gistfile1.rb

  module Memoized
    def method_added(method_name)
      if instance_method(method_name).arity.zero?
        protecting_against_infinite_method_added_loop do
          memoize(method_name)
        end
      end
    end
    
    def memoize(method_name)
      sanitized_name = method_name.to_s
      sanitized_name = sanitized_name.sub(/!$/, '_bang')
      sanitized_name = sanitized_name.sub(/\?$/, '_question')
      complete_name = "#{sanitized_name}_#{object_id}"
      
      class_eval(<<-EVAL, __FILE__, __LINE__)
        alias compute_#{complete_name} #{method_name}        # alias compute_superklass_question_12099690 superklass?                          
                                                             #                                                                                     
        def #{method_name}                                   # def superklass?                                                                     
          unless defined?(@#{complete_name})                 #   unless defined?(@superklass_question_12099690)                            
            @#{complete_name} = compute_#{complete_name}     #     @superklass_question_12099690 = compute_superklass_question_12099690
          end                                                #   end                                                                               
          @#{complete_name}                                  #   @superklass_question_12099690                                             
        end                                                  # end                                                                                 
      EVAL
    end
    
    def protecting_against_infinite_method_added_loop
      unless @memoizing
        @memoizing = true
        yield
        @memoizing = false
      end
    end
  end
  
  class Base < Treetop::Runtime::SyntaxNode
    extend Memoized