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LibWeb: Support CSS :only-of-type selector

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This matches any element that doesn't have a sibling with the same tag
name as itself.
This commit is contained in:
Andreas Kling 2022-02-17 22:43:22 +01:00
parent b9b24cb1c1
commit 7c33a084fb
5 changed files with 31 additions and 10 deletions
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32
Userland/Libraries/LibWeb/CSS/SelectorEngine.cpp
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@ -53,6 +53,24 @@ static inline bool matches_attribute(CSS::Selector::SimpleSelector::Attribute co
return false;
}
static inline DOM::Element const* previous_sibling_with_same_tag_name(DOM::Element const& element)
{
for (auto const* sibling = element.previous_element_sibling(); sibling; sibling = sibling->previous_element_sibling()) {
if (sibling->tag_name() == element.tag_name())
return sibling;
}
return nullptr;
}
static inline DOM::Element const* next_sibling_with_same_tag_name(DOM::Element const& element)
{
for (auto const* sibling = element.next_element_sibling(); sibling; sibling = sibling->next_element_sibling()) {
if (sibling->tag_name() == element.tag_name())
return sibling;
}
return nullptr;
}
static inline bool matches_pseudo_class(CSS::Selector::SimpleSelector::PseudoClass const& pseudo_class, DOM::Element const& element)
{
switch (pseudo_class.type) {
@ -80,17 +98,11 @@ static inline bool matches_pseudo_class(CSS::Selector::SimpleSelector::PseudoCla
case CSS::Selector::SimpleSelector::PseudoClass::Type::Root:
return is<HTML::HTMLHtmlElement>(element);
case CSS::Selector::SimpleSelector::PseudoClass::Type::FirstOfType:
for (auto* sibling = element.previous_element_sibling(); sibling; sibling = sibling->previous_element_sibling()) {
if (sibling->tag_name() == element.tag_name())
return false;
}
return true;
return !previous_sibling_with_same_tag_name(element);
case CSS::Selector::SimpleSelector::PseudoClass::Type::LastOfType:
for (auto* sibling = element.next_element_sibling(); sibling; sibling = sibling->next_element_sibling()) {
if (sibling->tag_name() == element.tag_name())
return false;
}
return true;
return !next_sibling_with_same_tag_name(element);
case CSS::Selector::SimpleSelector::PseudoClass::Type::OnlyOfType:
return !previous_sibling_with_same_tag_name(element) && !next_sibling_with_same_tag_name(element);
case CSS::Selector::SimpleSelector::PseudoClass::Type::Disabled:
if (!element.tag_name().equals_ignoring_case(HTML::TagNames::input))
return false;