private static ResultValue Add(ResultValue left, ResultValue right)
{
if (ResultValue.HasNullResult(left, right))
{
return ResultNullValue.Instance;
}
if ((left is ResultNumberValue) && (right is ResultNumberValue))
{
decimal result = ((ResultNumberValue)left).Value + ((ResultNumberValue)right).Value;
return new ResultNumberValue(result);
}
else if ((left is ResultDateValue) && (right is ResultNumberValue))
{
DateTime result = ((ResultDateValue)left).Value.AddDays(Decimal.ToDouble(((ResultNumberValue)right).Value));
return new ResultDateValue(result);
}
else if ((left is ResultStringValue))
{
string result = ((ResultStringValue)left).Value + right.StrValue();
return new ResultStringValue(result);
}
else
{
throw new LaxerCalculateException();
}
}
private static ResultValue And(ResultValue left, ResultValue right)
{
if (ResultValue.HasNullResult(left, right))
{
return ResultNullValue.Instance;
}
if ((left is ResultBoolValue) && (right is ResultBoolValue))
{
bool result = ((ResultBoolValue)left).Value && ((ResultBoolValue)right).Value;
return new ResultBoolValue(result);
}
else
{
throw new LaxerCalculateException();
}
}
private static ResultValue XorAndPower(ResultValue left, ResultValue right)
{
if (ResultValue.HasNullResult(left, right))
{
return ResultNullValue.Instance;
}
if ((left is ResultNumberValue) && (right is ResultNumberValue))
{
double result = Math.Pow(Decimal.ToDouble(((ResultNumberValue)left).Value), Decimal.ToDouble(((ResultNumberValue)right).Value));
return new ResultNumberValue(new decimal(result));
}
else if ((left is ResultBoolValue) && (right is ResultBoolValue))
{
bool result = ((ResultBoolValue)left).Value ^ ((ResultBoolValue)right).Value;
return new ResultBoolValue(result);
}
else
{
throw new LaxerCalculateException();
}
}
private static ResultValue Remainder(ResultValue left, ResultValue right)
{
if (ResultValue.HasNullResult(left, right))
{
return ResultNullValue.Instance;
}
if ((left is ResultNumberValue) && (right is ResultNumberValue))
{
decimal result = ((ResultNumberValue)left).Value % ((ResultNumberValue)right).Value;
return new ResultNumberValue(result);
}
else
{
throw new LaxerCalculateException();
}
}
private static ResultValue NotEqual(ResultValue left, ResultValue right)
{
if (ResultValue.HasNullResult(left, right))
{
return ResultNullValue.Instance;
}
if (left.GetType().Equals(right.GetType()))
{
bool result = left.ComparaValue().CompareTo(right.ComparaValue()) != 0;
return new ResultBoolValue(result);
}
else
{
throw new LaxerCalculateException();
}
}
private static ResultValue Multiply(ResultValue left, ResultValue right)
{
if (ResultValue.HasNullResult(left, right))
{
return ResultNullValue.Instance;
}
if ((left is ResultNumberValue) && (right is ResultNumberValue))
{
decimal result = ((ResultNumberValue)left).Value * ((ResultNumberValue)right).Value;
return new ResultNumberValue(result);
}
else if ((left is ResultStringValue) && (right is ResultNumberValue))
{
StringBuilder sb = new StringBuilder();
string baseString = ((ResultStringValue)left).Value;
int loopCount = Decimal.ToInt32(((ResultNumberValue)right).Value);
for (int i = 0; i < loopCount; i++)
{
sb.Append(baseString);
}
return new ResultStringValue(sb.ToString());
}
else
{
throw new LaxerCalculateException();
}
}
