unit ULua;

(*
 * A complete Pascal wrapper for Lua 5.1 DLL module.
 *
 * Created by Geo Massar, 2006
 * Distributed as free/open source.
 *)

interface

{$IFDEF FPC}
  {$MODE Delphi}
{$ENDIF}

{$IFDEF UNIX}
uses
  dl,
  UConfig;
{$ENDIF}

{$DEFINE LUA51}

type
  size_t   = type Cardinal;
  Psize_t  = ^size_t;
  PPointer = ^Pointer;

  lua_State = record end;
  Plua_State = ^lua_State;

const
{$IFDEF WIN32}
  LuaDLL = 'lua5.1.dll';
{$ENDIF}
{$IFDEF UNIX}
{$IFDEF DARWIN}
  LuaDLL = 'liblua.5.1.dylib';
  {$linklib liblua.5.1}
{$ELSE}
  LuaDLL = lua_lib_name;
{$ENDIF}
{$ENDIF}
{$IFDEF MACOS}
  SDLgfxLibName = 'lua5.1';
{$ENDIF}

(* formats for Lua numbers *)
{$IFNDEF LUA_NUMBER_SCAN}
const
  LUA_NUMBER_SCAN = '%lf';
{$ENDIF}

{$IFNDEF LUA_NUMBER_FMT}
const
  LUA_NUMBER_FMT = '%.14g';
{$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 Integer;

(*
@@ 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 : Integer);
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 : Integer) : Integer;   // 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) : Integer; 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) : Integer; 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) : Integer;
  cdecl; external LuaDLL;
procedure lua_settop(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_pushvalue(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_remove(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_insert(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_replace(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
function  lua_checkstack(L : Plua_State; sz : Integer) : LongBool;
  cdecl; external LuaDLL;

procedure lua_xmove(src, dest : Plua_State; n : Integer);
  cdecl; external LuaDLL;


(*
** access functions (stack -> C)
*)
function lua_isnumber(L : Plua_State; idx : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_isstring(L : Plua_State; idx : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_iscfunction(L : Plua_State; idx : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_isuserdata(L : Plua_State; idx : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_type(L : Plua_State; idx : Integer) : Integer;
  cdecl; external LuaDLL;
function lua_typename(L : Plua_State; tp : Integer) : PChar;
  cdecl; external LuaDLL;

function lua_equal(L : Plua_State; idx1, idx2 : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_rawequal(L : Plua_State; idx1, idx2 : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_lessthan(L : Plua_State; idx1, idx2 : Integer) : LongBool;
  cdecl; external LuaDLL;

function lua_tonumber(L : Plua_State; idx : Integer) : lua_Number;
  cdecl; external LuaDLL;
function lua_tointeger(L : Plua_State; idx : Integer) : lua_Integer;
  cdecl; external LuaDLL;
function lua_toboolean(L : Plua_State; idx : Integer) : LongBool;
  cdecl; external LuaDLL;
function lua_tolstring(L : Plua_State; idx : Integer;
                       len : Psize_t) : PChar;
  cdecl; external LuaDLL;
function lua_objlen(L : Plua_State; idx : Integer) : size_t;
  cdecl; external LuaDLL;
function lua_tocfunction(L : Plua_State; idx : Integer) : lua_CFunction;
  cdecl; external LuaDLL;
function lua_touserdata(L : Plua_State; idx : Integer) : Pointer;
  cdecl; external LuaDLL;
function lua_tothread(L : Plua_State; idx : Integer) : Plua_State;
  cdecl; external LuaDLL;
function lua_topointer(L : Plua_State; idx : Integer) : 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 : Integer);
  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 : Integer);
  cdecl; external LuaDLL;
procedure lua_getfield(L : Plua_State; idx : Integer; k : PChar);
  cdecl; external LuaDLL;
procedure lua_rawget(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_rawgeti(L : Plua_State; idx, n : Integer);
  cdecl; external LuaDLL;
procedure lua_createtable(L : Plua_State; narr, nrec : Integer);
  cdecl; external LuaDLL;
function  lua_newuserdata(L : Plua_State; sz : size_t) : Pointer;
  cdecl; external LuaDLL;
function  lua_getmetatable(L : Plua_State; objindex : Integer) : LongBool;
  cdecl; external LuaDLL;
procedure lua_getfenv(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;


