rainmeter-studio/Library/lua/LuaScript.cpp

#include "../StdAfx.h"
#include "LuaScript.h"
#include "LuaManager.h"
#include "../Rainmeter.h"

LuaScript::LuaScript(lua_State* p_pState, const char* p_strFile) : m_pState(p_pState), m_strFile(_strdup(p_strFile)),
	m_iRef(LUA_NOREF),
	m_bInitialized(true)
{
	int result = luaL_loadfile(m_pState, p_strFile);

	// If the file loaded okay.
	if (result == 0)
	{
		// Create the table this script will reside in
		lua_newtable(m_pState);

		// Create the metatable that will store the global table
		lua_createtable(m_pState, 0, 1); 
		
		// Push the global teble
		lua_pushvalue(m_pState, LUA_GLOBALSINDEX);
		
		// Set the __index of the table to be the global table
		lua_setfield(m_pState, -2, "__index");

		// Set the metatable for the script's table
		lua_setmetatable(m_pState, -2);

		// Put the table into the global table
		m_iRef = luaL_ref(m_pState, LUA_GLOBALSINDEX);

		PushTable();

		// Set the environment for the function to be run in to be the table that
		// has been created for the script/
		lua_setfenv(m_pState, -2);

		// Execute the Lua script
		result = lua_pcall(m_pState, 0, LUA_MULTRET, 0);

		if (result)
		{
			m_bInitialized = false;
			LuaManager::LuaLog(LOG_ERROR, "Script: Could not run file: %s", lua_tostring(m_pState, -1));
			lua_pop(m_pState, 1);

			luaL_unref(m_pState, LUA_GLOBALSINDEX, m_iRef);
			m_iRef = LUA_NOREF;
		}
	}
	else
	{
		m_bInitialized = false;
		LuaManager::LuaLog(LOG_ERROR, "Script: Could not run file: %s", lua_tostring(m_pState, -1));
		lua_pop(m_pState, 1);
	}
}

LuaScript::~LuaScript(void)
{
	luaL_unref(m_pState, LUA_GLOBALSINDEX, m_iRef);
	if (m_strFile) free(m_strFile);
}

void LuaScript::BindVariable(const char* p_strName, void* p_pValue, const char* p_strTypeName)
{
	PushTable();

	/*
	// Push the variable name we want to put a value in.
	lua_pushstring(m_pState, p_strName);
	// Push the value
	tolua_pushusertype(m_pState, p_pValue, p_strTypeName);
	// Bind the variable
	lua_settable(m_pState, -3);

	// Pop our table off of the stack
	lua_pop(m_pState, 1);

	*/

	// Push the variable name we want to put a value in.
	lua_pushstring(m_pState, "SKIN");
	// Push the value
	tolua_pushusertype(m_pState, p_pValue, "CMeterWindow");
	// Bind the variable
	lua_settable(m_pState, -3);

	//lua_pop(m_pLuaScript->GetState(), 1);
}

double LuaScript::RunFunctionDouble(const char* p_strFuncName)
{
	double result = -1;

	if (m_bInitialized && p_strFuncName)
	{
		// Push our table onto the stack
		PushTable();

		// Push the function onto the stack
		lua_getfield(m_pState, -1, p_strFuncName);

		if(lua_pcall(m_pState, 0, 1, 0))
		{
			LuaManager::ReportErrors(m_pState);
		}
		else
		{
			if (!lua_isnumber(m_pState, -1))
			{
				LuaManager::LuaLog(LOG_ERROR, "Script: Function '%s' must return a number: %s", p_strFuncName, m_strFile);
			}

			result = lua_tonumber(m_pState, -1);
		}

		// Pop both the table and the return value off the stack.
		lua_pop(m_pState, 2);
	}

	return result;
}

std::wstring LuaScript::RunFunctionString(const char* p_strFuncName)
{
	std::wstring result;

	if (m_bInitialized && p_strFuncName)
	{
		// Push our table onto the stack
		PushTable();

		// Push the function onto the stack
		lua_getfield(m_pState, -1, p_strFuncName);

		if (lua_pcall(m_pState, 0, 1, 0))
		{
			LuaManager::ReportErrors(m_pState);
		}
		else
		{
			if (!lua_isstring(m_pState, -1))
			{
				LuaManager::LuaLog(LOG_ERROR, "Script: Function '%s' must return a string: %s", p_strFuncName, m_strFile);
			}

			const char* str = lua_tostring(m_pState, -1);
			result = ConvertToWide(str);
		}

		// Pop both the table and the return value off the stack.
		lua_pop(m_pState, 2);
	}

	return result;
}

void LuaScript::RunFunction(const char* p_strFuncName)
{
	if (m_bInitialized && p_strFuncName)
	{
		// Push our table onto the stack
		PushTable();

		// Push the function onto the stack
		lua_getfield(m_pState,-1, p_strFuncName);

		if (lua_pcall(m_pState, 0, 0, 0))
		{
			LuaManager::ReportErrors(m_pState);
		}

		lua_pop(m_pState, 1);
	}
}

bool LuaScript::FunctionExists(const char* p_strFuncName)
{
	bool bExists = false;

	if (m_bInitialized && p_strFuncName)
	{
		// Push our table onto the stack
		PushTable();

		// Push the function onto the stack
		lua_getfield(m_pState, -1, p_strFuncName);

		if (lua_isfunction( m_pState, -1)) 
		{
			bExists = true;
		}

		// Pop both the table and the function off the stack.
		lua_pop(m_pState, 2);
	}

	return bExists;
}