f7ff1fd985
This relied on pulling the current realm from the main thread VM, which requires an execution context to be on the VM's stack. This heavily relied on the dummy execution context that is always on the stack, for example, when parsing the UA style sheets where no JavaScript is running.
88 lines
2.1 KiB
C++
88 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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JS::Handle<JS::Realm> realm;
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bool evaluate() const;
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ErrorOr<String> to_string() const;
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};
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struct Selector {
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String selector;
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JS::Handle<JS::Realm> realm;
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bool evaluate() const;
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ErrorOr<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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bool evaluate() const;
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ErrorOr<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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bool evaluate() const;
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ErrorOr<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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bool evaluate() const;
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ErrorOr<String> to_string() const;
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};
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static NonnullRefPtr<Supports> create(NonnullOwnPtr<Condition>&& condition)
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{
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return adopt_ref(*new Supports(move(condition)));
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}
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bool matches() const { return m_matches; }
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ErrorOr<String> to_string() const;
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private:
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Supports(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, TRY(in_parens.to_string()));
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}
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};
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