private ConstantWrapper BitwiseXor(ConstantWrapper left, ConstantWrapper right)
{
ConstantWrapper newLiteral = null;
if (m_parser.Settings.IsModificationAllowed(TreeModifications.EvaluateNumericExpressions))
{
try
{
Int32 lValue = left.ToInt32();
Int32 rValue = right.ToInt32();
newLiteral = new ConstantWrapper(Convert.ToDouble(lValue ^ rValue), PrimitiveType.Number, null, m_parser);
}
catch (InvalidCastException)
{
// some kind of casting in ToNumber caused a situation where we don't want
// to perform the combination on these operands
}
}
return newLiteral;
}
private ConstantWrapper RightShift(ConstantWrapper left, ConstantWrapper right)
{
ConstantWrapper newLiteral = null;
if (m_parser.Settings.IsModificationAllowed(TreeModifications.EvaluateNumericExpressions))
{
try
{
// left-hand value is a 32-bit signed integer
Int32 lvalue = left.ToInt32();
// mask only the bottom 5 bits of the right-hand value
int rvalue = (int)(right.ToUInt32() & 0x1F);
// convert the result to a double
double result = Convert.ToDouble(lvalue >> rvalue);
newLiteral = new ConstantWrapper(result, PrimitiveType.Number, null, m_parser);
}
catch (InvalidCastException)
{
// some kind of casting in ToNumber caused a situation where we don't want
// to perform the combination on these operands
}
}
return newLiteral;
}
