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LibWeb: Implement :nth-last-child pseudo-class

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miere43 2021-05-11 17:13:57 +03:00 • committed by Linus Groh
parent e87eaa3991
commit c4bd4cbd76
4 changed files with 15 additions and 3 deletions
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9
Userland/Libraries/LibWeb/CSS/SelectorEngine.cpp
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@ -83,6 +83,7 @@ static bool matches(const CSS::Selector::SimpleSelector& component, const DOM::E
}
break;
case CSS::Selector::SimpleSelector::PseudoClass::NthChild:
case CSS::Selector::SimpleSelector::PseudoClass::NthLastChild:
const auto step_size = component.nth_child_pattern.step_size;
const auto offset = component.nth_child_pattern.offset;
if (step_size == 0 && offset == 0)
@ -93,8 +94,12 @@ static bool matches(const CSS::Selector::SimpleSelector& component, const DOM::E
return false;
int index = 1;
for (auto* child = parent->first_child_of_type<DOM::Element>(); child && child != &element; child = child->next_element_sibling()) {
++index;
if (component.pseudo_class == CSS::Selector::SimpleSelector::PseudoClass::NthChild) {
for (auto* child = parent->first_child_of_type<DOM::Element>(); child && child != &element; child = child->next_element_sibling())
++index;
} else {
for (auto* child = parent->last_child_of_type<DOM::Element>(); child && child != &element; child = child->previous_element_sibling())
++index;
}
if (step_size < 0) {