delphi调用LUA函数来处理一些逻辑

替同事做了个洛奇英雄传自动染色程序,关于屏幕取色的.因为里面他对颜色的要求比较复杂,改动也比较大,于是我让他把逻辑写在 lua 脚本里面.

uses LUA, LUALIB;

function lua_CheckColor(r,g,b:Integer):Boolean;
var
Lua : TLua;
begin
  Lua := TLua.Create; 
  luaopen_debug(Lua.LuaInstance); //如果要使用debug库
//  luaopen_io(Lua.LuaInstance);
  luaopen_math(Lua.LuaInstance);// 如果要使用math库 不然就会attempt to index global 'math' (a nil value)
  luaopen_os(Lua.LuaInstance);
//  luaopen_package(Lua.LuaInstance);
  luaopen_string(Lua.LuaInstance);
  luaopen_table(Lua.LuaInstance);
  Lua.DoFile('lua_GetColor.lua');
  lua_getglobal(Lua.LuaInstance,'nogi_GetColor');
  lua_pushnumber(Lua.LuaInstance, r); //将脚本中add函数使用的参数压栈
  lua_pushnumber(Lua.LuaInstance, g); //将脚本中add函数使用的参数压栈
  lua_pushnumber(Lua.LuaInstance, b); //将脚本中add函数使用的参数压栈


  lua_pcall(Lua.LuaInstance, 3, 1,0) ;


  Result := (lua_toInteger(Lua.LuaInstance,-1) = 1);
  Lua.Free;
end;

LUA 里面的内容是这样的

function nogi_GetColor(nR,nG,nB)
	if nR <= 25 and nG <= 25 and nB <= 25 then -- 取出25以下黑色
		return 1;
	end;
	
	return 0;
end

附上我这里带的 LUA.PAS 和 LUALIB.PAS

lua.pas

{
/**
 * @package     Delphi Lua
 * @copyright   Copyright (c) 2009 Dennis D. Spreen (http://www.spreendigital.de/blog)
 * @license     http://opensource.org/licenses/gpl-license.php GNU Public License
 * @author      Dennis D. Spreen 
 * @version     1.3
 * @revision    $Id: Lua.pas 102 2009-09-30 11:39:41Z dennis.spreen $
 */

History
1.3     DS      Improved Callback, now uses pointer instead of object index
                Modified RegisterFunctions to allow methods from other class
                to be registered, moved object table into TLua class
1.2	DS	Added example on how to extend lua with a delphi dll
1.1     DS      Improved global object table, this optimizes the delphi
                function calls
1.0     DS      Initial Release

Copyright 2009  Dennis D. Spreen (email : [email protected])

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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
}

unit Lua;

interface

uses
  Classes,
  LuaLib;

type
  TLuaState = Lua_State;

  TLua = class(TObject)
  private
    fAutoRegister: Boolean;
    CallbackList: TList;  // internal callback list
  public
    LuaInstance: TLuaState;  // Lua instance
    constructor Create(AutoRegister: Boolean = True); overload; virtual;
    destructor Destroy; override;
    function DoFile(Filename: String): Integer; virtual;// load file and execute
    procedure RegisterFunction(FuncName: AnsiString; MethodName: AnsiString = ''; Obj: TObject = NIL); virtual; //register function
    procedure AutoRegisterFunctions(Obj: TObject);  // register all published functions
    procedure UnregisterFunctions(Obj: TObject); // unregister all object functions
  end;

implementation

type
  TProc = function(L: TLuaState): Integer of object; // Lua Function

  TCallback = class
    Routine: TMethod;  // Code and Data for the method
    Exec: TProc;       // Resulting execution function
  end;

//
// This function is called by Lua, it extracts the object by
// pointer to the objects method by name, which is then called.
//
// @param       Lua_State   L   Pointer to Lua instance
// @return      Integer         Number of result arguments on stack
//
function LuaCallBack(L: Lua_State): Integer; cdecl;
var
  CallBack: TCallBack;       // The Object stored in the Object Table
begin
  // Retrieve first Closure Value (=Object Pointer)
  CallBack := lua_topointer(L, lua_upvalueindex(1));

  // Execute only if Object is valid
  if (assigned(CallBack) and assigned(CallBack.Exec)) then
    Result := CallBack.Exec(L)
  else
    Result := 0;
end;

{ TLua }

//
// Create a new Lua instance and optionally create Lua functions
//
// @param       Boolean      AutoRegister       (optional)
// @return      TLua                            Lua Instance
//
constructor TLua.Create(AutoRegister: Boolean = True);
begin
  inherited Create;
  // Load Lua Lib if not already done
  if (not LuaLibLoaded) then
    LoadLuaLib;

  // Open Library
  LuaInstance := Lua_Open();
  luaopen_base(LuaInstance);

  fAutoRegister := AutoRegister;

  // Create Object List on initialization
  CallBackList := TList.Create;

  // if set then register published functions
  if (AutoRegister) then
    AutoRegisterFunctions(self);
end;

//
// Dispose Lua instance
//
destructor TLua.Destroy;
begin
  // Unregister all functions if previously autoregistered
  if (fAutoRegister) then
    UnregisterFunctions(Self);

  // dispose Object List on finalization
  CallBackList.Free;

  // Close instance
  Lua_Close(LuaInstance);
  inherited;
end;

//
// Wrapper for Lua File load and Execution
//
// @param       String  Filename        Lua Script file name
// @return      Integer
//
function TLua.DoFile(Filename: String): Integer;
begin
  Result := lual_dofile(LuaInstance, PAnsiChar(AnsiString(Filename)));
end;

//
// Register a new Lua Function and map it to the Objects method name
//
// @param       AnsiString      FuncName        Lua Function Name
// @param       AnsiString      MethodName      (optional) Objects Method name
//
procedure TLua.RegisterFunction(FuncName: AnsiString; MethodName: AnsiString = ''; Obj: TObject = NIL);
var
  CallBack: TCallBack; // Callback Object
begin
  // if method name not specified use Lua function name
  if (MethodName = '') then
    MethodName := FuncName;

  // if not object specified use this object
  if (Obj = NIL) then
    Obj := Self;

  // Add Callback Object to the Object Index
  CallBack := TCallBack.Create;
  CallBack.Routine.Data := Obj;
  CallBack.Routine.Code := Obj.MethodAddress(String(MethodName));
  CallBack.Exec := TProc(CallBack.Routine);
  CallbackList.Add(CallBack);

  // prepare Closure value (Method Name)
  lua_pushstring(LuaInstance, PAnsiChar(FuncName));

  // prepare Closure value (CallBack Object Pointer)
  lua_pushlightuserdata(LuaInstance, CallBack);

  // set new Lua function with Closure value
  lua_pushcclosure(LuaInstance, LuaCallBack, 1);
  lua_settable(LuaInstance, LUA_GLOBALSINDEX);
end;

