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"Arbitrary substitution functions" are a family of functions that includes var() and attr(). All of them resolve to an arbitrary set of component values that are not known at parse-time, so they have to be substituted at computed-value time. Besides it being nice to follow the spec closely, this means we'll be able to implement the others (such as `if()` and `inherit()`) more easily. The main omission here is the new "spread syntax", which can be implemented in the future.
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
/*
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* Copyright (c) 2025, Sam Atkins <sam@ladybird.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 <LibWeb/CSS/Parser/Parser.h>
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namespace Web::CSS::Parser {
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// https://drafts.csswg.org/css-values-5/#substitution-context
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struct SubstitutionContext {
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enum class DependencyType : u8 {
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Property,
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Attribute,
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Function,
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};
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DependencyType dependency_type;
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String first;
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Optional<String> second {};
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bool is_cyclic { false };
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bool operator==(SubstitutionContext const&) const;
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String to_string() const;
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};
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class GuardedSubstitutionContexts {
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public:
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void guard(SubstitutionContext&);
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void unguard(SubstitutionContext const&);
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private:
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Vector<SubstitutionContext&> m_contexts;
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};
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enum class ArbitrarySubstitutionFunction : u8 {
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Attr,
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Var,
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};
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[[nodiscard]] Optional<ArbitrarySubstitutionFunction> to_arbitrary_substitution_function(FlyString const& name);
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bool contains_guaranteed_invalid_value(Vector<ComponentValue> const&);
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[[nodiscard]] Vector<ComponentValue> substitute_arbitrary_substitution_functions(DOM::AbstractElement&, GuardedSubstitutionContexts&, Vector<ComponentValue> const&, Optional<SubstitutionContext> = {});
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using ArbitrarySubstitutionFunctionArguments = Vector<Vector<ComponentValue>>;
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[[nodiscard]] Optional<ArbitrarySubstitutionFunctionArguments> parse_according_to_argument_grammar(ArbitrarySubstitutionFunction, Vector<ComponentValue> const&);
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[[nodiscard]] Vector<ComponentValue> replace_an_arbitrary_substitution_function(DOM::AbstractElement&, GuardedSubstitutionContexts&, ArbitrarySubstitutionFunction, ArbitrarySubstitutionFunctionArguments const&);
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}
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