/// <summary>
/// Evalaute this node and return result.
/// </summary>
/// <param name="thisObject">Reference to object that is exposed as 'this'.</param>
/// <returns>Result value and type of that result.</returns>
public override EvalResult Evaluate(object thisObject)
{
// Get the result from evaluating both children
EvalResult left = this[0].Evaluate(thisObject);
EvalResult right = this[1].Evaluate(thisObject);
int count;
if (_language == Language.CSharp)
{
// The shift count is always an Int32, so convert anything smaller to an Int32
switch (right.Type)
{
case TypeCode.Char:
count = (Int32)(Char)right.Value;
break;
case TypeCode.Byte:
count = (Int32)(Byte)right.Value;
break;
case TypeCode.SByte:
count = (Int32)(SByte)right.Value;
break;
case TypeCode.UInt16:
count = (Int32)(UInt16)right.Value;
break;
case TypeCode.Int16:
count = (Int32)(Int16)right.Value;
break;
case TypeCode.Int32:
count = (Int32)right.Value;
break;
default:
throw new ApplicationException("Shift operation '" + OperationString + "' cannot convert the shift count from type '" + right.Type.ToString() + "' to 'Int32'.");
}
}
else
{
if (ImplicitConverter.CanConvertToInt32(right.Value, Language.VBNet))
{
count = ImplicitConverter.ConvertToInt32(right.Value, Language.VBNet);
}
else
{
throw new ApplicationException("Shift operation '" + OperationString + "' cannot convert the shift count to a 'Int32' value.");
}
}
// Perform the actual shift operation
switch (left.Type)
{
case TypeCode.Byte:
return(EvalShiftOp((Int32)(Byte)left.Value, count));
case TypeCode.SByte:
return(EvalShiftOp((Int32)(SByte)left.Value, count));
case TypeCode.Char:
if (_language == Language.CSharp)
{
return(EvalShiftOp((Int32)(Char)left.Value, count));
}
break;
case TypeCode.UInt16:
return(EvalShiftOp((Int32)(UInt16)left.Value, count));
case TypeCode.Int16:
return(EvalShiftOp((Int32)(Int16)left.Value, count));
case TypeCode.Int32:
return(EvalShiftOp((Int32)(Int32)left.Value, count));
case TypeCode.UInt32:
return(EvalShiftOp((UInt32)left.Value, count));
case TypeCode.Int64:
return(EvalShiftOp((Int64)left.Value, count));
case TypeCode.UInt64:
return(EvalShiftOp((UInt64)left.Value, count));
case TypeCode.Boolean:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int16)ImplicitConverter.ConvertToInt16(left.Value, Language.VBNet), count));
}
break;
case TypeCode.Single:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int64)(Single)left.Value, count));
}
break;
case TypeCode.Double:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int64)(Double)left.Value, count));
}
break;
case TypeCode.Decimal:
if (_language == Language.VBNet)
{
return(EvalShiftOp((Int64)(Decimal)left.Value, count));
}
break;
}
throw new ApplicationException("Shift operation '" + OperationString + "' cannot shift type '" + left.Type.ToString() + "'.");
}