t1) == bvalue(t2); /* boolean true must be 1 !! */
- case LUA_TLIGHTUSERDATA:
- return pvalue(t1) == pvalue(t2);
- default:
- lua_assert(iscollectable(t1));
- return gcvalue(t1) == gcvalue(t2);
- }
-}
-
-
-int luaO_str2d (const char *s, lua_Number *result) {
- char *endptr;
- *result = lua_str2number(s, &endptr);
- if (endptr == s) return 0; /* conversion failed */
- if (*endptr == 'x' || *endptr == 'X') /* maybe an hexadecimal constant? */
- *result = cast_num(strtoul(s, &endptr, 16));
- if (*endptr == '\0') return 1; /* most common case */
- while (isspace(cast(unsigned char, *endptr))) endptr++;
- if (*endptr != '\0') return 0; /* invalid trailing characters? */
- return 1;
-}
-
-
-
-static void pushstr (lua_State *L, const char *str) {
- setsvalue2s(L, L->top, luaS_new(L, str));
- incr_top(L);
-}
-
-
-/* this function handles only `%d', `%c', %f, %p, and `%s' formats */
-const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
- int n = 1;
- pushstr(L, "");
- for (;;) {
- const char *e = strchr(fmt, '%');
- if (e == NULL) break;
- setsvalue2s(L, L->top, luaS_newlstr(L, fmt, e-fmt));
- incr_top(L);
- switch (*(e+1)) {
- case 's': {
- const char *s = va_arg(argp, char *);
- if (s == NULL) s = "(null)";
- pushstr(L, s);
- break;
- }
- case 'c': {
- char buff[2];
- buff[0] = cast(char, va_arg(argp, int));
- buff[1] = '\0';
- pushstr(L, buff);
- break;
- }
- case 'd': {
- setnvalue(L->top, cast_num(va_arg(argp, int)));
- incr_top(L);
- break;
- }
- case 'f': {
- setnvalue(L->top, cast_num(va_arg(argp, l_uacNumber)));
- incr_top(L);
- break;
- }
- case 'p': {
- char buff[4*sizeof(void *) + 8]; /* should be enough space for a `%p' */
- sprintf(buff, "%p", va_arg(argp, void *));
- pushstr(L, buff);
- break;
- }
- case '%': {
- pushstr(L, "%");
- break;
- }
- default: {
- char buff[3];
- buff[0] = '%';
- buff[1] = *(e+1);
- buff[2] = '\0';
- pushstr(L, buff);
- break;
- }
- }
- n += 2;
- fmt = e+2;
- }
- pushstr(L, fmt);
- luaV_concat(L, n+1, cast_int(L->top - L->base) - 1);
- L->top -= n;
- return svalue(L->top - 1);
-}
-
-
-const char *luaO_pushfstring (lua_State *L, const char *fmt, ...) {
- const char *msg;
- va_list argp;
- va_start(argp, fmt);
- msg = luaO_pushvfstring(L, fmt, argp);
- va_end(argp);
- return msg;
-}
-
-
-void luaO_chunkid (char *out, const char *source, size_t bufflen) {
- if (*source == '=') {
- strncpy(out, source+1, bufflen); /* remove first char */
- out[bufflen-1] = '\0'; /* ensures null termination */
- }
- else { /* out = "source", or "...source" */
- if (*source == '@') {
- size_t l;
- source++; /* skip the `@' */
- bufflen -= sizeof(" '...' ");
- l = strlen(source);
- strcpy(out, "");
- if (l > bufflen) {
- source += (l-bufflen); /* get last part of file name */
- strcat(out, "...");
- }
- strcat(out, source);
- }
- else { /* out = [string "string"] */
- size_t len = strcspn(source, "\n\r"); /* stop at first newline */
- bufflen -= sizeof(" [string \"...\"] ");
- if (len > bufflen) len = bufflen;
- strcpy(out, "[string \"");
- if (source[len] != '\0') { /* must truncate? */
- strncat(out, source, len);
- strcat(out, "...");
- }
- else
- strcat(out, source);
- strcat(out, "\"]");
- }
- }
-}
+++ /dev/null
-/*
-** $Id: lobject.h,v 2.20.1.2 2008/08/06 13:29:48 roberto Exp $
-** Type definitions for Lua objects
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lobject_h
-#define lobject_h
-
-
-#include <stdarg.h>
-
-
-#include "llimits.h"
-#include "lua.h"
-
-
-/* tags for values visible from Lua */
-#define LAST_TAG LUA_TTHREAD
-
-#define NUM_TAGS (LAST_TAG+1)
-
-
-/*
-** Extra tags for non-values
-*/
-#define LUA_TPROTO (LAST_TAG+1)
-#define LUA_TUPVAL (LAST_TAG+2)
-#define LUA_TDEADKEY (LAST_TAG+3)
-
-
-/*
-** Union of all collectable objects
-*/
-typedef union GCObject GCObject;
-
-
-/*
-** Common Header for all collectable objects (in macro form, to be
-** included in other objects)
-*/
-#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked
-
-
-/*
-** Common header in struct form
-*/
-typedef struct GCheader {
- CommonHeader;
-} GCheader;
-
-
-
-
-/*
-** Union of all Lua values
-*/
-typedef union {
- GCObject *gc;
- void *p;
- lua_Number n;
- int b;
-} Value;
-
-
-/*
-** Tagged Values
-*/
-
-#define TValuefields Value value; int tt
-
-typedef struct lua_TValue {
- TValuefields;
-} TValue;
-
-
-/* Macros to test type */
-#define ttisnil(o) (ttype(o) == LUA_TNIL)
-#define ttisnumber(o) (ttype(o) == LUA_TNUMBER)
-#define ttisstring(o) (ttype(o) == LUA_TSTRING)
-#define ttistable(o) (ttype(o) == LUA_TTABLE)
-#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION)
-#define ttisboolean(o) (ttype(o) == LUA_TBOOLEAN)
-#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA)
-#define ttisthread(o) (ttype(o) == LUA_TTHREAD)
-#define ttislightuserdata(o) (ttype(o) == LUA_TLIGHTUSERDATA)
-
-/* Macros to access values */
-#define ttype(o) ((o)->tt)
-#define gcvalue(o) check_exp(iscollectable(o), (o)->value.gc)
-#define pvalue(o) check_exp(ttislightuserdata(o), (o)->value.p)
-#define nvalue(o) check_exp(ttisnumber(o), (o)->value.n)
-#define rawtsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts)
-#define tsvalue(o) (&rawtsvalue(o)->tsv)
-#define rawuvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u)
-#define uvalue(o) (&rawuvalue(o)->uv)
-#define clvalue(o) check_exp(ttisfunction(o), &(o)->value.gc->cl)
-#define hvalue(o) check_exp(ttistable(o), &(o)->value.gc->h)
-#define bvalue(o) check_exp(ttisboolean(o), (o)->value.b)
-#define thvalue(o) check_exp(ttisthread(o), &(o)->value.gc->th)
-
-#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
-
-/*
-** for internal debug only
-*/
-#define checkconsistency(obj) \
- lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt))
-
-#define checkliveness(g,obj) \
- lua_assert(!iscollectable(obj) || \
- ((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc)))
-
-
-/* Macros to set values */
-#define setnilvalue(obj) ((obj)->tt=LUA_TNIL)
-
-#define setnvalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; }
-
-#define setpvalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; }
-
-#define setbvalue(obj,x) \
- { TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; }
-
-#define setsvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \
- checkliveness(G(L),i_o); }
-
-#define setuvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \
- checkliveness(G(L),i_o); }
-
-#define setthvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \
- checkliveness(G(L),i_o); }
-
-#define setclvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION; \
- checkliveness(G(L),i_o); }
-
-#define sethvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \
- checkliveness(G(L),i_o); }
-
-#define setptvalue(L,obj,x) \
- { TValue *i_o=(obj); \
- i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO; \
- checkliveness(G(L),i_o); }
-
-
-
-
-#define setobj(L,obj1,obj2) \
- { const TValue *o2=(obj2); TValue *o1=(obj1); \
- o1->value = o2->value; o1->tt=o2->tt; \
- checkliveness(G(L),o1); }
-
-
-/*
-** different types of sets, according to destination
-*/
-
-/* from stack to (same) stack */
-#define setobjs2s setobj
-/* to stack (not from same stack) */
-#define setobj2s setobj
-#define setsvalue2s setsvalue
-#define sethvalue2s sethvalue
-#define setptvalue2s setptvalue
-/* from table to same table */
-#define setobjt2t setobj
-/* to table */
-#define setobj2t setobj
-/* to new object */
-#define setobj2n setobj
-#define setsvalue2n setsvalue
-
-#define setttype(obj, tt) (ttype(obj) = (tt))
-
-
-#define iscollectable(o) (ttype(o) >= LUA_TSTRING)
-
-
-
-typedef TValue *StkId; /* index to stack elements */
-
-
-/*
-** String headers for string table
-*/
-typedef union TString {
- L_Umaxalign dummy; /* ensures maximum alignment for strings */
- struct {
- CommonHeader;
- lu_byte reserved;
- unsigned int hash;
- size_t len;
- } tsv;
-} TString;
-
-
-#define getstr(ts) cast(const char *, (ts) + 1)
-#define svalue(o) getstr(rawtsvalue(o))
-
-
-
-typedef union Udata {
- L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */
- struct {
- CommonHeader;
- struct Table *metatable;
- struct Table *env;
- size_t len;
- } uv;
-} Udata;
-
-
-
-
-/*
-** Function Prototypes
-*/
-typedef struct Proto {
- CommonHeader;
- TValue *k; /* constants used by the function */
- Instruction *code;
- struct Proto **p; /* functions defined inside the function */
- int *lineinfo; /* map from opcodes to source lines */
- struct LocVar *locvars; /* information about local variables */
- TString **upvalues; /* upvalue names */
- TString *source;
- int sizeupvalues;
- int sizek; /* size of `k' */
- int sizecode;
- int sizelineinfo;
- int sizep; /* size of `p' */
- int sizelocvars;
- int linedefined;
- int lastlinedefined;
- GCObject *gclist;
- lu_byte nups; /* number of upvalues */
- lu_byte numparams;
- lu_byte is_vararg;
- lu_byte maxstacksize;
-} Proto;
-
-
-/* masks for new-style vararg */
-#define VARARG_HASARG 1
-#define VARARG_ISVARARG 2
-#define VARARG_NEEDSARG 4
-
-
-typedef struct LocVar {
- TString *varname;
- int startpc; /* first point where variable is active */
- int endpc; /* first point where variable is dead */
-} LocVar;
-
-
-
-/*
-** Upvalues
-*/
-
-typedef struct UpVal {
- CommonHeader;
- TValue *v; /* points to stack or to its own value */
- union {
- TValue value; /* the value (when closed) */
- struct { /* double linked list (when open) */
- struct UpVal *prev;
- struct UpVal *next;
- } l;
- } u;
-} UpVal;
-
-
-/*
-** Closures
-*/
-
-#define ClosureHeader \
- CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \
- struct Table *env
-
-typedef struct CClosure {
- ClosureHeader;
- lua_CFunction f;
- TValue upvalue[1];
-} CClosure;
-
-
-typedef struct LClosure {
- ClosureHeader;
- struct Proto *p;
- UpVal *upvals[1];
-} LClosure;
-
-
-typedef union Closure {
- CClosure c;
- LClosure l;
-} Closure;
-
-
-#define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC)
-#define isLfunction(o) (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC)
-
-
-/*
-** Tables
-*/
-
-typedef union TKey {
- struct {
- TValuefields;
- struct Node *next; /* for chaining */
- } nk;
- TValue tvk;
-} TKey;
-
-
-typedef struct Node {
- TValue i_val;
- TKey i_key;
-} Node;
-
-
-typedef struct Table {
- CommonHeader;
- lu_byte flags; /* 1<<p means tagmethod(p) is not present */
- lu_byte lsizenode; /* log2 of size of `node' array */
- struct Table *metatable;
- TValue *array; /* array part */
- Node *node;
- Node *lastfree; /* any free position is before this position */
- GCObject *gclist;
- int sizearray; /* size of `array' array */
-} Table;
-
-
-
-/*
-** `module' operation for hashing (size is always a power of 2)
-*/
-#define lmod(s,size) \
- (check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))
-
-
-#define twoto(x) (1<<(x))
-#define sizenode(t) (twoto((t)->lsizenode))
-
-
-#define luaO_nilobject (&luaO_nilobject_)
-
-LUAI_DATA const TValue luaO_nilobject_;
-
-#define ceillog2(x) (luaO_log2((x)-1) + 1)
-
-LUAI_FUNC int luaO_log2 (unsigned int x);
-LUAI_FUNC int luaO_int2fb (unsigned int x);
-LUAI_FUNC int luaO_fb2int (int x);
-LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2);
-LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result);
-LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
- va_list argp);
-LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
-LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lopcodes.c,v 1.37.1.1 2007/12/27 13:02:25 roberto Exp $
-** See Copyright Notice in lua.h
-*/
-
-
-#define lopcodes_c
-#define LUA_CORE
-
-
-#include "lopcodes.h"
-
-
-/* ORDER OP */
-
-const char *const luaP_opnames[NUM_OPCODES+1] = {
- "MOVE",
- "LOADK",
- "LOADBOOL",
- "LOADNIL",
- "GETUPVAL",
- "GETGLOBAL",
- "GETTABLE",
- "SETGLOBAL",
- "SETUPVAL",
- "SETTABLE",
- "NEWTABLE",
- "SELF",
- "ADD",
- "SUB",
- "MUL",
- "DIV",
- "MOD",
- "POW",
- "UNM",
- "NOT",
- "LEN",
- "CONCAT",
- "JMP",
- "EQ",
- "LT",
- "LE",
- "TEST",
- "TESTSET",
- "CALL",
- "TAILCALL",
- "RETURN",
- "FORLOOP",
- "FORPREP",
- "TFORLOOP",
- "SETLIST",
- "CLOSE",
- "CLOSURE",
- "VARARG",
- NULL
-};
-
-
-#define opmode(t,a,b,c,m) (((t)<<7) | ((a)<<6) | ((b)<<4) | ((c)<<2) | (m))
-
-const lu_byte luaP_opmodes[NUM_OPCODES] = {
-/* T A B C mode opcode */
- opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_MOVE */
- ,opmode(0, 1, OpArgK, OpArgN, iABx) /* OP_LOADK */
- ,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_LOADBOOL */
- ,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_LOADNIL */
- ,opmode(0, 1, OpArgU, OpArgN, iABC) /* OP_GETUPVAL */
- ,opmode(0, 1, OpArgK, OpArgN, iABx) /* OP_GETGLOBAL */
- ,opmode(0, 1, OpArgR, OpArgK, iABC) /* OP_GETTABLE */
- ,opmode(0, 0, OpArgK, OpArgN, iABx) /* OP_SETGLOBAL */
- ,opmode(0, 0, OpArgU, OpArgN, iABC) /* OP_SETUPVAL */
- ,opmode(0, 0, OpArgK, OpArgK, iABC) /* OP_SETTABLE */
- ,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_NEWTABLE */
- ,opmode(0, 1, OpArgR, OpArgK, iABC) /* OP_SELF */
- ,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_ADD */
- ,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_SUB */
- ,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_MUL */
- ,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_DIV */
- ,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_MOD */
- ,opmode(0, 1, OpArgK, OpArgK, iABC) /* OP_POW */
- ,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_UNM */
- ,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_NOT */
- ,opmode(0, 1, OpArgR, OpArgN, iABC) /* OP_LEN */
- ,opmode(0, 1, OpArgR, OpArgR, iABC) /* OP_CONCAT */
- ,opmode(0, 0, OpArgR, OpArgN, iAsBx) /* OP_JMP */
- ,opmode(1, 0, OpArgK, OpArgK, iABC) /* OP_EQ */
- ,opmode(1, 0, OpArgK, OpArgK, iABC) /* OP_LT */
- ,opmode(1, 0, OpArgK, OpArgK, iABC) /* OP_LE */
- ,opmode(1, 1, OpArgR, OpArgU, iABC) /* OP_TEST */
- ,opmode(1, 1, OpArgR, OpArgU, iABC) /* OP_TESTSET */
- ,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_CALL */
- ,opmode(0, 1, OpArgU, OpArgU, iABC) /* OP_TAILCALL */
- ,opmode(0, 0, OpArgU, OpArgN, iABC) /* OP_RETURN */
- ,opmode(0, 1, OpArgR, OpArgN, iAsBx) /* OP_FORLOOP */
- ,opmode(0, 1, OpArgR, OpArgN, iAsBx) /* OP_FORPREP */
- ,opmode(1, 0, OpArgN, OpArgU, iABC) /* OP_TFORLOOP */
- ,opmode(0, 0, OpArgU, OpArgU, iABC) /* OP_SETLIST */
- ,opmode(0, 0, OpArgN, OpArgN, iABC) /* OP_CLOSE */
- ,opmode(0, 1, OpArgU, OpArgN, iABx) /* OP_CLOSURE */
- ,opmode(0, 1, OpArgU, OpArgN, iABC) /* OP_VARARG */
-};
+++ /dev/null
-/*
-** $Id: lopcodes.h,v 1.125.1.1 2007/12/27 13:02:25 roberto Exp $
-** Opcodes for Lua virtual machine
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lopcodes_h
-#define lopcodes_h
-
-#include "llimits.h"
-
-
-/*===========================================================================
- We assume that instructions are unsigned numbers.
- All instructions have an opcode in the first 6 bits.
- Instructions can have the following fields:
- `A' : 8 bits
- `B' : 9 bits
- `C' : 9 bits
- `Bx' : 18 bits (`B' and `C' together)
- `sBx' : signed Bx
-
- A signed argument is represented in excess K; that is, the number
- value is the unsigned value minus K. K is exactly the maximum value
- for that argument (so that -max is represented by 0, and +max is
- represented by 2*max), which is half the maximum for the corresponding
- unsigned argument.
-===========================================================================*/
-
-
-enum OpMode {iABC, iABx, iAsBx}; /* basic instruction format */
-
-
-/*
-** size and position of opcode arguments.
-*/
-#define SIZE_C 9
-#define SIZE_B 9
-#define SIZE_Bx (SIZE_C + SIZE_B)
-#define SIZE_A 8
-
-#define SIZE_OP 6
-
-#define POS_OP 0
-#define POS_A (POS_OP + SIZE_OP)
-#define POS_C (POS_A + SIZE_A)
-#define POS_B (POS_C + SIZE_C)
-#define POS_Bx POS_C
-
-
-/*
-** limits for opcode arguments.
-** we use (signed) int to manipulate most arguments,
-** so they must fit in LUAI_BITSINT-1 bits (-1 for sign)
-*/
-#if SIZE_Bx < LUAI_BITSINT-1
-#define MAXARG_Bx ((1<<SIZE_Bx)-1)
-#define MAXARG_sBx (MAXARG_Bx>>1) /* `sBx' is signed */
-#else
-#define MAXARG_Bx MAX_INT
-#define MAXARG_sBx MAX_INT
-#endif
-
-
-#define MAXARG_A ((1<<SIZE_A)-1)
-#define MAXARG_B ((1<<SIZE_B)-1)
-#define MAXARG_C ((1<<SIZE_C)-1)
-
-
-/* creates a mask with `n' 1 bits at position `p' */
-#define MASK1(n,p) ((~((~(Instruction)0)<<n))<<p)
-
-/* creates a mask with `n' 0 bits at position `p' */
-#define MASK0(n,p) (~MASK1(n,p))
-
-/*
-** the following macros help to manipulate instructions
-*/
-
-#define GET_OPCODE(i) (cast(OpCode, ((i)>>POS_OP) & MASK1(SIZE_OP,0)))
-#define SET_OPCODE(i,o) ((i) = (((i)&MASK0(SIZE_OP,POS_OP)) | \
- ((cast(Instruction, o)<<POS_OP)&MASK1(SIZE_OP,POS_OP))))
-
-#define GETARG_A(i) (cast(int, ((i)>>POS_A) & MASK1(SIZE_A,0)))
-#define SETARG_A(i,u) ((i) = (((i)&MASK0(SIZE_A,POS_A)) | \
- ((cast(Instruction, u)<<POS_A)&MASK1(SIZE_A,POS_A))))
-
-#define GETARG_B(i) (cast(int, ((i)>>POS_B) & MASK1(SIZE_B,0)))
-#define SETARG_B(i,b) ((i) = (((i)&MASK0(SIZE_B,POS_B)) | \
- ((cast(Instruction, b)<<POS_B)&MASK1(SIZE_B,POS_B))))
-
-#define GETARG_C(i) (cast(int, ((i)>>POS_C) & MASK1(SIZE_C,0)))
-#define SETARG_C(i,b) ((i) = (((i)&MASK0(SIZE_C,POS_C)) | \
- ((cast(Instruction, b)<<POS_C)&MASK1(SIZE_C,POS_C))))
-
-#define GETARG_Bx(i) (cast(int, ((i)>>POS_Bx) & MASK1(SIZE_Bx,0)))
-#define SETARG_Bx(i,b) ((i) = (((i)&MASK0(SIZE_Bx,POS_Bx)) | \
- ((cast(Instruction, b)<<POS_Bx)&MASK1(SIZE_Bx,POS_Bx))))
-
-#define GETARG_sBx(i) (GETARG_Bx(i)-MAXARG_sBx)
-#define SETARG_sBx(i,b) SETARG_Bx((i),cast(unsigned int, (b)+MAXARG_sBx))
-
-
-#define CREATE_ABC(o,a,b,c) ((cast(Instruction, o)<<POS_OP) \
- | (cast(Instruction, a)<<POS_A) \
- | (cast(Instruction, b)<<POS_B) \
- | (cast(Instruction, c)<<POS_C))
-
-#define CREATE_ABx(o,a,bc) ((cast(Instruction, o)<<POS_OP) \
- | (cast(Instruction, a)<<POS_A) \
- | (cast(Instruction, bc)<<POS_Bx))
-
-
-/*
-** Macros to operate RK indices
-*/
-
-/* this bit 1 means constant (0 means register) */
-#define BITRK (1 << (SIZE_B - 1))
-
-/* test whether value is a constant */
-#define ISK(x) ((x) & BITRK)
-
-/* gets the index of the constant */
-#define INDEXK(r) ((int)(r) & ~BITRK)
-
-#define MAXINDEXRK (BITRK - 1)
-
-/* code a constant index as a RK value */
-#define RKASK(x) ((x) | BITRK)
-
-
-/*
-** invalid register that fits in 8 bits
-*/
-#define NO_REG MAXARG_A
-
-
-/*
-** R(x) - register
-** Kst(x) - constant (in constant table)
-** RK(x) == if ISK(x) then Kst(INDEXK(x)) else R(x)
-*/
-
-
-/*
-** grep "ORDER OP" if you change these enums
-*/
-
-typedef enum {
-/*----------------------------------------------------------------------
-name args description
-------------------------------------------------------------------------*/
-OP_MOVE,/* A B R(A) := R(B) */
-OP_LOADK,/* A Bx R(A) := Kst(Bx) */
-OP_LOADBOOL,/* A B C R(A) := (Bool)B; if (C) pc++ */
-OP_LOADNIL,/* A B R(A) := ... := R(B) := nil */
-OP_GETUPVAL,/* A B R(A) := UpValue[B] */
-
-OP_GETGLOBAL,/* A Bx R(A) := Gbl[Kst(Bx)] */
-OP_GETTABLE,/* A B C R(A) := R(B)[RK(C)] */
-
-OP_SETGLOBAL,/* A Bx Gbl[Kst(Bx)] := R(A) */
-OP_SETUPVAL,/* A B UpValue[B] := R(A) */
-OP_SETTABLE,/* A B C R(A)[RK(B)] := RK(C) */
-
-OP_NEWTABLE,/* A B C R(A) := {} (size = B,C) */
-
-OP_SELF,/* A B C R(A+1) := R(B); R(A) := R(B)[RK(C)] */
-
-OP_ADD,/* A B C R(A) := RK(B) + RK(C) */
-OP_SUB,/* A B C R(A) := RK(B) - RK(C) */
-OP_MUL,/* A B C R(A) := RK(B) * RK(C) */
-OP_DIV,/* A B C R(A) := RK(B) / RK(C) */
-OP_MOD,/* A B C R(A) := RK(B) % RK(C) */
-OP_POW,/* A B C R(A) := RK(B) ^ RK(C) */
-OP_UNM,/* A B R(A) := -R(B) */
-OP_NOT,/* A B R(A) := not R(B) */
-OP_LEN,/* A B R(A) := length of R(B) */
-
-OP_CONCAT,/* A B C R(A) := R(B).. ... ..R(C) */
-
-OP_JMP,/* sBx pc+=sBx */
-
-OP_EQ,/* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */
-OP_LT,/* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */
-OP_LE,/* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */
-
-OP_TEST,/* A C if not (R(A) <=> C) then pc++ */
-OP_TESTSET,/* A B C if (R(B) <=> C) then R(A) := R(B) else pc++ */
-
-OP_CALL,/* A B C R(A), ... ,R(A+C-2) := R(A)(R(A+1), ... ,R(A+B-1)) */
-OP_TAILCALL,/* A B C return R(A)(R(A+1), ... ,R(A+B-1)) */
-OP_RETURN,/* A B return R(A), ... ,R(A+B-2) (see note) */
-
-OP_FORLOOP,/* A sBx R(A)+=R(A+2);
- if R(A) <?= R(A+1) then { pc+=sBx; R(A+3)=R(A) }*/
-OP_FORPREP,/* A sBx R(A)-=R(A+2); pc+=sBx */
-
-OP_TFORLOOP,/* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));
- if R(A+3) ~= nil then R(A+2)=R(A+3) else pc++ */
-OP_SETLIST,/* A B C R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B */
-
-OP_CLOSE,/* A close all variables in the stack up to (>=) R(A)*/
-OP_CLOSURE,/* A Bx R(A) := closure(KPROTO[Bx], R(A), ... ,R(A+n)) */
-
-OP_VARARG/* A B R(A), R(A+1), ..., R(A+B-1) = vararg */
-} OpCode;
-
-
-#define NUM_OPCODES (cast(int, OP_VARARG) + 1)
-
-
-
-/*===========================================================================
- Notes:
- (*) In OP_CALL, if (B == 0) then B = top. C is the number of returns - 1,
- and can be 0: OP_CALL then sets `top' to last_result+1, so
- next open instruction (OP_CALL, OP_RETURN, OP_SETLIST) may use `top'.
-
- (*) In OP_VARARG, if (B == 0) then use actual number of varargs and
- set top (like in OP_CALL with C == 0).
-
- (*) In OP_RETURN, if (B == 0) then return up to `top'
-
- (*) In OP_SETLIST, if (B == 0) then B = `top';
- if (C == 0) then next `instruction' is real C
-
- (*) For comparisons, A specifies what condition the test should accept
- (true or false).
-
- (*) All `skips' (pc++) assume that next instruction is a jump
-===========================================================================*/
-
-
-/*
-** masks for instruction properties. The format is:
-** bits 0-1: op mode
-** bits 2-3: C arg mode
-** bits 4-5: B arg mode
-** bit 6: instruction set register A
-** bit 7: operator is a test
-*/
-
-enum OpArgMask {
- OpArgN, /* argument is not used */
- OpArgU, /* argument is used */
- OpArgR, /* argument is a register or a jump offset */
- OpArgK /* argument is a constant or register/constant */
-};
-
-LUAI_DATA const lu_byte luaP_opmodes[NUM_OPCODES];
-
-#define getOpMode(m) (cast(enum OpMode, luaP_opmodes[m] & 3))
-#define getBMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 4) & 3))
-#define getCMode(m) (cast(enum OpArgMask, (luaP_opmodes[m] >> 2) & 3))
-#define testAMode(m) (luaP_opmodes[m] & (1 << 6))
-#define testTMode(m) (luaP_opmodes[m] & (1 << 7))
-
-
-LUAI_DATA const char *const luaP_opnames[NUM_OPCODES+1]; /* opcode names */
-
-
-/* number of list items to accumulate before a SETLIST instruction */
-#define LFIELDS_PER_FLUSH 50
-
-
-#endif
+++ /dev/null
-/*
-** $Id: loslib.c,v 1.19.1.3 2008/01/18 16:38:18 roberto Exp $
-** Standard Operating System library
-** See Copyright Notice in lua.h
-*/
-
-
-#include <errno.h>
-#include <locale.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#define loslib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-static int os_pushresult (lua_State *L, int i, const char *filename) {
- int en = errno; /* calls to Lua API may change this value */
- if (i) {
- lua_pushboolean(L, 1);
- return 1;
- }
- else {
- lua_pushnil(L);
- lua_pushfstring(L, "%s: %s", filename, strerror(en));
- lua_pushinteger(L, en);
- return 3;
- }
-}
-
-
-static int os_execute (lua_State *L) {
- lua_pushinteger(L, system(luaL_optstring(L, 1, NULL)));
- return 1;
-}
-
-
-static int os_remove (lua_State *L) {
- const char *filename = luaL_checkstring(L, 1);
- return os_pushresult(L, remove(filename) == 0, filename);
-}
-
-
-static int os_rename (lua_State *L) {
- const char *fromname = luaL_checkstring(L, 1);
- const char *toname = luaL_checkstring(L, 2);
- return os_pushresult(L, rename(fromname, toname) == 0, fromname);
-}
-
-
-static int os_tmpname (lua_State *L) {
- char buff[LUA_TMPNAMBUFSIZE];
- int err;
- lua_tmpnam(buff, err);
- if (err)
- return luaL_error(L, "unable to generate a unique filename");
- lua_pushstring(L, buff);
- return 1;
-}
-
-
-static int os_getenv (lua_State *L) {
- lua_pushstring(L, getenv(luaL_checkstring(L, 1))); /* if NULL push nil */
- return 1;
-}
-
-
-static int os_clock (lua_State *L) {
- lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
- return 1;
-}
-
-
-/*
-** {======================================================
-** Time/Date operations
-** { year=%Y, month=%m, day=%d, hour=%H, min=%M, sec=%S,
-** wday=%w+1, yday=%j, isdst=? }
-** =======================================================
-*/
-
-static void setfield (lua_State *L, const char *key, int value) {
- lua_pushinteger(L, value);
- lua_setfield(L, -2, key);
-}
-
-static void setboolfield (lua_State *L, const char *key, int value) {
- if (value < 0) /* undefined? */
- return; /* does not set field */
- lua_pushboolean(L, value);
- lua_setfield(L, -2, key);
-}
-
-static int getboolfield (lua_State *L, const char *key) {
- int res;
- lua_getfield(L, -1, key);
- res = lua_isnil(L, -1) ? -1 : lua_toboolean(L, -1);
- lua_pop(L, 1);
- return res;
-}
-
-
-static int getfield (lua_State *L, const char *key, int d) {
- int res;
- lua_getfield(L, -1, key);
- if (lua_isnumber(L, -1))
- res = (int)lua_tointeger(L, -1);
- else {
- if (d < 0)
- return luaL_error(L, "field " LUA_QS " missing in date table", key);
- res = d;
- }
- lua_pop(L, 1);
- return res;
-}
-
-
-static int os_date (lua_State *L) {
- const char *s = luaL_optstring(L, 1, "%c");
- time_t t = luaL_opt(L, (time_t)luaL_checknumber, 2, time(NULL));
- struct tm *stm;
- if (*s == '!') { /* UTC? */
- stm = gmtime(&t);
- s++; /* skip `!' */
- }
- else
- stm = localtime(&t);
- if (stm == NULL) /* invalid date? */
- lua_pushnil(L);
- else if (strcmp(s, "*t") == 0) {
- lua_createtable(L, 0, 9); /* 9 = number of fields */
- setfield(L, "sec", stm->tm_sec);
- setfield(L, "min", stm->tm_min);
- setfield(L, "hour", stm->tm_hour);
- setfield(L, "day", stm->tm_mday);
- setfield(L, "month", stm->tm_mon+1);
- setfield(L, "year", stm->tm_year+1900);
- setfield(L, "wday", stm->tm_wday+1);
- setfield(L, "yday", stm->tm_yday+1);
- setboolfield(L, "isdst", stm->tm_isdst);
- }
- else {
- char cc[3];
- luaL_Buffer b;
- cc[0] = '%'; cc[2] = '\0';
- luaL_buffinit(L, &b);
- for (; *s; s++) {
- if (*s != '%' || *(s + 1) == '\0') /* no conversion specifier? */
- luaL_addchar(&b, *s);
- else {
- size_t reslen;
- char buff[200]; /* should be big enough for any conversion result */
- cc[1] = *(++s);
- reslen = strftime(buff, sizeof(buff), cc, stm);
- luaL_addlstring(&b, buff, reslen);
- }
- }
- luaL_pushresult(&b);
- }
- return 1;
-}
-
-
-static int os_time (lua_State *L) {
- time_t t;
- if (lua_isnoneornil(L, 1)) /* called without args? */
- t = time(NULL); /* get current time */
- else {
- struct tm ts;
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_settop(L, 1); /* make sure table is at the top */
- ts.tm_sec = getfield(L, "sec", 0);
- ts.tm_min = getfield(L, "min", 0);
- ts.tm_hour = getfield(L, "hour", 12);
- ts.tm_mday = getfield(L, "day", -1);
- ts.tm_mon = getfield(L, "month", -1) - 1;
- ts.tm_year = getfield(L, "year", -1) - 1900;
- ts.tm_isdst = getboolfield(L, "isdst");
- t = mktime(&ts);
- }
- if (t == (time_t)(-1))
- lua_pushnil(L);
- else
- lua_pushnumber(L, (lua_Number)t);
- return 1;
-}
-
-
-static int os_difftime (lua_State *L) {
- lua_pushnumber(L, difftime((time_t)(luaL_checknumber(L, 1)),
- (time_t)(luaL_optnumber(L, 2, 0))));
- return 1;
-}
-
-/* }====================================================== */
-
-
-static int os_setlocale (lua_State *L) {
- static const int cat[] = {LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY,
- LC_NUMERIC, LC_TIME};
- static const char *const catnames[] = {"all", "collate", "ctype", "monetary",
- "numeric", "time", NULL};
- const char *l = luaL_optstring(L, 1, NULL);
- int op = luaL_checkoption(L, 2, "all", catnames);
- lua_pushstring(L, setlocale(cat[op], l));
- return 1;
-}
-
-
-static int os_exit (lua_State *L) {
- exit(luaL_optint(L, 1, EXIT_SUCCESS));
-}
-
-static const luaL_Reg syslib[] = {
- {"clock", os_clock},
- {"date", os_date},
- {"difftime", os_difftime},
- {"execute", os_execute},
- {"exit", os_exit},
- {"getenv", os_getenv},
- {"remove", os_remove},
- {"rename", os_rename},
- {"setlocale", os_setlocale},
- {"time", os_time},
- {"tmpname", os_tmpname},
- {NULL, NULL}
-};
-
-/* }====================================================== */
-
-
-
-LUALIB_API int luaopen_os (lua_State *L) {
- luaL_register(L, LUA_OSLIBNAME, syslib);
- return 1;
-}
+++ /dev/null
-/*
-** $Id: lparser.c,v 2.42.1.3 2007/12/28 15:32:23 roberto Exp $
-** Lua Parser
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define lparser_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lcode.h"
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "llex.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lparser.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-
-
-
-#define hasmultret(k) ((k) == VCALL || (k) == VVARARG)
-
-#define getlocvar(fs, i) ((fs)->f->locvars[(fs)->actvar[i]])
-
-#define luaY_checklimit(fs,v,l,m) if ((v)>(l)) errorlimit(fs,l,m)
-
-
-/*
-** nodes for block list (list of active blocks)
-*/
-typedef struct BlockCnt {
- struct BlockCnt *previous; /* chain */
- int breaklist; /* list of jumps out of this loop */
- lu_byte nactvar; /* # active locals outside the breakable structure */
- lu_byte upval; /* true if some variable in the block is an upvalue */
- lu_byte isbreakable; /* true if `block' is a loop */
-} BlockCnt;
-
-
-
-/*
-** prototypes for recursive non-terminal functions
-*/
-static void chunk (LexState *ls);
-static void expr (LexState *ls, expdesc *v);
-
-
-static void anchor_token (LexState *ls) {
- if (ls->t.token == TK_NAME || ls->t.token == TK_STRING) {
- TString *ts = ls->t.seminfo.ts;
- luaX_newstring(ls, getstr(ts), ts->tsv.len);
- }
-}
-
-
-static void error_expected (LexState *ls, int token) {
- luaX_syntaxerror(ls,
- luaO_pushfstring(ls->L, LUA_QS " expected", luaX_token2str(ls, token)));
-}
-
-
-static void errorlimit (FuncState *fs, int limit, const char *what) {
- const char *msg = (fs->f->linedefined == 0) ?
