117 lines
3.4 KiB
C++
117 lines
3.4 KiB
C++
/*
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* Copyright (C) 2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <unicode/utypes.h>
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#include <wtf/Assertions.h>
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#include <wtf/text/LChar.h>
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namespace WTF {
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template<typename CharacterType>
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class CodePointIterator {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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ALWAYS_INLINE CodePointIterator() { }
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ALWAYS_INLINE CodePointIterator(const CharacterType* begin, const CharacterType* end)
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: m_begin(begin)
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, m_end(end)
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{
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}
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ALWAYS_INLINE CodePointIterator(const CodePointIterator& begin, const CodePointIterator& end)
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: CodePointIterator(begin.m_begin, end.m_begin)
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{
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ASSERT(end.m_begin >= begin.m_begin);
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}
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ALWAYS_INLINE UChar32 operator*() const;
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ALWAYS_INLINE CodePointIterator& operator++();
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ALWAYS_INLINE bool operator==(const CodePointIterator& other) const
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{
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return m_begin == other.m_begin
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&& m_end == other.m_end;
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}
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ALWAYS_INLINE bool operator!=(const CodePointIterator& other) const { return !(*this == other); }
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ALWAYS_INLINE bool atEnd() const
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{
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ASSERT(m_begin <= m_end);
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return m_begin >= m_end;
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}
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ALWAYS_INLINE size_t codeUnitsSince(const CharacterType* reference) const
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{
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ASSERT(m_begin >= reference);
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return m_begin - reference;
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}
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ALWAYS_INLINE size_t codeUnitsSince(const CodePointIterator& other) const
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{
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return codeUnitsSince(other.m_begin);
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}
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private:
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const CharacterType* m_begin { nullptr };
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const CharacterType* m_end { nullptr };
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};
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template<>
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ALWAYS_INLINE UChar32 CodePointIterator<LChar>::operator*() const
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{
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ASSERT(!atEnd());
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return *m_begin;
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}
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template<>
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ALWAYS_INLINE auto CodePointIterator<LChar>::operator++() -> CodePointIterator&
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{
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m_begin++;
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return *this;
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}
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template<>
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ALWAYS_INLINE UChar32 CodePointIterator<UChar>::operator*() const
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{
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ASSERT(!atEnd());
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UChar32 c;
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U16_GET(m_begin, 0, 0, m_end - m_begin, c);
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return c;
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}
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template<>
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ALWAYS_INLINE auto CodePointIterator<UChar>::operator++() -> CodePointIterator&
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{
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unsigned i = 0;
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size_t length = m_end - m_begin;
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U16_FWD_1(m_begin, i, length);
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m_begin += i;
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return *this;
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}
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} // namespace WTF
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