{
	This file is part of the Mufasa Macro Library (MML)
	Copyright (c) 2009 by Raymond van Venetië and Merlijn Wajer

    MML is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    MML 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 MML.  If not, see <http://www.gnu.org/licenses/>.

	See the file COPYING, included in this distribution,
	for details about the copyright.

    MMLPSThread for the Mufasa Macro Library
}

unit mmlpsthread;

{$Define PS_USESSUPPORT}
{$define PS_StdCall}

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, client, uPSComponent,uPSCompiler,
  uPSRuntime,stdCtrls, uPSPreProcessor,MufasaTypes, web,
  bitmaps, plugins, libloader, dynlibs;


type
    { TMMLPSThread }
    TSyncInfo = record
      V : MufasaTypes.TVariantArray;
      MethodName : string;
      Res : Variant;
      SyncMethod : procedure of object;
      OldThread : TThread;
    end;

    TWritelnProc = procedure(s: string);
    TDbgImgInfo = record
      DispSize : ^TPoint;
      ShowForm : procedure of object;
      ToDrawBitmap : ^TMufasaBitmap;
      DrawBitmap : procedure of object;
      GetDebugBitmap : ^TMufasaBitmap;
      GetBitmap : procedure of object;
    end;
    PSyncInfo = ^TSyncInfo;
    TErrorType = (errRuntime,errCompile);
    TOnError = procedure of object;
    TErrorData = record
      Line,Position : integer;
      Error : string;
      ErrType : TErrorType;
      Module : string;
      IncludePath : string;
    end;
    PErrorData = ^TErrorData;
    TExpMethod = record
      Section : string;
      FuncDecl : string;
      FuncPtr : Pointer;
    end;
    TExpMethodArr = array of TExpMethod;

    TMThread = class(TThread)
    protected
      ScriptPath, AppPath, IncludePath, PluginPath, FontPath: string;
      DebugTo: TWritelnProc;
      DebugImg : TDbgImgInfo;
      PluginsToload : array of integer;
      ExportedMethods : TExpMethodArr;

    public
      Client : TClient;
      StartTime : LongWord;
      DebugMemo : TMemo;

      SyncInfo : PSyncInfo; //We need this for callthreadsafe
      ErrorData : PErrorData; //We need this for thread-safety etc
      OnError  : TOnError; //Error handeler

      procedure HandleError(ErrorAtLine,ErrorPosition : integer; ErrorStr : string; ErrorType : TErrorType; ErrorModule : string);
      function ProcessDirective(DirectiveName, DirectiveArgs: string): boolean;
      function LoadFile(var filename, contents: string): boolean;
      procedure AddMethod(meth: TExpMethod); virtual;

      procedure SetScript(Script : string);
      procedure SetDebug( writelnProc : TWritelnProc );
      procedure SetDbgImg( DebugImageInfo : TDbgImgInfo);
      procedure SetPaths(ScriptP,AppP,IncludeP,PluginP,FontP : string);
      procedure OnThreadTerminate(Sender: TObject);
      procedure SetScript(script: string); virtual; abstract;
      procedure Execute; override; abstract;
      procedure Terminate; virtual; abstract;

      constructor Create(CreateSuspended: boolean; TheSyncInfo : PSyncInfo; plugin_dir: string);
      destructor Destroy; override;

      class function GetExportedMethods : TExpMethodArr;
    end;

