From: David Alan Black <dblack@...>
Date: 2001-11-01T07:20:06+09:00
Subject: [ruby-talk:24039] Re: No public methods in 'Object' ?

Hello --

On Thu, 1 Nov 2001, Johan Holmberg wrote:

>
> On Thu, 1 Nov 2001, ts wrote:
> >
> > >         $ ruby -e 'p Object.instance_methods(1).length'
> > >         37
> >
> > pigeon% ruby -e 'p Kernel.instance_methods.length'
> > 37
> > pigeon%
> >
> > pigeon% ruby -e 'p Object.instance_methods(1).length'
> > 37
> > pigeon%
> >
> >
> >  Kernel is a module which is included in Object, and where are defined
> >  instance methods of Object
> >
>
> Thanks.
> Now when I reread about 'Object' in the Pickaxe-book I see that
> the inclusion of 'Kernel' is mentioned there.
>
> One of the reasons why I asked my original question is that I'm
> trying to figure out how to tell where each public method in a class
> is defined. I would like to be able to do:
>
>     some_class = String  # for example
>
>     some_class.instance_methods(1).each { |m|
>         defined_in = ....
>         puts "method #{m} is defined in #{defined_in}"
>     }
>
> I can't figure out what to write instead of "....".
> Is there some way to do this without duplicating Ruby's own
> search-algorithm among the ancestor classes and modules ?

This might be too simplistic for your purposes, but anyway...

  some_class.instance_eval do
    public_instance_methods(true).sort.each do |im|
      defined_in = ancestors.reverse.find do |anc|
        anc.instance_methods.include?(im)
      end
      p "#{im} defined_in #{defined_in}"
    end
  end


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav