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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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2
components/selectors/builder.rs
View file

@ -314,7 +314,7 @@ fn complex_selector_specificity<Impl>(mut iter: slice::Iter<Component<Impl>>)
Component::FirstChild | Component::LastChild |
Component::OnlyChild | Component::Root |
Component::Empty | Component::Scope |
Component::Host |
Component::Host(..) |
Component::NthChild(..) |
Component::NthLastChild(..) |
Component::NthOfType(..) |

20
components/selectors/matching.rs
View file

@ -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 {

44
components/selectors/parser.rs
View file

@ -381,11 +381,14 @@ where
}
match *self {
Slotted(ref selectors) => {
for selector in selectors.iter() {
if !selector.visit(visitor) {
return false;
}
Slotted(ref selector) => {
if !selector.visit(visitor) {
return false;
}
}
Host(Some(ref selector)) => {
if !selector.visit(visitor) {
return false;
}
}
Negation(ref negated) => {
@ -618,7 +621,7 @@ impl<'a, Impl: 'a + SelectorImpl> SelectorIter<'a, Impl> {
/// combinators to the left.
#[inline]
pub(crate) fn is_featureless_host_selector(&mut self) -> bool {
self.all(|component| matches!(*component, Component::Host)) &&
self.all(|component| matches!(*component, Component::Host(..))) &&
self.next_sequence().is_none()
}
@ -793,10 +796,6 @@ pub enum Component<Impl: SelectorImpl> {
Root,
Empty,
Scope,
/// The `:host` pseudo-class:
///
/// https://drafts.csswg.org/css-scoping/#host-selector
Host,
NthChild(i32, i32),
NthLastChild(i32, i32),
NthOfType(i32, i32),
@ -815,7 +814,19 @@ pub enum Component<Impl: SelectorImpl> {
/// NOTE(emilio): This should support a list of selectors, but as of this
/// writing no other browser does, and that allows them to put ::slotted()
/// in the rule hash, so we do that too.
///
/// See https://github.com/w3c/csswg-drafts/issues/2158
Slotted(Selector<Impl>),
/// The `:host` pseudo-class:
///
/// https://drafts.csswg.org/css-scoping/#host-selector
///
/// NOTE(emilio): This should support a list of selectors, but as of this
/// writing no other browser does, and that allows them to put :host()
/// in the rule hash, so we do that too.
///
/// See https://github.com/w3c/csswg-drafts/issues/2158
Host(Option<Selector<Impl>>),
PseudoElement(Impl::PseudoElement),
}
@ -1119,7 +1130,15 @@ impl<Impl: SelectorImpl> ToCss for Component<Impl> {
Root => dest.write_str(":root"),
Empty => dest.write_str(":empty"),
Scope => dest.write_str(":scope"),
Host => dest.write_str(":host"),
Host(ref selector) => {
dest.write_str(":host")?;
if let Some(ref selector) = *selector {
dest.write_char('(')?;
selector.to_css(dest)?;
dest.write_char(')')?;
}
Ok(())
},
FirstOfType => dest.write_str(":first-of-type"),
LastOfType => dest.write_str(":last-of-type"),
OnlyOfType => dest.write_str(":only-of-type"),
@ -1816,6 +1835,7 @@ where
"nth-of-type" => return Ok(parse_nth_pseudo_class(input, Component::NthOfType)?),
"nth-last-child" => return Ok(parse_nth_pseudo_class(input, Component::NthLastChild)?),
"nth-last-of-type" => return Ok(parse_nth_pseudo_class(input, Component::NthLastOfType)?),
"host" => return Ok(Component::Host(Some(parse_inner_compound_selector(parser, input)?))),
"not" => {
if inside_negation {
return Err(input.new_custom_error(
@ -1969,7 +1989,7 @@ where
"root" => Ok(Component::Root),
"empty" => Ok(Component::Empty),
"scope" => Ok(Component::Scope),
"host" if P::parse_host(parser) => Ok(Component::Host),
"host" if P::parse_host(parser) => Ok(Component::Host(None)),
"first-of-type" => Ok(Component::FirstOfType),
"last-of-type" => Ok(Component::LastOfType),
"only-of-type" => Ok(Component::OnlyOfType),

8
components/style/dom.rs
View file

@ -794,6 +794,14 @@ pub trait TElement
);
}
if let Some(shadow) = self.shadow_root() {
f(
shadow.style_data(),
self.as_node().owner_doc().quirks_mode(),
Some(shadow.host()),
);
}
let mut current = self.assigned_slot();
while let Some(slot) = current {
// Slots can only have assigned nodes when in a shadow tree.

