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https://github.com/LadybirdBrowser/ladybird.git
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b2a099e647
Before this change, every CSS @supports rule would keep the containing JS realm alive via a JS::Handle. This led to a GC reference cycle and the whole realm leaked. Since we only need the realm at construction time, we can take it as a parameter instead, and stop storing it.
87 lines
2.1 KiB
C++
87 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@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/NonnullOwnPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/String.h>
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#include <AK/Variant.h>
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#include <AK/Vector.h>
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#include <LibWeb/CSS/GeneralEnclosed.h>
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#include <LibWeb/CSS/Parser/Declaration.h>
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namespace Web::CSS {
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// https://www.w3.org/TR/css-conditional-4/#at-supports
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class Supports final : public RefCounted<Supports> {
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friend class Parser::Parser;
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public:
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struct Declaration {
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String declaration;
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[[nodiscard]] bool evaluate(JS::Realm&) const;
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String to_string() const;
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};
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struct Selector {
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String selector;
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[[nodiscard]] bool evaluate(JS::Realm&) const;
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String to_string() const;
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};
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struct Feature {
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Variant<Declaration, Selector> value;
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[[nodiscard]] bool evaluate(JS::Realm&) const;
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String to_string() const;
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};
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struct Condition;
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struct InParens {
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Variant<NonnullOwnPtr<Condition>, Feature, GeneralEnclosed> value;
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[[nodiscard]] bool evaluate(JS::Realm&) const;
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String to_string() const;
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};
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struct Condition {
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enum class Type {
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Not,
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And,
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Or,
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};
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Type type;
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Vector<InParens> children;
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[[nodiscard]] bool evaluate(JS::Realm&) const;
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String to_string() const;
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};
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static NonnullRefPtr<Supports> create(JS::Realm& realm, NonnullOwnPtr<Condition>&& condition)
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{
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return adopt_ref(*new Supports(realm, move(condition)));
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}
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bool matches() const { return m_matches; }
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String to_string() const;
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private:
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Supports(JS::Realm&, NonnullOwnPtr<Condition>&&);
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NonnullOwnPtr<Condition> m_condition;
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bool m_matches { false };
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};
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}
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template<>
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struct AK::Formatter<Web::CSS::Supports::InParens> : AK::Formatter<StringView> {
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ErrorOr<void> format(FormatBuilder& builder, Web::CSS::Supports::InParens const& in_parens)
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{
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return Formatter<StringView>::format(builder, in_parens.to_string());
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}
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};
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