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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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12
components/style/gecko/snapshot_helpers.rs
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@ -29,7 +29,7 @@ unsafe fn ptr<T>(attr: &structs::nsAttrValue) -> *const T {
}
#[inline(always)]
unsafe fn get_class_from_attr(attr: &structs::nsAttrValue) -> Class {
unsafe fn get_class_or_part_from_attr(attr: &structs::nsAttrValue) -> Class {
debug_assert!(bindings::Gecko_AssertClassAttrValueIsSane(attr));
let base_type = base_type(attr);
if base_type == structs::nsAttrValue_ValueBaseType_eStringBase {
@ -82,15 +82,15 @@ pub fn get_id(attrs: &[structs::AttrArray_InternalAttr]) -> Option<&WeakAtom> {
Some(unsafe { get_id_from_attr(find_attr(attrs, &atom!("id"))?) })
}
/// Given a class name, a case sensitivity, and an array of attributes, returns
/// whether the class has the attribute that name represents.
/// Given a class or part name, a case sensitivity, and an array of attributes,
/// returns whether the attribute has that name.
#[inline(always)]
pub fn has_class(
pub fn has_class_or_part(
name: &Atom,
case_sensitivity: CaseSensitivity,
attr: &structs::nsAttrValue,
) -> bool {
match unsafe { get_class_from_attr(attr) } {
match unsafe { get_class_or_part_from_attr(attr) } {
Class::None => false,
Class::One(atom) => unsafe { case_sensitivity.eq_atom(name, WeakAtom::new(atom)) },
Class::More(atoms) => match case_sensitivity {
@ -114,7 +114,7 @@ where
F: FnMut(&Atom),
{
unsafe {
match get_class_from_attr(attr) {
match get_class_or_part_from_attr(attr) {
Class::None => {},
Class::One(atom) => Atom::with(atom, callback),
Class::More(atoms) => {