19
components/style/invalidation/element/invalidation_map.rs
View file

@ -207,16 +207,6 @@ impl InvalidationMap {
})
}
/// Adds a selector to this `InvalidationMap`. Returns Err(..) to
/// signify OOM.
pub fn note_selector(
&mut self,
selector: &Selector<SelectorImpl>,
quirks_mode: QuirksMode,
) -> Result<(), FailedAllocationError> {
self.collect_invalidations_for(selector, quirks_mode)
}
/// Clears this map, leaving it empty.
pub fn clear(&mut self) {
self.class_to_selector.clear();
@ -228,13 +218,14 @@ impl InvalidationMap {
self.has_class_attribute_selectors = false;
}
// Returns Err(..) to signify OOM.
fn collect_invalidations_for(
/// Adds a selector to this `InvalidationMap`. Returns Err(..) to
/// signify OOM.
pub fn note_selector(
&mut self,
selector: &Selector<SelectorImpl>,
quirks_mode: QuirksMode
quirks_mode: QuirksMode,
) -> Result<(), FailedAllocationError> {
debug!("InvalidationMap::collect_invalidations_for({:?})", selector);
debug!("InvalidationMap::note_selector({:?})", selector);
let mut iter = selector.iter();
let mut combinator;

30
components/style/invalidation/element/invalidator.rs
View file

@ -6,7 +6,7 @@
//! element styles need to be invalidated.
use context::StackLimitChecker;
use dom::{TElement, TNode};
use dom::{TElement, TNode, TShadowRoot};
use selector_parser::SelectorImpl;
use selectors::matching::{CompoundSelectorMatchingResult, MatchingContext};
use selectors::matching::matches_compound_selector_from;
@ -534,20 +534,22 @@ where
let mut any_descendant = false;
// NOTE(emilio): This should not be needed for Shadow DOM for normal
// element state / attribute invalidations (it's needed for XBL though,
// due to the weird way the anon content there works (it doesn't block
// combinators)).
// NOTE(emilio): This is only needed for Shadow DOM to invalidate
// correctly on :host(..) changes. Instead of doing this, we could add
// a third kind of invalidation list that walks shadow root children,
// but it's not clear it's worth it.
//
// However, it's needed as of right now for document state invalidation,
// were we rely on iterating every element that ends up in the composed
// doc.
//
// Also, we could avoid having that special-case for document state
// invalidations if we invalidate for document state changes per
// subtree, though that's kind of annoying because we need to invalidate
// the shadow host subtree (to handle :host and ::slotted), and the
// actual shadow tree (to handle all other rules in the ShadowRoot).
// Also, it's needed as of right now for document state invalidation,
// where we rely on iterating every element that ends up in the composed
// doc, but we could fix that invalidating per subtree.
if let Some(root) = self.element.shadow_root() {
any_descendant |=
self.invalidate_dom_descendants_of(root.as_node(), invalidations);
}
// This is needed for XBL (technically) unconditionally, because XBL
// bindings do not block combinators in any way. However this is kinda
// broken anyway, since we should be looking at XBL rules too.
if let Some(anon_content) = self.element.xbl_binding_anonymous_content() {
any_descendant |=
self.invalidate_dom_descendants_of(anon_content, invalidations);

1
components/style/selector_map.rs
View file

@ -457,6 +457,7 @@ fn specific_bucket_for<'a>(
//
// Meanwhile taking the code path below is slower, but still correct.
// Component::Slotted(ref selector) => find_bucket(selector.iter()),
Component::Host(Some(ref selector)) => find_bucket(selector.iter()),
_ => Bucket::Universal
}
}

5
components/style/stylist.rs
View file

@ -2238,7 +2238,10 @@ impl CascadeData {
);
if rebuild_kind.should_rebuild_invalidation() {
self.invalidation_map.note_selector(&rule.selector, quirks_mode)?;
self.invalidation_map.note_selector(
selector,
quirks_mode,
)?;
let mut visitor = StylistSelectorVisitor {
needs_revalidation: false,
passed_rightmost_selector: false,