docs: def active(parser, token):
      """ tag to determine if a link is to the current page, and if it is, sets 'link_active'
          to True in the context.
  
          Use:
              {% active path view strict[True,False] arg1 arg2 arg3 %}
  
              path:   the path to check. Generally this is just 'request.path'
              view:   the view that you want to check against the path. (uses reverse)
              strict: if strict is true, then the two paths need to be exactly the same.
                      if strict is false, then a path of /some/path/ and a view with the url
                      /some/ will match.
              args:   args needed by the given view to get its path using reverse.
  
          Example:
              {% active request.path "settings" True %}
              <a href="{% url settings %}" class="{% if link_active %} active{% endif %}">
  
          """
      args = token.split_contents()
      path = args[1]
      view = args[2].replace('"', '').replace("'", '')
      strict = args[3].replace('"', '').replace("'", '')
  
      arg1 = None; arg2 = None; arg3 = None
      if len(args) > 4:
          arg1 = args[4]
      if len(args) > 5:
          arg2 = args[5]
      if len(args) > 6:
          arg3 = args[6]
      if not view:
          raise template.TemplateSyntaxError, "%r tag requires at least one view argument" % token.contents.split()[0]
      return ActiveTag(view, path, strict, arg1, arg2, arg3)