1 | use syn::Generics; |
2 | |
3 | use crate::usage::{IdentSet, LifetimeSet}; |
4 | |
5 | /// Extension trait for pulling specific generics data from a generics AST representation. |
6 | pub trait GenericsExt { |
7 | /// Get the set of all lifetimes declared by the syntax element. |
8 | /// This does not look for usage of the lifetime; see `UsesLifetimes` for that. |
9 | fn declared_lifetimes(&self) -> LifetimeSet; |
10 | |
11 | /// Get the set of all type parameters declared by the syntax element. |
12 | /// This does not look for usage of the type parameter; see `UsesTypeParams` for that. |
13 | fn declared_type_params(&self) -> IdentSet; |
14 | } |
15 | |
16 | impl GenericsExt for Generics { |
17 | fn declared_lifetimes(&self) -> LifetimeSet { |
18 | self.lifetimes().map(|lt: &LifetimeDef| lt.lifetime.clone()).collect() |
19 | } |
20 | |
21 | fn declared_type_params(&self) -> IdentSet { |
22 | self.type_params().map(|tp: &TypeParam| tp.ident.clone()).collect() |
23 | } |
24 | } |
25 | |