1/*
2 * (C) 1999 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
4 * Copyright (C) 2007-2009 Torch Mobile, Inc.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB.  If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22#include "config.h"
23#include "platform/text/TextBreakIterator.h"
24
25namespace blink {
26
27unsigned numGraphemeClusters(const String& string)
28{
29    unsigned stringLength = string.length();
30
31    if (!stringLength)
32        return 0;
33
34    // The only Latin-1 Extended Grapheme Cluster is CR LF
35    if (string.is8Bit() && !string.contains('\r'))
36        return stringLength;
37
38    NonSharedCharacterBreakIterator it(string);
39    if (!it)
40        return stringLength;
41
42    unsigned num = 0;
43    while (it.next() != TextBreakDone)
44        ++num;
45    return num;
46}
47
48unsigned numCharactersInGraphemeClusters(const String& string, unsigned numGraphemeClusters)
49{
50    unsigned stringLength = string.length();
51
52    if (!stringLength)
53        return 0;
54
55    // The only Latin-1 Extended Grapheme Cluster is CR LF
56    if (string.is8Bit() && !string.contains('\r'))
57        return std::min(stringLength, numGraphemeClusters);
58
59    NonSharedCharacterBreakIterator it(string);
60    if (!it)
61        return std::min(stringLength, numGraphemeClusters);
62
63    for (unsigned i = 0; i < numGraphemeClusters; ++i) {
64        if (it.next() == TextBreakDone)
65            return stringLength;
66    }
67    return it.current();
68}
69
70} // namespace blink
71