module_scope.rb

require 'rubygems'
require 'extlib'

module Extlib
  module Inflection
    class << self
      # Take a complete module/class name and returns the scope where that module/class has been defined:
      #
      # @example
      #   module_scope("ActiveRecord::CoreExtensions::String::Inflections") #=> "ActiveRecord::CoreExtensions::String"
      #   module_scope("::Inflections") #=> "Kernel"
      #   module_scope("Inflections") #=> "Kernel"
      #
      # You can use the return string with Extlib::Inflection.constantize() in order to reopen that module/class.
      # 
      def module_scope(str)
      	new_str = str.gsub(/::#{Extlib::Inflection.demodulize(str)}/,'')
      	(new_str == str || new_str.empty?) ? "Kernel" : new_str
      end
    end
  end
end