rocket::mtls::x509::der_parser::asn1_rs::nom::bytes::streaming

Function take_while

Source 
pub fn take_while<F, Input, Error>(cond: F) -> impl Fn(Input)
where
    Error: ParseError<Input>,
    Input: InputTakeAtPosition,
    F: Fn(<Input as InputTakeAtPosition>::Item) -> bool,
Available on crate feature mtls only.
Expand description

Returns the longest input slice (if any) that matches the predicate.

The parser will return the longest slice that matches the given predicate (a function that takes the input and returns a bool).

§Streaming Specific

Streaming version will return a Err::Incomplete(Needed::new(1)) if the pattern reaches the end of the input.

§Example

use nom::bytes::streaming::take_while;
use nom::character::is_alphabetic;

fn alpha(s: &[u8]) -> IResult<&[u8], &[u8]> {
  take_while(is_alphabetic)(s)
}

assert_eq!(alpha(b"latin123"), Ok((&b"123"[..], &b"latin"[..])));
assert_eq!(alpha(b"12345"), Ok((&b"12345"[..], &b""[..])));
assert_eq!(alpha(b"latin"), Err(Err::Incomplete(Needed::new(1))));
assert_eq!(alpha(b""), Err(Err::Incomplete(Needed::new(1))));