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style: Implement selector-matching for ::part().

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Also fairly straight-forward. This may get more complicated when we do part
forwarding, if any.

I've opened https://github.com/w3c/csswg-drafts/issues/3841 in what I think
would be a cleaner model for forwarding.

Differential Revision: https://phabricator.services.mozilla.com/D28063
This commit is contained in:
Emilio Cobos Álvarez 2019-05-01 17:28:23 +00:00
parent a23ad3be50
commit 627514b737
4 changed files with 40 additions and 12 deletions
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17
components/style/gecko/wrapper.rs
View file

@ -573,6 +573,11 @@ impl<'le> GeckoElement<'le> {
}
}
#[inline(always)]
fn get_part_attr(&self) -> Option<&structs::nsAttrValue> {
snapshot_helpers::find_attr(self.attrs(), &atom!("part"))
}
#[inline(always)]
fn get_class_attr(&self) -> Option<&structs::nsAttrValue> {
if !self.may_have_class() {
@ -2259,8 +2264,14 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
case_sensitivity.eq_atom(element_id, id)
}
fn is_part(&self, _name: &Atom) -> bool {
unimplemented!();
#[inline]
fn is_part(&self, name: &Atom) -> bool {
let attr = match self.get_part_attr() {
Some(c) => c,
None => return false,
};
snapshot_helpers::has_class_or_part(name, CaseSensitivity::CaseSensitive, attr)
}
#[inline(always)]
@ -2270,7 +2281,7 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
None => return false,
};
snapshot_helpers::has_class(name, case_sensitivity, attr)
snapshot_helpers::has_class_or_part(name, case_sensitivity, attr)
}
#[inline]