xml_tokenizer.cpp

khtml在gtk上的移植版本

/**
 * This file is part of the DOM implementation for KDE.
 *
 * Copyright (C) 2000 Peter Kelly ([e-mail])
 * Copyright (C) 2003 Apple Computer, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */


#include "xml_tokenizer.h"
#include "xml/dom_docimpl.h"
#include "xml/dom_textimpl.h"
#include "xml/dom_xmlimpl.h"
#include "html/html_headimpl.h"
#ifdef KWIQ
#include "html/html_tableimpl.h"
#endif
#include "rendering/render_object.h"
#include "misc/htmltags.h"
#include "misc/htmlattrs.h"
#include "misc/loader.h"


#include "khtmlview.h"
#include "khtml_part.h"
#include <qvariant.h>
#include <kdebug.h>
#include <klocale.h>

// Commented out for testing - psalmi
// #ifdef KWIQ //FIXME: Why HTMLTableSectionElement is not found (webcore-106 import)
// #include "html/html_tableimpl.h"
// #endif
using namespace DOM;

namespace khtml {

const int maxErrors = 25;

XMLHandler::XMLHandler(DocumentPtr *_doc, KHTMLView *_view)
    : errorLine(0), m_errorCount(0)
{
    m_doc = _doc;
    if ( m_doc ) m_doc->ref();
    m_view = _view;
    m_currentNode = _doc->document();
}


XMLHandler::~XMLHandler()
{
    if ( m_doc ) m_doc->deref();
}


QString XMLHandler::errorProtocol()
{
    return errorProt;
}


bool XMLHandler::startDocument()
{
    // at the beginning of parsing: do some initialization
    errorProt = "";
    m_errorCount = 0;
    state = StateInit;

    return true;
}


bool XMLHandler::startElement( const QString& namespaceURI, const QString& /*localName*/, const QString& qName, const QXmlAttributes& atts )
{
    if (m_errorCount) return true;
    
    if (m_currentNode->nodeType() == Node::TEXT_NODE)
        exitText();

    int exceptioncode = 0;
    ElementImpl *newElement = m_doc->document()->createElementNS(namespaceURI,qName,exceptioncode);
    if (!newElement)
        return false;

    int i;
    for (i = 0; i < atts.length(); i++) {
        // FIXME: qualified name not supported for attributes! The prefix has been lost.
        DOMString uri(atts.uri(i));
        DOMString ln(atts.localName(i));
        DOMString val(atts.value(i));
        NodeImpl::Id id = m_doc->document()->attrId(uri.implementation(),
                                                    ln.implementation(),
                                                    false /* allocate */);
        newElement->setAttribute(id, val.implementation(), exceptioncode);
        if (exceptioncode) // exception setting attributes
            return false;
    }

    // FIXME: This hack ensures implicit table bodies get constructed in XHTML and XML files.
    // We want to consolidate this with the HTML parser and HTML DOM code at some point.
    // For now, it's too risky to rip that code up.
    if (m_currentNode->id() == ID_TABLE &&
        newElement->id() == ID_TR &&
        m_currentNode->isHTMLElement() && newElement->isHTMLElement()) {
        NodeImpl* implicitTBody =
           new HTMLTableSectionElementImpl ( m_doc, ID_TBODY, true /* implicit */ );
        m_currentNode->addChild(implicitTBody);
        if (m_view && !implicitTBody->attached())
            implicitTBody->attach();
        m_currentNode = implicitTBody;
    }

    if (m_currentNode->addChild(newElement)) {
        if (m_view && !newElement->attached())
            newElement->attach();
        m_currentNode = newElement;
        return true;
    }
    else {
        
        delete newElement;
        return false;
    }

    // ### DOM spec states: "if there is no markup inside an element's content, the text is contained in a
    // single object implementing the Text interface that is the only child of the element."... do we
    // need to ensure that empty elements always have an empty text child?
}


bool XMLHandler::endElement( const QString& /*namespaceURI*/, const QString& /*localName*/, const QString& /*qName*/ )
{
    if (m_errorCount) return true;
    
    if (m_currentNode->nodeType() == Node::TEXT_NODE)
        exitText();
    if (m_currentNode->parentNode() != 0) {
        m_currentNode->closeRenderer();
        do {
            m_currentNode = m_currentNode->parentNode();
        } while (m_currentNode && m_currentNode->implicitNode());
    }
// ###  else error

    return true;
}


bool XMLHandler::startCDATA()
{
    if (m_errorCount) return true;
    
    if (m_currentNode->nodeType() == Node::TEXT_NODE)
        exitText();

    NodeImpl *newNode = m_doc->document()->createCDATASection("");
    if (m_currentNode->addChild(newNode)) {
        if (m_view && !newNode->attached())
            newNode->attach();
        m_currentNode = newNode;
        return true;
    }
    else {
        delete newNode;
        return false;
    }

}

bool XMLHandler::endCDATA()
{
    if (m_errorCount) return true;
    
    if (m_currentNode->parentNode() != 0)
        m_currentNode = m_currentNode->parentNode();
    return true;
}

bool XMLHandler::characters( const QString& ch )
{
    if (m_errorCount) return true;
    
    if (m_currentNode->nodeType() == Node::TEXT_NODE ||
        m_currentNode->nodeType() == Node::CDATA_SECTION_NODE ||
        enterText()) {

        int exceptioncode = 0;
        static_cast<TextImpl*>(m_currentNode)->appendData(ch,exceptioncode);
        if (exceptioncode)
            return false;
        return true;
    }
    else
        return false;
}

bool XMLHandler::comment(const QString & ch)
{
    if (m_errorCount) return true;
    
    if (m_currentNode->nodeType() == Node::TEXT_NODE)
        exitText();
    // ### handle exceptions
    m_currentNode->addChild(m_doc->document()->createComment(ch));
    return true;
}

bool XMLHandler::processingInstruction(const QString &target, const QString &data)
{
    if (m_errorCount) return true;
    
    if (m_currentNode->nodeType() == Node::TEXT_NODE)
        exitText();
    // ### handle exceptions
    ProcessingInstructionImpl *pi = m_doc->document()->createProcessingInstruction(target,data);
    m_currentNode->addChild(pi);
    // don't load stylesheets for standalone documents
    if (m_doc->document()->part()) {
	pi->checkStyleSheet();
    }
    return true;
}


QString XMLHandler::errorString()
{
#if APPLE_CHANGES
    // FIXME: Does the user ever see this?
    return "error";
#else
    return i18n("the document is not in the correct file format");
#endif
}

bool XMLHandler::warning( const QXmlParseException& exception )
{
#if APPLE_CHANGES
    errorProt += QString("warning on line %2 at column %3: %1")
#else
    errorProt += i18n( "warning: %1 in line %2, column %3\n" )
#endif
        .arg( exception.message() )
        .arg( exception.lineNumber() )
        .arg( exception.columnNumber() );
    
    errorLine = exception.lineNumber();
    errorCol = exception.columnNumber();
    
    return true;
}

bool XMLHandler::error( const QXmlParseException& exception )
{
    if (m_errorCount >= maxErrors) return true;
    
    if (errorLine == exception.lineNumber() && errorCol == exception.columnNumber())
        return true; // Only report 1 error for any given line/col position to reduce noise.
    
    m_errorCount++;
    
#if APPLE_CHANGES
    errorProt += QString("error on line %2 at column %3: %1")
#else