private static bool TryReadHatPower(string text, ref int pos, out int power)
{
if (text[pos] != '^')
{
// leaving this even if it is a try method. Getting here means something should have been checked before
throw new InvalidOperationException("Check that there is a hat power to read before calling this");
}
pos++;
WhiteSpaceReader.TryRead(text, ref pos);
var ps = OperatorReader.TryReadSign(text, ref pos);
if (ps == Sign.None)
{
ps = Sign.Positive;
}
if (OperatorReader.TryReadSign(text, ref pos) != Sign.None)
{
// not allowing a^--2 as it is most likely a typo
power = 0;
return(false);
}
WhiteSpaceReader.TryRead(text, ref pos);
if (IntReader.TryReadInt32(text, ref pos, out power))
{
power *= (int)ps;
return(true);
}
power = 0;
return(false);
}
private static bool TrySkipIntegerDigits(string text, ref int pos, NumberStyles styles, NumberFormatInfo format)
{
if (pos == text.Length)
{
return(false);
}
var start = pos;
if (format?.NumberDecimalSeparator != null &&
Skipper.TrySkip(text, ref pos, format.NumberDecimalSeparator))
{
if (!IntReader.IsDigit(text, pos))
{
pos = start;
return(false);
}
pos = start;
return(true);
}
if (!IntReader.IsDigit(text[pos]))
{
return(false);
}
while (pos < text.Length)
{
var i = text[pos] - '0';
if (i >= 0 && i <= 9)
{
pos++;
continue;
}
if ((styles & NumberStyles.AllowThousands) != 0)
{
if (format?.NumberDecimalSeparator != null &&
Skipper.TrySkip(text, ref pos, format.NumberGroupSeparator))
{
continue;
}
}
break;
}
return(pos - start < 310);
}
private static bool TrySkipExponentDigits(string text, ref int pos)
{
return(IntReader.TrySkipDigits(text, ref pos));
}
// ReSharper disable once UnusedMethodReturnValue.Local
private static bool TrySkipFractionDigits(string text, ref int pos)
{
return(IntReader.TrySkipDigits(text, ref pos));
}