derive_error/
lib.rs

1//! Derive custom errors using macros 1.1
2
3extern crate proc_macro;
4extern crate syn;
5#[macro_use]
6extern crate quote;
7extern crate case;
8
9mod error;
10
11use error::Error;
12use proc_macro::TokenStream;
13
14#[proc_macro_derive(Error, attributes(error))]
15pub fn derive_error(input: TokenStream) -> TokenStream {
16    let source = input.to_string();
17    let ast = syn::parse_macro_input(&source).expect("failed to parse the error defination");
18    Error::new(ast)
19        .derive()
20        .parse()
21        .expect("failed to parse the derived output")
22}