code: def anchor(parser, token):
      
      bits = [b for b in token.split_contents()]
      if len(bits) < 2:
          raise template.TemplateSyntaxError("anchor tag takes at least 1 argument.")
  
      title_is_var = False
      try:
          title = bits[2]
          if title[0] in ('"', "'"):
              if title[0] == title[-1]:
                  title = title[1:-1]
              else:
                  raise template.TemplateSyntaxError(
                      'anchor tag title must be a "string", _("trans string"), or variable'
                  )
          elif title.startswith('_("') or title.startswith("_('"):
              title = _(title[3:-2])
          else:
              title_is_var = True
      except IndexError:
          title = bits[1].capitalize()
  
      return SortAnchorNode(bits[1].strip(), title.strip(), title_is_var)
docs: Parses a tag that's supposed to be in this format '{% anchor field title %}'
      Title may be a "string", _("trans string"), or variable