(*
** set functions (stack -> Lua)
*)
procedure lua_settable(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_setfield(L : Plua_State; idx : Integer; const k : PChar);
  cdecl; external LuaDLL;
procedure lua_rawset(L : Plua_State; idx : Integer);
  cdecl; external LuaDLL;
procedure lua_rawseti(L : Plua_State; idx , n: Integer);
  cdecl; external LuaDLL;
function lua_setmetatable(L : Plua_State; objindex : Integer): LongBool;
  cdecl; external LuaDLL;
function lua_setfenv(L : Plua_State; idx : Integer): LongBool;
  cdecl; external LuaDLL;

(*
** `load' and `call' functions (load and run Lua code)
*)
procedure lua_call(L : Plua_State; nargs, nresults : Integer);
  cdecl; external LuaDLL;
function  lua_pcall(L : Plua_State;
                    nargs, nresults, errfunc : Integer) : Integer;
  cdecl; external LuaDLL;
function  lua_cpcall(L : Plua_State;
                     func : lua_CFunction; ud : Pointer) : Integer;
  cdecl; external LuaDLL;
function  lua_load(L : Plua_State; reader : lua_Reader;
                   dt : Pointer; const chunkname : PChar) : Integer;
  cdecl; external LuaDLL;

function lua_dump(L : Plua_State; writer : lua_Writer; data: Pointer) : Integer;
  cdecl; external LuaDLL;


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

(*
** miscellaneous functions
*)
function lua_error(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function lua_next(L : Plua_State; idx : Integer) : Integer;
  cdecl; external LuaDLL;

procedure lua_concat(L : Plua_State; n : Integer);
  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 : Integer);

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 : Integer) : Integer;

function lua_isfunction(L : Plua_State; n : Integer) : Boolean;
function lua_istable(L : Plua_State; n : Integer) : Boolean;
function lua_islightuserdata(L : Plua_State; n : Integer) : Boolean;
function lua_isnil(L : Plua_State; n : Integer) : Boolean;
function lua_isboolean(L : Plua_State; n : Integer) : Boolean;
function lua_isthread(L : Plua_State; n : Integer) : Boolean;
function lua_isnone(L : Plua_State; n : Integer) : Boolean;
function lua_isnoneornil(L : Plua_State; n : Integer) : 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 : Integer) : PChar;


(*
** compatibility macros and functions
*)
function lua_open : Plua_State;

procedure lua_getregistry(L : Plua_State);

function lua_getgccount(L : Plua_State) : Integer;

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 : Integer;
    name : PChar;          (* (n) *)
    namewhat : PChar;      (* (n) `global', `local', `field', `method' *)
    what : PChar;          (* (S) `Lua', `C', `main', `tail' *)
    source : PChar;        (* (S) *)
    currentline : Integer; (* (l) *)
    nups : Integer;        (* (u) number of upvalues *)
    linedefined : Integer; (* (S) *)
    short_src : array [0..LUA_IDSIZE-1] of Char; (* (S) *)
    (* private part *)
    i_ci : Integer;        (* 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 : Integer;
                      ar : Plua_Debug) : Integer;
  cdecl; external LuaDLL;
function lua_getinfo(L : Plua_State; const what : PChar;
                     ar: Plua_Debug): Integer;
  cdecl; external LuaDLL;
function lua_getlocal(L : Plua_State;
                      ar : Plua_Debug; n : Integer) : PChar;
  cdecl; external LuaDLL;
function lua_setlocal(L : Plua_State;
                      ar : Plua_Debug; n : Integer) : PChar;
  cdecl; external LuaDLL;
function lua_getupvalue(L : Plua_State; funcindex, n : Integer) : PChar;
  cdecl; external LuaDLL;
function lua_setupvalue(L : Plua_State; funcindex, n : Integer) : PChar;
  cdecl; external LuaDLL;

function lua_sethook(L : Plua_State; func : lua_Hook;
                     mask, count: Integer): Integer;
  cdecl; external LuaDLL;
{
function lua_gethook(L : Plua_State) : lua_Hook;
  cdecl; external LuaDLL;
}
function lua_gethookmask(L : Plua_State) : Integer;
  cdecl; external LuaDLL;
function lua_gethookcount(L : Plua_State) : Integer;
  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) : Integer;
  cdecl; external LuaDLL;

function luaopen_table(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function luaopen_io(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function luaopen_os(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function luaopen_string(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function luaopen_math(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function luaopen_debug(L : Plua_State) : Integer;
  cdecl; external LuaDLL;

function luaopen_package(L : Plua_State) : Integer;
  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 : Integer) : Integer;
procedure luaL_setn(L : Plua_State; i, j : Integer);

