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137 lines
3.9 KiB
C++
137 lines
3.9 KiB
C++
/*
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* Copyright (c) 2021-2023, Tim Flynn <trflynn89@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/DeprecatedString.h>
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#include <AK/Error.h>
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#include <AK/Format.h>
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#include <AK/Forward.h>
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#include <AK/Optional.h>
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#include <AK/Span.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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namespace AK {
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using Utf16Data = Vector<u16, 1>;
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ErrorOr<Utf16Data> utf8_to_utf16(StringView);
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ErrorOr<Utf16Data> utf8_to_utf16(Utf8View const&);
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ErrorOr<Utf16Data> utf32_to_utf16(Utf32View const&);
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ErrorOr<void> code_point_to_utf16(Utf16Data&, u32);
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class Utf16View;
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class Utf16CodePointIterator {
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friend class Utf16View;
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public:
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Utf16CodePointIterator() = default;
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~Utf16CodePointIterator() = default;
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bool operator==(Utf16CodePointIterator const& other) const
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{
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return (m_ptr == other.m_ptr) && (m_remaining_code_units == other.m_remaining_code_units);
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}
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Utf16CodePointIterator& operator++();
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u32 operator*() const;
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size_t length_in_code_units() const;
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private:
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Utf16CodePointIterator(u16 const* ptr, size_t length)
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: m_ptr(ptr)
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, m_remaining_code_units(length)
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{
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}
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u16 const* m_ptr { nullptr };
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size_t m_remaining_code_units { 0 };
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};
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class Utf16View {
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public:
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static bool is_high_surrogate(u16);
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static bool is_low_surrogate(u16);
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static u32 decode_surrogate_pair(u16 high_surrogate, u16 low_surrogate);
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Utf16View() = default;
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~Utf16View() = default;
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explicit Utf16View(ReadonlySpan<u16> code_units)
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: m_code_units(code_units)
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{
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}
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bool operator==(Utf16View const& other) const { return m_code_units == other.m_code_units; }
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enum class AllowInvalidCodeUnits {
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Yes,
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No,
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};
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ErrorOr<DeprecatedString> to_deprecated_string(AllowInvalidCodeUnits = AllowInvalidCodeUnits::No) const;
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ErrorOr<String> to_utf8(AllowInvalidCodeUnits = AllowInvalidCodeUnits::No) const;
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bool is_null() const { return m_code_units.is_null(); }
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bool is_empty() const { return m_code_units.is_empty(); }
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size_t length_in_code_units() const { return m_code_units.size(); }
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size_t length_in_code_points() const;
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Utf16CodePointIterator begin() const { return { begin_ptr(), m_code_units.size() }; }
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Utf16CodePointIterator end() const { return { end_ptr(), 0 }; }
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u16 const* data() const { return m_code_units.data(); }
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u16 code_unit_at(size_t index) const;
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u32 code_point_at(size_t index) const;
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size_t code_point_offset_of(size_t code_unit_offset) const;
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size_t code_unit_offset_of(size_t code_point_offset) const;
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size_t code_unit_offset_of(Utf16CodePointIterator const&) const;
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Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const;
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Utf16View substring_view(size_t code_unit_offset) const { return substring_view(code_unit_offset, length_in_code_units() - code_unit_offset); }
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Utf16View unicode_substring_view(size_t code_point_offset, size_t code_point_length) const;
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Utf16View unicode_substring_view(size_t code_point_offset) const { return unicode_substring_view(code_point_offset, length_in_code_points() - code_point_offset); }
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bool validate(size_t& valid_code_units) const;
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bool validate() const
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{
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size_t valid_code_units;
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return validate(valid_code_units);
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}
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bool equals_ignoring_case(Utf16View const&) const;
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private:
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u16 const* begin_ptr() const { return m_code_units.data(); }
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u16 const* end_ptr() const { return begin_ptr() + m_code_units.size(); }
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size_t calculate_length_in_code_points() const;
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ReadonlySpan<u16> m_code_units;
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mutable Optional<size_t> m_length_in_code_points;
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};
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}
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template<>
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struct AK::Formatter<AK::Utf16View> : Formatter<FormatString> {
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ErrorOr<void> format(FormatBuilder& builder, AK::Utf16View const& value)
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{
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return builder.builder().try_append(value);
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}
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};
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#if USING_AK_GLOBALLY
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using AK::Utf16Data;
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using AK::Utf16View;
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#endif
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