Module#nesting (NOT the class method - instance method)

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

-a

On Feb 5, 3:23 pm, [email protected] wrote:

 class B

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.

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