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/*
* Copyright (C) 2012-2023 Apple Inc. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#include <wtf/text/WTFString.h>
namespace WebCore {
class Latin1TextIterator {
public:
// The passed in LChar pointer starts at 'currentIndex'. The iterator operates on the range [currentIndex, lastIndex].
// 'endCharacter' denotes the maximum length of the UChar array, which might exceed 'lastIndex'.
Latin1TextIterator(std::span<const LChar> characters, unsigned currentIndex, unsigned lastIndex)
: m_characters(characters)
, m_currentIndex(currentIndex)
, m_originalIndex(currentIndex)
, m_lastIndex(lastIndex)
{
}
bool consume(char32_t& character, unsigned& clusterLength)
{
if (m_currentIndex >= m_lastIndex)
return false;
auto relativeIndex = m_currentIndex - m_originalIndex;
character = m_characters[relativeIndex];
clusterLength = 1;
return true;
}
void advance(unsigned advanceLength)
{
m_currentIndex += advanceLength;
}
void reset(unsigned index)
{
if (index >= m_lastIndex)
return;
m_currentIndex = index;
}
std::span<const LChar> remainingCharacters() const
{
auto relativeIndex = m_currentIndex - m_originalIndex;
return m_characters.subspan(relativeIndex);
}
unsigned currentIndex() const { return m_currentIndex; }
std::span<const LChar> characters() const { return m_characters; }
private:
std::span<const LChar> m_characters;
unsigned m_currentIndex;
const unsigned m_originalIndex;
const unsigned m_lastIndex;
};
} // namespace WebCore
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