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
|
use std::hash::{Hash, Hasher};
use unicode_normalization::{self, IsNormalized, UnicodeNormalization};
#[repr(transparent)]
#[derive(Copy, Clone, Debug, Eq)]
pub struct UniStr<'a>(pub &'a str);
impl Hash for UniStr<'_> {
fn hash<H: Hasher>(&self, state: &mut H) {
/* In the ASCII common case we use .bytes() to avoid decoding
* every codepoint (a no-op in ASCII) */
if self.0.is_ascii() {
self.0.bytes().for_each(|c| (c as char).hash(state));
} else if unicode_normalization::is_nfkd_quick(self.0.chars())
== IsNormalized::Yes
{
self.0.chars().for_each(|c| c.hash(state));
} else {
self.0.nfkd().for_each(|c| c.hash(state));
}
}
}
impl PartialEq for UniStr<'_> {
fn eq(&self, other: &Self) -> bool {
/* Most code is ASCII, and normalization is obviously a lot
* slower than not normalizing, so we try to only normalize when
* we have to */
if self.0.is_ascii() && other.0.is_ascii() {
return self.0 == other.0;
}
return match (
unicode_normalization::is_nfkd_quick(self.0.chars())
== IsNormalized::Yes,
unicode_normalization::is_nfkd_quick(other.0.chars())
== IsNormalized::Yes,
) {
(true, true) => self.0 == other.0,
(true, false) => {
self.0.chars().map(|b| b as char).eq(other.0.nfkd())
},
(false, true) => {
self.0.nfkd().eq(other.0.chars().map(|b| b as char))
},
(false, false) => self.0.nfkd().eq(other.0.nfkd()),
};
}
}
#[cfg(test)]
mod tests {
use std::hash::{DefaultHasher, Hash, Hasher};
use super::UniStr;
#[test]
fn test_unistr_eq() {
assert_eq!(UniStr("fishi"), UniStr("fishᵢ"));
assert_eq!(UniStr("fishi"), UniStr("fishi"));
assert_eq!(UniStr("fishi"), UniStr("fishᵢ"));
assert_eq!(UniStr("fishᵢ"), UniStr("fishᵢ"));
assert_eq!(UniStr("corné"), UniStr("corné"));
}
#[test]
fn test_unistr_hash() {
for (lhs, rhs) in &[
(UniStr("fishi"), UniStr("fishᵢ")),
(UniStr("fishi"), UniStr("fishi")),
(UniStr("fishi"), UniStr("fishᵢ")),
(UniStr("fishᵢ"), UniStr("fishᵢ")),
(UniStr("corné"), UniStr("corné")),
] {
let mut hashl = DefaultHasher::new();
let mut hashr = DefaultHasher::new();
lhs.hash(&mut hashl);
rhs.hash(&mut hashr);
assert_eq!(hashl.finish(), hashr.finish());
}
}
}
|
