def get_start_of_line_position(self, after_whitespace=False):
        """ Relative position for the start of this line. """
        if after_whitespace:
            current_line = self.current_line
            return len(current_line) - len(current_line.lstrip()) - self.cursor_position_col
        else:
            return - len(self.current_line_before_cursor)
Relative position for the start of this line.