# Function nom::character::streaming::satisfy

source · [−]

    pub fn satisfy<F, I, Error: ParseError<I>>(
        cond: F
    ) -> impl Fn(I) -> IResult<I, char, Error> where
        I: Slice<RangeFrom<usize>> + InputIter,
        <I as InputIter>::Item: AsChar,
        F: Fn(char) -> bool,

Expand description

Recognizes one character and checks that it satisfies a predicate

Streaming version: Will return `Err(nom::Err::Incomplete(_))` if there’s not enough input data.

## Example

    fn parser(i: &str) -> IResult<&str, char> {
        satisfy(|c| c == 'a' || c == 'b')(i)
    }
    assert_eq!(parser("abc"), Ok(("bc", 'a')));
    assert_eq!(parser("cd"), Err(Err::Error(Error::new("cd", ErrorKind::Satisfy))));
    assert_eq!(parser(""), Err(Err::Incomplete(Needed::Unknown)));