text: /*
   * Copyright (C) 2004, 2006 Apple Computer, 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_BOUNDARIES_H_
  #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_TEXT_TEXT_BOUNDARIES_H_
  
  #include <utility>
  
  #include "third_party/blink/renderer/platform/platform_export.h"
  #include "third_party/blink/renderer/platform/wtf/text/unicode.h"
  
  namespace blink {
  
  inline bool RequiresContextForWordBoundary(UChar32 ch) {
    return WTF::Unicode::HasLineBreakingPropertyComplexContext(ch);
  }
  
  PLATFORM_EXPORT int EndOfFirstWordBoundaryContext(const UChar* characters,
                                                    int length);
  PLATFORM_EXPORT int StartOfLastWordBoundaryContext(const UChar* characters,
                                                     int length);
  
  // |UChar*| should be a string in logical order instead of visual order, since
  // |FindWordBoundary()| uses ICU, which works on logical order strings
  PLATFORM_EXPORT std::pair<int, int> FindWordBackward(const UChar*,
                                                       int len,
                                                       int position);
  PLATFORM_EXPORT std::pair<int, int> FindWordForward(const UChar*,
                                                      int len,
                                                      int position);
  PLATFORM_EXPORT int FindWordStartBoundary(const UChar*, int len, int position);
  PLATFORM_EXPORT int FindWordEndBoundary(const UChar*, int len, int position);
  PLATFORM_EXPORT int FindNextWordBackward(const UChar*, int len, int position);
  PLATFORM_EXPORT int FindNextWordForward(const UChar*, int len, int position);
  
  }  // namespace blink
  
  #endif
  