/*
 * Copyright (C) 2004, 2006, 2009 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 COMPUTER, 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 COMPUTER, 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 BackwardsCharacterIterator_h
#define BackwardsCharacterIterator_h

#include "core/editing/iterators/SimplifiedBackwardsTextIterator.h"
#include "platform/heap/Heap.h"

namespace blink {

template <typename Strategy>
class BackwardsCharacterIteratorAlgorithm {
    STACK_ALLOCATED();
public:
    BackwardsCharacterIteratorAlgorithm(const PositionTemplate<Strategy>&, const PositionTemplate<Strategy>&, TextIteratorBehaviorFlags = TextIteratorDefaultBehavior);

    void advance(int);

    bool atEnd() const { return m_textIterator.atEnd(); }

    PositionTemplate<Strategy> endPosition() const;

    bool isInTextSecurityMode() const { return m_textIterator.isInTextSecurityMode(); }

private:
    int m_offset;
    int m_runOffset;
    bool m_atBreak;

    SimplifiedBackwardsTextIteratorAlgorithm<Strategy> m_textIterator;
};

extern template class CORE_EXTERN_TEMPLATE_EXPORT BackwardsCharacterIteratorAlgorithm<EditingStrategy>;
extern template class CORE_EXTERN_TEMPLATE_EXPORT BackwardsCharacterIteratorAlgorithm<EditingInComposedTreeStrategy>;

using BackwardsCharacterIterator = BackwardsCharacterIteratorAlgorithm<EditingStrategy>;

} // namespace blink

#endif // BackwardsCharacterIterator_h
