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use fmt::{Formatter, Result, LowerExp, UpperExp, Display, Debug};
use num::flt2dec;
fn float_to_decimal_common<T>(fmt: &mut Formatter, num: &T, negative_zero: bool) -> Result
where T: flt2dec::DecodableFloat
{
let force_sign = fmt.sign_plus();
let sign = match (force_sign, negative_zero) {
(false, false) => flt2dec::Sign::Minus,
(false, true) => flt2dec::Sign::MinusRaw,
(true, false) => flt2dec::Sign::MinusPlus,
(true, true) => flt2dec::Sign::MinusPlusRaw,
};
let mut buf = [0; 1024];
let mut parts = [flt2dec::Part::Zero(0); 16];
let formatted = if let Some(precision) = fmt.precision {
flt2dec::to_exact_fixed_str(flt2dec::strategy::grisu::format_exact, *num, sign,
precision, false, &mut buf, &mut parts)
} else {
flt2dec::to_shortest_str(flt2dec::strategy::grisu::format_shortest, *num, sign,
0, false, &mut buf, &mut parts)
};
fmt.pad_formatted_parts(&formatted)
}
fn float_to_exponential_common<T>(fmt: &mut Formatter, num: &T, upper: bool) -> Result
where T: flt2dec::DecodableFloat
{
let force_sign = fmt.sign_plus();
let sign = match force_sign {
false => flt2dec::Sign::Minus,
true => flt2dec::Sign::MinusPlus,
};
let mut buf = [0; 1024];
let mut parts = [flt2dec::Part::Zero(0); 16];
let formatted = if let Some(precision) = fmt.precision {
flt2dec::to_exact_exp_str(flt2dec::strategy::grisu::format_exact, *num, sign,
precision + 1, upper, &mut buf, &mut parts)
} else {
flt2dec::to_shortest_exp_str(flt2dec::strategy::grisu::format_shortest, *num, sign,
(0, 0), upper, &mut buf, &mut parts)
};
fmt.pad_formatted_parts(&formatted)
}
macro_rules! floating {
($ty:ident) => (
#[stable(feature = "rust1", since = "1.0.0")]
impl Debug for $ty {
fn fmt(&self, fmt: &mut Formatter) -> Result {
float_to_decimal_common(fmt, self, true)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl Display for $ty {
fn fmt(&self, fmt: &mut Formatter) -> Result {
float_to_decimal_common(fmt, self, false)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl LowerExp for $ty {
fn fmt(&self, fmt: &mut Formatter) -> Result {
float_to_exponential_common(fmt, self, false)
}
}
#[stable(feature = "rust1", since = "1.0.0")]
impl UpperExp for $ty {
fn fmt(&self, fmt: &mut Formatter) -> Result {
float_to_exponential_common(fmt, self, true)
}
}
)
}
floating! { f32 }
floating! { f64 }