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use crate::ast;
use crate::{Id, OptionSpanned, Parse, ParseError, Parser, Spanned, ToTokens};
/// An enum item.
///
/// # Examples
///
/// ```rust
/// use rune::{testing, ast};
///
/// testing::roundtrip::<ast::ItemEnum>("enum Foo { Bar(a), Baz(b), Empty() }");
/// testing::roundtrip::<ast::ItemEnum>("enum Foo { Bar(a), Baz(b), #[default_value = \"zombie\"] Empty() }");
/// testing::roundtrip::<ast::ItemEnum>("#[repr(Rune)] enum Foo { Bar(a), Baz(b), #[default_value = \"zombie\"] Empty() }");
/// testing::roundtrip::<ast::ItemEnum>("pub enum Color { Blue, Red, Green }");
/// ```
#[derive(Debug, Clone, PartialEq, Eq, Parse, ToTokens, Spanned)]
#[rune(parse = "meta_only")]
pub struct ItemEnum {
/// The attributes for the enum block
#[rune(iter, meta)]
pub attributes: Vec<ast::Attribute>,
/// The visibility of the `enum` item
#[rune(optional, meta)]
pub visibility: ast::Visibility,
/// The `enum` token.
pub enum_token: T![enum],
/// The name of the enum.
pub name: ast::Ident,
/// Variants in the enum.
pub variants: ast::Braced<ItemVariant, T![,]>,
}
item_parse!(Enum, ItemEnum, "enum item");
/// An enum variant.
#[derive(Debug, Clone, PartialEq, Eq, Parse, ToTokens, Spanned)]
pub struct ItemVariant {
/// Opaque identifier of variant.
#[rune(id)]
pub id: Option<Id>,
/// The attributes associated with the variant.
#[rune(iter)]
pub attributes: Vec<ast::Attribute>,
/// The name of the variant.
pub name: ast::Ident,
/// The body of the variant.
#[rune(optional)]
pub body: ItemVariantBody,
}
/// An item body declaration.
#[derive(Debug, Clone, PartialEq, Eq, ToTokens, OptionSpanned)]
pub enum ItemVariantBody {
/// An empty enum body.
UnitBody,
/// A tuple struct body.
TupleBody(ast::Parenthesized<ast::Field, T![,]>),
/// A regular struct body.
StructBody(ast::Braced<ast::Field, T![,]>),
}
impl ItemVariantBody {
/// Iterate over the fields of the body.
pub fn fields(&self) -> impl Iterator<Item = &'_ (ast::Field, Option<T![,]>)> {
match self {
ItemVariantBody::UnitBody => IntoIterator::into_iter(&[]),
ItemVariantBody::TupleBody(body) => body.iter(),
ItemVariantBody::StructBody(body) => body.iter(),
}
}
}
/// Parse implementation for a struct body.
///
/// # Examples
///
/// ```rust
/// use rune::{testing, ast};
///
/// testing::roundtrip::<ast::ItemVariantBody>("( a, b, c )");
/// testing::roundtrip::<ast::ItemVariantBody>("{ a, b, c }");
/// testing::roundtrip::<ast::ItemVariantBody>("( #[serde(default)] a, b, c )");
/// testing::roundtrip::<ast::ItemVariantBody>("{ a, #[debug(skip)] b, c }");
/// ```
impl Parse for ItemVariantBody {
fn parse(p: &mut Parser<'_>) -> Result<Self, ParseError> {
Ok(match p.nth(0)? {
K!['('] => Self::TupleBody(p.parse()?),
K!['{'] => Self::StructBody(p.parse()?),
_ => Self::UnitBody,
})
}
}