noodles_vcf/record/samples/
keys.rs

1use std::iter;
2
3/// VCF record samples keys.
4#[derive(Debug, Eq, PartialEq)]
5pub struct Keys<'a>(&'a str);
6
7impl<'a> Keys<'a> {
8    pub(super) fn new(src: &'a str) -> Self {
9        Self(src)
10    }
11
12    /// Returns an iterator over keys.
13    pub fn iter(&self) -> impl Iterator<Item = &'a str> + 'a {
14        let mut src = self.0;
15
16        iter::from_fn(move || {
17            if src.is_empty() {
18                None
19            } else {
20                Some(parse_key(&mut src))
21            }
22        })
23    }
24}
25
26fn parse_key<'a>(src: &mut &'a str) -> &'a str {
27    const DELIMITER: char = ':';
28
29    let (buf, rest) = src
30        .split_once(DELIMITER)
31        .unwrap_or_else(|| src.split_at(src.len()));
32
33    *src = rest;
34
35    buf
36}
37
38#[cfg(test)]
39mod tests {
40    use super::*;
41
42    #[test]
43    fn test_iter() {
44        let genotypes = Keys::new("");
45        assert!(genotypes.iter().next().is_none());
46
47        let keys = Keys::new("GT:GQ");
48        let actual: Vec<_> = keys.iter().collect();
49        let expected = ["GT", "GQ"];
50        assert_eq!(actual, expected);
51    }
52}
noodles_vcf/record/samples/keys.rs

noodles_vcf/record/samples/
keys.rs
