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//! Many kinds of items or constructs can have generic parameters: functions,
//! structs, impls, traits, etc. This module provides a common HIR for these
//! generic parameters. See also the `Generics` type and the `generics_of` query
//! in rustc.
use std::sync::Arc;
use ra_syntax::ast::{TypeParamList, AstNode, NameOwner};
use crate::{db::HirDatabase, DefId, Name, AsName};
/// Data about a generic parameter (to a function, struct, impl, ...).
#[derive(Clone, PartialEq, Eq, Debug)]
pub struct GenericParam {
pub(crate) idx: u32,
pub(crate) name: Name,
}
/// Data about the generic parameters of a function, struct, impl, etc.
#[derive(Clone, PartialEq, Eq, Debug, Default)]
pub struct Generics {
pub(crate) params: Vec<GenericParam>,
}
impl Generics {
pub(crate) fn generics_query(db: &impl HirDatabase, def_id: DefId) -> Arc<Generics> {
let (_file_id, node) = def_id.source(db);
let mut generics = Generics::default();
if let Some(type_param_list) = node.children().find_map(TypeParamList::cast) {
for (idx, type_param) in type_param_list.type_params().enumerate() {
let name = type_param
.name()
.map(AsName::as_name)
.unwrap_or_else(Name::missing);
let param = GenericParam {
idx: idx as u32,
name,
};
generics.params.push(param);
}
}
Arc::new(generics)
}
pub(crate) fn find_by_name(&self, name: &Name) -> Option<&GenericParam> {
self.params.iter().find(|p| &p.name == name)
}
}
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