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style: Simplify a bit hot selector-matching loop

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Note that element.clone() is just copying a couple pointers.

Have a single place where we compute the next element and check for linky-ness.
This saves a couple checks (very very minor win in the micro-benchmark I've
been looking at, but consistent).

Depends on D145484

Differential Revision: https://phabricator.services.mozilla.com/D145485
This commit is contained in:
Emilio Cobos Álvarez 2022-05-06 23:52:23 +00:00 • committed by Martin Robinson
parent a21762fc5b
commit 2939bf1a12
1 changed files with 7 additions and 11 deletions
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18
components/selectors/matching.rs
View file

@ -490,19 +490,21 @@ where
Combinator::PseudoElement => SelectorMatchingResult::NotMatchedGlobally,
};
let mut next_element =
next_element_for_combinator(element, combinator, &selector_iter, &context);
// Stop matching :visited as soon as we find a link, or a combinator for
// something that isn't an ancestor.
let mut visited_handling = if element.is_link() || combinator.is_sibling() {
let mut visited_handling = if combinator.is_sibling() {
VisitedHandlingMode::AllLinksUnvisited
} else {
context.visited_handling()
};
let mut element = element.clone();
loop {
let element = match next_element {
if element.is_link() {
visited_handling = VisitedHandlingMode::AllLinksUnvisited;
}
element = match next_element_for_combinator(&element, combinator, &selector_iter, &context) {
None => return candidate_not_found,
Some(next_element) => next_element,
};
@ -549,12 +551,6 @@ where
// matching on the next candidate element.
_ => {},
}
if element.is_link() {
visited_handling = VisitedHandlingMode::AllLinksUnvisited;
}
next_element = next_element_for_combinator(&element, combinator, &selector_iter, &context);
}
}