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 : Integer);
  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 : Integer;
                           const e : PChar) : Integer;
  cdecl; external LuaDLL;
function luaL_callmeta(L : Plua_State; obj : Integer;
                       const e : PChar) : Integer;
  cdecl; external LuaDLL;
function luaL_typerror(L : Plua_State; narg : Integer;
                       const tname : PChar) : Integer;
  cdecl; external LuaDLL;
function luaL_argerror(L : Plua_State; numarg : Integer;
                       const extramsg : PChar) : Integer;
  cdecl; external LuaDLL;
function luaL_checklstring(L : Plua_State; numArg : Integer;
                           ls : Psize_t) : PChar;
  cdecl; external LuaDLL;
function luaL_optlstring(L : Plua_State; numArg : Integer;
                         const def: PChar; ls: Psize_t) : PChar;
  cdecl; external LuaDLL;
function luaL_checknumber(L : Plua_State; numArg : Integer) : lua_Number;
  cdecl; external LuaDLL;
function luaL_optnumber(L : Plua_State; nArg : Integer;
                        def : lua_Number) : lua_Number;
  cdecl; external LuaDLL;

function luaL_checkinteger(L : Plua_State; numArg : Integer) : lua_Integer;
  cdecl; external LuaDLL;
function luaL_optinteger(L : Plua_State; nArg : Integer;
                        def : lua_Integer) : lua_Integer;
  cdecl; external LuaDLL;

procedure luaL_checkstack(L : Plua_State; sz : Integer; const msg : PChar);
  cdecl; external LuaDLL;
procedure luaL_checktype(L : Plua_State; narg, t : Integer);
  cdecl; external LuaDLL;
procedure luaL_checkany(L : Plua_State; narg : Integer);
  cdecl; external LuaDLL;

function luaL_newmetatable(L : Plua_State; const tname : PChar) : Integer;
  cdecl; external LuaDLL;
function luaL_checkudata(L : Plua_State; ud : Integer;
                         const tname : PChar) : Pointer;
  cdecl; external LuaDLL;

procedure luaL_where(L : Plua_State; lvl : Integer);
  cdecl; external LuaDLL;
function  luaL_error(L : Plua_State; const fmt : PChar) : Integer; varargs;
  cdecl; external LuaDLL;

function luaL_checkoption(L : Plua_State; narg : Integer; const def : PChar;
                          const lst : array of PChar) : Integer;
  cdecl; external LuaDLL;

function  luaL_ref(L : Plua_State; t : Integer) : Integer;
  cdecl; external LuaDLL;
procedure luaL_unref(L : Plua_State; t, ref : Integer);
  cdecl; external LuaDLL;

function luaL_loadfile(L : Plua_State; const filename : PChar) : Integer;
  cdecl; external LuaDLL;
function luaL_loadbuffer(L : Plua_State; const buff : PChar;
                         sz : size_t; const name: PChar) : Integer;
  cdecl; external LuaDLL;

function luaL_loadstring(L : Plua_State; const s : Pchar) : Integer;
  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 : Integer;
                        const fname : PChar; szhint : Integer) : PChar;
  cdecl; external LuaDLL;


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

function luaL_argcheck(L : Plua_State; cond : Boolean; numarg : Integer;
                       extramsg : PChar): Integer;
function luaL_checkstring(L : Plua_State; n : Integer) : PChar;
function luaL_optstring(L : Plua_State; n : Integer; d : PChar) : PChar;
function luaL_checkint(L : Plua_State; n : Integer) : Integer;
function luaL_optint(L : Plua_State; n, d : Integer): Integer;
function luaL_checklong(L : Plua_State; n : LongInt) : LongInt;
function luaL_optlong(L : Plua_State; n : Integer; d : LongInt) : LongInt;

function luaL_typename(L : Plua_State; idx : Integer) : PChar;

function luaL_dofile(L : Plua_State; fn : PChar) : Integer;

function luaL_dostring(L : Plua_State; s : PChar) : Integer;

