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91 lines
2.4 KiB
91 lines
2.4 KiB
<?php declare(strict_types = 0);
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* Class for validating math functions.
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*/
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class CMathFunctionValidator extends CValidator {
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/**
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* An options array.
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*
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* Supported options:
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* 'parameters' => [] Number of required parameters of known math functions.
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*
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* @var array
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*/
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private $options = [
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'parameters' => []
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];
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/**
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* @param array $options
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*/
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public function __construct(array $options = []) {
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$this->options = $options + $this->options;
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}
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/**
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* Validate math function.
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*
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* @param array $token A token of CExpressionParserResult::TOKEN_TYPE_MATH_FUNCTION type.
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*
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* @return bool
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*/
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public function validate($token) {
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if (!array_key_exists($token['data']['function'], $this->options['parameters'])) {
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$this->setError(_s('unknown function "%1$s"', $token['data']['function']));
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return false;
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}
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$num_parameters = count($token['data']['parameters']);
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foreach ($this->options['parameters'][$token['data']['function']] as $rule) {
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$is_valid = true;
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if (array_key_exists('count', $rule)) {
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$is_valid = $num_parameters == $rule['count'];
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}
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if ($is_valid && array_key_exists('min', $rule)) {
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$is_valid = $num_parameters >= $rule['min'];
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if ($is_valid && array_key_exists('step', $rule)) {
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$is_valid = ($num_parameters - $rule['min']) % $rule['step'] == 0;
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}
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}
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if ($is_valid && array_key_exists('max', $rule)) {
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$is_valid = $num_parameters <= $rule['max'];
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}
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if ($is_valid) {
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return true;
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}
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}
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$this->setError(_s('invalid number of parameters in function "%1$s"', $token['data']['function']));
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return false;
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}
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}
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