    TPSThread = class(TMThread)
      public
        procedure OnProcessDirective(Sender: TPSPreProcessor;
          Parser: TPSPascalPreProcessorParser; const Active: Boolean;
          const DirectiveName, DirectiveParam: string; var Continue: Boolean);
        function PSScriptFindUnknownFile(Sender: TObject;
          const OrginFileName: string; var FileName, Output: string): Boolean;
        procedure PSScriptProcessUnknowDirective(Sender: TPSPreProcessor;
          Parser: TPSPascalPreProcessorParser; const Active: Boolean;
          const DirectiveName, DirectiveParam: string; var Continue: Boolean);
      protected
        procedure OnCompile(Sender: TPSScript);
        function RequireFile(Sender: TObject; const OriginFileName: String;
                            var FileName, OutPut: string): Boolean;
        procedure OnCompImport(Sender: TObject; x: TPSPascalCompiler);
        procedure OnExecImport(Sender: TObject; se: TPSExec; x: TPSRuntimeClassImporter);
        procedure OutputMessages;
      public
        PSScript : TPSScript;
        constructor Create(CreateSuspended: Boolean; TheSyncInfo : PSyncInfo; plugin_dir: string);
        destructor Destroy; override;
        procedure SetScript(script: string); override;
        procedure Execute; override;
        procedure Terminate; override;
    end;

    TPrecompiler_Callback = function(name, args: PChar): boolean; stdcall;
    TErrorHandeler_Callback = procedure(line, pos: integer; err: PChar); stdcall;

    TInterpreter = record
      Create: function(ppg: PChar; precomp: TPrecompiler_Callback; err: TErrorHandeler_Callback): pointer; cdecl;
      AddMethod: procedure(interp: pointer; address: pointer; def: PChar);
      Run: procedure(interp: pointer);
      Stop: procedure(interp: pointer);
      Destroy: procedure(interp: pointer);
    end;

    TInterpreterLoader = class(TGenericLoader)
      protected
        interps: array of TInterpreter;
        function InitPlugin(plugin: TLibHandle): boolean; override;
      public
        function GetInterpreter(idx: integer): TInterpreter;
    end;

    TInterpreterThread = class(TMThread)
      protected
        instance: pointer;
        interpreter: TInterpreter;
      public
        constructor Create(libname: string; CreateSuspended: Boolean; TheSyncInfo : PSyncInfo; plugin_dir: string);
        destructor Destroy; override;
        procedure SetScript(script: string); override;
        procedure Execute; override;
        procedure Terminate; override;
        procedure AddMethod(meth: TExpMethod); override;
    end;

threadvar
  CurrThread : TMThread;
var
  PluginsGlob: TMPlugins;
  interp_loader: TInterpreterLoader;

implementation

uses
  colour_conv,dtmutil,
  {$ifdef mswindows}windows,{$endif}
  uPSC_std, uPSC_controls,uPSC_classes,uPSC_graphics,uPSC_stdctrls,uPSC_forms,
  uPSC_extctrls, //Compile-libs
  uPSUtils,
  fontloader,
  uPSR_std, uPSR_controls,uPSR_classes,uPSR_graphics,uPSR_stdctrls,uPSR_forms,
  uPSR_extctrls, //Runtime-libs
  Graphics, //For Graphics types
  math, //Maths!
  internets, // internets
  strutils,
  tpa, //Tpa stuff
  forms,//Forms
  lclintf; // for GetTickCount and others.

{$MACRO ON}
{$ifdef PS_StdCall}
  {$define ps_decl := stdcall}
{$else}
  {$define ps_decl := REGISTER}
{$endif}

{Some General PS Functions here}
procedure psWriteln(str : string);
begin
  if Assigned(CurrThread.DebugTo) then
    CurrThread.DebugTo(str)
  else
    writeln(str);
end;

function MakeString(data : TPSVariantIFC) : string;
begin;
  if data.aType.basetype in [btString,btChar] then
    result := PSGetAnsiString(Data.Dta,data.aType)
  else if data.aType.ExportName = 'BOOLEAN' then
    result := BoolToStr(PSGetInt(Data.Dta,data.aType) <> 0,true)
  else
    result := PSVariantToString(data,'');
end;

function writeln_(Caller: TPSExec; p: TPSExternalProcRec; Global, Stack: TPSStack): Boolean;
var
  arr: TPSVariantIFC;
begin
  Result:=true;
  psWriteln(makeString(NewTPSVariantIFC(Stack[Stack.Count-1],false)));
end;

