Zabbix

<?php

/*

** Copyright (C) 2001-2025 Zabbix SIA

**

** This program is free software: you can redistribute it and/or modify it under the terms of

** the GNU Affero General Public License as published by the Free Software Foundation, version 3.

**

** This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;

** without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

** See the GNU Affero General Public License for more details.

**

** You should have received a copy of the GNU Affero General Public License along with this program.

** If not, see <https://www.gnu.org/licenses/>.

**/

​

class CConditionFormula {

​

    // possible parsing states

    const STATE_AFTER_OPEN_BRACE = 0;

    const STATE_AFTER_OPERATOR = 1;

    const STATE_AFTER_CLOSE_BRACE = 2;

    const STATE_AFTER_CONSTANT = 3;

    const STATE_AFTER_NOT_OPERATOR = 4;

​

    /**

     * Set to true of the formula is valid.

     *

     * @var bool

     */

    public $isValid;

​

    /**

     * Error message if the formula is invalid.

     *

     * @var string

     */

    public $error;

​

    /**

     * The parsed formula.

     *

     * @var string

     */

    public $formula;

​

    /**

     * Array of unique constants used in the formula.

     *

     * @var array

     */

    public $constants = [];

​

    /**

     * Array of supported operators.

     *

     * @var array

     */

    protected $allowedOperators = ['and', 'or'];

​

    /**

     * Current position on a parsed element.

     *

     * @var integer