1/*
2 * Copyright (C) 2013 Igalia S.L.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
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 IGALIA AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef UTF16UChar32Iterator_h
27#define UTF16UChar32Iterator_h
28
29namespace WebCore {
30
31class UTF16UChar32Iterator {
32    WTF_MAKE_NONCOPYABLE(UTF16UChar32Iterator);
33public:
34    UTF16UChar32Iterator(const UChar* buffer, unsigned bufferLength)
35        : m_buffer(buffer)
36        , m_bufferLength(bufferLength)
37        , m_currentOffset(0)
38    {
39    }
40
41    static UChar32 end()
42    {
43        return static_cast<UChar32>(-1);
44    }
45
46    UChar32 next()
47    {
48        if (m_currentOffset >= m_bufferLength)
49            return end();
50
51        const UChar32 character = m_buffer[m_currentOffset++];
52        if (U16_IS_SURROGATE_LEAD(character)
53            && m_currentOffset != m_bufferLength
54            && U16_IS_TRAIL(m_buffer[m_currentOffset])) {
55            return U16_GET_SUPPLEMENTARY(character, m_buffer[m_currentOffset++]);
56        }
57
58        return character;
59    }
60
61private:
62    const UChar* m_buffer;
63    unsigned m_bufferLength;
64    unsigned m_currentOffset;
65};
66
67} // namespace WebCore
68
69
70#endif // UTF16UChar32Iterator_h
71