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156 lines
3.8 KiB
156 lines
3.8 KiB
1 year ago
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<?php declare(strict_types = 0);
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/*
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** Zabbix
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** Copyright (C) 2001-2023 Zabbix SIA
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program; if not, write to the Free Software
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** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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**/
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/**
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* A parser for numbers with optional time or byte suffix.
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*/
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class CNumberParser extends CParser {
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/**
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* Parser options.
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*
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* @var array
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*/
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private $options = [
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'with_minus' => true,
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'with_float' => true,
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'with_size_suffix' => false,
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'with_time_suffix' => false,
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'with_year' => false,
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'is_binary_size' => true
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];
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/**
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* Parsed number without time or byte suffix.
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*
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* @var string
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*/
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private $number;
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/**
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* Parsed time or byte suffix, or null, if wasn't found.
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*
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* @var string|null
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*/
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private $suffix;
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/**
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* Acceptable time and byte suffixes.
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*
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* @var string
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*/
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private $suffixes = '';
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/**
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* Suffix multiplier table for value calculation.
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*
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* @var array
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*/
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private $suffix_multipliers = [];
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public function __construct(array $options = []) {
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$this->options = array_replace($this->options, array_intersect_key($options, $this->options));
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if ($this->options['with_size_suffix'] && $this->options['with_year']) {
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throw new Exception('Ambiguous options.');
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}
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if ($this->options['with_size_suffix']) {
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$this->suffixes .= ZBX_SIZE_SUFFIXES;
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$this->suffix_multipliers += $this->options['is_binary_size']
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? ZBX_SIZE_SUFFIX_MULTIPLIERS_BINARY
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: ZBX_SIZE_SUFFIX_MULTIPLIERS;
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}
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if ($this->options['with_time_suffix']) {
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$this->suffixes .= $this->options['with_year'] ? ZBX_TIME_SUFFIXES_WITH_YEAR : ZBX_TIME_SUFFIXES;
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$this->suffix_multipliers += ZBX_TIME_SUFFIX_MULTIPLIERS;
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}
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}
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/**
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* Parse number with optional time or byte suffix.
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*
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* !!! Don't forget sync code with C !!!
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*
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* @param string $source string to parse
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* @param int $pos position to start from
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*
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* @return int
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*/
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public function parse($source, $pos = 0): int {
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$this->length = 0;
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$this->match = '';
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$this->number = null;
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$this->suffix = null;
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$fragment = substr($source, $pos);
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$pattern = $this->options['with_float'] ? ZBX_PREG_NUMBER : ZBX_PREG_INT;
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$pattern = ($this->options['with_size_suffix'] || $this->options['with_time_suffix'])
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? '/^'.$pattern.'(?<suffix>['.$this->suffixes.'])?/'
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: '/^'.$pattern.'/';
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if (!preg_match($pattern, $fragment, $matches)) {
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return self::PARSE_FAIL;
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}
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$number = $this->options['with_float'] ? $matches['number'] : $matches['int'];
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if ($number[0] === '-' && !$this->options['with_minus']) {
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return self::PARSE_FAIL;
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}
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$this->length = strlen($matches[0]);
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$this->match = $matches[0];
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$this->number = $number;
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$this->suffix = array_key_exists('suffix', $matches) ? $matches['suffix'] : null;
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return ($pos + $this->length < strlen($source)) ? self::PARSE_SUCCESS_CONT : self::PARSE_SUCCESS;
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}
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/**
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* Calculate value of parsed number in a decimal notation.
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*
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* @return float
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*/
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public function calcValue(): float {
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$number = (float) $this->number;
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if ($this->suffix !== null) {
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$number *= $this->suffix_multipliers[$this->suffix];
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}
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return $number;
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}
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/**
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* Get suffix of parsed number.
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*
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* @return string|null
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*/
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public function getSuffix(): ?string {
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return $this->suffix;
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}
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}
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