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| 1 | +// Copyright 2018 The Rust Project Developers. See the COPYRIGHT |
| 2 | +// file at the top-level directory of this distribution and at |
| 3 | +// http://rust-lang.org/COPYRIGHT. |
| 4 | +// |
| 5 | +// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| 6 | +// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| 7 | +// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| 8 | +// option. This file may not be copied, modified, or distributed |
| 9 | +// except according to those terms. |
| 10 | + |
| 11 | +#![feature(macro_literal_matcher)] |
| 12 | + |
| 13 | +macro_rules! mtester { |
| 14 | + ($l:literal) => { |
| 15 | + &format!("macro caught literal: {}", $l) |
| 16 | + }; |
| 17 | + ($e:expr) => { |
| 18 | + &format!("macro caught expr: {}", $e) |
| 19 | + }; |
| 20 | +} |
| 21 | + |
| 22 | +macro_rules! two_negative_literals { |
| 23 | + ($l1:literal $l2:literal) => { |
| 24 | + &format!("macro caught literals: {}, {}", $l1, $l2) |
| 25 | + }; |
| 26 | +} |
| 27 | + |
| 28 | +macro_rules! only_expr { |
| 29 | + ($e:expr) => { |
| 30 | + &format!("macro caught expr: {}", $e) |
| 31 | + }; |
| 32 | +} |
| 33 | + |
| 34 | +macro_rules! mtester_dbg { |
| 35 | + ($l:literal) => { |
| 36 | + &format!("macro caught literal: {:?}", $l) |
| 37 | + }; |
| 38 | + ($e:expr) => { |
| 39 | + &format!("macro caught expr: {:?}", $e) |
| 40 | + }; |
| 41 | +} |
| 42 | + |
| 43 | +macro_rules! catch_range { |
| 44 | + ($s:literal ... $e:literal) => { |
| 45 | + &format!("macro caught literal: {} ... {}", $s, $e) |
| 46 | + }; |
| 47 | + (($s:expr) ... ($e:expr)) => { // Must use ')' before '...' |
| 48 | + &format!("macro caught expr: {} ... {}", $s, $e) |
| 49 | + }; |
| 50 | +} |
| 51 | + |
| 52 | +macro_rules! pat_match { |
| 53 | + ($s:literal ... $e:literal) => { |
| 54 | + match 3 { |
| 55 | + $s ... $e => "literal, in range", |
| 56 | + _ => "literal, other", |
| 57 | + } |
| 58 | + }; |
| 59 | + ($s:pat) => { |
| 60 | + match 3 { |
| 61 | + $s => "pat, single", |
| 62 | + _ => "pat, other", |
| 63 | + } |
| 64 | + }; |
| 65 | +} |
| 66 | + |
| 67 | +macro_rules! match_attr { |
| 68 | + (#[$attr:meta] $e:literal) => { |
| 69 | + "attr matched literal" |
| 70 | + }; |
| 71 | + (#[$attr:meta] $e:expr) => { |
| 72 | + "attr matched expr" |
| 73 | + }; |
| 74 | +} |
| 75 | + |
| 76 | +macro_rules! match_produced_attr { |
| 77 | + ($lit: literal) => { |
| 78 | + // Struct with doc comment passed via $literal |
| 79 | + #[doc = $lit] |
| 80 | + struct LiteralProduced; |
| 81 | + }; |
| 82 | + ($expr: expr) => { |
| 83 | + struct ExprProduced; |
| 84 | + }; |
| 85 | +} |
| 86 | + |
| 87 | +macro_rules! test_user { |
| 88 | + ($s:literal, $e:literal) => { |
| 89 | + { |
| 90 | + let mut v = Vec::new(); |
| 91 | + for i in $s .. $e { |
| 92 | + v.push(i); |
| 93 | + } |
| 94 | + "literal" |
| 95 | + } |
| 96 | + }; |
| 97 | + ($s:expr, $e: expr) => { |
| 98 | + { |
| 99 | + let mut v = Vec::new(); |
| 100 | + for i in $s .. $e { |
| 101 | + v.push(i); |
| 102 | + } |
| 103 | + "expr" |
| 104 | + } |
| 105 | + }; |
| 106 | +} |
| 107 | + |
| 108 | +pub fn main() { |
| 109 | + // Cases where 'literal' catches |
| 110 | + assert_eq!(mtester!("str"), "macro caught literal: str"); |
| 111 | + assert_eq!(mtester!(2), "macro caught literal: 2"); |
| 112 | + assert_eq!(mtester!(2.2), "macro caught literal: 2.2"); |
| 113 | + assert_eq!(mtester!(1u32), "macro caught literal: 1"); |
| 114 | + assert_eq!(mtester!(0x32), "macro caught literal: 50"); |
| 115 | + assert_eq!(mtester!('c'), "macro caught literal: c"); |
| 116 | + assert_eq!(mtester!(-1.2), "macro caught literal: -1.2"); |
| 117 | + assert_eq!(two_negative_literals!(-2 -3), "macro caught literals: -2, -3"); |
| 118 | + assert_eq!(catch_range!(2 ... 3), "macro caught literal: 2 ... 3"); |
| 119 | + assert_eq!(match_attr!(#[attr] 1), "attr matched literal"); |
| 120 | + assert_eq!(test_user!(10, 20), "literal"); |
| 121 | + assert_eq!(mtester!(false), "macro caught literal: false"); |
| 122 | + assert_eq!(mtester!(true), "macro caught literal: true"); |
| 123 | + match_produced_attr!("a"); |
| 124 | + let _a = LiteralProduced; |
| 125 | + assert_eq!(pat_match!(1 ... 3), "literal, in range"); |
| 126 | + assert_eq!(pat_match!(4 ... 6), "literal, other"); |
| 127 | + |
| 128 | + // Cases where 'expr' catches |
| 129 | + assert_eq!(mtester!((-1.2)), "macro caught expr: -1.2"); |
| 130 | + assert_eq!(only_expr!(-1.2), "macro caught expr: -1.2"); |
| 131 | + assert_eq!(mtester!((1 + 3)), "macro caught expr: 4"); |
| 132 | + assert_eq!(mtester_dbg!(()), "macro caught expr: ()"); |
| 133 | + assert_eq!(catch_range!((1 + 1) ... (2 + 2)), "macro caught expr: 2 ... 4"); |
| 134 | + assert_eq!(match_attr!(#[attr] (1 + 2)), "attr matched expr"); |
| 135 | + assert_eq!(test_user!(10, (20 + 2)), "expr"); |
| 136 | + |
| 137 | + match_produced_attr!((3 + 2)); |
| 138 | + let _b = ExprProduced; |
| 139 | + |
| 140 | + // Cases where 'pat' matched |
| 141 | + assert_eq!(pat_match!(3), "pat, single"); |
| 142 | + assert_eq!(pat_match!(6), "pat, other"); |
| 143 | +} |
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