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e74abb32 XL |
1 | #[macro_use] |
2 | mod macros; | |
3 | ||
4 | use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, TokenStream, TokenTree}; | |
e74abb32 | 5 | use std::iter::FromIterator; |
29967ef6 | 6 | use syn::Expr; |
e74abb32 XL |
7 | |
8 | #[test] | |
9 | fn test_grouping() { | |
10 | let tokens: TokenStream = TokenStream::from_iter(vec![ | |
11 | TokenTree::Literal(Literal::i32_suffixed(1)), | |
12 | TokenTree::Punct(Punct::new('+', Spacing::Alone)), | |
13 | TokenTree::Group(Group::new( | |
14 | Delimiter::None, | |
15 | TokenStream::from_iter(vec![ | |
16 | TokenTree::Literal(Literal::i32_suffixed(2)), | |
17 | TokenTree::Punct(Punct::new('+', Spacing::Alone)), | |
18 | TokenTree::Literal(Literal::i32_suffixed(3)), | |
19 | ]), | |
20 | )), | |
21 | TokenTree::Punct(Punct::new('*', Spacing::Alone)), | |
22 | TokenTree::Literal(Literal::i32_suffixed(4)), | |
23 | ]); | |
24 | ||
1b1a35ee | 25 | assert_eq!(tokens.to_string(), "1i32 + 2i32 + 3i32 * 4i32"); |
e74abb32 XL |
26 | |
27 | snapshot!(tokens as Expr, @r###" | |
60c5eb7d XL |
28 | Expr::Binary { |
29 | left: Expr::Lit { | |
30 | lit: 1i32, | |
31 | }, | |
32 | op: Add, | |
33 | right: Expr::Binary { | |
34 | left: Expr::Group { | |
35 | expr: Expr::Binary { | |
36 | left: Expr::Lit { | |
37 | lit: 2i32, | |
38 | }, | |
39 | op: Add, | |
40 | right: Expr::Lit { | |
41 | lit: 3i32, | |
42 | }, | |
43 | }, | |
44 | }, | |
45 | op: Mul, | |
46 | right: Expr::Lit { | |
47 | lit: 4i32, | |
48 | }, | |
49 | }, | |
50 | } | |
e74abb32 XL |
51 | "###); |
52 | } |