rocket::mtls::x509::der_parser::asn1_rs::nom::multi

Function many_m_n

Source 
pub fn many_m_n<I, O, E, F>(min: usize, max: usize, parse: F) -> impl FnMut(I)
where
    I: Clone + InputLength,
    F: Parser<I, O, E>,
    E: ParseError<I>,
Available on crate feature mtls only.
Expand description

Repeats the embedded parser m..=n times

This stops before n when the parser returns Err::Error and returns the results that were accumulated. To instead chain an error up, see cut.

ยงArguments

  • m The minimum number of iterations.
  • n The maximum number of iterations.
  • f The parser to apply.

Note: If the parser passed to many1 accepts empty inputs (like alpha0 or digit0), many1 will return an error, to prevent going into an infinite loop.

use nom::multi::many_m_n;
use nom::bytes::complete::tag;

fn parser(s: &str) -> IResult<&str, Vec<&str>> {
  many_m_n(0, 2, tag("abc"))(s)
}

assert_eq!(parser("abcabc"), Ok(("", vec!["abc", "abc"])));
assert_eq!(parser("abc123"), Ok(("123", vec!["abc"])));
assert_eq!(parser("123123"), Ok(("123123", vec![])));
assert_eq!(parser(""), Ok(("", vec![])));
assert_eq!(parser("abcabcabc"), Ok(("abc", vec!["abc", "abc"])));