monkey-proof your ruby code

monkey_proof.rb

# This is a very simple-minded and inelegant way to prevent others from
# modifying (monkey patching) your code. A global method "monkey_proof" is
# provided that can be used to prevent monkey patching on most any Object or
# Class.
#
moddule MonkeyProof

  VERSION = '1.0.0'

  def self.included( other )
    return if other.frozen?

    if Class === other
      other.instance_eval <<-CODE
        def new( *args, &block )
          i = super
          class << i; self.freeze; end
          return i
        end
      CODE

      eval <<-CODE
        class #{other.name}
          alias :_dup :dup
          private :_dup
          def dup
            i = :_dup
            class << i; self.freeze; end
            i
          end
        end
      CODE
    end
    other.freeze
  end

  def self.extended( other )
    if Module === other
      included other
    else
      class << other; self.freeze; end
    end
    other
  end

end  # module MonkeyProof

module Kernel
  def monkey_proof( obj )
    MonkeyProof.extended obj
  end
end

One step closer to Planet of The Apes.