xs-native.cpp

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 //
 // XML storage C++ classes version 1.3
 //
 // Copyright (c) 2006, 2007, 2008, 2009 Martin Fuchs <martin-fuchs@gmx.net>
 //



/*

  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.

*/

#include <precomp.h>

#ifndef XS_NO_COMMENT
#define XS_NO_COMMENT   // no #pragma comment(lib, ...) statements in .lib files to enable static linking
#endif

//#include "xmlstorage.h"


#if !defined(XS_USE_EXPAT) && !defined(XS_USE_XERCES)

namespace XMLStorage {


XMLReaderBase::~XMLReaderBase()
{
}

void XMLReaderBase::read()
{
    if (!parse()) {
        XMLError error;

        error._message = "XML parsing error";
        //error._line = ;
        //error._column = ;

        _errors.push_back(error);
    }

    finish_read();
}



struct Buffer
{
    Buffer()
    {
        _buffer = (char*) malloc(BUFFER_LEN);
        _len = BUFFER_LEN;

        reset();
    }

    ~Buffer()
    {
        free(_buffer);
    }

    void reset()
    {
        _wptr = _buffer;
        _buffer_str.erase();
    }

    void append(int c)
    {
        size_t wpos = _wptr-_buffer;

        if (wpos >= _len) {
            _len <<= 1;
            _buffer = (char*) realloc(_buffer, _len);
            _wptr = _buffer + wpos;
        }

        *_wptr++ = static_cast<char>(c);
    }

    const std::string& str(bool utf8)   // returns UTF-8 encoded buffer content
    {
#if defined(_WIN32) && !defined(XS_STRING_UTF8)
        if (utf8)
#endif
            _buffer_str.assign(_buffer, _wptr-_buffer);
#if defined(_WIN32) && !defined(XS_STRING_UTF8)
        else
            _buffer_str = get_utf8(_buffer, _wptr-_buffer);
#endif

        return _buffer_str;
    }

    size_t len() const
    {
        return _wptr - _buffer;
    }

    bool has_CDEnd() const
    {
        //if (_wptr-_buffer < 3)
        //  return false;

        return !strncmp(_wptr-3, CDATA_END, 3);
    }

    XS_String get_tag() const
    {
        const char* p = _buffer_str.c_str();

        if (*p == '<')
            ++p;

        if (*p == '/')
            ++p;

        const char* q = p;

        if (*q == '?')
            ++q;

        q = get_xmlsym_end_utf8(q);

#ifdef XS_STRING_UTF8
        return XS_String(p, q-p);
#else
        XS_String tag;
        assign_utf8(tag, p, q-p);
        return tag;
#endif
    }

    void get_attributes(XMLNode::AttributeMap& attributes) const
    {
        const char* p = _buffer_str.c_str();

         // find end of tag name
        if (*p == '<')
            ++p;

        if (*p == '/')
            ++p;
        else if (*p == '?')
            ++p;

        p = get_xmlsym_end_utf8(p);

         // read attributes from buffer
        while(*p && *p!='>' && *p!='/') {
            while(isspace((unsigned char)*p))
                ++p;

            const char* attr_name = p;

            p = get_xmlsym_end_utf8(p);

            if (*p != '=')
                break;  //@TODO error handling

            size_t attr_len = p - attr_name;

            if (*++p!='"' && *p!='\'')
                break;  //@TODO error handling

            char delim = *p;
            const char* value = ++p;

            while(*p && *p!=delim)
                ++p;

            size_t value_len = p - value;

            if (*p)
                ++p;    // '"'

#ifdef XS_STRING_UTF8
            XS_String name_str(attr_name, attr_len);
#else
            XS_String name_str;
            assign_utf8(name_str, attr_name, attr_len);
#endif

            attributes[name_str] = DecodeXMLString(std::string(value, value_len));
        }
    }

protected:
    char*   _buffer;
    char*   _wptr;
    size_t  _len;
    std::string _buffer_str;    // UTF-8 encoded
};

bool XMLReaderBase::parse()
{
    Buffer buffer;
    int c = get();
    bool in_comment = false;

    while(c != EOF) {
        if (in_comment || c=='<') {
            buffer.append(c);

