<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Finder\Comparator;

/**
* NumberComparator compiles a simple comparison to an anonymous
* subroutine, which you can call with a value to be tested again.
*
* Now this would be very pointless, if NumberCompare didn't understand
* magnitudes.
*
* The target value may use magnitudes of kilobytes (k, ki),
* megabytes (m, mi), or gigabytes (g, gi). Those suffixed
* with an i use the appropriate 2**n version in accordance with the
* IEC standard: http://physics.nist.gov/cuu/Units/binary.html
*
* Based on the Perl Number::Compare module.
*
* @author Fabien Potencier <fabien@symfony.com> PHP port
* @author Richard Clamp <richardc@unixbeard.net> Perl version
* @copyright 2004-2005 Fabien Potencier <fabien@symfony.com>
* @copyright 2002 Richard Clamp <richardc@unixbeard.net>
*
* @see http://physics.nist.gov/cuu/Units/binary.html
*/
class NumberComparator extends Comparator
{
/**
* @param string|null $test A comparison string or null
*
* @throws \InvalidArgumentException If the test is not understood
*/
public function __construct(?string $test)
{
if (null === $test || !preg_match('#^\s*(==|!=|[<>]=?)?\s*([0-9\.]+)\s*([kmg]i?)?\s*$#i', $test, $matches)) {
throw new \InvalidArgumentException(sprintf('Don\'t understand "%s" as a number test.', $test ?? 'null'));
}

$target = $matches[2];
if (!is_numeric($target)) {
throw new \InvalidArgumentException(sprintf('Invalid number "%s".', $target));
}
if (isset($matches[3])) {
// magnitude
switch (strtolower($matches[3])) {
case 'k':
$target *= 1000;
break;
case 'ki':
$target *= 1024;
break;
case 'm':
$target *= 1000000;
break;
case 'mi':
$target *= 1024 * 1024;
break;
case 'g':
$target *= 1000000000;
break;
case 'gi':
$target *= 1024 * 1024 * 1024;
break;
}
}

parent::__construct($target, $matches[1] ?: '==');
}
}