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Allow "infinity" and ignore case when parsing floats. #48886

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Allow "infinity" and ignore case when parsing floats. #48886

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18 changes: 13 additions & 5 deletions src/libcore/num/dec2flt/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -123,7 +123,8 @@ macro_rules! from_str_float_impl {
/// * '2.5E-10'
/// * '5.'
/// * '.5', or, equivalently, '0.5'
/// * 'inf', '-inf', 'NaN'
/// * 'inf', `-inf`, or equivalently 'infinity', `-infinity` (case-insensitive)
/// * 'NaN' (case-insensitive)
///
/// Leading and trailing whitespace represent an error.
///
Expand Down Expand Up @@ -215,10 +216,17 @@ fn dec2flt<T: RawFloat>(s: &str) -> Result<T, ParseFloatError> {
ParseResult::Valid(decimal) => convert(decimal)?,
ParseResult::ShortcutToInf => T::INFINITY,
ParseResult::ShortcutToZero => T::ZERO,
ParseResult::Invalid => match s {
"inf" => T::INFINITY,
"NaN" => T::NAN,
_ => { return Err(pfe_invalid()); }
ParseResult::Invalid => {
let buf = [0; 8]
.get_mut(..s.len())
.ok_or_else(pfe_invalid)?;
buf.copy_from_slice(s.as_bytes());
buf.make_ascii_uppercase();
match &*buf {
b"INFINITY" | b"INF" => T::INFINITY,
b"NAN" => T::NAN,
_ => { return Err(pfe_invalid()); }
}
}
};

Expand Down
14 changes: 11 additions & 3 deletions src/libcore/tests/num/dec2flt/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -122,15 +122,23 @@ fn whitespace() {
#[test]
fn nan() {
assert!("NaN".parse::<f32>().unwrap().is_nan());
assert!("NAN".parse::<f32>().unwrap().is_nan());
assert!("nan".parse::<f32>().unwrap().is_nan());
assert!("NaN".parse::<f64>().unwrap().is_nan());
assert!("NAN".parse::<f64>().unwrap().is_nan());
assert!("nan".parse::<f64>().unwrap().is_nan());
}

#[test]
fn inf() {
assert_eq!("inf".parse(), Ok(f64::INFINITY));
assert_eq!("-inf".parse(), Ok(f64::NEG_INFINITY));
assert_eq!("inf".parse(), Ok(f32::INFINITY));
assert_eq!("INF".parse(), Ok(f32::INFINITY));
assert_eq!("-inf".parse(), Ok(f32::NEG_INFINITY));
assert_eq!("INFINITy".parse(), Ok(f32::INFINITY));
assert_eq!("-infinitY".parse(), Ok(f32::NEG_INFINITY));
assert_eq!("INF".parse(), Ok(f64::INFINITY));
assert_eq!("-inf".parse(), Ok(f64::NEG_INFINITY));
assert_eq!("INFINITy".parse(), Ok(f64::INFINITY));
assert_eq!("-infinitY".parse(), Ok(f64::NEG_INFINITY));
}

#[test]
Expand Down