# File vendor/rails/actionpack/lib/action_controller/routing.rb, line 542
542:       def initialize
543:         self.is_optional = false
544:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 573
573:       def all_optionals_available_condition(prior_segments)
574:         optional_locals = prior_segments.collect { |s| s.local_name if s.optional? && s.respond_to?(:local_name) }.compact
575:         optional_locals.empty? ? nil : " if #{optional_locals * ' && '}"
576:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 551
551:       def continue_string_structure(prior_segments)
552:         if prior_segments.empty?
553:           interpolation_statement(prior_segments)
554:         else
555:           new_priors = prior_segments[0..-2]
556:           prior_segments.last.string_structure(new_priors)
557:         end
558:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 546
546:       def extraction_code
547:         nil
548:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 561
561:       def interpolation_statement(prior_segments)
562:         chunks = prior_segments.collect { |s| s.interpolation_chunk }
563:         chunks << interpolation_chunk
564:         "\"#{chunks * ''}\"#{all_optionals_available_condition(prior_segments)}"
565:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 580
580:       def match_extraction(next_capture)
581:         nil
582:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 588
588:       def optionality_implied?
589:         false
590:       end

     # File vendor/rails/actionpack/lib/action_controller/routing.rb, line 567
567:       def string_structure(prior_segments)
568:         optional? ? continue_string_structure(prior_segments) : interpolation_statement(prior_segments)
569:       end