string IFormattable.ToString(string format, IFormatProvider formatProvider)
{
string elementFormat = format;
var spec = FormatParser.FirstSpecifierOrDefault(ref format, 'W', -1);
if (char.ToUpperInvariant(spec.Item1) == 'W')
{
return(ToString(
spec.Item2 == -1 ? DefaultElementWidth : spec.Item2,
format,
formatProvider));
}
else
{
return(ToString(DefaultElementWidth, elementFormat, formatProvider));
}
}
public string ToString(string format, IFormatProvider formatProvider)
{
string numberFormat = format;
var spec = FormatParser.FirstSpecifierOrDefault(ref format, 'S', -1);
if (char.ToUpperInvariant(spec.Item1) == 'S') // or format == null
{
StringBuilder result = new StringBuilder();
bool outputReal = Re != 0;
bool outputImaginary = Im != 0;
if (outputReal)
{
result.Append(
format != null
? Re.ToString(format)
: Re.ToString());
}
if (outputImaginary)
{
if (Im < 0)
{
result.Append("-");
}
else if (outputReal)
{
result.Append("+");
}
var imaginaryModulus = Math.Abs(Im);
if (imaginaryModulus != 1)
{
result.Append(
format != null
? imaginaryModulus.ToString(format)
: imaginaryModulus.ToString());
}
result.Append("i");
}
if (!outputReal && !outputImaginary)
{
result.Append("0");
}
return(result.ToString());
}
else
{
string real = Re.ToString(numberFormat, formatProvider);
string imaginary = Math.Abs(Im).ToString(numberFormat, formatProvider);
return(string.Format("{0}{1}{2}i",
real,
Im >= 0 ? "+" : "-",
imaginary));
}
}