//
// UnRegister all new Lua Function
//
// @param       TObject     Object      Object with prev registered lua functions
//
procedure TLua.UnregisterFunctions(Obj: TObject);
var
  I: Integer;
  CallBack: TCallBack;
begin
  // remove obj from object list
  for I := CallBackList.Count downto 1 do
  begin
    CallBack := CallBackList[I-1];
    if (assigned(CallBack)) and (CallBack.Routine.Data = Obj) then
    begin
      CallBack.Free;
      CallBackList.Items[I-1] := NIL;
      CallBackList.Delete(I-1);
    end;
  end;
end;

//
// Register all published methods as Lua Functions
//
procedure TLua.AutoRegisterFunctions(Obj: TObject);
type
  PPointer = ^Pointer;
  PMethodRec = ^TMethodRec;

  TMethodRec = packed record
    wSize: Word;
    pCode: Pointer;
    sName: ShortString;
  end;
var
  MethodTable: PAnsiChar;
  MethodRec: PMethodRec;
  wCount: Word;
  nMethod: Integer;
begin
  // Get a pointer to the class's published method table
  MethodTable := PAnsiChar(Pointer(PAnsiChar(Obj.ClassType) + vmtMethodTable)^);

  if (MethodTable <> Nil) then
  begin
    // Get the count of the methods in the table
    Move(MethodTable^, wCount, 2);

    // Position the MethodRec pointer at the first method in the table
    // (skip over the 2-byte method count)
    MethodRec := PMethodRec(MethodTable + 2);

    // Iterate through all the published methods of this class
    for nMethod := 0 to wCount - 1 do
    begin
      // Add the method name to the lua functions
      RegisterFunction(MethodRec.sName, MethodRec.sName, Obj);
      // Skip to the next method
      MethodRec := PMethodRec(PAnsiChar(MethodRec) + MethodRec.wSize);
    end;
  end;
end;


end.

lualib.pas

(******************************************************************************
* Original copyright for the lua source and headers:
*  1994-2004 Tecgraf, PUC-Rio.
*  www.lua.org.
*
* Copyright for the Delphi adaptation:
*  2005 Rolf Meyerhoff
*  www.matrix44.de
*
* Copyright for the Lua 5.1 adaptation:
*  2007 Marco Antonio Abreu
*  www.marcoabreu.eti.br
*
*  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.
******************************************************************************)
unit LuaLib;

interface

const
  LUA_VERSION   = 'Lua 5.1';
  LUA_RELEASE   = 'Lua 5.1.2';
  LUA_COPYRIGHT = 'Copyright (C) 1994-2004 Tecgraf, PUC-Rio';
  LUA_AUTHORS   = 'R. Ierusalimschy, L. H. de Figueiredo & W. Celes';

  LUA_PASCAL_51_AUTHOR = 'Marco Antonio Abreu';
  LUA_PASCAL_51_COPYRIGHT = 'Copyright (C) 2007 Marco Antonio Abreu';

  (* mark for precompiled code (`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;

  (* thread status; 0 is OK *)
  LUA_TRD_YIELD = 1;
  LUA_ERRRUN    = 2;
  LUA_ERRSYNTAX = 3;
  LUA_ERRMEM    = 4;
  LUA_ERRERR    = 5;

  (* extra error code for `luaL_load' *)
  LUA_ERRFILE   = LUA_ERRERR + 1;

  (*
  ** 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;

  (*
  ** garbage-collection function and options
  *)
  LUA_GCSTOP        = 0;
  LUA_GCRESTART     = 1;
  LUA_GCCOLLECT     = 2;
  LUA_GCCOUNT       = 3;
  LUA_GCCOUNTB      = 4;
  LUA_GCSTEP        = 5;
  LUA_GCSETPAUSE    = 6;
  LUA_GCSETSTEPMUL  = 7;

  (*
  ** {======================================================================
  ** Debug API
  ** =======================================================================
  *)

  (*
  ** Event codes
  *)
  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);

  (*
  ** {======================================================================
  ** useful definitions for Lua kernel and libraries
  ** =======================================================================
  *)

  (*
  @@ 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.
  *)
  LUA_NUMBER_SCAN	=	'%lf';
  LUA_NUMBER_FMT	 =	'%.14g';
  LUAI_MAXNUMBER2STR =	32;  (* 16 digits, sign, point, and \0 *)

  (* pre-defined references *)
  LUA_NOREF  = -2;
  LUA_REFNIL = -1;

  LUA_IDSIZE = 60;

  (*
  ** package names
  *)
  LUA_COLIBNAME   = 'coroutine';
  LUA_TABLIBNAME  = 'table';
  LUA_IOLIBNAME   = 'io';
  LUA_OSLIBNAME   = 'os';
  LUA_STRLIBNAME  = 'string';
  LUA_MATHLIBNAME = 'math';
  LUA_DBLIBNAME   = 'debug';
  LUA_LOADLIBNAME = 'package';

  (*
  ** {======================================================
  ** Generic Buffer manipulation
  ** =======================================================
  *)

  BUFSIZ = 512; (* From stdio.h *)
  LUAL_BUFFERSIZE = BUFSIZ;

type
  lua_State = type Pointer;

  lua_CFunction = function(L: lua_State): Integer; cdecl;

  (*
  ** functions that read/write blocks when loading/dumping Lua chunks
  *)
  lua_Reader = function(L: lua_State; data: Pointer; var size: Cardinal): PAnsiChar; cdecl;
  lua_Writer = function(L: lua_State; p: Pointer; sz: Cardinal; ud: Pointer): Integer; cdecl;

  (*
  ** prototype for memory-allocation functions
  *)
  lua_Alloc = function(ud, ptr: Pointer; osize, nsize: Cardinal): Pointer; cdecl;

  (* type of numbers in Lua *)
  lua_Number  = type double;
  (* type for integer functions *)
  lua_Integer = type integer;

  lua_Debug = packed record
    event: Integer;
    name: PAnsiChar; (* (n) *)
    namewhat: PAnsiChar; (* (n) `global', `local', `field', `method' *)
    what: PAnsiChar; (* (S) `Lua', `C', `main', `tail' *)
    source: PAnsiChar; (* (S) *)
    currentline: Integer; (* (l) *)
    nups: Integer;  (* (u) number of upvalues *)
    linedefined: Integer; (* (S) *)
    lastlinedefine: Integer;	(* (S) *)
    short_src: array[0..LUA_IDSIZE - 1] of AnsiChar; (* (S) *)
    (* private part *)
    i_ci: Integer; (* active function *)
  end;

  (* Functions to be called by the debuger in specific events *)
  lua_Hook = procedure(L: lua_State; var ar: lua_Debug); cdecl;

  (* Lua Record *)
  PluaL_reg = ^luaL_reg;
  luaL_reg = packed record
    name: PAnsiChar;
    func: lua_CFunction;
  end;

  (*
  ** {======================================================
  ** Generic Buffer manipulation
  ** =======================================================
  *)

  luaL_Buffer = packed record
    p: PAnsiChar; (* current position in buffer *)
    lvl: Integer;  (* number of strings in the stack (level) *)
    L: lua_State;
    buffer: array[0..LUAL_BUFFERSIZE - 1] of AnsiChar;
  end;

var
  (*
  ** state manipulation
  *)
  lua_newstate:  function(f: lua_Alloc; ud: Pointer): lua_State; cdecl;
  lua_close:     procedure(L: lua_State); cdecl;
  lua_newthread: function(L: lua_State): lua_State; cdecl;
  lua_atpanic:   function(L: lua_State; panicf: lua_CFunction): lua_CFunction; cdecl;

