as_derive_utils/
to_token_fn.rs
1use proc_macro2::TokenStream;
2use quote::ToTokens;
3
4use std::cell::RefCell;
5
6pub struct ToTokenFnMut<F> {
8 func: RefCell<F>,
9}
10
11impl<F> ToTokenFnMut<F>
12where
13 F: FnMut(&mut TokenStream),
14{
15 pub fn new(f: F) -> Self {
16 Self {
17 func: RefCell::new(f),
18 }
19 }
20 #[allow(dead_code)]
21 pub fn boxed<'a>(f: F) -> Box<dyn ToTokens + 'a>
22 where
23 F: 'a,
24 {
25 Box::new(Self::new(f))
26 }
27}
28
29impl<F> ToTokens for ToTokenFnMut<F>
30where
31 F: FnMut(&mut TokenStream),
32{
33 fn to_tokens(&self, tokens: &mut TokenStream) {
34 RefCell::borrow_mut(&self.func)(tokens);
35 }
36}