diff -r de6406cd6b25 -r 85f6425a4d74 hedgewars/LuaPas.pas
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hedgewars/LuaPas.pas	Wed Feb 10 00:55:40 2010 +0000
@@ -0,0 +1,1051 @@
+unit LuaPas;
+
+(*
+ * A complete Pascal wrapper for Lua 5.1 DLL module.
+ *
+ * Created by Geo Massar, 2006
+ * Distributed as free/open source.
+ *)
+
+interface
+
+{.$DEFINE LUA_GETHOOK}
+
+type
+  size_t   = type Cardinal;
+  Psize_t  = ^size_t;
+  PPointer = ^Pointer;
+
+  lua_State = record end;
+  Plua_State = ^lua_State;
+
+const
+{$IFDEF UNIX}
+  LuaDLL = 'lua5.1.so';
+//  LuaDLL = 'lua5.1.a';
+{$ELSE}
+  LuaDLL = 'lua5.1.dll';
+{$ENDIF}
+
+
+(*****************************************************************************)
+(*                               luaconfig.h                                 *)
+(*****************************************************************************)
+
+(*
+** $Id: luaconf.h,v 1.81 2006/02/10 17:44:06 roberto Exp $
+** Configuration file for Lua
+** See Copyright Notice in lua.h
+*)
+
+(*
+** {==================================================================
+@@ 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.
+** ===================================================================
+*)
+type
+  LUA_NUMBER_  = type Double;            // ending underscore is needed in Pascal
+  LUA_INTEGER_ = type LongInt;
+
+(*
+@@ 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.
+*)
+const
+  LUA_IDSIZE = 60;
+
+(*
+@@ LUAL_BUFFERSIZE is the buffer size used by the lauxlib buffer system.
+*)
+const
+  LUAL_BUFFERSIZE = 1024;
+
+(*
+@@ 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.)
+*)
+const
+  LUA_PROMPT  = '> ';
+  LUA_PROMPT2 = '>> ';
+
+(*
+@@ 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).
+*)
+function  lua_readline(L : Plua_State; var b : PChar; p : PChar): Boolean;
+procedure lua_saveline(L : Plua_State; idx : LongInt);
+procedure lua_freeline(L : Plua_State; b : PChar);
+
+(*
+@@ 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.
+*/
+#include <io.h>
+#include <stdio.h>
+#define lua_stdin_is_tty()	_isatty(_fileno(stdin))
+*)
+const
+  lua_stdin_is_tty = TRUE;
+
+(*****************************************************************************)
+(*                                  lua.h                                    *)
+(*****************************************************************************)
+
+(*
+** $Id: lua.h,v 1.216 2006/01/10 12:50:13 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
+*)
+
+const
+  LUA_VERSION     = 'Lua 5.1';
+  LUA_VERSION_NUM = 501;
+  LUA_COPYRIGHT   = 'Copyright (C) 1994-2006 Tecgraf, PUC-Rio';
+  LUA_AUTHORS     = 'R. Ierusalimschy, L. H. de Figueiredo & W. Celes';
+
+  (* mark for precompiled code (`<esc>Lua') *)
+  LUA_SIGNATURE = #27'Lua';
+
+  (* option for multiple returns in `lua_pcall' and `lua_call' *)
+  LUA_MULTRET = -1;
+
+  (*
+  ** pseudo-indices
+  *)
+  LUA_REGISTRYINDEX = -10000;
+  LUA_ENVIRONINDEX  = -10001;
+  LUA_GLOBALSINDEX  = -10002;
+
+function lua_upvalueindex(idx : LongInt) : LongInt;   // a marco
+
+const
+  (* thread status; 0 is OK *)
+  LUA_YIELD_    = 1;     // Note: the ending underscore is needed in Pascal
+  LUA_ERRRUN    = 2;
+  LUA_ERRSYNTAX = 3;
+  LUA_ERRMEM    = 4;
+  LUA_ERRERR    = 5;
+
+type
+  lua_CFunction = function(L : Plua_State) : LongInt; cdecl;
+
+  (*
+  ** functions that read/write blocks when loading/dumping Lua chunks
+  *)
+  lua_Reader = function (L : Plua_State; ud : Pointer;
+                         sz : Psize_t) : PChar; cdecl;
+  lua_Writer = function (L : Plua_State; const p : Pointer; sz : size_t;
+                         ud : Pointer) : LongInt; cdecl;
+
+  (*
+  ** prototype for memory-allocation functions
+  *)
+  lua_Alloc = function (ud, ptr : Pointer;
+                        osize, nsize : size_t) : Pointer; cdecl;