  (*
  ** basic stack manipulation
  *)
  lua_gettop:     function(L: lua_State): Integer; cdecl;
  lua_settop:     procedure(L: lua_State; idx: Integer); cdecl;
  lua_pushvalue:  procedure(L: lua_State; idx: Integer); cdecl;
  lua_remove:     procedure(L: lua_State; idx: Integer); cdecl;
  lua_insert:     procedure(L: lua_State; idx: Integer); cdecl;
  lua_replace:    procedure(L: lua_State; idx: Integer); cdecl;
  lua_checkstack: function(L: lua_State; extra: Integer): LongBool; cdecl;
  lua_xmove:      procedure(from, dest: lua_State; n: Integer); cdecl;

  (*
  ** access functions (stack -> C/Pascal)
  *)

  lua_isnumber:    function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_isstring:    function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_iscfunction: function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_isuserdata:  function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_type:        function(L: lua_State; idx: Integer): Integer; cdecl;
  lua_typename:    function(L: lua_State; tp: Integer): PAnsiChar; cdecl;

  lua_equal:       function(L: lua_State; idx1, idx2: Integer): LongBool; cdecl;
  lua_rawequal:    function(L: lua_State; idx1, idx2: Integer): LongBool; cdecl;
  lua_lessthan:    function(L: lua_State; idx1, idx2: Integer): LongBool; cdecl;

  lua_tonumber:    function(L: lua_State; idx: Integer): lua_Number; cdecl;
  lua_tointeger:   function(L: lua_State; idx: Integer): lua_Integer; cdecl;
  lua_toboolean:   function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_tolstring:   function(L: lua_State; idx: Integer; var len: Cardinal): PAnsiChar; cdecl;
  lua_objlen:      function(L: lua_State; idx: Integer): Cardinal; cdecl;
  lua_tocfunction: function(L: lua_State; idx: Integer): lua_CFunction; cdecl;
  lua_touserdata:  function(L: lua_State; idx: Integer): Pointer; cdecl;
  lua_tothread:    function(L: lua_State; idx: Integer): lua_State; cdecl;
  lua_topointer:   function(L: lua_State; idx: Integer): Pointer; cdecl;

  (*
  ** push functions (C/Pascal -> stack)
  *)
  lua_pushnil:      procedure(L: lua_State); cdecl;
  lua_pushnumber:   procedure(L: lua_State; n: lua_Number); cdecl;
  lua_pushinteger:  procedure(L: lua_State; n: lua_Integer); cdecl;
  lua_pushlstring:  procedure(L: lua_State; s: PAnsiChar; len: Cardinal); cdecl;
  lua_pushstring:   procedure(L: lua_State; s: PAnsiChar); cdecl;
  lua_pushvfstring: function(L: lua_State; fmt, argp: PAnsiChar): PAnsiChar; cdecl;

  lua_pushfstring:  function(L: lua_State; fmt: PAnsiChar; args: array of const): PAnsiChar; cdecl;
  lua_pushcclosure: procedure(L: lua_State; fn: lua_CFunction; n: Integer); cdecl;
  lua_pushboolean:  procedure(L: lua_State; b: LongBool); cdecl;
  lua_pushlightuserdata: procedure(L: lua_State; p: Pointer); cdecl;
  lua_pushthread:   function(L: lua_State): Integer; cdecl;

  (*
  ** get functions (Lua -> stack)
  *)
  lua_gettable:     procedure(L: lua_State; idx: Integer); cdecl;
  lua_getfield:     procedure(L: lua_State; idx: Integer; k: PAnsiChar); cdecl;
  lua_rawget:       procedure(L: lua_State; idx: Integer); cdecl;
  lua_rawgeti:      procedure(L: lua_State; idx, n: Integer); cdecl;
  lua_createtable:  procedure(L: lua_State; narr, nrec: Integer); cdecl;
  lua_newuserdata:  function(L: lua_State; size: Cardinal): Pointer; cdecl;
  lua_getmetatable: function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_getfenv:      procedure(L: lua_State; idx: Integer); cdecl;

  (*
  ** set functions (stack -> Lua)
  *)
  lua_settable:     procedure(L: lua_State; idx: Integer); cdecl;
  lua_setfield:     procedure(L: lua_State; idx: Integer; k: PAnsiChar ); cdecl;
  lua_rawset:       procedure(L: lua_State; idx: Integer); cdecl;
  lua_rawseti:      procedure(L: lua_State; idx, n: Integer); cdecl;
  lua_setmetatable: function(L: lua_State; idx: Integer): LongBool; cdecl;
  lua_setfenv:      function(L: lua_State; idx: Integer): LongBool; cdecl;

  (*
  ** `load' and `call' functions (load and run Lua code)
  *)
  lua_call:   procedure(L: lua_State; nargs, nresults: Integer); cdecl;
  lua_pcall:  function(L: lua_State; nargs, nresults, errfunc: Integer): Integer; cdecl;
  lua_cpcall: function(L: lua_State; func: lua_CFunction; ud: Pointer): Integer; cdecl;
  lua_load:   function(L: lua_State; reader: lua_Reader; data: Pointer; chunkname: PAnsiChar): Integer; cdecl;
  lua_dump:   function(L: lua_State; writer: lua_Writer; data: Pointer): Integer; cdecl;

  (*
  ** coroutine functions
  *)
  lua_yield:  function(L: lua_State; nresults: Integer): Integer; cdecl;
  lua_resume: function(L: lua_State; narg: Integer): Integer; cdecl;
  lua_status: function(L: lua_State): Integer; cdecl;

  (*
  ** garbage-collection functions
  *)
  lua_gc: function(L: lua_State; what, data: Integer): Integer; cdecl;

  (*
  ** miscellaneous functions
  *)

  lua_error:  function(L: lua_State): Integer; cdecl;
  lua_next:   function(L: lua_State; idx: Integer): Integer; cdecl;
  lua_concat: procedure(L: lua_State; n: Integer); cdecl;

  lua_getallocf: function(L: lua_State; ud: Pointer): lua_Alloc; cdecl;
  lua_setallocf: procedure(L: lua_State; f: lua_Alloc; ud: Pointer); cdecl;

  (*
  ** {======================================================================
  ** Debug API
  ** =======================================================================
  *)

  lua_getstack:   function(L: lua_State; level: Integer; var ar: lua_Debug): Integer; cdecl;
  lua_getinfo:    function(L: lua_State; what: PAnsiChar; var ar: lua_Debug): Integer; cdecl;
  lua_getlocal:   function(L: lua_State; var ar: lua_Debug; n: Integer): PAnsiChar; cdecl;
  lua_setlocal:   function(L: lua_State; var ar: lua_Debug; n: Integer): PAnsiChar; cdecl;
  lua_getupvalue: function(L: lua_State; funcindex, n: Integer): PAnsiChar; cdecl;
  lua_setupvalue: function(L: lua_State; funcindex, n: Integer): PAnsiChar; cdecl;

  lua_sethook:      function(L: lua_State; func: lua_Hook; mask, count: Integer): Integer; cdecl;
  lua_gethook:      function(L: lua_State): lua_Hook; cdecl;
  lua_gethookmask:  function(L: lua_State): Integer; cdecl;
  lua_gethookcount: function(L: lua_State): Integer; cdecl;

