Trans
8/3/2007 10:38:00 AM
On Aug 3, 2:25 am, "Robert Dober" <robert.do...@gmail.com> wrote:
> On 8/3/07, Trans <transf...@gmail.com> wrote:
>
>
>
> > On Aug 2, 4:43 pm, "Robert Dober" <robert.do...@gmail.com> wrote:
> > > Hi list
>
> > > Ara's post about method redefinition was extremely rich intellectual
> > > food, took some time to digest, but I just thought I share my findings
> > > with you.
>
> > Ara and Pit are impressive meta-coders indeed. Think Ara might even
> > have a Prototype lib
> > you'd enjoy.
>
> > BTW, if we were all good little scouts and always modularized our code
> > one could use:
>
> > class Module
> > # Prepend an "aspect" module to a module.
> > #
> > # module X
> > # def x; "x"; end
> > # end
> > #
> > # module U
> > # def x; '{' + super + '}'; end
> > # end
> > #
> > # X.prepend U
> > #
> > # X.x # => "{x}"
>
> > def prepend( aspect )
> > aspect.send(:include, self)
> > extend aspect
> > end
> > end
>
> > Another trick for common injuns:
>
> > class Class
>
> > # Prepend an "aspect" module to a class.
> > #
> > # class Firetruck
> > # def put_out_fire(option)
> > # "Put out #{option}"
> > # end
> > # end
> > #
> > # module FastFiretruck
> > # def put_out_fire(option)
> > # super("very #{option}!")
> > # end
> > # end
> > #
> > # Firetruck.prepend(FastFiretruck)
> > #
> > # ft = Firetruck.new
> > # ft.put_out_fire('fast') #=> "Put out very fast!"
>
> > def prepend( aspect )
> > _new = method(:new)
> > _allocate = method(:allocate)
> > (class << self; self; end).class_eval do
> > define_method(:new) do |*args|
> > o = _new.call(*args)
> > o.extend aspect
> > o
> > end
> > define_method(:allocate) do |*args|
> > o = _allocate.call(*args)
> > o.extend aspect
> > o
> > end
> > end
> > end
>
> > end
>
> > Albeit that has some unfortunate shortcomings.
>
> > T.
>
> Well I do not really see these shortcomings, I'd love to have this
> mail as a comment to my blogpost BTW, would you mind?
Go for it. The shortcoming in the later example are b/c it's static
and not dynamic, ie. it happens at the time of instantiation. So it's
not a simple thing to adjust on the fly. One could make it more
flexiable, but alas the Double Module Inclusion problem gets in the
way.
> Concerning Ara's Prototype library I have seen it flying by, I will
> have a closer look, sure deserves an Exolink. But probably Ara's had
> all the fun for himself already and there is nothing left to do for me
> :(.
Not at all, I think Ara's been looking for Prototype allies :) The
only problem with prototype.rb is that it's so far removed for writing
ordinary Ruby, few are willing to embrace it --it's almost like
writing in a different language.
T.