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
use crate::attribute::ExtendedAttributeList;
use crate::common::{Default, Identifier, Punctuated};
use crate::types::{AttributedType, Type};
pub type ArgumentList<'a> = Punctuated<Argument<'a>, term!(,)>;
ast_types! {
enum Argument<'a> {
Single(struct SingleArgument<'a> {
attributes: Option<ExtendedAttributeList<'a>>,
optional: Option<term!(optional)>,
type_: AttributedType<'a>,
identifier: Identifier<'a>,
default: Option<Default<'a>> = map!(
cond!(optional.is_some(), weedle!(Option<Default<'a>>)),
|default| default.unwrap_or(None)
),
}),
Variadic(struct VariadicArgument<'a> {
attributes: Option<ExtendedAttributeList<'a>>,
type_: Type<'a>,
ellipsis: term!(...),
identifier: Identifier<'a>,
}),
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::literal::{DecLit, DefaultValue, IntegerLit};
use crate::Parse;
test!(should_parse_single_argument { "short a" =>
"";
SingleArgument;
attributes.is_none();
optional.is_none();
identifier.0 == "a";
default.is_none();
});
test!(should_parse_variadic_argument { "short... a" =>
"";
VariadicArgument;
attributes.is_none();
identifier.0 == "a";
});
test!(should_parse_optional_single_argument { "optional short a" =>
"";
SingleArgument;
attributes.is_none();
optional.is_some();
identifier.0 == "a";
default.is_none();
});
test!(should_parse_optional_single_argument_with_default { "optional short a = 5" =>
"";
SingleArgument;
attributes.is_none();
optional.is_some();
identifier.0 == "a";
default == Some(Default {
assign: term!(=),
value: DefaultValue::Integer(IntegerLit::Dec(DecLit("5"))),
});
});
}