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/*
* Copyright (C) 2020 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 <unicode/utypes.h>
#include <wtf/Assertions.h>
#include <wtf/text/LChar.h>
#include <wtf/text/ParsingUtilities.h>
namespace WTF {
template<typename CharacterType>
class CodePointIterator {
WTF_MAKE_FAST_ALLOCATED;
public:
ALWAYS_INLINE CodePointIterator() = default;
ALWAYS_INLINE CodePointIterator(std::span<const CharacterType> data)
: m_data(data)
{
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
ALWAYS_INLINE CodePointIterator(const CodePointIterator& begin, const CodePointIterator& end)
: CodePointIterator({ begin.m_data.data(), end.m_data.data() })
{
ASSERT(end.m_data.data() >= begin.m_data.data());
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
ALWAYS_INLINE char32_t operator*() const;
ALWAYS_INLINE CodePointIterator& operator++();
ALWAYS_INLINE friend bool operator==(const CodePointIterator& a, const CodePointIterator& b)
{
return a.m_data.data() == b.m_data.data() && a.m_data.size() == b.m_data.size();
}
ALWAYS_INLINE bool atEnd() const
{
return m_data.empty();
}
ALWAYS_INLINE size_t codeUnitsSince(const CharacterType* reference) const
{
ASSERT(m_data.data() >= reference);
return m_data.data() - reference;
}
ALWAYS_INLINE size_t codeUnitsSince(const CodePointIterator& other) const
{
return codeUnitsSince(other.m_data.data());
}
private:
std::span<const CharacterType> m_data;
};
template<>
ALWAYS_INLINE char32_t CodePointIterator<LChar>::operator*() const
{
ASSERT(!atEnd());
return m_data.front();
}
template<>
ALWAYS_INLINE auto CodePointIterator<LChar>::operator++() -> CodePointIterator&
{
skip(m_data, 1);
return *this;
}
template<>
ALWAYS_INLINE char32_t CodePointIterator<UChar>::operator*() const
{
ASSERT(!atEnd());
char32_t c;
U16_GET(m_data, 0, 0, m_data.size(), c);
return c;
}
template<>
ALWAYS_INLINE auto CodePointIterator<UChar>::operator++() -> CodePointIterator&
{
unsigned i = 0;
size_t length = m_data.size();
U16_FWD_1(m_data, i, length);
skip(m_data, i);
return *this;
}
template<typename CharacterType> CodePointIterator(std::span<const CharacterType>) -> CodePointIterator<CharacterType>;
} // namespace WTF
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