- luaO_pushfstring(fs->L, "main function has more than %d %s", limit, what) :
- luaO_pushfstring(fs->L, "function at line %d has more than %d %s",
- fs->f->linedefined, limit, what);
- luaX_lexerror(fs->ls, msg, 0);
-}
-
-
-static int testnext (LexState *ls, int c) {
- if (ls->t.token == c) {
- luaX_next(ls);
- return 1;
- }
- else return 0;
-}
-
-
-static void check (LexState *ls, int c) {
- if (ls->t.token != c)
- error_expected(ls, c);
-}
-
-static void checknext (LexState *ls, int c) {
- check(ls, c);
- luaX_next(ls);
-}
-
-
-#define check_condition(ls,c,msg) { if (!(c)) luaX_syntaxerror(ls, msg); }
-
-
-
-static void check_match (LexState *ls, int what, int who, int where) {
- if (!testnext(ls, what)) {
- if (where == ls->linenumber)
- error_expected(ls, what);
- else {
- luaX_syntaxerror(ls, luaO_pushfstring(ls->L,
- LUA_QS " expected (to close " LUA_QS " at line %d)",
- luaX_token2str(ls, what), luaX_token2str(ls, who), where));
- }
- }
-}
-
-
-static TString *str_checkname (LexState *ls) {
- TString *ts;
- check(ls, TK_NAME);
- ts = ls->t.seminfo.ts;
- luaX_next(ls);
- return ts;
-}
-
-
-static void init_exp (expdesc *e, expkind k, int i) {
- e->f = e->t = NO_JUMP;
- e->k = k;
- e->u.s.info = i;
-}
-
-
-static void codestring (LexState *ls, expdesc *e, TString *s) {
- init_exp(e, VK, luaK_stringK(ls->fs, s));
-}
-
-
-static void checkname(LexState *ls, expdesc *e) {
- codestring(ls, e, str_checkname(ls));
-}
-
-
-static int registerlocalvar (LexState *ls, TString *varname) {
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- int oldsize = f->sizelocvars;
- luaM_growvector(ls->L, f->locvars, fs->nlocvars, f->sizelocvars,
- LocVar, SHRT_MAX, "too many local variables");
- while (oldsize < f->sizelocvars) f->locvars[oldsize++].varname = NULL;
- f->locvars[fs->nlocvars].varname = varname;
- luaC_objbarrier(ls->L, f, varname);
- return fs->nlocvars++;
-}
-
-
-#define new_localvarliteral(ls,v,n) \
- new_localvar(ls, luaX_newstring(ls, "" v, (sizeof(v)/sizeof(char))-1), n)
-
-
-static void new_localvar (LexState *ls, TString *name, int n) {
- FuncState *fs = ls->fs;
- luaY_checklimit(fs, fs->nactvar+n+1, LUAI_MAXVARS, "local variables");
- fs->actvar[fs->nactvar+n] = cast(unsigned short, registerlocalvar(ls, name));
-}
-
-
-static void adjustlocalvars (LexState *ls, int nvars) {
- FuncState *fs = ls->fs;
- fs->nactvar = cast_byte(fs->nactvar + nvars);
- for (; nvars; nvars--) {
- getlocvar(fs, fs->nactvar - nvars).startpc = fs->pc;
- }
-}
-
-
-static void removevars (LexState *ls, int tolevel) {
- FuncState *fs = ls->fs;
- while (fs->nactvar > tolevel)
- getlocvar(fs, --fs->nactvar).endpc = fs->pc;
-}
-
-
-static int indexupvalue (FuncState *fs, TString *name, expdesc *v) {
- int i;
- Proto *f = fs->f;
- int oldsize = f->sizeupvalues;
- for (i=0; i<f->nups; i++) {
- if (fs->upvalues[i].k == v->k && fs->upvalues[i].info == v->u.s.info) {
- lua_assert(f->upvalues[i] == name);
- return i;
- }
- }
- /* new one */
- luaY_checklimit(fs, f->nups + 1, LUAI_MAXUPVALUES, "upvalues");
- luaM_growvector(fs->L, f->upvalues, f->nups, f->sizeupvalues,
- TString *, MAX_INT, "");
- while (oldsize < f->sizeupvalues) f->upvalues[oldsize++] = NULL;
- f->upvalues[f->nups] = name;
- luaC_objbarrier(fs->L, f, name);
- lua_assert(v->k == VLOCAL || v->k == VUPVAL);
- fs->upvalues[f->nups].k = cast_byte(v->k);
- fs->upvalues[f->nups].info = cast_byte(v->u.s.info);
- return f->nups++;
-}
-
-
-static int searchvar (FuncState *fs, TString *n) {
- int i;
- for (i=fs->nactvar-1; i >= 0; i--) {
- if (n == getlocvar(fs, i).varname)
- return i;
- }
- return -1; /* not found */
-}
-
-
-static void markupval (FuncState *fs, int level) {
- BlockCnt *bl = fs->bl;
- while (bl && bl->nactvar > level) bl = bl->previous;
- if (bl) bl->upval = 1;
-}
-
-
-static int singlevaraux (FuncState *fs, TString *n, expdesc *var, int base) {
- if (fs == NULL) { /* no more levels? */
- init_exp(var, VGLOBAL, NO_REG); /* default is global variable */
- return VGLOBAL;
- }
- else {
- int v = searchvar(fs, n); /* look up at current level */
- if (v >= 0) {
- init_exp(var, VLOCAL, v);
- if (!base)
- markupval(fs, v); /* local will be used as an upval */
- return VLOCAL;
- }
- else { /* not found at current level; try upper one */
- if (singlevaraux(fs->prev, n, var, 0) == VGLOBAL)
- return VGLOBAL;
- var->u.s.info = indexupvalue(fs, n, var); /* else was LOCAL or UPVAL */
- var->k = VUPVAL; /* upvalue in this level */
- return VUPVAL;
- }
- }
-}
-
-
-static void singlevar (LexState *ls, expdesc *var) {
- TString *varname = str_checkname(ls);
- FuncState *fs = ls->fs;
- if (singlevaraux(fs, varname, var, 1) == VGLOBAL)
- var->u.s.info = luaK_stringK(fs, varname); /* info points to global name */
-}
-
-
-static void adjust_assign (LexState *ls, int nvars, int nexps, expdesc *e) {
- FuncState *fs = ls->fs;
- int extra = nvars - nexps;
- if (hasmultret(e->k)) {
- extra++; /* includes call itself */
- if (extra < 0) extra = 0;
- luaK_setreturns(fs, e, extra); /* last exp. provides the difference */
- if (extra > 1) luaK_reserveregs(fs, extra-1);
- }
- else {
- if (e->k != VVOID) luaK_exp2nextreg(fs, e); /* close last expression */
- if (extra > 0) {
- int reg = fs->freereg;
- luaK_reserveregs(fs, extra);
- luaK_nil(fs, reg, extra);
- }
- }
-}
-
-
-static void enterlevel (LexState *ls) {
- if (++ls->L->nCcalls > LUAI_MAXCCALLS)
- luaX_lexerror(ls, "chunk has too many syntax levels", 0);
-}
-
-
-#define leavelevel(ls) ((ls)->L->nCcalls--)
-
-
-static void enterblock (FuncState *fs, BlockCnt *bl, lu_byte isbreakable) {
- bl->breaklist = NO_JUMP;
- bl->isbreakable = isbreakable;
- bl->nactvar = fs->nactvar;
- bl->upval = 0;
- bl->previous = fs->bl;
- fs->bl = bl;
- lua_assert(fs->freereg == fs->nactvar);
-}
-
-
-static void leaveblock (FuncState *fs) {
- BlockCnt *bl = fs->bl;
- fs->bl = bl->previous;
- removevars(fs->ls, bl->nactvar);
- if (bl->upval)
- luaK_codeABC(fs, OP_CLOSE, bl->nactvar, 0, 0);
- /* a block either controls scope or breaks (never both) */
- lua_assert(!bl->isbreakable || !bl->upval);
- lua_assert(bl->nactvar == fs->nactvar);
- fs->freereg = fs->nactvar; /* free registers */
- luaK_patchtohere(fs, bl->breaklist);
-}
-
-
-static void pushclosure (LexState *ls, FuncState *func, expdesc *v) {
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- int oldsize = f->sizep;
- int i;
- luaM_growvector(ls->L, f->p, fs->np, f->sizep, Proto *,
- MAXARG_Bx, "constant table overflow");
- while (oldsize < f->sizep) f->p[oldsize++] = NULL;
- f->p[fs->np++] = func->f;
- luaC_objbarrier(ls->L, f, func->f);
- init_exp(v, VRELOCABLE, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np-1));
- for (i=0; i<func->f->nups; i++) {
- OpCode o = (func->upvalues[i].k == VLOCAL) ? OP_MOVE : OP_GETUPVAL;
- luaK_codeABC(fs, o, 0, func->upvalues[i].info, 0);
- }
-}
-
-
-static void open_func (LexState *ls, FuncState *fs) {
- lua_State *L = ls->L;
- Proto *f = luaF_newproto(L);
- fs->f = f;
- fs->prev = ls->fs; /* linked list of funcstates */
- fs->ls = ls;
- fs->L = L;
- ls->fs = fs;
- fs->pc = 0;
- fs->lasttarget = -1;
- fs->jpc = NO_JUMP;
- fs->freereg = 0;
- fs->nk = 0;
- fs->np = 0;
- fs->nlocvars = 0;
- fs->nactvar = 0;
- fs->bl = NULL;
- f->source = ls->source;
- f->maxstacksize = 2; /* registers 0/1 are always valid */
- fs->h = luaH_new(L, 0, 0);
- /* anchor table of constants and prototype (to avoid being collected) */
- sethvalue2s(L, L->top, fs->h);
- incr_top(L);
- setptvalue2s(L, L->top, f);
- incr_top(L);
-}
-
-
-static void close_func (LexState *ls) {
- lua_State *L = ls->L;
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- removevars(ls, 0);
- luaK_ret(fs, 0, 0); /* final return */
- luaM_reallocvector(L, f->code, f->sizecode, fs->pc, Instruction);
- f->sizecode = fs->pc;
- luaM_reallocvector(L, f->lineinfo, f->sizelineinfo, fs->pc, int);
- f->sizelineinfo = fs->pc;
- luaM_reallocvector(L, f->k, f->sizek, fs->nk, TValue);
- f->sizek = fs->nk;
- luaM_reallocvector(L, f->p, f->sizep, fs->np, Proto *);
- f->sizep = fs->np;
- luaM_reallocvector(L, f->locvars, f->sizelocvars, fs->nlocvars, LocVar);
- f->sizelocvars = fs->nlocvars;
- luaM_reallocvector(L, f->upvalues, f->sizeupvalues, f->nups, TString *);
- f->sizeupvalues = f->nups;
- lua_assert(luaG_checkcode(f));
- lua_assert(fs->bl == NULL);
- ls->fs = fs->prev;
- L->top -= 2; /* remove table and prototype from the stack */
- /* last token read was anchored in defunct function; must reanchor it */
- if (fs) anchor_token(ls);
-}
-
-
-Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, const char *name) {
- struct LexState lexstate;
- struct FuncState funcstate;
- lexstate.buff = buff;
- luaX_setinput(L, &lexstate, z, luaS_new(L, name));
- open_func(&lexstate, &funcstate);
- funcstate.f->is_vararg = VARARG_ISVARARG; /* main func. is always vararg */
- luaX_next(&lexstate); /* read first token */
- chunk(&lexstate);
- check(&lexstate, TK_EOS);
- close_func(&lexstate);
- lua_assert(funcstate.prev == NULL);
- lua_assert(funcstate.f->nups == 0);
- lua_assert(lexstate.fs == NULL);
- return funcstate.f;
-}
-
-
-
-/*============================================================*/
-/* GRAMMAR RULES */
-/*============================================================*/
-
-
-static void field (LexState *ls, expdesc *v) {
- /* field -> ['.' | ':'] NAME */
- FuncState *fs = ls->fs;
- expdesc key;
- luaK_exp2anyreg(fs, v);
- luaX_next(ls); /* skip the dot or colon */
- checkname(ls, &key);
- luaK_indexed(fs, v, &key);
-}
-
-
-static void yindex (LexState *ls, expdesc *v) {
- /* index -> '[' expr ']' */
- luaX_next(ls); /* skip the '[' */
- expr(ls, v);
- luaK_exp2val(ls->fs, v);
- checknext(ls, ']');
-}
-
-
-/*
-** {======================================================================
-** Rules for Constructors
-** =======================================================================
-*/
-
-
-struct ConsControl {
- expdesc v; /* last list item read */
- expdesc *t; /* table descriptor */
- int nh; /* total number of `record' elements */
- int na; /* total number of array elements */
- int tostore; /* number of array elements pending to be stored */
-};
-
-
-static void recfield (LexState *ls, struct ConsControl *cc) {
- /* recfield -> (NAME | `['exp1`]') = exp1 */
- FuncState *fs = ls->fs;
- int reg = ls->fs->freereg;
- expdesc key, val;
- int rkkey;
- if (ls->t.token == TK_NAME) {
- luaY_checklimit(fs, cc->nh, MAX_INT, "items in a constructor");
- checkname(ls, &key);
- }
- else /* ls->t.token == '[' */
- yindex(ls, &key);
- cc->nh++;
- checknext(ls, '=');
- rkkey = luaK_exp2RK(fs, &key);
- expr(ls, &val);
- luaK_codeABC(fs, OP_SETTABLE, cc->t->u.s.info, rkkey, luaK_exp2RK(fs, &val));
- fs->freereg = reg; /* free registers */
-}
-
-
-static void closelistfield (FuncState *fs, struct ConsControl *cc) {
- if (cc->v.k == VVOID) return; /* there is no list item */
- luaK_exp2nextreg(fs, &cc->v);
- cc->v.k = VVOID;
- if (cc->tostore == LFIELDS_PER_FLUSH) {
- luaK_setlist(fs, cc->t->u.s.info, cc->na, cc->tostore); /* flush */
- cc->tostore = 0; /* no more items pending */
- }
-}
-
-
-static void lastlistfield (FuncState *fs, struct ConsControl *cc) {
- if (cc->tostore == 0) return;
- if (hasmultret(cc->v.k)) {
- luaK_setmultret(fs, &cc->v);
- luaK_setlist(fs, cc->t->u.s.info, cc->na, LUA_MULTRET);
- cc->na--; /* do not count last expression (unknown number of elements) */
- }
- else {
- if (cc->v.k != VVOID)
- luaK_exp2nextreg(fs, &cc->v);
- luaK_setlist(fs, cc->t->u.s.info, cc->na, cc->tostore);
- }
-}
-
-
-static void listfield (LexState *ls, struct ConsControl *cc) {
- expr(ls, &cc->v);
- luaY_checklimit(ls->fs, cc->na, MAX_INT, "items in a constructor");
- cc->na++;
- cc->tostore++;
-}
-
-
-static void constructor (LexState *ls, expdesc *t) {
- /* constructor -> ?? */
- FuncState *fs = ls->fs;
- int line = ls->linenumber;
- int pc = luaK_codeABC(fs, OP_NEWTABLE, 0, 0, 0);
- struct ConsControl cc;
- cc.na = cc.nh = cc.tostore = 0;
- cc.t = t;
- init_exp(t, VRELOCABLE, pc);
- init_exp(&cc.v, VVOID, 0); /* no value (yet) */
- luaK_exp2nextreg(ls->fs, t); /* fix it at stack top (for gc) */
- checknext(ls, '{');
- do {
- lua_assert(cc.v.k == VVOID || cc.tostore > 0);
- if (ls->t.token == '}') break;
- closelistfield(fs, &cc);
- switch(ls->t.token) {
- case TK_NAME: { /* may be listfields or recfields */
- luaX_lookahead(ls);
- if (ls->lookahead.token != '=') /* expression? */
- listfield(ls, &cc);
- else
- recfield(ls, &cc);
- break;
- }
- case '[': { /* constructor_item -> recfield */
- recfield(ls, &cc);
- break;
- }
- default: { /* constructor_part -> listfield */
- listfield(ls, &cc);
- break;
- }
- }
- } while (testnext(ls, ',') || testnext(ls, ';'));
- check_match(ls, '}', '{', line);
- lastlistfield(fs, &cc);
- SETARG_B(fs->f->code[pc], luaO_int2fb(cc.na)); /* set initial array size */
- SETARG_C(fs->f->code[pc], luaO_int2fb(cc.nh)); /* set initial table size */
-}
-
-/* }====================================================================== */
-
-
-
-static void parlist (LexState *ls) {
- /* parlist -> [ param { `,' param } ] */
- FuncState *fs = ls->fs;
- Proto *f = fs->f;
- int nparams = 0;
- f->is_vararg = 0;
- if (ls->t.token != ')') { /* is `parlist' not empty? */
- do {
- switch (ls->t.token) {
- case TK_NAME: { /* param -> NAME */
- new_localvar(ls, str_checkname(ls), nparams++);
- break;
- }
- case TK_DOTS: { /* param -> `...' */
- luaX_next(ls);
-#if defined(LUA_COMPAT_VARARG)
- /* use `arg' as default name */
- new_localvarliteral(ls, "arg", nparams++);
- f->is_vararg = VARARG_HASARG | VARARG_NEEDSARG;
-#endif
- f->is_vararg |= VARARG_ISVARARG;
- break;
- }
- default: luaX_syntaxerror(ls, "<name> or " LUA_QL("...") " expected");
- }
- } while (!f->is_vararg && testnext(ls, ','));
- }
- adjustlocalvars(ls, nparams);
- f->numparams = cast_byte(fs->nactvar - (f->is_vararg & VARARG_HASARG));
- luaK_reserveregs(fs, fs->nactvar); /* reserve register for parameters */
-}
-
-
-static void body (LexState *ls, expdesc *e, int needself, int line) {
- /* body -> `(' parlist `)' chunk END */
- FuncState new_fs;
- open_func(ls, &new_fs);
- new_fs.f->linedefined = line;
- checknext(ls, '(');
- if (needself) {
- new_localvarliteral(ls, "self", 0);
- adjustlocalvars(ls, 1);
- }
- parlist(ls);
- checknext(ls, ')');
- chunk(ls);
- new_fs.f->lastlinedefined = ls->linenumber;
- check_match(ls, TK_END, TK_FUNCTION, line);
- close_func(ls);
- pushclosure(ls, &new_fs, e);
-}
-
-
-static int explist1 (LexState *ls, expdesc *v) {
- /* explist1 -> expr { `,' expr } */
- int n = 1; /* at least one expression */
- expr(ls, v);
- while (testnext(ls, ',')) {
- luaK_exp2nextreg(ls->fs, v);
- expr(ls, v);
- n++;
- }
- return n;
-}
-
-
-static void funcargs (LexState *ls, expdesc *f) {
- FuncState *fs = ls->fs;
- expdesc args;
- int base, nparams;
- int line = ls->linenumber;
- switch (ls->t.token) {
- case '(': { /* funcargs -> `(' [ explist1 ] `)' */
- if (line != ls->lastline)
- luaX_syntaxerror(ls,"ambiguous syntax (function call x new statement)");
- luaX_next(ls);
- if (ls->t.token == ')') /* arg list is empty? */
- args.k = VVOID;
- else {
- explist1(ls, &args);
- luaK_setmultret(fs, &args);
- }
- check_match(ls, ')', '(', line);
- break;
- }
- case '{': { /* funcargs -> constructor */
- constructor(ls, &args);
- break;
- }
- case TK_STRING: { /* funcargs -> STRING */
- codestring(ls, &args, ls->t.seminfo.ts);
- luaX_next(ls); /* must use `seminfo' before `next' */
- break;
- }
- default: {
- luaX_syntaxerror(ls, "function arguments expected");
- return;
- }
- }
- lua_assert(f->k == VNONRELOC);
- base = f->u.s.info; /* base register for call */
- if (hasmultret(args.k))
- nparams = LUA_MULTRET; /* open call */
- else {
- if (args.k != VVOID)
- luaK_exp2nextreg(fs, &args); /* close last argument */
- nparams = fs->freereg - (base+1);
- }
- init_exp(f, VCALL, luaK_codeABC(fs, OP_CALL, base, nparams+1, 2));
- luaK_fixline(fs, line);
- fs->freereg = base+1; /* call remove function and arguments and leaves
- (unless changed) one result */
-}
-
-
-
-
-/*
-** {======================================================================
-** Expression parsing
-** =======================================================================
-*/
-
-
-static void prefixexp (LexState *ls, expdesc *v) {
- /* prefixexp -> NAME | '(' expr ')' */
- switch (ls->t.token) {
- case '(': {
- int line = ls->linenumber;
- luaX_next(ls);
- expr(ls, v);
- check_match(ls, ')', '(', line);
- luaK_dischargevars(ls->fs, v);
- return;
- }
- case TK_NAME: {
- singlevar(ls, v);
- return;
- }
- default: {
- luaX_syntaxerror(ls, "unexpected symbol");
- return;
- }
- }
-}
-
-
-static void primaryexp (LexState *ls, expdesc *v) {
- /* primaryexp ->
- prefixexp { `.' NAME | `[' exp `]' | `:' NAME funcargs | funcargs } */
- FuncState *fs = ls->fs;
- prefixexp(ls, v);
- for (;;) {
- switch (ls->t.token) {
- case '.': { /* field */
- field(ls, v);
- break;
- }
- case '[': { /* `[' exp1 `]' */
- expdesc key;
- luaK_exp2anyreg(fs, v);
- yindex(ls, &key);
- luaK_indexed(fs, v, &key);
- break;
- }
- case ':': { /* `:' NAME funcargs */
- expdesc key;
- luaX_next(ls);
- checkname(ls, &key);
- luaK_self(fs, v, &key);
- funcargs(ls, v);
- break;
- }
- case '(': case TK_STRING: case '{': { /* funcargs */
- luaK_exp2nextreg(fs, v);
- funcargs(ls, v);
- break;
- }
- default: return;
- }
- }
-}
-
-
-static void simpleexp (LexState *ls, expdesc *v) {
- /* simpleexp -> NUMBER | STRING | NIL | true | false | ... |
- constructor | FUNCTION body | primaryexp */
- switch (ls->t.token) {
- case TK_NUMBER: {
- init_exp(v, VKNUM, 0);
- v->u.nval = ls->t.seminfo.r;
- break;
- }
- case TK_STRING: {
- codestring(ls, v, ls->t.seminfo.ts);
- break;
- }
- case TK_NIL: {
- init_exp(v, VNIL, 0);
- break;
- }
- case TK_TRUE: {
- init_exp(v, VTRUE, 0);
- break;
- }
- case TK_FALSE: {
- init_exp(v, VFALSE, 0);
- break;
- }
- case TK_DOTS: { /* vararg */
- FuncState *fs = ls->fs;
- check_condition(ls, fs->f->is_vararg,
- "cannot use " LUA_QL("...") " outside a vararg function");
- fs->f->is_vararg &= ~VARARG_NEEDSARG; /* don't need 'arg' */
- init_exp(v, VVARARG, luaK_codeABC(fs, OP_VARARG, 0, 1, 0));
- break;
- }
- case '{': { /* constructor */
- constructor(ls, v);
- return;
- }
- case TK_FUNCTION: {
- luaX_next(ls);
- body(ls, v, 0, ls->linenumber);
- return;
- }
- default: {
- primaryexp(ls, v);
- return;
- }
- }
- luaX_next(ls);
-}
-
-
-static UnOpr getunopr (int op) {
- switch (op) {
- case TK_NOT: return OPR_NOT;
- case '-': return OPR_MINUS;
- case '#': return OPR_LEN;
- default: return OPR_NOUNOPR;
- }
-}
-
-
-static BinOpr getbinopr (int op) {
- switch (op) {
- case '+': return OPR_ADD;
- case '-': return OPR_SUB;
- case '*': return OPR_MUL;
- case '/': return OPR_DIV;
- case '%': return OPR_MOD;
- case '^': return OPR_POW;
- case TK_CONCAT: return OPR_CONCAT;
- case TK_NE: return OPR_NE;
- case TK_EQ: return OPR_EQ;
- case '<': return OPR_LT;
- case TK_LE: return OPR_LE;
- case '>': return OPR_GT;
- case TK_GE: return OPR_GE;
- case TK_AND: return OPR_AND;
- case TK_OR: return OPR_OR;
- default: return OPR_NOBINOPR;
- }
-}
-
-
-static const struct {
- lu_byte left; /* left priority for each binary operator */
- lu_byte right; /* right priority */
-} priority[] = { /* ORDER OPR */
- {6, 6}, {6, 6}, {7, 7}, {7, 7}, {7, 7}, /* `+' `-' `/' `%' */
- {10, 9}, {5, 4}, /* power and concat (right associative) */
- {3, 3}, {3, 3}, /* equality and inequality */
- {3, 3}, {3, 3}, {3, 3}, {3, 3}, /* order */
- {2, 2}, {1, 1} /* logical (and/or) */
-};
-
-#define UNARY_PRIORITY 8 /* priority for unary operators */
-
-
-/*
-** subexpr -> (simpleexp | unop subexpr) { binop subexpr }
-** where `binop' is any binary operator with a priority higher than `limit'
-*/
-static BinOpr subexpr (LexState *ls, expdesc *v, unsigned int limit) {
- BinOpr op;
- UnOpr uop;
- enterlevel(ls);
- uop = getunopr(ls->t.token);
- if (uop != OPR_NOUNOPR) {
- luaX_next(ls);
- subexpr(ls, v, UNARY_PRIORITY);
- luaK_prefix(ls->fs, uop, v);
- }
- else simpleexp(ls, v);
- /* expand while operators have priorities higher than `limit' */
- op = getbinopr(ls->t.token);
- while (op != OPR_NOBINOPR && priority[op].left > limit) {
- expdesc v2;
- BinOpr nextop;
- luaX_next(ls);
- luaK_infix(ls->fs, op, v);
- /* read sub-expression with higher priority */
- nextop = subexpr(ls, &v2, priority[op].right);
- luaK_posfix(ls->fs, op, v, &v2);
- op = nextop;
- }
- leavelevel(ls);
- return op; /* return first untreated operator */
-}
-
-
-static void expr (LexState *ls, expdesc *v) {
- subexpr(ls, v, 0);
-}
-
-/* }==================================================================== */
-
-
-
-/*
-** {======================================================================
-** Rules for Statements
-** =======================================================================
-*/
-
-
-static int block_follow (int token) {
- switch (token) {
- case TK_ELSE: case TK_ELSEIF: case TK_END:
- case TK_UNTIL: case TK_EOS:
- return 1;
- default: return 0;
- }
-}
-
-
-static void block (LexState *ls) {
- /* block -> chunk */
- FuncState *fs = ls->fs;
- BlockCnt bl;
- enterblock(fs, &bl, 0);
- chunk(ls);
- lua_assert(bl.breaklist == NO_JUMP);
- leaveblock(fs);
-}
-
-
-/*
-** structure to chain all variables in the left-hand side of an
-** assignment
-*/
-struct LHS_assign {
- struct LHS_assign *prev;
- expdesc v; /* variable (global, local, upvalue, or indexed) */
-};
-
-
-/*
-** check whether, in an assignment to a local variable, the local variable
-** is needed in a previous assignment (to a table). If so, save original
-** local value in a safe place and use this safe copy in the previous
-** assignment.
-*/
-static void check_conflict (LexState *ls, struct LHS_assign *lh, expdesc *v) {
- FuncState *fs = ls->fs;
- int extra = fs->freereg; /* eventual position to save local variable */
- int conflict = 0;
- for (; lh; lh = lh->prev) {
- if (lh->v.k == VINDEXED) {
- if (lh->v.u.s.info == v->u.s.info) { /* conflict? */
- conflict = 1;
- lh->v.u.s.info = extra; /* previous assignment will use safe copy */
- }
- if (lh->v.u.s.aux == v->u.s.info) { /* conflict? */
- conflict = 1;
- lh->v.u.s.aux = extra; /* previous assignment will use safe copy */
- }
- }
- }
- if (conflict) {
- luaK_codeABC(fs, OP_MOVE, fs->freereg, v->u.s.info, 0); /* make copy */
- luaK_reserveregs(fs, 1);
- }
-}
-
-
-static void assignment (LexState *ls, struct LHS_assign *lh, int nvars) {
- expdesc e;
- check_condition(ls, VLOCAL <= lh->v.k && lh->v.k <= VINDEXED,
- "syntax error");
- if (testnext(ls, ',')) { /* assignment -> `,' primaryexp assignment */
- struct LHS_assign nv;
- nv.prev = lh;
- primaryexp(ls, &nv.v);
- if (nv.v.k == VLOCAL)
- check_conflict(ls, lh, &nv.v);
- luaY_checklimit(ls->fs, nvars, LUAI_MAXCCALLS - ls->L->nCcalls,
- "variables in assignment");
- assignment(ls, &nv, nvars+1);
- }
- else { /* assignment -> `=' explist1 */
- int nexps;
- checknext(ls, '=');
- nexps = explist1(ls, &e);
- if (nexps != nvars) {
- adjust_assign(ls, nvars, nexps, &e);
- if (nexps > nvars)
- ls->fs->freereg -= nexps - nvars; /* remove extra values */
- }
- else {
- luaK_setoneret(ls->fs, &e); /* close last expression */
- luaK_storevar(ls->fs, &lh->v, &e);
- return; /* avoid default */
- }
- }
- init_exp(&e, VNONRELOC, ls->fs->freereg-1); /* default assignment */
- luaK_storevar(ls->fs, &lh->v, &e);
-}
-
-
-static int cond (LexState *ls) {
- /* cond -> exp */
- expdesc v;
- expr(ls, &v); /* read condition */
- if (v.k == VNIL) v.k = VFALSE; /* `falses' are all equal here */
- luaK_goiftrue(ls->fs, &v);
- return v.f;
-}
-
-
-static void breakstat (LexState *ls) {
- FuncState *fs = ls->fs;
- BlockCnt *bl = fs->bl;
- int upval = 0;
- while (bl && !bl->isbreakable) {
- upval |= bl->upval;
- bl = bl->previous;
- }
- if (!bl)
- luaX_syntaxerror(ls, "no loop to break");
- if (upval)
- luaK_codeABC(fs, OP_CLOSE, bl->nactvar, 0, 0);
- luaK_concat(fs, &bl->breaklist, luaK_jump(fs));
-}
-
-
-static void whilestat (LexState *ls, int line) {
- /* whilestat -> WHILE cond DO block END */
- FuncState *fs = ls->fs;
- int whileinit;
- int condexit;
- BlockCnt bl;
- luaX_next(ls); /* skip WHILE */
- whileinit = luaK_getlabel(fs);
- condexit = cond(ls);
- enterblock(fs, &bl, 1);
- checknext(ls, TK_DO);
- block(ls);
- luaK_patchlist(fs, luaK_jump(fs), whileinit);
- check_match(ls, TK_END, TK_WHILE, line);
- leaveblock(fs);
- luaK_patchtohere(fs, condexit); /* false conditions finish the loop */
-}
-
-
-static void repeatstat (LexState *ls, int line) {
- /* repeatstat -> REPEAT block UNTIL cond */
- int condexit;
- FuncState *fs = ls->fs;
- int repeat_init = luaK_getlabel(fs);
- BlockCnt bl1, bl2;
- enterblock(fs, &bl1, 1); /* loop block */
- enterblock(fs, &bl2, 0); /* scope block */
- luaX_next(ls); /* skip REPEAT */
- chunk(ls);
- check_match(ls, TK_UNTIL, TK_REPEAT, line);
- condexit = cond(ls); /* read condition (inside scope block) */
- if (!bl2.upval) { /* no upvalues? */
- leaveblock(fs); /* finish scope */
- luaK_patchlist(ls->fs, condexit, repeat_init); /* close the loop */
- }
- else { /* complete semantics when there are upvalues */
- breakstat(ls); /* if condition then break */
- luaK_patchtohere(ls->fs, condexit); /* else... */
- leaveblock(fs); /* finish scope... */
- luaK_patchlist(ls->fs, luaK_jump(fs), repeat_init); /* and repeat */
- }
- leaveblock(fs); /* finish loop */
-}
-
-
-static int exp1 (LexState *ls) {
- expdesc e;
- int k;
- expr(ls, &e);
- k = e.k;
- luaK_exp2nextreg(ls->fs, &e);
- return k;
-}
-
-
-static void forbody (LexState *ls, int base, int line, int nvars, int isnum) {
- /* forbody -> DO block */
- BlockCnt bl;
- FuncState *fs = ls->fs;
- int prep, endfor;
- adjustlocalvars(ls, 3); /* control variables */
- checknext(ls, TK_DO);
- prep = isnum ? luaK_codeAsBx(fs, OP_FORPREP, base, NO_JUMP) : luaK_jump(fs);
- enterblock(fs, &bl, 0); /* scope for declared variables */
- adjustlocalvars(ls, nvars);
- luaK_reserveregs(fs, nvars);
- block(ls);
- leaveblock(fs); /* end of scope for declared variables */
- luaK_patchtohere(fs, prep);
- endfor = (isnum) ? luaK_codeAsBx(fs, OP_FORLOOP, base, NO_JUMP) :
- luaK_codeABC(fs, OP_TFORLOOP, base, 0, nvars);
- luaK_fixline(fs, line); /* pretend that `OP_FOR' starts the loop */
- luaK_patchlist(fs, (isnum ? endfor : luaK_jump(fs)), prep + 1);
-}
-
-
-static void fornum (LexState *ls, TString *varname, int line) {
- /* fornum -> NAME = exp1,exp1[,exp1] forbody */
- FuncState *fs = ls->fs;
- int base = fs->freereg;
- new_localvarliteral(ls, "(for index)", 0);
- new_localvarliteral(ls, "(for limit)", 1);
- new_localvarliteral(ls, "(for step)", 2);
- new_localvar(ls, varname, 3);
- checknext(ls, '=');
- exp1(ls); /* initial value */
- checknext(ls, ',');
- exp1(ls); /* limit */
- if (testnext(ls, ','))
- exp1(ls); /* optional step */
- else { /* default step = 1 */
- luaK_codeABx(fs, OP_LOADK, fs->freereg, luaK_numberK(fs, 1));
- luaK_reserveregs(fs, 1);
- }
- forbody(ls, base, line, 1, 1);
-}
-
-
-static void forlist (LexState *ls, TString *indexname) {
- /* forlist -> NAME {,NAME} IN explist1 forbody */
- FuncState *fs = ls->fs;
- expdesc e;
- int nvars = 0;
- int line;
- int base = fs->freereg;
- /* create control variables */
- new_localvarliteral(ls, "(for generator)", nvars++);
- new_localvarliteral(ls, "(for state)", nvars++);
- new_localvarliteral(ls, "(for control)", nvars++);
- /* create declared variables */
- new_localvar(ls, indexname, nvars++);
- while (testnext(ls, ','))
- new_localvar(ls, str_checkname(ls), nvars++);
- checknext(ls, TK_IN);
- line = ls->linenumber;
- adjust_assign(ls, 3, explist1(ls, &e), &e);
- luaK_checkstack(fs, 3); /* extra space to call generator */
- forbody(ls, base, line, nvars - 3, 0);
-}
-
-
-static void forstat (LexState *ls, int line) {
- /* forstat -> FOR (fornum | forlist) END */
- FuncState *fs = ls->fs;
- TString *varname;
- BlockCnt bl;
- enterblock(fs, &bl, 1); /* scope for loop and control variables */
- luaX_next(ls); /* skip `for' */
- varname = str_checkname(ls); /* first variable name */
- switch (ls->t.token) {
- case '=': fornum(ls, varname, line); break;
- case ',': case TK_IN: forlist(ls, varname); break;
- default: luaX_syntaxerror(ls, LUA_QL("=") " or " LUA_QL("in") " expected");
- }
- check_match(ls, TK_END, TK_FOR, line);
- leaveblock(fs); /* loop scope (`break' jumps to this point) */
-}
-
-
-static int test_then_block (LexState *ls) {
- /* test_then_block -> [IF | ELSEIF] cond THEN block */
- int condexit;
- luaX_next(ls); /* skip IF or ELSEIF */
- condexit = cond(ls);
- checknext(ls, TK_THEN);
- block(ls); /* `then' part */
- return condexit;
-}
-
-
-static void ifstat (LexState *ls, int line) {
- /* ifstat -> IF cond THEN block {ELSEIF cond THEN block} [ELSE block] END */
- FuncState *fs = ls->fs;
- int flist;
- int escapelist = NO_JUMP;
- flist = test_then_block(ls); /* IF cond THEN block */
- while (ls->t.token == TK_ELSEIF) {
- luaK_concat(fs, &escapelist, luaK_jump(fs));
- luaK_patchtohere(fs, flist);
- flist = test_then_block(ls); /* ELSEIF cond THEN block */
- }
- if (ls->t.token == TK_ELSE) {
- luaK_concat(fs, &escapelist, luaK_jump(fs));
- luaK_patchtohere(fs, flist);
- luaX_next(ls); /* skip ELSE (after patch, for correct line info) */
- block(ls); /* `else' part */
- }
- else
- luaK_concat(fs, &escapelist, flist);
- luaK_patchtohere(fs, escapelist);
- check_match(ls, TK_END, TK_IF, line);
-}
-
-
-static void localfunc (LexState *ls) {
- expdesc v, b;
- FuncState *fs = ls->fs;
- new_localvar(ls, str_checkname(ls), 0);
- init_exp(&v, VLOCAL, fs->freereg);
- luaK_reserveregs(fs, 1);
- adjustlocalvars(ls, 1);
- body(ls, &b, 0, ls->linenumber);
- luaK_storevar(fs, &v, &b);
- /* debug information will only see the variable after this point! */
- getlocvar(fs, fs->nactvar - 1).startpc = fs->pc;
-}
-
-
-static void localstat (LexState *ls) {
- /* stat -> LOCAL NAME {`,' NAME} [`=' explist1] */
- int nvars = 0;
- int nexps;
- expdesc e;
- do {
- new_localvar(ls, str_checkname(ls), nvars++);
- } while (testnext(ls, ','));
- if (testnext(ls, '='))
- nexps = explist1(ls, &e);
- else {
- e.k = VVOID;
- nexps = 0;
- }
- adjust_assign(ls, nvars, nexps, &e);
- adjustlocalvars(ls, nvars);
-}
-
-
-static int funcname (LexState *ls, expdesc *v) {
- /* funcname -> NAME {field} [`:' NAME] */
- int needself = 0;
- singlevar(ls, v);
- while (ls->t.token == '.')
