extract_parameterized_parts

# File actionpack/lib/action_dispatch/journey/formatter.rb, line 59
        def extract_parameterized_parts(route, options, recall, parameterize = nil)
          parameterized_parts = recall.merge(options)

          keys_to_keep = route.parts.reverse_each.drop_while { |part|
            !options.key?(part) || (options[part] || recall[part]).nil?
          } | route.required_parts

          parameterized_parts.delete_if do |bad_key, _|
            !keys_to_keep.include?(bad_key)
          end

          if parameterize
            parameterized_parts.each do |k, v|
              parameterized_parts[k] = parameterize.call(k, v)
            end
          end

          parameterized_parts.keep_if { |_, v| v }
          parameterized_parts
        end