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WhitespaceFilter.cpp

//
// WhitespaceFilter.cpp
//
// $Id: //poco/1.2/XML/src/WhitespaceFilter.cpp#1 $
//
// Library: XML
// Package: SAX
// Module:  WhitespaceFilter
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// 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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/SAX/WhitespaceFilter.h"
#include "Poco/SAX/SAXException.h"


namespace Poco {
namespace XML {


WhitespaceFilter::WhitespaceFilter():
      _pLexicalHandler(0),
      _filter(true)
{
}

      
00052 WhitespaceFilter::WhitespaceFilter(XMLReader* pReader): 
      XMLFilterImpl(pReader),
      _pLexicalHandler(0),
      _filter(true)
{
}


00060 WhitespaceFilter::~WhitespaceFilter()
{
}


00065 void WhitespaceFilter::setProperty(const XMLString& propertyId, const XMLString& value)
{
      if (propertyId == XMLReader::PROPERTY_LEXICAL_HANDLER)
            throw SAXNotSupportedException(std::string("property does not take a string value: ") + fromXMLString(propertyId));
      else
            XMLFilterImpl::setProperty(propertyId, value);

}


00075 void WhitespaceFilter::setProperty(const XMLString& propertyId, void* value)
{
      if (propertyId == XMLReader::PROPERTY_LEXICAL_HANDLER)
            _pLexicalHandler = reinterpret_cast<LexicalHandler*>(value);
      else
            XMLFilterImpl::setProperty(propertyId, value);
}


00084 void* WhitespaceFilter::getProperty(const XMLString& propertyId) const
{
      if (propertyId == XMLReader::PROPERTY_LEXICAL_HANDLER)
            return _pLexicalHandler;
      else
            return XMLFilterImpl::getProperty(propertyId);
}


00093 void WhitespaceFilter::startDocument()
{
      XMLFilterImpl::startDocument();
      _filter = true;
      _data.clear();
}


00101 void WhitespaceFilter::endDocument()
{
      XMLFilterImpl::endDocument();
      _filter = true;
      _data.clear();
}


00109 void WhitespaceFilter::startElement(const XMLString& uri, const XMLString& localName, const XMLString& qname, const Attributes& attrList)
{
      XMLFilterImpl::startElement(uri, localName, qname, attrList);
      _filter = true;
      _data.clear();
}


00117 void WhitespaceFilter::endElement(const XMLString& uri, const XMLString& localName, const XMLString& qname)
{
      XMLFilterImpl::endElement(uri, localName, qname);
      _filter = true;
      _data.clear();
}


00125 void WhitespaceFilter::characters(const XMLChar ch[], int start, int length)
{
      if (_filter)
      {
            bool ws = true;
            const XMLChar* it  = ch + start;
            const XMLChar* end = ch + start + length;
            _data.append(it, end);
            while (it != end)
            {
                  if (*it != '\r' && *it != '\n' && *it != '\t' && *it != ' ')
                  {
                        ws = false;
                        break;
                  }
                  ++it;
            }
            if (!ws)
            {
                  XMLFilterImpl::characters(_data.data(), 0, (int) _data.length());
                  _filter = false;
                  _data.clear();    
            }
      }
      else XMLFilterImpl::characters(ch, start, length);
}


00153 void WhitespaceFilter::ignorableWhitespace(const XMLChar ch[], int start, int length)
{
      // the handler name already says that this data can be ignored
}


00159 void WhitespaceFilter::processingInstruction(const XMLString& target, const XMLString& data)
{
      XMLFilterImpl::processingInstruction(target, data);
      _filter = true;
      _data.clear();
}


void WhitespaceFilter::startDTD(const XMLString& name, const XMLString& publicId, const XMLString& systemId)
{
      if (_pLexicalHandler)
            _pLexicalHandler->startDTD(name, publicId, systemId);
}


00174 void WhitespaceFilter::endDTD()
{
      if (_pLexicalHandler)
            _pLexicalHandler->endDTD();
}


00181 void WhitespaceFilter::startEntity(const XMLString& name)
{
      if (_pLexicalHandler)
            _pLexicalHandler->startEntity(name);
      _filter = true;
      _data.clear();
}


00190 void WhitespaceFilter::endEntity(const XMLString& name)
{
      if (_pLexicalHandler)
            _pLexicalHandler->endEntity(name);
      _filter = true;
      _data.clear();
}


00199 void WhitespaceFilter::startCDATA()
{
      if (_pLexicalHandler)
            _pLexicalHandler->startCDATA();
      _filter = false;
      _data.clear();
}


00208 void WhitespaceFilter::endCDATA()
{
      if (_pLexicalHandler)
            _pLexicalHandler->endCDATA();
      _filter = true;
      _data.clear();
}


00217 void WhitespaceFilter::comment(const XMLChar ch[], int start, int length)
{
      if (_pLexicalHandler)
            _pLexicalHandler->comment(ch, start, length);
      _filter = true;
      _data.clear();
}


00226 void WhitespaceFilter::setupParse()
{
      XMLFilterImpl::setupParse();

      parent()->setProperty(XMLReader::PROPERTY_LEXICAL_HANDLER, static_cast<LexicalHandler*>(this));
}


} } // namespace Poco::XML

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