1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67

use proc_macro2::Span;

pub trait IntoSpans<S> {
    fn into_spans(self) -> S;
}

impl IntoSpans<[Span; 1]> for Span {
    fn into_spans(self) -> [Span; 1] {
        [self]
    }
}

impl IntoSpans<[Span; 2]> for Span {
    fn into_spans(self) -> [Span; 2] {
        [self, self]
    }
}

impl IntoSpans<[Span; 3]> for Span {
    fn into_spans(self) -> [Span; 3] {
        [self, self, self]
    }
}

impl IntoSpans<[Span; 1]> for [Span; 1] {
    fn into_spans(self) -> [Span; 1] {
        self
    }
}

impl IntoSpans<[Span; 2]> for [Span; 2] {
    fn into_spans(self) -> [Span; 2] {
        self
    }
}

impl IntoSpans<[Span; 3]> for [Span; 3] {
    fn into_spans(self) -> [Span; 3] {
        self
    }
}

#[cfg(feature = "parsing")]
pub trait FromSpans: Sized {
    fn from_spans(spans: &[Span]) -> Self;
}

#[cfg(feature = "parsing")]
impl FromSpans for [Span; 1] {
    fn from_spans(spans: &[Span]) -> Self {
        [spans[0]]
    }
}

#[cfg(feature = "parsing")]
impl FromSpans for [Span; 2] {
    fn from_spans(spans: &[Span]) -> Self {
        [spans[0], spans[1]]
    }
}

#[cfg(feature = "parsing")]
impl FromSpans for [Span; 3] {
    fn from_spans(spans: &[Span]) -> Self {
        [spans[0], spans[1], spans[2]]
    }
}