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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, 2007, 2008 Apple Inc. All rights reserved.
      6  * Copyright (C) 2014 Samsung Electronics. All rights reserved.
      7  *
      8  * This library is free software; you can redistribute it and/or
      9  * modify it under the terms of the GNU Library General Public
     10  * License as published by the Free Software Foundation; either
     11  * version 2 of the License, or (at your option) any later version.
     12  *
     13  * This library is distributed in the hope that it will be useful,
     14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     16  * Library General Public License for more details.
     17  *
     18  * You should have received a copy of the GNU Library General Public License
     19  * along with this library; see the file COPYING.LIB.  If not, write to
     20  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     21  * Boston, MA 02110-1301, USA.
     22  */
     23 
     24 #include "config.h"
     25 #include "core/dom/ChildNodeList.h"
     26 
     27 #include "core/dom/Element.h"
     28 #include "core/dom/NodeRareData.h"
     29 
     30 namespace blink {
     31 
     32 ChildNodeList::ChildNodeList(ContainerNode& parent)
     33     : m_parent(parent)
     34 {
     35 }
     36 
     37 Node* ChildNodeList::virtualOwnerNode() const
     38 {
     39     return &ownerNode();
     40 }
     41 
     42 ChildNodeList::~ChildNodeList()
     43 {
     44 #if !ENABLE(OILPAN)
     45     m_parent->nodeLists()->removeChildNodeList(this);
     46 #endif
     47 }
     48 
     49 Node* ChildNodeList::traverseForwardToOffset(unsigned offset, Node& currentNode, unsigned& currentOffset) const
     50 {
     51     ASSERT(currentOffset < offset);
     52     for (Node* next = currentNode.nextSibling(); next; next = next->nextSibling()) {
     53         if (++currentOffset == offset)
     54             return next;
     55     }
     56     return 0;
     57 }
     58 
     59 Node* ChildNodeList::traverseBackwardToOffset(unsigned offset, Node& currentNode, unsigned& currentOffset) const
     60 {
     61     ASSERT(currentOffset > offset);
     62     for (Node* previous = currentNode.previousSibling(); previous; previous = previous->previousSibling()) {
     63         if (--currentOffset == offset)
     64             return previous;
     65     }
     66     return 0;
     67 }
     68 
     69 void ChildNodeList::trace(Visitor* visitor)
     70 {
     71     visitor->trace(m_parent);
     72     visitor->trace(m_collectionIndexCache);
     73     NodeList::trace(visitor);
     74 }
     75 
     76 } // namespace blink
     77