154     def _is_escapable(self, c, delim=None):  argument
155         if delim is None:
159                 delim = '"'
163                 delim = self._stack[-2][0]
165         escapables = self.ESCAPABLE.get(delim, None)
424     def __init__(self, op, delim):  argument
426         if not delim:
427             raise ShellSyntaxError('invalid here document delimiter %s' % str(delim))
430         self._delim = delim
719         for token, type, delim in heredoc.pendings:
722             self._push_token(delim)
724     def _push_token(self, delim):  argument
741                 self._heredoc.pendings.append((self._token, self._type, delim))    
770             if '=' in self._token and not delim:
791                 elif are_digits(self._token) and delim in ('<', '>'):