code: def context_processor(self, func: Callable) -> Callable:
          
          self.record_once(lambda state: state.app.context_processor(func, self.name))
          return func
docs: Add a context processor function to this blueprint.
  
          This is designed to be used as a decorator, and has the same
          arguments as :meth:`~quart.Quart.context_processor`. This will
          add context to all templates rendered in this blueprint's
          routes. An example usage,
  
          .. code-block:: python
  
              blueprint = Blueprint(__name__)
              @blueprint.context_processor
              def processor():
                  ...