+
+const
+  (*
+  ** basic types
+  *)
+  LUA_TNONE          = -1;
+
+  LUA_TNIL           = 0;
+  LUA_TBOOLEAN       = 1;
+  LUA_TLIGHTUSERDATA = 2;
+  LUA_TNUMBER        = 3;
+  LUA_TSTRING        = 4;
+  LUA_TTABLE         = 5;
+  LUA_TFUNCTION      = 6;
+  LUA_TUSERDATA	     = 7;
+  LUA_TTHREAD        = 8;
+
+  (* minimum Lua stack available to a C function *)
+  LUA_MINSTACK = 20;
+
+type
+  (* type of numbers in Lua *)
+  lua_Number = LUA_NUMBER_;
+
+  (* type for integer functions *)
+  lua_Integer = LUA_INTEGER_;
+
+(*
+** state manipulation
+*)
+function  lua_newstate(f : lua_Alloc; ud : Pointer) : Plua_State;
+  cdecl; external LuaDLL;
+procedure lua_close(L: Plua_State);
+  cdecl; external LuaDLL;
+function  lua_newthread(L : Plua_State) : Plua_State;
+  cdecl; external LuaDLL;
+
+function  lua_atpanic(L : Plua_State; panicf : lua_CFunction) : lua_CFunction;
+  cdecl; external LuaDLL;
+
+
+(*
+** basic stack manipulation
+*)
+function  lua_gettop(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+procedure lua_settop(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_pushvalue(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_remove(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_insert(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_replace(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+function  lua_checkstack(L : Plua_State; sz : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+
+procedure lua_xmove(src, dest : Plua_State; n : LongInt);
+  cdecl; external LuaDLL;
+
+
+(*
+** access functions (stack -> C)
+*)
+function lua_isnumber(L : Plua_State; idx : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_isstring(L : Plua_State; idx : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_iscfunction(L : Plua_State; idx : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_isuserdata(L : Plua_State; idx : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_type(L : Plua_State; idx : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+function lua_typename(L : Plua_State; tp : LongInt) : PChar;
+  cdecl; external LuaDLL;
+
+function lua_equal(L : Plua_State; idx1, idx2 : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_rawequal(L : Plua_State; idx1, idx2 : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_lessthan(L : Plua_State; idx1, idx2 : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+
+function lua_tonumber(L : Plua_State; idx : LongInt) : lua_Number;
+  cdecl; external LuaDLL;
+function lua_tointeger(L : Plua_State; idx : LongInt) : lua_Integer;
+  cdecl; external LuaDLL;
+function lua_toboolean(L : Plua_State; idx : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+function lua_tolstring(L : Plua_State; idx : LongInt;
+                       len : Psize_t) : PChar;
+  cdecl; external LuaDLL;
+function lua_objlen(L : Plua_State; idx : LongInt) : size_t;
+  cdecl; external LuaDLL;
+function lua_tocfunction(L : Plua_State; idx : LongInt) : lua_CFunction;
+  cdecl; external LuaDLL;
+function lua_touserdata(L : Plua_State; idx : LongInt) : Pointer;
+  cdecl; external LuaDLL;
+function lua_tothread(L : Plua_State; idx : LongInt) : Plua_State;
+  cdecl; external LuaDLL;
+function lua_topointer(L : Plua_State; idx : LongInt) : Pointer;
+  cdecl; external LuaDLL;
+
+
+(*
+** push functions (C -> stack)
+*)
+procedure lua_pushnil(L : Plua_State);
+  cdecl; external LuaDLL;
+procedure lua_pushnumber(L : Plua_State; n : lua_Number);
+  cdecl; external LuaDLL;
+procedure lua_pushinteger(L : Plua_State; n : lua_Integer);
+  cdecl; external LuaDLL;
+procedure lua_pushlstring(L : Plua_State; const s : PChar; ls : size_t);
+  cdecl; external LuaDLL;
+procedure lua_pushstring(L : Plua_State; const s : PChar);
+  cdecl; external LuaDLL;
+function  lua_pushvfstring(L : Plua_State;
