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/*
* Copyright (C) 2022 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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.
*/
#pragma once
#include "TextRun.h"
namespace WebCore {
class TextBoxIterator {
public:
TextBoxIterator() = default;
TextBoxIterator(const TextRun* textRun, unsigned offset)
: m_textRun(textRun)
, m_offset(offset)
{
}
unsigned offset() const { return m_offset; }
void increment() { m_offset++; }
bool atEnd() const { return !m_textRun || m_offset >= m_textRun->length(); }
UChar current() const { return (*m_textRun)[m_offset]; }
UCharDirection direction() const { return atEnd() ? U_OTHER_NEUTRAL : u_charDirection(current()); }
bool operator==(const TextBoxIterator& other) const
{
return m_offset == other.m_offset && m_textRun == other.m_textRun;
}
bool operator!=(const TextBoxIterator& other) const { return !operator==(other); }
private:
const TextRun* m_textRun { nullptr };
unsigned m_offset { 0 };
};
} // namespace WebCore