dom2_traversalimpl.cpp

将konqueror浏览器移植到ARM9 2410中

/**
 * This file is part of the DOM implementation for KDE.
 *
 * (C) 1999 Lars Knoll ([e-mail])
 * (C) 2000 Frederik Holljen ([e-mail])
 * (C) 2001 Peter Kelly ([e-mail])
 *
 * 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.
 *
 * $Id: dom2_traversalimpl.cpp,v 1.9 2001/03/16 12:42:00 pmk Exp $
 */

#include "dom2_traversal.h"
#include "dom_node.h"
#include "dom_exception.h"
#include "dom2_traversalimpl.h"
#include "dom_docimpl.h"


using namespace DOM;

NodeIteratorImpl::NodeIteratorImpl(NodeImpl *_root, unsigned long _whatToShow,
				   NodeFilter _filter, bool _entityReferenceExpansion)
{
    m_root = _root;
    m_whatToShow = _whatToShow;
    m_filter = _filter;
    m_expandEntityReferences = _entityReferenceExpansion;

    m_referenceNode = _root;
    m_inFront = false;

    if (_root->nodeType() == Node::DOCUMENT_NODE)
	m_doc = static_cast<DocumentImpl*>(m_root);
    else
	m_doc = m_root->ownerDocument();
    m_doc->attachNodeIterator(this);
    m_doc->ref();

    m_detached = false;
}

NodeIteratorImpl::~NodeIteratorImpl()
{
    m_doc->detachNodeIterator(this);
    m_doc->deref();
}

NodeImpl *NodeIteratorImpl::root()
{
    return m_root;
}

unsigned long NodeIteratorImpl::whatToShow()
{
    return m_whatToShow;
}

NodeFilter NodeIteratorImpl::filter()
{
    return m_filter;
}

bool NodeIteratorImpl::expandEntityReferences()
{
    return m_expandEntityReferences;
}

NodeImpl *NodeIteratorImpl::nextNode( int &exceptioncode )
{
    if (m_detached) {
	exceptioncode = DOMException::INVALID_STATE_ERR;
	return 0;
    }

    if (!m_referenceNode) {
	m_inFront = true;
	return 0;
    }

    if (!m_inFront) {
	m_inFront = true;
	if (isAccepted(m_referenceNode) == NodeFilter::FILTER_ACCEPT)
	    return m_referenceNode;
    }

    NodeImpl *_tempCurrent = getNextNode(m_referenceNode);
    while( _tempCurrent ) {
	m_referenceNode = _tempCurrent;
	if(isAccepted(_tempCurrent) == NodeFilter::FILTER_ACCEPT)
	    return m_referenceNode;
      _tempCurrent = getNextNode(_tempCurrent);
    }

    return 0;
}

NodeImpl *NodeIteratorImpl::getNextNode(NodeImpl *n)
{
  /*  1. my first child
   *  2. my next sibling
   *  3. my parents sibling, or their parents sibling (loop)
   *  4. not found
   */

  if( !n )
    return 0;

  if( n->hasChildNodes() )
    return n->firstChild();

  if( n->nextSibling() )
    return n->nextSibling();

  if( m_root == n)
     return 0;

  NodeImpl *parent = n->parentNode();
  while( parent )
    {
      n = parent->nextSibling();
      if( n )
        return n;

      if( m_root == parent )
        return 0;

      parent = parent->parentNode();
    }
  return 0;
}

NodeImpl *NodeIteratorImpl::previousNode( int &exceptioncode )
{
    if (m_detached) {
	exceptioncode = DOMException::INVALID_STATE_ERR;
	return 0;
    }

    if (!m_referenceNode) {
	m_inFront = false;
	return 0;
    }

    if (m_inFront) {
	m_inFront = false;
	if (isAccepted(m_referenceNode) == NodeFilter::FILTER_ACCEPT)
	    return m_referenceNode;
    }

    NodeImpl *_tempCurrent = getPreviousNode(m_referenceNode);
    while( _tempCurrent ) {
	m_referenceNode = _tempCurrent;
	if(isAccepted(_tempCurrent) == NodeFilter::FILTER_ACCEPT)
	    return m_referenceNode;
	_tempCurrent = getPreviousNode(_tempCurrent);
    }

    return 0;
}

NodeImpl *NodeIteratorImpl::getPreviousNode(NodeImpl *n)
{
/* 1. my previous sibling.lastchild
 * 2. my previous sibling
 * 3. my parent
 */
  NodeImpl *_tempCurrent;

  if( !n )
    return 0;

