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 "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
endOfFirstWordBoundaryContext(const UChar * characters,int length)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
startOfLastWordBoundaryContext(const UChar * characters,int length)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
findNextWordFromIndex(const UChar * chars,int len,int position,bool forward)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
findWordBoundary(const UChar * chars,int len,int position,int * start,int * end)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