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LibWeb: Make CSS 'An+B' parsing spec-compliant
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.
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@ -112,7 +112,7 @@ public:
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template<typename T>
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Vector<Vector<StyleComponentValueRule>> parse_as_comma_separated_list_of_component_values(TokenStream<T>&);
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Optional<Selector::SimpleSelector::NthChildPattern> parse_nth_child_pattern(TokenStream<StyleComponentValueRule>&);
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Optional<Selector::SimpleSelector::ANPlusBPattern> parse_a_n_plus_b_pattern(TokenStream<StyleComponentValueRule>&);
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// FIXME: https://www.w3.org/TR/selectors-4/
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// Contrary to the name, these parse a comma-separated list of selectors, according to the spec.
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