  (* lua libraries *)
  luaopen_base:    function(L: lua_State): Integer; cdecl;
  luaopen_debug:   function(L: lua_State): Integer; cdecl;
  luaopen_io:      function(L: lua_State): Integer; cdecl;
  luaopen_math:    function(L: lua_State): Integer; cdecl;
  luaopen_os:      function(L: lua_State): Integer; cdecl;
  luaopen_package: function(L: lua_State): Integer; cdecl;
  luaopen_string:  function(L: lua_State): Integer; cdecl;
  luaopen_table:   function(L: lua_State): Integer; cdecl;
  (* open all previous libraries *)
  luaL_openlibs:   procedure(L: lua_State); cdecl;

  luaL_register:     procedure(L: lua_State; libname: PAnsiChar; lr: PluaL_reg); cdecl;
  luaL_getmetafield: function(L: lua_State; obj: Integer; e: PAnsiChar): Integer; cdecl;
  luaL_callmeta:     function(L: lua_State; obj: Integer; e: PAnsiChar): Integer; cdecl;
  luaL_typerror:     function(L: lua_State; narg: Integer; tname: PAnsiChar): Integer; cdecl;
  luaL_argerror:     function(L: lua_State; narg: Integer; extramsg: PAnsiChar): Integer; cdecl;
  luaL_checklstring: function(L: lua_State; narg: Integer; var len: Cardinal): PAnsiChar; cdecl;
  luaL_optlstring:   function(L: lua_State; narg: Integer; d: PAnsiChar; var len: Cardinal): PAnsiChar; cdecl;
  luaL_checknumber:  function(L: lua_State; narg: Integer): lua_Number; cdecl;
  luaL_optnumber:    function(L: lua_State; narg: Integer; d: lua_Number): lua_Number; cdecl;

  luaL_checkinteger: function(L: lua_State; narg: Integer): lua_Integer; cdecl;
  luaL_optinteger:   function(L: lua_State; narg: Integer; d: lua_Integer): lua_Integer; cdecl;

  luaL_checkstack: procedure(L: lua_State; sz: Integer; msg: PAnsiChar); cdecl;
  luaL_checktype:  procedure(L: lua_State; narg, t: Integer); cdecl;
  luaL_checkany:   procedure(L: lua_State; narg: Integer); cdecl;

  luaL_newmetatable: function(L: lua_State; tname: PAnsiChar): Integer; cdecl;
  luaL_checkudata:   function(L: lua_State; narg: Integer; tname: PAnsiChar): Pointer; cdecl;

  luaL_checkoption: function(L: lua_State; narg: Integer; def: PAnsiChar; lst: array of PAnsiChar): Integer; cdecl;

  luaL_where: procedure(L: lua_State; lvl: Integer); cdecl;
  luaL_error: function(L: lua_State; fmt: PAnsiChar; args: array of const): Integer; cdecl;

  luaL_ref:   function(L: lua_State; t: Integer): Integer; cdecl;
  luaL_unref: procedure(L: lua_State; t, ref: Integer); cdecl;

{$ifdef LUA_COMPAT_GETN}
  luaL_getn: function(L: lua_State; t: Integer): Integer; cdecl;
  luaL_setn: procedure(L: lua_State; t, n: Integer); cdecl;
{$endif}

  luaL_loadfile:   function(L: lua_State; filename: PAnsiChar): Integer; cdecl;
  luaL_loadbuffer: function(L: lua_State; buff: PAnsiChar; sz: Cardinal; name: PAnsiChar): Integer; cdecl;
  luaL_loadstring: function(L: lua_State; s: PAnsiChar): Integer; cdecl;

  luaL_newstate:  function(): lua_State; cdecl;
  luaL_gsub:      function(L: lua_State; s, p, r: PAnsiChar): PAnsiChar; cdecl;
  luaL_findtable: function(L: lua_State; idx: Integer; fname: PAnsiChar; szhint: Integer): PAnsiChar; cdecl;

  luaL_buffinit:   procedure(L: lua_State; var B: luaL_Buffer); cdecl;
  luaL_prepbuffer: function(var B: luaL_Buffer): PAnsiChar; cdecl;
  luaL_addlstring: procedure(var B: luaL_Buffer; s: PAnsiChar; l: Cardinal); cdecl;
  luaL_addstring:  procedure(var B: luaL_Buffer; s: PAnsiChar); cdecl;
  luaL_addvalue:   procedure(var B: luaL_Buffer); cdecl;
  luaL_pushresult: procedure(var B: luaL_Buffer); cdecl;

  (*
  ** ===============================================================
  ** some useful macros
  ** ===============================================================
  *)

{$ifndef LUA_COMPAT_GETN}
  function  luaL_getn(L: lua_State; t: Integer): Integer;
  procedure luaL_setn(L: lua_State; t, n: Integer); 
{$endif}

  (* pseudo-indices *)
  function lua_upvalueindex(i: Integer): Integer;

  (* to help testing the libraries *)
  procedure lua_assert(c: Boolean);

  function lua_number2str(s: Lua_Number; n: Integer): String;
  function lua_str2number(s: String; p: integer): Lua_Number;

  (* argument and parameters checks *)
  function luaL_argcheck(L: lua_State; cond: Boolean; narg: Integer; extramsg: PAnsiChar): Integer;
  function luaL_checkstring(L: lua_State; narg: Integer): PAnsiChar;
  function luaL_optstring(L: lua_State; narg: Integer; d: PAnsiChar): PAnsiChar;
  function luaL_checkint(L: lua_State; narg: Integer): Integer;
  function luaL_optint(L: lua_State; narg, d: Integer): Integer;
  function luaL_checklong(L: lua_State; narg: Integer): LongInt;
  function luaL_optlong(L: lua_State; narg: Integer; d: LongInt): LongInt;

  function luaL_typename(L: lua_State; idx: Integer): PAnsiChar;
  function luaL_dofile(L: lua_State; filename: PAnsiChar): Integer;
  function luaL_dostring(L: lua_State; str: PAnsiChar): Integer;

  procedure luaL_getmetatable(L: lua_State; tname: PAnsiChar);

