You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: go_sum_linker.rb
    path of file: ./repos/gitlabhq/lib/gitlab/dependency_linker
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Gitlab
  module DependencyLinker
    class GoSumLinker < GoModLinker
      self.file_type = :go_sum

      private

      BASE64 = Gitlab::Regex.base64_regex
      REGEX = Regexp.new("^\\s*(?<name>#{NAME.source})\\s+(?<version>v#{SEMVER.source})(\/go.mod)?\\s+h1:(?<checksum>#{BASE64.source})\\s*$", NAME.options).freeze

      # ru
    
      def link_dependencies
        highlighted_lines.map!.with_index do |rich_line, i|
          plain_line = plain_lines[i].chomp
          match = REGEX.match(plain_line)
          next rich_line unless match

          i0, j0 = match.offset(:name)
          i2, j2 = match.offset(:checksum)

          marker = StringRangeMarker.new(plain_line, rich_line.html_safe)
          marker.mark([i0..(j0 - 1), i2..(j2 - 1)]) do |text, left:, right:, mode:|
            if left
              url = package_url(text, match[:version])
              url ? link_tag(text, url) : text

            elsif right
              link_tag(text, "https://sum.golang.org/lookup/#{match[:name]}@#{match[:version]}")
            end
          end
        end