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Utf16FlyString more or less works exactly the same as FlyString. It will store the raw encoded data of the string instance. If the string is a short ASCII string, Utf16FlyString holds the ShortString bytes; else, Utf16FlyString holds a pointer to the Utf16StringData.
110 lines
3.2 KiB
C++
110 lines
3.2 KiB
C++
/*
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* Copyright (c) 2025, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/HashTable.h>
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#include <AK/Singleton.h>
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#include <AK/Utf16FlyString.h>
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namespace AK {
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struct Utf16FlyStringTableHashTraits : public Traits<Detail::Utf16StringData const*> {
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static u32 hash(Detail::Utf16StringData const* string) { return string->hash(); }
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static bool equals(Detail::Utf16StringData const* a, Detail::Utf16StringData const* b) { return *a == *b; }
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};
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static auto& all_utf16_fly_strings()
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{
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static Singleton<HashTable<Detail::Utf16StringData const*, Utf16FlyStringTableHashTraits>> table;
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return *table;
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}
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namespace Detail {
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void did_destroy_utf16_fly_string_data(Badge<Detail::Utf16StringData>, Detail::Utf16StringData const& data)
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{
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all_utf16_fly_strings().remove(&data);
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}
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}
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template<typename ViewType>
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Optional<Utf16FlyString> Utf16FlyString::create_fly_string_from_cache(ViewType const& string)
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{
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if (string.is_empty())
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return {};
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if constexpr (IsSame<ViewType, StringView>) {
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if (string.length() <= Detail::MAX_SHORT_STRING_BYTE_COUNT && string.is_ascii())
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return Utf16String::from_utf8_without_validation(string);
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} else {
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if (string.length_in_code_units() <= Detail::MAX_SHORT_STRING_BYTE_COUNT && string.is_ascii())
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return Utf16String::from_utf16_without_validation(string);
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}
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if (auto it = all_utf16_fly_strings().find(string.hash(), [&](auto const& entry) { return *entry == string; }); it != all_utf16_fly_strings().end())
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return Utf16FlyString { Detail::Utf16StringBase(**it) };
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return {};
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}
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Utf16FlyString Utf16FlyString::from_utf8(StringView string)
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{
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if (auto result = create_fly_string_from_cache(string); result.has_value())
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return result.release_value();
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return Utf16String::from_utf8(string);
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}
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Utf16FlyString Utf16FlyString::from_utf8_without_validation(StringView string)
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{
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if (auto result = create_fly_string_from_cache(string); result.has_value())
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return result.release_value();
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return Utf16String::from_utf8_without_validation(string);
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}
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Utf16FlyString Utf16FlyString::from_utf16(Utf16View const& string)
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{
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if (auto result = create_fly_string_from_cache(string); result.has_value())
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return result.release_value();
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return Utf16String::from_utf16(string);
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}
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Utf16FlyString Utf16FlyString::from_utf16_without_validation(Utf16View const& string)
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{
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if (auto result = create_fly_string_from_cache(string); result.has_value())
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return result.release_value();
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return Utf16String::from_utf16_without_validation(string);
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}
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Utf16FlyString::Utf16FlyString(Utf16String const& string)
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{
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if (string.has_short_ascii_storage()) {
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m_data = string;
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return;
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}
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auto const* data = string.data({});
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if (data->is_fly_string()) {
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m_data = string;
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return;
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}
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if (auto it = all_utf16_fly_strings().find(data); it == all_utf16_fly_strings().end()) {
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m_data = string;
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all_utf16_fly_strings().set(data);
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data->mark_as_fly_string({});
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} else {
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m_data.set_data({}, *it);
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}
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}
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size_t Utf16FlyString::number_of_utf16_fly_strings()
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{
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return all_utf16_fly_strings().size();
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}
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}
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