- field(ls, v);
- if (ls->t.token == ':') {
- needself = 1;
- field(ls, v);
- }
- return needself;
-}
-
-
-static void funcstat (LexState *ls, int line) {
- /* funcstat -> FUNCTION funcname body */
- int needself;
- expdesc v, b;
- luaX_next(ls); /* skip FUNCTION */
- needself = funcname(ls, &v);
- body(ls, &b, needself, line);
- luaK_storevar(ls->fs, &v, &b);
- luaK_fixline(ls->fs, line); /* definition `happens' in the first line */
-}
-
-
-static void exprstat (LexState *ls) {
- /* stat -> func | assignment */
- FuncState *fs = ls->fs;
- struct LHS_assign v;
- primaryexp(ls, &v.v);
- if (v.v.k == VCALL) /* stat -> func */
- SETARG_C(getcode(fs, &v.v), 1); /* call statement uses no results */
- else { /* stat -> assignment */
- v.prev = NULL;
- assignment(ls, &v, 1);
- }
-}
-
-
-static void retstat (LexState *ls) {
- /* stat -> RETURN explist */
- FuncState *fs = ls->fs;
- expdesc e;
- int first, nret; /* registers with returned values */
- luaX_next(ls); /* skip RETURN */
- if (block_follow(ls->t.token) || ls->t.token == ';')
- first = nret = 0; /* return no values */
- else {
- nret = explist1(ls, &e); /* optional return values */
- if (hasmultret(e.k)) {
- luaK_setmultret(fs, &e);
- if (e.k == VCALL && nret == 1) { /* tail call? */
- SET_OPCODE(getcode(fs,&e), OP_TAILCALL);
- lua_assert(GETARG_A(getcode(fs,&e)) == fs->nactvar);
- }
- first = fs->nactvar;
- nret = LUA_MULTRET; /* return all values */
- }
- else {
- if (nret == 1) /* only one single value? */
- first = luaK_exp2anyreg(fs, &e);
- else {
- luaK_exp2nextreg(fs, &e); /* values must go to the `stack' */
- first = fs->nactvar; /* return all `active' values */
- lua_assert(nret == fs->freereg - first);
- }
- }
- }
- luaK_ret(fs, first, nret);
-}
-
-
-static int statement (LexState *ls) {
- int line = ls->linenumber; /* may be needed for error messages */
- switch (ls->t.token) {
- case TK_IF: { /* stat -> ifstat */
- ifstat(ls, line);
- return 0;
- }
- case TK_WHILE: { /* stat -> whilestat */
- whilestat(ls, line);
- return 0;
- }
- case TK_DO: { /* stat -> DO block END */
- luaX_next(ls); /* skip DO */
- block(ls);
- check_match(ls, TK_END, TK_DO, line);
- return 0;
- }
- case TK_FOR: { /* stat -> forstat */
- forstat(ls, line);
- return 0;
- }
- case TK_REPEAT: { /* stat -> repeatstat */
- repeatstat(ls, line);
- return 0;
- }
- case TK_FUNCTION: {
- funcstat(ls, line); /* stat -> funcstat */
- return 0;
- }
- case TK_LOCAL: { /* stat -> localstat */
- luaX_next(ls); /* skip LOCAL */
- if (testnext(ls, TK_FUNCTION)) /* local function? */
- localfunc(ls);
- else
- localstat(ls);
- return 0;
- }
- case TK_RETURN: { /* stat -> retstat */
- retstat(ls);
- return 1; /* must be last statement */
- }
- case TK_BREAK: { /* stat -> breakstat */
- luaX_next(ls); /* skip BREAK */
- breakstat(ls);
- return 1; /* must be last statement */
- }
- default: {
- exprstat(ls);
- return 0; /* to avoid warnings */
- }
- }
-}
-
-
-static void chunk (LexState *ls) {
- /* chunk -> { stat [`;'] } */
- int islast = 0;
- enterlevel(ls);
- while (!islast && !block_follow(ls->t.token)) {
- islast = statement(ls);
- testnext(ls, ';');
- lua_assert(ls->fs->f->maxstacksize >= ls->fs->freereg &&
- ls->fs->freereg >= ls->fs->nactvar);
- ls->fs->freereg = ls->fs->nactvar; /* free registers */
- }
- leavelevel(ls);
-}
-
-/* }====================================================================== */
+++ /dev/null
-/*
-** $Id: lparser.h,v 1.57.1.1 2007/12/27 13:02:25 roberto Exp $
-** Lua Parser
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lparser_h
-#define lparser_h
-
-#include "llimits.h"
-#include "lobject.h"
-#include "lzio.h"
-
-
-/*
-** Expression descriptor
-*/
-
-typedef enum {
- VVOID, /* no value */
- VNIL,
- VTRUE,
- VFALSE,
- VK, /* info = index of constant in `k' */
- VKNUM, /* nval = numerical value */
- VLOCAL, /* info = local register */
- VUPVAL, /* info = index of upvalue in `upvalues' */
- VGLOBAL, /* info = index of table; aux = index of global name in `k' */
- VINDEXED, /* info = table register; aux = index register (or `k') */
- VJMP, /* info = instruction pc */
- VRELOCABLE, /* info = instruction pc */
- VNONRELOC, /* info = result register */
- VCALL, /* info = instruction pc */
- VVARARG /* info = instruction pc */
-} expkind;
-
-typedef struct expdesc {
- expkind k;
- union {
- struct { int info, aux; } s;
- lua_Number nval;
- } u;
- int t; /* patch list of `exit when true' */
- int f; /* patch list of `exit when false' */
-} expdesc;
-
-
-typedef struct upvaldesc {
- lu_byte k;
- lu_byte info;
-} upvaldesc;
-
-
-struct BlockCnt; /* defined in lparser.c */
-
-
-/* state needed to generate code for a given function */
-typedef struct FuncState {
- Proto *f; /* current function header */
- Table *h; /* table to find (and reuse) elements in `k' */
- struct FuncState *prev; /* enclosing function */
- struct LexState *ls; /* lexical state */
- struct lua_State *L; /* copy of the Lua state */
- struct BlockCnt *bl; /* chain of current blocks */
- int pc; /* next position to code (equivalent to `ncode') */
- int lasttarget; /* `pc' of last `jump target' */
- int jpc; /* list of pending jumps to `pc' */
- int freereg; /* first free register */
- int nk; /* number of elements in `k' */
- int np; /* number of elements in `p' */
- short nlocvars; /* number of elements in `locvars' */
- lu_byte nactvar; /* number of active local variables */
- upvaldesc upvalues[LUAI_MAXUPVALUES]; /* upvalues */
- unsigned short actvar[LUAI_MAXVARS]; /* declared-variable stack */
-} FuncState;
-
-
-LUAI_FUNC Proto *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff,
- const char *name);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lstate.c,v 2.36.1.2 2008/01/03 15:20:39 roberto Exp $
-** Global State
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stddef.h>
-
-#define lstate_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "llex.h"
-#include "lmem.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-
-
-#define state_size(x) (sizeof(x) + LUAI_EXTRASPACE)
-#define fromstate(l) (cast(lu_byte *, (l)) - LUAI_EXTRASPACE)
-#define tostate(l) (cast(lua_State *, cast(lu_byte *, l) + LUAI_EXTRASPACE))
-
-
-/*
-** Main thread combines a thread state and the global state
-*/
-typedef struct LG {
- lua_State l;
- global_State g;
-} LG;
-
-
-
-static void stack_init (lua_State *L1, lua_State *L) {
- /* initialize CallInfo array */
- L1->base_ci = luaM_newvector(L, BASIC_CI_SIZE, CallInfo);
- L1->ci = L1->base_ci;
- L1->size_ci = BASIC_CI_SIZE;
- L1->end_ci = L1->base_ci + L1->size_ci - 1;
- /* initialize stack array */
- L1->stack = luaM_newvector(L, BASIC_STACK_SIZE + EXTRA_STACK, TValue);
- L1->stacksize = BASIC_STACK_SIZE + EXTRA_STACK;
- L1->top = L1->stack;
- L1->stack_last = L1->stack+(L1->stacksize - EXTRA_STACK)-1;
- /* initialize first ci */
- L1->ci->func = L1->top;
- setnilvalue(L1->top++); /* `function' entry for this `ci' */
- L1->base = L1->ci->base = L1->top;
- L1->ci->top = L1->top + LUA_MINSTACK;
-}
-
-
-static void freestack (lua_State *L, lua_State *L1) {
- luaM_freearray(L, L1->base_ci, L1->size_ci, CallInfo);
- luaM_freearray(L, L1->stack, L1->stacksize, TValue);
-}
-
-
-/*
-** open parts that may cause memory-allocation errors
-*/
-static void f_luaopen (lua_State *L, void *ud) {
- global_State *g = G(L);
- UNUSED(ud);
- stack_init(L, L); /* init stack */
- sethvalue(L, gt(L), luaH_new(L, 0, 2)); /* table of globals */
- sethvalue(L, registry(L), luaH_new(L, 0, 2)); /* registry */
- luaS_resize(L, MINSTRTABSIZE); /* initial size of string table */
- luaT_init(L);
- luaX_init(L);
- luaS_fix(luaS_newliteral(L, MEMERRMSG));
- g->GCthreshold = 4*g->totalbytes;
-}
-
-
-static void preinit_state (lua_State *L, global_State *g) {
- G(L) = g;
- L->stack = NULL;
- L->stacksize = 0;
- L->errorJmp = NULL;
- L->hook = NULL;
- L->hookmask = 0;
- L->basehookcount = 0;
- L->allowhook = 1;
- resethookcount(L);
- L->openupval = NULL;
- L->size_ci = 0;
- L->nCcalls = L->baseCcalls = 0;
- L->status = 0;
- L->base_ci = L->ci = NULL;
- L->savedpc = NULL;
- L->errfunc = 0;
- setnilvalue(gt(L));
-}
-
-
-static void close_state (lua_State *L) {
- global_State *g = G(L);
- luaF_close(L, L->stack); /* close all upvalues for this thread */
- luaC_freeall(L); /* collect all objects */
- lua_assert(g->rootgc == obj2gco(L));
- lua_assert(g->strt.nuse == 0);
- luaM_freearray(L, G(L)->strt.hash, G(L)->strt.size, TString *);
- luaZ_freebuffer(L, &g->buff);
- freestack(L, L);
- lua_assert(g->totalbytes == sizeof(LG));
- (*g->frealloc)(g->ud, fromstate(L), state_size(LG), 0);
-}
-
-
-lua_State *luaE_newthread (lua_State *L) {
- lua_State *L1 = tostate(luaM_malloc(L, state_size(lua_State)));
- luaC_link(L, obj2gco(L1), LUA_TTHREAD);
- preinit_state(L1, G(L));
- stack_init(L1, L); /* init stack */
- setobj2n(L, gt(L1), gt(L)); /* share table of globals */
- L1->hookmask = L->hookmask;
- L1->basehookcount = L->basehookcount;
- L1->hook = L->hook;
- resethookcount(L1);
- lua_assert(iswhite(obj2gco(L1)));
- return L1;
-}
-
-
-void luaE_freethread (lua_State *L, lua_State *L1) {
- luaF_close(L1, L1->stack); /* close all upvalues for this thread */
- lua_assert(L1->openupval == NULL);
- luai_userstatefree(L1);
- freestack(L, L1);
- luaM_freemem(L, fromstate(L1), state_size(lua_State));
-}
-
-
-LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud) {
- int i;
- lua_State *L;
- global_State *g;
- void *l = (*f)(ud, NULL, 0, state_size(LG));
- if (l == NULL) return NULL;
- L = tostate(l);
- g = &((LG *)L)->g;
- L->next = NULL;
- L->tt = LUA_TTHREAD;
- g->currentwhite = bit2mask(WHITE0BIT, FIXEDBIT);
- L->marked = luaC_white(g);
- set2bits(L->marked, FIXEDBIT, SFIXEDBIT);
- preinit_state(L, g);
- g->frealloc = f;
- g->ud = ud;
- g->mainthread = L;
- g->uvhead.u.l.prev = &g->uvhead;
- g->uvhead.u.l.next = &g->uvhead;
- g->GCthreshold = 0; /* mark it as unfinished state */
- g->strt.size = 0;
- g->strt.nuse = 0;
- g->strt.hash = NULL;
- setnilvalue(registry(L));
- luaZ_initbuffer(L, &g->buff);
- g->panic = NULL;
- g->gcstate = GCSpause;
- g->rootgc = obj2gco(L);
- g->sweepstrgc = 0;
- g->sweepgc = &g->rootgc;
- g->gray = NULL;
- g->grayagain = NULL;
- g->weak = NULL;
- g->tmudata = NULL;
- g->totalbytes = sizeof(LG);
- g->gcpause = LUAI_GCPAUSE;
- g->gcstepmul = LUAI_GCMUL;
- g->gcdept = 0;
- for (i=0; i<NUM_TAGS; i++) g->mt[i] = NULL;
- if (luaD_rawrunprotected(L, f_luaopen, NULL) != 0) {
- /* memory allocation error: free partial state */
- close_state(L);
- L = NULL;
- }
- else
- luai_userstateopen(L);
- return L;
-}
-
-
-static void callallgcTM (lua_State *L, void *ud) {
- UNUSED(ud);
- luaC_callGCTM(L); /* call GC metamethods for all udata */
-}
-
-
-LUA_API void lua_close (lua_State *L) {
- L = G(L)->mainthread; /* only the main thread can be closed */
- lua_lock(L);
- luaF_close(L, L->stack); /* close all upvalues for this thread */
- luaC_separateudata(L, 1); /* separate udata that have GC metamethods */
- L->errfunc = 0; /* no error function during GC metamethods */
- do { /* repeat until no more errors */
- L->ci = L->base_ci;
- L->base = L->top = L->ci->base;
- L->nCcalls = L->baseCcalls = 0;
- } while (luaD_rawrunprotected(L, callallgcTM, NULL) != 0);
- lua_assert(G(L)->tmudata == NULL);
- luai_userstateclose(L);
- close_state(L);
-}
+++ /dev/null
-/*
-** $Id: lstate.h,v 2.24.1.2 2008/01/03 15:20:39 roberto Exp $
-** Global State
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lstate_h
-#define lstate_h
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "ltm.h"
-#include "lzio.h"
-
-
-
-struct lua_longjmp; /* defined in ldo.c */
-
-
-/* table of globals */
-#define gt(L) (&L->l_gt)
-
-/* registry */
-#define registry(L) (&G(L)->l_registry)
-
-
-/* extra stack space to handle TM calls and some other extras */
-#define EXTRA_STACK 5
-
-
-#define BASIC_CI_SIZE 8
-
-#define BASIC_STACK_SIZE (2*LUA_MINSTACK)
-
-
-
-typedef struct stringtable {
- GCObject **hash;
- lu_int32 nuse; /* number of elements */
- int size;
-} stringtable;
-
-
-/*
-** informations about a call
-*/
-typedef struct CallInfo {
- StkId base; /* base for this function */
- StkId func; /* function index in the stack */
- StkId top; /* top for this function */
- const Instruction *savedpc;
- int nresults; /* expected number of results from this function */
- int tailcalls; /* number of tail calls lost under this entry */
-} CallInfo;
-
-
-
-#define curr_func(L) (clvalue(L->ci->func))
-#define ci_func(ci) (clvalue((ci)->func))
-#define f_isLua(ci) (!ci_func(ci)->c.isC)
-#define isLua(ci) (ttisfunction((ci)->func) && f_isLua(ci))
-
-
-/*
-** `global state', shared by all threads of this state
-*/
-typedef struct global_State {
- stringtable strt; /* hash table for strings */
- lua_Alloc frealloc; /* function to reallocate memory */
- void *ud; /* auxiliary data to `frealloc' */
- lu_byte currentwhite;
- lu_byte gcstate; /* state of garbage collector */
- int sweepstrgc; /* position of sweep in `strt' */
- GCObject *rootgc; /* list of all collectable objects */
- GCObject **sweepgc; /* position of sweep in `rootgc' */
- GCObject *gray; /* list of gray objects */
- GCObject *grayagain; /* list of objects to be traversed atomically */
- GCObject *weak; /* list of weak tables (to be cleared) */
- GCObject *tmudata; /* last element of list of userdata to be GC */
- Mbuffer buff; /* temporary buffer for string concatentation */
- lu_mem GCthreshold;
- lu_mem totalbytes; /* number of bytes currently allocated */
- lu_mem estimate; /* an estimate of number of bytes actually in use */
- lu_mem gcdept; /* how much GC is `behind schedule' */
- int gcpause; /* size of pause between successive GCs */
- int gcstepmul; /* GC `granularity' */
- lua_CFunction panic; /* to be called in unprotected errors */
- TValue l_registry;
- struct lua_State *mainthread;
- UpVal uvhead; /* head of double-linked list of all open upvalues */
- struct Table *mt[NUM_TAGS]; /* metatables for basic types */
- TString *tmname[TM_N]; /* array with tag-method names */
-} global_State;
-
-
-/*
-** `per thread' state
-*/
-struct lua_State {
- CommonHeader;
- lu_byte status;
- StkId top; /* first free slot in the stack */
- StkId base; /* base of current function */
- global_State *l_G;
- CallInfo *ci; /* call info for current function */
- const Instruction *savedpc; /* `savedpc' of current function */
- StkId stack_last; /* last free slot in the stack */
- StkId stack; /* stack base */
- CallInfo *end_ci; /* points after end of ci array*/
- CallInfo *base_ci; /* array of CallInfo's */
- int stacksize;
- int size_ci; /* size of array `base_ci' */
- unsigned short nCcalls; /* number of nested C calls */
- unsigned short baseCcalls; /* nested C calls when resuming coroutine */
- lu_byte hookmask;
- lu_byte allowhook;
- int basehookcount;
- int hookcount;
- lua_Hook hook;
- TValue l_gt; /* table of globals */
- TValue env; /* temporary place for environments */
- GCObject *openupval; /* list of open upvalues in this stack */
- GCObject *gclist;
- struct lua_longjmp *errorJmp; /* current error recover point */
- ptrdiff_t errfunc; /* current error handling function (stack index) */
-};
-
-
-#define G(L) (L->l_G)
-
-
-/*
-** Union of all collectable objects
-*/
-union GCObject {
- GCheader gch;
- union TString ts;
- union Udata u;
- union Closure cl;
- struct Table h;
- struct Proto p;
- struct UpVal uv;
- struct lua_State th; /* thread */
-};
-
-
-/* macros to convert a GCObject into a specific value */
-#define rawgco2ts(o) check_exp((o)->gch.tt == LUA_TSTRING, &((o)->ts))
-#define gco2ts(o) (&rawgco2ts(o)->tsv)
-#define rawgco2u(o) check_exp((o)->gch.tt == LUA_TUSERDATA, &((o)->u))
-#define gco2u(o) (&rawgco2u(o)->uv)
-#define gco2cl(o) check_exp((o)->gch.tt == LUA_TFUNCTION, &((o)->cl))
-#define gco2h(o) check_exp((o)->gch.tt == LUA_TTABLE, &((o)->h))
-#define gco2p(o) check_exp((o)->gch.tt == LUA_TPROTO, &((o)->p))
-#define gco2uv(o) check_exp((o)->gch.tt == LUA_TUPVAL, &((o)->uv))
-#define ngcotouv(o) \
- check_exp((o) == NULL || (o)->gch.tt == LUA_TUPVAL, &((o)->uv))
-#define gco2th(o) check_exp((o)->gch.tt == LUA_TTHREAD, &((o)->th))
-
-/* macro to convert any Lua object into a GCObject */
-#define obj2gco(v) (cast(GCObject *, (v)))
-
-
-LUAI_FUNC lua_State *luaE_newthread (lua_State *L);
-LUAI_FUNC void luaE_freethread (lua_State *L, lua_State *L1);
-
-#endif
+++ /dev/null
-/*
-** $Id: lstring.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
-** String table (keeps all strings handled by Lua)
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define lstring_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-
-
-
-void luaS_resize (lua_State *L, int newsize) {
- GCObject **newhash;
- stringtable *tb;
- int i;
- if (G(L)->gcstate == GCSsweepstring)
- return; /* cannot resize during GC traverse */
- newhash = luaM_newvector(L, newsize, GCObject *);
- tb = &G(L)->strt;
- for (i=0; i<newsize; i++) newhash[i] = NULL;
- /* rehash */
- for (i=0; i<tb->size; i++) {
- GCObject *p = tb->hash[i];
- while (p) { /* for each node in the list */
- GCObject *next = p->gch.next; /* save next */
- unsigned int h = gco2ts(p)->hash;
- int h1 = lmod(h, newsize); /* new position */
- lua_assert(cast_int(h%newsize) == lmod(h, newsize));
- p->gch.next = newhash[h1]; /* chain it */
- newhash[h1] = p;
- p = next;
- }
- }
- luaM_freearray(L, tb->hash, tb->size, TString *);
- tb->size = newsize;
- tb->hash = newhash;
-}
-
-
-static TString *newlstr (lua_State *L, const char *str, size_t l,
- unsigned int h) {
- TString *ts;
- stringtable *tb;
- if (l+1 > (MAX_SIZET - sizeof(TString))/sizeof(char))
- luaM_toobig(L);
- ts = cast(TString *, luaM_malloc(L, (l+1)*sizeof(char)+sizeof(TString)));
- ts->tsv.len = l;
- ts->tsv.hash = h;
- ts->tsv.marked = luaC_white(G(L));
- ts->tsv.tt = LUA_TSTRING;
- ts->tsv.reserved = 0;
- memcpy(ts+1, str, l*sizeof(char));
- ((char *)(ts+1))[l] = '\0'; /* ending 0 */
- tb = &G(L)->strt;
- h = lmod(h, tb->size);
- ts->tsv.next = tb->hash[h]; /* chain new entry */
- tb->hash[h] = obj2gco(ts);
- tb->nuse++;
- if (tb->nuse > cast(lu_int32, tb->size) && tb->size <= MAX_INT/2)
- luaS_resize(L, tb->size*2); /* too crowded */
- return ts;
-}
-
-
-TString *luaS_newlstr (lua_State *L, const char *str, size_t l) {
- GCObject *o;
- unsigned int h = cast(unsigned int, l); /* seed */
- size_t step = (l>>5)+1; /* if string is too long, don't hash all its chars */
- size_t l1;
- for (l1=l; l1>=step; l1-=step) /* compute hash */
- h = h ^ ((h<<5)+(h>>2)+cast(unsigned char, str[l1-1]));
- for (o = G(L)->strt.hash[lmod(h, G(L)->strt.size)];
- o != NULL;
- o = o->gch.next) {
- TString *ts = rawgco2ts(o);
- if (ts->tsv.len == l && (memcmp(str, getstr(ts), l) == 0)) {
- /* string may be dead */
- if (isdead(G(L), o)) changewhite(o);
- return ts;
- }
- }
- return newlstr(L, str, l, h); /* not found */
-}
-
-
-Udata *luaS_newudata (lua_State *L, size_t s, Table *e) {
- Udata *u;
- if (s > MAX_SIZET - sizeof(Udata))
- luaM_toobig(L);
- u = cast(Udata *, luaM_malloc(L, s + sizeof(Udata)));
- u->uv.marked = luaC_white(G(L)); /* is not finalized */
- u->uv.tt = LUA_TUSERDATA;
- u->uv.len = s;
- u->uv.metatable = NULL;
- u->uv.env = e;
- /* chain it on udata list (after main thread) */
- u->uv.next = G(L)->mainthread->next;
- G(L)->mainthread->next = obj2gco(u);
- return u;
-}
+++ /dev/null
-/*
-** $Id: lstring.h,v 1.43.1.1 2007/12/27 13:02:25 roberto Exp $
-** String table (keep all strings handled by Lua)
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lstring_h
-#define lstring_h
-
-
-#include "lgc.h"
-#include "lobject.h"
-#include "lstate.h"
-
-
-#define sizestring(s) (sizeof(union TString)+((s)->len+1)*sizeof(char))
-
-#define sizeudata(u) (sizeof(union Udata)+(u)->len)
-
-#define luaS_new(L, s) (luaS_newlstr(L, s, strlen(s)))
-#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \
- (sizeof(s)/sizeof(char))-1))
-
-#define luaS_fix(s) l_setbit((s)->tsv.marked, FIXEDBIT)
-
-LUAI_FUNC void luaS_resize (lua_State *L, int newsize);
-LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, Table *e);
-LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lstrlib.c,v 1.132.1.4 2008/07/11 17:27:21 roberto Exp $
-** Standard library for string operations and pattern-matching
-** See Copyright Notice in lua.h
-*/
-
-
-#include <ctype.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lstrlib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-/* macro to `unsign' a character */
-#define uchar(c) ((unsigned char)(c))
-
-
-
-static int str_len (lua_State *L) {
- size_t l;
- luaL_checklstring(L, 1, &l);
- lua_pushinteger(L, l);
- return 1;
-}
-
-
-static ptrdiff_t posrelat (ptrdiff_t pos, size_t len) {
- /* relative string position: negative means back from end */
- if (pos < 0) pos += (ptrdiff_t)len + 1;
- return (pos >= 0) ? pos : 0;
-}
-
-
-static int str_sub (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- ptrdiff_t start = posrelat(luaL_checkinteger(L, 2), l);
- ptrdiff_t end = posrelat(luaL_optinteger(L, 3, -1), l);
- if (start < 1) start = 1;
- if (end > (ptrdiff_t)l) end = (ptrdiff_t)l;
- if (start <= end)
- lua_pushlstring(L, s+start-1, end-start+1);
- else lua_pushliteral(L, "");
- return 1;
-}
-
-
-static int str_reverse (lua_State *L) {
- size_t l;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- luaL_buffinit(L, &b);
- while (l--) luaL_addchar(&b, s[l]);
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int str_lower (lua_State *L) {
- size_t l;
- size_t i;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- luaL_buffinit(L, &b);
- for (i=0; i<l; i++)
- luaL_addchar(&b, tolower(uchar(s[i])));
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int str_upper (lua_State *L) {
- size_t l;
- size_t i;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- luaL_buffinit(L, &b);
- for (i=0; i<l; i++)
- luaL_addchar(&b, toupper(uchar(s[i])));
- luaL_pushresult(&b);
- return 1;
-}
-
-static int str_rep (lua_State *L) {
- size_t l;
- luaL_Buffer b;
- const char *s = luaL_checklstring(L, 1, &l);
- int n = luaL_checkint(L, 2);
- luaL_buffinit(L, &b);
- while (n-- > 0)
- luaL_addlstring(&b, s, l);
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int str_byte (lua_State *L) {
- size_t l;
- const char *s = luaL_checklstring(L, 1, &l);
- ptrdiff_t posi = posrelat(luaL_optinteger(L, 2, 1), l);
- ptrdiff_t pose = posrelat(luaL_optinteger(L, 3, posi), l);
- int n, i;
- if (posi <= 0) posi = 1;
- if ((size_t)pose > l) pose = l;
- if (posi > pose) return 0; /* empty interval; return no values */
- n = (int)(pose - posi + 1);
- if (posi + n <= pose) /* overflow? */
- luaL_error(L, "string slice too long");
- luaL_checkstack(L, n, "string slice too long");
- for (i=0; i<n; i++)
- lua_pushinteger(L, uchar(s[posi+i-1]));
- return n;
-}
-
-
-static int str_char (lua_State *L) {
- int n = lua_gettop(L); /* number of arguments */
- int i;
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- for (i=1; i<=n; i++) {
- int c = luaL_checkint(L, i);
- luaL_argcheck(L, uchar(c) == c, i, "invalid value");
- luaL_addchar(&b, uchar(c));
- }
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static int writer (lua_State *L, const void* b, size_t size, void* B) {
- (void)L;
- luaL_addlstring((luaL_Buffer*) B, (const char *)b, size);
- return 0;
-}
-
-
-static int str_dump (lua_State *L) {
- luaL_Buffer b;
- luaL_checktype(L, 1, LUA_TFUNCTION);
- lua_settop(L, 1);
- luaL_buffinit(L,&b);
- if (lua_dump(L, writer, &b) != 0)
- luaL_error(L, "unable to dump given function");
- luaL_pushresult(&b);
- return 1;
-}
-
-
-
-/*
-** {======================================================
-** PATTERN MATCHING
-** =======================================================
-*/
-
-
-#define CAP_UNFINISHED (-1)
-#define CAP_POSITION (-2)
-
-typedef struct MatchState {
- const char *src_init; /* init of source string */
- const char *src_end; /* end (`\0') of source string */
- lua_State *L;
- int level; /* total number of captures (finished or unfinished) */
- struct {
- const char *init;
- ptrdiff_t len;
- } capture[LUA_MAXCAPTURES];
-} MatchState;
-
-
-#define L_ESC '%'
-#define SPECIALS "^$*+?.([%-"
-
-
-static int check_capture (MatchState *ms, int l) {
- l -= '1';
- if (l < 0 || l >= ms->level || ms->capture[l].len == CAP_UNFINISHED)
- return luaL_error(ms->L, "invalid capture index");
- return l;
-}
-
-
-static int capture_to_close (MatchState *ms) {
- int level = ms->level;
- for (level--; level>=0; level--)
- if (ms->capture[level].len == CAP_UNFINISHED) return level;
- return luaL_error(ms->L, "invalid pattern capture");
-}
-
-
-static const char *classend (MatchState *ms, const char *p) {
- switch (*p++) {
- case L_ESC: {
- if (*p == '\0')
- luaL_error(ms->L, "malformed pattern (ends with " LUA_QL("%%") ")");
- return p+1;
- }
- case '[': {
- if (*p == '^') p++;
- do { /* look for a `]' */
- if (*p == '\0')
- luaL_error(ms->L, "malformed pattern (missing " LUA_QL("]") ")");
- if (*(p++) == L_ESC && *p != '\0')
- p++; /* skip escapes (e.g. `%]') */
- } while (*p != ']');
- return p+1;
- }
- default: {
- return p;
- }
- }
-}
-
-
-static int match_class (int c, int cl) {
- int res;
- switch (tolower(cl)) {
- case 'a' : res = isalpha(c); break;
- case 'c' : res = iscntrl(c); break;
- case 'd' : res = isdigit(c); break;
- case 'l' : res = islower(c); break;
- case 'p' : res = ispunct(c); break;
- case 's' : res = isspace(c); break;
- case 'u' : res = isupper(c); break;
- case 'w' : res = isalnum(c); break;
- case 'x' : res = isxdigit(c); break;
- case 'z' : res = (c == 0); break;
- default: return (cl == c);
- }
- return (islower(cl) ? res : !res);
-}
-
-
-static int matchbracketclass (int c, const char *p, const char *ec) {
- int sig = 1;
- if (*(p+1) == '^') {
- sig = 0;
- p++; /* skip the `^' */
- }
- while (++p < ec) {
- if (*p == L_ESC) {
- p++;
- if (match_class(c, uchar(*p)))
- return sig;
- }
- else if ((*(p+1) == '-') && (p+2 < ec)) {
- p+=2;
- if (uchar(*(p-2)) <= c && c <= uchar(*p))
- return sig;
- }
- else if (uchar(*p) == c) return sig;
- }
- return !sig;
-}
-
-
-static int singlematch (int c, const char *p, const char *ep) {
- switch (*p) {
- case '.': return 1; /* matches any char */
- case L_ESC: return match_class(c, uchar(*(p+1)));
- case '[': return matchbracketclass(c, p, ep-1);
- default: return (uchar(*p) == c);
- }
-}
-
-
-static const char *match (MatchState *ms, const char *s, const char *p);
-
-
-static const char *matchbalance (MatchState *ms, const char *s,
- const char *p) {
- if (*p == 0 || *(p+1) == 0)
- luaL_error(ms->L, "unbalanced pattern");
- if (*s != *p) return NULL;
- else {
- int b = *p;
- int e = *(p+1);
- int cont = 1;
- while (++s < ms->src_end) {
- if (*s == e) {
- if (--cont == 0) return s+1;
- }
- else if (*s == b) cont++;
- }
- }
- return NULL; /* string ends out of balance */
-}
-
-
-static const char *max_expand (MatchState *ms, const char *s,
- const char *p, const char *ep) {
- ptrdiff_t i = 0; /* counts maximum expand for item */
- while ((s+i)<ms->src_end && singlematch(uchar(*(s+i)), p, ep))
- i++;
- /* keeps trying to match with the maximum repetitions */
- while (i>=0) {
- const char *res = match(ms, (s+i), ep+1);
- if (res) return res;
- i--; /* else didn't match; reduce 1 repetition to try again */
- }
- return NULL;
-}
-
-
-static const char *min_expand (MatchState *ms, const char *s,
- const char *p, const char *ep) {
- for (;;) {
- const char *res = match(ms, s, ep+1);
- if (res != NULL)
- return res;
- else if (s<ms->src_end && singlematch(uchar(*s), p, ep))
- s++; /* try with one more repetition */
- else return NULL;
- }
-}
-
-
-static const char *start_capture (MatchState *ms, const char *s,
- const char *p, int what) {
- const char *res;
- int level = ms->level;
- if (level >= LUA_MAXCAPTURES) luaL_error(ms->L, "too many captures");
- ms->capture[level].init = s;
- ms->capture[level].len = what;
- ms->level = level+1;
- if ((res=match(ms, s, p)) == NULL) /* match failed? */
- ms->level--; /* undo capture */
- return res;
-}
-
-
-static const char *end_capture (MatchState *ms, const char *s,
- const char *p) {
- int l = capture_to_close(ms);
- const char *res;
- ms->capture[l].len = s - ms->capture[l].init; /* close capture */
- if ((res = match(ms, s, p)) == NULL) /* match failed? */
- ms->capture[l].len = CAP_UNFINISHED; /* undo capture */
- return res;
-}
-
-
-static const char *match_capture (MatchState *ms, const char *s, int l) {
