evaluate

# File actionpack/lib/action_dispatch/journey/visitors.rb, line 35
      def evaluate(hash)
        parts = @parts.dup

        @parameters.each do |index|
          param = parts[index]
          value = hash[param.name]
          return ''.freeze unless value
          parts[index] = param.escape value
        end

        @children.each { |index| parts[index] = parts[index].evaluate(hash) }

        parts.join
      end