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LibWeb: Make CSS 'An+B' parsing spec-compliant

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Parsing this pattern from CSS tokens turns out to be slightly crazy, but
thankfully well documented in the spec.

The spec lists the cases in order of simple -> complicated, but this
would cause problems in code, since `<n-dimension> <signed-.integer>`
would never by reached, as `<n-dimension>` comes before. Instead, I
have grouped them by their first token.

Also renamed the NthChildPattern class to ANPlusBPattern, to match spec
terminology.
This commit is contained in:
Sam Atkins 2021-07-24 21:22:44 +01:00 • committed by Andreas Kling
parent 8d0ff98eff
commit 6034fc0ee6
7 changed files with 333 additions and 92 deletions
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2
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -112,7 +112,7 @@ public:
template<typename T>
Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values(TokenStream<T>&);
Optional<Selector::SimpleSelector::NthChildPattern> parse_nth_child_pattern(TokenStream<StyleComponentValueRule>&);
Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
// FIXME: https://www.w3.org/TR/selectors-4/
// Contrary to the name, these parse a comma-separated list of selectors, according to the spec.