Function fill

pub fn fill<'a, I, O, E, F>(
    f: F,
    buf: &'a mut [O],
) -> impl FnMut(I) -> IResult<I, (), E> + 'a
where
    I: Clone + PartialEq,
    F: Fn(I) -> IResult<I, O, E> + 'a,
    E: ParseError<I>,

Runs the embedded parser repeatedly, filling the given slice with results.

This parser fails if the input runs out before the given slice is full.

Arguments

• f The parser to apply.
• buf The slice to fill

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

fn parser(s: &str) -> IResult<&str, [&str; 2]> {
  let mut buf = ["", ""];
  let (rest, ()) = fill(tag("abc"), &mut buf)(s)?;
  Ok((rest, buf))
}

assert_eq!(parser("abcabc"), Ok(("", ["abc", "abc"])));
assert_eq!(parser("abc123"), Err(Err::Error(Error::new("123", ErrorKind::Tag))));
assert_eq!(parser("123123"), Err(Err::Error(Error::new("123123", ErrorKind::Tag))));
assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Tag))));
assert_eq!(parser("abcabcabc"), Ok(("abc", ["abc", "abc"])));