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/>.

**/

​

​

/**

 * A parser for Prometheus pattern.

 */

class CPrometheusPatternParser extends CParser {

​

    /**

     * @var array

     */

    private $macro_parsers = [];

​

    private $options = [

        'usermacros' => false,

        'lldmacros' => false

    ];

​

    public function __construct($options = []) {

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

​

        if ($this->options['usermacros']) {

            array_push($this->macro_parsers, new CUserMacroParser, new CUserMacroFunctionParser);

        }

        if ($this->options['lldmacros']) {

            array_push($this->macro_parsers, new CLLDMacroParser, new CLLDMacroFunctionParser);

        }

    }

​

    /**

     * Parse the given source string.

     *

     * metric { label1 =~ "value1" , label2 =" value2" } == number

     *

     * @param string $source  Source string that needs to be parsed.

     * @param int    $pos     Position offset.

     */

    public function parse($source, $pos = 0) {

        $this->length = 0;

        $this->match = '';

​

        $has_metric_name = false;

​

        $p = $pos;

​

        if ($this->parseMetric($source, $p)) {

            $has_metric_name = true;

        }

​

        $p_tmp = $p;

​

        if ($has_metric_name) {

            self::skipWhitespaces($source, $p_tmp);

        }

​

        if ($this->parseLabelsValues($source, $p_tmp, $has_metric_name)) {

            $p = $p_tmp;

        }

        elseif (!$has_metric_name) {

            return self::PARSE_FAIL;

        }

​

        $p_tmp = $p;

​

        self::skipWhitespaces($source, $p_tmp);

​

        if ($this->parseComparisonOperator($source, $p_tmp)) {

            self::skipWhitespaces($source, $p_tmp);

​

            if ($this->parseNumber($source, $p_tmp)) {

                $p = $p_tmp;

            }

        }

​

        $this->length = $p - $pos;

        $this->match = substr($source, $pos, $this->length);

​

        return isset($source[$p]) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;

    }