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
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
#![no_std]
#![warn(missing_docs)]
mod elements;
pub use elements::*;
mod attributes;
pub use attributes::*;
fn break_on_first_char(input: &str, c: char) -> Option<(&str, &str)> {
input.find(c).map(|b| {
let mut buf = [0_u8; 4];
let utf8_bytes_this_char = c.encode_utf8(&mut buf).len();
let (head, tail) = input.split_at(b);
let tail = &tail[utf8_bytes_this_char..];
(head, tail)
})
}
#[test]
fn test_break_on_first_char() {
assert_eq!(break_on_first_char("", '='), None);
assert_eq!(break_on_first_char("a", '='), None);
assert_eq!(break_on_first_char("a=", '='), Some(("a", "")));
assert_eq!(break_on_first_char("a=b", '='), Some(("a", "b")));
}
fn break_on_first_str<'i>(
input: &'i str,
needle: &str,
) -> Option<(&'i str, &'i str)> {
input.find(needle).map(|b| {
let (head, tail) = input.split_at(b);
let tail = &tail[needle.len()..];
(head, tail)
})
}
#[test]
fn test_break_on_first_str() {
assert_eq!(break_on_first_str("", "=="), None);
assert_eq!(break_on_first_str("a", "=="), None);
assert_eq!(break_on_first_str("a=", "=="), None);
assert_eq!(break_on_first_str("a==", "=="), Some(("a", "")));
assert_eq!(break_on_first_str("a==b", "=="), Some(("a", "b")));
}