+                           const fmt : PChar; argp : Pointer) : PChar;
+  cdecl; external LuaDLL;
+function  lua_pushfstring(L : Plua_State; const fmt : PChar) : PChar; varargs;
+  cdecl; external LuaDLL;
+procedure lua_pushcclosure(L : Plua_State; fn : lua_CFunction; n : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_pushboolean(L : Plua_State; b : LongBool);
+  cdecl; external LuaDLL;
+procedure lua_pushlightuserdata(L : Plua_State; p : Pointer);
+  cdecl; external LuaDLL;
+function  lua_pushthread(L : Plua_state) : Cardinal;
+  cdecl; external LuaDLL;
+
+
+(*
+** get functions (Lua -> stack)
+*)
+procedure lua_gettable(L : Plua_State ; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_getfield(L : Plua_State; idx : LongInt; k : PChar);
+  cdecl; external LuaDLL;
+procedure lua_rawget(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_rawgeti(L : Plua_State; idx, n : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_createtable(L : Plua_State; narr, nrec : LongInt);
+  cdecl; external LuaDLL;
+function  lua_newuserdata(L : Plua_State; sz : size_t) : Pointer;
+  cdecl; external LuaDLL;
+function  lua_getmetatable(L : Plua_State; objindex : LongInt) : LongBool;
+  cdecl; external LuaDLL;
+procedure lua_getfenv(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+
+
+(*
+** set functions (stack -> Lua)
+*)
+procedure lua_settable(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_setfield(L : Plua_State; idx : LongInt; const k : PChar);
+  cdecl; external LuaDLL;
+procedure lua_rawset(L : Plua_State; idx : LongInt);
+  cdecl; external LuaDLL;
+procedure lua_rawseti(L : Plua_State; idx , n: LongInt);
+  cdecl; external LuaDLL;
+function lua_setmetatable(L : Plua_State; objindex : LongInt): LongBool;
+  cdecl; external LuaDLL;
+function lua_setfenv(L : Plua_State; idx : LongInt): LongBool;
+  cdecl; external LuaDLL;
+
+(*
+** `load' and `call' functions (load and run Lua code)
+*)
+procedure lua_call(L : Plua_State; nargs, nresults : LongInt);
+  cdecl; external LuaDLL;
+function  lua_pcall(L : Plua_State;
+                    nargs, nresults, errfunc : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+function  lua_cpcall(L : Plua_State;
+                     func : lua_CFunction; ud : Pointer) : LongInt;
+  cdecl; external LuaDLL;
+function  lua_load(L : Plua_State; reader : lua_Reader;
+                   dt : Pointer; const chunkname : PChar) : LongInt;
+  cdecl; external LuaDLL;
+
+function lua_dump(L : Plua_State; writer : lua_Writer; data: Pointer) : LongInt;
+  cdecl; external LuaDLL;
+
+
+(*
+** coroutine functions
+*)
+function lua_yield(L : Plua_State; nresults : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+function lua_resume(L : Plua_State; narg : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+function lua_status(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+(*
+** garbage-collection functions and options
+*)
+const
+  LUA_GCSTOP       = 0;
+  LUA_GCRESTART    = 1;
+  LUA_GCCOLLECT    = 2;
+  LUA_GCCOUNT      = 3;
+  LUA_GCCOUNTB	   = 4;
+  LUA_GCSTEP       = 5;
+  LUA_GCSETPAUSE   = 6;
+  LUA_GCSETSTEPMUL = 7;
+
+function lua_gc(L : Plua_State; what, data : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+
+(*
+** miscellaneous functions
+*)
+function lua_error(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function lua_next(L : Plua_State; idx : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+
+procedure lua_concat(L : Plua_State; n : LongInt);
+  cdecl; external LuaDLL;
+
+function  lua_getallocf(L : Plua_State; ud : PPointer) : lua_Alloc;
+  cdecl; external LuaDLL;
+procedure lua_setallocf(L : Plua_State; f : lua_Alloc; ud : Pointer);
+  cdecl; external LuaDLL;
+
+(*
+** ===============================================================
+** some useful macros
