Zabbix

<?php

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

​

/**

 * Trigger expressions parser.

 */

class C10TriggerExpression {

    // For parsing of trigger expression.

    const STATE_AFTER_OPEN_BRACE = 1;

    const STATE_AFTER_BINARY_OPERATOR = 2;

    const STATE_AFTER_LOGICAL_OPERATOR = 3;

    const STATE_AFTER_NOT_OPERATOR = 4;

    const STATE_AFTER_MINUS_OPERATOR = 5;

    const STATE_AFTER_CLOSE_BRACE = 6;

    const STATE_AFTER_CONSTANT = 7;

​

    // Error type constants.

    const ERROR_LEVEL = 1;

    const ERROR_UNEXPECTED_ENDING = 2;

    const ERROR_UNPARSED_CONTENT = 3;

​

    /**

     * Shows a validity of trigger expression

     *

     * @var bool

     */

    public $isValid;

​

    /**

     * An error message if trigger expression is not valid

     *

     * @var string

     */

    public $error;

​

    /**

     * Type of parsing error, on of self::ERROR_* constant or 0 when no errors.

     *

     * @var int

     */

    public $error_type;

​

    /**

     * In case of error contain failed position in expression string. Contain -1 when no errors.

     *