Function winnow::bytes::one_of

pub fn one_of<I, T, Error: ParseError<I>>(
    list: T
) -> impl FnMut(I) -> IResult<I, <I as Stream>::Token, Error>where
    I: StreamIsPartial + Stream,
    <I as Stream>::Token: Copy,
    T: ContainsToken<<I as Stream>::Token>,

Recognize a token that matches the pattern

Note: Parser is implemented as a convenience (complete only) for

• u8
• char

Complete version: Will return an error if there’s not enough input data.

Partial version: Will return Err(winnow::error::ErrMode::Incomplete(_)) if there’s not enough input data.

Example

assert_eq!(one_of::<_, _, Error<_>>("abc")("b"), Ok(("", 'b')));
assert_eq!(one_of::<_, _, Error<_>>("a")("bc"), Err(ErrMode::Backtrack(Error::new("bc", ErrorKind::OneOf))));
assert_eq!(one_of::<_, _, Error<_>>("a")(""), Err(ErrMode::Backtrack(Error::new("", ErrorKind::OneOf))));

fn parser_fn(i: &str) -> IResult<&str, char> {
    one_of(|c| c == 'a' || c == 'b')(i)
}
assert_eq!(parser_fn("abc"), Ok(("bc", 'a')));
assert_eq!(parser_fn("cd"), Err(ErrMode::Backtrack(Error::new("cd", ErrorKind::OneOf))));
assert_eq!(parser_fn(""), Err(ErrMode::Backtrack(Error::new("", ErrorKind::OneOf))));

assert_eq!(one_of::<_, _, Error<_>>("abc")(Partial::new("b")), Ok((Partial::new(""), 'b')));
assert_eq!(one_of::<_, _, Error<_>>("a")(Partial::new("bc")), Err(ErrMode::Backtrack(Error::new(Partial::new("bc"), ErrorKind::OneOf))));
assert_eq!(one_of::<_, _, Error<_>>("a")(Partial::new("")), Err(ErrMode::Incomplete(Needed::new(1))));

fn parser_fn(i: Partial<&str>) -> IResult<Partial<&str>, char> {
    one_of(|c| c == 'a' || c == 'b')(i)
}
assert_eq!(parser_fn(Partial::new("abc")), Ok((Partial::new("bc"), 'a')));
assert_eq!(parser_fn(Partial::new("cd")), Err(ErrMode::Backtrack(Error::new(Partial::new("cd"), ErrorKind::OneOf))));
assert_eq!(parser_fn(Partial::new("")), Err(ErrMode::Incomplete(Needed::new(1))));