+** ===============================================================
+*)
+procedure lua_pop(L : Plua_State; n : LongInt);
+
+procedure lua_newtable(L : Plua_State);
+
+procedure lua_register(L : Plua_State; n : PChar; f : lua_CFunction);
+
+procedure lua_pushcfunction(L : Plua_State; f : lua_CFunction);
+
+function  lua_strlen(L : Plua_State; idx : LongInt) : LongInt;
+
+function lua_isfunction(L : Plua_State; n : LongInt) : Boolean;
+function lua_istable(L : Plua_State; n : LongInt) : Boolean;
+function lua_islightuserdata(L : Plua_State; n : LongInt) : Boolean;
+function lua_isnil(L : Plua_State; n : LongInt) : Boolean;
+function lua_isboolean(L : Plua_State; n : LongInt) : Boolean;
+function lua_isthread(L : Plua_State; n : LongInt) : Boolean;
+function lua_isnone(L : Plua_State; n : LongInt) : Boolean;
+function lua_isnoneornil(L : Plua_State; n : LongInt) : Boolean;
+
+procedure lua_pushliteral(L : Plua_State; s : PChar);
+
+procedure lua_setglobal(L : Plua_State; s : PChar);
+procedure lua_getglobal(L : Plua_State; s : PChar);
+
+function lua_tostring(L : Plua_State; idx : LongInt) : PChar;
+
+
+(*
+** compatibility macros and functions
+*)
+function lua_open : Plua_State;
+
+procedure lua_getregistry(L : Plua_State);
+
+function lua_getgccount(L : Plua_State) : LongInt;
+
+type
+  lua_Chuckreader = type lua_Reader;
+  lua_Chuckwriter = type lua_Writer;
+
+(* ====================================================================== *)
+
+(*
+** {======================================================================
+** Debug API
+** =======================================================================
+*)
+
+(*
+** Event codes
+*)
+const
+  LUA_HOOKCALL    = 0;
+  LUA_HOOKRET     = 1;
+  LUA_HOOKLINE    = 2;
+  LUA_HOOKCOUNT   = 3;
+  LUA_HOOKTAILRET = 4;
+
+
+(*
+** Event masks
+*)
+  LUA_MASKCALL  = 1 shl LUA_HOOKCALL;
+  LUA_MASKRET   = 1 shl LUA_HOOKRET;
+  LUA_MASKLINE  = 1 shl LUA_HOOKLINE;
+  LUA_MASKCOUNT = 1 shl LUA_HOOKCOUNT;
+
+type
+  lua_Debug = packed record
+    event : LongInt;
+    name : PChar;          (* (n) *)
+    namewhat : PChar;      (* (n) `global', `local', `field', `method' *)
+    what : PChar;          (* (S) `Lua', `C', `main', `tail' *)
+    source : PChar;        (* (S) *)
+    currentline : LongInt; (* (l) *)
+    nups : LongInt;        (* (u) number of upvalues *)
+    linedefined : LongInt; (* (S) *)
+    short_src : array [0..LUA_IDSIZE-1] of Char; (* (S) *)
+    (* private part *)
+    i_ci : LongInt;        (* active function *)
+  end;
+  Plua_Debug = ^lua_Debug;
+
+  (* Functions to be called by the debuger in specific events *)
+  lua_Hook = procedure (L : Plua_State; ar : Plua_Debug); cdecl;
+
+
+function lua_getstack(L : Plua_State; level : LongInt;
+                      ar : Plua_Debug) : LongInt;
+  cdecl; external LuaDLL;
+function lua_getinfo(L : Plua_State; const what : PChar;
+                     ar: Plua_Debug): LongInt;
+  cdecl; external LuaDLL;
+function lua_getlocal(L : Plua_State;
+                      ar : Plua_Debug; n : LongInt) : PChar;
+  cdecl; external LuaDLL;
+function lua_setlocal(L : Plua_State;
+                      ar : Plua_Debug; n : LongInt) : PChar;
+  cdecl; external LuaDLL;
+function lua_getupvalue(L : Plua_State; funcindex, n : LongInt) : PChar;
+  cdecl; external LuaDLL;
+function lua_setupvalue(L : Plua_State; funcindex, n : LongInt) : PChar;
+  cdecl; external LuaDLL;
+
+function lua_sethook(L : Plua_State; func : lua_Hook;
+                     mask, count: LongInt): LongInt;
+  cdecl; external LuaDLL;
+{$IFDEF LUA_GETHOOK}
+function lua_gethook(L : Plua_State) : lua_Hook;
+  cdecl; external LuaDLL;
+{$ENDIF}
+
+function lua_gethookmask(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+function lua_gethookcount(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+