  (* Generic Buffer manipulation *)
  procedure luaL_addchar(var B: luaL_Buffer; c: AnsiChar);
  procedure luaL_putchar(var B: luaL_Buffer; c: AnsiChar);
  procedure luaL_addsize(var B: luaL_Buffer; n: Cardinal);

  function luaL_check_lstr(L: lua_State; numArg: Integer; var ls: Cardinal): PAnsiChar;
  function luaL_opt_lstr(L: lua_State; numArg: Integer; def: PAnsiChar; var ls: Cardinal): PAnsiChar;
  function luaL_check_number(L: lua_State; numArg: Integer): lua_Number;
  function luaL_opt_number(L: lua_State; nArg: Integer; def: lua_Number): lua_Number;
  function luaL_arg_check(L: lua_State; cond: Boolean; numarg: Integer; extramsg: PAnsiChar): Integer;
  function luaL_check_string(L: lua_State; n: Integer): PAnsiChar;
  function luaL_opt_string(L: lua_State; n: Integer; d: PAnsiChar): PAnsiChar;
  function luaL_check_int(L: lua_State; n: Integer): Integer;
  function luaL_check_long(L: lua_State; n: LongInt): LongInt;
  function luaL_opt_int(L: lua_State; n, d: Integer): Integer;
  function luaL_opt_long(L: lua_State; n: Integer; d: LongInt): LongInt;

  procedure lua_pop(L: lua_State; n: Integer);
  procedure lua_newtable(L: lua_State);
  procedure lua_register(L: lua_state; name: PAnsiChar; f: lua_CFunction);
  procedure lua_pushcfunction(L: lua_State; f: lua_CFunction);
  function  lua_strlen(L: lua_State; i: Integer): Cardinal;

  function lua_isfunction(L: lua_State; idx: Integer): Boolean;
  function lua_istable(L: lua_State; idx: Integer): Boolean;
  function lua_islightuserdata(L: lua_State; idx: Integer): Boolean;
  function lua_isnil(L: lua_State; idx: Integer): Boolean;
  function lua_isboolean(L: lua_State; idx: Integer): Boolean;
  function lua_isthread(L: lua_State; idx: Integer): Boolean;
  function lua_isnone(L: lua_State; idx: Integer): Boolean;
  function lua_isnoneornil(L: lua_State; idx: Integer): Boolean;

  procedure lua_pushliteral(L: lua_State; s: PAnsiChar);
  procedure lua_setglobal(L: lua_State; name: PAnsiChar);
  procedure lua_getglobal(L: lua_State; name: PAnsiChar);
  function  lua_tostring(L: lua_State; idx: Integer): PAnsiChar;

  (*
  ** compatibility macros and functions
  *)

  function  lua_open(): lua_State;
  procedure lua_getregistry(L: lua_State);
  function  lua_getgccount(L: lua_State): Integer;

  (* compatibility with ref system *)
  function  lua_ref(L: lua_State; lock: Boolean): Integer;
  procedure lua_unref(L: lua_State; ref: Integer);
  procedure lua_getref(L: lua_State; ref: Integer);

  (*
  ** Dynamic library manipulation
  *)
  function  GetProcAddr( fHandle: THandle; const methodName: String; bErrorIfNotExists: Boolean = True ): Pointer;
  procedure SetLuaLibFileName( newLuaLibFileName: String );
  function  GetLuaLibFileName(): String;
  function  LoadLuaLib( newLuaLibFileName: String = '' ): Integer;
  procedure FreeLuaLib();
  function LuaLibLoaded: Boolean;

implementation

uses
  SysUtils, Math,
{$ifdef MSWINDOWS}
  Windows
{$endif}
;

var
  fLibHandle: Integer = 0;
{$ifdef MSWINDOWS}
  fLuaLibFileName: String = 'Lua5.1.dll';
{$endif}
{$ifdef LINUX}
  fLuaLibFileName: String = 'liblua.so.5.1';
{$endif}

(*
** Dynamic library manipulation
*)

function GetProcAddr( fHandle: THandle; const methodName: String; bErrorIfNotExists: Boolean = True ): Pointer;
begin
  Result := GetProcAddress( fHandle, PAnsiChar( AnsiString(methodName) ) );

  if bErrorIfNotExists and ( Result = nil ) then
     Raise Exception.Create( 'Cannot load method ' + QuotedStr( methodName ) + ' from dynamic library.' );
end;

procedure SetLuaLibFileName( newLuaLibFileName: String );
begin
  fLuaLibFileName := newLuaLibFileName;
end;

function GetLuaLibFileName(): String;
begin
  Result := fLuaLibFileName;
end;

function LuaLibLoaded: Boolean;
begin
   Result := fLibHandle <> 0;
end;



function LoadLuaLib(newLuaLibFileName: String): Integer;
begin
  FreeLuaLib();

  if newLuaLibFileName <> '' then
     SetLuaLibFileName( newLuaLibFileName );

  if not FileExists( GetLuaLibFileName() ) then begin
     Result := -1;
     exit;
  end;

  fLibHandle := LoadLibrary(PWideChar( (GetLuaLibFileName() ) ));

  if fLibHandle = 0 then begin
     Result := -2;
     exit;
  end;