function swap_(Caller: TPSExec; p: TPSExternalProcRec; Global, Stack: TPSStack): Boolean;
var
  Param1,Param2: TPSVariantIFC;
  tempCopy : pointer;
begin
  Result:=true;
  Param1 := NewTPSVariantIFC(Stack[Stack.count-1],true);
  Param2 := NewTPSVariantIFC(Stack[Stack.count-2],true);
  if Param1.aType.BaseType <> Param2.aType.BaseType then
    exit(false)
  else
  begin
    Param1.aType.CalcSize;
    param2.aType.CalcSize;
    if Param1.aType.RealSize <> Param2.aType.RealSize then
      exit(false);
    GetMem(tempcopy,Param1.aType.RealSize);
    Move(Param1.Dta^,tempCopy^,param1.atype.realsize);
    Move(Param2.Dta^,Param1.Dta^,param1.atype.realsize);
    Move(tempCopy^,Param2.Dta^,param1.atype.realsize);
    Freemem(tempcopy);
  end;
end;

function ToStr_(Caller: TPSExec; p: TPSExternalProcRec; Global, Stack: TPSStack): Boolean;
var
  data: TPSVariantIFC;
begin
  result := true;
  Stack.SetAnsiString(-1, MakeString(NewTPSVariantIFC(Stack[Stack.Count-2],false)));
end;

{***implementation TMThread***}
constructor TMThread.Create(CreateSuspended: boolean; TheSyncInfo: PSyncInfo; plugin_dir: string);
begin
  Client := TClient.Create(plugin_dir);
  SyncInfo:= TheSyncInfo;
  ExportedMethods:= GetExportedMethods;
  SetLength(PluginsToLoad,0);
  FreeOnTerminate := True;
  OnTerminate := @OnThreadTerminate;
  OnError:= nil;
  inherited Create(CreateSuspended);
end;

destructor TMThread.Destroy;
begin
  SetLength(PluginsToLoad,0);
  Client.Free;
  inherited Destroy;
end;

procedure TMThread.HandleError(ErrorAtLine, ErrorPosition: integer; ErrorStr: string; ErrorType: TErrorType; ErrorModule : string);
begin
  if OnError = nil then
    exit;
  ErrorData^.Line:= ErrorAtLine;
  ErrorData^.Position:= ErrorPosition;
  ErrorData^.Error:= ErrorStr;
  ErrorData^.ErrType:= ErrorType;
  ErrorData^.Module:= ErrorModule;
  ErrorData^.IncludePath:= IncludePath;
  CurrThread.Synchronize(OnError);
end;

procedure TMThread.OnThreadTerminate(Sender: TObject);
begin

end;

procedure TMThread.AddMethod(meth: TExpMethod);
begin
end;

function TMThread.ProcessDirective(DirectiveName, DirectiveArgs: string): boolean;
var
  plugin_idx, i: integer;
begin
  if DirectiveName= 'LOADDLL' then
  begin
    if DirectiveArgs <> '' then
    begin;
      plugin_idx:= PluginsGlob.LoadPlugin(DirectiveArgs);
      if plugin_idx < 0 then
        psWriteln(Format('Your DLL %s has not been found',[DirectiveArgs]))
      else
      begin;
        for i := High(PluginsToLoad) downto 0 do
          if PluginsToLoad[i] = plugin_idx then
            Exit;
        SetLength(PluginsToLoad,Length(PluginsToLoad)+1);
        PluginsToLoad[High(PluginsToLoad)]:= plugin_idx;
      end;
    end;
  end;
  result:= True;
end;

