code: def do_uni_form(parser, token):
      
      token = token.split_contents()
      form = token.pop(1)
  
      helper = None
      template_pack = "'%s'" % get_template_pack()
  
      # {% crispy form helper %}
      try:
          helper = token.pop(1)
      except IndexError:
          pass
  
      # {% crispy form helper 'bootstrap' %}
      try:
          template_pack = token.pop(1)
      except IndexError:
          pass
  
      # {% crispy form 'bootstrap' %}
      if (
          helper is not None and
          isinstance(helper, string_types) and
          ("'" in helper or '"' in helper)
      ):
          template_pack = helper
          helper = None
  
      if template_pack is not None:
          template_pack = template_pack[1:-1]
          ALLOWED_TEMPLATE_PACKS = getattr(
              settings,
              'CRISPY_ALLOWED_TEMPLATE_PACKS',
              ('bootstrap', 'uni_form', 'bootstrap3', 'bootstrap4')
          )
          if template_pack not in ALLOWED_TEMPLATE_PACKS:
              raise template.TemplateSyntaxError(
                  "crispy tag's template_pack argument should be in %s" %
                  str(ALLOWED_TEMPLATE_PACKS)
              )
  
      return CrispyFormNode(form, helper, template_pack=template_pack)
docs: You need to pass in at least the form/formset object, and can also pass in the
      optional `crispy_forms.helpers.FormHelper` object.
  
      helper (optional): A `crispy_forms.helper.FormHelper` object.
  
      Usage::
  
          {% load crispy_tags %}
          {% crispy form form.helper %}
  
      You can also provide the template pack as the third argument::
  
          {% crispy form form.helper 'bootstrap' %}
  
      If the `FormHelper` attribute is named `helper` you can simply do::
  
          {% crispy form %}
          {% crispy form 'bootstrap' %}