Function nom::multi::many0_count
source · pub fn many0_count<I, O, E, F>(f: F) -> impl FnMut(I) -> IResult<I, usize, E>where
I: Clone + InputLength,
F: Parser<I, O, E>,
E: ParseError<I>,
Expand description
Repeats the embedded parser, counting the results
This stops on Err::Error
. To instead chain an error up, see
cut
.
Arguments
f
The parser to apply.
Note: if the parser passed in accepts empty inputs (like alpha0
or digit0
), many0
will
return an error, to prevent going into an infinite loop
use nom::multi::many0_count;
use nom::bytes::complete::tag;
fn parser(s: &str) -> IResult<&str, usize> {
many0_count(tag("abc"))(s)
}
assert_eq!(parser("abcabc"), Ok(("", 2)));
assert_eq!(parser("abc123"), Ok(("123", 1)));
assert_eq!(parser("123123"), Ok(("123123", 0)));
assert_eq!(parser(""), Ok(("", 0)));