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LibJS: Add a simple reference-counted UTF-16 string

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To help alleviate memory usage when creating and copying large strings,
create a simple wrapper around a Vector<u16> to reference count UTF-16
strings.
This commit is contained in:
Timothy Flynn 2021-08-09 08:58:31 -04:00 • committed by Andreas Kling
parent 3322efd4cd
commit 02e7dceb96
4 changed files with 183 additions and 0 deletions
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61
Userland/Libraries/LibJS/Runtime/Utf16String.h Normal file
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/*
* Copyright (c) 2021, Tim Flynn <trflynn89@pm.me>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullRefPtr.h>
#include <AK/RefCounted.h>
#include <AK/String.h>
#include <AK/Types.h>
#include <AK/Vector.h>
namespace JS {
namespace Detail {
class Utf16StringImpl : public RefCounted<Utf16StringImpl> {
public:
~Utf16StringImpl() = default;
static NonnullRefPtr<Utf16StringImpl> create();
static NonnullRefPtr<Utf16StringImpl> create(Vector<u16>);
static NonnullRefPtr<Utf16StringImpl> create(StringView const&);
static NonnullRefPtr<Utf16StringImpl> create(Utf16View const&);
Vector<u16> const& string() const;
Utf16View view() const;
private:
Utf16StringImpl() = default;
explicit Utf16StringImpl(Vector<u16> string);
Vector<u16> m_string;
};
}
class Utf16String {
public:
Utf16String();
explicit Utf16String(Vector<u16>);
explicit Utf16String(StringView const&);
explicit Utf16String(Utf16View const&);
Vector<u16> const& string() const;
Utf16View view() const;
Utf16View substring_view(size_t code_unit_offset, size_t code_unit_length) const;
Utf16View substring_view(size_t code_unit_offset) const;
String to_utf8() const;
u16 code_unit_at(size_t index) const;
size_t length_in_code_units() const;
bool is_empty() const;
private:
NonnullRefPtr<Detail::Utf16StringImpl> m_string;
};
}