uwuid/
lib.rs

1use std::{fmt::Display, str::FromStr};
2
3use rand::random;
4use time::OffsetDateTime;
5
6#[cfg(test)]
7mod tests {
8    use crate::UwuId;
9
10    #[test]
11    fn generate_uwuid() {
12        let uwuid = UwuId::new();
13        let uwuid_parsed: UwuId = format!("{}", uwuid).parse().unwrap();
14        assert_eq!(uwuid, uwuid_parsed);
15    }
16}
17
18static UWUID_HEX_DIGITS: [char; 16] = [
19    'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '🥰', '😳', '🥺', '🤗', '😍', ',',
20];
21
22#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
23pub struct UwuId(u128);
24
25impl UwuId {
26    pub fn new() -> Self {
27        Self(
28            (((OffsetDateTime::now_utc().unix_timestamp_nanos() as u128) / 1_000_000_u128) << 80)
29                + (random::<u128>() & 0xffffffffffffffffffff),
30        )
31    }
32    pub fn time(&self) -> Result<OffsetDateTime, time::error::ComponentRange> {
33        OffsetDateTime::from_unix_timestamp_nanos((self.0 >> 80) as i128 * 1_000_000)
34    }
35}
36
37impl Display for UwuId {
38    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
39        for i in 0..32 {
40            let mask = 0xF << (i * 4);
41            let digit = (self.0 & mask) >> (i * 4);
42            write!(f, "{}", UWUID_HEX_DIGITS[digit as usize])?;
43        }
44        Ok(())
45    }
46}
47
48impl FromStr for UwuId {
49    type Err = std::fmt::Error;
50    fn from_str(s: &str) -> Result<Self, Self::Err> {
51        let mut id = 0_u128;
52        for digit in s.chars().rev() {
53            id <<= 4;
54            id += UWUID_HEX_DIGITS
55                .iter()
56                .position(|e| *e == digit)
57                .ok_or(std::fmt::Error)? as u128;
58        }
59        Ok(Self(id))
60    }
61}
uwuid/lib.rs

uwuid/
lib.rs
