Implement more formatting options for Complex

This commit is contained in:
Sigurd Kolltveit 2017-03-18 15:50:39 +01:00
parent 6113192e04
commit e2759e0321
1 changed files with 86 additions and 21 deletions

View File

@ -617,13 +617,58 @@ impl<T: Clone + Num> One for Complex<T> {
}
macro_rules! write_complex {
($f:ident, $re_fmt:expr, $im_fmt:expr, $re:expr, $im:expr, $( $arg:expr ),*) => {
if $im < Zero::zero() {
write!($f, concat!($re_fmt, "-", $im_fmt), $re, T::zero() - $im.clone(), $( $arg, )*)
($f:ident, $t:expr, $prefix:expr, $re:expr, $im:expr, $T:ident) => {{
let zero: $T = Zero::zero();
let abs_re = if $re < Zero::zero() { zero.clone() - $re.clone() } else { $re.clone() };
let abs_im = if $im < Zero::zero() { zero.clone() - $im.clone() } else { $im.clone() };
let mut real: String;
let mut imag: String;
if let Some(prec) = $f.precision() {
real = format!(concat!("{:.1$", $t, "}"), abs_re, prec);
imag = format!(concat!("{:.1$", $t, "}"), abs_im, prec);
}
else {
real = format!(concat!("{:", $t, "}"), abs_re);
imag = format!(concat!("{:", $t, "}"), abs_im);
}
let prefix = if $f.alternate() { $prefix } else { "" };
let sign = if $re < Zero::zero() {
"-"
} else if $f.sign_plus() {
"+"
} else {
write!($f, concat!($re_fmt, "+", $im_fmt), $re, $im, $( $arg, )*)
""
};
if $f.sign_aware_zero_pad() && $f.width().is_some() {
let total_width = $f.width().unwrap();
// Subtract leading sign, two prefixes, middle operator and trailing 'i'
// to obtain the width scalars need to be padded to
let subtract = sign.len() + prefix.len()*2 + 1 + 1;
let scalar_width = total_width - subtract;
let real_width = scalar_width - (scalar_width/2);
let imag_width = scalar_width/2;
real = format!("{0:0>1$}", real, real_width);
imag = format!("{0:0>1$}", imag, imag_width);
}
let complex = if $im < Zero::zero() {
format!("{}{pre}{re}-{pre}{im}i", sign, re=real, im=imag, pre=prefix)
}
else {
format!("{}{pre}{re}+{pre}{im}i", sign, re=real, im=imag, pre=prefix)
};
if let Some(width) = $f.width() {
write!($f, "{0: >1$}", complex, width)
}
else {
write!($f, "{}", complex)
}
}}
}
/* string conversions */
@ -631,11 +676,7 @@ impl<T> fmt::Display for Complex<T> where
T: fmt::Display + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if let Some(precision) = f.precision() {
write_complex!(f, "{0:.2$}", "{1:.2$}i", self.re, self.im, precision)
} else {
write_complex!(f, "{0}", "{1}i", self.re, self.im,)
}
write_complex!(f, "", "", self.re, self.im, T)
}
}
@ -643,11 +684,7 @@ impl<T> fmt::LowerExp for Complex<T> where
T: fmt::LowerExp + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if let Some(precision) = f.precision() {
write_complex!(f, "{0:.2$e}", "{1:.2$e}i", self.re, self.im, precision)
} else {
write_complex!(f, "{0:e}", "{1:e}i", self.re, self.im,)
}
write_complex!(f, "e", "", self.re, self.im, T)
}
}
@ -655,12 +692,40 @@ impl<T> fmt::UpperExp for Complex<T> where
T: fmt::UpperExp + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
if let Some(precision) = f.precision() {
write_complex!(f, "{0:.2$E}", "{1:.2$E}i", self.re, self.im, precision)
} else {
write_complex!(f, "{0:E}", "{1:E}i", self.re, self.im,)
write_complex!(f, "E", "", self.re, self.im, T)
}
}
impl<T> fmt::LowerHex for Complex<T> where
T: fmt::LowerHex + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write_complex!(f, "x", "0x", self.re, self.im, T)
}
}
impl<T> fmt::UpperHex for Complex<T> where
T: fmt::UpperHex + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write_complex!(f, "X", "0x", self.re, self.im, T)
}
}
impl<T> fmt::Octal for Complex<T> where
T: fmt::Octal + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write_complex!(f, "o", "0o", self.re, self.im, T)
}
}
impl<T> fmt::Binary for Complex<T> where
T: fmt::Binary + Num + PartialOrd + Clone
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write_complex!(f, "b", "0b", self.re, self.im, T)
}
}
#[cfg(feature = "serde")]