code: def present(cls, rule_description):
      def join_lines(lines):
          if not isinstance(lines, list) or not lines:
              return ""
  
          document = None
          buffered_newlines = ""
          for line in lines:
              if not line:
                  buffered_newlines += "\n"
                  continue
  
              if document is None:
                  buffered_newlines = ""
                  document = line
              else:
                  match = cls._URL_REGEX.match(document + line)
                  if match is not None:
                      document += line
                  else:
                      space = (
                          buffered_newlines
                          if buffered_newlines
                          else " "
                      )
                      buffered_newlines = ""
                      document += space + line
  
          if document is None:
              document = ""
  
          return document
  
      fragments = cls.parse(rule_description)
  
      presentation = {
          "author": "",
          "description": "",
          "fields": {},
      }
  
      for key, value in fragments.items():
          if key in ["author", "maintainer"]:
              presentation["author"] = join_lines(value)
          elif key in ["description"]:
              presentation["description"] = join_lines(value)
          else:
              presentation["fields"][key] = join_lines(value)
  
      return presentation
  
imports: import re
label_desc: Use image node_id 2 for calling the RuleDescriptionParser obj's underlying member method code with example usage: obj.present(cls, rule_description) and returns: presentation, document, str