module Yema
  class Rule
    class Format < self

      attr_reader :format

      def initialize(attribute_name, options={})
        super
        extract_options(options)
      end

      def self.required_options
        [:format]
      end

      def matches?(value)
        !!(format =~ value)
      end

      private

      def extract_options(options)
        @format = options.fetch(:format)
        raise InvalidOptionError, "Format option only accept Regexp" unless format.kind_of?(Regexp)
      end

    end
  end
end