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d78e3590d5
If we have two PrimitiveString objects that are both backed by UTF-16 data, we don't have to convert them to UTF-8 for equality checking. Just compare the underlying UTF-16 data. :^)
98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020-2025, Andreas Kling <andreas@ladybird.org>
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* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
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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/Optional.h>
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#include <AK/String.h>
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#include <AK/StringView.h>
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#include <LibGC/CellAllocator.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/Cell.h>
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#include <LibJS/Runtime/Completion.h>
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#include <LibJS/Runtime/Utf16String.h>
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#include <LibJS/Runtime/Value.h>
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namespace JS {
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class PrimitiveString : public Cell {
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GC_CELL(PrimitiveString, Cell);
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GC_DECLARE_ALLOCATOR(PrimitiveString);
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public:
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[[nodiscard]] static GC::Ref<PrimitiveString> create(VM&, Utf16String);
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[[nodiscard]] static GC::Ref<PrimitiveString> create(VM&, String);
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[[nodiscard]] static GC::Ref<PrimitiveString> create(VM&, FlyString const&);
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[[nodiscard]] static GC::Ref<PrimitiveString> create(VM&, PrimitiveString&, PrimitiveString&);
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[[nodiscard]] static GC::Ref<PrimitiveString> create(VM&, StringView);
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virtual ~PrimitiveString();
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PrimitiveString(PrimitiveString const&) = delete;
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PrimitiveString& operator=(PrimitiveString const&) = delete;
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bool is_empty() const;
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[[nodiscard]] String utf8_string() const;
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[[nodiscard]] StringView utf8_string_view() const;
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bool has_utf8_string() const { return m_utf8_string.has_value(); }
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[[nodiscard]] Utf16String utf16_string() const;
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[[nodiscard]] Utf16View utf16_string_view() const;
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bool has_utf16_string() const { return m_utf16_string.has_value(); }
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ThrowCompletionOr<Optional<Value>> get(VM&, PropertyKey const&) const;
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[[nodiscard]] bool operator==(PrimitiveString const&) const;
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protected:
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enum class RopeTag { Rope };
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explicit PrimitiveString(RopeTag)
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: m_is_rope(true)
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{
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}
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mutable bool m_is_rope { false };
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mutable Optional<String> m_utf8_string;
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mutable Optional<Utf16String> m_utf16_string;
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enum class EncodingPreference {
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UTF8,
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UTF16,
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};
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private:
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friend class RopeString;
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explicit PrimitiveString(String);
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explicit PrimitiveString(Utf16String);
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void resolve_rope_if_needed(EncodingPreference) const;
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};
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class RopeString final : public PrimitiveString {
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GC_CELL(RopeString, PrimitiveString);
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GC_DECLARE_ALLOCATOR(RopeString);
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public:
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virtual ~RopeString() override;
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private:
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friend class PrimitiveString;
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explicit RopeString(GC::Ref<PrimitiveString>, GC::Ref<PrimitiveString>);
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virtual void visit_edges(Visitor&) override;
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void resolve(EncodingPreference) const;
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mutable GC::Ptr<PrimitiveString> m_lhs;
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mutable GC::Ptr<PrimitiveString> m_rhs;
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};
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}
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