+(*****************************************************************************)
+(*                                  lualib.h                                 *)
+(*****************************************************************************)
+
+(*
+** $Id: lualib.h,v 1.36 2005/12/27 17:12:00 roberto Exp $
+** Lua standard libraries
+** See Copyright Notice at the end of this file
+*)
+
+const
+  (* Key to file-handle type *)
+  LUA_FILEHANDLE  = 'FILE*';
+
+  LUA_COLIBNAME   = 'coroutine';
+  LUA_TABLIBNAME  = 'table';
+  LUA_IOLIBNAME   = 'io';
+  LUA_OSLIBNAME   = 'os';
+  LUA_STRLIBNAME  = 'string';
+  LUA_MATHLIBNAME = 'math';
+  LUA_DBLIBNAME   = 'debug';
+  LUA_LOADLIBNAME = 'package';
+
+function luaopen_base(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_table(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_io(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_os(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_string(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_math(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_debug(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaopen_package(L : Plua_State) : LongInt;
+  cdecl; external LuaDLL;
+
+procedure luaL_openlibs(L : Plua_State);
+  cdecl; external LuaDLL;
+
+procedure lua_assert(x : Boolean);    // a macro
+
+
+(*****************************************************************************)
+(*                                  lauxlib.h                                *)
+(*****************************************************************************)
+
+(*
+** $Id: lauxlib.h,v 1.87 2005/12/29 15:32:11 roberto Exp $
+** Auxiliary functions for building Lua libraries
+** See Copyright Notice at the end of this file.
+*)
+
+// not compatibility with the behavior of setn/getn in Lua 5.0
+function  luaL_getn(L : Plua_State; idx : LongInt) : LongInt;
+procedure luaL_setn(L : Plua_State; i, j : LongInt);
+
+const
+  LUA_ERRFILE = LUA_ERRERR + 1;
+
+type
+  luaL_Reg = packed record
+    name : PChar;
+    func : lua_CFunction;
+  end;
+  PluaL_Reg = ^luaL_Reg;
+
+
+procedure luaL_openlib(L : Plua_State; const libname : PChar;
+                       const lr : PluaL_Reg; nup : LongInt);
+  cdecl; external LuaDLL;
+procedure luaL_register(L : Plua_State; const libname : PChar;
+                       const lr : PluaL_Reg);
+  cdecl; external LuaDLL;
+function luaL_getmetafield(L : Plua_State; obj : LongInt;
+                           const e : PChar) : LongInt;
+  cdecl; external LuaDLL;
+function luaL_callmeta(L : Plua_State; obj : LongInt;
+                       const e : PChar) : LongInt;
+  cdecl; external LuaDLL;
+function luaL_typerror(L : Plua_State; narg : LongInt;
+                       const tname : PChar) : LongInt;
+  cdecl; external LuaDLL;
+function luaL_argerror(L : Plua_State; numarg : LongInt;
+                       const extramsg : PChar) : LongInt;
+  cdecl; external LuaDLL;
+function luaL_checklstring(L : Plua_State; numArg : LongInt;
+                           ls : Psize_t) : PChar;
+  cdecl; external LuaDLL;
+function luaL_optlstring(L : Plua_State; numArg : LongInt;
+                         const def: PChar; ls: Psize_t) : PChar;
+  cdecl; external LuaDLL;
+function luaL_checknumber(L : Plua_State; numArg : LongInt) : lua_Number;
+  cdecl; external LuaDLL;
+function luaL_optnumber(L : Plua_State; nArg : LongInt;
+                        def : lua_Number) : lua_Number;
+  cdecl; external LuaDLL;
+
+function luaL_checkinteger(L : Plua_State; numArg : LongInt) : lua_Integer;
+  cdecl; external LuaDLL;
+function luaL_optinteger(L : Plua_State; nArg : LongInt;
+                        def : lua_Integer) : lua_Integer;
+  cdecl; external LuaDLL;
+
+procedure luaL_checkstack(L : Plua_State; sz : LongInt; const msg : PChar);
