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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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4
Userland/Libraries/LibWeb/CSS/Parser/DeprecatedCSSParser.cpp
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@ -1046,10 +1046,10 @@ public:
pseudo_class.type = CSS::Selector::SimpleSelector::PseudoClass::Type::LastOfType;
} else if (pseudo_name.starts_with("nth-child", CaseSensitivity::CaseInsensitive)) {
pseudo_class.type = CSS::Selector::SimpleSelector::PseudoClass::Type::NthChild;
pseudo_class.nth_child_pattern = CSS::Selector::SimpleSelector::NthChildPattern::parse(capture_selector_args(pseudo_name));
pseudo_class.nth_child_pattern = CSS::Selector::SimpleSelector::ANPlusBPattern::parse(capture_selector_args(pseudo_name));
} else if (pseudo_name.starts_with("nth-last-child", CaseSensitivity::CaseInsensitive)) {
pseudo_class.type = CSS::Selector::SimpleSelector::PseudoClass::Type::NthLastChild;
pseudo_class.nth_child_pattern = CSS::Selector::SimpleSelector::NthChildPattern::parse(capture_selector_args(pseudo_name));
pseudo_class.nth_child_pattern = CSS::Selector::SimpleSelector::ANPlusBPattern::parse(capture_selector_args(pseudo_name));
} else if (pseudo_name.equals_ignoring_case("before")) {
simple_selector.pseudo_element = CSS::Selector::SimpleSelector::PseudoElement::Before;
} else if (pseudo_name.equals_ignoring_case("after")) {