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TDOMParser.cxx
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TDOMParser.cxx
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// @(#)root/xmlparser:$Id$
// Author: Jose Lo 12/4/2005
/*************************************************************************
* Copyright (C) 1995-2005, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
/**
\class TDomParser
\ingroup IO
DOM stands for the Document Object Model; this is an API for
accessing XML or HTML structured documents.
The Document Object Model is a platform and language-neutral
interface that will allow programs and scripts to dynamically
access and update the content, structure and style of documents.
The parser returns a tree built during the document analysis.
*/
#include "TDOMParser.h"
#include "TXMLDocument.h"
#include <libxml/tree.h>
#include <libxml/parserInternals.h>
ClassImp(TDOMParser);
////////////////////////////////////////////////////////////////////////////////
/// TDOMParser constructor.
TDOMParser::TDOMParser() : fTXMLDoc(0)
{
}
////////////////////////////////////////////////////////////////////////////////
/// TDOMParser destructor, it calls ReleaseUnderlying().
TDOMParser::~TDOMParser()
{
ReleaseUnderlying();
}
////////////////////////////////////////////////////////////////////////////////
/// Release any existing document.
void TDOMParser::ReleaseUnderlying()
{
if (fTXMLDoc) {
delete fTXMLDoc;
fTXMLDoc = 0;
}
SetParseCode(0);
TXMLParser::ReleaseUnderlying();
}
////////////////////////////////////////////////////////////////////////////////
/// Parse the XML file where filename is the XML file name.
/// It will create a TXMLDocument if the file is parsed without
/// any error. It returns parse code error in case of parse error,
/// see TXMLParser.
Int_t TDOMParser::ParseFile(const char *filename)
{
ReleaseUnderlying();
fContext = xmlCreateFileParserCtxt(filename);
if (!fContext) {
SetParseCode(-2);
return -2;
}
InitializeContext();
if (!fContext->directory) {
const char *dir = xmlParserGetDirectory(filename);
fContext->directory = (char *)xmlStrdup((const xmlChar *)dir);
}
return ParseContext();
}
////////////////////////////////////////////////////////////////////////////////
/// It parses a buffer, much like ParseFile().
Int_t TDOMParser::ParseBuffer(const char *buffer, Int_t len)
{
ReleaseUnderlying();
fContext = xmlCreateMemoryParserCtxt(buffer, len);
if (!fContext) {
SetParseCode(-2);
return -2;
}
InitializeContext();
return ParseContext();
}
////////////////////////////////////////////////////////////////////////////////
/// Creates a XML document for the parser.
/// It returns 0 on success, and
/// - \b -1 if no XML document was created,
/// - \b -5 if the document is not well formated,
/// - \b -6 if document is not valid.
Int_t TDOMParser::ParseContext()
{
xmlParseDocument(fContext);
if (!fContext->myDoc) {
SetParseCode(-1);
return -1;
}
if (!fContext->wellFormed) {
SetParseCode(-5);
return -5;
}
if (!fContext->valid) {
SetParseCode(-6);
return -6;
}
fTXMLDoc = new TXMLDocument(fContext->myDoc);
return 0;
}
////////////////////////////////////////////////////////////////////////////////
/// Returns the TXMLDocument.
TXMLDocument *TDOMParser::GetXMLDocument() const
{
return fTXMLDoc;
}