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https://github.com/RGBCube/serenity
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LibWeb: Implement :nth-last-child pseudo-class
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e87eaa3991
commit
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4 changed files with 15 additions and 3 deletions
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@ -566,6 +566,9 @@ public:
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} else if (pseudo_name.starts_with("nth-child", CaseSensitivity::CaseInsensitive)) {
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simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::NthChild;
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simple_selector.nth_child_pattern = CSS::Selector::SimpleSelector::NthChildPattern::parse(capture_selector_args(pseudo_name));
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} else if (pseudo_name.starts_with("nth-last-child", CaseSensitivity::CaseInsensitive)) {
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simple_selector.pseudo_class = CSS::Selector::SimpleSelector::PseudoClass::NthLastChild;
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simple_selector.nth_child_pattern = CSS::Selector::SimpleSelector::NthChildPattern::parse(capture_selector_args(pseudo_name));
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} else if (pseudo_name.equals_ignoring_case("before")) {
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simple_selector.pseudo_element = CSS::Selector::SimpleSelector::PseudoElement::Before;
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} else if (pseudo_name.equals_ignoring_case("after")) {
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@ -37,6 +37,7 @@ public:
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FirstOfType,
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LastOfType,
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NthChild,
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NthLastChild,
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};
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PseudoClass pseudo_class { PseudoClass::None };
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@ -69,7 +70,7 @@ public:
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};
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// FIXME: We don't need this field on every single SimpleSelector, but it's also annoying to malloc it somewhere.
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// Only used when "pseudo_class" == PseudoClass::NthChild.
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// Only used when "pseudo_class" is "NthChild" or "NthLastChild".
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NthChildPattern nth_child_pattern;
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};
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@ -83,6 +83,7 @@ static bool matches(const CSS::Selector::SimpleSelector& component, const DOM::E
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}
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break;
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case CSS::Selector::SimpleSelector::PseudoClass::NthChild:
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case CSS::Selector::SimpleSelector::PseudoClass::NthLastChild:
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const auto step_size = component.nth_child_pattern.step_size;
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const auto offset = component.nth_child_pattern.offset;
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if (step_size == 0 && offset == 0)
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@ -93,8 +94,12 @@ static bool matches(const CSS::Selector::SimpleSelector& component, const DOM::E
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return false;
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int index = 1;
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for (auto* child = parent->first_child_of_type<DOM::Element>(); child && child != &element; child = child->next_element_sibling()) {
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++index;
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if (component.pseudo_class == CSS::Selector::SimpleSelector::PseudoClass::NthChild) {
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for (auto* child = parent->first_child_of_type<DOM::Element>(); child && child != &element; child = child->next_element_sibling())
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++index;
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} else {
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for (auto* child = parent->last_child_of_type<DOM::Element>(); child && child != &element; child = child->previous_element_sibling())
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++index;
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}
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if (step_size < 0) {
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@ -354,6 +354,9 @@ void dump_selector(StringBuilder& builder, const CSS::Selector& selector)
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case CSS::Selector::SimpleSelector::PseudoClass::NthChild:
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pseudo_class_description = "NthChild";
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break;
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case CSS::Selector::SimpleSelector::PseudoClass::NthLastChild:
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pseudo_class_description = "NthLastChild";
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break;
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case CSS::Selector::SimpleSelector::PseudoClass::Focus:
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pseudo_class_description = "Focus";
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break;
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