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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
*
* 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., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "DynamicNodeList.h"
#include "Document.h"
#include "Element.h"
namespace WebCore {
DynamicNodeList::DynamicNodeList(PassRefPtr<Node> rootNode)
: m_rootNode(rootNode)
, m_caches(Caches::create())
, m_ownsCaches(true)
{
m_rootNode->registerDynamicNodeList(this);
}
DynamicNodeList::DynamicNodeList(PassRefPtr<Node> rootNode, DynamicNodeList::Caches* caches)
: m_rootNode(rootNode)
, m_caches(caches)
, m_ownsCaches(false)
{
m_rootNode->registerDynamicNodeList(this);
}
DynamicNodeList::~DynamicNodeList()
{
m_rootNode->unregisterDynamicNodeList(this);
}
unsigned DynamicNodeList::length() const
{
if (m_caches->isLengthCacheValid)
return m_caches->cachedLength;
unsigned length = 0;
for (Node* n = m_rootNode->firstChild(); n; n = n->traverseNextNode(m_rootNode.get()))
length += n->isElementNode() && nodeMatches(static_cast<Element*>(n));
m_caches->cachedLength = length;
m_caches->isLengthCacheValid = true;
return length;
}
Node* DynamicNodeList::itemForwardsFromCurrent(Node* start, unsigned offset, int remainingOffset) const
{
ASSERT(remainingOffset >= 0);
for (Node* n = start; n; n = n->traverseNextNode(m_rootNode.get())) {
if (n->isElementNode() && nodeMatches(static_cast<Element*>(n))) {
if (!remainingOffset) {
m_caches->lastItem = n;
m_caches->lastItemOffset = offset;
m_caches->isItemCacheValid = true;
return n;
}
--remainingOffset;
}
}
return 0; // no matching node in this subtree
}
Node* DynamicNodeList::itemBackwardsFromCurrent(Node* start, unsigned offset, int remainingOffset) const
{
ASSERT(remainingOffset < 0);
for (Node* n = start; n; n = n->traversePreviousNode(m_rootNode.get())) {
if (n->isElementNode() && nodeMatches(static_cast<Element*>(n))) {
if (!remainingOffset) {
m_caches->lastItem = n;
m_caches->lastItemOffset = offset;
m_caches->isItemCacheValid = true;
return n;
}
++remainingOffset;
}
}
return 0; // no matching node in this subtree
}
Node* DynamicNodeList::item(unsigned offset) const
{
int remainingOffset = offset;
Node* start = m_rootNode->firstChild();
if (m_caches->isItemCacheValid) {
if (offset == m_caches->lastItemOffset)
return m_caches->lastItem;
else if (offset > m_caches->lastItemOffset || m_caches->lastItemOffset - offset < offset) {
start = m_caches->lastItem;
remainingOffset -= m_caches->lastItemOffset;
}
}
if (remainingOffset < 0)
return itemBackwardsFromCurrent(start, offset, remainingOffset);
return itemForwardsFromCurrent(start, offset, remainingOffset);
}
Node* DynamicNodeList::itemWithName(const AtomicString& elementId) const
{
if (m_rootNode->isDocumentNode() || m_rootNode->inDocument()) {
Element* node = m_rootNode->document()->getElementById(elementId);
if (node && nodeMatches(node)) {
for (Node* p = node->parentNode(); p; p = p->parentNode()) {
if (p == m_rootNode)
return node;
}
}
if (!node)
return 0;
// In the case of multiple nodes with the same name, just fall through.
}
unsigned length = this->length();
for (unsigned i = 0; i < length; i++) {
Node* node = item(i);
// FIXME: This should probably be using getIdAttribute instead of idForStyleResolution.
if (node->hasID() && static_cast<Element*>(node)->idForStyleResolution() == elementId)
return node;
}
return 0;
}
void DynamicNodeList::invalidateCache()
{
// This should only be called for node lists that own their own caches.
ASSERT(m_ownsCaches);
m_caches->reset();
}
DynamicNodeList::Caches::Caches()
: lastItem(0)
, isLengthCacheValid(false)
, isItemCacheValid(false)
{
}
PassRefPtr<DynamicNodeList::Caches> DynamicNodeList::Caches::create()
{
return adoptRef(new Caches());
}
void DynamicNodeList::Caches::reset()
{
lastItem = 0;
isLengthCacheValid = false;
isItemCacheValid = false;
}
} // namespace WebCore
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