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// Copyright (C) 2013 Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef TextRunIterator_h
#define TextRunIterator_h
#include "platform/text/TextRun.h"
namespace blink {
class TextRunIterator {
public:
TextRunIterator()
: m_textRun(0)
, m_offset(0)
, m_length(0)
{
}
TextRunIterator(const TextRun* textRun, unsigned offset)
: m_textRun(textRun)
, m_offset(offset)
, m_length(m_textRun->length())
{
}
TextRunIterator(const TextRunIterator& other)
: m_textRun(other.m_textRun)
, m_offset(other.m_offset)
, m_length(m_textRun->length())
{
}
unsigned offset() const { return m_offset; }
void increment() { m_offset++; }
bool atEnd() const { return m_offset >= m_length; }
UChar current() const { return (*m_textRun)[m_offset]; }
WTF::Unicode::Direction direction() const { return atEnd() ? WTF::Unicode::OtherNeutral : WTF::Unicode::direction(current()); }
bool atParagraphSeparator() const { return current() == '\n'; }
bool operator==(const TextRunIterator& other)
{
return m_offset == other.m_offset && m_textRun == other.m_textRun;
}
bool operator!=(const TextRunIterator& other) { return !operator==(other); }
private:
const TextRun* m_textRun;
unsigned m_offset;
unsigned m_length;
};
} // namespace blink
#endif // TextRunIterator_h
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