pub fn many_till<I, O, P, E, F, G>(
f: F,
g: G,
) -> impl FnMut(I) -> IResult<I, (Vec<O>, P), E>
Expand description
Applies the parser f
until the parser g
produces a result.
Returns a tuple of the results of f
in a Vec
and the result of g
.
f
keeps going so long as g
produces Err::Error
. To instead chain an error up, see cut
.
use nom::multi::many_till;
use nom::bytes::complete::tag;
fn parser(s: &str) -> IResult<&str, (Vec<&str>, &str)> {
many_till(tag("abc"), tag("end"))(s)
};
assert_eq!(parser("abcabcend"), Ok(("", (vec!["abc", "abc"], "end"))));
assert_eq!(parser("abc123end"), Err(Err::Error(Error::new("123end", ErrorKind::Tag))));
assert_eq!(parser("123123end"), Err(Err::Error(Error::new("123123end", ErrorKind::Tag))));
assert_eq!(parser(""), Err(Err::Error(Error::new("", ErrorKind::Tag))));
assert_eq!(parser("abcendefg"), Ok(("efg", (vec!["abc"], "end"))));