+  cdecl; external LuaDLL;
+procedure luaL_checktype(L : Plua_State; narg, t : LongInt);
+  cdecl; external LuaDLL;
+procedure luaL_checkany(L : Plua_State; narg : LongInt);
+  cdecl; external LuaDLL;
+
+function luaL_newmetatable(L : Plua_State; const tname : PChar) : LongInt;
+  cdecl; external LuaDLL;
+function luaL_checkudata(L : Plua_State; ud : LongInt;
+                         const tname : PChar) : Pointer;
+  cdecl; external LuaDLL;
+
+procedure luaL_where(L : Plua_State; lvl : LongInt);
+  cdecl; external LuaDLL;
+function  luaL_error(L : Plua_State; const fmt : PChar) : LongInt; varargs;
+  cdecl; external LuaDLL;
+
+function luaL_checkoption(L : Plua_State; narg : LongInt; const def : PChar;
+                          const lst : array of PChar) : LongInt;
+  cdecl; external LuaDLL;
+
+function  luaL_ref(L : Plua_State; t : LongInt) : LongInt;
+  cdecl; external LuaDLL;
+procedure luaL_unref(L : Plua_State; t, ref : LongInt);
+  cdecl; external LuaDLL;
+
+function luaL_loadfile(L : Plua_State; const filename : PChar) : LongInt;
+  cdecl; external LuaDLL;
+function luaL_loadbuffer(L : Plua_State; const buff : PChar;
+                         sz : size_t; const name: PChar) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaL_loadstring(L : Plua_State; const s : Pchar) : LongInt;
+  cdecl; external LuaDLL;
+
+function luaL_newstate : Plua_State;
+  cdecl; external LuaDLL;
+
+function luaL_gsub(L : Plua_State; const s, p, r : PChar) : PChar;
+  cdecl; external LuaDLL;
+
+function luaL_findtable(L : Plua_State; idx : LongInt;
+                        const fname : PChar; szhint : LongInt) : PChar;
+  cdecl; external LuaDLL;
+
+
+(*
+** ===============================================================
+** some useful macros
+** ===============================================================
+*)
+
+function luaL_argcheck(L : Plua_State; cond : Boolean; numarg : LongInt;
+                       extramsg : PChar): LongInt;
+function luaL_checkstring(L : Plua_State; n : LongInt) : PChar;
+function luaL_optstring(L : Plua_State; n : LongInt; d : PChar) : PChar;
+function luaL_checkint(L : Plua_State; n : LongInt) : LongInt;
+function luaL_optint(L : Plua_State; n, d : LongInt): LongInt;
+function luaL_checklong(L : Plua_State; n : LongInt) : LongInt;
+function luaL_optlong(L : Plua_State; n : LongInt; d : LongInt) : LongInt;
+
+function luaL_typename(L : Plua_State; idx : LongInt) : PChar;
+
+function luaL_dofile(L : Plua_State; fn : PChar) : LongInt;
+
+function luaL_dostring(L : Plua_State; s : PChar) : LongInt;
+
+procedure luaL_getmetatable(L : Plua_State; n : PChar);
+
+(* not implemented yet
+#define luaL_opt(L,f,n,d) (lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))
+*)
+
+(*
+** {======================================================
+** Generic Buffer manipulation
+** =======================================================
+*)
+
+type
+  luaL_Buffer = packed record
+    p : PChar;       (* current position in buffer *)
+    lvl : LongInt;   (* number of strings in the stack (level) *)
+    L : Plua_State;
+    buffer : array [0..LUAL_BUFFERSIZE-1] of Char;
+  end;
+  PluaL_Buffer = ^luaL_Buffer;
+
+procedure luaL_addchar(B : PluaL_Buffer; c : Char);
+
+(* compatibility only *)
+procedure luaL_putchar(B : PluaL_Buffer; c : Char);
+
+procedure luaL_addsize(B : PluaL_Buffer; n : LongInt);
+
+procedure luaL_buffinit(L : Plua_State; B : PluaL_Buffer);
+  cdecl; external LuaDLL;
+function  luaL_prepbuffer(B : PluaL_Buffer) : PChar;
+  cdecl; external LuaDLL;
+procedure luaL_addlstring(B : PluaL_Buffer; const s : PChar; ls : size_t);
+  cdecl; external LuaDLL;
+procedure luaL_addstring(B : PluaL_Buffer; const s : PChar);
+  cdecl; external LuaDLL;
+procedure luaL_addvalue(B : PluaL_Buffer);
+  cdecl; external LuaDLL;
