/*
* Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PositionIterator_h
#define PositionIterator_h
#include "core/dom/Node.h"
#include "core/dom/Position.h"
namespace WebCore {
// A Position iterator with constant-time
// increment, decrement, and several predicates on the Position it is at.
// Conversion to/from Position is O(n) in the offset.
class PositionIterator {
public:
PositionIterator()
: m_anchorNode(0)
, m_nodeAfterPositionInAnchor(0)
, m_offsetInAnchor(0)
{
}
PositionIterator(const Position& pos)
: m_anchorNode(pos.anchorNode())
, m_nodeAfterPositionInAnchor(m_anchorNode->traverseToChildAt(pos.deprecatedEditingOffset()))
, m_offsetInAnchor(m_nodeAfterPositionInAnchor ? 0 : pos.deprecatedEditingOffset())
{
}
operator Position() const;
void increment();
void decrement();
Node* node() const { return m_anchorNode; }
int offsetInLeafNode() const { return m_offsetInAnchor; }
bool atStart() const;
bool atEnd() const;
bool atStartOfNode() const;
bool atEndOfNode() const;
bool isCandidate() const;
private:
Node* m_anchorNode;
Node* m_nodeAfterPositionInAnchor; // If this is non-null, m_nodeAfterPositionInAnchor->parentNode() == m_anchorNode;
int m_offsetInAnchor;
};
} // namespace WebCore
#endif // PositionIterator_h