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style: Implement the functional :host(..) selector.

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We could invalidate in a slightly more fine-grained way, but I don't think it's
worth the churn vs. keeping the special-cases minimal.

Bug: 1452640
Reviewed-by: xidorn
MozReview-Commit-ID: 5DkQrgwg9GW
This commit is contained in:
Emilio Cobos Álvarez 2018-04-09 23:23:17 +02:00
parent bfb9fe6159
commit eaefaa890e
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GPG key ID: 056B727BB9C1027C
8 changed files with 82 additions and 47 deletions
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20
components/selectors/matching.rs
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@ -692,10 +692,10 @@ where
match *selector {
Component::Combinator(_) => unreachable!(),
Component::Slotted(ref selector) => {
// <slots> are never flattened tree slottables.
!element.is_html_slot_element() &&
element.assigned_slot().is_some() &&
context.shared.nest(|context| {
// <slots> are never flattened tree slottables.
!element.is_html_slot_element() &&
element.assigned_slot().is_some() &&
matches_complex_selector(
selector.iter(),
element,
@ -814,8 +814,18 @@ where
flags_setter(element, ElementSelectorFlags::HAS_EMPTY_SELECTOR);
element.is_empty()
}
Component::Host => {
context.shared.shadow_host().map_or(false, |host| host == element.opaque())
Component::Host(ref selector) => {
context.shared.shadow_host().map_or(false, |host| host == element.opaque()) &&
selector.as_ref().map_or(true, |selector| {
context.shared.nest(|context| {
matches_complex_selector(
selector.iter(),
element,
context,
flags_setter,
)
})
})
}
Component::Scope => {
match context.shared.scope_element {