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60f18c22 BRB |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
3 | use proc_macro::{token_stream, Ident, TokenStream, TokenTree}; | |
4 | ||
5 | use crate::helpers::expect_punct; | |
6 | ||
7 | fn expect_ident(it: &mut token_stream::IntoIter) -> Ident { | |
8 | if let Some(TokenTree::Ident(ident)) = it.next() { | |
9 | ident | |
10 | } else { | |
11 | panic!("Expected Ident") | |
12 | } | |
13 | } | |
14 | ||
15 | pub(crate) fn concat_idents(ts: TokenStream) -> TokenStream { | |
16 | let mut it = ts.into_iter(); | |
17 | let a = expect_ident(&mut it); | |
18 | assert_eq!(expect_punct(&mut it), ','); | |
19 | let b = expect_ident(&mut it); | |
20 | assert!(it.next().is_none(), "only two idents can be concatenated"); | |
21 | let res = Ident::new(&format!("{a}{b}"), b.span()); | |
22 | TokenStream::from_iter([TokenTree::Ident(res)]) | |
23 | } |