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style: Implement selector matching for :nth-child(An+B of selector list) and :nth-last-child(An+B of selector list)

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Since we have been using a single hash map to cache all :nth-child
indices (with no selector list), each different selector will need its
own cache.

As a side note, this patch does not address invalidation.

Differential Revision: https://phabricator.services.mozilla.com/D166266
This commit is contained in:
Zach Hoffman 2023-01-16 11:26:41 +00:00 • committed by Martin Robinson
parent a973371cf2
commit 3076481c52
8 changed files with 223 additions and 71 deletions
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9
components/style/stylist.rs
View file

@ -1125,6 +1125,7 @@ impl Stylist {
{
debug_assert!(pseudo.is_lazy());
let mut nth_index_cache = Default::default();
// No need to bother setting the selector flags when we're computing
// default styles.
let needs_selector_flags = if rule_inclusion == RuleInclusion::DefaultOnly {
@ -1137,7 +1138,7 @@ impl Stylist {
let mut matching_context = MatchingContext::<'_, E::Impl>::new(
MatchingMode::ForStatelessPseudoElement,
None,
None,
&mut nth_index_cache,
self.quirks_mode,
needs_selector_flags,
);
@ -1166,10 +1167,12 @@ impl Stylist {
let mut visited_rules = None;
if parent_style.visited_style().is_some() {
let mut declarations = ApplicableDeclarationList::new();
let mut nth_index_cache = Default::default();
let mut matching_context = MatchingContext::<'_, E::Impl>::new_for_visited(
MatchingMode::ForStatelessPseudoElement,
None,
None,
&mut nth_index_cache,
VisitedHandlingMode::RelevantLinkVisited,
self.quirks_mode,
needs_selector_flags,
@ -1417,7 +1420,7 @@ impl Stylist {
let mut matching_context = MatchingContext::new(
MatchingMode::Normal,
bloom,
Some(nth_index_cache),
nth_index_cache,
self.quirks_mode,
needs_selector_flags,
);