1/*
2 * Copyright (C) 2012 Apple Inc. All rights reserved.
3 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef Latin1TextIterator_h
23#define Latin1TextIterator_h
24
25#include "wtf/text/WTFString.h"
26
27namespace blink {
28
29class Latin1TextIterator {
30public:
31    // The passed in LChar pointer starts at 'currentCharacter'. The iterator operates on the range [currentCharacter, lastCharacter].
32    // 'endCharacter' denotes the maximum length of the UChar array, which might exceed 'lastCharacter'.
33    Latin1TextIterator(const LChar* characters, int currentCharacter, int lastCharacter, int /*endCharacter*/)
34        : m_characters(characters)
35        , m_currentCharacter(currentCharacter)
36        , m_lastCharacter(lastCharacter)
37    {
38    }
39
40    bool consume(UChar32& character, unsigned& clusterLength)
41    {
42        if (m_currentCharacter >= m_lastCharacter)
43            return false;
44
45        character = *m_characters;
46        clusterLength = 1;
47        return true;
48    }
49
50    void advance(unsigned advanceLength)
51    {
52        m_characters += advanceLength;
53        m_currentCharacter += advanceLength;
54    }
55
56    int currentCharacter() const { return m_currentCharacter; }
57    const LChar* characters() const { return m_characters; }
58
59private:
60    const LChar* m_characters;
61    int m_currentCharacter;
62    int m_lastCharacter;
63};
64
65} // namespace blink
66
67#endif
68