- size_t len;
- l = check_capture(ms, l);
- len = ms->capture[l].len;
- if ((size_t)(ms->src_end-s) >= len &&
- memcmp(ms->capture[l].init, s, len) == 0)
- return s+len;
- else return NULL;
-}
-
-
-static const char *match (MatchState *ms, const char *s, const char *p) {
- init: /* using goto's to optimize tail recursion */
- switch (*p) {
- case '(': { /* start capture */
- if (*(p+1) == ')') /* position capture? */
- return start_capture(ms, s, p+2, CAP_POSITION);
- else
- return start_capture(ms, s, p+1, CAP_UNFINISHED);
- }
- case ')': { /* end capture */
- return end_capture(ms, s, p+1);
- }
- case L_ESC: {
- switch (*(p+1)) {
- case 'b': { /* balanced string? */
- s = matchbalance(ms, s, p+2);
- if (s == NULL) return NULL;
- p+=4; goto init; /* else return match(ms, s, p+4); */
- }
- case 'f': { /* frontier? */
- const char *ep; char previous;
- p += 2;
- if (*p != '[')
- luaL_error(ms->L, "missing " LUA_QL("[") " after "
- LUA_QL("%%f") " in pattern");
- ep = classend(ms, p); /* points to what is next */
- previous = (s == ms->src_init) ? '\0' : *(s-1);
- if (matchbracketclass(uchar(previous), p, ep-1) ||
- !matchbracketclass(uchar(*s), p, ep-1)) return NULL;
- p=ep; goto init; /* else return match(ms, s, ep); */
- }
- default: {
- if (isdigit(uchar(*(p+1)))) { /* capture results (%0-%9)? */
- s = match_capture(ms, s, uchar(*(p+1)));
- if (s == NULL) return NULL;
- p+=2; goto init; /* else return match(ms, s, p+2) */
- }
- goto dflt; /* case default */
- }
- }
- }
- case '\0': { /* end of pattern */
- return s; /* match succeeded */
- }
- case '$': {
- if (*(p+1) == '\0') /* is the `$' the last char in pattern? */
- return (s == ms->src_end) ? s : NULL; /* check end of string */
- else goto dflt;
- }
- default: dflt: { /* it is a pattern item */
- const char *ep = classend(ms, p); /* points to what is next */
- int m = s<ms->src_end && singlematch(uchar(*s), p, ep);
- switch (*ep) {
- case '?': { /* optional */
- const char *res;
- if (m && ((res=match(ms, s+1, ep+1)) != NULL))
- return res;
- p=ep+1; goto init; /* else return match(ms, s, ep+1); */
- }
- case '*': { /* 0 or more repetitions */
- return max_expand(ms, s, p, ep);
- }
- case '+': { /* 1 or more repetitions */
- return (m ? max_expand(ms, s+1, p, ep) : NULL);
- }
- case '-': { /* 0 or more repetitions (minimum) */
- return min_expand(ms, s, p, ep);
- }
- default: {
- if (!m) return NULL;
- s++; p=ep; goto init; /* else return match(ms, s+1, ep); */
- }
- }
- }
- }
-}
-
-
-
-static const char *lmemfind (const char *s1, size_t l1,
- const char *s2, size_t l2) {
- if (l2 == 0) return s1; /* empty strings are everywhere */
- else if (l2 > l1) return NULL; /* avoids a negative `l1' */
- else {
- const char *init; /* to search for a `*s2' inside `s1' */
- l2--; /* 1st char will be checked by `memchr' */
- l1 = l1-l2; /* `s2' cannot be found after that */
- while (l1 > 0 && (init = (const char *)memchr(s1, *s2, l1)) != NULL) {
- init++; /* 1st char is already checked */
- if (memcmp(init, s2+1, l2) == 0)
- return init-1;
- else { /* correct `l1' and `s1' to try again */
- l1 -= init-s1;
- s1 = init;
- }
- }
- return NULL; /* not found */
- }
-}
-
-
-static void push_onecapture (MatchState *ms, int i, const char *s,
- const char *e) {
- if (i >= ms->level) {
- if (i == 0) /* ms->level == 0, too */
- lua_pushlstring(ms->L, s, e - s); /* add whole match */
- else
- luaL_error(ms->L, "invalid capture index");
- }
- else {
- ptrdiff_t l = ms->capture[i].len;
- if (l == CAP_UNFINISHED) luaL_error(ms->L, "unfinished capture");
- if (l == CAP_POSITION)
- lua_pushinteger(ms->L, ms->capture[i].init - ms->src_init + 1);
- else
- lua_pushlstring(ms->L, ms->capture[i].init, l);
- }
-}
-
-
-static int push_captures (MatchState *ms, const char *s, const char *e) {
- int i;
- int nlevels = (ms->level == 0 && s) ? 1 : ms->level;
- luaL_checkstack(ms->L, nlevels, "too many captures");
- for (i = 0; i < nlevels; i++)
- push_onecapture(ms, i, s, e);
- return nlevels; /* number of strings pushed */
-}
-
-
-static int str_find_aux (lua_State *L, int find) {
- size_t l1, l2;
- const char *s = luaL_checklstring(L, 1, &l1);
- const char *p = luaL_checklstring(L, 2, &l2);
- ptrdiff_t init = posrelat(luaL_optinteger(L, 3, 1), l1) - 1;
- if (init < 0) init = 0;
- else if ((size_t)(init) > l1) init = (ptrdiff_t)l1;
- if (find && (lua_toboolean(L, 4) || /* explicit request? */
- strpbrk(p, SPECIALS) == NULL)) { /* or no special characters? */
- /* do a plain search */
- const char *s2 = lmemfind(s+init, l1-init, p, l2);
- if (s2) {
- lua_pushinteger(L, s2-s+1);
- lua_pushinteger(L, s2-s+l2);
- return 2;
- }
- }
- else {
- MatchState ms;
- int anchor = (*p == '^') ? (p++, 1) : 0;
- const char *s1=s+init;
- ms.L = L;
- ms.src_init = s;
- ms.src_end = s+l1;
- do {
- const char *res;
- ms.level = 0;
- if ((res=match(&ms, s1, p)) != NULL) {
- if (find) {
- lua_pushinteger(L, s1-s+1); /* start */
- lua_pushinteger(L, res-s); /* end */
- return push_captures(&ms, NULL, 0) + 2;
- }
- else
- return push_captures(&ms, s1, res);
- }
- } while (s1++ < ms.src_end && !anchor);
- }
- lua_pushnil(L); /* not found */
- return 1;
-}
-
-
-static int str_find (lua_State *L) {
- return str_find_aux(L, 1);
-}
-
-
-static int str_match (lua_State *L) {
- return str_find_aux(L, 0);
-}
-
-
-static int gmatch_aux (lua_State *L) {
- MatchState ms;
- size_t ls;
- const char *s = lua_tolstring(L, lua_upvalueindex(1), &ls);
- const char *p = lua_tostring(L, lua_upvalueindex(2));
- const char *src;
- ms.L = L;
- ms.src_init = s;
- ms.src_end = s+ls;
- for (src = s + (size_t)lua_tointeger(L, lua_upvalueindex(3));
- src <= ms.src_end;
- src++) {
- const char *e;
- ms.level = 0;
- if ((e = match(&ms, src, p)) != NULL) {
- lua_Integer newstart = e-s;
- if (e == src) newstart++; /* empty match? go at least one position */
- lua_pushinteger(L, newstart);
- lua_replace(L, lua_upvalueindex(3));
- return push_captures(&ms, src, e);
- }
- }
- return 0; /* not found */
-}
-
-
-static int gmatch (lua_State *L) {
- luaL_checkstring(L, 1);
- luaL_checkstring(L, 2);
- lua_settop(L, 2);
- lua_pushinteger(L, 0);
- lua_pushcclosure(L, gmatch_aux, 3);
- return 1;
-}
-
-
-static int gfind_nodef (lua_State *L) {
- return luaL_error(L, LUA_QL("string.gfind") " was renamed to "
- LUA_QL("string.gmatch"));
-}
-
-
-static void add_s (MatchState *ms, luaL_Buffer *b, const char *s,
- const char *e) {
- size_t l, i;
- const char *news = lua_tolstring(ms->L, 3, &l);
- for (i = 0; i < l; i++) {
- if (news[i] != L_ESC)
- luaL_addchar(b, news[i]);
- else {
- i++; /* skip ESC */
- if (!isdigit(uchar(news[i])))
- luaL_addchar(b, news[i]);
- else if (news[i] == '0')
- luaL_addlstring(b, s, e - s);
- else {
- push_onecapture(ms, news[i] - '1', s, e);
- luaL_addvalue(b); /* add capture to accumulated result */
- }
- }
- }
-}
-
-
-static void add_value (MatchState *ms, luaL_Buffer *b, const char *s,
- const char *e) {
- lua_State *L = ms->L;
- switch (lua_type(L, 3)) {
- case LUA_TNUMBER:
- case LUA_TSTRING: {
- add_s(ms, b, s, e);
- return;
- }
- case LUA_TFUNCTION: {
- int n;
- lua_pushvalue(L, 3);
- n = push_captures(ms, s, e);
- lua_call(L, n, 1);
- break;
- }
- case LUA_TTABLE: {
- push_onecapture(ms, 0, s, e);
- lua_gettable(L, 3);
- break;
- }
- }
- if (!lua_toboolean(L, -1)) { /* nil or false? */
- lua_pop(L, 1);
- lua_pushlstring(L, s, e - s); /* keep original text */
- }
- else if (!lua_isstring(L, -1))
- luaL_error(L, "invalid replacement value (a %s)", luaL_typename(L, -1));
- luaL_addvalue(b); /* add result to accumulator */
-}
-
-
-static int str_gsub (lua_State *L) {
- size_t srcl;
- const char *src = luaL_checklstring(L, 1, &srcl);
- const char *p = luaL_checkstring(L, 2);
- int tr = lua_type(L, 3);
- int max_s = luaL_optint(L, 4, srcl+1);
- int anchor = (*p == '^') ? (p++, 1) : 0;
- int n = 0;
- MatchState ms;
- luaL_Buffer b;
- luaL_argcheck(L, tr == LUA_TNUMBER || tr == LUA_TSTRING ||
- tr == LUA_TFUNCTION || tr == LUA_TTABLE, 3,
- "string/function/table expected");
- luaL_buffinit(L, &b);
- ms.L = L;
- ms.src_init = src;
- ms.src_end = src+srcl;
- while (n < max_s) {
- const char *e;
- ms.level = 0;
- e = match(&ms, src, p);
- if (e) {
- n++;
- add_value(&ms, &b, src, e);
- }
- if (e && e>src) /* non empty match? */
- src = e; /* skip it */
- else if (src < ms.src_end)
- luaL_addchar(&b, *src++);
- else break;
- if (anchor) break;
- }
- luaL_addlstring(&b, src, ms.src_end-src);
- luaL_pushresult(&b);
- lua_pushinteger(L, n); /* number of substitutions */
- return 2;
-}
-
-/* }====================================================== */
-
-
-/* maximum size of each formatted item (> len(format('%99.99f', -1e308))) */
-#define MAX_ITEM 512
-/* valid flags in a format specification */
-#define FLAGS "-+ #0"
-/*
-** maximum size of each format specification (such as '%-099.99d')
-** (+10 accounts for %99.99x plus margin of error)
-*/
-#define MAX_FORMAT (sizeof(FLAGS) + sizeof(LUA_INTFRMLEN) + 10)
-
-
-static void addquoted (lua_State *L, luaL_Buffer *b, int arg) {
- size_t l;
- const char *s = luaL_checklstring(L, arg, &l);
- luaL_addchar(b, '"');
- while (l--) {
- switch (*s) {
- case '"': case '\\': case '\n': {
- luaL_addchar(b, '\\');
- luaL_addchar(b, *s);
- break;
- }
- case '\r': {
- luaL_addlstring(b, "\\r", 2);
- break;
- }
- case '\0': {
- luaL_addlstring(b, "\\000", 4);
- break;
- }
- default: {
- luaL_addchar(b, *s);
- break;
- }
- }
- s++;
- }
- luaL_addchar(b, '"');
-}
-
-static const char *scanformat (lua_State *L, const char *strfrmt, char *form) {
- const char *p = strfrmt;
- while (*p != '\0' && strchr(FLAGS, *p) != NULL) p++; /* skip flags */
- if ((size_t)(p - strfrmt) >= sizeof(FLAGS))
- luaL_error(L, "invalid format (repeated flags)");
- if (isdigit(uchar(*p))) p++; /* skip width */
- if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
- if (*p == '.') {
- p++;
- if (isdigit(uchar(*p))) p++; /* skip precision */
- if (isdigit(uchar(*p))) p++; /* (2 digits at most) */
- }
- if (isdigit(uchar(*p)))
- luaL_error(L, "invalid format (width or precision too long)");
- *(form++) = '%';
- strncpy(form, strfrmt, p - strfrmt + 1);
- form += p - strfrmt + 1;
- *form = '\0';
- return p;
-}
-
-
-static void addintlen (char *form) {
- size_t l = strlen(form);
- char spec = form[l - 1];
- strcpy(form + l - 1, LUA_INTFRMLEN);
- form[l + sizeof(LUA_INTFRMLEN) - 2] = spec;
- form[l + sizeof(LUA_INTFRMLEN) - 1] = '\0';
-}
-
-
-static int str_format (lua_State *L) {
- int arg = 1;
- size_t sfl;
- const char *strfrmt = luaL_checklstring(L, arg, &sfl);
- const char *strfrmt_end = strfrmt+sfl;
- luaL_Buffer b;
- luaL_buffinit(L, &b);
- while (strfrmt < strfrmt_end) {
- if (*strfrmt != L_ESC)
- luaL_addchar(&b, *strfrmt++);
- else if (*++strfrmt == L_ESC)
- luaL_addchar(&b, *strfrmt++); /* %% */
- else { /* format item */
- char form[MAX_FORMAT]; /* to store the format (`%...') */
- char buff[MAX_ITEM]; /* to store the formatted item */
- arg++;
- strfrmt = scanformat(L, strfrmt, form);
- switch (*strfrmt++) {
- case 'c': {
- sprintf(buff, form, (int)luaL_checknumber(L, arg));
- break;
- }
- case 'd': case 'i': {
- addintlen(form);
- sprintf(buff, form, (LUA_INTFRM_T)luaL_checknumber(L, arg));
- break;
- }
- case 'o': case 'u': case 'x': case 'X': {
- addintlen(form);
- sprintf(buff, form, (unsigned LUA_INTFRM_T)luaL_checknumber(L, arg));
- break;
- }
- case 'e': case 'E': case 'f':
- case 'g': case 'G': {
- sprintf(buff, form, (double)luaL_checknumber(L, arg));
- break;
- }
- case 'q': {
- addquoted(L, &b, arg);
- continue; /* skip the 'addsize' at the end */
- }
- case 's': {
- size_t l;
- const char *s = luaL_checklstring(L, arg, &l);
- if (!strchr(form, '.') && l >= 100) {
- /* no precision and string is too long to be formatted;
- keep original string */
- lua_pushvalue(L, arg);
- luaL_addvalue(&b);
- continue; /* skip the `addsize' at the end */
- }
- else {
- sprintf(buff, form, s);
- break;
- }
- }
- default: { /* also treat cases `pnLlh' */
- return luaL_error(L, "invalid option " LUA_QL("%%%c") " to "
- LUA_QL("format"), *(strfrmt - 1));
- }
- }
- luaL_addlstring(&b, buff, strlen(buff));
- }
- }
- luaL_pushresult(&b);
- return 1;
-}
-
-
-static const luaL_Reg strlib[] = {
- {"byte", str_byte},
- {"char", str_char},
- {"dump", str_dump},
- {"find", str_find},
- {"format", str_format},
- {"gfind", gfind_nodef},
- {"gmatch", gmatch},
- {"gsub", str_gsub},
- {"len", str_len},
- {"lower", str_lower},
- {"match", str_match},
- {"rep", str_rep},
- {"reverse", str_reverse},
- {"sub", str_sub},
- {"upper", str_upper},
- {NULL, NULL}
-};
-
-
-static void createmetatable (lua_State *L) {
- lua_createtable(L, 0, 1); /* create metatable for strings */
- lua_pushliteral(L, ""); /* dummy string */
- lua_pushvalue(L, -2);
- lua_setmetatable(L, -2); /* set string metatable */
- lua_pop(L, 1); /* pop dummy string */
- lua_pushvalue(L, -2); /* string library... */
- lua_setfield(L, -2, "__index"); /* ...is the __index metamethod */
- lua_pop(L, 1); /* pop metatable */
-}
-
-
-/*
-** Open string library
-*/
-LUALIB_API int luaopen_string (lua_State *L) {
- luaL_register(L, LUA_STRLIBNAME, strlib);
-#if defined(LUA_COMPAT_GFIND)
- lua_getfield(L, -1, "gmatch");
- lua_setfield(L, -2, "gfind");
-#endif
- createmetatable(L);
- return 1;
-}
+++ /dev/null
-/*
-** $Id: ltable.c,v 2.32.1.2 2007/12/28 15:32:23 roberto Exp $
-** Lua tables (hash)
-** See Copyright Notice in lua.h
-*/
-
-
-/*
-** Implementation of tables (aka arrays, objects, or hash tables).
-** Tables keep its elements in two parts: an array part and a hash part.
-** Non-negative integer keys are all candidates to be kept in the array
-** part. The actual size of the array is the largest `n' such that at
-** least half the slots between 0 and n are in use.
-** Hash uses a mix of chained scatter table with Brent's variation.
-** A main invariant of these tables is that, if an element is not
-** in its main position (i.e. the `original' position that its hash gives
-** to it), then the colliding element is in its own main position.
-** Hence even when the load factor reaches 100%, performance remains good.
-*/
-
-#include <math.h>
-#include <string.h>
-
-#define ltable_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lgc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstate.h"
-#include "ltable.h"
-
-
-/*
-** max size of array part is 2^MAXBITS
-*/
-#if LUAI_BITSINT > 26
-#define MAXBITS 26
-#else
-#define MAXBITS (LUAI_BITSINT-2)
-#endif
-
-#define MAXASIZE (1 << MAXBITS)
-
-
-#define hashpow2(t,n) (gnode(t, lmod((n), sizenode(t))))
-
-#define hashstr(t,str) hashpow2(t, (str)->tsv.hash)
-#define hashboolean(t,p) hashpow2(t, p)
-
-
-/*
-** for some types, it is better to avoid modulus by power of 2, as
-** they tend to have many 2 factors.
-*/
-#define hashmod(t,n) (gnode(t, ((n) % ((sizenode(t)-1)|1))))
-
-
-#define hashpointer(t,p) hashmod(t, IntPoint(p))
-
-
-/*
-** number of ints inside a lua_Number
-*/
-#define numints cast_int(sizeof(lua_Number)/sizeof(int))
-
-
-
-#define dummynode (&dummynode_)
-
-static const Node dummynode_ = {
- {{NULL}, LUA_TNIL}, /* value */
- {{{NULL}, LUA_TNIL, NULL}} /* key */
-};
-
-
-/*
-** hash for lua_Numbers
-*/
-static Node *hashnum (const Table *t, lua_Number n) {
- unsigned int a[numints];
- int i;
- if (luai_numeq(n, 0)) /* avoid problems with -0 */
- return gnode(t, 0);
- memcpy(a, &n, sizeof(a));
- for (i = 1; i < numints; i++) a[0] += a[i];
- return hashmod(t, a[0]);
-}
-
-
-
-/*
-** returns the `main' position of an element in a table (that is, the index
-** of its hash value)
-*/
-static Node *mainposition (const Table *t, const TValue *key) {
- switch (ttype(key)) {
- case LUA_TNUMBER:
- return hashnum(t, nvalue(key));
- case LUA_TSTRING:
- return hashstr(t, rawtsvalue(key));
- case LUA_TBOOLEAN:
- return hashboolean(t, bvalue(key));
- case LUA_TLIGHTUSERDATA:
- return hashpointer(t, pvalue(key));
- default:
- return hashpointer(t, gcvalue(key));
- }
-}
-
-
-/*
-** returns the index for `key' if `key' is an appropriate key to live in
-** the array part of the table, -1 otherwise.
-*/
-static int arrayindex (const TValue *key) {
- if (ttisnumber(key)) {
- lua_Number n = nvalue(key);
- int k;
- lua_number2int(k, n);
- if (luai_numeq(cast_num(k), n))
- return k;
- }
- return -1; /* `key' did not match some condition */
-}
-
-
-/*
-** returns the index of a `key' for table traversals. First goes all
-** elements in the array part, then elements in the hash part. The
-** beginning of a traversal is signalled by -1.
-*/
-static int findindex (lua_State *L, Table *t, StkId key) {
- int i;
- if (ttisnil(key)) return -1; /* first iteration */
- i = arrayindex(key);
- if (0 < i && i <= t->sizearray) /* is `key' inside array part? */
- return i-1; /* yes; that's the index (corrected to C) */
- else {
- Node *n = mainposition(t, key);
- do { /* check whether `key' is somewhere in the chain */
- /* key may be dead already, but it is ok to use it in `next' */
- if (luaO_rawequalObj(key2tval(n), key) ||
- (ttype(gkey(n)) == LUA_TDEADKEY && iscollectable(key) &&
- gcvalue(gkey(n)) == gcvalue(key))) {
- i = cast_int(n - gnode(t, 0)); /* key index in hash table */
- /* hash elements are numbered after array ones */
- return i + t->sizearray;
- }
- else n = gnext(n);
- } while (n);
- luaG_runerror(L, "invalid key to " LUA_QL("next")); /* key not found */
- return 0; /* to avoid warnings */
- }
-}
-
-
-int luaH_next (lua_State *L, Table *t, StkId key) {
- int i = findindex(L, t, key); /* find original element */
- for (i++; i < t->sizearray; i++) { /* try first array part */
- if (!ttisnil(&t->array[i])) { /* a non-nil value? */
- setnvalue(key, cast_num(i+1));
- setobj2s(L, key+1, &t->array[i]);
- return 1;
- }
- }
- for (i -= t->sizearray; i < sizenode(t); i++) { /* then hash part */
- if (!ttisnil(gval(gnode(t, i)))) { /* a non-nil value? */
- setobj2s(L, key, key2tval(gnode(t, i)));
- setobj2s(L, key+1, gval(gnode(t, i)));
- return 1;
- }
- }
- return 0; /* no more elements */
-}
-
-
-/*
-** {=============================================================
-** Rehash
-** ==============================================================
-*/
-
-
-static int computesizes (int nums[], int *narray) {
- int i;
- int twotoi; /* 2^i */
- int a = 0; /* number of elements smaller than 2^i */
- int na = 0; /* number of elements to go to array part */
- int n = 0; /* optimal size for array part */
- for (i = 0, twotoi = 1; twotoi/2 < *narray; i++, twotoi *= 2) {
- if (nums[i] > 0) {
- a += nums[i];
- if (a > twotoi/2) { /* more than half elements present? */
- n = twotoi; /* optimal size (till now) */
- na = a; /* all elements smaller than n will go to array part */
- }
- }
- if (a == *narray) break; /* all elements already counted */
- }
- *narray = n;
- lua_assert(*narray/2 <= na && na <= *narray);
- return na;
-}
-
-
-static int countint (const TValue *key, int *nums) {
- int k = arrayindex(key);
- if (0 < k && k <= MAXASIZE) { /* is `key' an appropriate array index? */
- nums[ceillog2(k)]++; /* count as such */
- return 1;
- }
- else
- return 0;
-}
-
-
-static int numusearray (const Table *t, int *nums) {
- int lg;
- int ttlg; /* 2^lg */
- int ause = 0; /* summation of `nums' */
- int i = 1; /* count to traverse all array keys */
- for (lg=0, ttlg=1; lg<=MAXBITS; lg++, ttlg*=2) { /* for each slice */
- int lc = 0; /* counter */
- int lim = ttlg;
- if (lim > t->sizearray) {
- lim = t->sizearray; /* adjust upper limit */
- if (i > lim)
- break; /* no more elements to count */
- }
- /* count elements in range (2^(lg-1), 2^lg] */
- for (; i <= lim; i++) {
- if (!ttisnil(&t->array[i-1]))
- lc++;
- }
- nums[lg] += lc;
- ause += lc;
- }
- return ause;
-}
-
-
-static int numusehash (const Table *t, int *nums, int *pnasize) {
- int totaluse = 0; /* total number of elements */
- int ause = 0; /* summation of `nums' */
- int i = sizenode(t);
- while (i--) {
- Node *n = &t->node[i];
- if (!ttisnil(gval(n))) {
- ause += countint(key2tval(n), nums);
- totaluse++;
- }
- }
- *pnasize += ause;
- return totaluse;
-}
-
-
-static void setarrayvector (lua_State *L, Table *t, int size) {
- int i;
- luaM_reallocvector(L, t->array, t->sizearray, size, TValue);
- for (i=t->sizearray; i<size; i++)
- setnilvalue(&t->array[i]);
- t->sizearray = size;
-}
-
-
-static void setnodevector (lua_State *L, Table *t, int size) {
- int lsize;
- if (size == 0) { /* no elements to hash part? */
- t->node = cast(Node *, dummynode); /* use common `dummynode' */
- lsize = 0;
- }
- else {
- int i;
- lsize = ceillog2(size);
- if (lsize > MAXBITS)
- luaG_runerror(L, "table overflow");
- size = twoto(lsize);
- t->node = luaM_newvector(L, size, Node);
- for (i=0; i<size; i++) {
- Node *n = gnode(t, i);
- gnext(n) = NULL;
- setnilvalue(gkey(n));
- setnilvalue(gval(n));
- }
- }
- t->lsizenode = cast_byte(lsize);
- t->lastfree = gnode(t, size); /* all positions are free */
-}
-
-
-static void resize (lua_State *L, Table *t, int nasize, int nhsize) {
- int i;
- int oldasize = t->sizearray;
- int oldhsize = t->lsizenode;
- Node *nold = t->node; /* save old hash ... */
- if (nasize > oldasize) /* array part must grow? */
- setarrayvector(L, t, nasize);
- /* create new hash part with appropriate size */
- setnodevector(L, t, nhsize);
- if (nasize < oldasize) { /* array part must shrink? */
- t->sizearray = nasize;
- /* re-insert elements from vanishing slice */
- for (i=nasize; i<oldasize; i++) {
- if (!ttisnil(&t->array[i]))
- setobjt2t(L, luaH_setnum(L, t, i+1), &t->array[i]);
- }
- /* shrink array */
- luaM_reallocvector(L, t->array, oldasize, nasize, TValue);
- }
- /* re-insert elements from hash part */
- for (i = twoto(oldhsize) - 1; i >= 0; i--) {
- Node *old = nold+i;
- if (!ttisnil(gval(old)))
- setobjt2t(L, luaH_set(L, t, key2tval(old)), gval(old));
- }
- if (nold != dummynode)
- luaM_freearray(L, nold, twoto(oldhsize), Node); /* free old array */
-}
-
-
-void luaH_resizearray (lua_State *L, Table *t, int nasize) {
- int nsize = (t->node == dummynode) ? 0 : sizenode(t);
- resize(L, t, nasize, nsize);
-}
-
-
-static void rehash (lua_State *L, Table *t, const TValue *ek) {
- int nasize, na;
- int nums[MAXBITS+1]; /* nums[i] = number of keys between 2^(i-1) and 2^i */
- int i;
- int totaluse;
- for (i=0; i<=MAXBITS; i++) nums[i] = 0; /* reset counts */
- nasize = numusearray(t, nums); /* count keys in array part */
- totaluse = nasize; /* all those keys are integer keys */
- totaluse += numusehash(t, nums, &nasize); /* count keys in hash part */
- /* count extra key */
- nasize += countint(ek, nums);
- totaluse++;
- /* compute new size for array part */
- na = computesizes(nums, &nasize);
- /* resize the table to new computed sizes */
- resize(L, t, nasize, totaluse - na);
-}
-
-
-
-/*
-** }=============================================================
-*/
-
-
-Table *luaH_new (lua_State *L, int narray, int nhash) {
- Table *t = luaM_new(L, Table);
- luaC_link(L, obj2gco(t), LUA_TTABLE);
- t->metatable = NULL;
- t->flags = cast_byte(~0);
- /* temporary values (kept only if some malloc fails) */
- t->array = NULL;
- t->sizearray = 0;
- t->lsizenode = 0;
- t->node = cast(Node *, dummynode);
- setarrayvector(L, t, narray);
- setnodevector(L, t, nhash);
- return t;
-}
-
-
-void luaH_free (lua_State *L, Table *t) {
- if (t->node != dummynode)
- luaM_freearray(L, t->node, sizenode(t), Node);
- luaM_freearray(L, t->array, t->sizearray, TValue);
- luaM_free(L, t);
-}
-
-
-static Node *getfreepos (Table *t) {
- while (t->lastfree-- > t->node) {
- if (ttisnil(gkey(t->lastfree)))
- return t->lastfree;
- }
- return NULL; /* could not find a free place */
-}
-
-
-
-/*
-** inserts a new key into a hash table; first, check whether key's main
-** position is free. If not, check whether colliding node is in its main
-** position or not: if it is not, move colliding node to an empty place and
-** put new key in its main position; otherwise (colliding node is in its main
-** position), new key goes to an empty position.
-*/
-static TValue *newkey (lua_State *L, Table *t, const TValue *key) {
- Node *mp = mainposition(t, key);
- if (!ttisnil(gval(mp)) || mp == dummynode) {
- Node *othern;
- Node *n = getfreepos(t); /* get a free place */
- if (n == NULL) { /* cannot find a free place? */
- rehash(L, t, key); /* grow table */
- return luaH_set(L, t, key); /* re-insert key into grown table */
- }
- lua_assert(n != dummynode);
- othern = mainposition(t, key2tval(mp));
- if (othern != mp) { /* is colliding node out of its main position? */
- /* yes; move colliding node into free position */
- while (gnext(othern) != mp) othern = gnext(othern); /* find previous */
- gnext(othern) = n; /* redo the chain with `n' in place of `mp' */
- *n = *mp; /* copy colliding node into free pos. (mp->next also goes) */
- gnext(mp) = NULL; /* now `mp' is free */
- setnilvalue(gval(mp));
- }
- else { /* colliding node is in its own main position */
- /* new node will go into free position */
- gnext(n) = gnext(mp); /* chain new position */
- gnext(mp) = n;
- mp = n;
- }
- }
- gkey(mp)->value = key->value; gkey(mp)->tt = key->tt;
- luaC_barriert(L, t, key);
- lua_assert(ttisnil(gval(mp)));
- return gval(mp);
-}
-
-
-/*
-** search function for integers
-*/
-const TValue *luaH_getnum (Table *t, int key) {
- /* (1 <= key && key <= t->sizearray) */
- if (cast(unsigned int, key-1) < cast(unsigned int, t->sizearray))
- return &t->array[key-1];
- else {
- lua_Number nk = cast_num(key);
- Node *n = hashnum(t, nk);
- do { /* check whether `key' is somewhere in the chain */
- if (ttisnumber(gkey(n)) && luai_numeq(nvalue(gkey(n)), nk))
- return gval(n); /* that's it */
- else n = gnext(n);
- } while (n);
- return luaO_nilobject;
- }
-}
-
-
-/*
-** search function for strings
-*/
-const TValue *luaH_getstr (Table *t, TString *key) {
- Node *n = hashstr(t, key);
- do { /* check whether `key' is somewhere in the chain */
- if (ttisstring(gkey(n)) && rawtsvalue(gkey(n)) == key)
- return gval(n); /* that's it */
- else n = gnext(n);
- } while (n);
- return luaO_nilobject;
-}
-
-
-/*
-** main search function
-*/
-const TValue *luaH_get (Table *t, const TValue *key) {
- switch (ttype(key)) {
- case LUA_TNIL: return luaO_nilobject;
- case LUA_TSTRING: return luaH_getstr(t, rawtsvalue(key));
- case LUA_TNUMBER: {
- int k;
- lua_Number n = nvalue(key);
- lua_number2int(k, n);
- if (luai_numeq(cast_num(k), nvalue(key))) /* index is int? */
- return luaH_getnum(t, k); /* use specialized version */
- /* else go through */
- }
- default: {
- Node *n = mainposition(t, key);
- do { /* check whether `key' is somewhere in the chain */
- if (luaO_rawequalObj(key2tval(n), key))
- return gval(n); /* that's it */
- else n = gnext(n);
- } while (n);
- return luaO_nilobject;
- }
- }
-}
-
-
-TValue *luaH_set (lua_State *L, Table *t, const TValue *key) {
- const TValue *p = luaH_get(t, key);
- t->flags = 0;
- if (p != luaO_nilobject)
- return cast(TValue *, p);
- else {
- if (ttisnil(key)) luaG_runerror(L, "table index is nil");
- else if (ttisnumber(key) && luai_numisnan(nvalue(key)))
- luaG_runerror(L, "table index is NaN");
- return newkey(L, t, key);
- }
-}
-
-
-TValue *luaH_setnum (lua_State *L, Table *t, int key) {
- const TValue *p = luaH_getnum(t, key);
- if (p != luaO_nilobject)
- return cast(TValue *, p);
- else {
- TValue k;
- setnvalue(&k, cast_num(key));
- return newkey(L, t, &k);
- }
-}
-
-
-TValue *luaH_setstr (lua_State *L, Table *t, TString *key) {
- const TValue *p = luaH_getstr(t, key);
- if (p != luaO_nilobject)
- return cast(TValue *, p);
- else {
- TValue k;
- setsvalue(L, &k, key);
- return newkey(L, t, &k);
- }
-}
-
-
-static int unbound_search (Table *t, unsigned int j) {
- unsigned int i = j; /* i is zero or a present index */
- j++;
- /* find `i' and `j' such that i is present and j is not */
- while (!ttisnil(luaH_getnum(t, j))) {
- i = j;
- j *= 2;
- if (j > cast(unsigned int, MAX_INT)) { /* overflow? */
- /* table was built with bad purposes: resort to linear search */
- i = 1;
- while (!ttisnil(luaH_getnum(t, i))) i++;
- return i - 1;
- }
- }
- /* now do a binary search between them */
- while (j - i > 1) {
- unsigned int m = (i+j)/2;
- if (ttisnil(luaH_getnum(t, m))) j = m;
- else i = m;
- }
- return i;
-}
-
-
-/*
-** Try to find a boundary in table `t'. A `boundary' is an integer index
-** such that t[i] is non-nil and t[i+1] is nil (and 0 if t[1] is nil).