function TMThread.LoadFile(var filename, contents: string): boolean;
var
  path: string;
  f: TFileStream;
begin
  if FileExists(filename) then
    path:= filename
  else
    path:= IncludePath + filename;
  if not FileExists(path) then
  begin
    psWriteln(Path + ' doesn''t exist');
    Result := false;
    Exit;
  end;
  try
    f:= TFileStream.Create(Path, fmOpenRead or fmShareDenyWrite);
  except
    Result := false;
    exit;
  end;
  try
    try
      SetLength(contents, f.Size);
      f.Read(contents[1], Length(contents));
      result:= true;
    finally
      f.free;
    end;
  except
    result:= false;
  end;
end;

procedure TMThread.SetDebug(writelnProc: TWritelnProc);
begin
  DebugTo := writelnProc;
end;

procedure TMThread.SetDbgImg(DebugImageInfo: TDbgImgInfo);
begin
  DebugImg := DebugImageInfo;
end;

procedure TMThread.SetPaths(ScriptP, AppP,IncludeP,PluginP,FontP: string);
begin
  AppPath:= AppP;
  ScriptPath:= ScriptP;
  IncludePath:= IncludeP;
  PluginPath:= PluginP;
  FontPath:= FontP;
end;

function ThreadSafeCall(ProcName: string; var V: TVariantArray): Variant; stdcall;
begin
  CurrThread.SyncInfo^.MethodName:= ProcName;
  CurrThread.SyncInfo^.V:= V;
  CurrThread.SyncInfo^.OldThread := CurrThread;
  CurrThread.Synchronize(CurrThread.SyncInfo^.SyncMethod);
  Result := CurrThread.SyncInfo^.Res;
end;

{$I PSInc/Wrappers/other.inc}
{$I PSInc/Wrappers/bitmap.inc}
{$I PSInc/Wrappers/window.inc}

{$I PSInc/Wrappers/strings.inc}

{$I PSInc/Wrappers/colour.inc}
{$I PSInc/Wrappers/math.inc}
{$I PSInc/Wrappers/mouse.inc}
{$I PSInc/Wrappers/file.inc}

{$I PSInc/Wrappers/keyboard.inc}
{$I PSInc/Wrappers/dtm.inc}
{$I PSInc/Wrappers/ocr.inc}
{$I PSInc/Wrappers/internets.inc}

class function TMThread.GetExportedMethods: TExpMethodArr;
var
  c : integer;
  CurrSection : string;

procedure SetCurrSection(str : string);
begin;
  CurrSection := Str;
end;

procedure AddFunction( Ptr : Pointer; DeclStr : String);
begin;
  if c >= 300 then
    raise exception.create('PSThread.LoadMethods: Exported more than 300 functions');
  Result[c].FuncDecl:= DeclStr;
  Result[c].FuncPtr:= Ptr;
  Result[c].Section:= CurrSection;
  inc(c);
end;

begin
  c := 0;
  CurrSection := 'Other';
  SetLength(Result,300);

  {$i PSInc/psexportedmethods.inc}

  SetLength(Result,c);
end;

{***implementation TPSThread***}

{
  Note to Raymond: For PascalScript, Create it on the .Create,
  Execute it on the .Execute, and don't forget to Destroy it on .Destroy.

  Furthermore, all the wrappers can be in the unit "implementation" section.
  Better still to create an .inc for it, otherwise this unit will become huge.
  (You can even split up the .inc's in stuff like color, bitmap, etc. )

  Also, don't add PS to this unit, but make a seperate unit for it.
  Unit "MMLPSThread", perhaps?

  See the TestUnit for use of this thread, it's pretty straightforward.

  It may also be wise to turn the "Importing of wrappers" into an include as
  well, it will really make the unit more straightforward to use and read.
}

constructor TPSThread.Create(CreateSuspended : boolean; TheSyncInfo : PSyncInfo; plugin_dir: string);
begin
  PSScript := TPSScript.Create(nil);
  PSScript.UsePreProcessor:= True;
  PSScript.OnNeedFile := @RequireFile;
  PSScript.OnProcessDirective:=@OnProcessDirective;
  PSScript.OnProcessUnknowDirective:=@PSScriptProcessUnknowDirective;
  PSScript.OnCompile:= @OnCompile;
  PSScript.OnCompImport:= @OnCompImport;
  PSScript.OnExecImport:= @OnExecImport;
  PSScript.OnFindUnknownFile:=@PSScriptFindUnknownFile;
  // Set some defines
  {$I PSInc/psdefines.inc}
  inherited Create(CreateSuspended, TheSyncInfo, plugin_dir);
end;


