'Process the next character of input through the translation finite
state maching (FSM). There are two possible states, buffer pending
and not pending, but those are hidden behind the ``.flush()`` method
which must be called at the end of text to ensure any pending
``<w:t>`` element is written.'

def add_char(self, char):

    if (char == ' DCTB '):
        self.flush()
        self._r.add_tab()
    elif (char in '\r\n'):
        self.flush()
        self._r.add_br()
    else:
        self._bfr.append(char)
