nom::number::streaming

Function float

Source 
pub fn float<T, E: ParseError<T>>(input: T) -> IResult<T, f32, E>
where
    T: Slice<RangeFrom<usize>> + Slice<RangeTo<usize>> + Clone + Offset + InputIter + InputLength + InputTake + ParseTo<f32> + Compare<&'static str> + InputTakeAtPosition + AsBytes + for<'a> Compare<&'a [u8]>,
    <T as InputIter>::Item: AsChar,
    <T as InputIter>::IterElem: Clone,
    <T as InputTakeAtPosition>::Item: AsChar,
Expand description

Recognizes floating point number in text format and returns a f32.

Streaming version: Will return Err(nom::Err::Incomplete(_)) if there is not enough data.

use nom::number::complete::float;

let parser = |s| {
  float(s)
};

assert_eq!(parser("11e-1"), Ok(("", 1.1)));
assert_eq!(parser("123E-02"), Ok(("", 1.23)));
assert_eq!(parser("123K-01"), Ok(("K-01", 123.0)));
assert_eq!(parser("abc"), Err(Err::Error(("abc", ErrorKind::Float))));