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   1  <?php
   2  
   3  /*
   4   * This file is part of the Symfony package.
   5   *
   6   * (c) Fabien Potencier <fabien@symfony.com>
   7   *
   8   * For the full copyright and license information, please view the LICENSE
   9   * 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  }