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1fbde52b MO |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | ||
39867fec | 3 | use proc_macro::{token_stream, Group, TokenTree}; |
1fbde52b MO |
4 | |
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()) | |
8 | } else { | |
9 | None | |
10 | } | |
11 | } | |
12 | ||
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()) | |
16 | } else { | |
17 | None | |
18 | } | |
19 | } | |
20 | ||
b13c9880 GG |
21 | pub(crate) fn try_string(it: &mut token_stream::IntoIter) -> Option<String> { |
22 | try_literal(it).and_then(|string| { | |
23 | if string.starts_with('\"') && string.ends_with('\"') { | |
24 | let content = &string[1..string.len() - 1]; | |
25 | if content.contains('\\') { | |
26 | panic!("Escape sequences in string literals not yet handled"); | |
27 | } | |
28 | Some(content.to_string()) | |
29 | } else if string.starts_with("r\"") { | |
30 | panic!("Raw string literals are not yet handled"); | |
1fbde52b MO |
31 | } else { |
32 | None | |
33 | } | |
34 | }) | |
35 | } | |
36 | ||
37 | pub(crate) fn expect_ident(it: &mut token_stream::IntoIter) -> String { | |
38 | try_ident(it).expect("Expected Ident") | |
39 | } | |
40 | ||
41 | pub(crate) fn expect_punct(it: &mut token_stream::IntoIter) -> char { | |
42 | if let TokenTree::Punct(punct) = it.next().expect("Reached end of token stream for Punct") { | |
43 | punct.as_char() | |
44 | } else { | |
45 | panic!("Expected Punct"); | |
46 | } | |
47 | } | |
48 | ||
b13c9880 GG |
49 | pub(crate) fn expect_string(it: &mut token_stream::IntoIter) -> String { |
50 | try_string(it).expect("Expected string") | |
51 | } | |
52 | ||
53 | pub(crate) fn expect_string_ascii(it: &mut token_stream::IntoIter) -> String { | |
54 | let string = try_string(it).expect("Expected string"); | |
55 | assert!(string.is_ascii(), "Expected ASCII string"); | |
56 | string | |
1fbde52b MO |
57 | } |
58 | ||
39867fec AL |
59 | pub(crate) fn expect_group(it: &mut token_stream::IntoIter) -> Group { |
60 | if let TokenTree::Group(group) = it.next().expect("Reached end of token stream for Group") { | |
61 | group | |
62 | } else { | |
63 | panic!("Expected Group"); | |
64 | } | |
65 | } | |
66 | ||
1fbde52b MO |
67 | pub(crate) fn expect_end(it: &mut token_stream::IntoIter) { |
68 | if it.next().is_some() { | |
69 | panic!("Expected end"); | |
70 | } | |
71 | } |