klavier-core 0.1.15

Core library of klavier.
Documentation 
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

use std::fmt::Display;

use regex::Regex;

#[derive(PartialEq, Eq, Clone, Copy, Debug)]
pub struct Location {
    bar_no: usize,
    offset: usize,
}

impl Location {
    pub fn new(bar_no: usize, offset: usize) -> Self {
        Self { bar_no, offset }
    }

    pub fn bar_no(&self) -> usize { self.bar_no }
    pub fn offset(&self) -> usize { self.offset }
    pub fn parse(s: &str) -> Option<Location> { parse_location(s) }
}

impl Display for Location {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        write!(f, "{}:{}", self.bar_no, self.offset)
    }
}


#[allow(clippy::declare_interior_mutable_const)]
const LOCATION_PATTERN: once_cell::unsync::Lazy<Regex> = once_cell::unsync::Lazy::new(|| Regex::new(r"^(\d+):(\d+)$").unwrap());
pub fn parse_location(s: &str) -> Option<Location> {
    let lp = LOCATION_PATTERN;
    lp.captures(s).map(|c| {
        Location {
            bar_no: c.get(1).unwrap().as_str().parse().unwrap(),
            offset: c.get(2).unwrap().as_str().parse().unwrap(),
        }
    })
}

#[cfg(test)]
mod tests {
    use crate::location::{parse_location, Location};

    #[test]
    fn parse_fail() {
        assert_eq!(parse_location(""), None);
        assert_eq!(parse_location("012"), None);
        assert_eq!(parse_location("01:"), None);
        assert_eq!(parse_location(":01"), None);
    }

    #[test]
    fn parse_ok() {
        assert_eq!(parse_location("123:456"), Some(Location::new(123, 456)));
    }
}