public MinAndMax(IntegerBitWidth bitWidth, bool isSigned)
{
Mask = BigInteger.Pow(2, (int)bitWidth) - 1;
if (isSigned)
{
var num = BigInteger.Pow(2, (int)bitWidth - 1);
Min = -num;
Max = num - 1;
}
else
{
Min = 0;
Max = Mask;
}
}
public static LimitedIntegerToken Parse(string value, IntegerBase numBase, IntegerBitWidth bitWidth, bool isSigned, bool isNeg, string rawToken, SourcePosition position, IConfiguration configuration)
{
BigInteger val;
switch (numBase)
{
case IntegerBase.Binary: val = value.Replace("b", "").Replace("B", "").BigIntegerFromBinary(); break;
case IntegerBase.Octal: val = value.Replace("o", "").Replace("O", "").BigIntegerFromOctal(); break;
case IntegerBase.Decimal: val = BigInteger.Parse(value, NumberStyles.Integer); break;
case IntegerBase.Hexadecimal: val = BigInteger.Parse(value.Replace("0x", "00").Replace("0X", "00"), NumberStyles.HexNumber); break;
default:
throw new ParseException($"Unhandled integer base {numBase}.");
}
return(new LimitedIntegerToken(val, bitWidth, isSigned, isNeg, $"{(isNeg ? "-" : "")}{rawToken}", position, configuration));
}
private LimitedIntegerToken(BigInteger typedValue, IntegerBitWidth bitWidth, bool isSigned, bool isNeg, string rawToken, SourcePosition position, IConfiguration configuration)
: base(LiteralTokenType.LimitedInteger, (isNeg ? typedValue * -1 : typedValue), rawToken, position)
{
if (isNeg)
{
typedValue *= -1;
}
SignAndBitWidth = new BitWidthAndSignPair(bitWidth, isSigned);
_minAndMax = MinAndMaxMap.Instance[SignAndBitWidth];
if (!(configuration?.IgnoreLimitedIntegerMaxMinRange ?? false))
{
if (typedValue < _minAndMax.Min)
{
throw new ParseException($"{typedValue} is less than the minimum of {_minAndMax.Min} for a {bitWidth.GetEnumDescription()}-bit {(isSigned ? "signed" : "unsigned")} {nameof(LimitedIntegerToken)} ");
}
else if (typedValue > _minAndMax.Max)
{
throw new ParseException($"{typedValue} is greater than the maximum of {_minAndMax.Max} for a {bitWidth.GetEnumDescription()}-bit {(isSigned ? "signed" : "unsigned")} {nameof(LimitedIntegerToken)} ");
}
}
}
public BitWidthAndSignPair(IntegerBitWidth bitWidth, bool isSigned = true)
{
BitWidth = bitWidth;
IsSigned = isSigned;
}
