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24 lines
712 B
Rust
24 lines
712 B
Rust
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// SPDX-License-Identifier: GPL-2.0
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use proc_macro::{token_stream, Ident, TokenStream, TokenTree};
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use crate::helpers::expect_punct;
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fn expect_ident(it: &mut token_stream::IntoIter) -> Ident {
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if let Some(TokenTree::Ident(ident)) = it.next() {
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ident
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} else {
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panic!("Expected Ident")
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}
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}
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pub(crate) fn concat_idents(ts: TokenStream) -> TokenStream {
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let mut it = ts.into_iter();
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let a = expect_ident(&mut it);
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assert_eq!(expect_punct(&mut it), ',');
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let b = expect_ident(&mut it);
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assert!(it.next().is_none(), "only two idents can be concatenated");
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let res = Ident::new(&format!("{a}{b}"), b.span());
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TokenStream::from_iter([TokenTree::Ident(res)])
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}
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