destructor TPSThread.Destroy;
begin
  PSScript.Free;
  inherited;
end;

procedure TPSThread.OnProcessDirective(Sender: TPSPreProcessor;
  Parser: TPSPascalPreProcessorParser; const Active: Boolean;
  const DirectiveName, DirectiveParam: string; var Continue: Boolean);
begin
end;

function TPSThread.PSScriptFindUnknownFile(Sender: TObject;
  const OrginFileName: string; var FileName, Output: string): Boolean;
begin
  Writeln(OrginFileName + '-' +  Output + '-' + FileName);
end;

procedure TPSThread.PSScriptProcessUnknowDirective(Sender: TPSPreProcessor;
  Parser: TPSPascalPreProcessorParser; const Active: Boolean;
  const DirectiveName, DirectiveParam: string; var Continue: Boolean);
begin
  Continue:= ProcessDirective(DirectiveName, DirectiveParam);
end;

procedure TPSThread.OnCompile(Sender: TPSScript);
var
  i,ii : integer;
  Fonts : TMFonts;
begin
  {$I PSInc/pscompile.inc}
  Fonts := Client.MOCR.GetFonts;
  for i := fonts.count - 1 downto 0 do
    PSScript.Comp.AddConstantN(Fonts[i].Name,'string').SetString(Fonts[i].Name);

  for i := high(PluginsToLoad) downto 0 do
    for ii := 0 to PluginsGlob.MPlugins[PluginsToLoad[i]].MethodLen - 1 do
      PSScript.AddFunctionEx(PluginsGlob.MPlugins[PluginsToLoad[i]].Methods[ii].FuncPtr,
                           PluginsGlob.MPlugins[PluginsToLoad[i]].Methods[ii].FuncStr, cdStdCall);

  for i := 0 to high(VirtualKeys) do
    PSScript.Comp.AddConstantN(Format('VK_%S',[VirtualKeys[i].Str]),'Byte').SetInt(VirtualKeys[i].Key);
  // Here we add all the Consts/Types to the engine.

  //Export all the methods
  for i := 0 to high(ExportedMethods) do
    if ExportedMethods[i].FuncPtr <> nil then
      PSScript.AddFunctionEx(ExportedMethods[i].FuncPtr,ExportedMethods[i].FuncDecl,
                             {$ifdef PS_StdCall}cdStdCall{$else}cdRegister {$endif});
end;

function TPSThread.RequireFile(Sender: TObject;
  const OriginFileName: String; var FileName, OutPut: string): Boolean;
begin
  result:= LoadFile(FileName,OutPut);
end;

procedure SIRegister_Mufasa(cl: TPSPascalCompiler);
begin
  with cl.AddClassN(cl.FindClass('TObject'),'TMufasaBitmap') do
  begin;
    RegisterMethod('constructor create');
    RegisterMethod('procedure Free');
    RegisterMethod('function SaveToFile(const FileName : string) :boolean;');
    RegisterMethod('procedure LoadFromFile(const FileName : string);');
    RegisterProperty('Index','Integer',iptR);
  end;
end;

function CreateMufasaBitmap : TMufasaBitmap;
begin;
  result := TMufasaBitmap.Create;
  CurrThread.Client.MBitmaps.AddBMP(result);
end;

procedure FreeMufasaBitmap(Self : TMufasaBitmap);
begin;
  CurrThread.Client.MBitmaps.FreeBMP(Self.Index);
end;

procedure MufasaBitmapIndex(self : TMufasaBitmap; var Index : integer);
begin;
  Index := self.Index;
end;

