pub fn take<C, Input, Error: ParseError<Input>>(
count: C
) -> impl Fn(Input) -> IResult<Input, Input, Error> where
Input: InputIter + InputTake + InputLength,
C: ToUsize, Expand description
Returns an input slice containing the first N input elements (Input[..N]).
Streaming Specific
Streaming version if the input has less than N elements, take will
return a Err::Incomplete(Needed::new(M)) where M is the number of
additional bytes the parser would need to succeed.
It is well defined for &[u8] as the number of elements is the byte size,
but for types like &str, we cannot know how many bytes correspond for
the next few chars, so the result will be Err::Incomplete(Needed::Unknown)
Example
use nom::bytes::streaming::take;
fn take6(s: &str) -> IResult<&str, &str> {
take(6usize)(s)
}
assert_eq!(take6("1234567"), Ok(("7", "123456")));
assert_eq!(take6("things"), Ok(("", "things")));
assert_eq!(take6("short"), Err(Err::Incomplete(Needed::Unknown)));