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510bbcd8e0
The current method of iterating through the string to access a code point hurts performance quite badly for very large strings. The test262 test "RegExp/property-escapes/generated/Any.js" previously took 3 hours to complete; this one change brings it down to under 10 seconds.
122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/*
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* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
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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/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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Vector<u16> utf8_to_utf16(StringView const&);
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Vector<u16> utf8_to_utf16(Utf8View const&);
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Vector<u16> utf32_to_utf16(Utf32View const&);
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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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bool operator!=(Utf16CodePointIterator const& other) const
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{
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return !(*this == other);
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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(Span<u16 const> 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;
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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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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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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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Span<u16 const> 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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using AK::Utf16View;
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