-*/
-int luaH_getn (Table *t) {
- unsigned int j = t->sizearray;
- if (j > 0 && ttisnil(&t->array[j - 1])) {
- /* there is a boundary in the array part: (binary) search for it */
- unsigned int i = 0;
- while (j - i > 1) {
- unsigned int m = (i+j)/2;
- if (ttisnil(&t->array[m - 1])) j = m;
- else i = m;
- }
- return i;
- }
- /* else must find a boundary in hash part */
- else if (t->node == dummynode) /* hash part is empty? */
- return j; /* that is easy... */
- else return unbound_search(t, j);
-}
-
-
-
-#if defined(LUA_DEBUG)
-
-Node *luaH_mainposition (const Table *t, const TValue *key) {
- return mainposition(t, key);
-}
-
-int luaH_isdummy (Node *n) { return n == dummynode; }
-
-#endif
+++ /dev/null
-/*
-** $Id: ltable.h,v 2.10.1.1 2007/12/27 13:02:25 roberto Exp $
-** Lua tables (hash)
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ltable_h
-#define ltable_h
-
-#include "lobject.h"
-
-
-#define gnode(t,i) (&(t)->node[i])
-#define gkey(n) (&(n)->i_key.nk)
-#define gval(n) (&(n)->i_val)
-#define gnext(n) ((n)->i_key.nk.next)
-
-#define key2tval(n) (&(n)->i_key.tvk)
-
-
-LUAI_FUNC const TValue *luaH_getnum (Table *t, int key);
-LUAI_FUNC TValue *luaH_setnum (lua_State *L, Table *t, int key);
-LUAI_FUNC const TValue *luaH_getstr (Table *t, TString *key);
-LUAI_FUNC TValue *luaH_setstr (lua_State *L, Table *t, TString *key);
-LUAI_FUNC const TValue *luaH_get (Table *t, const TValue *key);
-LUAI_FUNC TValue *luaH_set (lua_State *L, Table *t, const TValue *key);
-LUAI_FUNC Table *luaH_new (lua_State *L, int narray, int lnhash);
-LUAI_FUNC void luaH_resizearray (lua_State *L, Table *t, int nasize);
-LUAI_FUNC void luaH_free (lua_State *L, Table *t);
-LUAI_FUNC int luaH_next (lua_State *L, Table *t, StkId key);
-LUAI_FUNC int luaH_getn (Table *t);
-
-
-#if defined(LUA_DEBUG)
-LUAI_FUNC Node *luaH_mainposition (const Table *t, const TValue *key);
-LUAI_FUNC int luaH_isdummy (Node *n);
-#endif
-
-
-#endif
+++ /dev/null
-/*
-** $Id: ltablib.c,v 1.38.1.3 2008/02/14 16:46:58 roberto Exp $
-** Library for Table Manipulation
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stddef.h>
-
-#define ltablib_c
-#define LUA_LIB
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-#define aux_getn(L,n) (luaL_checktype(L, n, LUA_TTABLE), luaL_getn(L, n))
-
-
-static int foreachi (lua_State *L) {
- int i;
- int n = aux_getn(L, 1);
- luaL_checktype(L, 2, LUA_TFUNCTION);
- for (i=1; i <= n; i++) {
- lua_pushvalue(L, 2); /* function */
- lua_pushinteger(L, i); /* 1st argument */
- lua_rawgeti(L, 1, i); /* 2nd argument */
- lua_call(L, 2, 1);
- if (!lua_isnil(L, -1))
- return 1;
- lua_pop(L, 1); /* remove nil result */
- }
- return 0;
-}
-
-
-static int foreach (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
- luaL_checktype(L, 2, LUA_TFUNCTION);
- lua_pushnil(L); /* first key */
- while (lua_next(L, 1)) {
- lua_pushvalue(L, 2); /* function */
- lua_pushvalue(L, -3); /* key */
- lua_pushvalue(L, -3); /* value */
- lua_call(L, 2, 1);
- if (!lua_isnil(L, -1))
- return 1;
- lua_pop(L, 2); /* remove value and result */
- }
- return 0;
-}
-
-
-static int maxn (lua_State *L) {
- lua_Number max = 0;
- luaL_checktype(L, 1, LUA_TTABLE);
- lua_pushnil(L); /* first key */
- while (lua_next(L, 1)) {
- lua_pop(L, 1); /* remove value */
- if (lua_type(L, -1) == LUA_TNUMBER) {
- lua_Number v = lua_tonumber(L, -1);
- if (v > max) max = v;
- }
- }
- lua_pushnumber(L, max);
- return 1;
-}
-
-
-static int getn (lua_State *L) {
- lua_pushinteger(L, aux_getn(L, 1));
- return 1;
-}
-
-
-static int setn (lua_State *L) {
- luaL_checktype(L, 1, LUA_TTABLE);
-#ifndef luaL_setn
- luaL_setn(L, 1, luaL_checkint(L, 2));
-#else
- luaL_error(L, LUA_QL("setn") " is obsolete");
-#endif
- lua_pushvalue(L, 1);
- return 1;
-}
-
-
-static int tinsert (lua_State *L) {
- int e = aux_getn(L, 1) + 1; /* first empty element */
- int pos; /* where to insert new element */
- switch (lua_gettop(L)) {
- case 2: { /* called with only 2 arguments */
- pos = e; /* insert new element at the end */
- break;
- }
- case 3: {
- int i;
- pos = luaL_checkint(L, 2); /* 2nd argument is the position */
- if (pos > e) e = pos; /* `grow' array if necessary */
- for (i = e; i > pos; i--) { /* move up elements */
- lua_rawgeti(L, 1, i-1);
- lua_rawseti(L, 1, i); /* t[i] = t[i-1] */
- }
- break;
- }
- default: {
- return luaL_error(L, "wrong number of arguments to " LUA_QL("insert"));
- }
- }
- luaL_setn(L, 1, e); /* new size */
- lua_rawseti(L, 1, pos); /* t[pos] = v */
- return 0;
-}
-
-
-static int tremove (lua_State *L) {
- int e = aux_getn(L, 1);
- int pos = luaL_optint(L, 2, e);
- if (!(1 <= pos && pos <= e)) /* position is outside bounds? */
- return 0; /* nothing to remove */
- luaL_setn(L, 1, e - 1); /* t.n = n-1 */
- lua_rawgeti(L, 1, pos); /* result = t[pos] */
- for ( ;pos<e; pos++) {
- lua_rawgeti(L, 1, pos+1);
- lua_rawseti(L, 1, pos); /* t[pos] = t[pos+1] */
- }
- lua_pushnil(L);
- lua_rawseti(L, 1, e); /* t[e] = nil */
- return 1;
-}
-
-
-static void addfield (lua_State *L, luaL_Buffer *b, int i) {
- lua_rawgeti(L, 1, i);
- if (!lua_isstring(L, -1))
- luaL_error(L, "invalid value (%s) at index %d in table for "
- LUA_QL("concat"), luaL_typename(L, -1), i);
- luaL_addvalue(b);
-}
-
-
-static int tconcat (lua_State *L) {
- luaL_Buffer b;
- size_t lsep;
- int i, last;
- const char *sep = luaL_optlstring(L, 2, "", &lsep);
- luaL_checktype(L, 1, LUA_TTABLE);
- i = luaL_optint(L, 3, 1);
- last = luaL_opt(L, luaL_checkint, 4, luaL_getn(L, 1));
- luaL_buffinit(L, &b);
- for (; i < last; i++) {
- addfield(L, &b, i);
- luaL_addlstring(&b, sep, lsep);
- }
- if (i == last) /* add last value (if interval was not empty) */
- addfield(L, &b, i);
- luaL_pushresult(&b);
- return 1;
-}
-
-
-
-/*
-** {======================================================
-** Quicksort
-** (based on `Algorithms in MODULA-3', Robert Sedgewick;
-** Addison-Wesley, 1993.)
-*/
-
-
-static void set2 (lua_State *L, int i, int j) {
- lua_rawseti(L, 1, i);
- lua_rawseti(L, 1, j);
-}
-
-static int sort_comp (lua_State *L, int a, int b) {
- if (!lua_isnil(L, 2)) { /* function? */
- int res;
- lua_pushvalue(L, 2);
- lua_pushvalue(L, a-1); /* -1 to compensate function */
- lua_pushvalue(L, b-2); /* -2 to compensate function and `a' */
- lua_call(L, 2, 1);
- res = lua_toboolean(L, -1);
- lua_pop(L, 1);
- return res;
- }
- else /* a < b? */
- return lua_lessthan(L, a, b);
-}
-
-static void auxsort (lua_State *L, int l, int u) {
- while (l < u) { /* for tail recursion */
- int i, j;
- /* sort elements a[l], a[(l+u)/2] and a[u] */
- lua_rawgeti(L, 1, l);
- lua_rawgeti(L, 1, u);
- if (sort_comp(L, -1, -2)) /* a[u] < a[l]? */
- set2(L, l, u); /* swap a[l] - a[u] */
- else
- lua_pop(L, 2);
- if (u-l == 1) break; /* only 2 elements */
- i = (l+u)/2;
- lua_rawgeti(L, 1, i);
- lua_rawgeti(L, 1, l);
- if (sort_comp(L, -2, -1)) /* a[i]<a[l]? */
- set2(L, i, l);
- else {
- lua_pop(L, 1); /* remove a[l] */
- lua_rawgeti(L, 1, u);
- if (sort_comp(L, -1, -2)) /* a[u]<a[i]? */
- set2(L, i, u);
- else
- lua_pop(L, 2);
- }
- if (u-l == 2) break; /* only 3 elements */
- lua_rawgeti(L, 1, i); /* Pivot */
- lua_pushvalue(L, -1);
- lua_rawgeti(L, 1, u-1);
- set2(L, i, u-1);
- /* a[l] <= P == a[u-1] <= a[u], only need to sort from l+1 to u-2 */
- i = l; j = u-1;
- for (;;) { /* invariant: a[l..i] <= P <= a[j..u] */
- /* repeat ++i until a[i] >= P */
- while (lua_rawgeti(L, 1, ++i), sort_comp(L, -1, -2)) {
- if (i>u) luaL_error(L, "invalid order function for sorting");
- lua_pop(L, 1); /* remove a[i] */
- }
- /* repeat --j until a[j] <= P */
- while (lua_rawgeti(L, 1, --j), sort_comp(L, -3, -1)) {
- if (j<l) luaL_error(L, "invalid order function for sorting");
- lua_pop(L, 1); /* remove a[j] */
- }
- if (j<i) {
- lua_pop(L, 3); /* pop pivot, a[i], a[j] */
- break;
- }
- set2(L, i, j);
- }
- lua_rawgeti(L, 1, u-1);
- lua_rawgeti(L, 1, i);
- set2(L, u-1, i); /* swap pivot (a[u-1]) with a[i] */
- /* a[l..i-1] <= a[i] == P <= a[i+1..u] */
- /* adjust so that smaller half is in [j..i] and larger one in [l..u] */
- if (i-l < u-i) {
- j=l; i=i-1; l=i+2;
- }
- else {
- j=i+1; i=u; u=j-2;
- }
- auxsort(L, j, i); /* call recursively the smaller one */
- } /* repeat the routine for the larger one */
-}
-
-static int sort (lua_State *L) {
- int n = aux_getn(L, 1);
- luaL_checkstack(L, 40, ""); /* assume array is smaller than 2^40 */
- if (!lua_isnoneornil(L, 2)) /* is there a 2nd argument? */
- luaL_checktype(L, 2, LUA_TFUNCTION);
- lua_settop(L, 2); /* make sure there is two arguments */
- auxsort(L, 1, n);
- return 0;
-}
-
-/* }====================================================== */
-
-
-static const luaL_Reg tab_funcs[] = {
- {"concat", tconcat},
- {"foreach", foreach},
- {"foreachi", foreachi},
- {"getn", getn},
- {"maxn", maxn},
- {"insert", tinsert},
- {"remove", tremove},
- {"setn", setn},
- {"sort", sort},
- {NULL, NULL}
-};
-
-
-LUALIB_API int luaopen_table (lua_State *L) {
- luaL_register(L, LUA_TABLIBNAME, tab_funcs);
- return 1;
-}
+++ /dev/null
-/*
-** $Id: ltm.c,v 2.8.1.1 2007/12/27 13:02:25 roberto Exp $
-** Tag methods
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define ltm_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "lobject.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-
-
-
-const char *const luaT_typenames[] = {
- "nil", "boolean", "userdata", "number",
- "string", "table", "function", "userdata", "thread",
- "proto", "upval"
-};
-
-
-void luaT_init (lua_State *L) {
- static const char *const luaT_eventname[] = { /* ORDER TM */
- "__index", "__newindex",
- "__gc", "__mode", "__eq",
- "__add", "__sub", "__mul", "__div", "__mod",
- "__pow", "__unm", "__len", "__lt", "__le",
- "__concat", "__call"
- };
- int i;
- for (i=0; i<TM_N; i++) {
- G(L)->tmname[i] = luaS_new(L, luaT_eventname[i]);
- luaS_fix(G(L)->tmname[i]); /* never collect these names */
- }
-}
-
-
-/*
-** function to be used with macro "fasttm": optimized for absence of
-** tag methods
-*/
-const TValue *luaT_gettm (Table *events, TMS event, TString *ename) {
- const TValue *tm = luaH_getstr(events, ename);
- lua_assert(event <= TM_EQ);
- if (ttisnil(tm)) { /* no tag method? */
- events->flags |= cast_byte(1u<<event); /* cache this fact */
- return NULL;
- }
- else return tm;
-}
-
-
-const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o, TMS event) {
- Table *mt;
- switch (ttype(o)) {
- case LUA_TTABLE:
- mt = hvalue(o)->metatable;
- break;
- case LUA_TUSERDATA:
- mt = uvalue(o)->metatable;
- break;
- default:
- mt = G(L)->mt[ttype(o)];
- }
- return (mt ? luaH_getstr(mt, G(L)->tmname[event]) : luaO_nilobject);
-}
+++ /dev/null
-/*
-** $Id: ltm.h,v 2.6.1.1 2007/12/27 13:02:25 roberto Exp $
-** Tag methods
-** See Copyright Notice in lua.h
-*/
-
-#ifndef ltm_h
-#define ltm_h
-
-
-#include "lobject.h"
-
-
-/*
-* WARNING: if you change the order of this enumeration,
-* grep "ORDER TM"
-*/
-typedef enum {
- TM_INDEX,
- TM_NEWINDEX,
- TM_GC,
- TM_MODE,
- TM_EQ, /* last tag method with `fast' access */
- TM_ADD,
- TM_SUB,
- TM_MUL,
- TM_DIV,
- TM_MOD,
- TM_POW,
- TM_UNM,
- TM_LEN,
- TM_LT,
- TM_LE,
- TM_CONCAT,
- TM_CALL,
- TM_N /* number of elements in the enum */
-} TMS;
-
-
-
-#define gfasttm(g,et,e) ((et) == NULL ? NULL : \
- ((et)->flags & (1u<<(e))) ? NULL : luaT_gettm(et, e, (g)->tmname[e]))
-
-#define fasttm(l,et,e) gfasttm(G(l), et, e)
-
-LUAI_DATA const char *const luaT_typenames[];
-
-
-LUAI_FUNC const TValue *luaT_gettm (Table *events, TMS event, TString *ename);
-LUAI_FUNC const TValue *luaT_gettmbyobj (lua_State *L, const TValue *o,
- TMS event);
-LUAI_FUNC void luaT_init (lua_State *L);
-
-#endif
+++ /dev/null
-/*
-** $Id: lua.c,v 1.160.1.2 2007/12/28 15:32:23 roberto Exp $
-** Lua stand-alone interpreter
-** See Copyright Notice in lua.h
-*/
-
-
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lua_c
-
-#include "lua.h"
-
-#include "lauxlib.h"
-#include "lualib.h"
-
-
-
-static lua_State *globalL = NULL;
-
-static const char *progname = LUA_PROGNAME;
-
-
-
-static void lstop (lua_State *L, lua_Debug *ar) {
- (void)ar; /* unused arg. */
- lua_sethook(L, NULL, 0, 0);
- luaL_error(L, "interrupted!");
-}
-
-
-static void laction (int i) {
- signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
- terminate process (default action) */
- lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
-}
-
-
-static void print_usage (void) {
- fprintf(stderr,
- "usage: %s [options] [script [args]].\n"
- "Available options are:\n"
- " -e stat execute string " LUA_QL("stat") "\n"
- " -l name require library " LUA_QL("name") "\n"
- " -i enter interactive mode after executing " LUA_QL("script") "\n"
- " -v show version information\n"
- " -- stop handling options\n"
- " - execute stdin and stop handling options\n"
- ,
- progname);
- fflush(stderr);
-}
-
-
-static void l_message (const char *pname, const char *msg) {
- if (pname) fprintf(stderr, "%s: ", pname);
- fprintf(stderr, "%s\n", msg);
- fflush(stderr);
-}
-
-
-static int report (lua_State *L, int status) {
- if (status && !lua_isnil(L, -1)) {
- const char *msg = lua_tostring(L, -1);
- if (msg == NULL) msg = "(error object is not a string)";
- l_message(progname, msg);
- lua_pop(L, 1);
- }
- return status;
-}
-
-
-static int traceback (lua_State *L) {
- if (!lua_isstring(L, 1)) /* 'message' not a string? */
- return 1; /* keep it intact */
- lua_getfield(L, LUA_GLOBALSINDEX, "debug");
- if (!lua_istable(L, -1)) {
- lua_pop(L, 1);
- return 1;
- }
- lua_getfield(L, -1, "traceback");
- if (!lua_isfunction(L, -1)) {
- lua_pop(L, 2);
- return 1;
- }
- lua_pushvalue(L, 1); /* pass error message */
- lua_pushinteger(L, 2); /* skip this function and traceback */
- lua_call(L, 2, 1); /* call debug.traceback */
- return 1;
-}
-
-
-static int docall (lua_State *L, int narg, int clear) {
- int status;
- int base = lua_gettop(L) - narg; /* function index */
- lua_pushcfunction(L, traceback); /* push traceback function */
- lua_insert(L, base); /* put it under chunk and args */
- signal(SIGINT, laction);
- status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
- signal(SIGINT, SIG_DFL);
- lua_remove(L, base); /* remove traceback function */
- /* force a complete garbage collection in case of errors */
- if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
- return status;
-}
-
-
-static void print_version (void) {
- l_message(NULL, LUA_RELEASE " " LUA_COPYRIGHT);
-}
-
-
-static int getargs (lua_State *L, char **argv, int n) {
- int narg;
- int i;
- int argc = 0;
- while (argv[argc]) argc++; /* count total number of arguments */
- narg = argc - (n + 1); /* number of arguments to the script */
- luaL_checkstack(L, narg + 3, "too many arguments to script");
- for (i=n+1; i < argc; i++)
- lua_pushstring(L, argv[i]);
- lua_createtable(L, narg, n + 1);
- for (i=0; i < argc; i++) {
- lua_pushstring(L, argv[i]);
- lua_rawseti(L, -2, i - n);
- }
- return narg;
-}
-
-
-static int dofile (lua_State *L, const char *name) {
- int status = luaL_loadfile(L, name) || docall(L, 0, 1);
- return report(L, status);
-}
-
-
-static int dostring (lua_State *L, const char *s, const char *name) {
- int status = luaL_loadbuffer(L, s, strlen(s), name) || docall(L, 0, 1);
- return report(L, status);
-}
-
-
-static int dolibrary (lua_State *L, const char *name) {
- lua_getglobal(L, "require");
- lua_pushstring(L, name);
- return report(L, docall(L, 1, 1));
-}
-
-
-static const char *get_prompt (lua_State *L, int firstline) {
- const char *p;
- lua_getfield(L, LUA_GLOBALSINDEX, firstline ? "_PROMPT" : "_PROMPT2");
- p = lua_tostring(L, -1);
- if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
- lua_pop(L, 1); /* remove global */
- return p;
-}
-
-
-static int incomplete (lua_State *L, int status) {
- if (status == LUA_ERRSYNTAX) {
- size_t lmsg;
- const char *msg = lua_tolstring(L, -1, &lmsg);
- const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
- if (strstr(msg, LUA_QL("<eof>")) == tp) {
- lua_pop(L, 1);
- return 1;
- }
- }
- return 0; /* else... */
-}
-
-
-static int pushline (lua_State *L, int firstline) {
- char buffer[LUA_MAXINPUT];
- char *b = buffer;
- size_t l;
- const char *prmt = get_prompt(L, firstline);
- if (lua_readline(L, b, prmt) == 0)
- return 0; /* no input */
- l = strlen(b);
- if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
- b[l-1] = '\0'; /* remove it */
- if (firstline && b[0] == '=') /* first line starts with `=' ? */
- lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
- else
- lua_pushstring(L, b);
- lua_freeline(L, b);
- return 1;
-}
-
-
-static int loadline (lua_State *L) {
- int status;
- lua_settop(L, 0);
- if (!pushline(L, 1))
- return -1; /* no input */
- for (;;) { /* repeat until gets a complete line */
- status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
- if (!incomplete(L, status)) break; /* cannot try to add lines? */
- if (!pushline(L, 0)) /* no more input? */
- return -1;
- lua_pushliteral(L, "\n"); /* add a new line... */
- lua_insert(L, -2); /* ...between the two lines */
- lua_concat(L, 3); /* join them */
- }
- lua_saveline(L, 1);
- lua_remove(L, 1); /* remove line */
- return status;
-}
-
-
-static void dotty (lua_State *L) {
- int status;
- const char *oldprogname = progname;
- progname = NULL;
- while ((status = loadline(L)) != -1) {
- if (status == 0) status = docall(L, 0, 0);
- report(L, status);
- if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
- lua_getglobal(L, "print");
- lua_insert(L, 1);
- if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
- l_message(progname, lua_pushfstring(L,
- "error calling " LUA_QL("print") " (%s)",
- lua_tostring(L, -1)));
- }
- }
- lua_settop(L, 0); /* clear stack */
- fputs("\n", stdout);
- fflush(stdout);
- progname = oldprogname;
-}
-
-
-static int handle_script (lua_State *L, char **argv, int n) {
- int status;
- const char *fname;
- int narg = getargs(L, argv, n); /* collect arguments */
- lua_setglobal(L, "arg");
- fname = argv[n];
- if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
- fname = NULL; /* stdin */
- status = luaL_loadfile(L, fname);
- lua_insert(L, -(narg+1));
- if (status == 0)
- status = docall(L, narg, 0);
- else
- lua_pop(L, narg);
- return report(L, status);
-}
-
-
-/* check that argument has no extra characters at the end */
-#define notail(x) {if ((x)[2] != '\0') return -1;}
-
-
-static int collectargs (char **argv, int *pi, int *pv, int *pe) {
- int i;
- for (i = 1; argv[i] != NULL; i++) {
- if (argv[i][0] != '-') /* not an option? */
- return i;
- switch (argv[i][1]) { /* option */
- case '-':
- notail(argv[i]);
- return (argv[i+1] != NULL ? i+1 : 0);
- case '\0':
- return i;
- case 'i':
- notail(argv[i]);
- *pi = 1; /* go through */
- case 'v':
- notail(argv[i]);
- *pv = 1;
- break;
- case 'e':
- *pe = 1; /* go through */
- case 'l':
- if (argv[i][2] == '\0') {
- i++;
- if (argv[i] == NULL) return -1;
- }
- break;
- default: return -1; /* invalid option */
- }
- }
- return 0;
-}
-
-
-static int runargs (lua_State *L, char **argv, int n) {
- int i;
- for (i = 1; i < n; i++) {
- if (argv[i] == NULL) continue;
- lua_assert(argv[i][0] == '-');
- switch (argv[i][1]) { /* option */
- case 'e': {
- const char *chunk = argv[i] + 2;
- if (*chunk == '\0') chunk = argv[++i];
- lua_assert(chunk != NULL);
- if (dostring(L, chunk, "=(command line)") != 0)
- return 1;
- break;
- }
- case 'l': {
- const char *filename = argv[i] + 2;
- if (*filename == '\0') filename = argv[++i];
- lua_assert(filename != NULL);
- if (dolibrary(L, filename))
- return 1; /* stop if file fails */
- break;
- }
- default: break;
- }
- }
- return 0;
-}
-
-
-static int handle_luainit (lua_State *L) {
- const char *init = getenv(LUA_INIT);
- if (init == NULL) return 0; /* status OK */
- else if (init[0] == '@')
- return dofile(L, init+1);
- else
- return dostring(L, init, "=" LUA_INIT);
-}
-
-
-struct Smain {
- int argc;
- char **argv;
- int status;
-};
-
-
-static int pmain (lua_State *L) {
- struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
- char **argv = s->argv;
- int script;
- int has_i = 0, has_v = 0, has_e = 0;
- globalL = L;
- if (argv[0] && argv[0][0]) progname = argv[0];
- lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
- luaL_openlibs(L); /* open libraries */
- lua_gc(L, LUA_GCRESTART, 0);
- s->status = handle_luainit(L);
- if (s->status != 0) return 0;
- script = collectargs(argv, &has_i, &has_v, &has_e);
- if (script < 0) { /* invalid args? */
- print_usage();
- s->status = 1;
- return 0;
- }
- if (has_v) print_version();
- s->status = runargs(L, argv, (script > 0) ? script : s->argc);
- if (s->status != 0) return 0;
- if (script)
- s->status = handle_script(L, argv, script);
- if (s->status != 0) return 0;
- if (has_i)
- dotty(L);
- else if (script == 0 && !has_e && !has_v) {
- if (lua_stdin_is_tty()) {
- print_version();
- dotty(L);
- }
- else dofile(L, NULL); /* executes stdin as a file */
- }
- return 0;
-}
-
-
-int main (int argc, char **argv) {
- int status;
- struct Smain s;
- lua_State *L = lua_open(); /* create state */
- if (L == NULL) {
- l_message(argv[0], "cannot create state: not enough memory");
- return EXIT_FAILURE;
- }
- s.argc = argc;
- s.argv = argv;
- status = lua_cpcall(L, &pmain, &s);
- report(L, status);
- lua_close(L);
- return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
-}
+++ /dev/null
-/*
-** $Id: lua.h,v 1.218.1.5 2008/08/06 13:30:12 roberto Exp $
-** Lua - An Extensible Extension Language
-** Lua.org, PUC-Rio, Brazil (http://www.lua.org)
-** See Copyright Notice at the end of this file
-*/
-
-
-#ifndef lua_h
-#define lua_h
-
-#include <stdarg.h>
-#include <stddef.h>
-
-
-#include "luaconf.h"
-
-
-#define LUA_VERSION "Lua 5.1"
-#define LUA_RELEASE "Lua 5.1.4"
-#define LUA_VERSION_NUM 501
-#define LUA_COPYRIGHT "Copyright (C) 1994-2008 Lua.org, PUC-Rio"
-#define LUA_AUTHORS "R. Ierusalimschy, L. H. de Figueiredo & W. Celes"
-
-
-/* mark for precompiled code (`<esc>Lua') */
-#define LUA_SIGNATURE "\033Lua"
-
-/* option for multiple returns in `lua_pcall' and `lua_call' */
-#define LUA_MULTRET (-1)
-
-
-/*
-** pseudo-indices
-*/
-#define LUA_REGISTRYINDEX (-10000)
-#define LUA_ENVIRONINDEX (-10001)
-#define LUA_GLOBALSINDEX (-10002)
-#define lua_upvalueindex(i) (LUA_GLOBALSINDEX-(i))
-
-
-/* thread status; 0 is OK */
-#define LUA_YIELD 1
-#define LUA_ERRRUN 2
-#define LUA_ERRSYNTAX 3
-#define LUA_ERRMEM 4
-#define LUA_ERRERR 5
-
-
-typedef struct lua_State lua_State;
-
-typedef int (*lua_CFunction) (lua_State *L);
-
-
-/*
-** functions that read/write blocks when loading/dumping Lua chunks
-*/
-typedef const char * (*lua_Reader) (lua_State *L, void *ud, size_t *sz);
-
-typedef int (*lua_Writer) (lua_State *L, const void* p, size_t sz, void* ud);
-
-
-/*
-** prototype for memory-allocation functions
-*/
-typedef void * (*lua_Alloc) (void *ud, void *ptr, size_t osize, size_t nsize);
-
-
-/*
-** basic types
-*/
-#define LUA_TNONE (-1)
-
-#define LUA_TNIL 0
-#define LUA_TBOOLEAN 1
-#define LUA_TLIGHTUSERDATA 2
-#define LUA_TNUMBER 3
-#define LUA_TSTRING 4
-#define LUA_TTABLE 5
-#define LUA_TFUNCTION 6
-#define LUA_TUSERDATA 7
-#define LUA_TTHREAD 8
-
-
-
-/* minimum Lua stack available to a C function */
-#define LUA_MINSTACK 20
-
-
-/*
-** generic extra include file
-*/
-#if defined(LUA_USER_H)
-#include LUA_USER_H
-#endif
-
-
-/* type of numbers in Lua */
-typedef LUA_NUMBER lua_Number;
-
-
-/* type for integer functions */
-typedef LUA_INTEGER lua_Integer;
-
-
-
-/*
-** state manipulation
-*/
-LUA_API lua_State *(lua_newstate) (lua_Alloc f, void *ud);
-LUA_API void (lua_close) (lua_State *L);
-LUA_API lua_State *(lua_newthread) (lua_State *L);
-
-LUA_API lua_CFunction (lua_atpanic) (lua_State *L, lua_CFunction panicf);
-
-
-/*
-** basic stack manipulation
-*/
-LUA_API int (lua_gettop) (lua_State *L);
-LUA_API void (lua_settop) (lua_State *L, int idx);
-LUA_API void (lua_pushvalue) (lua_State *L, int idx);
-LUA_API void (lua_remove) (lua_State *L, int idx);
-LUA_API void (lua_insert) (lua_State *L, int idx);
-LUA_API void (lua_replace) (lua_State *L, int idx);
-LUA_API int (lua_checkstack) (lua_State *L, int sz);
-
-LUA_API void (lua_xmove) (lua_State *from, lua_State *to, int n);
-
-
-/*
-** access functions (stack -> C)
-*/
-
-LUA_API int (lua_isnumber) (lua_State *L, int idx);
-LUA_API int (lua_isstring) (lua_State *L, int idx);
-LUA_API int (lua_iscfunction) (lua_State *L, int idx);
-LUA_API int (lua_isuserdata) (lua_State *L, int idx);
-LUA_API int (lua_type) (lua_State *L, int idx);
-LUA_API const char *(lua_typename) (lua_State *L, int tp);
-
-LUA_API int (lua_equal) (lua_State *L, int idx1, int idx2);
-LUA_API int (lua_rawequal) (lua_State *L, int idx1, int idx2);
-LUA_API int (lua_lessthan) (lua_State *L, int idx1, int idx2);
-
-LUA_API lua_Number (lua_tonumber) (lua_State *L, int idx);
-LUA_API lua_Integer (lua_tointeger) (lua_State *L, int idx);
-LUA_API int (lua_toboolean) (lua_State *L, int idx);
-LUA_API const char *(lua_tolstring) (lua_State *L, int idx, size_t *len);
-LUA_API size_t (lua_objlen) (lua_State *L, int idx);
-LUA_API lua_CFunction (lua_tocfunction) (lua_State *L, int idx);
-LUA_API void *(lua_touserdata) (lua_State *L, int idx);
-LUA_API lua_State *(lua_tothread) (lua_State *L, int idx);
-LUA_API const void *(lua_topointer) (lua_State *L, int idx);
-
-
-/*
-** push functions (C -> stack)
-*/
-LUA_API void (lua_pushnil) (lua_State *L);
-LUA_API void (lua_pushnumber) (lua_State *L, lua_Number n);
-LUA_API void (lua_pushinteger) (lua_State *L, lua_Integer n);
-LUA_API void (lua_pushlstring) (lua_State *L, const char *s, size_t l);
-LUA_API void (lua_pushstring) (lua_State *L, const char *s);
-LUA_API const char *(lua_pushvfstring) (lua_State *L, const char *fmt,
- va_list argp);
-LUA_API const char *(lua_pushfstring) (lua_State *L, const char *fmt, ...);
-LUA_API void (lua_pushcclosure) (lua_State *L, lua_CFunction fn, int n);
-LUA_API void (lua_pushboolean) (lua_State *L, int b);
-LUA_API void (lua_pushlightuserdata) (lua_State *L, void *p);
-LUA_API int (lua_pushthread) (lua_State *L);
-
-
-/*
-** get functions (Lua -> stack)
-*/
-LUA_API void (lua_gettable) (lua_State *L, int idx);
-LUA_API void (lua_getfield) (lua_State *L, int idx, const char *k);
-LUA_API void (lua_rawget) (lua_State *L, int idx);
-LUA_API void (lua_rawgeti) (lua_State *L, int idx, int n);
-LUA_API void (lua_createtable) (lua_State *L, int narr, int nrec);
-LUA_API void *(lua_newuserdata) (lua_State *L, size_t sz);
-LUA_API int (lua_getmetatable) (lua_State *L, int objindex);
-LUA_API void (lua_getfenv) (lua_State *L, int idx);
-
-
-/*
-** set functions (stack -> Lua)
-*/
-LUA_API void (lua_settable) (lua_State *L, int idx);
-LUA_API void (lua_setfield) (lua_State *L, int idx, const char *k);
-LUA_API void (lua_rawset) (lua_State *L, int idx);
-LUA_API void (lua_rawseti) (lua_State *L, int idx, int n);
-LUA_API int (lua_setmetatable) (lua_State *L, int objindex);
-LUA_API int (lua_setfenv) (lua_State *L, int idx);
-
-
-/*
-** `load' and `call' functions (load and run Lua code)
-*/
-LUA_API void (lua_call) (lua_State *L, int nargs, int nresults);
-LUA_API int (lua_pcall) (lua_State *L, int nargs, int nresults, int errfunc);
-LUA_API int (lua_cpcall) (lua_State *L, lua_CFunction func, void *ud);
-LUA_API int (lua_load) (lua_State *L, lua_Reader reader, void *dt,
- const char *chunkname);
-
-LUA_API int (lua_dump) (lua_State *L, lua_Writer writer, void *data);
-
-
-/*
-** coroutine functions
-*/
-LUA_API int (lua_yield) (lua_State *L, int nresults);
-LUA_API int (lua_resume) (lua_State *L, int narg);
-LUA_API int (lua_status) (lua_State *L);
-
-/*
-** garbage-collection function and options
-*/
-
-#define LUA_GCSTOP 0
-#define LUA_GCRESTART 1
-#define LUA_GCCOLLECT 2
-#define LUA_GCCOUNT 3
-#define LUA_GCCOUNTB 4
-#define LUA_GCSTEP 5
-#define LUA_GCSETPAUSE 6
-#define LUA_GCSETSTEPMUL 7
-
-LUA_API int (lua_gc) (lua_State *L, int what, int data);
-
-
-/*
-** miscellaneous functions
-*/
-
-LUA_API int (lua_error) (lua_State *L);
-
-LUA_API int (lua_next) (lua_State *L, int idx);
-
-LUA_API void (lua_concat) (lua_State *L, int n);
-
-LUA_API lua_Alloc (lua_getallocf) (lua_State *L, void **ud);
-LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud);
-
-
-
-/*
-** ===============================================================
-** some useful macros
-** ===============================================================
-*/
-
-#define lua_pop(L,n) lua_settop(L, -(n)-1)
-
-#define lua_newtable(L) lua_createtable(L, 0, 0)
-
-#define lua_register(L,n,f) (lua_pushcfunction(L, (f)), lua_setglobal(L, (n)))
-
-#define lua_pushcfunction(L,f) lua_pushcclosure(L, (f), 0)
-
-#define lua_strlen(L,i) lua_objlen(L, (i))
-
-#define lua_isfunction(L,n) (lua_type(L, (n)) == LUA_TFUNCTION)
-#define lua_istable(L,n) (lua_type(L, (n)) == LUA_TTABLE)
-#define lua_islightuserdata(L,n) (lua_type(L, (n)) == LUA_TLIGHTUSERDATA)
-#define lua_isnil(L,n) (lua_type(L, (n)) == LUA_TNIL)
-#define lua_isboolean(L,n) (lua_type(L, (n)) == LUA_TBOOLEAN)
-#define lua_isthread(L,n) (lua_type(L, (n)) == LUA_TTHREAD)
-#define lua_isnone(L,n) (lua_type(L, (n)) == LUA_TNONE)
-#define lua_isnoneornil(L, n) (lua_type(L, (n)) <= 0)
-
-#define lua_pushliteral(L, s) \
- lua_pushlstring(L, "" s, (sizeof(s)/sizeof(char))-1)
-
-#define lua_setglobal(L,s) lua_setfield(L, LUA_GLOBALSINDEX, (s))
-#define lua_getglobal(L,s) lua_getfield(L, LUA_GLOBALSINDEX, (s))
-
-#define lua_tostring(L,i) lua_tolstring(L, (i), NULL)
-
-
-
-/*
-** compatibility macros and functions
-*/
-
-#define lua_open() luaL_newstate()
-
-#define lua_getregistry(L) lua_pushvalue(L, LUA_REGISTRYINDEX)
-
-#define lua_getgccount(L) lua_gc(L, LUA_GCCOUNT, 0)
-
-#define lua_Chunkreader lua_Reader
-#define lua_Chunkwriter lua_Writer
-
-
-/* hack */
-LUA_API void lua_setlevel (lua_State *from, lua_State *to);
-
-
-/*
-** {======================================================================
-** Debug API
-** =======================================================================
-*/
-
-
-/*
-** Event codes
-*/
-#define LUA_HOOKCALL 0
-#define LUA_HOOKRET 1
-#define LUA_HOOKLINE 2
-#define LUA_HOOKCOUNT 3
-#define LUA_HOOKTAILRET 4
-
-
-/*
-** Event masks
-*/
-#define LUA_MASKCALL (1 << LUA_HOOKCALL)
-#define LUA_MASKRET (1 << LUA_HOOKRET)
-#define LUA_MASKLINE (1 << LUA_HOOKLINE)
-#define LUA_MASKCOUNT (1 << LUA_HOOKCOUNT)
-
-typedef struct lua_Debug lua_Debug; /* activation record */
-
-
-/* Functions to be called by the debuger in specific events */
-typedef void (*lua_Hook) (lua_State *L, lua_Debug *ar);
-
-
-LUA_API int lua_getstack (lua_State *L, int level, lua_Debug *ar);
-LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar);
-LUA_API const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int n);
-LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n);
-LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n);
-LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n);
-
-LUA_API int lua_sethook (lua_State *L, lua_Hook func, int mask, int count);
-LUA_API lua_Hook lua_gethook (lua_State *L);
-LUA_API int lua_gethookmask (lua_State *L);
-LUA_API int lua_gethookcount (lua_State *L);
-
-
-struct lua_Debug {
- int event;
- const char *name; /* (n) */
- const char *namewhat; /* (n) `global', `local', `field', `method' */
- const char *what; /* (S) `Lua', `C', `main', `tail' */
- const char *source; /* (S) */
- int currentline; /* (l) */
- int nups; /* (u) number of upvalues */
- int linedefined; /* (S) */
- int lastlinedefined; /* (S) */
- char short_src[LUA_IDSIZE]; /* (S) */
- /* private part */
- int i_ci; /* active function */
-};
-
-/* }====================================================================== */
-
-
-/******************************************************************************
-* Copyright (C) 1994-2008 Lua.org, PUC-Rio. All rights reserved.
