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85e14f5f1f
Treat a scoped `@import` rule as a scope descriptor while traversing style-producing rules from imported stylesheets. Imported rules now inherit an outer scope for unscoped imports and replace it when the import itself carries scope(...). Scope resolution was generalized to handle both CSSScopeRule and CSSImportRule descriptors. Import-scope boundaries are matched using the stylesheet that parsed the `@import` rule, while normal imported selectors keep using the imported stylesheet context. This lets implicit scopes, nested `@scope` rules, :scope, and top-level `&` behave as the Cascade 6 model requires.
60 lines
2.3 KiB
C++
60 lines
2.3 KiB
C++
/*
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* Copyright (c) 2026, 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 <AK/Optional.h>
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#include <LibWeb/CSS/CSSGroupingRule.h>
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#include <LibWeb/CSS/Selector.h>
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#include <LibWeb/Forward.h>
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namespace Web::CSS {
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// https://drafts.csswg.org/css-cascade-6/#the-cssscoperule-interface
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class CSSScopeRule final : public CSSGroupingRule {
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WEB_PLATFORM_OBJECT(CSSScopeRule, CSSGroupingRule);
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GC_DECLARE_ALLOCATOR(CSSScopeRule);
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public:
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[[nodiscard]] static GC::Ref<CSSScopeRule> create(JS::Realm&, Optional<SelectorList>&& start_selectors, Optional<SelectorList>&& end_selectors, CSSRuleList&);
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virtual ~CSSScopeRule() override;
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Optional<SelectorList> const& start_selectors() const { return m_start_selectors; }
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Optional<SelectorList> const& end_selectors() const { return m_end_selectors; }
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Optional<SelectorList> const& start_selectors_for_matching() const;
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Optional<SelectorList> const& end_selectors_for_matching() const;
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GC::Ptr<CSSScopeRule const> nearest_ancestor_scope_rule() const;
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Optional<String> start() const;
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Optional<String> end() const;
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private:
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CSSScopeRule(JS::Realm&, Optional<SelectorList>&& start_selectors, Optional<SelectorList>&& end_selectors, CSSRuleList&);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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virtual void clear_caches() override;
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virtual String serialized() const override;
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virtual void dump(StringBuilder&, int indent_levels) const override;
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Optional<SelectorList> m_start_selectors;
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Optional<SelectorList> m_end_selectors;
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mutable Optional<SelectorList> m_cached_start_selectors_for_matching;
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mutable Optional<SelectorList> m_cached_end_selectors_for_matching;
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mutable Optional<GC::Ptr<CSSScopeRule const>> m_cached_nearest_ancestor_scope_rule;
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};
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template<>
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inline bool CSSRule::fast_is<CSSScopeRule>() const { return type() == CSSRule::Type::Scope; }
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SelectorList adapt_scope_end_selectors_for_matching(SelectorList const&);
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Optional<SelectorList> const& scope_start_selectors_for_matching(CSSRule const&);
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Optional<SelectorList> const& scope_end_selectors_for_matching(CSSRule const&);
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GC::Ptr<CSSImportRule const> nearest_scoped_owner_import(CSSStyleSheet const*);
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GC::Ptr<CSSRule const> nearest_ancestor_scope_rule_for_matching(CSSRule const&);
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}
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