From: Xavier Shay <contact@...>
Date: 2008-10-27T17:15:17+09:00
Subject: Access module's anonymous parent

I want the following eval to output "Foo called", without having a named
constant, since in leaks in to the calling scope:

m = Module.new
m.instance_eval do
  def foo
    puts "Foo called"
  end
  ParentSelf = self
  class self::A
    ParentSelf.foo # How do I do this without a constant?
  end
end
a = m.const_get('A').new
puts ParentSelf # This should raise - constant should not exist


I have found given self and a global function, I can use the string
representation of the anon module to find it in ObjectSpace. Clearly
this is dodgy though:

def depend(instance, file)
  q = self.to_s.split('::').first.to_s
  found = nil
  ObjectSpace.each_object(Module) do |m|
    found = m if q == m.to_s
  end
  found.depend(file)
end

m = Module.new
m.instance_eval do
  def depend(file)
    puts "Depend called with file: #{file}"
  end

  class self::A
    depend(self, 'afile.rb')
  end
end
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