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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
#[macro_use]
mod macros;
use proc_macro2::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree};
use quote::{quote, ToTokens};
use std::iter::FromIterator;
use syn::{parse_quote, Expr, Type, TypePath};
#[test]
fn parse_interpolated_leading_component() {
// mimics the token stream corresponding to `$mod::rest`
let tokens = TokenStream::from_iter(vec![
TokenTree::Group(Group::new(Delimiter::None, quote! { first })),
TokenTree::Punct(Punct::new(':', Spacing::Joint)),
TokenTree::Punct(Punct::new(':', Spacing::Alone)),
TokenTree::Ident(Ident::new("rest", Span::call_site())),
]);
snapshot!(tokens.clone() as Expr, @r###"
Expr::Path {
path: Path {
segments: [
PathSegment {
ident: "first",
arguments: None,
},
PathSegment {
ident: "rest",
arguments: None,
},
],
},
}
"###);
snapshot!(tokens as Type, @r###"
Type::Path {
path: Path {
segments: [
PathSegment {
ident: "first",
arguments: None,
},
PathSegment {
ident: "rest",
arguments: None,
},
],
},
}
"###);
}
#[test]
fn print_incomplete_qpath() {
// qpath with `as` token
let mut ty: TypePath = parse_quote!(<Self as A>::Q);
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`< Self as A > :: Q`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`< Self as A > ::`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`< Self >`)
"###);
assert!(ty.path.segments.pop().is_none());
// qpath without `as` token
let mut ty: TypePath = parse_quote!(<Self>::A::B);
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`< Self > :: A :: B`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`< Self > :: A ::`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`< Self > ::`)
"###);
assert!(ty.path.segments.pop().is_none());
// normal path
let mut ty: TypePath = parse_quote!(Self::A::B);
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`Self :: A :: B`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`Self :: A ::`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(`Self ::`)
"###);
assert!(ty.path.segments.pop().is_some());
snapshot!(ty.to_token_stream(), @r###"
TokenStream(``)
"###);
assert!(ty.path.segments.pop().is_none());
}
#[test]
fn parse_parenthesized_path_arguments_with_disambiguator() {
#[rustfmt::skip]
let tokens = quote!(FnOnce::() -> !);
snapshot!(tokens as Type, @r###"
Type::Path {
path: Path {
segments: [
PathSegment {
ident: "FnOnce",
arguments: PathArguments::Parenthesized {
output: Type(
Type::Never,
),
},
},
],
},
}
"###);
}
|
