Memorizes a function or a class decorator

def _onDecorator( self, name, line, pos, absPosition ):
        " Memorizes a function or a class decorator "
        # A class or a function must be on the top of the stack
        self.objectsStack[ -1 ].decorators.append(
                                            Decorator( name, line, pos,
                                                       absPosition ) )
        return