libs/xml/xmlparser.h

/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined( INCLUDED_XML_XMLPARSER_H )
#define INCLUDED_XML_XMLPARSER_H

#include <cstdio>
#include <string.h>
#include "ixml.h"
#include "libxml/parser.h"
#include "convert.h"

class TextInputStream;

class SAXElement : public XMLElement
{
public:
SAXElement( const char* name, const char** atts )
	: m_name( name ), m_atts( atts ){
}
const char* name() const {
	return m_name;
}
const char* attribute( const char* name ) const {
	if ( m_atts != 0 ) {
		for ( const char** att = m_atts; *att != 0; att += 2 )
		{
			if ( strcmp( *att, name ) == 0 ) {
				return *( ++att );
			}
		}
	}
	return "";
}
void forEachAttribute( XMLAttrVisitor& visitor ) const {
	if ( m_atts != 0 ) {
		for ( const char** att = m_atts; *att != 0; att += 2 )
		{
			visitor.visit( *att, *( att + 1 ) );
		}
	}
}
private:
const char* m_name;
const char** m_atts;
};

#include <stdarg.h>

class FormattedVA
{
public:
const char* m_format;
va_list& m_arguments;
FormattedVA( const char* format, va_list& m_arguments )
	: m_format( format ), m_arguments( m_arguments ){
}
};

class Formatted
{
public:
const char* m_format;
mutable va_list m_arguments;
Formatted( const char* format, ... )
	: m_format( format ){
	va_start( m_arguments, format );
}
~Formatted(){
	va_end( m_arguments );
}
};

#ifdef _MSC_VER
#if _MSC_VER < 1400
#define vsnprintf std::vsnprintf
#endif
#endif

template<typename TextOutputStreamType>
inline TextOutputStreamType& ostream_write( TextOutputStreamType& ostream, const FormattedVA& formatted ){
	char buffer[1024];
	ostream.write( buffer, vsnprintf( buffer, 1023, formatted.m_format, formatted.m_arguments ) );
	return ostream;
}

#if 0
template<typename TextOutputStreamType>
inline TextOutputStreamType& ostream_write( TextOutputStreamType& ostream, const Formatted& formatted ){
	char buffer[1024];
	ostream.write( buffer, vsnprintf( buffer, 1023, formatted.m_format, formatted.m_arguments ) );
	return ostream;
}
#endif

class XMLSAXImporter
{
XMLImporter& m_importer;
xmlSAXHandler m_sax;

static void startElement( void *user_data, const xmlChar *name, const xmlChar **atts ){
	SAXElement element( reinterpret_cast<const char*>( name ), reinterpret_cast<const char**>( atts ) );
	reinterpret_cast<XMLSAXImporter*>( user_data )->m_importer.pushElement( element );
}
static void endElement( void *user_data, const xmlChar *name ){
	reinterpret_cast<XMLSAXImporter*>( user_data )->m_importer.popElement( reinterpret_cast<const char*>( name ) );
}
static void characters( void *user_data, const xmlChar *ch, int len ){
	reinterpret_cast<XMLSAXImporter*>( user_data )->m_importer
	<< StringRange( reinterpret_cast<const char*>( ch ), reinterpret_cast<const char*>( ch + len ) );
}

static void warning( void *user_data, const char *msg, ... ){
	va_list args;
	va_start( args, msg );
	globalErrorStream() << "XML WARNING: " << FormattedVA( msg, args );
	va_end( args );
}
static void error( void *user_data, const char *msg, ... ){
	va_list args;
	va_start( args, msg );
	globalErrorStream() << "XML ERROR: " << FormattedVA( msg, args );
	va_end( args );
}

public:
XMLSAXImporter( XMLImporter& importer ) : m_importer( importer ){
	m_sax.internalSubset = 0;
	m_sax.isStandalone = 0;
	m_sax.hasInternalSubset = 0;
	m_sax.hasExternalSubset = 0;
	m_sax.resolveEntity = 0;
	m_sax.getEntity = 0;
	m_sax.entityDecl = 0;
	m_sax.notationDecl = 0;
	m_sax.attributeDecl = 0;
	m_sax.elementDecl = 0;
	m_sax.unparsedEntityDecl = 0;
	m_sax.setDocumentLocator = 0;
	m_sax.startDocument = 0;
	m_sax.endDocument = 0;
	m_sax.startElement = startElement;
	m_sax.endElement = endElement;
	m_sax.reference = 0;
	m_sax.characters = characters;
	m_sax.ignorableWhitespace = 0;
	m_sax.processingInstruction = 0;
	m_sax.comment = 0;
	m_sax.warning = warning;
	m_sax.error = error;
	m_sax.fatalError = 0;
	m_sax.getParameterEntity = 0;
	m_sax.cdataBlock = 0;
	m_sax.externalSubset = 0;
	m_sax.initialized = 1;
}

xmlSAXHandler* callbacks(){
	return &m_sax;
}
void* context(){
	return this;
}
};

class XMLStreamParser : public XMLExporter
{
enum unnamed0 { BUFSIZE = 1024 };
public:
XMLStreamParser( TextInputStream& istream )
	: m_istream( istream ){
}
virtual void exportXML( XMLImporter& importer ){
	bool wellFormed = false;

	char chars[BUFSIZE];
	std::size_t res = m_istream.read( chars, 4 );
	if ( res > 0 ) {
		XMLSAXImporter sax( importer );

		xmlParserCtxtPtr ctxt = xmlCreatePushParserCtxt( sax.callbacks(), sax.context(), chars, static_cast<int>( res ), 0 );
		ctxt->replaceEntities = 1;

		while ( ( res = m_istream.read( chars, BUFSIZE ) ) > 0 )
		{
			xmlParseChunk( ctxt, chars, static_cast<int>( res ), 0 );
		}
		xmlParseChunk( ctxt, chars, 0, 1 );

		wellFormed = ( ctxt->wellFormed == 1 );

		xmlFreeParserCtxt( ctxt );
	}

	//return wellFormed;
}
private:
TextInputStream& m_istream;
};


#endif