trait_derive/
lib.rs

1/*
2MIT License
3
4Copyright (c) 2017 David DeSimone
5
6Permission is hereby granted, free of charge, to any person obtaining a copy
7of this software and associated documentation files (the "Software"), to deal
8in the Software without restriction, including without limitation the rights
9to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10copies of the Software, and to permit persons to whom the Software is
11furnished to do so, subject to the following conditions:
12
13The above copyright notice and this permission notice shall be included in all
14copies or substantial portions of the Software.
15
16THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22SOFTWARE.
23*/
24
25#![feature(proc_macro)]
26#![recursion_limit = "256"]
27
28extern crate syn;
29extern crate quote;
30extern crate proc_macro;
31extern crate trait_derive_core;
32
33use proc_macro::TokenStream;
34use std::str::FromStr;
35use trait_derive_core::generate_trait;
36
37static ATTR_ERROR_MSG: &str = "Invalid trait name. Please enter another name. Names must be in the pattern #[make_trait(YOUR_NAME)]";
38
39#[proc_macro_attribute]
40pub fn make_trait(attr_ts: TokenStream, body_ts: TokenStream) -> TokenStream {
41    let attr_s = attr_ts.to_string();
42    let len = attr_s.len();
43    let name = if len == 0 {
44        None
45    } else {
46        // String opening '(' and closing ')'
47        assert!(attr_s.starts_with('('), ATTR_ERROR_MSG);
48        assert!(attr_s.ends_with(')'), ATTR_ERROR_MSG);
49        let slice = &attr_s[1..len-1];
50        Some(String::from_str(slice).expect(ATTR_ERROR_MSG))
51    };
52    
53    let raw_item = syn::parse_item(&body_ts.to_string()).unwrap();
54    let final_output = generate_trait(&raw_item, name);
55    TokenStream::from_str(final_output.as_str()).unwrap()
56}
trait_derive/lib.rs

trait_derive/
lib.rs
