/*
 * 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<EditingInFlatTreeStrategy>;

using BackwardsCharacterIterator =
    BackwardsCharacterIteratorAlgorithm<EditingStrategy>;

}  // namespace blink

#endif  // BackwardsCharacterIterator_h
