pub fn f32<Input, Error>(endian: Endianness) -> impl Parser<Input, f32, Error>
Expand description
Recognizes a 4 byte floating point number
If the parameter is winnow::binary::Endianness::Big
, parse a big endian f32 float,
otherwise if winnow::binary::Endianness::Little
parse a little endian f32 float.
Complete version: returns an error if there is not enough input data
[Partial version][crate::_topic::partial]: Will return Err(winnow::error::ErrMode::Incomplete(_))
if there is not enough data.
§Example
use winnow::binary::f32;
let be_f32 = |s| {
f32(winnow::binary::Endianness::Big).parse_peek(s)
};
assert_eq!(be_f32(&[0x41, 0x48, 0x00, 0x00][..]), Ok((&b""[..], 12.5)));
assert_eq!(be_f32(&b"abc"[..]), Err(ErrMode::Backtrack(InputError::new(&b"abc"[..], ErrorKind::Slice))));
let le_f32 = |s| {
f32(winnow::binary::Endianness::Little).parse_peek(s)
};
assert_eq!(le_f32(&[0x00, 0x00, 0x48, 0x41][..]), Ok((&b""[..], 12.5)));
assert_eq!(le_f32(&b"abc"[..]), Err(ErrMode::Backtrack(InputError::new(&b"abc"[..], ErrorKind::Slice))));
use winnow::binary::f32;
let be_f32 = |s| {
f32::<_, InputError<_>>(winnow::binary::Endianness::Big).parse_peek(s)
};
assert_eq!(be_f32(Partial::new(&[0x41, 0x48, 0x00, 0x00][..])), Ok((Partial::new(&b""[..]), 12.5)));
assert_eq!(be_f32(Partial::new(&b"abc"[..])), Err(ErrMode::Incomplete(Needed::new(1))));
let le_f32 = |s| {
f32::<_, InputError<_>>(winnow::binary::Endianness::Little).parse_peek(s)
};
assert_eq!(le_f32(Partial::new(&[0x00, 0x00, 0x48, 0x41][..])), Ok((Partial::new(&b""[..]), 12.5)));
assert_eq!(le_f32(Partial::new(&b"abc"[..])), Err(ErrMode::Incomplete(Needed::new(1))));