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Implement use<> formatting in rustfmt

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This commit is contained in:
Michael Goulet 2024-06-20 13:42:37 -04:00
parent 081ae53225
commit 10277c97c2
5 changed files with 105 additions and 9 deletions
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15
src/overflow.rs
View File

@ -83,6 +83,7 @@ pub(crate) enum OverflowableItem<'a> {
TuplePatField(&'a TuplePatField<'a>),
Ty(&'a ast::Ty),
Pat(&'a ast::Pat),
PreciseCapturingArg(&'a ast::PreciseCapturingArg),
}
impl<'a> Rewrite for OverflowableItem<'a> {
@ -123,6 +124,7 @@ pub(crate) fn map<F, T>(&self, f: F) -> T
OverflowableItem::TuplePatField(pat) => f(*pat),
OverflowableItem::Ty(ty) => f(*ty),
OverflowableItem::Pat(pat) => f(*pat),
OverflowableItem::PreciseCapturingArg(arg) => f(*arg),
}
}
@ -137,6 +139,9 @@ pub(crate) fn is_simple(&self) -> bool {
matches!(meta_item.kind, ast::MetaItemKind::Word)
}
},
// FIXME: Why don't we consider `SegmentParam` to be simple?
// FIXME: If we also fix `SegmentParam`, then we should apply the same
// heuristic to `PreciseCapturingArg`.
_ => false,
}
}
@ -244,7 +249,15 @@ fn into_overflowable_item(&'a self) -> OverflowableItem<'a> {
}
}
impl_into_overflowable_item_for_ast_node!(Expr, GenericParam, NestedMetaItem, FieldDef, Ty, Pat);
impl_into_overflowable_item_for_ast_node!(
Expr,
GenericParam,
NestedMetaItem,
FieldDef,
Ty,
Pat,
PreciseCapturingArg
);
impl_into_overflowable_item_for_rustfmt_types!([MacroArg], [SegmentParam, TuplePatField]);
pub(crate) fn into_overflowable_list<'a, T>(

9
src/spanned.rs
View File

@ -203,3 +203,12 @@ fn span(&self) -> Span {
self.span()
}
}
impl Spanned for ast::PreciseCapturingArg {
fn span(&self) -> Span {
match self {
ast::PreciseCapturingArg::Lifetime(lt) => lt.ident.span,
ast::PreciseCapturingArg::Arg(path, _) => path.span,
}
}
}

26
src/types.rs
View File

@ -177,6 +177,17 @@ fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String>
}
}
impl Rewrite for ast::PreciseCapturingArg {
fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
match self {
ast::PreciseCapturingArg::Lifetime(lt) => lt.rewrite(context, shape),
ast::PreciseCapturingArg::Arg(p, _) => {
rewrite_path(context, PathContext::Type, &None, p, shape)
}
}
}
}
impl Rewrite for ast::AssocItemConstraint {
fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String> {
use ast::AssocItemConstraintKind::{Bound, Equality};
@ -564,9 +575,10 @@ fn rewrite(&self, context: &RewriteContext<'_>, shape: Shape) -> Option<String>
.map(|s| format!("{constness}{asyncness}{polarity}{s}"))
.map(|s| if has_paren { format!("({})", s) } else { s })
}
ast::GenericBound::Use(ref args, span) => {
overflow::rewrite_with_angle_brackets(context, "use", args.iter(), shape, span)
}
ast::GenericBound::Outlives(ref lifetime) => lifetime.rewrite(context, shape),
// FIXME(precise_capturing): Should implement formatting before stabilization.
ast::GenericBound::Use(..) => None,
}
}
}
@ -933,9 +945,7 @@ fn rewrite_bare_fn(
fn is_generic_bounds_in_order(generic_bounds: &[ast::GenericBound]) -> bool {
let is_trait = |b: &ast::GenericBound| match b {
ast::GenericBound::Outlives(..) => false,
ast::GenericBound::Trait(..) => true,
// FIXME(precise_capturing): This ordering fn should be reworked.
ast::GenericBound::Use(..) => false,
ast::GenericBound::Trait(..) | ast::GenericBound::Use(..) => true,
};
let is_lifetime = |b: &ast::GenericBound| !is_trait(b);
let last_trait_index = generic_bounds.iter().rposition(is_trait);
@ -969,9 +979,8 @@ fn join_bounds_inner(
let generic_bounds_in_order = is_generic_bounds_in_order(items);
let is_bound_extendable = |s: &str, b: &ast::GenericBound| match b {
ast::GenericBound::Outlives(..) => true,
ast::GenericBound::Trait(..) => last_line_extendable(s),
// FIXME(precise_capturing): This ordering fn should be reworked.
ast::GenericBound::Use(..) => true,
// We treat `use<>` like a trait bound here.
ast::GenericBound::Trait(..) | ast::GenericBound::Use(..) => last_line_extendable(s),
};
// Whether a GenericBound item is a PathSegment segment that includes internal array
@ -993,6 +1002,7 @@ fn join_bounds_inner(
}
}
}
ast::GenericBound::Use(args, _) => args.len() > 1,
_ => false,
};

9
tests/source/precise-capturing.rs Normal file
View File

@ -0,0 +1,9 @@
fn hello() -> impl
use<'a> + Sized {}
fn all_three() -> impl Sized + use<'a> + 'a;
fn pathological() -> impl use<'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a,
'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a,
'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a,
'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a, 'a> + Sized {}

55
tests/target/precise-capturing.rs Normal file
View File

@ -0,0 +1,55 @@
fn hello() -> impl use<'a> + Sized {}
fn all_three() -> impl Sized + use<'a> + 'a;
fn pathological() -> impl use<
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
'a,
> + Sized {
}