more-itertools 0.1.6

A rust implementation of python more-itertools
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
57
58
59
60
61
62

use crate::error::Error;
use crate::others::cache_until::cache_until;

pub fn split_before<T>(iter: Box<dyn Iterator<Item = Result<T,Error>>>, 
    pred: fn(&T) -> Result<bool, Error>,
    maxsplit: i128
) -> Box<dyn Iterator<Item = Result<Vec<T>, Error>>>
where 
T: Clone + 'static
{
    cache_until(iter, pred, maxsplit, false)
}

#[cfg(test)]
mod tests {

    use crate::utils::generate_okok_iterator;

    use super::*;

    #[test]
    fn test1() {
        let v = vec![0,1,2,3,4,5,6,7,8,9];
        let mut r = split_before(generate_okok_iterator(v), |x|{Ok(x%3==0)}, -1);
        assert_eq!(Some(Ok(Vec::<i32>::new())), r.next());
        assert_eq!(Some(Ok(vec![0,1,2])), r.next());
        assert_eq!(Some(Ok(vec![3,4,5])), r.next());
        assert_eq!(Some(Ok(vec![6,7,8])), r.next());
        assert_eq!(Some(Ok(vec![9])), r.next());
        assert_eq!(None, r.next());
        assert_eq!(None, r.next());

        let v = vec![0,1,2,3,4,5,6,7,8,9];
        let mut r = split_before(generate_okok_iterator(v), |x|{Ok(x%3==0)}, 2);
        assert_eq!(Some(Ok(Vec::<i32>::new())), r.next());
        assert_eq!(Some(Ok(vec![0,1,2])), r.next());
        assert_eq!(Some(Ok(vec![3,4,5,6,7,8,9])), r.next());
        assert_eq!(None, r.next());
        assert_eq!(None, r.next());

        let v = vec![0,0,0];
        let mut r = split_before(generate_okok_iterator(v), |x|{Ok(x%3==0)}, -1);
        assert_eq!(Some(Ok(Vec::<i32>::new())), r.next());
        assert_eq!(Some(Ok(vec![0])), r.next());
        assert_eq!(Some(Ok(vec![0])), r.next());
        assert_eq!(Some(Ok(vec![0])), r.next());
        assert_eq!(None, r.next());
        assert_eq!(None, r.next());

        let v = vec![1,1,1];
        let mut r = split_before(generate_okok_iterator(v), |x|{Ok(x%3==0)}, -1);
        assert_eq!(Some(Ok(vec![1,1,1])), r.next());
        assert_eq!(None, r.next());
        assert_eq!(None, r.next());

        let v = vec![1,1,1];
        let mut r = split_before(generate_okok_iterator(v), |x|{Ok(x%3==0)}, 2);
        assert_eq!(Some(Ok(vec![1,1,1])), r.next());
        assert_eq!(None, r.next());
        assert_eq!(None, r.next());
    }
}