procedure RIRegister_Mufasa(cl: TPSRuntimeClassImporter);
begin;
  with cl.Add(TMufasaBitmap) do
  begin
    RegisterConstructor(@CreateMufasaBitmap,'CREATE');
    RegisterMethod(@FreeMufasaBitmap,'FREE');
    RegisterMethod(@TMufasaBitmap.SaveToFile, 'SAVETOFILE');
    RegisterMethod(@TMufasaBitmap.LoadFromFile, 'LOADFROMFILE');
    RegisterPropertyHelper(@MufasaBitmapIndex,nil,'INDEX');
  end;
end;

procedure TPSThread.OnCompImport(Sender: TObject; x: TPSPascalCompiler);
begin
  SIRegister_Std(x);
  SIRegister_Controls(x);
  SIRegister_Classes(x, true);
  SIRegister_Graphics(x, true);
  SIRegister_stdctrls(x);
  SIRegister_Forms(x);
  SIRegister_ExtCtrls(x);
  SIRegister_Mufasa(x);
  with x.AddFunction('procedure writeln;').decl do
    with AddParam do
    begin
      OrgName:= 'x';
      Mode:= pmIn;
    end;
  with x.AddFunction('function ToStr:string').decl do
    with addparam do
    begin
      OrgName:= 'x';
      Mode:= pmIn;
    end;
  with x.AddFunction('procedure swap;').decl do
  begin
    with addparam do
    begin
      OrgName:= 'x';
      Mode:= pmInOut;
    end;
    with addparam do
    begin
      OrgName:= 'y';
      Mode:= pmInOut;
    end;
  end;
end;

procedure TPSThread.OnExecImport(Sender: TObject; se: TPSExec;
  x: TPSRuntimeClassImporter);
begin
  RIRegister_Std(x);
  RIRegister_Classes(x, True);
  RIRegister_Controls(x);
  RIRegister_Graphics(x, True);
  RIRegister_stdctrls(x);
  RIRegister_Forms(x);
  RIRegister_ExtCtrls(x);
  RIRegister_Mufasa(x);
  se.RegisterFunctionName('WRITELN',@Writeln_,nil,nil);
  se.RegisterFunctionName('TOSTR',@ToStr_,nil,nil);
  se.RegisterFunctionName('SWAP',@swap_,nil,nil);
end;

procedure TPSThread.OutputMessages;
var
  l: Longint;
  b: Boolean;
begin
  b := False;
  for l := 0 to PSScript.CompilerMessageCount - 1 do
  begin
    if (not b) and (PSScript.CompilerMessages[l] is TIFPSPascalCompilerError) then
    begin
      b := True;
      if OnError <> nil then
        with PSScript.CompilerMessages[l] do
          HandleError(Row, Pos, MessageToString,errCompile, ModuleName)
      else
        psWriteln(PSScript.CompilerErrorToStr(l) + ' at line ' + inttostr(PSScript.CompilerMessages[l].Row));
    end else
      psWriteln(PSScript.CompilerErrorToStr(l) + ' at line ' + inttostr(PSScript.CompilerMessages[l].Row));

  end;
end;

procedure TPSThread.Execute;
begin
  CurrThread := Self;
  Starttime := lclintf.GetTickCount;

  try
    if PSScript.Compile then
    begin
      OutputMessages;
      psWriteln('Compiled succesfully in ' + IntToStr(GetTickCount - Starttime) + ' ms.');
//      if not (ScriptState = SCompiling) then
        if not PSScript.Execute then
          HandleError(PSScript.ExecErrorRow,PSScript.ExecErrorPosition,PSScript.ExecErrorToString,
                      errRuntime, PSScript.ExecErrorFileName)
        else
          psWriteln('Succesfully executed');
    end else
    begin
      OutputMessages;
      psWriteln('Compiling failed');
    end;
  except
     on E : Exception do
       psWriteln('ERROR IN PSSCRIPT: ' + e.message);
  end;
end;

procedure TPSThread.Terminate;
begin
  PSScript.Stop;
end;

procedure TPSThread.SetScript(script: string);
begin
   PSScript.Script.Text:= Script;
end;

