Function gchemol_parser::parsers::streaming::take

pub fn take<C, Input, Error>(count: C) -> impl Fn(Input) where
    C: ToUsize,
    Error: ParseError<Input>,
    Input: InputIter + InputTake, 

Returns an input slice containing the first N input elements (Input[..N])

Streaming Specific

Streaming version will return a Err::Incomplete(Needed::Size(N)) where N is the argument if the input is less than the length provided

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::Size(6)))); //N doesn't change
assert_eq!(take6(""), Err(Err::Incomplete(Needed::Size(6))));