xref: /third_party/rust/crates/syn/src/span.rs (revision fad3a1d3) 
1use proc_macro2::extra::DelimSpan;
2use proc_macro2::{Delimiter, Group, Span, TokenStream};
3
4#[doc(hidden)]
5pub trait IntoSpans<S> {
6    fn into_spans(self) -> S;
7}
8
9impl IntoSpans<Span> for Span {
10    fn into_spans(self) -> Span {
11        self
12    }
13}
14
15impl IntoSpans<[Span; 1]> for Span {
16    fn into_spans(self) -> [Span; 1] {
17        [self]
18    }
19}
20
21impl IntoSpans<[Span; 2]> for Span {
22    fn into_spans(self) -> [Span; 2] {
23        [self, self]
24    }
25}
26
27impl IntoSpans<[Span; 3]> for Span {
28    fn into_spans(self) -> [Span; 3] {
29        [self, self, self]
30    }
31}
32
33impl IntoSpans<[Span; 1]> for [Span; 1] {
34    fn into_spans(self) -> [Span; 1] {
35        self
36    }
37}
38
39impl IntoSpans<[Span; 2]> for [Span; 2] {
40    fn into_spans(self) -> [Span; 2] {
41        self
42    }
43}
44
45impl IntoSpans<[Span; 3]> for [Span; 3] {
46    fn into_spans(self) -> [Span; 3] {
47        self
48    }
49}
50
51impl IntoSpans<DelimSpan> for Span {
52    fn into_spans(self) -> DelimSpan {
53        let mut group = Group::new(Delimiter::None, TokenStream::new());
54        group.set_span(self);
55        group.delim_span()
56    }
57}
58
59impl IntoSpans<DelimSpan> for DelimSpan {
60    fn into_spans(self) -> DelimSpan {
61        self
62    }
63}
64