Zabbix

<?php declare(strict_types = 0);

/*

** 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 for validating math functions.

 */

class CMathFunctionValidator extends CValidator {

​

    /**

     * An options array.

     *

     * Supported options:

     *   'parameters' => []  Number of required parameters of known math functions.

     *

     * @var array

     */

    private $options = [

        'parameters' => []

    ];

​

    /**

     * @param array $options

     */

    public function __construct(array $options = []) {

        $this->options = $options + $this->options;

    }

​

    /**

     * Validate math function.

     *

     * @param array $token  A token of CExpressionParserResult::TOKEN_TYPE_MATH_FUNCTION type.

     *

     * @return bool

     */

    public function validate($token) {

        if (!array_key_exists($token['data']['function'], $this->options['parameters'])) {

            $this->setError(_s('unknown function "%1$s"', $token['data']['function']));

​

            return false;

        }

​

        $num_parameters = count($token['data']['parameters']);

​

        foreach ($this->options['parameters'][$token['data']['function']] as $rule) {

            $is_valid = true;

​

            if (array_key_exists('count', $rule)) {

                $is_valid = $num_parameters == $rule['count'];

            }

​