1// Copyright (C) 2013 Google Inc. All rights reserved.
2//
3// Redistribution and use in source and binary forms, with or without
4// modification, are permitted provided that the following conditions are
5// met:
6//
7//    * Redistributions of source code must retain the above copyright
8// notice, this list of conditions and the following disclaimer.
9//    * Redistributions in binary form must reproduce the above
10// copyright notice, this list of conditions and the following disclaimer
11// in the documentation and/or other materials provided with the
12// distribution.
13//    * Neither the name of Google Inc. nor the names of its
14// contributors may be used to endorse or promote products derived from
15// this software without specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29#ifndef TextRunIterator_h
30#define TextRunIterator_h
31
32#include "platform/text/TextRun.h"
33
34namespace blink {
35
36class TextRunIterator {
37public:
38    TextRunIterator()
39        : m_textRun(0)
40        , m_offset(0)
41    {
42    }
43
44    TextRunIterator(const TextRun* textRun, unsigned offset)
45        : m_textRun(textRun)
46        , m_offset(offset)
47    {
48    }
49
50    TextRunIterator(const TextRunIterator& other)
51        : m_textRun(other.m_textRun)
52        , m_offset(other.m_offset)
53    {
54    }
55
56    unsigned offset() const { return m_offset; }
57    void increment() { m_offset++; }
58    bool atEnd() const { return !m_textRun || m_offset >= m_textRun->length(); }
59    UChar current() const { return (*m_textRun)[m_offset]; }
60    WTF::Unicode::Direction direction() const { return atEnd() ? WTF::Unicode::OtherNeutral : WTF::Unicode::direction(current()); }
61    bool atParagraphSeparator() const { return current() == '\n'; }
62
63    bool operator==(const TextRunIterator& other)
64    {
65        return m_offset == other.m_offset && m_textRun == other.m_textRun;
66    }
67
68    bool operator!=(const TextRunIterator& other) { return !operator==(other); }
69
70private:
71    const TextRun* m_textRun;
72    int m_offset;
73};
74
75
76} // namespace blink
77
78#endif // TextRunIterator_h
79