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<?php declare(strict_types = 0);
/*
** Zabbix
** Copyright (C) 2001-2023 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 numbers with optional time or byte suffix.
*/
class CNumberParser extends CParser {
/**
* Parser options.
*
* @var array
*/
private $options = [
'with_minus' => true,
'with_float' => true,
'with_size_suffix' => false,
'with_time_suffix' => false,
'with_year' => false
];
/**
* Parsed number without time or byte suffix.
*
* @var string
*/
private $number;
/**
* Parsed time or byte suffix, or null, if wasn't found.
*
* @var string|null
*/
private $suffix;
/**
* Acceptable time and byte suffixes.
*
* @var string
*/
private $suffixes;
/**
* Suffix multiplier table for value calculation.
*
* @var array
*/
private static $suffix_multipliers;
public function __construct(array $options = []) {
$this->options = array_replace($this->options, array_intersect_key($options, $this->options));
if ($this->options['with_size_suffix'] && $this->options['with_year']) {
throw new Exception('Ambiguous options.');
}
if ($this->options['with_size_suffix']) {
$this->suffixes .= ZBX_BYTE_SUFFIXES;
self::$suffix_multipliers = ZBX_BYTE_SUFFIX_MULTIPLIERS;
}
if ($this->options['with_time_suffix']) {
$this->suffixes .= $this->options['with_year'] ? ZBX_TIME_SUFFIXES_WITH_YEAR : ZBX_TIME_SUFFIXES;
self::$suffix_multipliers += ZBX_TIME_SUFFIX_MULTIPLIERS;
}
}
/**
* Parse number with optional time or byte suffix.
*
* !!! Don't forget sync code with C !!!
*
* @param string $source string to parse
* @param int $pos position to start from
*
* @return int
*/
public function parse($source, $pos = 0): int {
$this->length = 0;
$this->match = '';
$this->number = null;
$this->suffix = null;
$fragment = substr($source, $pos);
$pattern = $this->options['with_float'] ? ZBX_PREG_NUMBER : ZBX_PREG_INT;
$pattern = ($this->options['with_size_suffix'] || $this->options['with_time_suffix'])
? '/^'.$pattern.'(?<suffix>['.$this->suffixes.'])?/'
: '/^'.$pattern.'/';
if (!preg_match($pattern, $fragment, $matches)) {
return self::PARSE_FAIL;
}
$number = $this->options['with_float'] ? $matches['number'] : $matches['int'];
if ($number[0] === '-' && !$this->options['with_minus']) {
return self::PARSE_FAIL;
}
$this->length = strlen($matches[0]);
$this->match = $matches[0];
$this->number = $number;
$this->suffix = array_key_exists('suffix', $matches) ? $matches['suffix'] : null;
return ($pos + $this->length < strlen($source)) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
}
/**
* Calculate value of parsed number in a decimal notation.
*
* @return float
*/
public function calcValue(): float {
$number = (float) $this->number;
if ($this->suffix !== null) {
$number *= self::$suffix_multipliers[$this->suffix];
}
return $number;
}
/**
* Get suffix of parsed number.
*
* @return string|null
*/
public function getSuffix(): ?string {
return $this->suffix;
}
}
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