/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            lua.cc
 *
 *  Thu May 29 16:30:50 CEST 2008
 *  Copyright 2008 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of Pracro.
 *
 *  Pracro 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.
 *
 *  Pracro 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 Pracro; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "lua.h"

LUA::LUA(Variables &variables)
{
  L = luaL_newstate();
  if(L == NULL) {
    //    throw LUADataParserException("Could not create LUA state.");
  }

  luaL_openlibs(L);

  std::string preload;
  Variables::iterator var = variables.begin();
  while(var != variables.end()) {
    preload += (*var).first + " = \"" + (*var).second + "\"\n";
    var++;
  }
  
  int s = luaL_loadbuffer(L, preload.c_str(), preload.size(), "preload");
  switch(s) {
  case 0: //no errors;
    break;
  case LUA_ERRSYNTAX: //syntax error during pre-compilation;
  case LUA_ERRMEM: //memory allocation error.
  case LUA_ERRFILE: //cannot open/read the file.
    //throw LUADataParserException(lua_tostring(L, lua_gettop(L)));
    break;
  default:
    //throw LUADataParserException("Unknown return value of luaL_loadfile.");
    break;
  }

  // Run program (init)
  lua_pcall(L, 0, LUA_MULTRET, 0);
}

LUA::~LUA()
{
  lua_close(L);
}

std::string LUA::run(std::string &program)
{
  int s = luaL_loadbuffer(L, program.c_str(), program.size(), "program");
  switch(s) {
  case 0: //no errors;
    break;
  case LUA_ERRSYNTAX: //syntax error during pre-compilation;
  case LUA_ERRMEM: //memory allocation error.
  case LUA_ERRFILE: //cannot open/read the file.
    //throw LUADataParserException(lua_tostring(L, lua_gettop(L)));
    break;
  default:
    //throw LUADataParserException("Unknown return value of luaL_loadfile.");
    break;
  }

  // Run the loaded code
  lua_pcall(L, 0, LUA_MULTRET, 0);

  std::string res = lua_tostring(L, lua_gettop(L));
  lua_pop(L, 1);

  return res;
}