split_with_matches.rs

split_with_matches.rs

fn split_with_matches<'a, F>(s: &'a str, f: F) -> Vec<&'a str>
where
    F: Fn(char) -> bool,
{
    let mut out: Vec<&'a str> = Vec::new();
    let mut prevpos: usize = 0;

    for (pos, c) in s.bytes().enumerate() {
        if f(c as char) {
            if prevpos != pos {
                out.push(&s[prevpos..pos]);
            }
            out.push(&s[pos..pos + 1]);
            prevpos = pos + 1;
        }
    }
    if prevpos != s.len() {
        out.push(&s[prevpos..]);
    }
    out
}