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5aba457009
A couple of arbitrary substitution functions require us to get or produce some style value, and then substitute its ComponentValues into the original ComponentValue list. So this commit gives CSSStyleValue a tokenize() method that does so. Apart from a couple of unusual cases like the guaranteed-invalid value, style values can all be converted into ComponentValues by serializing them as a string, and then parsing that as a list of component values. That feels unnecessarily inefficient in most cases though, so I've implemented faster overrides for a lot of the basic style value classes, but left that serialize-and-reparse method as the fallback.
40 lines
1.4 KiB
C++
40 lines
1.4 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/CSSStyleValue.h>
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namespace Web::CSS {
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// https://drafts.csswg.org/css-values-5/#pending-substitution-value
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class PendingSubstitutionStyleValue final : public StyleValueWithDefaultOperators<PendingSubstitutionStyleValue> {
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public:
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static ValueComparingNonnullRefPtr<PendingSubstitutionStyleValue> create()
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{
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static ValueComparingNonnullRefPtr<PendingSubstitutionStyleValue> instance = adopt_ref(*new (nothrow) PendingSubstitutionStyleValue());
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return instance;
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}
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virtual ~PendingSubstitutionStyleValue() override = default;
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virtual String to_string(SerializationMode) const override { return {}; }
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virtual Vector<Parser::ComponentValue> tokenize() const override
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{
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// Not sure what to do here, but this isn't valid so returning GIV seems the most correct.
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return { Parser::ComponentValue { Parser::GuaranteedInvalidValue {} } };
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}
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// We shouldn't need to compare these, but in case we do: The nature of them is that their value is unknown, so
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// consider them all to be unique.
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bool properties_equal(PendingSubstitutionStyleValue const&) const { return false; }
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private:
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PendingSubstitutionStyleValue()
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: StyleValueWithDefaultOperators(Type::PendingSubstitution)
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{
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}
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};
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}
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