axmol/core/platform/CCSAXParser.cpp

/****************************************************************************
 Copyright (c) 2010 Максим Аксенов
 Copyright (c) 2010 cocos2d-x.org
 Copyright (c) 2013 Martell Malone
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 Copyright (c) 2019-2020 simdsoft.com, @HALX99

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 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
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/

#include "platform/CCSAXParser.h"

#include <vector>  // because its based on windows 8 build :P

#include "platform/CCFileUtils.h"
#include "xsbase/xsxml/xsxml.hpp"

NS_AX_BEGIN

/// xsxml SAX2 handler
class SAX2Hander
{
    friend class SAXParser;

public:
    SAX2Hander() : _ccsaxParserImp(0)
    {
        _curEleAttrs.reserve(64);

        _sax3Handler.xml_start_element_cb = [=](char* name, size_t size) {
            _curEleName = xsxml::string_view(name, size);
        };
        _sax3Handler.xml_attr_cb = [=](const char* name, size_t, const char* value, size_t) {
            _curEleAttrs.emplace_back(name);
            _curEleAttrs.emplace_back(value);
        };
        _sax3Handler.xml_end_attr_cb = [=]() {
            if (!_curEleAttrs.empty())
            {
                _curEleAttrs.emplace_back(nullptr);
                SAXParser::startElement(_ccsaxParserImp, (const AX_XML_CHAR*)_curEleName.c_str(),
                                        (const AX_XML_CHAR**)&_curEleAttrs[0]);
                _curEleAttrs.clear();
            }
            else
            {
                const char* attr   = nullptr;
                const char** attrs = &attr;
                SAXParser::startElement(_ccsaxParserImp, (const AX_XML_CHAR*)_curEleName.c_str(),
                                        (const AX_XML_CHAR**)attrs);
            }
        };
        _sax3Handler.xml_end_element_cb = [=](const char* name, size_t len) {
            SAXParser::endElement(_ccsaxParserImp, (const AX_XML_CHAR*)name);
        };
        _sax3Handler.xml_text_cb = [=](const char* s, size_t len) {
            SAXParser::textHandler(_ccsaxParserImp, (const AX_XML_CHAR*)s, len);
        };
    };

    void setSAXParserImp(SAXParser* parser) { _ccsaxParserImp = parser; }

    operator xsxml::xml_sax3_parse_cb*() { return &_sax3Handler; }

private:
    SAXParser* _ccsaxParserImp;
    xsxml::string_view _curEleName;
    std::vector<const char*> _curEleAttrs;
    xsxml::xml_sax3_parse_cb _sax3Handler;
};

SAXParser::SAXParser()
{
    _delegator = nullptr;
}

SAXParser::~SAXParser() {}

bool SAXParser::init(const char* /*encoding*/)
{
    // nothing to do
    return true;
}

bool SAXParser::parse(const char* xmlData, size_t dataLength)
{
    if (xmlData != nullptr && dataLength > 0)
    {
        std::string mutableData(xmlData, dataLength);
        return this->parseIntrusive(&mutableData.front(), dataLength);
    }
    return false;
}

bool SAXParser::parse(std::string_view filename)
{
    bool ret  = false;
    Data data = FileUtils::getInstance()->getDataFromFile(filename);
    if (!data.isNull())
    {
        ret = parseIntrusive((char*)data.getBytes(), data.getSize());
    }

    return ret;
}

bool SAXParser::parseIntrusive(char* xmlData, size_t dataLength)
{
    SAX2Hander handler;
    handler.setSAXParserImp(this);

    try
    {
        xsxml::xml_sax3_parser::parse(xmlData, static_cast<int>(dataLength), handler);
        return true;
    }
    catch (xsxml::parse_error& e)
    {
        AXLOG("axmol: SAXParser: Error parsing xml: %s at %s", e.what(), e.where<char>());
        return false;
    }

    return false;
}

void SAXParser::startElement(void* ctx, const AX_XML_CHAR* name, const AX_XML_CHAR** atts)
{
    ((SAXParser*)(ctx))->_delegator->startElement(ctx, (char*)name, (const char**)atts);
}

void SAXParser::endElement(void* ctx, const AX_XML_CHAR* name)
{
    ((SAXParser*)(ctx))->_delegator->endElement(ctx, (char*)name);
}
void SAXParser::textHandler(void* ctx, const AX_XML_CHAR* name, size_t len)
{
    ((SAXParser*)(ctx))->_delegator->textHandler(ctx, (char*)name, len);
}
void SAXParser::setDelegator(SAXDelegator* delegator)
{
    _delegator = delegator;
}

NS_AX_END