# File lib/domainatrix/domain_parser.rb, line 12
    def read_dat_file(file_name)
      File.readlines(file_name).each do |line|
        line = line.strip
        unless (line =~ /\/\//) || line.empty?
          parts = line.split(".").reverse

          sub_hash = @public_suffixes
          parts.each do |part|
            sub_hash = (sub_hash[part] ||= {})
          end
        end
      end
    end