mirror of
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141 lines
3.2 KiB
C++
141 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/Checked.h>
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#include <AK/Format.h>
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#include <AK/Types.h>
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namespace AK {
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class Utf32View;
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class Utf32CodePointIterator {
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friend class Utf32View;
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public:
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Utf32CodePointIterator() = default;
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~Utf32CodePointIterator() = default;
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bool operator==(Utf32CodePointIterator const& other) const
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{
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return m_ptr == other.m_ptr && m_length == other.m_length;
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}
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Utf32CodePointIterator& operator++()
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{
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VERIFY(m_length > 0);
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m_ptr++;
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m_length--;
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return *this;
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}
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ssize_t operator-(Utf32CodePointIterator const& other) const
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{
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return m_ptr - other.m_ptr;
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}
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u32 operator*() const
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{
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VERIFY(m_length > 0);
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return *m_ptr;
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}
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// NOTE: This returns {} if the peek is at or past EOF.
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Optional<u32> peek(size_t offset = 0) const;
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constexpr int code_point_length_in_bytes() const { return sizeof(u32); }
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bool done() const { return !m_length; }
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private:
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Utf32CodePointIterator(u32 const* ptr, size_t length)
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: m_ptr(ptr)
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, m_length((ssize_t)length)
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{
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}
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u32 const* m_ptr { nullptr };
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ssize_t m_length { -1 };
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};
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class Utf32View {
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public:
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using Iterator = Utf32CodePointIterator;
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Utf32View() = default;
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Utf32View(u32 const* code_points, size_t length)
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: m_code_points(code_points)
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, m_length(length)
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{
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VERIFY(code_points || length == 0);
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}
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Utf32CodePointIterator begin() const
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{
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return { begin_ptr(), m_length };
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}
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Utf32CodePointIterator end() const
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{
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return { end_ptr(), 0 };
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}
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u32 at(size_t index) const
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{
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VERIFY(index < m_length);
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return m_code_points[index];
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}
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u32 operator[](size_t index) const { return at(index); }
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u32 const* code_points() const { return m_code_points; }
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bool is_empty() const { return m_length == 0; }
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bool is_null() const { return !m_code_points; }
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size_t length() const { return m_length; }
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size_t iterator_offset(Utf32CodePointIterator const& it) const
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{
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VERIFY(it.m_ptr >= m_code_points);
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VERIFY(it.m_ptr < m_code_points + m_length);
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return ((ptrdiff_t)it.m_ptr - (ptrdiff_t)m_code_points) / sizeof(u32);
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}
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Utf32View substring_view(size_t offset, size_t length) const
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{
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VERIFY(offset <= m_length);
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VERIFY(!Checked<size_t>::addition_would_overflow(offset, length));
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VERIFY((offset + length) <= m_length);
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return Utf32View(m_code_points + offset, length);
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}
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Utf32View substring_view(size_t offset) const
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{
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return substring_view(offset, length() - offset);
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}
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private:
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u32 const* begin_ptr() const
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{
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return m_code_points;
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}
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u32 const* end_ptr() const
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{
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return m_code_points + m_length;
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}
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u32 const* m_code_points { nullptr };
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size_t m_length { 0 };
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};
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template<>
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struct Formatter<Utf32View> : Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder&, Utf32View const&);
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};
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}
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#if USING_AK_GLOBALLY
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using AK::Utf32View;
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#endif
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