axmol/cocos/scripting/lua-bindings/manual/Cocos2dxLuaLoader.cpp

/****************************************************************************
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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****************************************************************************/
#include "Cocos2dxLuaLoader.h"
#include <string>
#include <algorithm>

#include "CCLuaStack.h"
#include "CCLuaEngine.h"

using namespace cocos2d;

extern "C"
{
    int cocos2dx_lua_loader(lua_State *L)
    {
        static const std::string BYTE_FILE_EXT    = ".luac";
        static const std::string NO_BYTE_FILE_EXT = ".lua";
        
        std::string filename(luaL_checkstring(L, 1));
        size_t pos = filename.rfind(NO_BYTE_FILE_EXT);
        if (pos != std::string::npos)
        {
            filename = filename.substr(0, pos);
        }
        
        pos = filename.find_first_of(".");
        while (pos != std::string::npos)
        {
            filename.replace(pos, 1, "/");
            pos = filename.find_first_of(".");
        }
        //filename.append(".lua");
        
        // search file in package.path
        unsigned char* chunk = NULL;
        ssize_t chunkSize = 0;
        std::string chunkName;
        FileUtils* utils = FileUtils::getInstance();
        
        lua_getglobal(L, "package");
        lua_getfield(L, -1, "path");
        std::string searchpath(lua_tostring(L, -1));
        lua_pop(L, 1);
        size_t begin = 0;
        size_t next = searchpath.find_first_of(";", 0);
        
        do
        {
            if (next == std::string::npos) next = searchpath.length();
            std::string prefix = searchpath.substr(begin, next);
            if (prefix[0] == '.' && prefix[1] == '/')
            {
                prefix = prefix.substr(2);
            }
            
            pos = prefix.find("?.lua");
            chunkName = prefix.substr(0, pos) + filename + BYTE_FILE_EXT;
            chunkName = utils->fullPathForFilename(chunkName.c_str());
            if (utils->isFileExist(chunkName))
            {
                chunk = utils->getFileData(chunkName.c_str(), "rb", &chunkSize);
                break;
            }
            else
            {
                chunkName = prefix.substr(0, pos) + filename + NO_BYTE_FILE_EXT;
                chunkName = utils->fullPathForFilename(chunkName.c_str());
                if (utils->isFileExist(chunkName))
                {
                    chunk = utils->getFileData(chunkName.c_str(), "rb", &chunkSize);
                    break;
                }
            }
            
            begin = next + 1;
            next = searchpath.find_first_of(";", begin);
        } while (begin < (int)searchpath.length());
        
        if (chunk)
        {
            LuaStack* stack = LuaEngine::getInstance()->getLuaStack();
            stack->lua_loadbuffer(L, (char*)chunk, (int)chunkSize, chunkName.c_str());
            delete []chunk;
        }
        else
        {
            log("can not get file data of %s", chunkName.c_str());
            return 0;
        }
        
        return 1;
    }
}