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e0be17e4fb
CSS Syntax 3 (https://drafts.csswg.org/css-syntax) has changed significantly since we implemented it a couple of years ago. Just about every parsing algorithm has been rewritten in terms of the new token stream concept, and to support nested styles. As all of those algorithms call into each other, this is an unfortunately chonky diff. As part of this, the transitory types (Declaration, Function, AtRule...) have been rewritten. That's both because we have new requirements of what they should be and contain, and also because the spec asks us to create and then gradually modify them in place, which is easier if they are plain structs.
85 lines
2 KiB
C++
85 lines
2 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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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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