  _tempCurrent = n->previousSibling();
  if( _tempCurrent )
    {
      if( _tempCurrent->lastChild() )
        {
          while( _tempCurrent->lastChild() )
            _tempCurrent = _tempCurrent->lastChild();
          return _tempCurrent;
        }
      else
        return _tempCurrent;
    }


  if(n == m_root)
    return 0;

  return n->parentNode();


}

void NodeIteratorImpl::detach(int &/*exceptioncode*/)
{
    m_doc->detachNodeIterator(this);
    m_detached = true;
}


void NodeIteratorImpl::notifyBeforeNodeRemoval(NodeImpl *removed)
{
    // make sure the deleted node is with the root (but not the root itself)
    if (removed == m_root)
	return;

    NodeImpl *maybeRoot = removed->parentNode();
    while (maybeRoot && maybeRoot != m_root)
	maybeRoot = maybeRoot->parentNode();
    if (!maybeRoot)
	return;

    // did I get deleted, or one of my parents?
    NodeImpl *_tempDeleted = m_referenceNode;
    while( _tempDeleted && _tempDeleted != removed)
        _tempDeleted = _tempDeleted->parentNode();

    if( !_tempDeleted )  // someone that didn't consern me got deleted
        return;

    if( !m_inFront)
    {
        NodeImpl *_next = getNextNode(_tempDeleted);
        if( _next )
            m_referenceNode = _next;
        else
        {
	    // deleted node was at end of list
            m_inFront = true;
            m_referenceNode = getPreviousNode(_tempDeleted);
        }
    }
    else {
	NodeImpl *_prev = getPreviousNode(_tempDeleted);
	if ( _prev )
	    m_referenceNode = _prev;
	else
	{
	    // deleted node was at start of list
	    m_inFront = false;
	    m_referenceNode = getNextNode(_tempDeleted);
	}
    }

}

short NodeIteratorImpl::isAccepted(NodeImpl *n)
{
  // if XML is implemented we have to check expandEntityRerefences in this function
  if( ( ( 1 << n->nodeType()-1) & m_whatToShow) != 0 )
    {
        if(!m_filter.isNull())
            return m_filter.acceptNode(n);
        else
	    return NodeFilter::FILTER_ACCEPT;
    }
    return NodeFilter::FILTER_SKIP;
}

// --------------------------------------------------------------


NodeFilterImpl::NodeFilterImpl()
{
    m_customNodeFilter = 0;
}

NodeFilterImpl::~NodeFilterImpl()
{
    if (m_customNodeFilter)
	m_customNodeFilter->deref();
}

short NodeFilterImpl::acceptNode(const Node &n)
{
    if (m_customNodeFilter)
	return m_customNodeFilter->acceptNode(n);
    else
	return NodeFilter::FILTER_ACCEPT;
}

void NodeFilterImpl::setCustomNodeFilter(CustomNodeFilter *custom)
{
    m_customNodeFilter = custom;
    if (m_customNodeFilter)
	m_customNodeFilter->ref();
}

CustomNodeFilter *NodeFilterImpl::customNodeFilter()
{
    return m_customNodeFilter;
}

// --------------------------------------------------------------

TreeWalkerImpl::TreeWalkerImpl()
{
    filter = 0;
    whatToShow = 0x0000FFFF;
    expandEntityReferences = true;
}

TreeWalkerImpl::TreeWalkerImpl(const TreeWalkerImpl &other) : DomShared()
{
    expandEntityReferences = other.expandEntityReferences;
    filter = other.filter;
    whatToShow = other.whatToShow;
    currentNode = other.currentNode;
    rootNode = other.rootNode;
}

TreeWalkerImpl::TreeWalkerImpl(Node n, NodeFilter *f)
{
  currentNode = n;
  rootNode = n;
  whatToShow = 0x0000FFFF;
  filter = f;
}

TreeWalkerImpl::TreeWalkerImpl(Node n, long _whatToShow, NodeFilter *f)
{
  currentNode = n;
  rootNode = n;
  whatToShow = _whatToShow;
  filter = f;
}

TreeWalkerImpl &TreeWalkerImpl::operator = (const TreeWalkerImpl &other)
{
  expandEntityReferences = other.expandEntityReferences;
  filter = other.filter;
  whatToShow = other.whatToShow;
  currentNode = other.currentNode;
  return *this;
}

TreeWalkerImpl::~TreeWalkerImpl()
{
    if(filter)
      {
        delete filter;
        filter = 0;
      }
}