  lua_newstate       := GetProcAddr( fLibHandle, 'lua_newstate' );
  lua_close          := GetProcAddr( fLibHandle, 'lua_close' );
  lua_newthread      := GetProcAddr( fLibHandle, 'lua_newthread' );
  lua_atpanic        := GetProcAddr( fLibHandle, 'lua_atpanic' );
  lua_gettop         := GetProcAddr( fLibHandle, 'lua_gettop' );
  lua_settop         := GetProcAddr( fLibHandle, 'lua_settop' );
  lua_pushvalue      := GetProcAddr( fLibHandle, 'lua_pushvalue' );
  lua_remove         := GetProcAddr( fLibHandle, 'lua_remove' );
  lua_insert         := GetProcAddr( fLibHandle, 'lua_insert' );
  lua_replace        := GetProcAddr( fLibHandle, 'lua_replace' );
  lua_checkstack     := GetProcAddr( fLibHandle, 'lua_checkstack' );
  lua_xmove          := GetProcAddr( fLibHandle, 'lua_xmove' );
  lua_isnumber       := GetProcAddr( fLibHandle, 'lua_isnumber' );
  lua_isstring       := GetProcAddr( fLibHandle, 'lua_isstring' );
  lua_iscfunction    := GetProcAddr( fLibHandle, 'lua_iscfunction' );
  lua_isuserdata     := GetProcAddr( fLibHandle, 'lua_isuserdata' );
  lua_type           := GetProcAddr( fLibHandle, 'lua_type' );
  lua_typename       := GetProcAddr( fLibHandle, 'lua_typename' );
  lua_equal          := GetProcAddr( fLibHandle, 'lua_equal' );
  lua_rawequal       := GetProcAddr( fLibHandle, 'lua_rawequal' );
  lua_lessthan       := GetProcAddr( fLibHandle, 'lua_lessthan' );
  lua_tonumber       := GetProcAddr( fLibHandle, 'lua_tonumber' );
  lua_tointeger      := GetProcAddr( fLibHandle, 'lua_tointeger' );
  lua_toboolean      := GetProcAddr( fLibHandle, 'lua_toboolean' );
  lua_tolstring      := GetProcAddr( fLibHandle, 'lua_tolstring' );
  lua_objlen         := GetProcAddr( fLibHandle, 'lua_objlen' );
  lua_tocfunction    := GetProcAddr( fLibHandle, 'lua_tocfunction' );
  lua_touserdata     := GetProcAddr( fLibHandle, 'lua_touserdata' );
  lua_tothread       := GetProcAddr( fLibHandle, 'lua_tothread' );
  lua_topointer      := GetProcAddr( fLibHandle, 'lua_topointer' );
  lua_pushnil        := GetProcAddr( fLibHandle, 'lua_pushnil' );
  lua_pushnumber     := GetProcAddr( fLibHandle, 'lua_pushnumber' );
  lua_pushinteger    := GetProcAddr( fLibHandle, 'lua_pushinteger' );
  lua_pushlstring    := GetProcAddr( fLibHandle, 'lua_pushlstring' );
  lua_pushstring     := GetProcAddr( fLibHandle, 'lua_pushstring' );
  lua_pushvfstring   := GetProcAddr( fLibHandle, 'lua_pushvfstring' );
  lua_pushfstring    := GetProcAddr( fLibHandle, 'lua_pushfstring' );
  lua_pushcclosure   := GetProcAddr( fLibHandle, 'lua_pushcclosure' );
  lua_pushboolean    := GetProcAddr( fLibHandle, 'lua_pushboolean' );
  lua_pushlightuserdata := GetProcAddr( fLibHandle, 'lua_pushlightuserdata' );
  lua_pushthread     := GetProcAddr( fLibHandle, 'lua_pushthread' );
  lua_gettable       := GetProcAddr( fLibHandle, 'lua_gettable' );
  lua_getfield       := GetProcAddr( fLibHandle, 'lua_getfield' );
  lua_rawget         := GetProcAddr( fLibHandle, 'lua_rawget' );
  lua_rawgeti        := GetProcAddr( fLibHandle, 'lua_rawgeti' );
  lua_createtable    := GetProcAddr( fLibHandle, 'lua_createtable' );
  lua_newuserdata    := GetProcAddr( fLibHandle, 'lua_newuserdata' );
  lua_getmetatable   := GetProcAddr( fLibHandle, 'lua_getmetatable' );
  lua_getfenv        := GetProcAddr( fLibHandle, 'lua_getfenv' );
  lua_settable       := GetProcAddr( fLibHandle, 'lua_settable' );
  lua_setfield       := GetProcAddr( fLibHandle, 'lua_setfield' );
  lua_rawset         := GetProcAddr( fLibHandle, 'lua_rawset' );
  lua_rawseti        := GetProcAddr( fLibHandle, 'lua_rawseti' );
  lua_setmetatable   := GetProcAddr( fLibHandle, 'lua_setmetatable' );
  lua_setfenv        := GetProcAddr( fLibHandle, 'lua_setfenv' );
  lua_call           := GetProcAddr( fLibHandle, 'lua_call' );
  lua_pcall          := GetProcAddr( fLibHandle, 'lua_pcall' );
  lua_cpcall         := GetProcAddr( fLibHandle, 'lua_cpcall' );
  lua_load           := GetProcAddr( fLibHandle, 'lua_load' );
  lua_dump           := GetProcAddr( fLibHandle, 'lua_dump' );
  lua_yield          := GetProcAddr( fLibHandle, 'lua_yield' );
  lua_resume         := GetProcAddr( fLibHandle, 'lua_resume' );
  lua_status         := GetProcAddr( fLibHandle, 'lua_status' );
  lua_gc             := GetProcAddr( fLibHandle, 'lua_gc' );
  lua_error          := GetProcAddr( fLibHandle, 'lua_error' );
  lua_next           := GetProcAddr( fLibHandle, 'lua_next' );
  lua_concat         := GetProcAddr( fLibHandle, 'lua_concat' );
  lua_getallocf      := GetProcAddr( fLibHandle, 'lua_getallocf' );
  lua_setallocf      := GetProcAddr( fLibHandle, 'lua_setallocf' );
  lua_getstack       := GetProcAddr( fLibHandle, 'lua_getstack' );
  lua_getinfo        := GetProcAddr( fLibHandle, 'lua_getinfo' );
  lua_getlocal       := GetProcAddr( fLibHandle, 'lua_getlocal' );
  lua_setlocal       := GetProcAddr( fLibHandle, 'lua_setlocal' );
  lua_getupvalue     := GetProcAddr( fLibHandle, 'lua_getupvalue' );
  lua_setupvalue     := GetProcAddr( fLibHandle, 'lua_setupvalue' );
  lua_sethook        := GetProcAddr( fLibHandle, 'lua_sethook' );
  lua_gethook        := GetProcAddr( fLibHandle, 'lua_gethook' );
  lua_gethookmask    := GetProcAddr( fLibHandle, 'lua_gethookmask' );
  lua_gethookcount   := GetProcAddr( fLibHandle, 'lua_gethookcount' );
  luaopen_base       := GetProcAddr( fLibHandle, 'luaopen_base' );
  luaopen_table      := GetProcAddr( fLibHandle, 'luaopen_table' );
  luaopen_io         := GetProcAddr( fLibHandle, 'luaopen_io' );
  luaopen_os         := GetProcAddr( fLibHandle, 'luaopen_os' );
  luaopen_string     := GetProcAddr( fLibHandle, 'luaopen_string' );
  luaopen_math       := GetProcAddr( fLibHandle, 'luaopen_math' );
  luaopen_debug      := GetProcAddr( fLibHandle, 'luaopen_debug' );
  luaopen_package    := GetProcAddr( fLibHandle, 'luaopen_package' );
  luaL_openlibs      := GetProcAddr( fLibHandle, 'luaL_openlibs' );
  luaL_register      := GetProcAddr( fLibHandle, 'luaL_register' );
  luaL_getmetafield  := GetProcAddr( fLibHandle, 'luaL_getmetafield' );
  luaL_callmeta      := GetProcAddr( fLibHandle, 'luaL_callmeta' );
  luaL_typerror      := GetProcAddr( fLibHandle, 'luaL_typerror' );
  luaL_argerror      := GetProcAddr( fLibHandle, 'luaL_argerror' );
  luaL_checklstring  := GetProcAddr( fLibHandle, 'luaL_checklstring' );
  luaL_optlstring    := GetProcAddr( fLibHandle, 'luaL_optlstring' );
  luaL_checknumber   := GetProcAddr( fLibHandle, 'luaL_checknumber' );
  luaL_optnumber     := GetProcAddr( fLibHandle, 'luaL_optnumber' );
  luaL_checkinteger  := GetProcAddr( fLibHandle, 'luaL_checkinteger' );
  luaL_optinteger    := GetProcAddr( fLibHandle, 'luaL_optinteger' );
  luaL_checkstack    := GetProcAddr( fLibHandle, 'luaL_checkstack' );
  luaL_checktype     := GetProcAddr( fLibHandle, 'luaL_checktype' );
  luaL_checkany      := GetProcAddr( fLibHandle, 'luaL_checkany' );
  luaL_newmetatable  := GetProcAddr( fLibHandle, 'luaL_newmetatable' );
  luaL_checkudata    := GetProcAddr( fLibHandle, 'luaL_checkudata' );
  luaL_where         := GetProcAddr( fLibHandle, 'luaL_where' );
  luaL_error         := GetProcAddr( fLibHandle, 'luaL_error' );
  luaL_checkoption   := GetProcAddr( fLibHandle, 'luaL_checkoption' );
  luaL_ref           := GetProcAddr( fLibHandle, 'luaL_ref' );
  luaL_unref         := GetProcAddr( fLibHandle, 'luaL_unref' );
{$ifdef LUA_COMPAT_GETN}
  luaL_getn          := GetProcAddr( fLibHandle, 'luaL_getn' );
  luaL_setn          := GetProcAddr( fLibHandle, 'luaL_setn' );
{$endif}
  luaL_loadfile      := GetProcAddr( fLibHandle, 'luaL_loadfile' );
  luaL_loadbuffer    := GetProcAddr( fLibHandle, 'luaL_loadbuffer' );
  luaL_loadstring    := GetProcAddr( fLibHandle, 'luaL_loadstring' );
  luaL_newstate      := GetProcAddr( fLibHandle, 'luaL_newstate' );
  luaL_gsub          := GetProcAddr( fLibHandle, 'luaL_gsub' );
  luaL_findtable     := GetProcAddr( fLibHandle, 'luaL_findtable' );
  luaL_buffinit      := GetProcAddr( fLibHandle, 'luaL_buffinit' );
  luaL_prepbuffer    := GetProcAddr( fLibHandle, 'luaL_prepbuffer' );
  luaL_addlstring    := GetProcAddr( fLibHandle, 'luaL_addlstring' );
  luaL_addstring     := GetProcAddr( fLibHandle, 'luaL_addstring' );
  luaL_addvalue      := GetProcAddr( fLibHandle, 'luaL_addvalue' );
  luaL_pushresult    := GetProcAddr( fLibHandle, 'luaL_pushresult' );

