a3e4535f34
When someone calls PrimitiveString::utf16_string() on a rope string, we know for sure that the client wants a UTF-16 string and may not be interested in a UTF-8 version at all. To avoid round-tripping through UTF-8 in this scenario, callers can now inform resolve_rope_if_needed() about their preferred encoding, should rope resolution take place. The UTF-16 case is actually a lot simpler than the UTF-8 case, since we can simply ask for UTF-16 data for each fiber of the rope, and then concatenate all the fibers. Since LibJS always uses UTF-16 for regular expression matching, this avoids round-tripping through UTF-8 whenever the input to a regex test is already UTF-16. :^)
78 lines
2.6 KiB
C++
78 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.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/DeprecatedString.h>
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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 <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 final : public Cell {
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JS_CELL(PrimitiveString, Cell);
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public:
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, Utf16String);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, String);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, FlyString const&);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, DeprecatedString);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, DeprecatedFlyString const&);
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[[nodiscard]] static NonnullGCPtr<PrimitiveString> create(VM&, PrimitiveString&, PrimitiveString&);
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static ThrowCompletionOr<NonnullGCPtr<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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ThrowCompletionOr<String> utf8_string() const;
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ThrowCompletionOr<StringView> utf8_string_view() const;
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bool has_utf8_string() const { return m_utf8_string.has_value(); }
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ThrowCompletionOr<DeprecatedString> deprecated_string() const;
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bool has_deprecated_string() const { return m_deprecated_string.has_value(); }
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ThrowCompletionOr<Utf16String> utf16_string() const;
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ThrowCompletionOr<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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private:
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explicit PrimitiveString(PrimitiveString&, PrimitiveString&);
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explicit PrimitiveString(String);
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explicit PrimitiveString(DeprecatedString);
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explicit PrimitiveString(Utf16String);
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virtual void visit_edges(Cell::Visitor&) override;
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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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ThrowCompletionOr<void> resolve_rope_if_needed(EncodingPreference) const;
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mutable bool m_is_rope { false };
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mutable GCPtr<PrimitiveString> m_lhs;
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mutable GCPtr<PrimitiveString> m_rhs;
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mutable Optional<String> m_utf8_string;
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mutable Optional<DeprecatedString> m_deprecated_string;
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mutable Optional<Utf16String> m_utf16_string;
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};
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}
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