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style: Store values for :nth- selectors in dedicated struct NthSelectorData

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To accomplish this, all :nth- Components were replaced with type Nth,
which uses NthSelectorData.

Using NthSelectorData will make it easier to add selector lists for :nth
selectors later on, but this change by itself shouldn't change any
behavior.

Differential Revision: https://phabricator.services.mozilla.com/D165831
This commit is contained in:
Zach Hoffman 2023-01-03 08:35:20 +00:00 • committed by Martin Robinson
parent b373d9c1c4
commit 281ae0748f
5 changed files with 49 additions and 49 deletions
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56
components/selectors/parser.rs
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@ -1036,6 +1036,27 @@ impl Combinator {
}
}
/// An enum for the different types of :nth- pseudoclasses
#[derive(Copy, Clone, Eq, PartialEq, ToShmem)]
#[shmem(no_bounds)]
pub enum NthType {
Child,
LastChild,
OfType,
LastOfType,
}
/// The properties that comprise an :nth- pseudoclass as of Selectors 3 (e.g.,
/// nth-child(An+B)).
/// https://www.w3.org/TR/selectors-3/#nth-child-pseudo
#[derive(Copy, Clone, Eq, PartialEq, ToShmem)]
#[shmem(no_bounds)]
pub struct NthSelectorData {
pub ty: NthType,
pub a: i32,
pub b: i32,
}
/// A CSS simple selector or combinator. We store both in the same enum for
/// optimal packing and cache performance, see [1].
///
@ -1084,10 +1105,7 @@ pub enum Component<Impl: SelectorImpl> {
Root,
Empty,
Scope,
NthChild(i32, i32),
NthLastChild(i32, i32),
NthOfType(i32, i32),
NthLastOfType(i32, i32),
Nth(NthSelectorData),
FirstOfType,
LastOfType,
OnlyOfType,
@ -1598,15 +1616,14 @@ impl<Impl: SelectorImpl> ToCss for Component<Impl> {
FirstOfType => dest.write_str(":first-of-type"),
LastOfType => dest.write_str(":last-of-type"),
OnlyOfType => dest.write_str(":only-of-type"),
NthChild(a, b) | NthLastChild(a, b) | NthOfType(a, b) | NthLastOfType(a, b) => {
match *self {
NthChild(_, _) => dest.write_str(":nth-child(")?,
NthLastChild(_, _) => dest.write_str(":nth-last-child(")?,
NthOfType(_, _) => dest.write_str(":nth-of-type(")?,
NthLastOfType(_, _) => dest.write_str(":nth-last-of-type(")?,
_ => unreachable!(),
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(")?,
}
write_affine(dest, a, b)?;
write_affine(dest, nth_data.a, nth_data.b)?;
dest.write_char(')')
},
Is(ref list) | Where(ref list) | Negation(ref list) | Has(ref list) => {
@ -2312,10 +2329,10 @@ where
Impl: SelectorImpl,
{
match_ignore_ascii_case! { &name,
"nth-child" => return parse_nth_pseudo_class(parser, input, state, Component::NthChild),
"nth-of-type" => return parse_nth_pseudo_class(parser, input, state, Component::NthOfType),
"nth-last-child" => return parse_nth_pseudo_class(parser, input, state, Component::NthLastChild),
"nth-last-of-type" => return parse_nth_pseudo_class(parser, input, state, Component::NthLastOfType),
"nth-child" => return parse_nth_pseudo_class(parser, input, state, NthType::Child),
"nth-of-type" => return parse_nth_pseudo_class(parser, input, state, NthType::OfType),
"nth-last-child" => return parse_nth_pseudo_class(parser, input, state, NthType::LastChild),
"nth-last-of-type" => return parse_nth_pseudo_class(parser, input, state, NthType::LastOfType),
"is" if parser.parse_is_and_where() => return parse_is_where_has(parser, input, state, Component::Is),
"where" if parser.parse_is_and_where() => return parse_is_where_has(parser, input, state, Component::Where),
"has" if parser.parse_has() => return parse_is_where_has(parser, input, state, Component::Has),
@ -2342,22 +2359,21 @@ where
P::parse_non_ts_functional_pseudo_class(parser, name, input).map(Component::NonTSPseudoClass)
}
fn parse_nth_pseudo_class<'i, 't, P, Impl, F>(
fn parse_nth_pseudo_class<'i, 't, P, Impl>(
_: &P,
input: &mut CssParser<'i, 't>,
state: SelectorParsingState,
selector: F,
ty: NthType,
) -> Result<Component<Impl>, ParseError<'i, P::Error>>
where
P: Parser<'i, Impl = Impl>,
Impl: SelectorImpl,
F: FnOnce(i32, i32) -> Component<Impl>,
{
if !state.allows_tree_structural_pseudo_classes() {
return Err(input.new_custom_error(SelectorParseErrorKind::InvalidState));
}
let (a, b) = parse_nth(input)?;
Ok(selector(a, b))
Ok(Component::Nth(NthSelectorData { ty, a, b }))
}
/// Returns whether the name corresponds to a CSS2 pseudo-element that