1 /*
2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2009 Dominik Röttsches <dominik.roettsches@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 "StringImpl.h"
31 #include "TextBreakIterator.h"
32 #include <wtf/unicode/Unicode.h>
33
34 using namespace WTF;
35 using namespace Unicode;
36
37 namespace WebCore {
38
findNextWordFromIndex(const UChar * chars,int len,int position,bool forward)39 int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
40 {
41 TextBreakIterator* it = wordBreakIterator(chars, len);
42
43 if (forward) {
44 position = textBreakFollowing(it, position);
45 while (position != TextBreakDone) {
46 // We stop searching when the character preceeding the break
47 // is alphanumeric.
48 if (position < len && isAlphanumeric(chars[position - 1]))
49 return position;
50
51 position = textBreakFollowing(it, position);
52 }
53
54 return len;
55 } else {
56 position = textBreakPreceding(it, position);
57 while (position != TextBreakDone) {
58 // We stop searching when the character following the break
59 // is alphanumeric.
60 if (position > 0 && isAlphanumeric(chars[position]))
61 return position;
62
63 position = textBreakPreceding(it, position);
64 }
65
66 return 0;
67 }
68 }
69
findWordBoundary(const UChar * chars,int len,int position,int * start,int * end)70 void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
71 {
72 TextBreakIterator* it = wordBreakIterator(chars, len);
73 *end = textBreakFollowing(it, position);
74 if (*end < 0)
75 *end = textBreakLast(it);
76 *start = textBreakPrevious(it);
77 }
78
79 } // namespace WebCore
80