NodeIterator.h   [plain text]

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
 * Copyright (C) 2001 Peter Kelly (pmk@post.com)
 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
 * Copyright (C) 2004, 2008 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.
 *
 */

#ifndef NodeIterator_h
#define NodeIterator_h

#include "NodeFilter.h"
#include "ScriptWrappable.h"
#include "Traversal.h"
#include <wtf/RefCounted.h>

namespace WebCore {

    typedef int ExceptionCode;

    class NodeIterator : public ScriptWrappable, public RefCounted<NodeIterator>, public NodeIteratorBase {
    public:
        static Ref<NodeIterator> create(Node& rootNode, unsigned long whatToShow, RefPtr<NodeFilter>&& filter)
        {
            return adoptRef(*new NodeIterator(rootNode, whatToShow, WTFMove(filter)));
        }
        ~NodeIterator();

        RefPtr<Node> nextNode();
        RefPtr<Node> previousNode();
        void detach();

        Node* referenceNode() const { return m_referenceNode.node.get(); }
        bool pointerBeforeReferenceNode() const { return m_referenceNode.isPointerBeforeNode; }

        // This function is called before any node is removed from the document tree.
        void nodeWillBeRemoved(Node&);

    private:
        NodeIterator(Node&, unsigned long whatToShow, RefPtr<NodeFilter>&&);

        struct NodePointer {
            RefPtr<Node> node;
            bool isPointerBeforeNode { true };

            NodePointer() = default;
            NodePointer(Node&, bool);

            void clear();
            bool moveToNext(Node& root);
            bool moveToPrevious(Node& root);
        };

        void updateForNodeRemoval(Node& nodeToBeRemoved, NodePointer&) const;

        NodePointer m_referenceNode;
        NodePointer m_candidateNode;
    };

} // namespace WebCore

#endif // NodeIterator_h