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LibWeb: Implement functional pseudo-element parsing

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"Functional" as in "it's a function token" and not "it works", because
the behaviour for these is unimplemented. :^)

This is modeled after the pseudo-class parsing, but with some changes
based on things I don't like about that implementation. I've
implemented the `<pt-name-selector>` parameter used by view-transitions
for now, but nothing else.
This commit is contained in:
Sam Atkins 2025-03-24 13:56:24 +00:00 • committed by Andreas Kling
commit 88e11eea2d
Notes: github-actions[bot] 2025-03-25 07:56:12 +00:00
8 changed files with 237 additions and 43 deletions
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24
Libraries/LibWeb/CSS/Selector.h
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@ -25,15 +25,24 @@ class Selector : public RefCounted<Selector> {
public:
class PseudoElementSelector {
public:
explicit PseudoElementSelector(PseudoElement type)
struct PTNameSelector {
bool is_universal { false };
FlyString value {};
};
using Value = Variant<Empty, PTNameSelector>;
explicit PseudoElementSelector(PseudoElement type, Value value = {})
: m_type(type)
, m_value(move(value))
{
VERIFY(is_known_pseudo_element_type(type));
}
PseudoElementSelector(PseudoElement type, String name)
PseudoElementSelector(PseudoElement type, String name, Value value = {})
: m_type(type)
, m_name(move(name))
, m_value(move(value))
{
}
@ -44,19 +53,16 @@ public:
return to_underlying(type) < to_underlying(PseudoElement::KnownPseudoElementCount);
}
StringView name() const
{
if (!m_name.is_empty())
return m_name;
return pseudo_element_name(m_type);
}
String serialize() const;
PseudoElement type() const { return m_type; }
PTNameSelector const& pt_name_selector() const { return m_value.get<PTNameSelector>(); }
private:
PseudoElement m_type;
String m_name;
Variant<Empty, PTNameSelector> m_value;
};
struct SimpleSelector {