Method get_next_token_variable

nltk/sem/logic.py:362–373

(self, description)

        return accum

    def get_next_token_variable(self, description):
        try:
            tok = self.token()
        except ExpectedMoreTokensException as e:
            raise ExpectedMoreTokensException(e.index, "Variable expected.") from e
        if isinstance(self.make_VariableExpression(tok), ConstantExpression):
            raise LogicalExpressionException(
                self._currentIndex,
                "'%s' is an illegal variable name.  "
                "Constants may not be %s." % (tok, description),
            )
        return Variable(tok)

    def handle_lambda(self, tok, context):
        # Expression is a lambda expression