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 "platform/text/TextBoundaries.h"
29
30 #include "platform/text/TextBreakIterator.h"
31 #include "wtf/text/StringImpl.h"
32
33 using namespace WTF;
34 using namespace Unicode;
35
36 namespace WebCore {
37
endOfFirstWordBoundaryContext(const UChar * characters,int length)38 int endOfFirstWordBoundaryContext(const UChar* characters, int length)
39 {
40 for (int i = 0; i < length; ) {
41 int first = i;
42 UChar32 ch;
43 U16_NEXT(characters, i, length, ch);
44 if (!requiresContextForWordBoundary(ch))
45 return first;
46 }
47 return length;
48 }
49
startOfLastWordBoundaryContext(const UChar * characters,int length)50 int startOfLastWordBoundaryContext(const UChar* characters, int length)
51 {
52 for (int i = length; i > 0; ) {
53 int last = i;
54 UChar32 ch;
55 U16_PREV(characters, 0, i, ch);
56 if (!requiresContextForWordBoundary(ch))
57 return last;
58 }
59 return 0;
60 }
61
findNextWordFromIndex(const UChar * chars,int len,int position,bool forward)62 int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
63 {
64 TextBreakIterator* it = wordBreakIterator(chars, len);
65
66 if (forward) {
67 position = it->following(position);
68 while (position != TextBreakDone) {
69 // We stop searching when the character preceeding the break
70 // is alphanumeric.
71 if (position < len && isAlphanumeric(chars[position - 1]))
72 return position;
73
74 position = it->following(position);
75 }
76
77 return len;
78 } else {
79 position = it->preceding(position);
80 while (position != TextBreakDone) {
81 // We stop searching when the character following the break
82 // is alphanumeric.
83 if (position > 0 && isAlphanumeric(chars[position]))
84 return position;
85
86 position = it->preceding(position);
87 }
88
89 return 0;
90 }
91 }
92
findWordBoundary(const UChar * chars,int len,int position,int * start,int * end)93 void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
94 {
95 TextBreakIterator* it = wordBreakIterator(chars, len);
96 *end = it->following(position);
97 if (*end < 0)
98 *end = it->last();
99 *start = it->previous();
100 }
101
102
103 } // namespace WebCore
104