{***implementation TCPThread***}

constructor TInterpreterThread.Create(libname: string; CreateSuspended: Boolean; TheSyncInfo : PSyncInfo; plugin_dir: string);
var
  plugin_idx: integer;
begin
  interp_loader.AddPath(plugin_dir);
  plugin_idx:= interp_loader.LoadPlugin(libname);
  if plugin_idx < 0 then
    raise Exception.Create(Format('Could not locate the interpreter library: %s',[libname]));
  interpreter:= interp_loader.GetInterpreter(plugin_idx);
  instance:= nil;
  inherited Create(CreateSuspended, TheSyncInfo, plugin_dir);
end;

destructor TInterpreterThread.Destroy;
begin
  if instance <> nil then
    interpreter.Destroy(instance);
  inherited Destroy;
end;

function Interpreter_Precompiler(name, args: PChar): boolean; stdcall;
begin
  result:= CurrThread.ProcessDirective(name, args);
end;

procedure Interpreter_ErrorHandler(line, pos: integer; err: PChar); stdcall;
begin
  CurrThread.HandleError(line,pos,err,errRuntime,'');
end;

procedure TInterpreterThread.SetScript(script: string);
var
  i: integer;
begin
  if instance <> nil then
    interpreter.Destroy(instance);
  instance:= interpreter.Create(PChar(@script[1]), @Interpreter_Precompiler, @Interpreter_ErrorHandler);
  for i := 0 to high(ExportedMethods) do
    if ExportedMethods[i].FuncPtr <> nil then
      interpreter.AddMethod(instance,ExportedMethods[i].FuncPtr,PChar(ExportedMethods[i].FuncDecl));
end;

procedure TInterpreterThread.AddMethod(meth: TExpMethod);
begin
  if instance = nil then
     raise Exception.Create('Script not set, cannot add method');
  interpreter.AddMethod(instance,meth.FuncPtr,PChar(meth.FuncDecl));
end;

procedure TInterpreterThread.Execute;
begin
  if instance = nil then
     raise Exception.Create('Script not set, cannot run');
  interpreter.Run(instance);
end;

procedure TInterpreterThread.Terminate;
begin
  if @interpreter.Stop = nil then
     raise Exception.Create('Stopping Interpreter not yet implemented');
  interpreter.Stop(instance);
end;

{***implementation TInterpreterLoader***}

function TInterpreterLoader.InitPlugin(plugin: TLibHandle): boolean;
var
  i: integer;
begin
  result:= true;
  i:= length(interps);
  SetLength(interps,i+1);
  Pointer(interps[i].Create) := GetProcAddress(plugin, PChar('interp_init'));
  Pointer(interps[i].Destroy) := GetProcAddress(plugin, PChar('interp_free'));
  Pointer(interps[i].Run) := GetProcAddress(plugin, PChar('interp_run'));
  Pointer(interps[i].AddMethod) := GetProcAddress(plugin, PChar('interp_meth'));
  //Optional methods...
  Pointer(interps[i].Stop) := GetProcAddress(plugin, PChar('interp_stop'));
  if (Pointer(interps[i].Create) = nil) or (Pointer(interps[i].Destroy) = nil) or
     (Pointer(interps[i].Run) = nil) or (Pointer(interps[i].AddMethod) = nil) then
  begin
    SetLength(interps,i);
    result:= false;
  end;
end;

function TInterpreterLoader.GetInterpreter(idx: integer): TInterpreter;
begin
  result:= interps[idx];
end;

initialization
  PluginsGlob := TMPlugins.Create;
  interp_loader := TInterpreterLoader.Create;
finalization
  //PluginsGlob.Free;
  //Its a nice idea, but it will segfault... the program is closing anyway.
end.