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optimize common case of previously seen simple selectors

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This commit is contained in:
Connor Skees 2020-07-04 12:11:01 -04:00
parent 87b18e321f
commit ca861d488b
1 changed files with 11 additions and 4 deletions
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7
src/selector/extend/mod.rs
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@ -912,10 +912,17 @@ impl Extender {
for component in complex.components {
if let ComplexSelectorComponent::Compound(component) = component {
for simple in component.components {
// PERF: we compute the hash twice, which isn't great, but we avoid a superfluous
// clone in cases where we have already seen a simple selector (common in
// scenarios in which there is a lot of nesting)
if let Some(entry) = self.selectors.get_mut(&simple) {
entry.insert(selector.clone())
} else {
self.selectors
.entry(simple.clone())
.or_insert_with(SelectorHashSet::new)
.insert(selector.clone());
}
if let SimpleSelector::Pseudo(Pseudo {
selector: Some(simple_selector),