  Result := fLibHandle;
end;

procedure FreeLuaLib();
begin
  lua_newstate       := nil;
  lua_close          := nil;
  lua_newthread      := nil;
  lua_atpanic        := nil;
  lua_gettop         := nil;
  lua_settop         := nil;
  lua_pushvalue      := nil;
  lua_remove         := nil;
  lua_insert         := nil;
  lua_replace        := nil;
  lua_checkstack     := nil;
  lua_xmove          := nil;
  lua_isnumber       := nil;
  lua_isstring       := nil;
  lua_iscfunction    := nil;
  lua_isuserdata     := nil;
  lua_type           := nil;
  lua_typename       := nil;
  lua_equal          := nil;
  lua_rawequal       := nil;
  lua_lessthan       := nil;
  lua_tonumber       := nil;
  lua_tointeger      := nil;
  lua_toboolean      := nil;
  lua_tolstring      := nil;
  lua_objlen         := nil;
  lua_tocfunction    := nil;
  lua_touserdata     := nil;
  lua_tothread       := nil;
  lua_topointer      := nil;
  lua_pushnil        := nil;
  lua_pushnumber     := nil;
  lua_pushinteger    := nil;
  lua_pushlstring    := nil;
  lua_pushstring     := nil;
  lua_pushvfstring   := nil;
  lua_pushfstring    := nil;
  lua_pushcclosure   := nil;
  lua_pushboolean    := nil;
  lua_pushlightuserdata := nil;
  lua_pushthread     := nil;
  lua_gettable       := nil;
  lua_getfield       := nil;
  lua_rawget         := nil;
  lua_rawgeti        := nil;
  lua_createtable    := nil;
  lua_newuserdata    := nil;
  lua_getmetatable   := nil;
  lua_getfenv        := nil;
  lua_settable       := nil;
  lua_setfield       := nil;
  lua_rawset         := nil;
  lua_rawseti        := nil;
  lua_setmetatable   := nil;
  lua_setfenv        := nil;
  lua_call           := nil;
  lua_pcall          := nil;
  lua_cpcall         := nil;
  lua_load           := nil;
  lua_dump           := nil;
  lua_yield          := nil;
  lua_resume         := nil;
  lua_status         := nil;
  lua_gc             := nil;
  lua_error          := nil;
  lua_next           := nil;
  lua_concat         := nil;
  lua_getallocf      := nil;
  lua_setallocf      := nil;
  lua_getstack       := nil;
  lua_getinfo        := nil;
  lua_getlocal       := nil;
  lua_setlocal       := nil;
  lua_getupvalue     := nil;
  lua_setupvalue     := nil;
  lua_sethook        := nil;
  lua_gethook        := nil;
  lua_gethookmask    := nil;
  lua_gethookcount   := nil;
  luaopen_base       := nil;
  luaopen_table      := nil;
  luaopen_io         := nil;
  luaopen_os         := nil;
  luaopen_string     := nil;
  luaopen_math       := nil;
  luaopen_debug      := nil;
  luaopen_package    := nil;
  luaL_openlibs      := nil;
  luaL_register      := nil;
  luaL_getmetafield  := nil;
  luaL_callmeta      := nil;
  luaL_typerror      := nil;
  luaL_argerror      := nil;
  luaL_checklstring  := nil;
  luaL_optlstring    := nil;
  luaL_checknumber   := nil;
  luaL_optnumber     := nil;
  luaL_checkinteger  := nil;
  luaL_optinteger    := nil;
  luaL_checkstack    := nil;
  luaL_checktype     := nil;
  luaL_checkany      := nil;
  luaL_newmetatable  := nil;
  luaL_checkudata    := nil;
  luaL_where         := nil;
  luaL_error         := nil;
  luaL_checkoption   := nil;
  luaL_ref           := nil;
  luaL_unref         := nil;
{$ifdef LUA_COMPAT_GETN}
  luaL_getn          := nil;
  luaL_setn          := nil;
{$endif}
  luaL_loadfile      := nil;
  luaL_loadbuffer    := nil;
  luaL_loadstring    := nil;
  luaL_newstate      := nil;
  luaL_gsub          := nil;
  luaL_findtable     := nil;
  luaL_buffinit      := nil;
  luaL_prepbuffer    := nil;
  luaL_addlstring    := nil;
  luaL_addstring     := nil;
  luaL_addvalue      := nil;
  luaL_pushresult    := nil;

  if fLibHandle <> 0 then begin
     FreeLibrary( fLibHandle );
     fLibHandle := 0;
  end;
end;

