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/*
* Smart Auto Replier (SAR) - auto replier plugin for Miranda IM
*
* Copyright (C) 2004 - 2012 by Volodymyr M. Shcherbyna <volodymyr@shcherbyna.com>
*
* This code is inspired by article of RichardS at http://www.codeproject.com/Articles/11508/Integrating-Lua-into-C
*
* This file is part of SAR.
*
* SAR 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.
*
* SAR 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 SAR. If not, see <http://www.gnu.org/licenses/>.
*/
#include "stdafx.h"
#include <assert.h>
#include "luainc.h"
#include "luascript.h"
#define LUA_CODE_CHUNK_ENTER(luaBridge) lua_State *state = (lua_State*)luaBridge;
#define LUA_CODE_CHUNK_LEAVE
CLuaScript::CLuaScript(CLuaBridge & luaBridge) : m_luaBridge(luaBridge), m_nMethods(DEFAULT_INDEX_INITIALIZER), m_nThisRef(DEFAULT_INDEX_INITIALIZER), m_nArgs(DEFAULT_INDEX_INITIALIZER)
{
LUA_CODE_CHUNK_ENTER(luaBridge)
lua_newtable(state);
m_nThisRef = luaL_ref(state, LUA_REGISTRYINDEX);
CLuaStack luaStack(luaBridge);
lua_rawgeti(state, LUA_REGISTRYINDEX, m_nThisRef);
lua_pushlightuserdata(state, reinterpret_cast<void*>(this));
lua_rawseti(state, -2, 0);
LUA_CODE_CHUNK_LEAVE
}
CLuaScript::~CLuaScript(void)
{
CLuaStack luaStack(m_luaBridge);
LUA_CODE_CHUNK_ENTER(m_luaBridge)
lua_rawgeti(state, LUA_REGISTRYINDEX, m_nThisRef);
lua_pushnil(state);
lua_rawseti(state, -2, 0);
LUA_CODE_CHUNK_LEAVE
}
int CLuaScript::LuaCallback(lua_State *lua)
{
int iNumberIdx = lua_upvalueindex(1);
int nRetsOnStack = 0;
bool bRetVal = false;
if (lua_istable(lua, 1))
{
lua_rawgeti(lua, 1, 0);
if (lua_islightuserdata(lua, -1))
{
CLuaScript *pThis = reinterpret_cast<CLuaScript*>(lua_touserdata(lua, -1));
int nMethod = static_cast<int>(lua_tonumber(lua, iNumberIdx));
assert(!(nMethod > pThis->MethodsCount()));
lua_remove(lua, 1); lua_remove(lua, -1);
nRetsOnStack = pThis->ScriptCalling(pThis->Bridge(), nMethod);
bRetVal = true;
}
}
if (bRetVal == false)
{
lua_error(lua);
}
return nRetsOnStack;
}
bool CLuaScript::CompileScript(const char *szScript, size_t nLength)
{
CLuaTableThis luaThisTable(m_luaBridge, m_nThisRef);
return m_luaBridge.RunScript(szScript, nLength);
}
int CLuaScript::RegisterFunction(const char *szFuncName)
{
int nMethod = -1;
CLuaStack luaStack(m_luaBridge);
LUA_CODE_CHUNK_ENTER(m_luaBridge)
nMethod = ++m_nMethods;
lua_rawgeti(state, LUA_REGISTRYINDEX, m_nThisRef);
lua_pushstring(state, szFuncName);
lua_pushnumber(state, (lua_Number)nMethod);
lua_pushcclosure(state, CLuaScript::LuaCallback, 1);
lua_settable(state, -3);
LUA_CODE_CHUNK_LEAVE
return nMethod;
}
bool CLuaScript::SelectScriptFunction(const char *szFunction)
{
bool bRetVal = true;
LUA_CODE_CHUNK_ENTER(m_luaBridge)
lua_rawgeti(state, LUA_REGISTRYINDEX, m_nThisRef);
lua_pushstring(state, szFunction);
lua_rawget(state, -2);
lua_remove(state, -2);
lua_rawgeti(state, LUA_REGISTRYINDEX, m_nThisRef);
if (!lua_isfunction(state, -2))
{
bRetVal = false;
lua_pop(state, 2);
}
else
{
m_nArgs = 0;
m_szFunction = szFunction;
}
LUA_CODE_CHUNK_LEAVE
return bRetVal;
}
bool CLuaScript::ScriptHasFunction(const char * szFunction)
{
CLuaStack luaStack(m_luaBridge);
bool bRetVal = false;
LUA_CODE_CHUNK_ENTER(m_luaBridge)
lua_rawgeti(state, LUA_REGISTRYINDEX, m_nThisRef);
lua_pushstring(state, szFunction);
lua_rawget(state, -2);
lua_remove(state, -2);
bRetVal = (lua_isfunction(state, -1) != FALSE);
LUA_CODE_CHUNK_LEAVE
return bRetVal;
}
void CLuaScript::AddParam(char * szValue)
{
LUA_CODE_CHUNK_ENTER(m_luaBridge)
lua_pushstring(state, szValue); ++m_nArgs;
LUA_CODE_CHUNK_LEAVE
}
void CLuaScript::AddParam(int nValue)
{
LUA_CODE_CHUNK_ENTER(m_luaBridge)
lua_pushnumber(state, (lua_Number)nValue); ++m_nArgs;
LUA_CODE_CHUNK_LEAVE
}
void CLuaScript::AddParam(float fValue)
{
LUA_CODE_CHUNK_ENTER(m_luaBridge)
lua_pushnumber(state, (lua_Number)fValue); ++m_nArgs;
LUA_CODE_CHUNK_LEAVE
}
bool CLuaScript::Run(int nRetValues)
{
bool bRetVal = m_luaBridge.ExecuteFunction((m_nArgs + 1), nRetValues);
if (bRetVal == true && nRetValues > 0)
{
HandleReturns(m_luaBridge, m_szFunction);
lua_pop(static_cast<lua_State*>(m_luaBridge), nRetValues);
}
return bRetVal;
}
CLuaBridge & CLuaScript::Bridge()
{
return m_luaBridge;
}
int CLuaScript::MethodsCount()
{
return m_nMethods;
}
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