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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2004, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
      6  *
      7  * This library is free software; you can redistribute it and/or
      8  * modify it under the terms of the GNU Library General Public
      9  * License as published by the Free Software Foundation; either
     10  * version 2 of the License, or (at your option) any later version.
     11  *
     12  * This library is distributed in the hope that it will be useful,
     13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     15  * Library General Public License for more details.
     16  *
     17  * You should have received a copy of the GNU Library General Public License
     18  * along with this library; see the file COPYING.LIB.  If not, write to
     19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     20  * Boston, MA 02110-1301, USA.
     21  */
     22 
     23 #include "config.h"
     24 #include "core/dom/LiveNodeList.h"
     25 
     26 #include "core/dom/Element.h"
     27 #include "core/html/HTMLCollection.h"
     28 
     29 namespace WebCore {
     30 
     31 Node& LiveNodeListBase::rootNode() const
     32 {
     33     if (isRootedAtDocument() && m_ownerNode->inDocument())
     34         return m_ownerNode->document();
     35     return *m_ownerNode;
     36 }
     37 
     38 ContainerNode* LiveNodeListBase::rootContainerNode() const
     39 {
     40     Node& rootNode = this->rootNode();
     41     if (!rootNode.isContainerNode())
     42         return 0;
     43     return toContainerNode(&rootNode);
     44 }
     45 
     46 void LiveNodeListBase::invalidateCache() const
     47 {
     48     m_cachedItem = 0;
     49     m_isLengthCacheValid = false;
     50     m_isItemCacheValid = false;
     51     m_isNameCacheValid = false;
     52     m_isItemRefElementsCacheValid = false;
     53     if (isNodeList(type()))
     54         return;
     55 
     56     const HTMLCollection* cacheBase = static_cast<const HTMLCollection*>(this);
     57     cacheBase->m_idCache.clear();
     58     cacheBase->m_nameCache.clear();
     59     cacheBase->m_cachedElementsArrayOffset = 0;
     60 }
     61 
     62 void LiveNodeListBase::invalidateIdNameCacheMaps() const
     63 {
     64     ASSERT(hasIdNameCache());
     65     const HTMLCollection* cacheBase = static_cast<const HTMLCollection*>(this);
     66     cacheBase->m_idCache.clear();
     67     cacheBase->m_nameCache.clear();
     68 }
     69 
     70 Node* LiveNodeList::namedItem(const AtomicString& elementId) const
     71 {
     72     Node& rootNode = this->rootNode();
     73 
     74     if (rootNode.inDocument()) {
     75         Element* element = rootNode.treeScope().getElementById(elementId);
     76         if (element && nodeMatches(element) && element->isDescendantOf(&rootNode))
     77             return element;
     78         if (!element)
     79             return 0;
     80         // In the case of multiple nodes with the same name, just fall through.
     81     }
     82 
     83     unsigned length = this->length();
     84     for (unsigned i = 0; i < length; i++) {
     85         Node* node = item(i);
     86         // FIXME: This should probably be using getIdAttribute instead of idForStyleResolution.
     87         if (node->hasID() && toElement(node)->idForStyleResolution() == elementId)
     88             return node;
     89     }
     90 
     91     return 0;
     92 }
     93 
     94 } // namespace WebCore
     95