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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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13
Userland/Libraries/LibWeb/Dump.cpp
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@ -447,8 +447,17 @@ void dump_selector(StringBuilder& builder, CSS::Selector const& selector)
dump_selector(builder, selector);
builder.append("])");
} else if ((pseudo_class.type == CSS::Selector::SimpleSelector::PseudoClass::Type::NthChild)
|| (pseudo_class.type == CSS::Selector::SimpleSelector::PseudoClass::Type::NthLastChild)) {
builder.appendff("(step={}, offset={})", pseudo_class.nth_child_pattern.step_size, pseudo_class.nth_child_pattern.offset);
|| (pseudo_class.type == CSS::Selector::SimpleSelector::PseudoClass::Type::NthLastChild)
|| (pseudo_class.type == CSS::Selector::SimpleSelector::PseudoClass::Type::NthOfType)
|| (pseudo_class.type == CSS::Selector::SimpleSelector::PseudoClass::Type::NthLastOfType)) {
builder.appendff("(step={}, offset={}", pseudo_class.nth_child_pattern.step_size, pseudo_class.nth_child_pattern.offset);
if (!pseudo_class.argument_selector_list.is_empty()) {
builder.append(", selectors=[");
for (auto const& child_selector : pseudo_class.argument_selector_list)
dump_selector(builder, child_selector);
builder.append("]");
}
builder.append(")");
}
}