public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
if (a is double && b is double)
{
return((double)a + (double)b);
}
else if (a is DateTime && b is double)
{
return(((DateTime)a).AddDays((double)b));
}
else if (a is string || b is string)
{
return(string.Format("{0}{1}", a, b));
}
else
{
throw new Exceptions.UnexpectedTypeException(a.GetType());
}
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
else if (double.TryParse(a.ToString(), out double aNumber) && double.TryParse(b.ToString(), out double bNumber))
{
return(aNumber + bNumber);
}
else if (a is DateTime && double.TryParse(b.ToString(), out bNumber))
{
return(((DateTime)a).AddDays(bNumber));
}
else if (a is string || b is string)
{
return(string.Format("{0}{1}", a, b));
}
else
{
throw new Exceptions.UnexpectedTypeException(a.GetType());
}
}
public override object EvalValue(Func <string, object> context)
{
object value = Operand1.EvalValue(context);
if (value.ConvertToBoolean())
{
return(true);
}
else
{
value = Operand2.EvalValue(context);
return(value.ConvertToBoolean());
}
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
if (a is double && b is double)
{
return((double)a % (double)b);
}
else
{
throw new Exceptions.UnexpectedTypeException(a.GetType());
}
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
if (a is double && b is double)
{
return((double)a * (double)b);
}
else
{
throw new FormatException();
}
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
if (a is decimal && b is decimal)
{
return(Convert.ToDecimal(Math.Pow(Convert.ToDouble(a), Convert.ToDouble(b))));
}
else
{
throw new Exceptions.UnexpectedTypeException(a.GetType());
}
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
else if (a is decimal && b is decimal)
{
return((decimal)a - (decimal)b);
}
else if (a is DateTime && b is decimal)
{
return(((DateTime)a).AddDays(-1 * Convert.ToDouble(b)));
}
else
{
throw new UnexpectedTypeException(a.GetType());
}
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(false);
}
Type type = a.GetType();
if (type != b.GetType())
{
throw new Exceptions.UnexpectedTypeException(type, b.GetType());
}
int result = 0;
if (type == typeof(decimal))
{
result = Comparer <decimal> .Default.Compare((decimal)a, (decimal)b);
}
else if (type == typeof(DateTime))
{
result = Comparer <DateTime> .Default.Compare((DateTime)a, (DateTime)b);
}
else if (type == typeof(String))
{
result = Comparer <String> .Default.Compare((String)a, (String)b);
}
else if (type == typeof(bool))
{
result = Comparer <bool> .Default.Compare((bool)a, (bool)b);
}
else
{
throw new NotSupportedException();
}
return(interpret(result));
}
public override object EvalValue(Func <string, object> context)
{
object a = Operand1.EvalValue(context);
object b = Operand2.EvalValue(context);
if (a == null || b == null)
{
return(null);
}
else if (double.TryParse(a.ToString(), out double aNumber) && double.TryParse(b.ToString(), out double bNumber))
{
return(aNumber - bNumber);
}
else if (a is DateTime && b is double)
{
return(((DateTime)a).AddDays(-1 * Convert.ToDouble(b)));
}
else
{
throw new UnexpectedTypeException(a.GetType());
}
}