private static Boolean TryParse(ReadOnlySpan <char> s, NumberStyles style, NumberFormatInfo info, out Single result)
{
bool success = Number.TryParseSingle(s, style, info, out result);
if (!success)
{
ReadOnlySpan <char> sTrim = s.Trim();
if (StringSpanHelpers.Equals(sTrim, info.PositiveInfinitySymbol))
{
result = PositiveInfinity;
}
else if (StringSpanHelpers.Equals(sTrim, info.NegativeInfinitySymbol))
{
result = NegativeInfinity;
}
else if (StringSpanHelpers.Equals(sTrim, info.NaNSymbol))
{
result = NaN;
}
else
{
return(false); // We really failed
}
}
return(true);
}
internal unsafe static double ParseDouble(ReadOnlySpan <char> value, NumberStyles options, NumberFormatInfo numfmt)
{
NumberBuffer number = default;
double d = 0;
if (!TryStringToNumber(value, options, ref number, numfmt, false))
{
//If we failed TryStringToNumber, it may be from one of our special strings.
//Check the three with which we're concerned and rethrow if it's not one of
//those strings.
ReadOnlySpan <char> sTrim = value.Trim();
if (StringSpanHelpers.Equals(sTrim, numfmt.PositiveInfinitySymbol))
{
return(double.PositiveInfinity);
}
if (StringSpanHelpers.Equals(sTrim, numfmt.NegativeInfinitySymbol))
{
return(double.NegativeInfinity);
}
if (StringSpanHelpers.Equals(sTrim, numfmt.NaNSymbol))
{
return(double.NaN);
}
throw new FormatException(SR.Format_InvalidString);
}
if (!NumberBufferToDouble(ref number, ref d))
{
throw new OverflowException(SR.Overflow_Double);
}
return(d);
}
public static bool TryParse(ReadOnlySpan <char> value, out bool result)
{
ReadOnlySpan <char> trueSpan = TrueLiteral.AsReadOnlySpan();
if (StringSpanHelpers.Equals(trueSpan, value, StringComparison.OrdinalIgnoreCase))
{
result = true;
return(true);
}
ReadOnlySpan <char> falseSpan = FalseLiteral.AsReadOnlySpan();
if (StringSpanHelpers.Equals(falseSpan, value, StringComparison.OrdinalIgnoreCase))
{
result = false;
return(true);
}
// Special case: Trim whitespace as well as null characters.
value = TrimWhiteSpaceAndNull(value);
if (StringSpanHelpers.Equals(trueSpan, value, StringComparison.OrdinalIgnoreCase))
{
result = true;
return(true);
}
if (StringSpanHelpers.Equals(falseSpan, value, StringComparison.OrdinalIgnoreCase))
{
result = false;
return(true);
}
result = false;
return(false);
}