024367d82e
It's very common to encounter single-character strings in JavaScript on the web. We can make such strings significantly lighter by having a 1-character inline capacity on the Vectors.
120 lines
2.5 KiB
C++
120 lines
2.5 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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#include <AK/StringView.h>
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#include <AK/Utf16View.h>
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#include <LibJS/Runtime/Utf16String.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(Vector<u16, 1> 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(Vector<u16, 1> 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 const& string)
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{
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return create(AK::utf8_to_utf16(string));
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}
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NonnullRefPtr<Utf16StringImpl> Utf16StringImpl::create(Utf16View const& view)
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{
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Vector<u16, 1> string;
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string.ensure_capacity(view.length_in_code_units());
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string.append(view.data(), view.length_in_code_units());
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return create(move(string));
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}
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Vector<u16, 1> 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 Utf16View { m_string };
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}
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}
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Utf16String::Utf16String()
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: m_string(Detail::the_empty_utf16_string())
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{
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}
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Utf16String::Utf16String(Vector<u16, 1> string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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Utf16String::Utf16String(StringView const& string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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Utf16String::Utf16String(Utf16View const& string)
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: m_string(Detail::Utf16StringImpl::create(move(string)))
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{
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}
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Vector<u16, 1> 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 view().to_utf8(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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