darling_core/usage/
generics_ext.rs

1use syn::Generics;
2
3use crate::usage::{IdentSet, LifetimeSet};
4
5/// Extension trait for pulling specific generics data from a generics AST representation.
6pub 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
16impl GenericsExt for Generics {
17    fn declared_lifetimes(&self) -> LifetimeSet {
18        self.lifetimes().map(|lt| lt.lifetime.clone()).collect()
19    }
20
21    fn declared_type_params(&self) -> IdentSet {
22        self.type_params().map(|tp| tp.ident.clone()).collect()
23    }
24}