Function winnow::multi::count

pub fn count<I, O, C, E, F>(
    f: F,
    count: usize
) -> impl FnMut(I) -> IResult<I, C, E>where
    I: Stream,
    C: Accumulate<O>,
    F: Parser<I, O, E>,
    E: ParseError<I>,

Accumulate the output of a parser into a container, like Vec

Arguments

• f The parser to apply.
• count How often to apply the parser.

To recognize a series of tokens, Accumulate into a () and then Parser::recognize.

Example

use winnow::multi::count;
use winnow::bytes::tag;

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

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