WebCore/NodeIterator.h

   1 /*
   2  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
   3  * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
   4  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
   5  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
   6  * Copyright (C) 2004, 2008 Apple Inc. 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
  25 #ifndef NodeIterator_h
  26 #define NodeIterator_h
  27
  28 #include "JSDOMBinding.h"
  29 #include "NodeFilter.h"
  30 #include "Traversal.h"
  31 #include <wtf/PassRefPtr.h>
  32 #include <wtf/RefCounted.h>
  33
  34 namespace WebCore {
  35
  36     typedef int ExceptionCode;
  37
  38     class NodeIterator : public RefCounted<NodeIterator>, public Traversal {
  39     public:
  40         static PassRefPtr<NodeIterator> create(PassRefPtr<Node> rootNode, unsigned whatToShow, PassRefPtr<NodeFilter> filter, bool expandEntityReferences)
  41         {
  42             return adoptRef(new NodeIterator(rootNode, whatToShow, filter, expandEntityReferences));
  43         }
  44         ~NodeIterator();
  45
  46         PassRefPtr<Node> nextNode(ScriptState*, ExceptionCode&);
  47         PassRefPtr<Node> previousNode(ScriptState*, ExceptionCode&);
  48         void detach();
  49
  50         Node* referenceNode() const { return m_referenceNode.node.get(); }
  51         bool pointerBeforeReferenceNode() const { return m_referenceNode.isPointerBeforeNode; }
  52
  53         // This function is called before any node is removed from the document tree.
  54         void nodeWillBeRemoved(Node*);
  55
  56         // For non-JS bindings. Silently ignores the JavaScript exception if any.
  57         PassRefPtr<Node> nextNode(ExceptionCode& ec) { return nextNode(scriptStateFromNode(referenceNode()), ec); }
  58         PassRefPtr<Node> previousNode(ExceptionCode& ec) { return previousNode(scriptStateFromNode(referenceNode()), ec); }
  59
  60     private:
  61         NodeIterator(PassRefPtr<Node>, unsigned whatToShow, PassRefPtr<NodeFilter>, bool expandEntityReferences);
  62
  63         struct NodePointer {
  64             RefPtr<Node> node;
  65             bool isPointerBeforeNode;
  66             NodePointer();
  67             NodePointer(PassRefPtr<Node>, bool);
  68             void clear();
  69             bool moveToNext(Node* root);
  70             bool moveToPrevious(Node* root);
  71         };
  72
  73         void updateForNodeRemoval(Node* nodeToBeRemoved, NodePointer&) const;
  74
  75         NodePointer m_referenceNode;
  76         NodePointer m_candidateNode;
  77         bool m_detached;
  78     };
  79
  80 } // namespace WebCore
  81
  82 #endif // NodeIterator_h