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/*
* 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) 2004-2019 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.
*
*/
#pragma once
#include "ExceptionOr.h"
#include "NodeFilter.h"
#include "ScriptWrappable.h"
#include "Traversal.h"
#include <wtf/RefCountedAndCanMakeWeakPtr.h>
#include <wtf/TZoneMalloc.h>
namespace WebCore {
class NodeIterator final : public ScriptWrappable, public RefCountedAndCanMakeWeakPtr<NodeIterator>, public NodeIteratorBase {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED_EXPORT(NodeIterator, WEBCORE_EXPORT);
public:
static Ref<NodeIterator> create(Node&, unsigned whatToShow, RefPtr<NodeFilter>&&);
WEBCORE_EXPORT ~NodeIterator();
WEBCORE_EXPORT ExceptionOr<RefPtr<Node>> nextNode();
WEBCORE_EXPORT ExceptionOr<RefPtr<Node>> previousNode();
void detach() { } // This is now a no-op as per the DOM specification.
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 whatToShow, RefPtr<NodeFilter>&&);
struct NodePointer {
RefPtr<Node> node;
bool isPointerBeforeNode { true };
NodePointer() = default;
NodePointer(Node&, bool);
RefPtr<Node> protectedNode() const { return node; }
void clear();
bool moveToNext(Node& root);
bool moveToPrevious(Node& root);
};
void updateForNodeRemoval(Node& nodeToBeRemoved, NodePointer&) const;
NodePointer m_referenceNode;
NodePointer m_candidateNode;
};
} // namespace WebCore
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