1 // SPDX-License-Identifier: GPL-2.0
3 use proc_macro::{token_stream, TokenTree};
5 pub(crate) fn try_ident(it: &mut token_stream::IntoIter) -> Option<String> {
6 if let Some(TokenTree::Ident(ident)) = it.next() {
7 Some(ident.to_string())
13 pub(crate) fn try_literal(it: &mut token_stream::IntoIter) -> Option<String> {
14 if let Some(TokenTree::Literal(literal)) = it.next() {
15 Some(literal.to_string())
21 pub(crate) fn try_byte_string(it: &mut token_stream::IntoIter) -> Option<String> {
22 try_literal(it).and_then(|byte_string| {
23 if byte_string.starts_with("b\"") && byte_string.ends_with('\"') {
24 Some(byte_string[2..byte_string.len() - 1].to_string())
31 pub(crate) fn expect_ident(it: &mut token_stream::IntoIter) -> String {
32 try_ident(it).expect("Expected Ident")
35 pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> char {
36 if let TokenTree::Punct(punct) = it.next().expect("Reached end of token stream for Punct") {
39 panic!("Expected Punct");
43 pub(crate) fn expect_byte_string(it: &mut token_stream::IntoIter) -> String {
44 try_byte_string(it).expect("Expected byte string")
47 pub(crate) fn expect_end(it: &mut token_stream::IntoIter) {
48 if it.next().is_some() {
49 panic!("Expected end");