weedle/
argument.rs

1use crate::attribute::ExtendedAttributeList;
2use crate::common::{Default, Identifier, Punctuated};
3use crate::types::{AttributedType, Type};
4
5/// Parses a list of argument. Ex: `double v1, double v2, double v3, optional double alpha`
6pub type ArgumentList<'a> = Punctuated<Argument<'a>, term!(,)>;
7
8ast_types! {
9    /// Parses an argument. Ex: `double v1|double... v1s`
10    enum Argument<'a> {
11        /// Parses `[attributes]? optional? attributedtype identifier ( = default )?`
12        ///
13        /// Note: `= default` is only allowed if `optional` is present
14        Single(struct SingleArgument<'a> {
15            attributes: Option<ExtendedAttributeList<'a>>,
16            optional: Option<term!(optional)>,
17            type_: AttributedType<'a>,
18            identifier: Identifier<'a>,
19            default: Option<Default<'a>> = nom::combinator::map(
20                nom::combinator::cond(optional.is_some(), weedle!(Option<Default<'a>>)),
21                |default| default.unwrap_or(None)
22            ),
23        }),
24        /// Parses `[attributes]? type... identifier`
25        Variadic(struct VariadicArgument<'a> {
26            attributes: Option<ExtendedAttributeList<'a>>,
27            type_: Type<'a>,
28            ellipsis: term!(...),
29            identifier: Identifier<'a>,
30        }),
31    }
32}
33
34#[cfg(test)]
35mod test {
36    use super::*;
37    use crate::literal::{DecLit, DefaultValue, IntegerLit};
38    use crate::Parse;
39
40    test!(should_parse_single_argument { "short a" =>
41        "";
42        SingleArgument;
43        attributes.is_none();
44        optional.is_none();
45        identifier.0 == "a";
46        default.is_none();
47    });
48
49    test!(should_parse_variadic_argument { "short... a" =>
50        "";
51        VariadicArgument;
52        attributes.is_none();
53        identifier.0 == "a";
54    });
55
56    test!(should_parse_optional_single_argument { "optional short a" =>
57        "";
58        SingleArgument;
59        attributes.is_none();
60        optional.is_some();
61        identifier.0 == "a";
62        default.is_none();
63    });
64
65    test!(should_parse_optional_single_argument_with_default { "optional short a = 5" =>
66        "";
67        SingleArgument;
68        attributes.is_none();
69        optional.is_some();
70        identifier.0 == "a";
71        default == Some(Default {
72            assign: term!(=),
73            value: DefaultValue::Integer(IntegerLit::Dec(DecLit("5"))),
74        });
75    });
76}
weedle/argument.rs

weedle/
argument.rs
