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 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 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
33namespace WebCore {
34
35unsigned endOfFirstWordBoundaryContext(StringView text)
36{
37    unsigned length = text.length();
38    for (unsigned i = 0; i < length; ) {
39        unsigned first = i;
40        UChar32 ch;
41        U16_NEXT(text, i, length, ch);
42        if (!requiresContextForWordBoundary(ch))
43            return first;
44    }
45    return length;
46}
47
48unsigned startOfLastWordBoundaryContext(StringView text)
49{
50    unsigned length = text.length();
51    for (unsigned i = length; i > 0; ) {
52        unsigned last = i;
53        UChar32 ch;
54        U16_PREV(text, 0, i, ch);
55        if (!requiresContextForWordBoundary(ch))
56            return last;
57    }
58    return 0;
59}
60
61#if !PLATFORM(COCOA)
62
63int findNextWordFromIndex(StringView text, int position, bool forward)
64{
65    TextBreakIterator* it = wordBreakIterator(text);
66
67    if (forward) {
68        position = textBreakFollowing(it, position);
69        while (position != TextBreakDone) {
70            // We stop searching when the character preceeding the break is alphanumeric.
71            if (static_cast<unsigned>(position) < text.length() && u_isalnum(text[position - 1]))
72                return position;
73
74            position = textBreakFollowing(it, position);
75        }
76
77        return text.length();
78    } else {
79        position = textBreakPreceding(it, position);
80        while (position != TextBreakDone) {
81            // We stop searching when the character following the break is alphanumeric.
82            if (position && u_isalnum(text[position]))
83                return position;
84
85            position = textBreakPreceding(it, position);
86        }
87
88        return 0;
89    }
90}
91
92void findWordBoundary(StringView text, int position, int* start, int* end)
93{
94    TextBreakIterator* it = wordBreakIterator(text);
95    *end = textBreakFollowing(it, position);
96    if (*end < 0)
97        *end = textBreakLast(it);
98    *start = textBreakPrevious(it);
99}
100
101void findEndWordBoundary(StringView text, int position, int* end)
102{
103    TextBreakIterator* it = wordBreakIterator(text);
104    *end = textBreakFollowing(it, position);
105    if (*end < 0)
106        *end = textBreakLast(it);
107}
108
109#endif // !PLATFORM(COCOA)
110
111} // namespace WebCore
112