1 | #![allow (clippy::uninlined_format_args)] |
2 | |
3 | #[macro_use ] |
4 | mod macros; |
5 | |
6 | use proc_macro2::{Delimiter, Group, Literal, Punct, Spacing, TokenStream, TokenTree}; |
7 | use syn::Expr; |
8 | |
9 | #[test] |
10 | fn test_grouping() { |
11 | let tokens: TokenStream = TokenStream::from_iter(vec![ |
12 | TokenTree::Literal(Literal::i32_suffixed(1)), |
13 | TokenTree::Punct(Punct::new('+' , Spacing::Alone)), |
14 | TokenTree::Group(Group::new( |
15 | Delimiter::None, |
16 | TokenStream::from_iter(vec![ |
17 | TokenTree::Literal(Literal::i32_suffixed(2)), |
18 | TokenTree::Punct(Punct::new('+' , Spacing::Alone)), |
19 | TokenTree::Literal(Literal::i32_suffixed(3)), |
20 | ]), |
21 | )), |
22 | TokenTree::Punct(Punct::new('*' , Spacing::Alone)), |
23 | TokenTree::Literal(Literal::i32_suffixed(4)), |
24 | ]); |
25 | |
26 | assert_eq!(tokens.to_string(), "1i32 + 2i32 + 3i32 * 4i32" ); |
27 | |
28 | snapshot!(tokens as Expr, @r###" |
29 | Expr::Binary { |
30 | left: Expr::Lit { |
31 | lit: 1i32, |
32 | }, |
33 | op: BinOp::Add, |
34 | right: Expr::Binary { |
35 | left: Expr::Group { |
36 | expr: Expr::Binary { |
37 | left: Expr::Lit { |
38 | lit: 2i32, |
39 | }, |
40 | op: BinOp::Add, |
41 | right: Expr::Lit { |
42 | lit: 3i32, |
43 | }, |
44 | }, |
45 | }, |
46 | op: BinOp::Mul, |
47 | right: Expr::Lit { |
48 | lit: 4i32, |
49 | }, |
50 | }, |
51 | } |
52 | "### ); |
53 | } |
54 | |