On Feb 5, 3:23 pm, ara.t.how... / noaa.gov wrote:
>    harp:~ > cat a.rb
>    class Module
>      def nesting
>        parent, child = nil
>        name.split('::').inject(Object){|parent, child| parent.const_get child}
>        Object == parent ? nil : parent
>      end
>    end
>
>    class A
>      class B
>        class C
>          class D
>          end
>        end
>      end
>    end
>
>    p  A.nesting
>    p  A::B.nesting
>    p  A::B::C.nesting
>    p  A::B::C::D.nesting
>
>    harp:~ > ruby a.rb
>    nil
>    A
>    A::B
>    A::B::C

irb(main):001:0> require 'facets/core/module/nesting'
=> true
irb(main):002:0> class A
irb(main):003:1> class B
irb(main):004:2> class C
irb(main):005:3> class D
irb(main):006:4> end
irb(main):007:3> end
irb(main):008:2> end
irb(main):009:1> end
=> nil
irb(main):010:0> A.nesting
=> [A]
irb(main):011:0> B.nesting
NameError: uninitialized constant B
        from (irb):11
        from :0
irb(main):012:0> A::B.nesting
=> [A, A::B]
irb(main):013:0> A::B::C.nesting
=> [A, A::B, A::B::C]
irb(main):014:0> A::B::C::D.nesting
=> [A, A::B, A::B::C, A::B::C::D]

class Module
  def nesting
    n = []
    name.split(/::/).inject(self){ |mod, name| c =
mod.const_get(name) ; n << c ; c }
    return n
  end
end

T.