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

/****************************************************************************
 Copyright (c) 2011-2012 cocos2d-x.org
 Copyright (c) 2013-2017 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
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in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 "scripting/lua-bindings/manual/Cocos2dxLuaLoader.h"
#include <string>
#include <algorithm>

#include "scripting/lua-bindings/manual/CCLuaStack.h"
#include "scripting/lua-bindings/manual/CCLuaEngine.h"
#include "platform/CCFileUtils.h"

using namespace cocos2d;

extern "C"
{
    int cocos2dx_lua_loader(lua_State *L)
    {
        static const std::string BYTECODE_FILE_EXT    = ".luac";
        static const std::string NOT_BYTECODE_FILE_EXT = ".lua";

        std::string filename(luaL_checkstring(L, 1));
        size_t pos = filename.rfind(BYTECODE_FILE_EXT);
        if (pos != std::string::npos && pos == filename.length() - BYTECODE_FILE_EXT.length())
            filename = filename.substr(0, pos);
        else
        {
            pos = filename.rfind(NOT_BYTECODE_FILE_EXT);
            if (pos != std::string::npos && pos == filename.length() - NOT_BYTECODE_FILE_EXT.length())
                filename = filename.substr(0, pos);
        }

        pos = filename.find_first_of(".");
        while (pos != std::string::npos)
        {
            filename.replace(pos, 1, "/");
            pos = filename.find_first_of(".");
        }

        // search file in package.path
        Data chunk;
        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-begin);
            if (prefix[0] == '.' && prefix[1] == '/')
                prefix = prefix.substr(2);

            pos = prefix.rfind(BYTECODE_FILE_EXT);
            if (pos != std::string::npos && pos == prefix.length() - BYTECODE_FILE_EXT.length())
            {
                prefix = prefix.substr(0, pos);
            }
            else
            {
                pos = prefix.rfind(NOT_BYTECODE_FILE_EXT);
                if (pos != std::string::npos && pos == prefix.length() - NOT_BYTECODE_FILE_EXT.length())
                    prefix = prefix.substr(0, pos);
            }
            pos = prefix.find_first_of("?", 0);
            while (pos != std::string::npos)
            {
                prefix.replace(pos, 1, filename);
                pos = prefix.find_first_of("?", pos + filename.length() + 1);
            }
            chunkName = prefix + BYTECODE_FILE_EXT;
            if (utils->isFileExist(chunkName) && !utils->isDirectoryExist(chunkName))
            {
                chunk = utils->getDataFromFile(chunkName);
                break;
            }
            else
            {
                chunkName = prefix + NOT_BYTECODE_FILE_EXT;
                if (utils->isFileExist(chunkName) && !utils->isDirectoryExist(chunkName))
                {
                    chunk = utils->getDataFromFile(chunkName);
                    break;
                }
                else
                {
                    chunkName = prefix;
                    if (utils->isFileExist(chunkName) && !utils->isDirectoryExist(chunkName))
                    {
                        chunk = utils->getDataFromFile(chunkName);
                        break;
                    }
                }
            }

            begin = next + 1;
            next = searchpath.find_first_of(";", begin);
        } while (begin < searchpath.length());
        if (chunk.getSize() > 0)
        {
            LuaStack* stack = LuaEngine::getInstance()->getLuaStack();
            stack->luaLoadBuffer(L, reinterpret_cast<const char*>(chunk.getBytes()),
                                 static_cast<int>(chunk.getSize()), chunkName.c_str());
        }
        else
        {
            CCLOG("can not get file data of %s", chunkName.c_str());
            return 0;
        }

        return 1;
    }
}