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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\Console\Helper;
  13  
  14  /**
  15   * Helper is the base class for all helper classes.
  16   *
  17   * @author Fabien Potencier <fabien@symfony.com>
  18   */
  19  abstract class Helper implements HelperInterface
  20  {
  21      protected $helperSet = null;
  22  
  23      /**
  24       * Sets the helper set associated with this helper.
  25       *
  26       * @param HelperSet $helperSet A HelperSet instance
  27       */
  28      public function setHelperSet(HelperSet $helperSet = null)
  29      {
  30          $this->helperSet = $helperSet;
  31      }
  32  
  33      /**
  34       * Gets the helper set associated with this helper.
  35       *
  36       * @return HelperSet A HelperSet instance
  37       */
  38      public function getHelperSet()
  39      {
  40          return $this->helperSet;
  41      }
  42  
  43      /**
  44       * Returns the length of a string, using mb_strwidth if it is available.
  45       *
  46       * @param string $string The string to check its length
  47       *
  48       * @return int The length of the string
  49       */
  50      protected function strlen($string)
  51      {
  52          if (!function_exists('mb_strwidth')) {
  53              return strlen($string);
  54          }
  55  
  56          if (false === $encoding = mb_detect_encoding($string, null, true)) {
  57              return strlen($string);
  58          }
  59  
  60          return mb_strwidth($string, $encoding);
  61      }
  62  }