module CanTango
  module Loader
    class Yaml
      attr_accessor :file_name

      def self.inherited subclass
        subclass.extend ClassMethods
      end

      def parser
        raise NotImplementedError
      end

      def yml_content
        YAML.load_file(file_name)
      rescue
        raise "Couldn't load permissions file: #{file_name}. Either disable Permission engine or add this file."
      end

      module ClassMethods
        protected

        def config_file name
          File.join(config_path, "#{name}.yml") if rails?
        end

        def config_path
          CanTango.config.permissions.config_path
        end
      end
    end
  end
end