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/* -*- 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 "luaresume.h"
#include "debug.h"
#include <stdio.h>
#define GLOBAL_POINTER "_pracroGlobalLUAObjectPointerThisShouldBeANameThatIsNotAccidentallyOverwritten"
static int _getValue(lua_State *L)
{
int n = lua_gettop(L); // number of arguments
if(n != 1) {
char errstr[512];
sprintf(errstr, "Number of args expected 0, got %d", n);
lua_pushstring(L, errstr);
lua_error(L);
return 1;
}
std::string name = lua_tostring(L, lua_gettop(L));
lua_getglobal(L, GLOBAL_POINTER);
LUAResume *lua = (LUAResume*)lua_touserdata(L, lua_gettop(L));
if(!lua) {
lua_pushstring(L, "No LUA pointer!");
lua_error(L);
return 1;
}
std::string value = lua->getValue(name);
lua_pushstring(L, value.c_str());
return 1;
}
LUAResume::LUAResume(Commit &c)
: commit(c)
{
L = luaL_newstate();
if(L == NULL) {
error("Could not create LUA state.");
return;
}
luaL_openlibs(L);
lua_pushlightuserdata(L, this); // Push the pointer to 'this' instance
lua_setglobal(L, GLOBAL_POINTER); // Assign it to a global lua var.
lua_register(L, "getValue", _getValue);
}
LUAResume::~LUAResume()
{
lua_close(L);
}
std::string LUAResume::getValue(std::string name)
{
if(commit.fields.find(name) == commit.fields.end()) {
error("LUAResume: No such field '" + name + "'");
return "";
}
return commit.fields[name];
}
std::string LUAResume::run(std::string program)
{
if(L == NULL) {
error("LUA state not initialized!");
return false;
}
PRACRO_DEBUG(lua, "Running %s\n", program.c_str());
/*
lua_pushstring(L, value.toStdString().c_str());
lua_setglobal(L, "value");
lua_pushstring(L, name.toStdString().c_str());
lua_setglobal(L, "name");
*/
int top = lua_gettop(L);
if(luaL_loadbuffer(L, program.c_str(), program.size(), "lua resume generator")) {
error(lua_tostring(L, lua_gettop(L)));
return false;
}
// Run the loaded code
if(lua_pcall(L, 0, LUA_MULTRET, 0)) {
error(lua_tostring(L, lua_gettop(L)));
return false;
}
if(top != lua_gettop(L) - 1) {
error("Program did not return a single value.\n");
return false;
}
if(lua_isstring(L, lua_gettop(L)) == false) {
error("Program did not return a string value.\n");
return false;
}
std::string res = lua_tostring(L, lua_gettop(L));
lua_pop(L, 1);
return res;
}
void LUAResume::error(std::string message)
{
printf("LUA ERROR: %s\n", message.c_str());
}
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