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// ____ _ __
// / __ )____ _____ | | / /___ ___________
// / __ / __ \/ ___/ | | /| / / __ `/ ___/ ___/
// / /_/ / /_/ (__ ) | |/ |/ / /_/ / / (__ )
// /_____/\____/____/ |__/|__/\__,_/_/ /____/
//
// A futuristic real-time strategy game.
// This file is part of Bos Wars.
//
/**@name luacallback.cpp - Lua callback. */
//
// (c) Copyright 2008 by Francois Beerten
//
// This program 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; only version 2 of the License.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
//@{
#include "luacallback.h"
#include "stratagus.h"
#include "script.h"
/**
** LuaCallback constructor
**
** @param l Lua state
** @param f Listener function
*/
LuaCallback::LuaCallback(lua_State *l, lua_Object f) :
luastate(l), arguments(0)
{
if (!lua_isfunction(l, f)) {
LuaError(l, "Argument isn't a function");
Assert(0);
}
lua_pushvalue(l, f);
luaref = luaL_ref(l, LUA_REGISTRYINDEX);
}
/**
** Push the preamble on the stack to call the callback.
** Call this function before pushing the arguments on the lua stack.
*/
void LuaCallback::pushPreamble()
{
base = lua_gettop(luastate);
lua_pushcfunction(Lua, luatraceback); // at base+1
lua_rawgeti(luastate, LUA_REGISTRYINDEX, luaref); // at base+2
arguments = 0;
}
/**
** Push a string argument for the callback on the stack.
**
** @param value the integer to push on the stack
*/
void LuaCallback::pushInteger(int value)
{
lua_pushnumber(luastate, value);
arguments++;
}
/**
** Push a string argument for the callback on the stack.
**
** @param s the string to push on the stack
*/
void LuaCallback::pushString(const std::string &s)
{
lua_pushstring(luastate, s.c_str());
arguments++;
}
/**
** Called when an action is recieved from a Widget. It is used
** to be able to recieve a notification that an action has
** occured.
*/
void LuaCallback::run()
{
int status;
//FIXME call error reporting function
status = lua_pcall(luastate, arguments, 0, base + 1);
if (status) {
const char *msg;
msg = lua_tostring(luastate, -1);
if (msg == NULL) {
msg = "(error with no message)";
}
fprintf(stderr, "%s\n", msg);
lua_pop(luastate, 1);
}
}
/**
** LuaActionListener destructor
*/
LuaCallback::~LuaCallback()
{
luaL_unref(luastate, LUA_REGISTRYINDEX, luaref);
}
//@}
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