             // read start or end tag
            for(;;) {
                c = get();

                if (c == EOF)
                    break;

                buffer.append(c);

                if (c == '>')
                    break;
            }

            const std::string& b = buffer.str(_utf8);
            const char* str = b.c_str();

            if (in_comment || !strncmp(str+1, "!--", 3)) {
                 // XML comment
                DefaultHandler(b);

                if (strcmp(str+b.length()-3, "-->"))
                    in_comment = true;
                else
                    in_comment = false;

                c = get();
            } else if (str[1] == '/') {
                 // end tag

                /*@TODO error handling
                const XS_String& tag = buffer.get_tag();

                    if (tag != last_opened_tag) {
                        ERROR
                    }
                */

                EndElementHandler();

                c = get();
            } else if (str[1] == '?') {
                 // XML declaration
                const XS_String& tag = buffer.get_tag();

                if (tag == "?xml") {
                    XMLNode::AttributeMap attributes;
                    buffer.get_attributes(attributes);

                    const std::string& version = attributes.get("version");
                    const std::string& encoding = attributes.get("encoding");

                    int standalone;
                    XMLNode::AttributeMap::const_iterator found =   // const_cast for ISO C++ compatibility error of GCC
                            const_cast<const XMLNode::AttributeMap&>(attributes).find("standalone");
                    if (found != attributes.end())
                        standalone = !XS_icmp(found->second.c_str(), XS_TEXT("yes"));
                    else
                        standalone = -1;

                    XmlDeclHandler(version.empty()?NULL:version.c_str(), encoding.empty()?NULL:encoding.c_str(), standalone);

                    if (!encoding.empty() && !_stricmp(encoding.c_str(), "utf-8"))
                        _utf8 = true;

                    c = eat_endl();
                } else if (tag == "?xml-stylesheet") {
                    XMLNode::AttributeMap attributes;
                    buffer.get_attributes(attributes);

                    StyleSheet stylesheet(attributes.get("href"), attributes.get("type"), !XS_icmp(attributes.get("alternate"), XS_TEXT("yes")));
                    stylesheet._title = attributes.get("title");
                    stylesheet._media = attributes.get("media");
                    stylesheet._charset = attributes.get("charset");

                    _format._stylesheets.push_back(stylesheet);

                    c = eat_endl();
                } else {
                    DefaultHandler(b);
                    c = get();
                }
            } else if (str[1] == '!') {
                if (!strncmp(str+2, "DOCTYPE ", 8)) {
                    _format._doctype.parse(str+10);

                    c = eat_endl();
                } else if (!strncmp(str+2, "[CDATA[", 7)) { // see CDATA_START
                     // parse <![CDATA[ ... ]]> strings
                    while(!buffer.has_CDEnd()) {
                        c = get();

                        if (c == EOF)
                            break;

                        buffer.append(c);
                    }

                    DefaultHandler(buffer.str(_utf8));

                    c = get();
                }
            } else {
                 // start tag
                const XS_String& tag = buffer.get_tag();

                if (!tag.empty()) {
                    XMLNode::AttributeMap attributes;
                    buffer.get_attributes(attributes);

                    StartElementHandler(tag, attributes);

                    if (str[b.length()-2] == '/')
                        EndElementHandler();
                }

                c = get();
            }
        } else {
            buffer.append(c);

             // read white space
            for(;;) {
                 // check for the encoding of the first line end
                if (!_endl_defined) {
                    if (c == '\n') {
                        _format._endl = "\n";
                        _endl_defined = true;
                    } else if (c == '\r') {
                        _format._endl = "\r\n";
                        _endl_defined = true;
                    }
                }

                c = get();

                if (c == EOF)
                    break;

                if (c == '<')
                    break;

                buffer.append(c);
            }

            DefaultHandler(buffer.str(_utf8));
        }

        buffer.reset();
    }

    return true; //TODO return false on invalid XML
}

int XMLReaderBase::eat_endl()
{
    int c = get();

    if (c == '\r')
        c = get();

    if (c == '\n')
        c = get();

    return c;
}

std::string XMLReaderBase::get_position() const
{
/*@TODO display parser position in case of errors
    int line = XML_GetCurrentLineNumber(_parser);
    int column = XML_GetCurrentColumnNumber(_parser);

    std::ostringstream out;
    out << "(" << line << ") : [column " << column << "]";

    return out.str();
*/
    return "";
}


#ifdef XMLNODE_LOCATION

XMLLocation XMLReaderBase::get_location() const
{
    return XMLLocation();   //@TODO XMLLocation for XS-native
}

std::string XMLLocation::str() const
{
    return "";  //TODO
}

#endif


void XMLReaderBase::DefaultHandler(const std::string& s)
{
    _content.append(s);
}


}   // namespace XMLStorage

#endif // !defined(XS_USE_EXPAT) && !defined(XS_USE_XERCES)