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style: Represent FirstChild, FirstOfType, LastChild, LastOfType, OnlyChild, and OnlyOfType as functionless Nth variants

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Like bug 1808226, this doesn't change any behavior, it just simplifies matching.

I also added a WPT JavaScript test for :only-of-type, since dedicated WPT
JavScript tests already exist for the other pseudo-classes this patch
touches.

Differential Revision: https://phabricator.services.mozilla.com/D165859
This commit is contained in:
Zach Hoffman 2023-01-03 15:30:19 +00:00 • committed by Martin Robinson
parent dc225e0b2f
commit 211761ad88
5 changed files with 76 additions and 74 deletions
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59
components/selectors/parser.rs
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@ -1042,8 +1042,10 @@ impl Combinator {
pub enum NthType {
Child,
LastChild,
OnlyChild,
OfType,
LastOfType,
OnlyOfType,
}
/// The properties that comprise an :nth- pseudoclass as of Selectors 3 (e.g.,
@ -1053,6 +1055,7 @@ pub enum NthType {
#[shmem(no_bounds)]
pub struct NthSelectorData {
pub ty: NthType,
pub is_function: bool,
pub a: i32,
pub b: i32,
}
@ -1099,16 +1102,10 @@ pub enum Component<Impl: SelectorImpl> {
/// Pseudo-classes
Negation(Box<[Selector<Impl>]>),
FirstChild,
LastChild,
OnlyChild,
Root,
Empty,
Scope,
Nth(NthSelectorData),
FirstOfType,
LastOfType,
OnlyOfType,
NonTSPseudoClass(#[cfg_attr(feature = "shmem", shmem(field_bound))] Impl::NonTSPseudoClass),
/// The ::slotted() pseudo-element:
///
@ -1598,9 +1595,6 @@ impl<Impl: SelectorImpl> ToCss for Component<Impl> {
AttributeOther(ref attr_selector) => attr_selector.to_css(dest),
// Pseudo-classes
FirstChild => dest.write_str(":first-child"),
LastChild => dest.write_str(":last-child"),
OnlyChild => dest.write_str(":only-child"),
Root => dest.write_str(":root"),
Empty => dest.write_str(":empty"),
Scope => dest.write_str(":scope"),
@ -1613,17 +1607,27 @@ impl<Impl: SelectorImpl> ToCss for Component<Impl> {
}
Ok(())
},
FirstOfType => dest.write_str(":first-of-type"),
LastOfType => dest.write_str(":last-of-type"),
OnlyOfType => dest.write_str(":only-of-type"),
Nth(nth_data) => {
match nth_data.ty {
NthType::Child => dest.write_str(":nth-child(")?,
NthType::LastChild => dest.write_str(":nth-last-child(")?,
NthType::OfType => dest.write_str(":nth-of-type(")?,
NthType::LastOfType => dest.write_str(":nth-last-of-type(")?,
if nth_data.is_function {
match nth_data.ty {
NthType::Child => dest.write_str(":nth-child("),
NthType::LastChild => dest.write_str(":nth-last-child("),
NthType::OfType => dest.write_str(":nth-of-type("),
NthType::LastOfType => dest.write_str(":nth-last-of-type("),
_ => unreachable!(),
}?;
write_affine(dest, nth_data.a, nth_data.b)?;
} else {
match nth_data.ty {
NthType::Child => dest.write_str(":first-child"),
NthType::LastChild => dest.write_str(":last-child"),
NthType::OnlyChild => dest.write_str(":only-child"),
NthType::OfType => dest.write_str(":first-of-type"),
NthType::LastOfType => dest.write_str(":last-of-type"),
NthType::OnlyOfType => dest.write_str(":only-of-type"),
}?;
}
write_affine(dest, nth_data.a, nth_data.b)?;
dest.write_char(')')
},
Is(ref list) | Where(ref list) | Negation(ref list) | Has(ref list) => {
@ -2373,7 +2377,12 @@ where
return Err(input.new_custom_error(SelectorParseErrorKind::InvalidState));
}
let (a, b) = parse_nth(input)?;
Ok(Component::Nth(NthSelectorData { ty, a, b }))
Ok(Component::Nth(NthSelectorData {
ty,
is_function: true,
a,
b,
}))
}
/// Returns whether the name corresponds to a CSS2 pseudo-element that
@ -2534,16 +2543,16 @@ where
if state.allows_tree_structural_pseudo_classes() {
match_ignore_ascii_case! { &name,
"first-child" => return Ok(Component::FirstChild),
"last-child" => return Ok(Component::LastChild),
"only-child" => return Ok(Component::OnlyChild),
"first-child" => return Ok(Component::Nth(NthSelectorData{ ty: NthType:: Child, is_function: false, a: 0, b: 1})),
"last-child" => return Ok(Component::Nth(NthSelectorData{ ty: NthType:: LastChild, is_function: false, a: 0, b: 1})),
"only-child" => return Ok(Component::Nth(NthSelectorData{ ty: NthType:: OnlyChild, is_function: false, a: 0, b: 1})),
"root" => return Ok(Component::Root),
"empty" => return Ok(Component::Empty),
"scope" => return Ok(Component::Scope),
"host" if P::parse_host(parser) => return Ok(Component::Host(None)),
"first-of-type" => return Ok(Component::FirstOfType),
"last-of-type" => return Ok(Component::LastOfType),
"only-of-type" => return Ok(Component::OnlyOfType),
"first-of-type" => return Ok(Component::Nth(NthSelectorData{ ty: NthType:: OfType, is_function: false, a: 0, b: 1})),
"last-of-type" => return Ok(Component::Nth(NthSelectorData{ ty: NthType:: LastOfType, is_function: false, a: 0, b: 1})),
"only-of-type" => return Ok(Component::Nth(NthSelectorData{ ty: NthType:: OnlyOfType, is_function: false, a: 0, b: 1})),
_ => {},
}
}