76 lines
2.4 KiB
Rust
76 lines
2.4 KiB
Rust
use crate::attribute::ExtendedAttributeList;
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use crate::common::{Default, Identifier, Punctuated};
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use crate::types::{AttributedType, Type};
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/// Parses a list of argument. Ex: `double v1, double v2, double v3, optional double alpha`
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pub type ArgumentList<'a> = Punctuated<Argument<'a>, term!(,)>;
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ast_types! {
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/// Parses an argument. Ex: `double v1|double... v1s`
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enum Argument<'a> {
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/// Parses `[attributes]? optional? attributedtype identifier ( = default )?`
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///
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/// Note: `= default` is only allowed if `optional` is present
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Single(struct SingleArgument<'a> {
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attributes: Option<ExtendedAttributeList<'a>>,
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optional: Option<term!(optional)>,
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type_: AttributedType<'a>,
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identifier: Identifier<'a>,
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default: Option<Default<'a>> = nom::combinator::map(
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nom::combinator::cond(optional.is_some(), weedle!(Option<Default<'a>>)),
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|default| default.unwrap_or(None)
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),
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}),
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/// Parses `[attributes]? type... identifier`
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Variadic(struct VariadicArgument<'a> {
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attributes: Option<ExtendedAttributeList<'a>>,
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type_: Type<'a>,
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ellipsis: term!(...),
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identifier: Identifier<'a>,
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}),
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use crate::literal::{DecLit, DefaultValue, IntegerLit};
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use crate::Parse;
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test!(should_parse_single_argument { "short a" =>
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"";
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SingleArgument;
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attributes.is_none();
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optional.is_none();
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identifier.0 == "a";
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default.is_none();
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});
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test!(should_parse_variadic_argument { "short... a" =>
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"";
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VariadicArgument;
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attributes.is_none();
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identifier.0 == "a";
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});
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test!(should_parse_optional_single_argument { "optional short a" =>
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"";
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SingleArgument;
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attributes.is_none();
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optional.is_some();
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identifier.0 == "a";
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default.is_none();
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});
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test!(should_parse_optional_single_argument_with_default { "optional short a = 5" =>
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"";
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SingleArgument;
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attributes.is_none();
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optional.is_some();
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identifier.0 == "a";
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default == Some(Default {
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assign: term!(=),
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value: DefaultValue::Integer(IntegerLit::Dec(DecLit("5"))),
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});
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});
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}
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