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style: Refactor the selector parser to make implementing ::part() easier.

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::slotted() is already weird in the sense that it supports a pseudo-element
afterwards (so ::slotted(*)::before is valid for example).

::part() is weirder because you are supposed to allow stuff like
::part(foo):hover, ::part(foo):hover::before, etc.

In order to avoid making the already-complex parse_compound_selector more
complex, shuffle stuff so that we pass the progress of our current compound
selector around, and is the parsing code for each selector which decides whether
it's ok to parse at the given point.

Differential Revision: https://phabricator.services.mozilla.com/D27158
This commit is contained in:
Emilio Cobos Álvarez 2019-04-16 13:16:56 +00:00
parent 498a163cdf
commit 09d497db3d
3 changed files with 191 additions and 193 deletions
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12
components/style/gecko/pseudo_element.rs
View file

@ -11,7 +11,7 @@
use crate::gecko_bindings::structs::{self, PseudoStyleType};
use crate::properties::longhands::display::computed_value::T as Display;
use crate::properties::{ComputedValues, PropertyFlags};
use crate::selector_parser::{NonTSPseudoClass, PseudoElementCascadeType, SelectorImpl};
use crate::selector_parser::{PseudoElementCascadeType, SelectorImpl};
use crate::str::{starts_with_ignore_ascii_case, string_as_ascii_lowercase};
use crate::string_cache::Atom;
use crate::values::serialize_atom_identifier;
@ -30,6 +30,7 @@ impl ::selectors::parser::PseudoElement for PseudoElement {
// ::slotted() should support all tree-abiding pseudo-elements, see
// https://drafts.csswg.org/css-scoping/#slotted-pseudo
// https://drafts.csswg.org/css-pseudo-4/#treelike
#[inline]
fn valid_after_slotted(&self) -> bool {
matches!(
*self,
@ -40,12 +41,9 @@ impl ::selectors::parser::PseudoElement for PseudoElement {
)
}
fn supports_pseudo_class(&self, pseudo_class: &NonTSPseudoClass) -> bool {
if !self.supports_user_action_state() {
return false;
}
return pseudo_class.is_safe_user_action_state();
#[inline]
fn accepts_state_pseudo_classes(&self) -> bool {
self.supports_user_action_state()
}
}