Method token

nltk/sem/logic.py:264–276

Get the next waiting token. If a location is given, then return the token at currentIndex+location without advancing currentIndex; setting it gives lookahead/lookback capability.

(self, location=None)

        return self._currentIndex + location < len(self._buffer)

    def token(self, location=None):
        """Get the next waiting token.  If a location is given, then
        return the token at currentIndex+location without advancing
        currentIndex; setting it gives lookahead/lookback capability."""
        try:
            if location is None:
                tok = self._buffer[self._currentIndex]
                self._currentIndex += 1
            else:
                tok = self._buffer[self._currentIndex + location]
            return tok
        except IndexError as e:
            raise ExpectedMoreTokensException(self._currentIndex + 1) from e

    def isvariable(self, tok):
        return tok not in Tokens.TOKENS