From: Robert Dober <robert.dober@...>
Date: 2007-07-25T22:58:15+09:00
Subject: Re: Help: Get list of modules which are included in the class

On 7/25/07, dohzya <dohzya@gmail.com> wrote:
> Le mercredi 25 juillet 2007 � 20:04 +0900, FireAphis a �crit :
> > There is another problem. If C2 doesn't inherit another class but does
> > include the modules and those modules by themselves include modules
> > then your code, still, will return the whole hierarchy. Look at this:
> >
> > module M1; end
> > module M2; include M1; end
> > class C2; include M2; end
> >
> > p (C2.ancestors - [C2] - C2.superclass.ancestors) # => [M1, M2]
> >
> > That's because C2.superclass => Object
> >
> > :(
> >
> > FireAphis
>
> You're right, but it can be fixed :)
no it cannot :(, look at C4 below
> ---
> class Class
>   def included_modules
>     c = self
>     all = c.ancestors - [c]
>     bad = all.map {|a|
>       a.ancestors - [a]
>     }
>     # Module#superclass doesn't exist
>     bad << c.superclass if c.is_a? Class
>     all - bad.flatten
>   end
> end
>
> module M1; end
> module M2; include M1; end
> module M3; end
> module M4; include M3; end
> module M5; end
> module M6; include M5; end
> module M7; end
> class C1; include M2; end
> class C2<C1; include M4; end
> class C3<C2; include M6; include M7; end
class C4<C2; include M5; include M6; end
*************************************
M5 will not show up.



>
> p C3.included_modules # => [M7, M6]
>
>
> ---
> sorry if I've sent 3 messages, I'm fighting with my mail client...
>
> --
> Etienne
>
>
>


-- 
I always knew that one day Smalltalk would replace Java.
I just didn't know it would be called Ruby
-- Kent Beck