text: /*
   * Copyright (C) 2006, 2007 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. 
   */
  
  #include "config.h"
  #include "TextBoundaries.h"
  
  #include <unicode/ubrk.h>
  
  #include "StringImpl.h"
  #include "TextBreakIterator.h"
  
  namespace WebCore {
  
  int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
  {
      UBreakIterator* it = wordBreakIterator(chars, len);
  
      if (forward) {
          position = ubrk_following(it, position);
          while (position != UBRK_DONE) {
              // We stop searching when the character preceeding the break
              // is alphanumeric.
              if (position < len && u_isalnum(chars[position - 1]))
                  return position;
  
              position = ubrk_following(it, position);
          }
  
          return len;
      } else {
          position = ubrk_preceding(it, position);
          while (position != UBRK_DONE) {
              // We stop searching when the character following the break
              // is alphanumeric.
              if (position > 0 && u_isalnum(chars[position]))
                  return position;
  
              position = ubrk_preceding(it, position);
          }
  
          return 0;
      }
  }
  
  void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
  {
      UBreakIterator* it = wordBreakIterator(chars, len);
      *end = ubrk_following(it, position);
      if (*end < 0)
          *end = ubrk_last(it);
      *start = ubrk_previous(it);
  }
  
  } // namespace WebCore
  