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NumberComparator.php
01 <?php
02
03 /*
04 * This file is part of the Symfony package.
05 *
06 * (c) Fabien Potencier <fabien@symfony.com>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace Symfony\Component\Finder\Comparator;
13
14 /**
15 * NumberComparator compiles a simple comparison to an anonymous
16 * subroutine, which you can call with a value to be tested again.
17 *
18 * Now this would be very pointless, if NumberCompare didn't understand
19 * magnitudes.
20 *
21 * The target value may use magnitudes of kilobytes (k, ki),
22 * megabytes (m, mi), or gigabytes (g, gi). Those suffixed
23 * with an i use the appropriate 2**n version in accordance with the
24 * IEC standard: http://physics.nist.gov/cuu/Units/binary.html
25 *
26 * Based on the Perl Number::Compare module.
27 *
28 * @author Fabien Potencier <fabien@symfony.com> PHP port
29 * @author Richard Clamp <richardc@unixbeard.net> Perl version
30 * @copyright 2004-2005 Fabien Potencier <fabien@symfony.com>
31 * @copyright 2002 Richard Clamp <richardc@unixbeard.net>
32 *
33 * @see http://physics.nist.gov/cuu/Units/binary.html
34 */
35 class NumberComparator extends Comparator
36 {
37 /**
38 * @param string|int $test A comparison string or an integer
39 *
40 * @throws \InvalidArgumentException If the test is not understood
41 */
42 public function __construct($test)
43 {
44 if (!preg_match('#^\s*(==|!=|[<>]=?)?\s*([0-9\.]+)\s*([kmg]i?)?\s*$#i', $test, $matches)) {
45 throw new \InvalidArgumentException(sprintf('Don\'t understand "%s" as a number test.', $test));
46 }
47
48 $target = $matches[2];
49 if (!is_numeric($target)) {
50 throw new \InvalidArgumentException(sprintf('Invalid number "%s".', $target));
51 }
52 if (isset($matches[3])) {
53 // magnitude
54 switch (strtolower($matches[3])) {
55 case 'k':
56 $target *= 1000;
57 break;
58 case 'ki':
59 $target *= 1024;
60 break;
61 case 'm':
62 $target *= 1000000;
63 break;
64 case 'mi':
65 $target *= 1024 * 1024;
66 break;
67 case 'g':
68 $target *= 1000000000;
69 break;
70 case 'gi':
71 $target *= 1024 * 1024 * 1024;
72 break;
73 }
74 }
75
76 $this->setTarget($target);
77 $this->setOperator(isset($matches[1]) ? $matches[1] : '==');
78 }
79 }
80