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/>.

**/

​

​

/**

 * A converter to convert trigger expression syntax from 5.2 to 5.4.

 */

class C52TriggerExpressionConverter extends CConverter {

​

    /**

     * Functions which are not related to item.

     *

     * @var array

     */

    protected $standalone_functions;

​

    /**

     * State of each host reference being present in some non-standalone function.

     *

     * @var array

     */

    protected $hanged_refs = [];

​

    /**

     * Host for simplified functions.

     *

     * @var string|null

     */

    protected $host;

​

    /**

     * Item for simplified functions.

     *

     * @var string|null

     */

    protected $item;

​

    /**

     * Old trigger expression syntax parser.

     *

     * @var C10TriggerExpression

     */

    protected $parser;

​

    public function __construct() {

        $this->parser = new C10TriggerExpression(['allow_func_only' => true]);

        $this->standalone_functions = getStandaloneFunctions();

    }

​

    /**

     * Converts trigger expression to new syntax.

     *

     * @param array  $trigger_data

     * @param string $trigger_data['expression']

     * @param string $trigger_data['host']                 (optional)

     * @param string $trigger_data['item']                 (optional)

     *

     * @return string

     */

    public function convert($trigger_data) {

        $this->item = (array_key_exists('item', $trigger_data) && $trigger_data['item']) ? $trigger_data['item'] : '';

        $this->host = (array_key_exists('host', $trigger_data) && $this->item) ? $trigger_data['host'] : '';

​

        if ($this->parser->parse($trigger_data['expression']) !== false) {

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

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

​

            $extra_expressions = [];

​

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

                [$new_expr, $extra_expr] = $this->convertFunction($functions[$i]['data'], $this->host, $this->item);

​

                $trigger_data['expression'] = substr_replace($trigger_data['expression'], $new_expr,

                    $functions[$i]['pos'], $functions[$i]['length']

                );

​

                if ($extra_expr !== null) {

                    $extra_expressions[] = $extra_expr;

                }