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Merge pull request #2284 from topecongiro/trait-aliases
Format trait aliases
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commit
8db33ff0f7
16
src/items.rs
16
src/items.rs
@ -1087,6 +1087,22 @@ pub fn format_trait(context: &RewriteContext, item: &ast::Item, offset: Indent)
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}
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}
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pub fn format_trait_alias(
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context: &RewriteContext,
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ident: ast::Ident,
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generics: &ast::Generics,
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ty_param_bounds: &ast::TyParamBounds,
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shape: Shape,
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) -> Option<String> {
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let alias = ident.name.as_str();
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// 6 = "trait ", 2 = " ="
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let g_shape = shape.offset_left(6 + alias.len())?.sub_width(2)?;
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let generics_str = rewrite_generics(context, generics, g_shape, generics.span)?;
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let lhs = format!("trait {}{} =", alias, generics_str);
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// 1 = ";"
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rewrite_assign_rhs(context, lhs, ty_param_bounds, shape.sub_width(1)?).map(|s| s + ";")
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}
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fn format_unit_struct(context: &RewriteContext, p: &StructParts, offset: Indent) -> Option<String> {
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let header_str = format_header(p.prefix, p.ident, p.vis);
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let generics_str = if let Some(generics) = p.generics {
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@ -22,8 +22,8 @@ use comment::{combine_strs_with_missing_comments, contains_comment, remove_trail
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CodeCharKind, CommentCodeSlices, FindUncommented};
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use comment::rewrite_comment;
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use config::{BraceStyle, Config};
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use items::{format_impl, format_trait, rewrite_associated_impl_type, rewrite_associated_type,
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rewrite_type_alias, FnSig, StaticParts, StructParts};
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use items::{format_impl, format_trait, format_trait_alias, rewrite_associated_impl_type,
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rewrite_associated_type, rewrite_type_alias, FnSig, StaticParts, StructParts};
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use lists::{itemize_list, write_list, DefinitiveListTactic, ListFormatting, SeparatorPlace,
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SeparatorTactic};
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use macros::{rewrite_macro, MacroPosition};
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@ -373,9 +373,16 @@ impl<'b, 'a: 'b> FmtVisitor<'a> {
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let rw = format_trait(&self.get_context(), item, self.block_indent);
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self.push_rewrite(item.span, rw);
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}
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ast::ItemKind::TraitAlias(..) => {
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// FIXME: #2283.
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self.push_rewrite(item.span, None);
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ast::ItemKind::TraitAlias(ref generics, ref ty_param_bounds) => {
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let shape = Shape::indented(self.block_indent, self.config);
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let rw = format_trait_alias(
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&self.get_context(),
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item.ident,
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generics,
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ty_param_bounds,
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shape,
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);
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self.push_rewrite(item.span, rw);
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}
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ast::ItemKind::ExternCrate(_) => {
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let rw = rewrite_extern_crate(&self.get_context(), item);
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@ -71,3 +71,19 @@ trait Foo {
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type ItRev = <MergingUntypedTimeSeries<SliceSeries<SliceWindow>> as UntypedTimeSeries>::IterRev;
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type IteRev = <MergingUntypedTimeSeries<SliceSeries<SliceWindow>> as UntypedTimeSeries>::IterRev;
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}
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// Trait aliases
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trait FooBar =
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Foo
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+ Bar;
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trait FooBar <A, B, C>=
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Foo
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+ Bar;
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trait AAAAAAAAAAAAAAAAAA = BBBBBBBBBBBBBBBBBBB + CCCCCCCCCCCCCCCCCCCCCCCCCCCCC + DDDDDDDDDDDDDDDDDD;
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trait AAAAAAAAAAAAAAAAAAA = BBBBBBBBBBBBBBBBBBB + CCCCCCCCCCCCCCCCCCCCCCCCCCCCC + DDDDDDDDDDDDDDDDDD;
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trait AAAAAAAAAAAAAAAAAA = BBBBBBBBBBBBBBBBBBB + CCCCCCCCCCCCCCCCCCCCCCCCCCCCC + DDDDDDDDDDDDDDDDDDD;
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trait AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA<A, B, C, D, E> = FooBar;
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trait AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA<A, B, C, D, E> = FooBar;
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#[rustfmt_skip]
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trait FooBar = Foo
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+ Bar;
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@ -99,3 +99,24 @@ trait Foo {
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type IteRev =
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<MergingUntypedTimeSeries<SliceSeries<SliceWindow>> as UntypedTimeSeries>::IterRev;
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}
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// Trait aliases
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trait FooBar = Foo + Bar;
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trait FooBar<A, B, C> = Foo + Bar;
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trait AAAAAAAAAAAAAAAAAA = BBBBBBBBBBBBBBBBBBB + CCCCCCCCCCCCCCCCCCCCCCCCCCCCC + DDDDDDDDDDDDDDDDDD;
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trait AAAAAAAAAAAAAAAAAAA =
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BBBBBBBBBBBBBBBBBBB + CCCCCCCCCCCCCCCCCCCCCCCCCCCCC + DDDDDDDDDDDDDDDDDD;
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trait AAAAAAAAAAAAAAAAAA =
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BBBBBBBBBBBBBBBBBBB + CCCCCCCCCCCCCCCCCCCCCCCCCCCCC + DDDDDDDDDDDDDDDDDDD;
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trait AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA<A, B, C, D, E> =
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FooBar;
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trait AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA<
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A,
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B,
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C,
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D,
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E,
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> = FooBar;
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#[rustfmt_skip]
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trait FooBar = Foo
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+ Bar;
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