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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
Notes: sideshowbarker 2024-07-17 18:36:47 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/7c33a084fb
5 changed files with 31 additions and 10 deletions
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2
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
View File

@ -551,6 +551,8 @@ Result<Selector::SimpleSelector, Parser::ParsingResult> Parser::parse_simple_sel
simple_selector.pseudo_class.type = Selector::SimpleSelector::PseudoClass::Type::Link;
} else if (pseudo_name.equals_ignoring_case("only-child")) {
simple_selector.pseudo_class.type = Selector::SimpleSelector::PseudoClass::Type::OnlyChild;
} else if (pseudo_name.equals_ignoring_case("only-of-type")) {
simple_selector.pseudo_class.type = Selector::SimpleSelector::PseudoClass::Type::OnlyOfType;
} else if (pseudo_name.equals_ignoring_case("root")) {
simple_selector.pseudo_class.type = Selector::SimpleSelector::PseudoClass::Type::Root;
} else if (pseudo_name.equals_ignoring_case("visited")) {

3
Userland/Libraries/LibWeb/CSS/Selector.cpp
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@ -135,6 +135,7 @@ String Selector::SimpleSelector::serialize() const
case Selector::SimpleSelector::PseudoClass::Type::Root:
case Selector::SimpleSelector::PseudoClass::Type::FirstOfType:
case Selector::SimpleSelector::PseudoClass::Type::LastOfType:
case Selector::SimpleSelector::PseudoClass::Type::OnlyOfType:
case Selector::SimpleSelector::PseudoClass::Type::Disabled:
case Selector::SimpleSelector::PseudoClass::Type::Enabled:
case Selector::SimpleSelector::PseudoClass::Type::Checked:
@ -281,6 +282,8 @@ constexpr StringView pseudo_class_name(Selector::SimpleSelector::PseudoClass::Ty
return "first-of-type"sv;
case Selector::SimpleSelector::PseudoClass::Type::LastOfType:
return "last-of-type"sv;
case Selector::SimpleSelector::PseudoClass::Type::OnlyOfType:
return "only-of-type"sv;
case Selector::SimpleSelector::PseudoClass::Type::Disabled:
return "disabled"sv;
case Selector::SimpleSelector::PseudoClass::Type::Enabled:

1
Userland/Libraries/LibWeb/CSS/Selector.h
View File

@ -57,6 +57,7 @@ public:
Root,
FirstOfType,
LastOfType,
OnlyOfType,
NthChild,
NthLastChild,
Disabled,

32
Userland/Libraries/LibWeb/CSS/SelectorEngine.cpp
View File

@ -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;

3
Userland/Libraries/LibWeb/Dump.cpp
View File

@ -382,6 +382,9 @@ void dump_selector(StringBuilder& builder, CSS::Selector const& selector)
case CSS::Selector::SimpleSelector::PseudoClass::Type::LastOfType:
pseudo_class_description = "LastOfType";
break;
case CSS::Selector::SimpleSelector::PseudoClass::Type::OnlyOfType:
pseudo_class_description = "OnlyOfType";
break;
case CSS::Selector::SimpleSelector::PseudoClass::Type::NthChild:
pseudo_class_description = "NthChild";
break;