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Implement XUL tree pseudo style resolution for stylo.

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This commit is contained in:
Xidorn Quan 2017-10-20 14:08:40 +11:00
parent 915890af77
commit 2dc714f0ac
9 changed files with 172 additions and 10 deletions
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5
components/selectors/context.rs
View file

@ -109,6 +109,10 @@ where
/// The current nesting level of selectors that we're matching.
pub nesting_level: usize,
/// An optional hook function for checking whether a pseudo-element
/// should match when matching_mode is ForStatelessPseudoElement.
pub pseudo_element_matching_fn: Option<&'a Fn(&Impl::PseudoElement) -> bool>,
quirks_mode: QuirksMode,
classes_and_ids_case_sensitivity: CaseSensitivity,
_impl: ::std::marker::PhantomData<Impl>,
@ -152,6 +156,7 @@ where
classes_and_ids_case_sensitivity: quirks_mode.classes_and_ids_case_sensitivity(),
scope_element: None,
nesting_level: 0,
pseudo_element_matching_fn: None,
_impl: ::std::marker::PhantomData,
}
}

17
components/selectors/matching.rs
View file

@ -387,9 +387,20 @@ where
if context.nesting_level == 0 &&
context.matching_mode == MatchingMode::ForStatelessPseudoElement {
// Consume the pseudo.
let pseudo = iter.next().unwrap();
debug_assert!(matches!(*pseudo, Component::PseudoElement(..)),
"Used MatchingMode::ForStatelessPseudoElement in a non-pseudo selector");
match *iter.next().unwrap() {
Component::PseudoElement(ref pseudo) => {
if let Some(ref f) = context.pseudo_element_matching_fn {
if !f(pseudo) {
return false;
}
}
}
_ => {
debug_assert!(false,
"Used MatchingMode::ForStatelessPseudoElement \
in a non-pseudo selector");
}
}
// The only other parser-allowed Component in this sequence is a state
// class. We just don't match in that case.