-*
-* Permission is hereby granted, free of charge, to any person obtaining
-* a copy of this software and associated documentation files (the
-* "Software"), to deal in the Software without restriction, including
-* without limitation the rights to use, copy, modify, merge, publish,
-* distribute, sublicense, and/or sell copies of the Software, and to
-* permit persons to whom the Software is furnished to do so, subject to
-* the following conditions:
-*
-* The above copyright notice and this permission notice shall be
-* included in all copies or substantial portions of the Software.
-*
-* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-******************************************************************************/
-
-
-#endif
+++ /dev/null
-/*
-** $Id: luac.c,v 1.54 2006/06/02 17:37:11 lhf Exp $
-** Lua compiler (saves bytecodes to files; also list bytecodes)
-** See Copyright Notice in lua.h
-*/
-
-#include <errno.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define luac_c
-#define LUA_CORE
-
-#include "lua.h"
-#include "lauxlib.h"
-
-#include "ldo.h"
-#include "lfunc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstring.h"
-#include "lundump.h"
-
-#define PROGNAME "luac" /* default program name */
-#define OUTPUT PROGNAME ".out" /* default output file */
-
-static int listing=0; /* list bytecodes? */
-static int dumping=1; /* dump bytecodes? */
-static int stripping=0; /* strip debug information? */
-static char Output[]={ OUTPUT }; /* default output file name */
-static const char* output=Output; /* actual output file name */
-static const char* progname=PROGNAME; /* actual program name */
-
-static void fatal(const char* message)
-{
- fprintf(stderr,"%s: %s\n",progname,message);
- exit(EXIT_FAILURE);
-}
-
-static void cannot(const char* what)
-{
- fprintf(stderr,"%s: cannot %s %s: %s\n",progname,what,output,strerror(errno));
- exit(EXIT_FAILURE);
-}
-
-static void usage(const char* message)
-{
- if (*message=='-')
- fprintf(stderr,"%s: unrecognized option " LUA_QS "\n",progname,message);
- else
- fprintf(stderr,"%s: %s\n",progname,message);
- fprintf(stderr,
- "usage: %s [options] [filenames].\n"
- "Available options are:\n"
- " - process stdin\n"
- " -l list\n"
- " -o name output to file " LUA_QL("name") " (default is \"%s\")\n"
- " -p parse only\n"
- " -s strip debug information\n"
- " -v show version information\n"
- " -- stop handling options\n",
- progname,Output);
- exit(EXIT_FAILURE);
-}
-
-#define IS(s) (strcmp(argv[i],s)==0)
-
-static int doargs(int argc, char* argv[])
-{
- int i;
- int version=0;
- if (argv[0]!=NULL && *argv[0]!=0) progname=argv[0];
- for (i=1; i<argc; i++)
- {
- if (*argv[i]!='-') /* end of options; keep it */
- break;
- else if (IS("--")) /* end of options; skip it */
- {
- ++i;
- if (version) ++version;
- break;
- }
- else if (IS("-")) /* end of options; use stdin */
- break;
- else if (IS("-l")) /* list */
- ++listing;
- else if (IS("-o")) /* output file */
- {
- output=argv[++i];
- if (output==NULL || *output==0) usage(LUA_QL("-o") " needs argument");
- if (IS("-")) output=NULL;
- }
- else if (IS("-p")) /* parse only */
- dumping=0;
- else if (IS("-s")) /* strip debug information */
- stripping=1;
- else if (IS("-v")) /* show version */
- ++version;
- else /* unknown option */
- usage(argv[i]);
- }
- if (i==argc && (listing || !dumping))
- {
- dumping=0;
- argv[--i]=Output;
- }
- if (version)
- {
- printf("%s %s\n",LUA_RELEASE,LUA_COPYRIGHT);
- if (version==argc-1) exit(EXIT_SUCCESS);
- }
- return i;
-}
-
-#define toproto(L,i) (clvalue(L->top+(i))->l.p)
-
-static const Proto* combine(lua_State* L, int n)
-{
- if (n==1)
- return toproto(L,-1);
- else
- {
- int i,pc;
- Proto* f=luaF_newproto(L);
- setptvalue2s(L,L->top,f); incr_top(L);
- f->source=luaS_newliteral(L,"=(" PROGNAME ")");
- f->maxstacksize=1;
- pc=2*n+1;
- f->code=luaM_newvector(L,pc,Instruction);
- f->sizecode=pc;
- f->p=luaM_newvector(L,n,Proto*);
- f->sizep=n;
- pc=0;
- for (i=0; i<n; i++)
- {
- f->p[i]=toproto(L,i-n-1);
- f->code[pc++]=CREATE_ABx(OP_CLOSURE,0,i);
- f->code[pc++]=CREATE_ABC(OP_CALL,0,1,1);
- }
- f->code[pc++]=CREATE_ABC(OP_RETURN,0,1,0);
- return f;
- }
-}
-
-static int writer(lua_State* L, const void* p, size_t size, void* u)
-{
- UNUSED(L);
- return (fwrite(p,size,1,(FILE*)u)!=1) && (size!=0);
-}
-
-struct Smain {
- int argc;
- char** argv;
-};
-
-static int pmain(lua_State* L)
-{
- struct Smain* s = (struct Smain*)lua_touserdata(L, 1);
- int argc=s->argc;
- char** argv=s->argv;
- const Proto* f;
- int i;
- if (!lua_checkstack(L,argc)) fatal("too many input files");
- for (i=0; i<argc; i++)
- {
- const char* filename=IS("-") ? NULL : argv[i];
- if (luaL_loadfile(L,filename)!=0) fatal(lua_tostring(L,-1));
- }
- f=combine(L,argc);
- if (listing) luaU_print(f,listing>1);
- if (dumping)
- {
- FILE* D= (output==NULL) ? stdout : fopen(output,"wb");
- if (D==NULL) cannot("open");
- lua_lock(L);
- luaU_dump(L,f,writer,D,stripping);
- lua_unlock(L);
- if (ferror(D)) cannot("write");
- if (fclose(D)) cannot("close");
- }
- return 0;
-}
-
-int main(int argc, char* argv[])
-{
- lua_State* L;
- struct Smain s;
- int i=doargs(argc,argv);
- argc-=i; argv+=i;
- if (argc<=0) usage("no input files given");
- L=lua_open();
- if (L==NULL) fatal("not enough memory for state");
- s.argc=argc;
- s.argv=argv;
- if (lua_cpcall(L,pmain,&s)!=0) fatal(lua_tostring(L,-1));
- lua_close(L);
- return EXIT_SUCCESS;
-}
+++ /dev/null
-/*
-** $Id: luaconf.h,v 1.82.1.7 2008/02/11 16:25:08 roberto Exp $
-** Configuration file for Lua
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lconfig_h
-#define lconfig_h
-
-#include <limits.h>
-#include <stddef.h>
-
-
-/*
-** ==================================================================
-** Search for "@@" to find all configurable definitions.
-** ===================================================================
-*/
-
-
-/*
-@@ LUA_ANSI controls the use of non-ansi features.
-** CHANGE it (define it) if you want Lua to avoid the use of any
-** non-ansi feature or library.
-*/
-#if defined(__STRICT_ANSI__)
-#define LUA_ANSI
-#endif
-
-
-#if !defined(LUA_ANSI) && defined(_WIN32)
-#define LUA_WIN
-#endif
-
-#if defined(LUA_USE_LINUX)
-#define LUA_USE_POSIX
-#define LUA_USE_DLOPEN /* needs an extra library: -ldl */
-#define LUA_USE_READLINE /* needs some extra libraries */
-#endif
-
-#if defined(LUA_USE_MACOSX)
-#define LUA_USE_POSIX
-#define LUA_DL_DYLD /* does not need extra library */
-#endif
-
-
-
-/*
-@@ LUA_USE_POSIX includes all functionallity listed as X/Open System
-@* Interfaces Extension (XSI).
-** CHANGE it (define it) if your system is XSI compatible.
-*/
-#if defined(LUA_USE_POSIX)
-#define LUA_USE_MKSTEMP
-#define LUA_USE_ISATTY
-#define LUA_USE_POPEN
-#define LUA_USE_ULONGJMP
-#endif
-
-
-/*
-@@ LUA_PATH and LUA_CPATH are the names of the environment variables that
-@* Lua check to set its paths.
-@@ LUA_INIT is the name of the environment variable that Lua
-@* checks for initialization code.
-** CHANGE them if you want different names.
-*/
-#define LUA_PATH "LUA_PATH"
-#define LUA_CPATH "LUA_CPATH"
-#define LUA_INIT "LUA_INIT"
-
-
-/*
-@@ LUA_PATH_DEFAULT is the default path that Lua uses to look for
-@* Lua libraries.
-@@ LUA_CPATH_DEFAULT is the default path that Lua uses to look for
-@* C libraries.
-** CHANGE them if your machine has a non-conventional directory
-** hierarchy or if you want to install your libraries in
-** non-conventional directories.
-*/
-#if defined(_WIN32)
-/*
-** In Windows, any exclamation mark ('!') in the path is replaced by the
-** path of the directory of the executable file of the current process.
-*/
-#define LUA_LDIR "!\\lua\\"
-#define LUA_CDIR "!\\"
-#define LUA_PATH_DEFAULT \
- ".\\?.lua;" LUA_LDIR"?.lua;" LUA_LDIR"?\\init.lua;" \
- LUA_CDIR"?.lua;" LUA_CDIR"?\\init.lua"
-#define LUA_CPATH_DEFAULT \
- ".\\?.dll;" LUA_CDIR"?.dll;" LUA_CDIR"loadall.dll"
-
-#else
-#define LUA_ROOT "/usr/local/"
-#define LUA_LDIR LUA_ROOT "share/lua/5.1/"
-#define LUA_CDIR LUA_ROOT "lib/lua/5.1/"
-#define LUA_PATH_DEFAULT \
- "./?.lua;" LUA_LDIR"?.lua;" LUA_LDIR"?/init.lua;" \
- LUA_CDIR"?.lua;" LUA_CDIR"?/init.lua"
-#define LUA_CPATH_DEFAULT \
- "./?.so;" LUA_CDIR"?.so;" LUA_CDIR"loadall.so"
-#endif
-
-
-/*
-@@ LUA_DIRSEP is the directory separator (for submodules).
-** CHANGE it if your machine does not use "/" as the directory separator
-** and is not Windows. (On Windows Lua automatically uses "\".)
-*/
-#if defined(_WIN32)
-#define LUA_DIRSEP "\\"
-#else
-#define LUA_DIRSEP "/"
-#endif
-
-
-/*
-@@ LUA_PATHSEP is the character that separates templates in a path.
-@@ LUA_PATH_MARK is the string that marks the substitution points in a
-@* template.
-@@ LUA_EXECDIR in a Windows path is replaced by the executable's
-@* directory.
-@@ LUA_IGMARK is a mark to ignore all before it when bulding the
-@* luaopen_ function name.
-** CHANGE them if for some reason your system cannot use those
-** characters. (E.g., if one of those characters is a common character
-** in file/directory names.) Probably you do not need to change them.
-*/
-#define LUA_PATHSEP ";"
-#define LUA_PATH_MARK "?"
-#define LUA_EXECDIR "!"
-#define LUA_IGMARK "-"
-
-
-/*
-@@ LUA_INTEGER is the integral type used by lua_pushinteger/lua_tointeger.
-** CHANGE that if ptrdiff_t is not adequate on your machine. (On most
-** machines, ptrdiff_t gives a good choice between int or long.)
-*/
-#define LUA_INTEGER ptrdiff_t
-
-
-/*
-@@ LUA_API is a mark for all core API functions.
-@@ LUALIB_API is a mark for all standard library functions.
-** CHANGE them if you need to define those functions in some special way.
-** For instance, if you want to create one Windows DLL with the core and
-** the libraries, you may want to use the following definition (define
-** LUA_BUILD_AS_DLL to get it).
-*/
-#if defined(LUA_BUILD_AS_DLL)
-
-#if defined(LUA_CORE) || defined(LUA_LIB)
-#define LUA_API __declspec(dllexport)
-#else
-#define LUA_API __declspec(dllimport)
-#endif
-
-#else
-
-#define LUA_API extern
-
-#endif
-
-/* more often than not the libs go together with the core */
-#define LUALIB_API LUA_API
-
-
-/*
-@@ LUAI_FUNC is a mark for all extern functions that are not to be
-@* exported to outside modules.
-@@ LUAI_DATA is a mark for all extern (const) variables that are not to
-@* be exported to outside modules.
-** CHANGE them if you need to mark them in some special way. Elf/gcc
-** (versions 3.2 and later) mark them as "hidden" to optimize access
-** when Lua is compiled as a shared library.
-*/
-#if defined(luaall_c)
-#define LUAI_FUNC static
-#define LUAI_DATA /* empty */
-
-#elif defined(__GNUC__) && ((__GNUC__*100 + __GNUC_MINOR__) >= 302) && \
- defined(__ELF__)
-#define LUAI_FUNC __attribute__((visibility("hidden"))) extern
-#define LUAI_DATA LUAI_FUNC
-
-#else
-#define LUAI_FUNC extern
-#define LUAI_DATA extern
-#endif
-
-
-
-/*
-@@ LUA_QL describes how error messages quote program elements.
-** CHANGE it if you want a different appearance.
-*/
-#define LUA_QL(x) "'" x "'"
-#define LUA_QS LUA_QL("%s")
-
-
-/*
-@@ LUA_IDSIZE gives the maximum size for the description of the source
-@* of a function in debug information.
-** CHANGE it if you want a different size.
-*/
-#define LUA_IDSIZE 60
-
-
-/*
-** {==================================================================
-** Stand-alone configuration
-** ===================================================================
-*/
-
-#if defined(lua_c) || defined(luaall_c)
-
-/*
-@@ lua_stdin_is_tty detects whether the standard input is a 'tty' (that
-@* is, whether we're running lua interactively).
-** CHANGE it if you have a better definition for non-POSIX/non-Windows
-** systems.
-*/
-#if defined(LUA_USE_ISATTY)
-#include <unistd.h>
-#define lua_stdin_is_tty() isatty(0)
-#elif defined(LUA_WIN)
-#include <io.h>
-#include <stdio.h>
-#define lua_stdin_is_tty() _isatty(_fileno(stdin))
-#else
-#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
-#endif
-
-
-/*
-@@ LUA_PROMPT is the default prompt used by stand-alone Lua.
-@@ LUA_PROMPT2 is the default continuation prompt used by stand-alone Lua.
-** CHANGE them if you want different prompts. (You can also change the
-** prompts dynamically, assigning to globals _PROMPT/_PROMPT2.)
-*/
-#define LUA_PROMPT "> "
-#define LUA_PROMPT2 ">> "
-
-
-/*
-@@ LUA_PROGNAME is the default name for the stand-alone Lua program.
-** CHANGE it if your stand-alone interpreter has a different name and
-** your system is not able to detect that name automatically.
-*/
-#define LUA_PROGNAME "lua"
-
-
-/*
-@@ LUA_MAXINPUT is the maximum length for an input line in the
-@* stand-alone interpreter.
-** CHANGE it if you need longer lines.
-*/
-#define LUA_MAXINPUT 512
-
-
-/*
-@@ lua_readline defines how to show a prompt and then read a line from
-@* the standard input.
-@@ lua_saveline defines how to "save" a read line in a "history".
-@@ lua_freeline defines how to free a line read by lua_readline.
-** CHANGE them if you want to improve this functionality (e.g., by using
-** GNU readline and history facilities).
-*/
-#if defined(LUA_USE_READLINE)
-#include <stdio.h>
-#include <readline/readline.h>
-#include <readline/history.h>
-#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
-#define lua_saveline(L,idx) \
- if (lua_strlen(L,idx) > 0) /* non-empty line? */ \
- add_history(lua_tostring(L, idx)); /* add it to history */
-#define lua_freeline(L,b) ((void)L, free(b))
-#else
-#define lua_readline(L,b,p) \
- ((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
- fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
-#define lua_saveline(L,idx) { (void)L; (void)idx; }
-#define lua_freeline(L,b) { (void)L; (void)b; }
-#endif
-
-#endif
-
-/* }================================================================== */
-
-
-/*
-@@ LUAI_GCPAUSE defines the default pause between garbage-collector cycles
-@* as a percentage.
-** CHANGE it if you want the GC to run faster or slower (higher values
-** mean larger pauses which mean slower collection.) You can also change
-** this value dynamically.
-*/
-#define LUAI_GCPAUSE 200 /* 200% (wait memory to double before next GC) */
-
-
-/*
-@@ LUAI_GCMUL defines the default speed of garbage collection relative to
-@* memory allocation as a percentage.
-** CHANGE it if you want to change the granularity of the garbage
-** collection. (Higher values mean coarser collections. 0 represents
-** infinity, where each step performs a full collection.) You can also
-** change this value dynamically.
-*/
-#define LUAI_GCMUL 200 /* GC runs 'twice the speed' of memory allocation */
-
-
-
-/*
-@@ LUA_COMPAT_GETN controls compatibility with old getn behavior.
-** CHANGE it (define it) if you want exact compatibility with the
-** behavior of setn/getn in Lua 5.0.
-*/
-#undef LUA_COMPAT_GETN
-
-/*
-@@ LUA_COMPAT_LOADLIB controls compatibility about global loadlib.
-** CHANGE it to undefined as soon as you do not need a global 'loadlib'
-** function (the function is still available as 'package.loadlib').
-*/
-#undef LUA_COMPAT_LOADLIB
-
-/*
-@@ LUA_COMPAT_VARARG controls compatibility with old vararg feature.
-** CHANGE it to undefined as soon as your programs use only '...' to
-** access vararg parameters (instead of the old 'arg' table).
-*/
-#define LUA_COMPAT_VARARG
-
-/*
-@@ LUA_COMPAT_MOD controls compatibility with old math.mod function.
-** CHANGE it to undefined as soon as your programs use 'math.fmod' or
-** the new '%' operator instead of 'math.mod'.
-*/
-#define LUA_COMPAT_MOD
-
-/*
-@@ LUA_COMPAT_LSTR controls compatibility with old long string nesting
-@* facility.
-** CHANGE it to 2 if you want the old behaviour, or undefine it to turn
-** off the advisory error when nesting [[...]].
-*/
-#define LUA_COMPAT_LSTR 1
-
-/*
-@@ LUA_COMPAT_GFIND controls compatibility with old 'string.gfind' name.
-** CHANGE it to undefined as soon as you rename 'string.gfind' to
-** 'string.gmatch'.
-*/
-#define LUA_COMPAT_GFIND
-
-/*
-@@ LUA_COMPAT_OPENLIB controls compatibility with old 'luaL_openlib'
-@* behavior.
-** CHANGE it to undefined as soon as you replace to 'luaL_register'
-** your uses of 'luaL_openlib'
-*/
-#define LUA_COMPAT_OPENLIB
-
-
-
-/*
-@@ luai_apicheck is the assert macro used by the Lua-C API.
-** CHANGE luai_apicheck if you want Lua to perform some checks in the
-** parameters it gets from API calls. This may slow down the interpreter
-** a bit, but may be quite useful when debugging C code that interfaces
-** with Lua. A useful redefinition is to use assert.h.
-*/
-#if defined(LUA_USE_APICHECK)
-#include <assert.h>
-#define luai_apicheck(L,o) { (void)L; assert(o); }
-#else
-#define luai_apicheck(L,o) { (void)L; }
-#endif
-
-
-/*
-@@ LUAI_BITSINT defines the number of bits in an int.
-** CHANGE here if Lua cannot automatically detect the number of bits of
-** your machine. Probably you do not need to change this.
-*/
-/* avoid overflows in comparison */
-#if INT_MAX-20 < 32760
-#define LUAI_BITSINT 16
-#elif INT_MAX > 2147483640L
-/* int has at least 32 bits */
-#define LUAI_BITSINT 32
-#else
-#error "you must define LUA_BITSINT with number of bits in an integer"
-#endif
-
-
-/*
-@@ LUAI_UINT32 is an unsigned integer with at least 32 bits.
-@@ LUAI_INT32 is an signed integer with at least 32 bits.
-@@ LUAI_UMEM is an unsigned integer big enough to count the total
-@* memory used by Lua.
-@@ LUAI_MEM is a signed integer big enough to count the total memory
-@* used by Lua.
-** CHANGE here if for some weird reason the default definitions are not
-** good enough for your machine. (The definitions in the 'else'
-** part always works, but may waste space on machines with 64-bit
-** longs.) Probably you do not need to change this.
-*/
-#if LUAI_BITSINT >= 32
-#define LUAI_UINT32 unsigned int
-#define LUAI_INT32 int
-#define LUAI_MAXINT32 INT_MAX
-#define LUAI_UMEM size_t
-#define LUAI_MEM ptrdiff_t
-#else
-/* 16-bit ints */
-#define LUAI_UINT32 unsigned long
-#define LUAI_INT32 long
-#define LUAI_MAXINT32 LONG_MAX
-#define LUAI_UMEM unsigned long
-#define LUAI_MEM long
-#endif
-
-
-/*
-@@ LUAI_MAXCALLS limits the number of nested calls.
-** CHANGE it if you need really deep recursive calls. This limit is
-** arbitrary; its only purpose is to stop infinite recursion before
-** exhausting memory.
-*/
-#define LUAI_MAXCALLS 20000
-
-
-/*
-@@ LUAI_MAXCSTACK limits the number of Lua stack slots that a C function
-@* can use.
-** CHANGE it if you need lots of (Lua) stack space for your C
-** functions. This limit is arbitrary; its only purpose is to stop C
-** functions to consume unlimited stack space. (must be smaller than
-** -LUA_REGISTRYINDEX)
-*/
-#define LUAI_MAXCSTACK 8000
-
-
-
-/*
-** {==================================================================
-** CHANGE (to smaller values) the following definitions if your system
-** has a small C stack. (Or you may want to change them to larger
-** values if your system has a large C stack and these limits are
-** too rigid for you.) Some of these constants control the size of
-** stack-allocated arrays used by the compiler or the interpreter, while
-** others limit the maximum number of recursive calls that the compiler
-** or the interpreter can perform. Values too large may cause a C stack
-** overflow for some forms of deep constructs.
-** ===================================================================
-*/
-
-
-/*
-@@ LUAI_MAXCCALLS is the maximum depth for nested C calls (short) and
-@* syntactical nested non-terminals in a program.
-*/
-#define LUAI_MAXCCALLS 200
-
-
-/*
-@@ LUAI_MAXVARS is the maximum number of local variables per function
-@* (must be smaller than 250).
-*/
-#define LUAI_MAXVARS 200
-
-
-/*
-@@ LUAI_MAXUPVALUES is the maximum number of upvalues per function
-@* (must be smaller than 250).
-*/
-#define LUAI_MAXUPVALUES 60
-
-
-/*
-@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
-*/
-#define LUAL_BUFFERSIZE BUFSIZ
-
-/* }================================================================== */
-
-
-
-
-/*
-** {==================================================================
-@@ LUA_NUMBER is the type of numbers in Lua.
-** CHANGE the following definitions only if you want to build Lua
-** with a number type different from double. You may also need to
-** change lua_number2int & lua_number2integer.
-** ===================================================================
-*/
-
-#define LUA_NUMBER_DOUBLE
-#define LUA_NUMBER double
-
-/*
-@@ LUAI_UACNUMBER is the result of an 'usual argument conversion'
-@* over a number.
-*/
-#define LUAI_UACNUMBER double
-
-
-/*
-@@ LUA_NUMBER_SCAN is the format for reading numbers.
-@@ LUA_NUMBER_FMT is the format for writing numbers.
-@@ lua_number2str converts a number to a string.
-@@ LUAI_MAXNUMBER2STR is maximum size of previous conversion.
-@@ lua_str2number converts a string to a number.
-*/
-#define LUA_NUMBER_SCAN "%lf"
-#define LUA_NUMBER_FMT "%.14g"
-#define lua_number2str(s,n) sprintf((s), LUA_NUMBER_FMT, (n))
-#define LUAI_MAXNUMBER2STR 32 /* 16 digits, sign, point, and \0 */
-#define lua_str2number(s,p) strtod((s), (p))
-
-
-/*
-@@ The luai_num* macros define the primitive operations over numbers.
-*/
-#if defined(LUA_CORE)
-#include <math.h>
-#define luai_numadd(a,b) ((a)+(b))
-#define luai_numsub(a,b) ((a)-(b))
-#define luai_nummul(a,b) ((a)*(b))
-#define luai_numdiv(a,b) ((a)/(b))
-#define luai_nummod(a,b) ((a) - floor((a)/(b))*(b))
-#define luai_numpow(a,b) (pow(a,b))
-#define luai_numunm(a) (-(a))
-#define luai_numeq(a,b) ((a)==(b))
-#define luai_numlt(a,b) ((a)<(b))
-#define luai_numle(a,b) ((a)<=(b))
-#define luai_numisnan(a) (!luai_numeq((a), (a)))
-#endif
-
-
-/*
-@@ lua_number2int is a macro to convert lua_Number to int.
-@@ lua_number2integer is a macro to convert lua_Number to lua_Integer.
-** CHANGE them if you know a faster way to convert a lua_Number to
-** int (with any rounding method and without throwing errors) in your
-** system. In Pentium machines, a naive typecast from double to int
-** in C is extremely slow, so any alternative is worth trying.
-*/
-
-/* On a Pentium, resort to a trick */
-#if defined(LUA_NUMBER_DOUBLE) && !defined(LUA_ANSI) && !defined(__SSE2__) && \
- (defined(__i386) || defined (_M_IX86) || defined(__i386__))
-
-/* On a Microsoft compiler, use assembler */
-#if defined(_MSC_VER)
-
-#define lua_number2int(i,d) __asm fld d __asm fistp i
-#define lua_number2integer(i,n) lua_number2int(i, n)
-
-/* the next trick should work on any Pentium, but sometimes clashes
- with a DirectX idiosyncrasy */
-#else
-
-union luai_Cast { double l_d; long l_l; };
-#define lua_number2int(i,d) \
- { volatile union luai_Cast u; u.l_d = (d) + 6755399441055744.0; (i) = u.l_l; }
-#define lua_number2integer(i,n) lua_number2int(i, n)
-
-#endif
-
-
-/* this option always works, but may be slow */
-#else
-#define lua_number2int(i,d) ((i)=(int)(d))
-#define lua_number2integer(i,d) ((i)=(lua_Integer)(d))
-
-#endif
-
-/* }================================================================== */
-
-
-/*
-@@ LUAI_USER_ALIGNMENT_T is a type that requires maximum alignment.
-** CHANGE it if your system requires alignments larger than double. (For
-** instance, if your system supports long doubles and they must be
-** aligned in 16-byte boundaries, then you should add long double in the
-** union.) Probably you do not need to change this.
-*/
-#define LUAI_USER_ALIGNMENT_T union { double u; void *s; long l; }
-
-
-/*
-@@ LUAI_THROW/LUAI_TRY define how Lua does exception handling.
-** CHANGE them if you prefer to use longjmp/setjmp even with C++
-** or if want/don't to use _longjmp/_setjmp instead of regular
-** longjmp/setjmp. By default, Lua handles errors with exceptions when
-** compiling as C++ code, with _longjmp/_setjmp when asked to use them,
-** and with longjmp/setjmp otherwise.
-*/
-#if defined(__cplusplus)
-/* C++ exceptions */
-#define LUAI_THROW(L,c) throw(c)
-#define LUAI_TRY(L,c,a) try { a } catch(...) \
- { if ((c)->status == 0) (c)->status = -1; }
-#define luai_jmpbuf int /* dummy variable */
-
-#elif defined(LUA_USE_ULONGJMP)
-/* in Unix, try _longjmp/_setjmp (more efficient) */
-#define LUAI_THROW(L,c) _longjmp((c)->b, 1)
-#define LUAI_TRY(L,c,a) if (_setjmp((c)->b) == 0) { a }
-#define luai_jmpbuf jmp_buf
-
-#else
-/* default handling with long jumps */
-#define LUAI_THROW(L,c) longjmp((c)->b, 1)
-#define LUAI_TRY(L,c,a) if (setjmp((c)->b) == 0) { a }
-#define luai_jmpbuf jmp_buf
-
-#endif
-
-
-/*
-@@ LUA_MAXCAPTURES is the maximum number of captures that a pattern
-@* can do during pattern-matching.
-** CHANGE it if you need more captures. This limit is arbitrary.
-*/
-#define LUA_MAXCAPTURES 32
-
-
-/*
-@@ lua_tmpnam is the function that the OS library uses to create a
-@* temporary name.
-@@ LUA_TMPNAMBUFSIZE is the maximum size of a name created by lua_tmpnam.
-** CHANGE them if you have an alternative to tmpnam (which is considered
-** insecure) or if you want the original tmpnam anyway. By default, Lua
-** uses tmpnam except when POSIX is available, where it uses mkstemp.
-*/
-#if defined(loslib_c) || defined(luaall_c)
-
-#if defined(LUA_USE_MKSTEMP)
-#include <unistd.h>
-#define LUA_TMPNAMBUFSIZE 32
-#define lua_tmpnam(b,e) { \
- strcpy(b, "/tmp/lua_XXXXXX"); \
- e = mkstemp(b); \
- if (e != -1) close(e); \
- e = (e == -1); }
-
-#else
-#define LUA_TMPNAMBUFSIZE L_tmpnam
-#define lua_tmpnam(b,e) { e = (tmpnam(b) == NULL); }
-#endif
-
-#endif
-
-
-/*
-@@ lua_popen spawns a new process connected to the current one through
-@* the file streams.
-** CHANGE it if you have a way to implement it in your system.
-*/
-#if defined(LUA_USE_POPEN)
-
-#define lua_popen(L,c,m) ((void)L, fflush(NULL), popen(c,m))
-#define lua_pclose(L,file) ((void)L, (pclose(file) != -1))
-
-#elif defined(LUA_WIN)
-
-#define lua_popen(L,c,m) ((void)L, _popen(c,m))
-#define lua_pclose(L,file) ((void)L, (_pclose(file) != -1))
-
-#else
-
-#define lua_popen(L,c,m) ((void)((void)c, m), \
- luaL_error(L, LUA_QL("popen") " not supported"), (FILE*)0)
-#define lua_pclose(L,file) ((void)((void)L, file), 0)
-
-#endif
-
-/*
-@@ LUA_DL_* define which dynamic-library system Lua should use.
-** CHANGE here if Lua has problems choosing the appropriate
-** dynamic-library system for your platform (either Windows' DLL, Mac's
-** dyld, or Unix's dlopen). If your system is some kind of Unix, there
-** is a good chance that it has dlopen, so LUA_DL_DLOPEN will work for
-** it. To use dlopen you also need to adapt the src/Makefile (probably
-** adding -ldl to the linker options), so Lua does not select it
-** automatically. (When you change the makefile to add -ldl, you must
-** also add -DLUA_USE_DLOPEN.)
-** If you do not want any kind of dynamic library, undefine all these
-** options.
-** By default, _WIN32 gets LUA_DL_DLL and MAC OS X gets LUA_DL_DYLD.
-*/
-#if defined(LUA_USE_DLOPEN)
-#define LUA_DL_DLOPEN
-#endif
-
-#if defined(LUA_WIN)
-#define LUA_DL_DLL
-#endif
-
-
-/*
-@@ LUAI_EXTRASPACE allows you to add user-specific data in a lua_State
-@* (the data goes just *before* the lua_State pointer).
-** CHANGE (define) this if you really need that. This value must be
-** a multiple of the maximum alignment required for your machine.
-*/
-#define LUAI_EXTRASPACE 0
-
-
-/*
-@@ luai_userstate* allow user-specific actions on threads.
-** CHANGE them if you defined LUAI_EXTRASPACE and need to do something
-** extra when a thread is created/deleted/resumed/yielded.
-*/
-#define luai_userstateopen(L) ((void)L)
-#define luai_userstateclose(L) ((void)L)
-#define luai_userstatethread(L,L1) ((void)L)
-#define luai_userstatefree(L) ((void)L)
-#define luai_userstateresume(L,n) ((void)L)
-#define luai_userstateyield(L,n) ((void)L)
-
-
-/*
-@@ LUA_INTFRMLEN is the length modifier for integer conversions
-@* in 'string.format'.
-@@ LUA_INTFRM_T is the integer type correspoding to the previous length
-@* modifier.
-** CHANGE them if your system supports long long or does not support long.
-*/
-
-#if defined(LUA_USELONGLONG)
-
-#define LUA_INTFRMLEN "ll"
-#define LUA_INTFRM_T long long
-
-#else
-
-#define LUA_INTFRMLEN "l"
-#define LUA_INTFRM_T long
-
-#endif
-
-
-
-/* =================================================================== */
-
-/*
-** Local configuration. You can use this space to add your redefinitions
-** without modifying the main part of the file.
