From method redefinition to classless Ruby

ruby-talk
1

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.

http://ruby-smalltalk.blogspot.com/

Cheers
Robert

···

--
[...] as simple as possible, but no simpler.
-- Attributed to Albert Einstein

2

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.

···

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.

    #
    # 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.

3

Robert, c'est très intéressant! I will keep your code and play a
little bit with it some time.

Regards,
Pit

···

2007/8/2, Robert Dober <robert.dober@gmail.com>:

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.

http://ruby-smalltalk.blogspot.com/

4

> 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?

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
:(.

Cheers
Robert

···

On 8/3/07, Trans <transfire@gmail.com> wrote:

On Aug 2, 4:43 pm, "Robert Dober" <robert.do...@gmail.com> wrote:

--
[...] as simple as possible, but no simpler.
-- Attributed to Albert Einstein

5

> 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.
>
> http://ruby-smalltalk.blogspot.com/

Robert, c'est très intéressant! I will keep your code and play a
little bit with it some time.

Merci, very kind of you, I am sure you are aware of the very basic
Object#deepdup, I am about to "fix" it...
it will become

Kernel#__deepdup__ object, object_track={}

I guess you know what it will eventually do, it is the workerbee stuff
which is not interesting but has to be done :(.

Cheers
Robert

···

On 8/4/07, Pit Capitain <pit.capitain@gmail.com> wrote:

2007/8/2, Robert Dober <robert.dober@gmail.com>:

Regards,
Pit

--
[...] as simple as possible, but no simpler.
-- Attributed to Albert Einstein

6

> > 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 :slight_smile: 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.

···

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: