docs: def setup(self):
          """Setup."""
  
          self.context_visible_first = self.config['context_visible_first']
          self.delimiters = []
          self.escapes = None
          self.line_endings = self.config['normalize_line_endings']
          escapes = []
          for delimiter in self.config['delimiters']:
              if not isinstance(delimiter, dict):
                  continue
              group = util.random_name_gen()
              while (
                  group in delimiter['open'] or
                  group in delimiter['close'] or
                  group in delimiter.get('content', DEFAULT_CONTENT)
              ):
                  group = util.random_name_gen()
  
              pattern = r'%s(?P<%s>%s)(?:%s|\Z)' % (
                  delimiter['open'],
                  group,
                  delimiter.get('content', DEFAULT_CONTENT),
                  delimiter['close']
              )
              self.delimiters.append((re.compile(pattern, re.M), group))
          escapes = self.config['escapes']
          if escapes:
              self.escapes = re.compile(escapes)