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
34using namespace WTF;
35using namespace Unicode;
36
37namespace WebCore {
38
39int 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
51int 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(MAC) && !PLATFORM(QT)
64
65int 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
96void 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(MAC) && !PLATFORM(QT)
106
107} // namespace WebCore
108