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LibWeb: Implement :host and :host(<compound-selector>) selector matching

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The :host family of pseudo class selectors select the shadow host
element when matching against a rule from within the element's shadow
tree.

This is a bit convoluted due to the fact that the document-level
StyleComputer keeps track of *all* style rules, and not just the
document-level ones.

In the future, we should refactor style storage so that shadow roots
have their own style scope, and we can simplify a lot of this.
This commit is contained in:
Andreas Kling 2024-07-23 15:22:28 +02:00 • committed by Andreas Kling
commit 4c326fc5f6
Notes: github-actions[bot] 2024-07-23 16:04:40 +00:00
7 changed files with 127 additions and 44 deletions
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4
Userland/Libraries/LibWeb/CSS/SelectorEngine.h
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@ -16,9 +16,9 @@ enum class SelectorKind {
Relative,
};
bool matches(CSS::Selector const&, Optional<CSS::CSSStyleSheet const&> style_sheet_for_rule, DOM::Element const&, Optional<CSS::Selector::PseudoElement::Type> = {}, JS::GCPtr<DOM::ParentNode const> scope = {}, SelectorKind selector_kind = SelectorKind::Normal);
bool matches(CSS::Selector const&, Optional<CSS::CSSStyleSheet const&> style_sheet_for_rule, DOM::Element const&, JS::GCPtr<DOM::Element const> shadow_host, Optional<CSS::Selector::PseudoElement::Type> = {}, JS::GCPtr<DOM::ParentNode const> scope = {}, SelectorKind selector_kind = SelectorKind::Normal);
[[nodiscard]] bool fast_matches(CSS::Selector const&, Optional<CSS::CSSStyleSheet const&> style_sheet_for_rule, DOM::Element const&);
[[nodiscard]] bool fast_matches(CSS::Selector const&, Optional<CSS::CSSStyleSheet const&> style_sheet_for_rule, DOM::Element const&, JS::GCPtr<DOM::Element const> shadow_host);
[[nodiscard]] bool can_use_fast_matches(CSS::Selector const&);
}