-*/
-
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lualib.h,v 1.36.1.1 2007/12/27 13:02:25 roberto Exp $
-** Lua standard libraries
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lualib_h
-#define lualib_h
-
-#include "lua.h"
-
-
-/* Key to file-handle type */
-#define LUA_FILEHANDLE "FILE*"
-
-
-#define LUA_COLIBNAME "coroutine"
-LUALIB_API int (luaopen_base) (lua_State *L);
-
-#define LUA_TABLIBNAME "table"
-LUALIB_API int (luaopen_table) (lua_State *L);
-
-#define LUA_IOLIBNAME "io"
-LUALIB_API int (luaopen_io) (lua_State *L);
-
-#define LUA_OSLIBNAME "os"
-LUALIB_API int (luaopen_os) (lua_State *L);
-
-#define LUA_STRLIBNAME "string"
-LUALIB_API int (luaopen_string) (lua_State *L);
-
-#define LUA_MATHLIBNAME "math"
-LUALIB_API int (luaopen_math) (lua_State *L);
-
-#define LUA_DBLIBNAME "debug"
-LUALIB_API int (luaopen_debug) (lua_State *L);
-
-#define LUA_LOADLIBNAME "package"
-LUALIB_API int (luaopen_package) (lua_State *L);
-
-
-/* open all previous libraries */
-LUALIB_API void (luaL_openlibs) (lua_State *L);
-
-
-
-#ifndef lua_assert
-#define lua_assert(x) ((void)0)
-#endif
-
-
-#endif
+++ /dev/null
-/*
-** $Id: lundump.c,v 2.7.1.4 2008/04/04 19:51:41 roberto Exp $
-** load precompiled Lua chunks
-** See Copyright Notice in lua.h
-*/
-
-#include <string.h>
-
-#define lundump_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lmem.h"
-#include "lobject.h"
-#include "lstring.h"
-#include "lundump.h"
-#include "lzio.h"
-
-typedef struct {
- lua_State* L;
- ZIO* Z;
- Mbuffer* b;
- const char* name;
-} LoadState;
-
-#ifdef LUAC_TRUST_BINARIES
-#define IF(c,s)
-#define error(S,s)
-#else
-#define IF(c,s) if (c) error(S,s)
-
-static void error(LoadState* S, const char* why)
-{
- luaO_pushfstring(S->L,"%s: %s in precompiled chunk",S->name,why);
- luaD_throw(S->L,LUA_ERRSYNTAX);
-}
-#endif
-
-#define LoadMem(S,b,n,size) LoadBlock(S,b,(n)*(size))
-#define LoadByte(S) (lu_byte)LoadChar(S)
-#define LoadVar(S,x) LoadMem(S,&x,1,sizeof(x))
-#define LoadVector(S,b,n,size) LoadMem(S,b,n,size)
-
-static void LoadBlock(LoadState* S, void* b, size_t size)
-{
- size_t r=luaZ_read(S->Z,b,size);
- IF (r!=0, "unexpected end");
-}
-
-static int LoadChar(LoadState* S)
-{
- char x;
- LoadVar(S,x);
- return x;
-}
-
-static int LoadInt(LoadState* S)
-{
- int x;
- LoadVar(S,x);
- IF (x<0, "bad integer");
- return x;
-}
-
-static lua_Number LoadNumber(LoadState* S)
-{
- lua_Number x;
- LoadVar(S,x);
- return x;
-}
-
-static TString* LoadString(LoadState* S)
-{
- size_t size;
- LoadVar(S,size);
- if (size==0)
- return NULL;
- else
- {
- char* s=luaZ_openspace(S->L,S->b,size);
- LoadBlock(S,s,size);
- return luaS_newlstr(S->L,s,size-1); /* remove trailing '\0' */
- }
-}
-
-static void LoadCode(LoadState* S, Proto* f)
-{
- int n=LoadInt(S);
- f->code=luaM_newvector(S->L,n,Instruction);
- f->sizecode=n;
- LoadVector(S,f->code,n,sizeof(Instruction));
-}
-
-static Proto* LoadFunction(LoadState* S, TString* p);
-
-static void LoadConstants(LoadState* S, Proto* f)
-{
- int i,n;
- n=LoadInt(S);
- f->k=luaM_newvector(S->L,n,TValue);
- f->sizek=n;
- for (i=0; i<n; i++) setnilvalue(&f->k[i]);
- for (i=0; i<n; i++)
- {
- TValue* o=&f->k[i];
- int t=LoadChar(S);
- switch (t)
- {
- case LUA_TNIL:
- setnilvalue(o);
- break;
- case LUA_TBOOLEAN:
- setbvalue(o,LoadChar(S)!=0);
- break;
- case LUA_TNUMBER:
- setnvalue(o,LoadNumber(S));
- break;
- case LUA_TSTRING:
- setsvalue2n(S->L,o,LoadString(S));
- break;
- default:
- error(S,"bad constant");
- break;
- }
- }
- n=LoadInt(S);
- f->p=luaM_newvector(S->L,n,Proto*);
- f->sizep=n;
- for (i=0; i<n; i++) f->p[i]=NULL;
- for (i=0; i<n; i++) f->p[i]=LoadFunction(S,f->source);
-}
-
-static void LoadDebug(LoadState* S, Proto* f)
-{
- int i,n;
- n=LoadInt(S);
- f->lineinfo=luaM_newvector(S->L,n,int);
- f->sizelineinfo=n;
- LoadVector(S,f->lineinfo,n,sizeof(int));
- n=LoadInt(S);
- f->locvars=luaM_newvector(S->L,n,LocVar);
- f->sizelocvars=n;
- for (i=0; i<n; i++) f->locvars[i].varname=NULL;
- for (i=0; i<n; i++)
- {
- f->locvars[i].varname=LoadString(S);
- f->locvars[i].startpc=LoadInt(S);
- f->locvars[i].endpc=LoadInt(S);
- }
- n=LoadInt(S);
- f->upvalues=luaM_newvector(S->L,n,TString*);
- f->sizeupvalues=n;
- for (i=0; i<n; i++) f->upvalues[i]=NULL;
- for (i=0; i<n; i++) f->upvalues[i]=LoadString(S);
-}
-
-static Proto* LoadFunction(LoadState* S, TString* p)
-{
- Proto* f;
- if (++S->L->nCcalls > LUAI_MAXCCALLS) error(S,"code too deep");
- f=luaF_newproto(S->L);
- setptvalue2s(S->L,S->L->top,f); incr_top(S->L);
- f->source=LoadString(S); if (f->source==NULL) f->source=p;
- f->linedefined=LoadInt(S);
- f->lastlinedefined=LoadInt(S);
- f->nups=LoadByte(S);
- f->numparams=LoadByte(S);
- f->is_vararg=LoadByte(S);
- f->maxstacksize=LoadByte(S);
- LoadCode(S,f);
- LoadConstants(S,f);
- LoadDebug(S,f);
- IF (!luaG_checkcode(f), "bad code");
- S->L->top--;
- S->L->nCcalls--;
- return f;
-}
-
-static void LoadHeader(LoadState* S)
-{
- char h[LUAC_HEADERSIZE];
- char s[LUAC_HEADERSIZE];
- luaU_header(h);
- LoadBlock(S,s,LUAC_HEADERSIZE);
- IF (memcmp(h,s,LUAC_HEADERSIZE)!=0, "bad header");
-}
-
-/*
-** load precompiled chunk
-*/
-Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name)
-{
- LoadState S;
- if (*name=='@' || *name=='=')
- S.name=name+1;
- else if (*name==LUA_SIGNATURE[0])
- S.name="binary string";
- else
- S.name=name;
- S.L=L;
- S.Z=Z;
- S.b=buff;
- LoadHeader(&S);
- return LoadFunction(&S,luaS_newliteral(L,"=?"));
-}
-
-/*
-* make header
-*/
-void luaU_header (char* h)
-{
- int x=1;
- memcpy(h,LUA_SIGNATURE,sizeof(LUA_SIGNATURE)-1);
- h+=sizeof(LUA_SIGNATURE)-1;
- *h++=(char)LUAC_VERSION;
- *h++=(char)LUAC_FORMAT;
- *h++=(char)*(char*)&x; /* endianness */
- *h++=(char)sizeof(int);
- *h++=(char)sizeof(size_t);
- *h++=(char)sizeof(Instruction);
- *h++=(char)sizeof(lua_Number);
- *h++=(char)(((lua_Number)0.5)==0); /* is lua_Number integral? */
-}
+++ /dev/null
-/*
-** $Id: lundump.h,v 1.37.1.1 2007/12/27 13:02:25 roberto Exp $
-** load precompiled Lua chunks
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lundump_h
-#define lundump_h
-
-#include "lobject.h"
-#include "lzio.h"
-
-/* load one chunk; from lundump.c */
-LUAI_FUNC Proto* luaU_undump (lua_State* L, ZIO* Z, Mbuffer* buff, const char* name);
-
-/* make header; from lundump.c */
-LUAI_FUNC void luaU_header (char* h);
-
-/* dump one chunk; from ldump.c */
-LUAI_FUNC int luaU_dump (lua_State* L, const Proto* f, lua_Writer w, void* data, int strip);
-
-#ifdef luac_c
-/* print one chunk; from print.c */
-LUAI_FUNC void luaU_print (const Proto* f, int full);
-#endif
-
-/* for header of binary files -- this is Lua 5.1 */
-#define LUAC_VERSION 0x51
-
-/* for header of binary files -- this is the official format */
-#define LUAC_FORMAT 0
-
-/* size of header of binary files */
-#define LUAC_HEADERSIZE 12
-
-#endif
+++ /dev/null
-/*
-** $Id: lvm.c,v 2.63.1.3 2007/12/28 15:32:23 roberto Exp $
-** Lua virtual machine
-** See Copyright Notice in lua.h
-*/
-
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#define lvm_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "ldebug.h"
-#include "ldo.h"
-#include "lfunc.h"
-#include "lgc.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lstate.h"
-#include "lstring.h"
-#include "ltable.h"
-#include "ltm.h"
-#include "lvm.h"
-
-
-
-/* limit for table tag-method chains (to avoid loops) */
-#define MAXTAGLOOP 100
-
-
-const TValue *luaV_tonumber (const TValue *obj, TValue *n) {
- lua_Number num;
- if (ttisnumber(obj)) return obj;
- if (ttisstring(obj) && luaO_str2d(svalue(obj), &num)) {
- setnvalue(n, num);
- return n;
- }
- else
- return NULL;
-}
-
-
-int luaV_tostring (lua_State *L, StkId obj) {
- if (!ttisnumber(obj))
- return 0;
- else {
- char s[LUAI_MAXNUMBER2STR];
- lua_Number n = nvalue(obj);
- lua_number2str(s, n);
- setsvalue2s(L, obj, luaS_new(L, s));
- return 1;
- }
-}
-
-
-static void traceexec (lua_State *L, const Instruction *pc) {
- lu_byte mask = L->hookmask;
- const Instruction *oldpc = L->savedpc;
- L->savedpc = pc;
- if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
- resethookcount(L);
- luaD_callhook(L, LUA_HOOKCOUNT, -1);
- }
- if (mask & LUA_MASKLINE) {
- Proto *p = ci_func(L->ci)->l.p;
- int npc = pcRel(pc, p);
- int newline = getline(p, npc);
- /* call linehook when enter a new function, when jump back (loop),
- or when enter a new line */
- if (npc == 0 || pc <= oldpc || newline != getline(p, pcRel(oldpc, p)))
- luaD_callhook(L, LUA_HOOKLINE, newline);
- }
-}
-
-
-static void callTMres (lua_State *L, StkId res, const TValue *f,
- const TValue *p1, const TValue *p2) {
- ptrdiff_t result = savestack(L, res);
- setobj2s(L, L->top, f); /* push function */
- setobj2s(L, L->top+1, p1); /* 1st argument */
- setobj2s(L, L->top+2, p2); /* 2nd argument */
- luaD_checkstack(L, 3);
- L->top += 3;
- luaD_call(L, L->top - 3, 1);
- res = restorestack(L, result);
- L->top--;
- setobjs2s(L, res, L->top);
-}
-
-
-
-static void callTM (lua_State *L, const TValue *f, const TValue *p1,
- const TValue *p2, const TValue *p3) {
- setobj2s(L, L->top, f); /* push function */
- setobj2s(L, L->top+1, p1); /* 1st argument */
- setobj2s(L, L->top+2, p2); /* 2nd argument */
- setobj2s(L, L->top+3, p3); /* 3th argument */
- luaD_checkstack(L, 4);
- L->top += 4;
- luaD_call(L, L->top - 4, 0);
-}
-
-
-void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
- int loop;
- for (loop = 0; loop < MAXTAGLOOP; loop++) {
- const TValue *tm;
- if (ttistable(t)) { /* `t' is a table? */
- Table *h = hvalue(t);
- const TValue *res = luaH_get(h, key); /* do a primitive get */
- if (!ttisnil(res) || /* result is no nil? */
- (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
- setobj2s(L, val, res);
- return;
- }
- /* else will try the tag method */
- }
- else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
- luaG_typeerror(L, t, "index");
- if (ttisfunction(tm)) {
- callTMres(L, val, tm, t, key);
- return;
- }
- t = tm; /* else repeat with `tm' */
- }
- luaG_runerror(L, "loop in gettable");
-}
-
-
-void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
- int loop;
- for (loop = 0; loop < MAXTAGLOOP; loop++) {
- const TValue *tm;
- if (ttistable(t)) { /* `t' is a table? */
- Table *h = hvalue(t);
- TValue *oldval = luaH_set(L, h, key); /* do a primitive set */
- if (!ttisnil(oldval) || /* result is no nil? */
- (tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL) { /* or no TM? */
- setobj2t(L, oldval, val);
- luaC_barriert(L, h, val);
- return;
- }
- /* else will try the tag method */
- }
- else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
- luaG_typeerror(L, t, "index");
- if (ttisfunction(tm)) {
- callTM(L, tm, t, key, val);
- return;
- }
- t = tm; /* else repeat with `tm' */
- }
- luaG_runerror(L, "loop in settable");
-}
-
-
-static int call_binTM (lua_State *L, const TValue *p1, const TValue *p2,
- StkId res, TMS event) {
- const TValue *tm = luaT_gettmbyobj(L, p1, event); /* try first operand */
- if (ttisnil(tm))
- tm = luaT_gettmbyobj(L, p2, event); /* try second operand */
- if (ttisnil(tm)) return 0;
- callTMres(L, res, tm, p1, p2);
- return 1;
-}
-
-
-static const TValue *get_compTM (lua_State *L, Table *mt1, Table *mt2,
- TMS event) {
- const TValue *tm1 = fasttm(L, mt1, event);
- const TValue *tm2;
- if (tm1 == NULL) return NULL; /* no metamethod */
- if (mt1 == mt2) return tm1; /* same metatables => same metamethods */
- tm2 = fasttm(L, mt2, event);
- if (tm2 == NULL) return NULL; /* no metamethod */
- if (luaO_rawequalObj(tm1, tm2)) /* same metamethods? */
- return tm1;
- return NULL;
-}
-
-
-static int call_orderTM (lua_State *L, const TValue *p1, const TValue *p2,
- TMS event) {
- const TValue *tm1 = luaT_gettmbyobj(L, p1, event);
- const TValue *tm2;
- if (ttisnil(tm1)) return -1; /* no metamethod? */
- tm2 = luaT_gettmbyobj(L, p2, event);
- if (!luaO_rawequalObj(tm1, tm2)) /* different metamethods? */
- return -1;
- callTMres(L, L->top, tm1, p1, p2);
- return !l_isfalse(L->top);
-}
-
-
-static int l_strcmp (const TString *ls, const TString *rs) {
- const char *l = getstr(ls);
- size_t ll = ls->tsv.len;
- const char *r = getstr(rs);
- size_t lr = rs->tsv.len;
- for (;;) {
- int temp = strcoll(l, r);
- if (temp != 0) return temp;
- else { /* strings are equal up to a `\0' */
- size_t len = strlen(l); /* index of first `\0' in both strings */
- if (len == lr) /* r is finished? */
- return (len == ll) ? 0 : 1;
- else if (len == ll) /* l is finished? */
- return -1; /* l is smaller than r (because r is not finished) */
- /* both strings longer than `len'; go on comparing (after the `\0') */
- len++;
- l += len; ll -= len; r += len; lr -= len;
- }
- }
-}
-
-
-int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
- int res;
- if (ttype(l) != ttype(r))
- return luaG_ordererror(L, l, r);
- else if (ttisnumber(l))
- return luai_numlt(nvalue(l), nvalue(r));
- else if (ttisstring(l))
- return l_strcmp(rawtsvalue(l), rawtsvalue(r)) < 0;
- else if ((res = call_orderTM(L, l, r, TM_LT)) != -1)
- return res;
- return luaG_ordererror(L, l, r);
-}
-
-
-static int lessequal (lua_State *L, const TValue *l, const TValue *r) {
- int res;
- if (ttype(l) != ttype(r))
- return luaG_ordererror(L, l, r);
- else if (ttisnumber(l))
- return luai_numle(nvalue(l), nvalue(r));
- else if (ttisstring(l))
- return l_strcmp(rawtsvalue(l), rawtsvalue(r)) <= 0;
- else if ((res = call_orderTM(L, l, r, TM_LE)) != -1) /* first try `le' */
- return res;
- else if ((res = call_orderTM(L, r, l, TM_LT)) != -1) /* else try `lt' */
- return !res;
- return luaG_ordererror(L, l, r);
-}
-
-
-int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2) {
- const TValue *tm;
- lua_assert(ttype(t1) == ttype(t2));
- switch (ttype(t1)) {
- case LUA_TNIL: return 1;
- case LUA_TNUMBER: return luai_numeq(nvalue(t1), nvalue(t2));
- case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
- case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
- case LUA_TUSERDATA: {
- if (uvalue(t1) == uvalue(t2)) return 1;
- tm = get_compTM(L, uvalue(t1)->metatable, uvalue(t2)->metatable,
- TM_EQ);
- break; /* will try TM */
- }
- case LUA_TTABLE: {
- if (hvalue(t1) == hvalue(t2)) return 1;
- tm = get_compTM(L, hvalue(t1)->metatable, hvalue(t2)->metatable, TM_EQ);
- break; /* will try TM */
- }
- default: return gcvalue(t1) == gcvalue(t2);
- }
- if (tm == NULL) return 0; /* no TM? */
- callTMres(L, L->top, tm, t1, t2); /* call TM */
- return !l_isfalse(L->top);
-}
-
-
-void luaV_concat (lua_State *L, int total, int last) {
- do {
- StkId top = L->base + last + 1;
- int n = 2; /* number of elements handled in this pass (at least 2) */
- if (!(ttisstring(top-2) || ttisnumber(top-2)) || !tostring(L, top-1)) {
- if (!call_binTM(L, top-2, top-1, top-2, TM_CONCAT))
- luaG_concaterror(L, top-2, top-1);
- } else if (tsvalue(top-1)->len == 0) /* second op is empty? */
- (void)tostring(L, top - 2); /* result is first op (as string) */
- else {
- /* at least two string values; get as many as possible */
- size_t tl = tsvalue(top-1)->len;
- char *buffer;
- int i;
- /* collect total length */
- for (n = 1; n < total && tostring(L, top-n-1); n++) {
- size_t l = tsvalue(top-n-1)->len;
- if (l >= MAX_SIZET - tl) luaG_runerror(L, "string length overflow");
- tl += l;
- }
- buffer = luaZ_openspace(L, &G(L)->buff, tl);
- tl = 0;
- for (i=n; i>0; i--) { /* concat all strings */
- size_t l = tsvalue(top-i)->len;
- memcpy(buffer+tl, svalue(top-i), l);
- tl += l;
- }
- setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl));
- }
- total -= n-1; /* got `n' strings to create 1 new */
- last -= n-1;
- } while (total > 1); /* repeat until only 1 result left */
-}
-
-
-static void Arith (lua_State *L, StkId ra, const TValue *rb,
- const TValue *rc, TMS op) {
- TValue tempb, tempc;
- const TValue *b, *c;
- if ((b = luaV_tonumber(rb, &tempb)) != NULL &&
- (c = luaV_tonumber(rc, &tempc)) != NULL) {
- lua_Number nb = nvalue(b), nc = nvalue(c);
- switch (op) {
- case TM_ADD: setnvalue(ra, luai_numadd(nb, nc)); break;
- case TM_SUB: setnvalue(ra, luai_numsub(nb, nc)); break;
- case TM_MUL: setnvalue(ra, luai_nummul(nb, nc)); break;
- case TM_DIV: setnvalue(ra, luai_numdiv(nb, nc)); break;
- case TM_MOD: setnvalue(ra, luai_nummod(nb, nc)); break;
- case TM_POW: setnvalue(ra, luai_numpow(nb, nc)); break;
- case TM_UNM: setnvalue(ra, luai_numunm(nb)); break;
- default: lua_assert(0); break;
- }
- }
- else if (!call_binTM(L, rb, rc, ra, op))
- luaG_aritherror(L, rb, rc);
-}
-
-
-
-/*
-** some macros for common tasks in `luaV_execute'
-*/
-
-#define runtime_check(L, c) { if (!(c)) break; }
-
-#define RA(i) (base+GETARG_A(i))
-/* to be used after possible stack reallocation */
-#define RB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))
-#define RC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
-#define RKB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
- ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))
-#define RKC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
- ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))
-#define KBx(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, k+GETARG_Bx(i))
-
-
-#define dojump(L,pc,i) {(pc) += (i); luai_threadyield(L);}
-
-
-#define Protect(x) { L->savedpc = pc; {x;}; base = L->base; }
-
-
-#define arith_op(op,tm) { \
- TValue *rb = RKB(i); \
- TValue *rc = RKC(i); \
- if (ttisnumber(rb) && ttisnumber(rc)) { \
- lua_Number nb = nvalue(rb), nc = nvalue(rc); \
- setnvalue(ra, op(nb, nc)); \
- } \
- else \
- Protect(Arith(L, ra, rb, rc, tm)); \
- }
-
-
-
-void luaV_execute (lua_State *L, int nexeccalls) {
- LClosure *cl;
- StkId base;
- TValue *k;
- const Instruction *pc;
- reentry: /* entry point */
- lua_assert(isLua(L->ci));
- pc = L->savedpc;
- cl = &clvalue(L->ci->func)->l;
- base = L->base;
- k = cl->p->k;
- /* main loop of interpreter */
- for (;;) {
- const Instruction i = *pc++;
- StkId ra;
- if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
- (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
- traceexec(L, pc);
- if (L->status == LUA_YIELD) { /* did hook yield? */
- L->savedpc = pc - 1;
- return;
- }
- base = L->base;
- }
- /* warning!! several calls may realloc the stack and invalidate `ra' */
- ra = RA(i);
- lua_assert(base == L->base && L->base == L->ci->base);
- lua_assert(base <= L->top && L->top <= L->stack + L->stacksize);
- lua_assert(L->top == L->ci->top || luaG_checkopenop(i));
- switch (GET_OPCODE(i)) {
- case OP_MOVE: {
- setobjs2s(L, ra, RB(i));
- continue;
- }
- case OP_LOADK: {
- setobj2s(L, ra, KBx(i));
- continue;
- }
- case OP_LOADBOOL: {
- setbvalue(ra, GETARG_B(i));
- if (GETARG_C(i)) pc++; /* skip next instruction (if C) */
- continue;
- }
- case OP_LOADNIL: {
- TValue *rb = RB(i);
- do {
- setnilvalue(rb--);
- } while (rb >= ra);
- continue;
- }
- case OP_GETUPVAL: {
- int b = GETARG_B(i);
- setobj2s(L, ra, cl->upvals[b]->v);
- continue;
- }
- case OP_GETGLOBAL: {
- TValue g;
- TValue *rb = KBx(i);
- sethvalue(L, &g, cl->env);
- lua_assert(ttisstring(rb));
- Protect(luaV_gettable(L, &g, rb, ra));
- continue;
- }
- case OP_GETTABLE: {
- Protect(luaV_gettable(L, RB(i), RKC(i), ra));
- continue;
- }
- case OP_SETGLOBAL: {
- TValue g;
- sethvalue(L, &g, cl->env);
- lua_assert(ttisstring(KBx(i)));
- Protect(luaV_settable(L, &g, KBx(i), ra));
- continue;
- }
- case OP_SETUPVAL: {
- UpVal *uv = cl->upvals[GETARG_B(i)];
- setobj(L, uv->v, ra);
- luaC_barrier(L, uv, ra);
- continue;
- }
- case OP_SETTABLE: {
- Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
- continue;
- }
- case OP_NEWTABLE: {
- int b = GETARG_B(i);
- int c = GETARG_C(i);
- sethvalue(L, ra, luaH_new(L, luaO_fb2int(b), luaO_fb2int(c)));
- Protect(luaC_checkGC(L));
- continue;
- }
- case OP_SELF: {
- StkId rb = RB(i);
- setobjs2s(L, ra+1, rb);
- Protect(luaV_gettable(L, rb, RKC(i), ra));
- continue;
- }
- case OP_ADD: {
- arith_op(luai_numadd, TM_ADD);
- continue;
- }
- case OP_SUB: {
- arith_op(luai_numsub, TM_SUB);
- continue;
- }
- case OP_MUL: {
- arith_op(luai_nummul, TM_MUL);
- continue;
- }
- case OP_DIV: {
- arith_op(luai_numdiv, TM_DIV);
- continue;
- }
- case OP_MOD: {
- arith_op(luai_nummod, TM_MOD);
- continue;
- }
- case OP_POW: {
- arith_op(luai_numpow, TM_POW);
- continue;
- }
- case OP_UNM: {
- TValue *rb = RB(i);
- if (ttisnumber(rb)) {
- lua_Number nb = nvalue(rb);
- setnvalue(ra, luai_numunm(nb));
- }
- else {
- Protect(Arith(L, ra, rb, rb, TM_UNM));
- }
- continue;
- }
- case OP_NOT: {
- int res = l_isfalse(RB(i)); /* next assignment may change this value */
- setbvalue(ra, res);
- continue;
- }
- case OP_LEN: {
- const TValue *rb = RB(i);
- switch (ttype(rb)) {
- case LUA_TTABLE: {
- setnvalue(ra, cast_num(luaH_getn(hvalue(rb))));
- break;
- }
- case LUA_TSTRING: {
- setnvalue(ra, cast_num(tsvalue(rb)->len));
- break;
- }
- default: { /* try metamethod */
- Protect(
- if (!call_binTM(L, rb, luaO_nilobject, ra, TM_LEN))
- luaG_typeerror(L, rb, "get length of");
- )
- }
- }
- continue;
- }
- case OP_CONCAT: {
- int b = GETARG_B(i);
- int c = GETARG_C(i);
- Protect(luaV_concat(L, c-b+1, c); luaC_checkGC(L));
- setobjs2s(L, RA(i), base+b);
- continue;
- }
- case OP_JMP: {
- dojump(L, pc, GETARG_sBx(i));
- continue;
- }
- case OP_EQ: {
- TValue *rb = RKB(i);
- TValue *rc = RKC(i);
- Protect(
- if (equalobj(L, rb, rc) == GETARG_A(i))
- dojump(L, pc, GETARG_sBx(*pc));
- )
- pc++;
- continue;
- }
- case OP_LT: {
- Protect(
- if (luaV_lessthan(L, RKB(i), RKC(i)) == GETARG_A(i))
- dojump(L, pc, GETARG_sBx(*pc));
- )
- pc++;
- continue;
- }
- case OP_LE: {
- Protect(
- if (lessequal(L, RKB(i), RKC(i)) == GETARG_A(i))
- dojump(L, pc, GETARG_sBx(*pc));
- )
- pc++;
- continue;
- }
- case OP_TEST: {
- if (l_isfalse(ra) != GETARG_C(i))
- dojump(L, pc, GETARG_sBx(*pc));
- pc++;
- continue;
- }
- case OP_TESTSET: {
- TValue *rb = RB(i);
- if (l_isfalse(rb) != GETARG_C(i)) {
- setobjs2s(L, ra, rb);
- dojump(L, pc, GETARG_sBx(*pc));
- }
- pc++;
- continue;
- }
- case OP_CALL: {
- int b = GETARG_B(i);
- int nresults = GETARG_C(i) - 1;
- if (b != 0) L->top = ra+b; /* else previous instruction set top */
- L->savedpc = pc;
- switch (luaD_precall(L, ra, nresults)) {
- case PCRLUA: {
- nexeccalls++;
- goto reentry; /* restart luaV_execute over new Lua function */
- }
- case PCRC: {
- /* it was a C function (`precall' called it); adjust results */
- if (nresults >= 0) L->top = L->ci->top;
- base = L->base;
- continue;
- }
- default: {
- return; /* yield */
- }
- }
- }
- case OP_TAILCALL: {
- int b = GETARG_B(i);
- if (b != 0) L->top = ra+b; /* else previous instruction set top */
- L->savedpc = pc;
- lua_assert(GETARG_C(i) - 1 == LUA_MULTRET);
- switch (luaD_precall(L, ra, LUA_MULTRET)) {
- case PCRLUA: {
- /* tail call: put new frame in place of previous one */
- CallInfo *ci = L->ci - 1; /* previous frame */
- int aux;
- StkId func = ci->func;
- StkId pfunc = (ci+1)->func; /* previous function index */
- if (L->openupval) luaF_close(L, ci->base);
- L->base = ci->base = ci->func + ((ci+1)->base - pfunc);
- for (aux = 0; pfunc+aux < L->top; aux++) /* move frame down */
- setobjs2s(L, func+aux, pfunc+aux);
- ci->top = L->top = func+aux; /* correct top */
- lua_assert(L->top == L->base + clvalue(func)->l.p->maxstacksize);
- ci->savedpc = L->savedpc;
- ci->tailcalls++; /* one more call lost */
- L->ci--; /* remove new frame */
- goto reentry;
- }
- case PCRC: { /* it was a C function (`precall' called it) */
- base = L->base;
- continue;
- }
- default: {
- return; /* yield */
- }
- }
- }
- case OP_RETURN: {
- int b = GETARG_B(i);
- if (b != 0) L->top = ra+b-1;
- if (L->openupval) luaF_close(L, base);
- L->savedpc = pc;
- b = luaD_poscall(L, ra);
- if (--nexeccalls == 0) /* was previous function running `here'? */
- return; /* no: return */
- else { /* yes: continue its execution */
- if (b) L->top = L->ci->top;
- lua_assert(isLua(L->ci));
- lua_assert(GET_OPCODE(*((L->ci)->savedpc - 1)) == OP_CALL);
- goto reentry;
- }
- }
- case OP_FORLOOP: {
- lua_Number step = nvalue(ra+2);
- lua_Number idx = luai_numadd(nvalue(ra), step); /* increment index */
- lua_Number limit = nvalue(ra+1);
- if (luai_numlt(0, step) ? luai_numle(idx, limit)
- : luai_numle(limit, idx)) {
- dojump(L, pc, GETARG_sBx(i)); /* jump back */
- setnvalue(ra, idx); /* update internal index... */
- setnvalue(ra+3, idx); /* ...and external index */
- }
- continue;
- }
- case OP_FORPREP: {
- const TValue *init = ra;
- const TValue *plimit = ra+1;
- const TValue *pstep = ra+2;
- L->savedpc = pc; /* next steps may throw errors */
- if (!tonumber(init, ra))
- luaG_runerror(L, LUA_QL("for") " initial value must be a number");
- else if (!tonumber(plimit, ra+1))
- luaG_runerror(L, LUA_QL("for") " limit must be a number");
- else if (!tonumber(pstep, ra+2))
- luaG_runerror(L, LUA_QL("for") " step must be a number");
- setnvalue(ra, luai_numsub(nvalue(ra), nvalue(pstep)));
- dojump(L, pc, GETARG_sBx(i));
- continue;
- }
- case OP_TFORLOOP: {
- StkId cb = ra + 3; /* call base */
- setobjs2s(L, cb+2, ra+2);
- setobjs2s(L, cb+1, ra+1);
- setobjs2s(L, cb, ra);
- L->top = cb+3; /* func. + 2 args (state and index) */
- Protect(luaD_call(L, cb, GETARG_C(i)));
- L->top = L->ci->top;
- cb = RA(i) + 3; /* previous call may change the stack */
- if (!ttisnil(cb)) { /* continue loop? */
- setobjs2s(L, cb-1, cb); /* save control variable */
- dojump(L, pc, GETARG_sBx(*pc)); /* jump back */
- }
- pc++;
- continue;
- }
- case OP_SETLIST: {
- int n = GETARG_B(i);
- int c = GETARG_C(i);
- int last;
- Table *h;
- if (n == 0) {
- n = cast_int(L->top - ra) - 1;
- L->top = L->ci->top;
- }
- if (c == 0) c = cast_int(*pc++);
- runtime_check(L, ttistable(ra));
- h = hvalue(ra);
- last = ((c-1)*LFIELDS_PER_FLUSH) + n;
- if (last > h->sizearray) /* needs more space? */
- luaH_resizearray(L, h, last); /* pre-alloc it at once */
- for (; n > 0; n--) {
- TValue *val = ra+n;
- setobj2t(L, luaH_setnum(L, h, last--), val);
- luaC_barriert(L, h, val);
- }
- continue;
- }
- case OP_CLOSE: {
- luaF_close(L, ra);
- continue;
- }
- case OP_CLOSURE: {
- Proto *p;
- Closure *ncl;
- int nup, j;
- p = cl->p->p[GETARG_Bx(i)];
- nup = p->nups;
- ncl = luaF_newLclosure(L, nup, cl->env);
- ncl->l.p = p;
- for (j=0; j<nup; j++, pc++) {
- if (GET_OPCODE(*pc) == OP_GETUPVAL)
- ncl->l.upvals[j] = cl->upvals[GETARG_B(*pc)];
- else {
- lua_assert(GET_OPCODE(*pc) == OP_MOVE);
- ncl->l.upvals[j] = luaF_findupval(L, base + GETARG_B(*pc));
- }
- }
- setclvalue(L, ra, ncl);
- Protect(luaC_checkGC(L));
- continue;
- }
- case OP_VARARG: {
- int b = GETARG_B(i) - 1;
- int j;
- CallInfo *ci = L->ci;
- int n = cast_int(ci->base - ci->func) - cl->p->numparams - 1;
- if (b == LUA_MULTRET) {
- Protect(luaD_checkstack(L, n));
- ra = RA(i); /* previous call may change the stack */
- b = n;
- L->top = ra + n;
- }
- for (j = 0; j < b; j++) {
- if (j < n) {
- setobjs2s(L, ra + j, ci->base - n + j);
- }
- else {
- setnilvalue(ra + j);
- }
- }
- continue;
- }
- }
- }
-}
+++ /dev/null
-/*
-** $Id: lvm.h,v 2.5.1.1 2007/12/27 13:02:25 roberto Exp $
-** Lua virtual machine
-** See Copyright Notice in lua.h
-*/
-
-#ifndef lvm_h
-#define lvm_h
-
-
-#include "ldo.h"
-#include "lobject.h"
-#include "ltm.h"
-
-
-#define tostring(L,o) ((ttype(o) == LUA_TSTRING) || (luaV_tostring(L, o)))
-
-#define tonumber(o,n) (ttype(o) == LUA_TNUMBER || \
- (((o) = luaV_tonumber(o,n)) != NULL))
-
-#define equalobj(L,o1,o2) \
- (ttype(o1) == ttype(o2) && luaV_equalval(L, o1, o2))
-
-
-LUAI_FUNC int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r);
-LUAI_FUNC int luaV_equalval (lua_State *L, const TValue *t1, const TValue *t2);
-LUAI_FUNC const TValue *luaV_tonumber (const TValue *obj, TValue *n);
-LUAI_FUNC int luaV_tostring (lua_State *L, StkId obj);
-LUAI_FUNC void luaV_gettable (lua_State *L, const TValue *t, TValue *key,
- StkId val);
-LUAI_FUNC void luaV_settable (lua_State *L, const TValue *t, TValue *key,
- StkId val);
-LUAI_FUNC void luaV_execute (lua_State *L, int nexeccalls);
-LUAI_FUNC void luaV_concat (lua_State *L, int total, int last);
-
-#endif
+++ /dev/null
-/*
-** $Id: lzio.c,v 1.31.1.1 2007/12/27 13:02:25 roberto Exp $
-** a generic input stream interface
-** See Copyright Notice in lua.h
-*/
-
-
-#include <string.h>
-
-#define lzio_c
-#define LUA_CORE
-
-#include "lua.h"
-
-#include "llimits.h"
-#include "lmem.h"
-#include "lstate.h"
-#include "lzio.h"
-
-
-int luaZ_fill (ZIO *z) {
- size_t size;
- lua_State *L = z->L;
- const char *buff;
- lua_unlock(L);
- buff = z->reader(L, z->data, &size);
- lua_lock(L);
- if (buff == NULL || size == 0) return EOZ;
- z->n = size - 1;
- z->p = buff;
- return char2int(*(z->p++));
-}
-
-
-int luaZ_lookahead (ZIO *z) {
- if (z->n == 0) {
- if (luaZ_fill(z) == EOZ)
- return EOZ;
- else {
- z->n++; /* luaZ_fill removed first byte; put back it */
- z->p--;
- }
- }
- return char2int(*z->p);
-}
-
-
-void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader, void *data) {
- z->L = L;
- z->reader = reader;
- z->data = data;
- z->n = 0;
- z->p = NULL;
-}
-
-
-/* --------------------------------------------------------------- read --- */
-size_t luaZ_read (ZIO *z, void *b, size_t n) {
- while (n) {
- size_t m;
- if (luaZ_lookahead(z) == EOZ)
- return n; /* return number of missing bytes */
- m = (n <= z->n) ? n : z->n; /* min. between n and z->n */
- memcpy(b, z->p, m);
- z->n -= m;
- z->p += m;
- b = (char *)b + m;
- n -= m;
- }
- return 0;
-}
-
-/* ------------------------------------------------------------------------ */
-char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n) {
- if (n > buff->buffsize) {
- if (n < LUA_MINBUFFER) n = LUA_MINBUFFER;
- luaZ_resizebuffer(L, buff, n);
- }
- return buff->buffer;
-}
+++ /dev/null
-/*
-** $Id: lzio.h,v 1.21.1.1 2007/12/27 13:02:25 roberto Exp $
-** Buffered streams
-** See Copyright Notice in lua.h
-*/
-
-
-#ifndef lzio_h
-#define lzio_h
-
-#include "lua.h"
-
-#include "lmem.h"
-
-
-#define EOZ (-1) /* end of stream */
-
-typedef struct Zio ZIO;
-
-#define char2int(c) cast(int, cast(unsigned char, (c)))
-
-#define zgetc(z) (((z)->n--)>0 ? char2int(*(z)->p++) : luaZ_fill(z))
-
-typedef struct Mbuffer {
- char *buffer;
- size_t n;
- size_t buffsize;
-} Mbuffer;
-
-#define luaZ_initbuffer(L, buff) ((buff)->buffer = NULL, (buff)->buffsize = 0)
-
-#define luaZ_buffer(buff) ((buff)->buffer)
-#define luaZ_sizebuffer(buff) ((buff)->buffsize)
-#define luaZ_bufflen(buff) ((buff)->n)
-
-#define luaZ_resetbuffer(buff) ((buff)->n = 0)
-
-
-#define luaZ_resizebuffer(L, buff, size) \
- (luaM_reallocvector(L, (buff)->buffer, (buff)->buffsize, size, char), \
- (buff)->buffsize = size)
-
-#define luaZ_freebuffer(L, buff) luaZ_resizebuffer(L, buff, 0)
-
-
-LUAI_FUNC char *luaZ_openspace (lua_State *L, Mbuffer *buff, size_t n);
-LUAI_FUNC void luaZ_init (lua_State *L, ZIO *z, lua_Reader reader,
- void *data);
-LUAI_FUNC size_t luaZ_read (ZIO* z, void* b, size_t n); /* read next n bytes */
-LUAI_FUNC int luaZ_lookahead (ZIO *z);
-
-
-
-/* --------- Private Part ------------------ */
-
-struct Zio {
- size_t n; /* bytes still unread */
- const char *p; /* current position in buffer */
- lua_Reader reader;
- void* data; /* additional data */
- lua_State *L; /* Lua state (for reader) */
-};
-
-
-LUAI_FUNC int luaZ_fill (ZIO *z);
-
-#endif
+++ /dev/null
-/*
-** $Id: print.c,v 1.55a 2006/05/31 13:30:05 lhf Exp $
-** print bytecodes
-** See Copyright Notice in lua.h
-*/
-
-#include <ctype.h>
-#include <stdio.h>
-
-#define luac_c
-#define LUA_CORE
-
-#include "ldebug.h"
-#include "lobject.h"
-#include "lopcodes.h"
-#include "lundump.h"
-
-#define PrintFunction luaU_print
-
-#define Sizeof(x) ((int)sizeof(x))
-#define VOID(p) ((const void*)(p))
-
-static void PrintString(const TString* ts)
-{
- const char* s=getstr(ts);
- size_t i,n=ts->tsv.len;
- putchar('"');
- for (i=0; i<n; i++)
- {
- int c=s[i];
- switch (c)
- {
- case '"': printf("\\\""); break;
- case '\\': printf("\\\\"); break;
- case '\a': printf("\\a"); break;
- case '\b': printf("\\b"); break;
- case '\f': printf("\\f"); break;
- case '\n': printf("\\n"); break;
- case '\r': printf("\\r"); break;
- case '\t': printf("\\t"); break;
- case '\v': printf("\\v"); break;
- default: if (isprint((unsigned char)c))
- putchar(c);
- else
- printf("\\%03u",(unsigned char)c);
- }
- }
- putchar('"');
-}
-
-static void PrintConstant(const Proto* f, int i)
-{
- const TValue* o=&f->k[i];
- switch (ttype(o))
- {
- case LUA_TNIL:
- printf("nil");
- break;
- case LUA_TBOOLEAN:
- printf(bvalue(o) ? "true" : "false");
- break;
- case LUA_TNUMBER:
- printf(LUA_NUMBER_FMT,nvalue(o));
- break;
- case LUA_TSTRING:
- PrintString(rawtsvalue(o));
- break;
- default: /* cannot happen */
- printf("? type=%d",ttype(o));
- break;
- }
-}
-
-static void PrintCode(const Proto* f)
-{
- const Instruction* code=f->code;
- int pc,n=f->sizecode;
- for (pc=0; pc<n; pc++)
- {
- Instruction i=code[pc];
- OpCode o=GET_OPCODE(i);
- int a=GETARG_A(i);
- int b=GETARG_B(i);
- int c=GETARG_C(i);
- int bx=GETARG_Bx(i);
- int sbx=GETARG_sBx(i);
- int line=getline(f,pc);
- printf("\t%d\t",pc+1);
- if (line>0) printf("[%d]\t",line); else printf("[-]\t");
- printf("%-9s\t",luaP_opnames[o]);
- switch (getOpMode(o))
- {
- case iABC:
- printf("%d",a);
- if (getBMode(o)!=OpArgN) printf(" %d",ISK(b) ? (-1-INDEXK(b)) : b);
- if (getCMode(o)!=OpArgN) printf(" %d",ISK(c) ? (-1-INDEXK(c)) : c);
- break;
- case iABx:
- if (getBMode(o)==OpArgK) printf("%d %d",a,-1-bx); else printf("%d %d",a,bx);
- break;
- case iAsBx:
- if (o==OP_JMP) printf("%d",sbx); else printf("%d %d",a,sbx);
- break;
- }
- switch (o)
- {
- case OP_LOADK:
- printf("\t; "); PrintConstant(f,bx);
- break;
- case OP_GETUPVAL:
- case OP_SETUPVAL:
- printf("\t; %s", (f->sizeupvalues>0) ? getstr(f->upvalues[b]) : "-");
- break;
- case OP_GETGLOBAL:
- case OP_SETGLOBAL:
- printf("\t; %s",svalue(&f->k[bx]));
- break;
- case OP_GETTABLE:
- case OP_SELF:
- if (ISK(c)) { printf("\t; "); PrintConstant(f,INDEXK(c)); }
- break;
- case OP_SETTABLE:
- case OP_ADD:
- case OP_SUB:
- case OP_MUL:
- case OP_DIV:
- case OP_POW:
- case OP_EQ:
- case OP_LT:
- case OP_LE:
- if (ISK(b) || ISK(c))
- {
- printf("\t; ");
- if (ISK(b)) PrintConstant(f,INDEXK(b)); else printf("-");
- printf(" ");
- if (ISK(c)) PrintConstant(f,INDEXK(c)); else printf("-");
- }
- break;
- case OP_JMP:
- case OP_FORLOOP:
- case OP_FORPREP:
- printf("\t; to %d",sbx+pc+2);
- break;
- case OP_CLOSURE:
- printf("\t; %p",VOID(f->p[bx]));
- break;
- case OP_SETLIST:
- if (c==0) printf("\t; %d",(int)code[++pc]);
- else printf("\t; %d",c);
- break;
- default:
- break;
- }
- printf("\n");
- }
-}
-
-#define SS(x) (x==1)?"":"s"
-#define S(x) x,SS(x)
-
-static void PrintHeader(const Proto* f)
-{
- const char* s=getstr(f->source);
- if (*s=='@' || *s=='=')
- s++;
- else if (*s==LUA_SIGNATURE[0])
- s="(bstring)";
- else
- s="(string)";
- printf("\n%s <%s:%d,%d> (%d instruction%s, %d bytes at %p)\n",
- (f->linedefined==0)?"main":"function",s,
- f->linedefined,f->lastlinedefined,
- S(f->sizecode),f->sizecode*Sizeof(Instruction),VOID(f));
- printf("%d%s param%s, %d slot%s, %d upvalue%s, ",
- f->numparams,f->is_vararg?"+":"",SS(f->numparams),
- S(f->maxstacksize),S(f->nups));
- printf("%d local%s, %d constant%s, %d function%s\n",
- S(f->sizelocvars),S(f->sizek),S(f->sizep));
-}
-
-static void PrintConstants(const Proto* f)
-{
- int i,n=f->sizek;
- printf("constants (%d) for %p:\n",n,VOID(f));
- for (i=0; i<n; i++)
- {
- printf("\t%d\t",i+1);
- PrintConstant(f,i);
- printf("\n");
- }
-}
-
-static void PrintLocals(const Proto* f)
-{
- int i,n=f->sizelocvars;
- printf("locals (%d) for %p:\n",n,VOID(f));
- for (i=0; i<n; i++)
- {
- printf("\t%d\t%s\t%d\t%d\n",
- i,getstr(f->locvars[i].varname),f->locvars[i].startpc+1,f->locvars[i].endpc+1);
- }
-}
-
-static void PrintUpvalues(const Proto* f)
-{
- int i,n=f->sizeupvalues;
- printf("upvalues (%d) for %p:\n",n,VOID(f));
- if (f->upvalues==NULL) return;
- for (i=0; i<n; i++)
- {
- printf("\t%d\t%s\n",i,getstr(f->upvalues[i]));
- }
-}
-
-void PrintFunction(const Proto* f, int full)
-{
- int i,n=f->sizep;
- PrintHeader(f);
- PrintCode(f);
- if (full)
- {
- PrintConstants(f);
- PrintLocals(f);
- PrintUpvalues(f);
- }
- for (i=0; i<n; i++) PrintFunction(f->p[i],full);
-}
+++ /dev/null
-These are simple tests for Lua. Some of them contain useful code.
