79 lines
2.5 KiB
PHP
79 lines
2.5 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Finder\Comparator;
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/**
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* NumberComparator 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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* @author Fabien Potencier <fabien@symfony.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@symfony.com>
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* @copyright 2002 Richard Clamp <richardc@unixbeard.net>
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*
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* @see http://physics.nist.gov/cuu/Units/binary.html
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*/
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class NumberComparator extends Comparator
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{
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/**
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* @param string|null $test A comparison string or null
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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 __construct(?string $test)
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{
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if (null === $test || !preg_match('#^\s*(==|!=|[<>]=?)?\s*([0-9\.]+)\s*([kmg]i?)?\s*$#i', $test, $matches)) {
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throw new \InvalidArgumentException(\sprintf('Don\'t understand "%s" as a number test.', $test ?? 'null'));
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}
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$target = $matches[2];
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if (!is_numeric($target)) {
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throw new \InvalidArgumentException(\sprintf('Invalid number "%s".', $target));
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}
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if (isset($matches[3])) {
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// magnitude
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switch (strtolower($matches[3])) {
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case 'k':
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$target *= 1000;
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break;
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case 'ki':
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$target *= 1024;
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break;
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case 'm':
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$target *= 1000000;
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break;
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case 'mi':
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$target *= 1024 * 1024;
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break;
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case 'g':
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$target *= 1000000000;
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break;
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case 'gi':
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$target *= 1024 * 1024 * 1024;
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break;
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}
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}
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parent::__construct($target, $matches[1] ?: '==');
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}
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}
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