1 /*
2 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "TextBoundaries.h"
28
29 #include <unicode/ubrk.h>
30 #include <unicode/uchar.h>
31
32 #include "StringImpl.h"
33 #include "TextBreakIterator.h"
34
35 namespace WebCore {
36
findNextWordFromIndex(const UChar * chars,int len,int position,bool forward)37 int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
38 {
39 UBreakIterator* it = wordBreakIterator(chars, len);
40
41 if (forward) {
42 position = ubrk_following(it, position);
43 while (position != UBRK_DONE) {
44 // We stop searching when the character preceeding the break
45 // is alphanumeric.
46 if (position < len && u_isalnum(chars[position - 1]))
47 return position;
48
49 position = ubrk_following(it, position);
50 }
51
52 return len;
53 } else {
54 position = ubrk_preceding(it, position);
55 while (position != UBRK_DONE) {
56 // We stop searching when the character following the break
57 // is alphanumeric.
58 if (position > 0 && u_isalnum(chars[position]))
59 return position;
60
61 position = ubrk_preceding(it, position);
62 }
63
64 return 0;
65 }
66 }
67
findWordBoundary(const UChar * chars,int len,int position,int * start,int * end)68 void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
69 {
70 UBreakIterator* it = wordBreakIterator(chars, len);
71 *end = ubrk_following(it, position);
72 if (*end < 0)
73 *end = ubrk_last(it);
74 *start = ubrk_previous(it);
75 }
76
77 } // namespace WebCore
78