+procedure luaL_pushresult(B : PluaL_Buffer);
+  cdecl; external LuaDLL;
+
+(* ====================================================== *)
+
+
+(* compatibility with ref system *)
+
+(* pre-defined references *)
+const
+  LUA_NOREF  = -2;
+  LUA_REFNIL = -1;
+
+function lua_ref(L : Plua_State; lock : Boolean) : LongInt;
+
+procedure lua_unref(L : Plua_State; ref : LongInt);
+
+procedure lua_getref(L : Plua_State; ref : LongInt);
+
+
+(******************************************************************************)
+(******************************************************************************)
+(******************************************************************************)
+
+implementation
+
+uses
+  SysUtils;
+
+(*****************************************************************************)
+(*                            luaconfig.h                                    *)
+(*****************************************************************************)
+
+function  lua_readline(L : Plua_State; var b : PChar; p : PChar): Boolean;
+var
+  s : AnsiString;
+begin
+  Write(p);                        // show prompt
+  ReadLn(s);                       // get line
+  b := PChar(s);                   //   and return it
+  lua_readline := (b[0] <> #4);          // test for ctrl-D
+end;
+
+procedure lua_saveline(L : Plua_State; idx : LongInt);
+begin
+end;
+
+procedure lua_freeline(L : Plua_State; b : PChar);
+begin
+end;
+
+
+(*****************************************************************************)
+(*                                  lua.h                                    *)
+(*****************************************************************************)
+
+function lua_upvalueindex(idx : LongInt) : LongInt;
+begin
+  lua_upvalueindex := LUA_GLOBALSINDEX - idx;
+end;
+
+procedure lua_pop(L : Plua_State; n : LongInt);
+begin
+  lua_settop(L, -n - 1);
+end;
+
+procedure lua_newtable(L : Plua_State);
+begin
+  lua_createtable(L, 0, 0);
+end;
+
+procedure lua_register(L : Plua_State; n : PChar; f : lua_CFunction);
+begin
+  lua_pushcfunction(L, f);
+  lua_setglobal(L, n);
+end;
+
+procedure lua_pushcfunction(L : Plua_State; f : lua_CFunction);
+begin
+  lua_pushcclosure(L, f, 0);
+end;
+
+function  lua_strlen(L : Plua_State; idx : LongInt) : LongInt;
+begin
+  lua_strlen := lua_objlen(L, idx);
+end;
+
+function lua_isfunction(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_isfunction := lua_type(L, n) = LUA_TFUNCTION;
+end;
+
+function lua_istable(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_istable := lua_type(L, n) = LUA_TTABLE;
+end;
+
+function lua_islightuserdata(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_islightuserdata := lua_type(L, n) = LUA_TLIGHTUSERDATA;
+end;
+
+function lua_isnil(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_isnil := lua_type(L, n) = LUA_TNIL;
+end;
+
+function lua_isboolean(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_isboolean := lua_type(L, n) = LUA_TBOOLEAN;
+end;
+
+function lua_isthread(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_isthread := lua_type(L, n) = LUA_TTHREAD;
+end;
+
+function lua_isnone(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_isnone := lua_type(L, n) = LUA_TNONE;
+end;
+
+function lua_isnoneornil(L : Plua_State; n : LongInt) : Boolean;
+begin
+  lua_isnoneornil := lua_type(L, n) <= 0;
+end;
+
+procedure lua_pushliteral(L : Plua_State; s : PChar);
+begin
+  lua_pushlstring(L, s, StrLen(s));
+end;
+
+procedure lua_setglobal(L : Plua_State; s : PChar);
+begin
+  lua_setfield(L, LUA_GLOBALSINDEX, s);
+end;
+
+procedure lua_getglobal(L: Plua_State; s: PChar);
+begin
+  lua_getfield(L, LUA_GLOBALSINDEX, s);
+end;
+
+function lua_tostring(L : Plua_State; idx : LongInt) : PChar;
+begin
+  lua_tostring := lua_tolstring(L, idx, nil);
