public override Value Execute(Args args, Environment environment, SourcePos pos)
{
var a = args.Get("a");
var b = args.Get("b");
if (a.IsNull() || b.IsNull())
{
return(ValueNull.NULL);
}
if (a.IsInt() && b.IsInt())
{
return(new ValueInt(a.AsInt().GetValue() + b.AsInt().GetValue()));
}
if (a.IsNumerical() && b.IsNumerical())
{
return(new ValueDecimal(a.AsDecimal().GetValue() + b.AsDecimal().GetValue()));
}
if (a.IsList())
{
if (b.IsCollection())
{
return(new ValueList(a.AsList().GetValue()).AddItems(b.AsList().GetValue()));
}
return(new ValueList(a.AsList().GetValue()).AddItem(b));
}
if (a.IsDate() && b.IsNumerical())
{
return(new ValueDate(a.AsDate().GetValue() + TimeSpan.FromDays((double)args.GetAsDecimal("b").GetValue())));
}
if (a.IsSet())
{
if (b.IsCollection())
{
return(new ValueSet(a.AsSet().GetValue()).AddItems(b.AsSet().GetValue()));
}
return(new ValueSet(a.AsSet().GetValue()).AddItem(b));
}
if (b.IsList())
{
var result = new ValueList();
result.AddItem(a);
result.AddItems(b.AsList().GetValue());
return(result);
}
if (b.IsSet())
{
var result = new ValueSet();
result.AddItem(a);
result.AddItems(b.AsSet().GetValue());
return(result);
}
if (a.IsString() && b.IsAtomic() || a.IsAtomic() && b.IsString())
{
return(new ValueString(a.AsString().GetValue() + b.AsString().GetValue()));
}
throw new ControlErrorException(new ValueString("ERROR"), "Cannot add " + a + " and " + b, pos);
}