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style: Implement parsing / selector-matching for :is() and :where().

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This implements the easy / straight-forward parts of the :where / :is
selectors.

The biggest missing piece is to handle properly invalidation when there
are combinators present inside the :where. That's the hard part of this,
actually.

But this is probably worth landing in the interim. This fixes some of
the visitors that were easy to fix.

Differential Revision: https://phabricator.services.mozilla.com/D70788
This commit is contained in:
Emilio Cobos Álvarez 2020-04-17 13:37:59 +00:00
parent 66f14773c6
commit 83ea321096
10 changed files with 338 additions and 223 deletions
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8
components/selectors/matching.rs
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@ -851,6 +851,14 @@ where
matches_generic_nth_child(element, context, 0, 1, true, false, flags_setter) &&
matches_generic_nth_child(element, context, 0, 1, true, true, flags_setter)
},
Component::Is(ref list) | Component::Where(ref list) => context.shared.nest(|context| {
for selector in &**list {
if matches_complex_selector(selector.iter(), element, context, flags_setter) {
return true;
}
}
false
}),
Component::Negation(ref negated) => context.shared.nest_for_negation(|context| {
let mut local_context = LocalMatchingContext {
matches_hover_and_active_quirk: MatchesHoverAndActiveQuirk::No,