src/to_tokens.rs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36

use proc_macro::*;
use std::iter;

pub(crate) trait ToTokens {
    fn to_tokens(&self, tokens: &mut TokenStream);

    fn to_token_stream(&self) -> TokenStream {
        let mut tokens = TokenStream::new();
        self.to_tokens(&mut tokens);
        tokens
    }
}

impl ToTokens for Ident {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(iter::once(TokenTree::Ident(self.clone())));
    }
}

impl ToTokens for Literal {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(iter::once(TokenTree::Literal(self.clone())));
    }
}

impl ToTokens for TokenTree {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(iter::once(self.clone()));
    }
}

impl ToTokens for TokenStream {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        tokens.extend(self.clone());
    }
}