mirror of
https://github.com/LadybirdBrowser/ladybird.git
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eea81738cd
For the slight cost of counting code points when converting between encodings and a teeny bit of memory, this commit adds a fast path for all-happy utf-16 substrings and code point operations. This seems to be a significant chunk of time spent in many regex benchmarks.
148 lines
3.3 KiB
C++
148 lines
3.3 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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#include <AK/StringView.h>
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#include <LibJS/Runtime/Utf16String.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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namespace Detail {
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static NonnullRefPtr<Utf16StringImpl> the_empty_utf16_string()
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{
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static NonnullRefPtr<Utf16StringImpl> empty_string = Utf16StringImpl::create();
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return empty_string;
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}
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Utf16StringImpl::Utf16StringImpl(Utf16Data string)
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: m_string(move(string))
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{
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create()
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{
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return adopt_ref(*new Utf16StringImpl);
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(Utf16Data string)
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{
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return adopt_ref(*new Utf16StringImpl(move(string)));
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(StringView string)
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{
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auto result = MUST(utf8_to_utf16(string));
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auto impl = create(move(result.data));
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impl->m_cached_view.unsafe_set_code_point_length(result.code_point_count);
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return impl;
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(Utf16View const& view)
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{
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Utf16Data string;
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string.ensure_capacity(view.length_in_code_units());
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string.unchecked_append(view.data(), view.length_in_code_units());
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auto impl = create(move(string));
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impl->m_cached_view.unsafe_set_code_point_length(view.length_in_code_units());
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return impl;
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}
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Utf16Data const& Utf16StringImpl::string() const
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{
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return m_string;
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}
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Utf16View Utf16StringImpl::view() const
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{
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return m_cached_view;
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}
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u32 Utf16StringImpl::compute_hash() const
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{
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if (m_string.is_empty())
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return 0;
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return string_hash((char const*)m_string.data(), m_string.size() * sizeof(u16));
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}
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}
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Utf16String Utf16String::create()
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{
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return Utf16String { Detail::the_empty_utf16_string() };
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}
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Utf16String Utf16String::create(Utf16Data string)
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{
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return Utf16String { Detail::Utf16StringImpl::create(move(string)) };
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}
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Utf16String Utf16String::create(StringView string)
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{
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return Utf16String { Detail::Utf16StringImpl::create(string) };
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}
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Utf16String Utf16String::create(Utf16View const& string)
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{
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return Utf16String { Detail::Utf16StringImpl::create(string) };
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}
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Utf16String Utf16String::invalid()
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{
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static auto invalid = Utf16String {};
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return invalid;
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}
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Utf16String::Utf16String(NonnullRefPtr<Detail::Utf16StringImpl> string)
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: m_string(move(string))
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{
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}
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Utf16Data const& Utf16String::string() const
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{
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return m_string->string();
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}
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Utf16View Utf16String::view() const
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{
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return m_string->view();
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}
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Utf16View Utf16String::substring_view(size_t code_unit_offset, size_t code_unit_length) const
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{
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return view().substring_view(code_unit_offset, code_unit_length);
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}
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Utf16View Utf16String::substring_view(size_t code_unit_offset) const
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{
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return view().substring_view(code_unit_offset);
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}
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String Utf16String::to_utf8() const
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{
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return MUST(view().to_utf8(Utf16View::AllowInvalidCodeUnits::Yes));
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}
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ByteString Utf16String::to_byte_string() const
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{
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return MUST(view().to_byte_string(Utf16View::AllowInvalidCodeUnits::Yes));
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}
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u16 Utf16String::code_unit_at(size_t index) const
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{
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return view().code_unit_at(index);
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}
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size_t Utf16String::length_in_code_units() const
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{
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return view().length_in_code_units();
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}
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bool Utf16String::is_empty() const
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{
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return view().is_empty();
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}
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}
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