darling_core 0.9.0

Helper crate for proc-macro library for reading attributes into structs when implementing custom derives. Use https://crates.io/crates/darling in your code.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

use syn::Generics;

use usage::{IdentSet, LifetimeSet};

/// Extension trait for pulling specific generics data from a generics AST representation.
pub trait GenericsExt {
    /// Get the set of all lifetimes declared by the syntax element.
    /// This does not look for usage of the lifetime; see `UsesLifetimes` for that.
    fn declared_lifetimes(&self) -> LifetimeSet;

    /// Get the set of all type parameters declared by the syntax element.
    /// This does not look for usage of the type parameter; see `UsesTypeParams` for that.
    fn declared_type_params(&self) -> IdentSet;
}

impl GenericsExt for Generics {
    fn declared_lifetimes(&self) -> LifetimeSet {
        self.lifetimes().map(|lt| lt.lifetime.clone()).collect()
    }

    fn declared_type_params(&self) -> IdentSet {
        self.type_params().map(|tp| tp.ident.clone()).collect()
    }
}