{$ifndef LUA_COMPAT_GETN}
function luaL_getn(L: lua_State; t: Integer): Integer;
begin
  Result := lua_objlen(L, t);
end;

procedure luaL_setn(L: lua_State; t, n: Integer);
begin
end;
{$endif}

function lua_upvalueindex(i: Integer): Integer;
begin
  Result := LUA_GLOBALSINDEX - i;
end;

procedure lua_pop(L: lua_State; n: Integer);
begin
  lua_settop(L, -(n) - 1);
end;

procedure lua_newtable(L: lua_State);
begin
  lua_createtable(L, 0, 0);
end;

function lua_strlen(L: lua_State; i: Integer): Cardinal;
begin
  result := lua_objlen(L, i);
end;

procedure lua_register(L: lua_state; name: PAnsiChar; f: lua_CFunction);
begin
  lua_pushcfunction(L, f);
  lua_setglobal(L, name);
end;

procedure lua_pushcfunction(L: lua_State; f: lua_CFunction);
begin
  lua_pushcclosure(L, f, 0);
end;

function lua_isfunction(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TFUNCTION;
end;

function lua_istable(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TTABLE;
end;

function lua_islightuserdata(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TLIGHTUSERDATA;
end;

function lua_isnil(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TNIL;
end;

function lua_isboolean(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TBOOLEAN;
end;

function lua_isthread(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TTHREAD;
end;

function lua_isnone(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) = LUA_TNONE;
end;

function lua_isnoneornil(L: lua_State; idx: Integer): Boolean;
begin
  Result := lua_type(L, idx) <= 0;
end;

procedure lua_pushliteral(L: lua_State; s: PAnsiChar);
begin
  lua_pushlstring(L, s, StrLen(s));
end;

procedure lua_setglobal(L: lua_State; name: PAnsiChar);
begin
  lua_setfield(L, LUA_GLOBALSINDEX, name);
end;

procedure lua_getglobal(L: lua_State; name: PAnsiChar);
begin
  lua_getfield(L, LUA_GLOBALSINDEX, name);
end;

function lua_tostring(L: lua_State; idx: Integer): PAnsiChar;
var
  len: Cardinal;
begin
  Result := lua_tolstring(L, idx, len);
end;

function lua_getgccount(L: lua_State): Integer;
begin
  Result := lua_gc(L, LUA_GCCOUNT, 0);
end;

function lua_open(): lua_State;
begin
  Result := luaL_newstate();
end;

procedure lua_getregistry(L: lua_State);
begin
  lua_pushvalue(L, LUA_REGISTRYINDEX);
end;

function lua_ref(L: lua_State; lock: Boolean): Integer;
begin
  if lock then
     Result := luaL_ref(L, LUA_REGISTRYINDEX)
  else begin
     lua_pushstring(L, 'unlocked references are obsolete');
     Result := lua_error(L);
  end;
end;

procedure lua_unref(L: lua_State; ref: Integer);
begin
  luaL_unref(L, LUA_REGISTRYINDEX, ref);
end;

procedure lua_getref(L: lua_State; ref: Integer);
begin
  lua_rawgeti(L, LUA_REGISTRYINDEX, ref);
end;

procedure lua_assert(c: Boolean);
begin
end;

function lua_number2str(s: Lua_Number; n: Integer): String;
begin
  Result := FormatFloat( LUA_NUMBER_FMT, RoundTo( s, n ) );
end;

function lua_str2number(s: String; p: integer): Lua_Number;
begin
  Result := RoundTo( StrToFloat( s ), p );
end;

function luaL_argcheck(L: lua_State; cond: Boolean; narg: Integer; extramsg: PAnsiChar): Integer;
begin
  if cond then
     Result := 0
  else
     Result := luaL_argerror(L, narg, extramsg);
end;

function luaL_checkstring(L: lua_State; narg: Integer): PAnsiChar;
var
  ls: Cardinal;
begin
  Result := luaL_checklstring(L, narg, ls);
end;

function luaL_optstring(L: lua_State; narg: Integer; d: PAnsiChar): PAnsiChar;
var
  ls: Cardinal;
begin
  Result := luaL_optlstring(L, narg, d, ls);
end;

function luaL_checkint(L: lua_State; narg: Integer): Integer;
begin
  Result := Trunc(luaL_checkinteger(L, narg));
end;

function luaL_optint(L: lua_State; narg, d: Integer): Integer;
begin
  Result := Trunc(luaL_optinteger(L, narg, d));
end;

function luaL_checklong(L: lua_State; narg: Integer): LongInt;
begin
  Result := Trunc(luaL_checkinteger(L, narg));
end;

function luaL_optlong(L: lua_State; narg: Integer; d: LongInt): LongInt;
begin
  Result := Trunc(luaL_optinteger(L, narg, d));
end;

function luaL_typename(L: lua_State; idx: Integer): PAnsiChar;
begin
  Result := lua_typename(L, lua_type(L, idx));
end;

function luaL_dofile(L: lua_State; filename: PAnsiChar): Integer;
begin
  Result := luaL_loadfile(L, filename);

  If Result = 0 Then
     Result := lua_pcall(L, 0, LUA_MULTRET, 0);
end;

function luaL_dostring(L: lua_State; str: PAnsiChar): Integer;
begin
  Result := luaL_loadstring(L, str);
  
  If Result = 0 Then
     Result := lua_pcall(L, 0, LUA_MULTRET, 0);
end;

procedure luaL_getmetatable(L: lua_State; tname: PAnsiChar);
begin
   lua_getfield(L, LUA_REGISTRYINDEX, tname);
end;

procedure luaL_addchar(var B: luaL_Buffer; c: AnsiChar);
begin
  if Integer(B.p) < Integer(B.buffer + LUAL_BUFFERSIZE) then
     luaL_prepbuffer(B);

  B.p^ := c;
  Inc(B.p);
{  // original C code
#define luaL_addchar(B,c) \
  ((void)((B)->p < ((B)->buffer+LUAL_BUFFERSIZE) || luaL_prepbuffer(B)), \
   (*(B)->p++ = (char)(c)))
}
end;

procedure luaL_putchar(var B: luaL_Buffer; c: AnsiChar);
begin
  luaL_addchar(B, c);
end;

procedure luaL_addsize(var B: luaL_Buffer; n: Cardinal);
begin
  Inc(B.p, n);
end;

function luaL_check_lstr(L: lua_State; numArg: Integer; var ls: Cardinal): PAnsiChar;
begin
  Result := luaL_checklstring(L, numArg, ls);
end;

function luaL_opt_lstr(L: lua_State; numArg: Integer; def: PAnsiChar; var ls: Cardinal): PAnsiChar;
begin
  Result := luaL_optlstring(L, numArg, def, ls);
end;

function luaL_check_number(L: lua_State; numArg: Integer): lua_Number;
begin
  Result := luaL_checknumber(L, numArg);
end;

function luaL_opt_number(L: lua_State; nArg: Integer; def: lua_Number): lua_Number;
begin
  Result := luaL_optnumber(L, nArg, def);
end;

function luaL_arg_check(L: lua_State; cond: Boolean; numarg: Integer; extramsg: PAnsiChar): Integer;
begin
  Result := luaL_argcheck(L, cond, numarg, extramsg);
end;

function luaL_check_string(L: lua_State; n: Integer): PAnsiChar;
begin
  Result := luaL_checkstring(L, n);
end;

function luaL_opt_string(L: lua_State; n: Integer; d: PAnsiChar): PAnsiChar;
begin
  Result := luaL_optstring(L, n, d);
end;

function luaL_check_int(L: lua_State; n: Integer): Integer;
begin
  Result := luaL_checkint(L, n);
end;

function luaL_check_long(L: lua_State; n: LongInt): LongInt;
begin
  Result := luaL_checklong(L, n);
end;

function luaL_opt_int(L: lua_State; n, d: Integer): Integer;
begin
  Result := luaL_optint(L, n, d);
end;

function luaL_opt_long(L: lua_State; n: Integer; d: LongInt): LongInt;
begin
  Result := luaL_optlong(L, n, d);
end;

end.