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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
//! Tests for `FromGenerics`, and - indirectly - `FromGenericParam`.
//! These tests assume `FromTypeParam` is working and only look at whether the wrappers for magic
//! fields are working as expected.
use darling::{
ast::{self, GenericParamExt},
util::{Ignored, WithOriginal},
FromDeriveInput, FromTypeParam, Result,
};
#[derive(FromDeriveInput)]
#[darling(attributes(lorem))]
struct MyReceiver {
pub generics: ast::Generics<ast::GenericParam<MyTypeParam>>,
}
#[derive(FromTypeParam)]
#[darling(attributes(lorem))]
struct MyTypeParam {
pub ident: syn::Ident,
#[darling(default)]
pub foo: bool,
pub bar: Option<String>,
}
fn fdi<T: FromDeriveInput>(src: &str) -> Result<T> {
FromDeriveInput::from_derive_input(&syn::parse_str(src).expect("Source parses"))
}
/// Verify that `ast::Generics` is populated correctly when there is no generics declaration
#[test]
fn no_generics() {
let rec: MyReceiver = fdi("struct Baz;").expect("Input is well-formed");
assert!(rec.generics.where_clause.is_none());
assert_eq!(rec.generics.params.len(), 0);
}
#[test]
#[allow(clippy::bool_assert_comparison)]
fn expand_some() {
let rec: MyReceiver = fdi(r#"
struct Baz<
'a,
#[lorem(foo)] T,
#[lorem(bar = "x")] U: Eq + ?Sized
>(&'a T, U);
"#)
.expect("Input is well-formed");
assert!(rec.generics.where_clause.is_none());
// Make sure we've preserved the lifetime def, though we don't do anything with it.
assert!(rec.generics.params[0].as_lifetime_def().is_some());
let mut ty_param_iter = rec.generics.type_params();
let first = ty_param_iter
.next()
.expect("type_params should not be empty");
assert!(first.bar.is_none());
assert!(first.foo);
assert_eq!(first.ident, "T");
let second = ty_param_iter
.next()
.expect("type_params should have a second value");
assert_eq!(
second
.bar
.as_ref()
.expect("Second type param should set bar"),
"x"
);
assert_eq!(second.foo, false);
assert_eq!(second.ident, "U");
}
/// Verify ≤0.4.1 behavior - where `generics` had to be `syn::Generics` - keeps working.
#[test]
fn passthrough() {
#[derive(FromDeriveInput)]
struct PassthroughReceiver {
pub generics: syn::Generics,
}
let rec: PassthroughReceiver = fdi(r#"
struct Baz<
'a,
#[lorem(foo)] T,
#[lorem(bar = "x")] U: Eq + ?Sized
>(&'a T, U);
"#)
.expect("Input is well-formed");
let mut type_param_iter = rec.generics.type_params();
assert!(type_param_iter.next().is_some());
}
/// Verify that `where_clause` is passed through when it exists.
/// As of 0.4.1, there is no `FromWhereClause` trait, so other types aren't supported
/// for that field.
#[test]
fn where_clause() {
let rec: MyReceiver = fdi(r#"
struct Baz<
'a,
#[lorem(foo)] T,
#[lorem(bar = "x")] U: Eq + ?Sized
>(&'a T, U) where T: Into<String>;
"#)
.expect("Input is well-formed");
assert!(rec.generics.where_clause.is_some());
}
/// Test that `WithOriginal` works for generics.
#[test]
fn with_original() {
#[derive(FromDeriveInput)]
struct WorigReceiver {
generics: WithOriginal<ast::Generics<ast::GenericParam<MyTypeParam>>, syn::Generics>,
}
let rec: WorigReceiver = fdi(r#"
struct Baz<
'a,
#[lorem(foo)] T,
#[lorem(bar = "x")] U: Eq + ?Sized
>(&'a T, U) where T: Into<String>;
"#)
.expect("Input is well-formed");
// Make sure we haven't lost anything in the conversion
assert_eq!(rec.generics.parsed.params.len(), 3);
assert_eq!(rec.generics.original.params.len(), 3);
let parsed_t: &MyTypeParam = rec.generics.parsed.params[1]
.as_type_param()
.expect("Second argument should be type param");
// Make sure the first type param in each case is T
assert_eq!(parsed_t.ident, "T");
assert_eq!(
rec.generics
.original
.type_params()
.next()
.expect("First type param should exist")
.ident,
"T"
);
// Make sure we actually parsed the first type param
assert!(parsed_t.foo);
assert!(parsed_t.bar.is_none());
}
/// Make sure generics can be ignored
#[test]
fn ignored() {
#[derive(FromDeriveInput)]
struct IgnoredReceiver {
generics: Ignored,
}
let rec: IgnoredReceiver = fdi(r#"
struct Baz<
'a,
#[lorem(foo)] T,
#[lorem(bar = "x")] U: Eq + ?Sized
>(&'a T, U) where T: Into<String>;
"#)
.expect("Input is well-formed");
assert_eq!(Ignored, rec.generics);
}
|
