module Yema
  module Registry
    class Rule
      include Enumerable

      attr_reader :rules

      def initialize
        @rules = Set.new
      end

      def add(rule)
        @rules << rule if rule
      end

      def merge(rule_set)
        @rules.merge(rule_set)
      end

      def each
        return enum_for :each unless block_given?
        @rules.each{|rule| yield rule}
      end
    end
  end
end