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 : Integer;   (* 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 : Integer);

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) : Integer;

procedure lua_unref(L : Plua_State; ref : Integer);

procedure lua_getref(L : Plua_State; ref : Integer);


(******************************************************************************)
(******************************************************************************)
(******************************************************************************)

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 : Integer);
begin
end;

procedure lua_freeline(L : Plua_State; b : PChar);
begin
end;


(*****************************************************************************)
(*                                  lua.h                                    *)
(*****************************************************************************)

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

procedure lua_pop(L : Plua_State; n : Integer);
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 : Integer) : Integer;
begin
  lua_strlen := lua_objlen(L, idx);
end;

function lua_isfunction(L : Plua_State; n : Integer) : Boolean;
begin
  lua_isfunction := lua_type(L, n) = LUA_TFUNCTION;
end;

function lua_istable(L : Plua_State; n : Integer) : Boolean;
begin
  lua_istable := lua_type(L, n) = LUA_TTABLE;
end;

function lua_islightuserdata(L : Plua_State; n : Integer) : Boolean;
begin
  lua_islightuserdata := lua_type(L, n) = LUA_TLIGHTUSERDATA;
end;

function lua_isnil(L : Plua_State; n : Integer) : Boolean;
begin
  lua_isnil := lua_type(L, n) = LUA_TNIL;
end;

function lua_isboolean(L : Plua_State; n : Integer) : Boolean;
begin
  lua_isboolean := lua_type(L, n) = LUA_TBOOLEAN;
end;

function lua_isthread(L : Plua_State; n : Integer) : Boolean;
begin
  lua_isthread := lua_type(L, n) = LUA_TTHREAD;
end;

function lua_isnone(L : Plua_State; n : Integer) : Boolean;
begin
  lua_isnone := lua_type(L, n) = LUA_TNONE;
end;

function lua_isnoneornil(L : Plua_State; n : Integer) : 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 : Integer) : 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) : Integer;
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 : Integer) : Integer;
begin
  luaL_getn := lua_objlen(L, idx);
end;

procedure luaL_setn(L : plua_State; i, j : Integer);
begin
  (* no op *)
end;

function luaL_argcheck(L : Plua_State; cond : Boolean; numarg : Integer;
                       extramsg : PChar): Integer;
begin
  if not cond then
    luaL_argcheck := luaL_argerror(L, numarg, extramsg)
  else
    luaL_argcheck := 0;
end;

function luaL_checkstring(L : Plua_State; n : Integer) : PChar;
begin
  luaL_checkstring := luaL_checklstring(L, n, nil);
end;

function luaL_optstring(L : Plua_State; n : Integer; d : PChar) : PChar;
begin
  luaL_optstring := luaL_optlstring(L, n, d, nil);
end;

function luaL_checkint(L : Plua_State; n : Integer) : Integer;
begin
  luaL_checkint := luaL_checkinteger(L, n);
end;

function luaL_optint(L : Plua_State; n, d : Integer): Integer;
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 : Integer; d : LongInt) : LongInt;
begin
  luaL_optlong := luaL_optinteger(L, n, d);
end;

function luaL_typename(L : Plua_State; idx : Integer) : PChar;
begin
  luaL_typename := lua_typename( L, lua_type(L, idx) );
end;

function luaL_dofile(L : Plua_State; fn : PChar) : Integer;
Var
  Res : Integer;
begin
  // WC 2007\03\22 - Updated for Delphi
  Res := luaL_loadfile(L, fn);
  if Res = 0 then
    Res := lua_pcall(L, 0, LUA_MULTRET, 0);
  Result := Res;
end;

function luaL_dostring(L : Plua_State; s : PChar) : Integer;
Var
  Res : Integer;
begin
  // WC 2007\03\22 - Updated for Delphi
  Res := luaL_loadstring(L, s);
  if Res = 0 then
    Res := lua_pcall(L, 0, LUA_MULTRET, 0);
  Result := Res;
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 : Integer);
begin
  Inc(B^.p, n);
end;

function lua_ref(L : Plua_State; lock : Boolean) : Integer;
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 : Integer);
begin
  luaL_unref(L, LUA_REGISTRYINDEX, ref);
end;

procedure lua_getref(L : Plua_State; ref : Integer);
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.