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require 'active_support/inflector'

class Module
  # Returns the name of the module containing this one.
  #
  # M::N.parent_name # => "M"
  def parent_name
    if defined? @parent_name
      @parent_name
    else
      @parent_name = name =~ /::[^:]+\Z/ ? $`.freeze : nil
    end
  end

  # Returns the module which contains this one according to its name.
  #
  # module M
  # module N
  # end
  # end
  # X = M::N
  #
  # M::N.parent # => M
  # X.parent # => M
  #
  # The parent of top-level and anonymous modules is Object.
  #
  # M.parent # => Object
  # Module.new.parent # => Object
  def parent
    parent_name ? ActiveSupport::Inflector.constantize(parent_name) : Object
  end

  # Returns all the parents of this module according to its name, ordered from
  # nested outwards. The receiver is not contained within the result.
  #
  # module M
  # module N
  # end
  # end
  # X = M::N
  #
  # M.parents # => [Object]
  # M::N.parents # => [M, Object]
  # X.parents # => [M, Object]
  def parents
    parents = []
    if parent_name
      parts = parent_name.split('::')
      until parts.empty?
        parents << ActiveSupport::Inflector.constantize(parts * '::')
        parts.pop
      end
    end
    parents << Object unless parents.include? Object
    parents
  end

  def local_constants #:nodoc:
    constants(false)
  end
end
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