Function winnow::combinator::fill

pub fn fill<'a, I, O, E, F>(
    f: F,
    buf: &'a mut [O],
) -> impl Parser<I, (), E> + 'a
where
    I: Stream + 'a,
    F: Parser<I, O, E> + 'a,
    E: ParserError<I> + 'a,

Repeats the embedded parser, 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

Example

use winnow::combinator::fill;
use winnow::token::tag;

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

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