1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
|
#[macro_export]
macro_rules! matches {
($expression:expr, $($pattern:tt)+) => {
_matches_tt_as_expr_hack! {
match $expression {
$($pattern)+ => true,
_ => false
}
}
}
}
/// Work around "error: unexpected token: `an interpolated tt`", whatever that means.
#[macro_export]
macro_rules! _matches_tt_as_expr_hack {
($value:expr) => ($value)
}
#[macro_export]
macro_rules! assert_matches {
($expression:expr, $($pattern:tt)+) => {
_matches_tt_as_expr_hack! {
match $expression {
$($pattern)+ => (),
ref e => panic!("assertion failed: `{:?}` does not match `{}`", e, stringify!($($pattern)+)),
}
}
}
}
#[macro_export]
macro_rules! debug_assert_matches {
($($arg:tt)*) => (if cfg!(debug_assertions) { assert_matches!($($arg)*); })
}
#[test]
fn matches_works() {
let foo = Some("-12");
assert!(matches!(foo, Some(bar) if
matches!(bar.as_bytes()[0], b'+' | b'-') &&
matches!(bar.as_bytes()[1], b'0'...b'9')
));
}
#[test]
fn assert_matches_works() {
let foo = Some("-12");
assert_matches!(foo, Some(bar) if
matches!(bar.as_bytes()[0], b'+' | b'-') &&
matches!(bar.as_bytes()[1], b'0'...b'9')
);
}
#[test]
#[should_panic(expected = "assertion failed: `Some(\"-AB\")` does not match ")]
fn assert_matches_panics() {
let foo = Some("-AB");
assert_matches!(foo, Some(bar) if
matches!(bar.as_bytes()[0], b'+' | b'-') &&
matches!(bar.as_bytes()[1], b'0'...b'9')
);
}
|
