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 "PlatformString.h"
24
25 #include "SharedBuffer.h"
26 #include "TextBreakIterator.h"
27 #include <wtf/unicode/UTF8.h>
28 #include <wtf/unicode/Unicode.h>
29
30 using namespace WTF;
31 using namespace WTF::Unicode;
32
33 namespace WebCore {
34
utf8Buffer(const String & string)35 PassRefPtr<SharedBuffer> utf8Buffer(const String& string)
36 {
37 // Allocate a buffer big enough to hold all the characters.
38 const int length = string.length();
39 Vector<char> buffer(length * 3);
40
41 // Convert to runs of 8-bit characters.
42 char* p = buffer.data();
43 const UChar* d = string.characters();
44 ConversionResult result = convertUTF16ToUTF8(&d, d + length, &p, p + buffer.size(), true);
45 if (result != conversionOK)
46 return 0;
47
48 buffer.shrink(p - buffer.data());
49 return SharedBuffer::adoptVector(buffer);
50 }
51
numGraphemeClusters(const String & s)52 unsigned numGraphemeClusters(const String& s)
53 {
54 TextBreakIterator* it = characterBreakIterator(s.characters(), s.length());
55 if (!it)
56 return s.length();
57
58 unsigned num = 0;
59 while (textBreakNext(it) != TextBreakDone)
60 ++num;
61 return num;
62 }
63
numCharactersInGraphemeClusters(const String & s,unsigned numGraphemeClusters)64 unsigned numCharactersInGraphemeClusters(const String& s, unsigned numGraphemeClusters)
65 {
66 TextBreakIterator* it = characterBreakIterator(s.characters(), s.length());
67 if (!it)
68 return min(s.length(), numGraphemeClusters);
69
70 for (unsigned i = 0; i < numGraphemeClusters; ++i) {
71 if (textBreakNext(it) == TextBreakDone)
72 return s.length();
73 }
74 return textBreakCurrent(it);
75 }
76
77 } // namespace WebCore
78