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style: Add simple parsing and matching support for :has

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Parsing is behind a config value `layout.css.has-selectors.enabled`. This
change does not support p:has(> a) combinators, but will handle them
gracefully, just not matching on them.

Differential Revision: https://phabricator.services.mozilla.com/D149515
This commit is contained in:
Tiaan Louw 2022-06-20 08:53:02 +00:00 • committed by Martin Robinson
parent dcdf9f33d5
commit 3d0cf4dbf9
8 changed files with 85 additions and 10 deletions
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5
components/style/gecko/selector_parser.rs
View file

@ -305,6 +305,11 @@ impl<'a, 'i> ::selectors::Parser<'i> for SelectorParser<'a> {
true
}
#[inline]
fn parse_has(&self) -> bool {
static_prefs::pref!("layout.css.has-selector.enabled")
}
#[inline]
fn parse_part(&self) -> bool {
true

12
components/style/gecko/wrapper.rs
View file

@ -1844,6 +1844,18 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
None
}
#[inline]
fn first_element_child(&self) -> Option<Self> {
let mut child = self.as_node().first_child();
while let Some(child_node) = child {
if let Some(el) = child_node.as_element() {
return Some(el);
}
child = child_node.next_sibling();
}
None
}
fn set_selector_flags(&self, flags: ElementSelectorFlags) {
debug_assert!(!flags.is_empty());
self.set_flags(selector_flags_to_node_flags(flags));