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LibWeb: Implement :nth-[last-]child(n of foo) syntax

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In Selectors level 4, `:nth-child()` and `:nth-last-child()` can both
optionally take a selector-list argument. This selector-list acts as a
filter, so that only elements matching the list are counted. For
example, this means that the following are equivalent:

```css
:nth-child(2n+1 of p) {}
p:nth-of-type(2n+1) {}
```
This commit is contained in:
Sam Atkins 2022-03-17 19:13:51 +00:00 • committed by Andreas Kling
parent 0e4c35b4b2
commit 5b0187477b
5 changed files with 92 additions and 25 deletions
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6
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -157,7 +157,11 @@ private:
template<typename T>
RefPtr<Supports> parse_a_supports(TokenStream<T>&);
Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
enum class AllowTrailingTokens {
No,
Yes
};
Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&, AllowTrailingTokens = AllowTrailingTokens::No);
template<typename T>
[[nodiscard]] NonnullRefPtrVector<StyleRule> consume_a_list_of_rules(TokenStream<T>&, bool top_level);