110 lines
2.7 KiB
PHP
110 lines
2.7 KiB
PHP
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<?php
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namespace Symfony\Components\Finder;
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/*
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* This file is part of the Symfony framework.
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*
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* (c) Fabien Potencier <fabien.potencier@symfony-project.com>
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*
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* This source file is subject to the MIT license that is bundled
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* with this source code in the file LICENSE.
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*/
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/**
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* NumberCompare compiles a simple comparison to an anonymous
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* subroutine, which you can call with a value to be tested again.
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*
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* Now this would be very pointless, if NumberCompare didn't understand
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* magnitudes.
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*
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* The target value may use magnitudes of kilobytes (k, ki),
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* megabytes (m, mi), or gigabytes (g, gi). Those suffixed
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* with an i use the appropriate 2**n version in accordance with the
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* IEC standard: http://physics.nist.gov/cuu/Units/binary.html
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*
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* Based on the Perl Number::Compare module.
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*
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* @package Symfony
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* @subpackage Components_Finder
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* @author Fabien Potencier <fabien.potencier@symfony-project.com> PHP port
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* @author Richard Clamp <richardc@unixbeard.net> Perl version
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* @copyright 2004-2005 Fabien Potencier <fabien.potencier@symfony-project.com>
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* @copyright 2002 Richard Clamp <richardc@unixbeard.net>
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* @see http://physics.nist.gov/cuu/Units/binary.html
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*/
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class NumberCompare
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{
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protected $target;
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protected $comparison;
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/**
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* Constructor.
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*
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* @param string $test A comparison string
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*/
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public function __construct($test)
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{
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if (!preg_match('#^\s*([<>=]=?)?\s*([0-9\.]+)\s*([kmg]i?)?\s*$#i', $test, $matches))
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{
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throw new \InvalidArgumentException(sprintf('Don\'t understand "%s" as a test.', $test));
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}
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$this->target = $matches[2];
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$this->comparison = isset($matches[1]) ? $matches[1] : '==';
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$magnitude = strtolower(isset($matches[3]) ? $matches[3] : '');
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switch ($magnitude)
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{
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case 'k':
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$this->target *= 1000;
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break;
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case 'ki':
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$this->target *= 1024;
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break;
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case 'm':
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$this->target *= 1000000;
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break;
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case 'mi':
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$this->target *= 1024*1024;
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break;
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case 'g':
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$this->target *= 1000000000;
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break;
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case 'gi':
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$this->target *= 1024*1024*1024;
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break;
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}
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}
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/**
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* Tests a number against the test.
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*
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* @throws \InvalidArgumentException If the test is not understood
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*/
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public function test($number)
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{
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if ($this->comparison === '>')
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{
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return ($number > $this->target);
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}
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if ($this->comparison === '>=')
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{
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return ($number >= $this->target);
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}
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if ($this->comparison === '<')
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{
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return ($number < $this->target);
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}
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if ($this->comparison === '<=')
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{
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return ($number <= $this->target);
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}
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return ($number == $this->target);
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}
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}
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