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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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44
components/selectors/parser.rs
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@ -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),