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 to convert calculated item keys.

 */

class C52CalculatedItemConverter extends C52TriggerExpressionConverter {

​

    /**

     * Item key parser.

     *

     * @var CItemKey

     */

    protected $item_key_parser;

​

    /**

     * Function parser.

     *

     * @var C10FunctionParser

     */

    protected $function_parser;

​

    public function __construct() {

        $this->parser = new C10TriggerExpression([

            'allow_func_only' => true,

            'calculated' => true

        ]);

        $this->item_key_parser = new CItemKey();

        $this->function_parser = new C10FunctionParser();

        $this->standalone_functions = getStandaloneFunctions();

    }

​

    /**

     * Convert calculated item formula to 5.4 syntax.

     *

     * @param string $formula  Calculated item formula to convert.

     *

     * @return string

     */

    public function convert($item) {

        $expression = preg_replace("/[\\r\\n\\t]/", '', $item['params']);

​

        if ($this->parser->parse($expression) === false) {

            return $item;

        }

​

        $functions = $this->parser->result->getTokensByType(C10TriggerExprParserResult::TOKEN_TYPE_FUNCTION);

        $this->hanged_refs = $this->checkHangedFunctionsPerHost($functions);

​

        for ($i = count($functions) - 1; $i >= 0; $i--) {