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      1 /*
      2  * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
      3  * Copyright (C) 2009 Dominik Rttsches <dominik.roettsches (at) access-company.com>
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include "config.h"
     28 #include "TextBoundaries.h"
     29 
     30 #include "TextBreakIterator.h"
     31 #include <wtf/text/StringImpl.h>
     32 #include <wtf/unicode/Unicode.h>
     33 
     34 using namespace WTF;
     35 using namespace Unicode;
     36 
     37 namespace WebCore {
     38 
     39 int endOfFirstWordBoundaryContext(const UChar* characters, int length)
     40 {
     41     for (int i = 0; i < length; ) {
     42         int first = i;
     43         UChar32 ch;
     44         U16_NEXT(characters, i, length, ch);
     45         if (!requiresContextForWordBoundary(ch))
     46             return first;
     47     }
     48     return length;
     49 }
     50 
     51 int startOfLastWordBoundaryContext(const UChar* characters, int length)
     52 {
     53     for (int i = length; i > 0; ) {
     54         int last = i;
     55         UChar32 ch;
     56         U16_PREV(characters, 0, i, ch);
     57         if (!requiresContextForWordBoundary(ch))
     58             return last;
     59     }
     60     return 0;
     61 }
     62 
     63 #if !PLATFORM(BREWMP) && !PLATFORM(MAC) && !PLATFORM(QT)
     64 
     65 int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
     66 {
     67     TextBreakIterator* it = wordBreakIterator(chars, len);
     68 
     69     if (forward) {
     70         position = textBreakFollowing(it, position);
     71         while (position != TextBreakDone) {
     72             // We stop searching when the character preceeding the break
     73             // is alphanumeric.
     74             if (position < len && isAlphanumeric(chars[position - 1]))
     75                 return position;
     76 
     77             position = textBreakFollowing(it, position);
     78         }
     79 
     80         return len;
     81     } else {
     82         position = textBreakPreceding(it, position);
     83         while (position != TextBreakDone) {
     84             // We stop searching when the character following the break
     85             // is alphanumeric.
     86             if (position > 0 && isAlphanumeric(chars[position]))
     87                 return position;
     88 
     89             position = textBreakPreceding(it, position);
     90         }
     91 
     92         return 0;
     93     }
     94 }
     95 
     96 void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
     97 {
     98     TextBreakIterator* it = wordBreakIterator(chars, len);
     99     *end = textBreakFollowing(it, position);
    100     if (*end < 0)
    101         *end = textBreakLast(it);
    102     *start = textBreakPrevious(it);
    103 }
    104 
    105 #endif // !PLATFORM(BREWMP) && !PLATFORM(MAC) && !PLATFORM(QT)
    106 
    107 } // namespace WebCore
    108