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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 "lua.h"
#include "macrowindow.h"
#include "widgets/widget.h"
#include "luawidget.h"
#define DEBUG(fmt...) printf("LUA (%p)", this); printf(fmt); fflush(stdout)
//#define DEBUG(ftm...)
#define GLOBAL_POINTER "_pracroGlobalLUAObjectPointerThisShouldBeANameThatIsNotAccidentallyOverwritten"
static int get_widget(lua_State *L)
{
int n = lua_gettop(L); // number of arguments
if(n != 1) {
char errstr[512];
sprintf(errstr, "Number of args expected 1, got %d", n);
lua_pushstring(L, errstr);
lua_error(L);
return 1;
}
QString name = lua_tostring(L, lua_gettop(L));
lua_getglobal(L, GLOBAL_POINTER);
LUA *lua = (LUA*)lua_touserdata(L, lua_gettop(L));
if(!lua) {
lua_pushstring(L, "No LUA pointer!");
lua_error(L);
return 1;
}
Widget *widget = lua->getWidget(name);
// DEBUG("FIND: %s (%p)\n", name.toStdString().c_str(), widget);
if(widget) {
wdg_make_widget(L, widget);
} else {
lua_pushnil(L);
}
// DEBUG("DONE\n");
return 1;
}
LUA::LUA(Widget **rootwidget)
{
this->rootwidget = rootwidget;
L = NULL;
clear();
}
LUA::~LUA()
{
lua_close(L);
}
void LUA::clear()
{
if(L) lua_close(L);
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, "widget", get_widget);
register_widget(L);
}
QString LUA::runParser(QString program)
{
if(L == NULL) {
error("LUA state not initialized!");
return false;
}
DEBUG("Running %s\n", program.toStdString().c_str());
int top = lua_gettop(L);
if(luaL_loadbuffer(L,
program.toStdString().c_str(),
program.size(),
"parser")) {
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 boolean value.\n");
return false;
}
QString res = lua_tostring(L, lua_gettop(L));
lua_pop(L, 1);
return res;
}
bool LUA::runScript(QString script, Widget *widget, QString name)
{
if(L == NULL) {
error("LUA state not initialized!");
return false;
}
DEBUG("Running %s script %s on %s widget.\n",
name.toStdString().c_str(),
script.toStdString().c_str(),
widget?widget->name().toStdString().c_str():"NULL");
if(widget) {
wdg_make_widget(L, widget);
lua_setglobal(L, "this");
}
if(luaL_loadbuffer(L,
script.toStdString().c_str(),
script.size(),
name.toStdString().c_str())) {
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;
}
return true;
}
void LUA::error(QString message)
{
DEBUG("LUA ERROR: %s\n", message.toStdString().c_str());
}
Widget *LUA::getWidget(QString name)
{
if(*rootwidget) return (*rootwidget)->findWidget(name, true);
else return NULL;
}
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