+end;
+
+function lua_open : Plua_State;
+begin
+  lua_open := luaL_newstate;
+end;
+
+procedure lua_getregistry(L : Plua_State);
+begin
+  lua_pushvalue(L, LUA_REGISTRYINDEX);
+end;
+
+function lua_getgccount(L : Plua_State) : LongInt;
+begin
+  lua_getgccount := lua_gc(L, LUA_GCCOUNT, 0);
+end;
+
+
+(*****************************************************************************)
+(*                                  lualib.h                                 *)
+(*****************************************************************************)
+
+procedure lua_assert(x : Boolean);
+begin
+end;
+
+
+(*****************************************************************************)
+(*                                  lauxlib.h    n                           *)
+(*****************************************************************************)
+
+function luaL_getn(L : Plua_State; idx : LongInt) : LongInt;
+begin
+  luaL_getn := lua_objlen(L, idx);
+end;
+
+procedure luaL_setn(L : plua_State; i, j : LongInt);
+begin
+  (* no op *)
+end;
+
+function luaL_argcheck(L : Plua_State; cond : Boolean; numarg : LongInt;
+                       extramsg : PChar): LongInt;
+begin
+  if not cond then
+    luaL_argcheck := luaL_argerror(L, numarg, extramsg)
+  else
+    luaL_argcheck := 0;
+end;
+
+function luaL_checkstring(L : Plua_State; n : LongInt) : PChar;
+begin
+  luaL_checkstring := luaL_checklstring(L, n, nil);
+end;
+
+function luaL_optstring(L : Plua_State; n : LongInt; d : PChar) : PChar;
+begin
+  luaL_optstring := luaL_optlstring(L, n, d, nil);
+end;
+
+function luaL_checkint(L : Plua_State; n : LongInt) : LongInt;
+begin
+  luaL_checkint := luaL_checkinteger(L, n);
+end;
+
+function luaL_optint(L : Plua_State; n, d : LongInt): LongInt;
+begin
+  luaL_optint := luaL_optinteger(L, n, d);
+end;
+
+function luaL_checklong(L : Plua_State; n : LongInt) : LongInt;
+begin
+  luaL_checklong := luaL_checkinteger(L, n);
+end;
+
+function luaL_optlong(L : Plua_State; n : LongInt; d : LongInt) : LongInt;
+begin
+  luaL_optlong := luaL_optinteger(L, n, d);
+end;
+
+function luaL_typename(L : Plua_State; idx : LongInt) : PChar;
+begin
+  luaL_typename := lua_typename( L, lua_type(L, idx) );
+end;
+
+function luaL_dofile(L : Plua_State; fn : PChar) : LongInt;
+begin
+  luaL_dofile := luaL_loadfile(L, fn);
+  if luaL_dofile = 0 then
+    luaL_dofile := lua_pcall(L, 0, 0, 0);
+end;
+
+function luaL_dostring(L : Plua_State; s : PChar) : LongInt;
+begin
+  luaL_dostring := luaL_loadstring(L, s);
+  if luaL_dostring = 0 then
+    luaL_dostring := lua_pcall(L, 0, 0, 0);
+end;
+
+procedure luaL_getmetatable(L : Plua_State; n : PChar);
+begin
+  lua_getfield(L, LUA_REGISTRYINDEX, n);
+end;
+
+procedure luaL_addchar(B : PluaL_Buffer; c : Char);
+begin
+  if not(B^.p < B^.buffer + LUAL_BUFFERSIZE) then
+    luaL_prepbuffer(B);
+  B^.p^ := c;
+  Inc(B^.p);
+end;
+
+procedure luaL_putchar(B : PluaL_Buffer; c : Char);
+begin
+  luaL_addchar(B, c);
+end;
+
+procedure luaL_addsize(B : PluaL_Buffer; n : LongInt);
+begin
+  Inc(B^.p, n);
+end;
+
+function lua_ref(L : Plua_State; lock : Boolean) : LongInt;
+begin
+  if lock then
+    lua_ref := luaL_ref(L, LUA_REGISTRYINDEX)
+  else begin
+    lua_pushstring(L, 'unlocked references are obsolete');
+    lua_error(L);
+    lua_ref := 0;
+  end;
+end;
+
+procedure lua_unref(L : Plua_State; ref : LongInt);
+begin
+  luaL_unref(L, LUA_REGISTRYINDEX, ref);
+end;
+
+procedure lua_getref(L : Plua_State; ref : LongInt);
+begin
+  lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
+end;
+
+
+(******************************************************************************
+* Original copyright for the lua source and headers:
+*  1994-2004 Tecgraf, PUC-Rio.
+*  www.lua.org.
+*
+*
+* 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.
+