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use crate::attribute::ExtendedAttributeList;
use crate::common::{Default, Identifier, Punctuated};
use crate::types::{AttributedType, Type};
/// Parses a list of argument. Ex: `double v1, double v2, double v3, optional double alpha`
pub type ArgumentList<'a> = Punctuated<Argument<'a>, term!(,)>;
ast_types! {
/// Parses an argument. Ex: `double v1|double... v1s`
enum Argument<'a> {
/// Parses `[attributes]? optional? attributedtype identifier ( = default )?`
///
/// Note: `= default` is only allowed if `optional` is present
Single(struct SingleArgument<'a> {
attributes: Option<ExtendedAttributeList<'a>>,
optional: Option<term!(optional)>,
type_: AttributedType<'a>,
identifier: Identifier<'a>,
default: Option<Default<'a>> = nom::combinator::map(
nom::combinator::cond(optional.is_some(), weedle!(Option<Default<'a>>)),
|default| default.unwrap_or(None)
),
}),
/// Parses `[attributes]? type... identifier`
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"))),
});
});
}