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
33using namespace WTF;
34using namespace Unicode;
35
36namespace WebCore {
37
38int 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
50int 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
62int 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
93void 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