or_p_expression : xor_p_expression OP_OR_P or_p_expression
                      | xor_p_expression

def p_or_p_expression(tok):
        """or_p_expression : xor_p_expression OP_OR_P or_p_expression
                      | xor_p_expression"""
        if len(tok) == 4:
            tok[0] = LogicalBinOpRule(tok[2], tok[1], tok[3])
        else:
            tok[0] = tok[1]