1 | use proc_macro2::extra::DelimSpan; |
2 | use proc_macro2::{Delimiter, Group, Span, TokenStream}; |
3 | |
4 | #[doc (hidden)] |
5 | pub trait IntoSpans<S> { |
6 | fn into_spans(self) -> S; |
7 | } |
8 | |
9 | impl IntoSpans<Span> for Span { |
10 | fn into_spans(self) -> Span { |
11 | self |
12 | } |
13 | } |
14 | |
15 | impl IntoSpans<[Span; 1]> for Span { |
16 | fn into_spans(self) -> [Span; 1] { |
17 | [self] |
18 | } |
19 | } |
20 | |
21 | impl IntoSpans<[Span; 2]> for Span { |
22 | fn into_spans(self) -> [Span; 2] { |
23 | [self, self] |
24 | } |
25 | } |
26 | |
27 | impl IntoSpans<[Span; 3]> for Span { |
28 | fn into_spans(self) -> [Span; 3] { |
29 | [self, self, self] |
30 | } |
31 | } |
32 | |
33 | impl IntoSpans<[Span; 1]> for [Span; 1] { |
34 | fn into_spans(self) -> [Span; 1] { |
35 | self |
36 | } |
37 | } |
38 | |
39 | impl IntoSpans<[Span; 2]> for [Span; 2] { |
40 | fn into_spans(self) -> [Span; 2] { |
41 | self |
42 | } |
43 | } |
44 | |
45 | impl IntoSpans<[Span; 3]> for [Span; 3] { |
46 | fn into_spans(self) -> [Span; 3] { |
47 | self |
48 | } |
49 | } |
50 | |
51 | impl IntoSpans<DelimSpan> for Span { |
52 | fn into_spans(self) -> DelimSpan { |
53 | let mut group: Group = Group::new(Delimiter::None, stream:TokenStream::new()); |
54 | group.set_span(self); |
55 | group.delim_span() |
56 | } |
57 | } |
58 | |
59 | impl IntoSpans<DelimSpan> for DelimSpan { |
60 | fn into_spans(self) -> DelimSpan { |
61 | self |
62 | } |
63 | } |
64 | |