-They are meant to be run to make sure Lua is built correctly and also
-to be read, to see how Lua programs look.
-
-Here is a one-line summary of each program:
-
- bisect.lua bisection method for solving non-linear equations
- cf.lua temperature conversion table (celsius to farenheit)
- echo.lua echo command line arguments
- env.lua environment variables as automatic global variables
- factorial.lua factorial without recursion
- fib.lua fibonacci function with cache
- fibfor.lua fibonacci numbers with coroutines and generators
- globals.lua report global variable usage
- hello.lua the first program in every language
- life.lua Conway's Game of Life
- luac.lua bare-bones luac
- printf.lua an implementation of printf
- readonly.lua make global variables readonly
- sieve.lua the sieve of of Eratosthenes programmed with coroutines
- sort.lua two implementations of a sort function
- table.lua make table, grouping all data for the same item
- trace-calls.lua trace calls
- trace-globals.lua trace assigments to global variables
- xd.lua hex dump
+++ /dev/null
--- bisection method for solving non-linear equations
-
-delta=1e-6 -- tolerance
-
-function bisect(f,a,b,fa,fb)
- local c=(a+b)/2
- io.write(n," c=",c," a=",a," b=",b,"\n")
- if c==a or c==b or math.abs(a-b)<delta then return c,b-a end
- n=n+1
- local fc=f(c)
- if fa*fc<0 then return bisect(f,a,c,fa,fc) else return bisect(f,c,b,fc,fb) end
-end
-
--- find root of f in the inverval [a,b]. needs f(a)*f(b)<0
-function solve(f,a,b)
- n=0
- local z,e=bisect(f,a,b,f(a),f(b))
- io.write(string.format("after %d steps, root is %.17g with error %.1e, f=%.1e\n",n,z,e,f(z)))
-end
-
--- our function
-function f(x)
- return x*x*x-x-1
-end
-
--- find zero in [1,2]
-solve(f,1,2)
+++ /dev/null
--- temperature conversion table (celsius to farenheit)
-
-for c0=-20,50-1,10 do
- io.write("C ")
- for c=c0,c0+10-1 do
- io.write(string.format("%3.0f ",c))
- end
- io.write("\n")
-
- io.write("F ")
- for c=c0,c0+10-1 do
- f=(9/5)*c+32
- io.write(string.format("%3.0f ",f))
- end
- io.write("\n\n")
-end
+++ /dev/null
--- echo command line arguments
-
-for i=0,table.getn(arg) do
- print(i,arg[i])
-end
+++ /dev/null
--- read environment variables as if they were global variables
-
-local f=function (t,i) return os.getenv(i) end
-setmetatable(getfenv(),{__index=f})
-
--- an example
-print(a,USER,PATH)
+++ /dev/null
--- function closures are powerful
-
--- traditional fixed-point operator from functional programming
-Y = function (g)
- local a = function (f) return f(f) end
- return a(function (f)
- return g(function (x)
- local c=f(f)
- return c(x)
- end)
- end)
-end
-
-
--- factorial without recursion
-F = function (f)
- return function (n)
- if n == 0 then return 1
- else return n*f(n-1) end
- end
- end
-
-factorial = Y(F) -- factorial is the fixed point of F
-
--- now test it
-function test(x)
- io.write(x,"! = ",factorial(x),"\n")
-end
-
-for n=0,16 do
- test(n)
-end
+++ /dev/null
--- fibonacci function with cache
-
--- very inefficient fibonacci function
-function fib(n)
- N=N+1
- if n<2 then
- return n
- else
- return fib(n-1)+fib(n-2)
- end
-end
-
--- a general-purpose value cache
-function cache(f)
- local c={}
- return function (x)
- local y=c[x]
- if not y then
- y=f(x)
- c[x]=y
- end
- return y
- end
-end
-
--- run and time it
-function test(s,f)
- N=0
- local c=os.clock()
- local v=f(n)
- local t=os.clock()-c
- print(s,n,v,t,N)
-end
-
-n=arg[1] or 24 -- for other values, do lua fib.lua XX
-n=tonumber(n)
-print("","n","value","time","evals")
-test("plain",fib)
-fib=cache(fib)
-test("cached",fib)
+++ /dev/null
--- example of for with generator functions
-
-function generatefib (n)
- return coroutine.wrap(function ()
- local a,b = 1, 1
- while a <= n do
- coroutine.yield(a)
- a, b = b, a+b
- end
- end)
-end
-
-for i in generatefib(1000) do print(i) end
+++ /dev/null
--- reads luac listings and reports global variable usage
--- lines where a global is written to are marked with "*"
--- typical usage: luac -p -l file.lua | lua globals.lua | sort | lua table.lua
-
-while 1 do
- local s=io.read()
- if s==nil then break end
- local ok,_,l,op,g=string.find(s,"%[%-?(%d*)%]%s*([GS])ETGLOBAL.-;%s+(.*)$")
- if ok then
- if op=="S" then op="*" else op="" end
- io.write(g,"\t",l,op,"\n")
- end
-end
+++ /dev/null
--- the first program in every language
-
-io.write("Hello world, from ",_VERSION,"!\n")
+++ /dev/null
--- life.lua
--- original by Dave Bollinger <DBollinger@compuserve.com> posted to lua-l
--- modified to use ANSI terminal escape sequences
--- modified to use for instead of while
-
-local write=io.write
-
-ALIVE="¥" DEAD="þ"
-ALIVE="O" DEAD="-"
-
-function delay() -- NOTE: SYSTEM-DEPENDENT, adjust as necessary
- for i=1,10000 do end
- -- local i=os.clock()+1 while(os.clock()<i) do end
-end
-
-function ARRAY2D(w,h)
- local t = {w=w,h=h}
- for y=1,h do
- t[y] = {}
- for x=1,w do
- t[y][x]=0
- end
- end
- return t
-end
-
-_CELLS = {}
-
--- give birth to a "shape" within the cell array
-function _CELLS:spawn(shape,left,top)
- for y=0,shape.h-1 do
- for x=0,shape.w-1 do
- self[top+y][left+x] = shape[y*shape.w+x+1]
- end
- end
-end
-
--- run the CA and produce the next generation
-function _CELLS:evolve(next)
- local ym1,y,yp1,yi=self.h-1,self.h,1,self.h
- while yi > 0 do
- local xm1,x,xp1,xi=self.w-1,self.w,1,self.w
- while xi > 0 do
- local sum = self[ym1][xm1] + self[ym1][x] + self[ym1][xp1] +
- self[y][xm1] + self[y][xp1] +
- self[yp1][xm1] + self[yp1][x] + self[yp1][xp1]
- next[y][x] = ((sum==2) and self[y][x]) or ((sum==3) and 1) or 0
- xm1,x,xp1,xi = x,xp1,xp1+1,xi-1
- end
- ym1,y,yp1,yi = y,yp1,yp1+1,yi-1
- end
-end
-
--- output the array to screen
-function _CELLS:draw()
- local out="" -- accumulate to reduce flicker
- for y=1,self.h do
- for x=1,self.w do
- out=out..(((self[y][x]>0) and ALIVE) or DEAD)
- end
- out=out.."\n"
- end
- write(out)
-end
-
--- constructor
-function CELLS(w,h)
- local c = ARRAY2D(w,h)
- c.spawn = _CELLS.spawn
- c.evolve = _CELLS.evolve
- c.draw = _CELLS.draw
- return c
-end
-
---
--- shapes suitable for use with spawn() above
---
-HEART = { 1,0,1,1,0,1,1,1,1; w=3,h=3 }
-GLIDER = { 0,0,1,1,0,1,0,1,1; w=3,h=3 }
-EXPLODE = { 0,1,0,1,1,1,1,0,1,0,1,0; w=3,h=4 }
-FISH = { 0,1,1,1,1,1,0,0,0,1,0,0,0,0,1,1,0,0,1,0; w=5,h=4 }
-BUTTERFLY = { 1,0,0,0,1,0,1,1,1,0,1,0,0,0,1,1,0,1,0,1,1,0,0,0,1; w=5,h=5 }
-
--- the main routine
-function LIFE(w,h)
- -- create two arrays
- local thisgen = CELLS(w,h)
- local nextgen = CELLS(w,h)
-
- -- create some life
- -- about 1000 generations of fun, then a glider steady-state
- thisgen:spawn(GLIDER,5,4)
- thisgen:spawn(EXPLODE,25,10)
- thisgen:spawn(FISH,4,12)
-
- -- run until break
- local gen=1
- write("\027[2J") -- ANSI clear screen
- while 1 do
- thisgen:evolve(nextgen)
- thisgen,nextgen = nextgen,thisgen
- write("\027[H") -- ANSI home cursor
- thisgen:draw()
- write("Life - generation ",gen,"\n")
- gen=gen+1
- if gen>2000 then break end
- --delay() -- no delay
- end
-end
-
-LIFE(40,20)
+++ /dev/null
--- bare-bones luac in Lua
--- usage: lua luac.lua file.lua
-
-assert(arg[1]~=nil and arg[2]==nil,"usage: lua luac.lua file.lua")
-f=assert(io.open("luac.out","wb"))
-assert(f:write(string.dump(assert(loadfile(arg[1])))))
-assert(f:close())
+++ /dev/null
--- an implementation of printf
-
-function printf(...)
- io.write(string.format(...))
-end
-
-printf("Hello %s from %s on %s\n",os.getenv"USER" or "there",_VERSION,os.date())
+++ /dev/null
--- make global variables readonly
-
-local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end
-local g={}
-local G=getfenv()
-setmetatable(g,{__index=G,__newindex=f})
-setfenv(1,g)
-
--- an example
-rawset(g,"x",3)
-x=2
-y=1 -- cannot redefine `y'
+++ /dev/null
--- the sieve of of Eratosthenes programmed with coroutines
--- typical usage: lua -e N=1000 sieve.lua | column
-
--- generate all the numbers from 2 to n
-function gen (n)
- return coroutine.wrap(function ()
- for i=2,n do coroutine.yield(i) end
- end)
-end
-
--- filter the numbers generated by `g', removing multiples of `p'
-function filter (p, g)
- return coroutine.wrap(function ()
- while 1 do
- local n = g()
- if n == nil then return end
- if math.mod(n, p) ~= 0 then coroutine.yield(n) end
- end
- end)
-end
-
-N=N or 1000 -- from command line
-x = gen(N) -- generate primes up to N
-while 1 do
- local n = x() -- pick a number until done
- if n == nil then break end
- print(n) -- must be a prime number
- x = filter(n, x) -- now remove its multiples
-end
+++ /dev/null
--- two implementations of a sort function
--- this is an example only. Lua has now a built-in function "sort"
-
--- extracted from Programming Pearls, page 110
-function qsort(x,l,u,f)
- if l<u then
- local m=math.random(u-(l-1))+l-1 -- choose a random pivot in range l..u
- x[l],x[m]=x[m],x[l] -- swap pivot to first position
- local t=x[l] -- pivot value
- m=l
- local i=l+1
- while i<=u do
- -- invariant: x[l+1..m] < t <= x[m+1..i-1]
- if f(x[i],t) then
- m=m+1
- x[m],x[i]=x[i],x[m] -- swap x[i] and x[m]
- end
- i=i+1
- end
- x[l],x[m]=x[m],x[l] -- swap pivot to a valid place
- -- x[l+1..m-1] < x[m] <= x[m+1..u]
- qsort(x,l,m-1,f)
- qsort(x,m+1,u,f)
- end
-end
-
-function selectionsort(x,n,f)
- local i=1
- while i<=n do
- local m,j=i,i+1
- while j<=n do
- if f(x[j],x[m]) then m=j end
- j=j+1
- end
- x[i],x[m]=x[m],x[i] -- swap x[i] and x[m]
- i=i+1
- end
-end
-
-function show(m,x)
- io.write(m,"\n\t")
- local i=1
- while x[i] do
- io.write(x[i])
- i=i+1
- if x[i] then io.write(",") end
- end
- io.write("\n")
-end
-
-function testsorts(x)
- local n=1
- while x[n] do n=n+1 end; n=n-1 -- count elements
- show("original",x)
- qsort(x,1,n,function (x,y) return x<y end)
- show("after quicksort",x)
- selectionsort(x,n,function (x,y) return x>y end)
- show("after reverse selection sort",x)
- qsort(x,1,n,function (x,y) return x<y end)
- show("after quicksort again",x)
-end
-
--- array to be sorted
-x={"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"}
-
-testsorts(x)
+++ /dev/null
--- make table, grouping all data for the same item
--- input is 2 columns (item, data)
-
-local A
-while 1 do
- local l=io.read()
- if l==nil then break end
- local _,_,a,b=string.find(l,'"?([_%w]+)"?%s*(.*)$')
- if a~=A then A=a io.write("\n",a,":") end
- io.write(" ",b)
-end
-io.write("\n")
+++ /dev/null
--- trace calls
--- example: lua -ltrace-calls bisect.lua
-
-local level=0
-
-local function hook(event)
- local t=debug.getinfo(3)
- io.write(level," >>> ",string.rep(" ",level))
- if t~=nil and t.currentline>=0 then io.write(t.short_src,":",t.currentline," ") end
- t=debug.getinfo(2)
- if event=="call" then
- level=level+1
- else
- level=level-1 if level<0 then level=0 end
- end
- if t.what=="main" then
- if event=="call" then
- io.write("begin ",t.short_src)
- else
- io.write("end ",t.short_src)
- end
- elseif t.what=="Lua" then
--- table.foreach(t,print)
- io.write(event," ",t.name or "(Lua)"," <",t.linedefined,":",t.short_src,">")
- else
- io.write(event," ",t.name or "(C)"," [",t.what,"] ")
- end
- io.write("\n")
-end
-
-debug.sethook(hook,"cr")
-level=0
+++ /dev/null
--- trace assigments to global variables
-
-do
- -- a tostring that quotes strings. note the use of the original tostring.
- local _tostring=tostring
- local tostring=function(a)
- if type(a)=="string" then
- return string.format("%q",a)
- else
- return _tostring(a)
- end
- end
-
- local log=function (name,old,new)
- local t=debug.getinfo(3,"Sl")
- local line=t.currentline
- io.write(t.short_src)
- if line>=0 then io.write(":",line) end
- io.write(": ",name," is now ",tostring(new)," (was ",tostring(old),")","\n")
- end
-
- local g={}
- local set=function (t,name,value)
- log(name,g[name],value)
- g[name]=value
- end
- setmetatable(getfenv(),{__index=g,__newindex=set})
-end
-
--- an example
-
-a=1
-b=2
-a=10
-b=20
-b=nil
-b=200
-print(a,b,c)
+++ /dev/null
--- hex dump
--- usage: lua xd.lua < file
-
-local offset=0
-while true do
- local s=io.read(16)
- if s==nil then return end
- io.write(string.format("%08X ",offset))
- string.gsub(s,"(.)",
- function (c) io.write(string.format("%02X ",string.byte(c))) end)
- io.write(string.rep(" ",3*(16-string.len(s))))
- io.write(" ",string.gsub(s,"%c","."),"\n")
- offset=offset+16
-end
N_(" Use 'net help registry' to get more information about "
"'net registry' commands.")
},
- { "lua",
- net_lua,
- NET_TRANSPORT_LOCAL,
- N_("Open a lua interpreter"),
- N_(" Use 'net help lua' to get more information about 'net "
- "lua' commands.")
- },
{ "eventlog",
net_eventlog,
NET_TRANSPORT_LOCAL,
+++ /dev/null
-/*
- * Unix SMB/CIFS implementation.
- * Lua experiments
- * Copyright (C) Volker Lendecke 2006
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
- */
-
-
-#include "includes.h"
-#include "utils/net.h"
-
-#include "lua-5.1.4/src/lualib.h"
-#include "lua-5.1.4/src/lauxlib.h"
-
-#define SOCK_METATABLE "cade1208-9029-4d76-8748-426dfc1436f7"
-
-struct sock_userdata {
- int fd;
-};
-
-static int sock_userdata_gc(lua_State *L)
-{
- struct sock_userdata *p = (struct sock_userdata *)
- luaL_checkudata(L, 1, SOCK_METATABLE);
- close(p->fd);
- return 0;
-}
-
-static int sock_userdata_tostring(lua_State *L)
-{
- struct sock_userdata *p = (struct sock_userdata *)
- luaL_checkudata(L, 1, SOCK_METATABLE);
-
- lua_pushfstring(L, "socket: %d", p->fd);
- return 1;
-}
-
-static int sock_userdata_connect(lua_State *L)
-{
- struct sock_userdata *p = (struct sock_userdata *)
- luaL_checkudata(L, 1, SOCK_METATABLE);
- const char *hostname;
- int port;
- struct sockaddr_in addr;
- int res;
-
- if (!lua_isstring(L, 2)) {
- luaL_error(L, _("connect: Expected IP-Address"));
- }
- hostname = lua_tostring(L, 2);
-
- if (!lua_isnumber(L, 3)) {
- luaL_error(L, _("connect: Expected port"));
- }
- port = lua_tointeger(L, 3);
-
- if (lua_gettop(L) == 4) {
- /*
- * Here we expect an event context in the last argument to
- * make connect() asynchronous.
- */
- }
-
- addr.sin_family = AF_INET;
- inet_aton(hostname, &addr.sin_addr);
- addr.sin_port = htons(port);
-
- res = connect(p->fd, (struct sockaddr *)&addr, sizeof(addr));
- if (res == -1) {
- int err = errno;
- lua_pushnil(L);
- lua_pushfstring(L, _("connect failed: %s"), strerror(err));
- return 2;
- }
-
- lua_pushboolean(L, 1);
- return 1;
-}
-
-static const struct luaL_Reg sock_methods[] = {
- {"__gc", sock_userdata_gc},
- {"__tostring", sock_userdata_tostring},
- {"connect", sock_userdata_connect},
- {NULL, NULL}
-};
-
-static const struct {
- const char *name;
- int domain;
-} socket_domains[] = {
- {"PF_UNIX", PF_UNIX},
- {"PF_INET", PF_INET},
- {NULL, 0},
-};
-
-static const struct {
- const char *name;
- int type;
-} socket_types[] = {
- {"SOCK_STREAM", SOCK_STREAM},
- {"SOCK_DGRAM", SOCK_DGRAM},
- {NULL, 0},
-};
-
-static int sock_userdata_new(lua_State *L)
-{
- struct sock_userdata *result;
- const char *domain_str = luaL_checkstring(L, 1);
- const char *type_str = luaL_checkstring(L, 2);
- int i, domain, type;
-
- i = 0;
- while (socket_domains[i].name != NULL) {
- if (strcmp(domain_str, socket_domains[i].name) == 0) {
- break;
- }
- i += 1;
- }
- if (socket_domains[i].name == NULL) {
- return luaL_error(L, _("socket domain %s unknown"), domain_str);
- }
- domain = socket_domains[i].domain;
-
- i = 0;
- while (socket_types[i].name != NULL) {
- if (strcmp(type_str, socket_types[i].name) == 0) {
- break;
- }
- i += 1;
- }
- if (socket_types[i].name == NULL) {
- return luaL_error(L, _("socket type %s unknown"), type_str);
- }
- type = socket_types[i].type;
-
- result = (struct sock_userdata *)lua_newuserdata(L, sizeof(*result));
- ZERO_STRUCTP(result);
-
- result->fd = socket(domain, type, 0);
- if (result->fd == -1) {
- int err = errno;
- lua_pushnil(L);
- lua_pushfstring(L, _("socket() failed: %s"), strerror(errno));
- lua_pushinteger(L, err);
- return 3;
- }
-
- luaL_getmetatable(L, SOCK_METATABLE);
- lua_setmetatable(L, -2);
- return 1;
-}
-
-static const struct luaL_Reg sock_funcs[] = {
- {"new", sock_userdata_new},
- {NULL, NULL}
-};
-
-static int sock_lua_init(lua_State *L, const char *libname) {
- luaL_newmetatable(L, SOCK_METATABLE);
-
- lua_pushvalue(L, -1);
- lua_setfield(L, -2, "__index");
-
- luaL_register(L, NULL, sock_methods);
- luaL_register(L, libname, sock_funcs);
- return 1;
-}
-
-#define EVT_METATABLE "c42e0642-b24a-40f0-8483-d8eb4aee9ea3"
-
-/*
- * The userdata we allocate from lua when a new event context is created
- */
-struct evt_userdata {
- struct event_context *ev;
-};
-
-static bool evt_is_main_thread(lua_State *L) {
- int ret;
-
- ret = lua_pushthread(L);
- lua_pop(L, 1);
- return (ret != 0);
-}
-
-/*
- * Per event we allocate a struct thread_reference to keep the coroutine from
- * being garbage-collected. This is also the hook to find the right thread to
- * be resumed.
- */
-
-struct thread_reference {
- struct lua_State *L;
- /*
- * Reference to the Thread (i.e. lua_State) this event is hanging on
- */
- int thread_ref;
-};
-
-static int thread_reference_destructor(struct thread_reference *ref)
-{
- luaL_unref(ref->L, LUA_REGISTRYINDEX, ref->thread_ref);
- return 0;
-}
-
-static struct thread_reference *evt_reference_thread(TALLOC_CTX *mem_ctx,
- lua_State *L)
-{
- struct thread_reference *result;
-
- result = talloc(mem_ctx, struct thread_reference);
- if (result == NULL) {
- return NULL;
- }
-
- lua_pushthread(L);
- result->thread_ref = luaL_ref(L, LUA_REGISTRYINDEX);
- result->L = L;
- talloc_set_destructor(result, thread_reference_destructor);
-
- return result;
-}
-
-static int evt_userdata_gc(lua_State *L)
-{
- struct evt_userdata *p = (struct evt_userdata *)
- luaL_checkudata(L, 1, EVT_METATABLE);
- TALLOC_FREE(p->ev);
- return 0;
-}
-
-static int evt_userdata_tostring(lua_State *L) {
- lua_pushstring(L, "event context");
- return 1;
-}
-
-static void evt_userdata_sleep_done(struct event_context *event_ctx,
- struct timed_event *te,
- struct timeval now,
- void *priv)
-{
- struct thread_reference *ref = talloc_get_type_abort(
- priv, struct thread_reference);
- lua_resume(ref->L, 0);
- TALLOC_FREE(ref);
-}
-
-static int evt_userdata_sleep(lua_State *L)
-{
- struct evt_userdata *p = (struct evt_userdata *)
- luaL_checkudata(L, 1, EVT_METATABLE);
- lua_Integer usecs = luaL_checkint(L, 2);
- struct thread_reference *ref;
- struct timed_event *te;
-
- if (evt_is_main_thread(L)) {
- /*
- * Block in the main thread
- */
- smb_msleep(usecs/1000);
- return 0;
- }
-
- ref = evt_reference_thread(p->ev, L);
- if (ref == NULL) {
- return luaL_error(L, _("evt_reference_thread failed\n"));
- }
-
- te = event_add_timed(p->ev, ref, timeval_current_ofs(0, usecs),
- evt_userdata_sleep_done,
- ref);
-
- if (te == NULL) {
- TALLOC_FREE(ref);
- return luaL_error(L, _("event_add_timed failed"));
- }
-
- return lua_yield(L, 0);
-}
-
-static int evt_userdata_once(lua_State *L)
-{
- struct evt_userdata *p = (struct evt_userdata *)
- luaL_checkudata(L, 1, EVT_METATABLE);
-
- if (!evt_is_main_thread(L)) {
- return luaL_error(L,
- _("event_once called from non-base thread"));
- }
-
- lua_pushinteger(L, event_loop_once(p->ev));
- return 1;
-}
-
-static const struct luaL_Reg evt_methods[] = {
- {"__gc", evt_userdata_gc},
- {"__tostring", evt_userdata_tostring},
- {"sleep", evt_userdata_sleep},
- {"once", evt_userdata_once},
- {NULL, NULL}
-};
-
-static int evt_userdata_new(lua_State *L) {
- struct evt_userdata *result;
-
- result = (struct evt_userdata *)lua_newuserdata(L, sizeof(*result));
- ZERO_STRUCTP(result);
-
- result->ev = event_context_init(NULL);
- if (result->ev == NULL) {
- return luaL_error(L, _("event_context_init failed"));
- }
-
- luaL_getmetatable(L, EVT_METATABLE);
- lua_setmetatable(L, -2);
- return 1;
-}
-
-static const struct luaL_Reg evt_funcs[] = {
- {"new", evt_userdata_new},
- {NULL, NULL}
-};
-
-static int evt_lua_init(lua_State *L, const char *libname) {
- luaL_newmetatable(L, EVT_METATABLE);
-
- lua_pushvalue(L, -1);
- lua_setfield(L, -2, "__index");
-
- luaL_register(L, NULL, evt_methods);
- luaL_register(L, libname, evt_funcs);
- return 1;
-}
-
-int net_lua(struct net_context *c, int argc, const char **argv)
-{
- lua_State *state;
-
- state = lua_open();
- if (state == NULL) {
- d_fprintf(stderr, _("lua_newstate failed\n"));
- return -1;
- }
-
- luaL_openlibs(state);
- evt_lua_init(state, "event");
- sock_lua_init(state, "socket");
-
- while (1) {
- char *line = NULL;
-
- line = smb_readline("lua> ", NULL, NULL);
- if (line == NULL) {
- break;
- }
-
- if (line[0] == ':') {
- if (luaL_dofile(state, &line[1])) {
- d_printf(_("luaL_dofile returned an error\n"));
- continue;
- }
- } else if (line[0] != '\n') {
- if (luaL_dostring(state, line) != 0) {
- d_printf(_("luaL_dostring returned an "
- "error\n"));
- }
- }
-
- SAFE_FREE(line);
- }
-
- lua_close(state);
- return -1;
-}
int net_usershare_help(struct net_context *c, int argc, const char **argv);
int net_usershare(struct net_context *c, int argc, const char **argv);
-/* The following definitions come from utils/net_lua.c */
-
-int net_lua(struct net_context *c, int argc, const char **argv);
-
/* The following definitions come from utils/net_eventlog.c */
int net_eventlog(struct net_context *c, int argc, const char **argv);
git.samba.org / abartlet / samba.git / .git / commitdiff
