Zabbix

<?php

/*

** Zabbix

** Copyright (C) 2001-2022 Zabbix SIA

**

** This program is free software; you can redistribute it and/or modify

** it under the terms of the GNU General Public License as published by

** the Free Software Foundation; either version 2 of the License, or

** (at your option) any later version.

**

** 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 General Public License for more details.

**

** You should have received a copy of the GNU General Public License

** along with this program; if not, write to the Free Software

** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

**/

​

​

/**

 * A parser for relative time in "now[/<yMwdhm>][<+->N<yMwdhms>[/<yMwdhm>]]" format.

 */

class CRelativeTimeParser extends CParser {

​

    const ZBX_TOKEN_PRECISION = 0;

    const ZBX_TOKEN_OFFSET = 1;

​

    /**

     * @var array $tokens  An array of tokens for relative date.

     */

    private $tokens;

​

    private $user_macro_parser;

    private $lld_macro_parser;

    private $lld_macro_function_parser;

​

    /**

     * An options array.

     *

     * Supported options:

     *   'usermacros' => false  Enable user macros usage in the periods.

     *   'lldmacros' => false   Enable low-level discovery macros usage in the periods.

     *

     * @var array

     */

    public $options = [

        'usermacros' => false,

        'lldmacros' => false

    ];

​

    /**

     * @param array $options

     */

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

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

​

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

            $this->user_macro_parser = new CUserMacroParser();

        }

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

            $this->lld_macro_parser = new CLLDMacroParser();

            $this->lld_macro_function_parser = new CLLDMacroFunctionParser();

        }

    }

​

    /**

     * Parse the given period.

     *

     * @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 = '';

        $this->tokens = [];

​

        $p = $pos;

​

        if (!$this->parseRelativeTime($source, $p) && !$this->parseMacros($source, $p)) {

            return self::PARSE_FAIL;

        }

​

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

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

​

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

    }

​

    /**