text: /*
   * 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
  