text: <?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\Translation;
  
  /**
   * MessageSelector.
   *
   * @author Fabien Potencier <fabien@symfony.com>
   * @author Bernhard Schussek <bschussek@gmail.com>
   */
  class MessageSelector
  {
      /**
       * Given a message with different plural translations separated by a
       * pipe (|), this method returns the correct portion of the message based
       * on the given number, locale and the pluralization rules in the message
       * itself.
       *
       * The message supports two different types of pluralization rules:
       *
       * interval: {0} There are no apples|{1} There is one apple|]1,Inf] There are %count% apples
       * indexed:  There is one apple|There are %count% apples
       *
       * The indexed solution can also contain labels (e.g. one: There is one apple).
       * This is purely for making the translations more clear - it does not
       * affect the functionality.
       *
       * The two methods can also be mixed:
       *     {0} There are no apples|one: There is one apple|more: There are %count% apples
       *
       * @param string $message The message being translated
       * @param int    $number  The number of items represented for the message
       * @param string $locale  The locale to use for choosing
       *
       * @return string
       *
       * @throws \InvalidArgumentException
       */
      public function choose($message, $number, $locale)
      {
          $parts = explode('|', $message);
          $explicitRules = array();
          $standardRules = array();
          foreach ($parts as $part) {
              $part = trim($part);
  
              if (preg_match('/^(?P<interval>'.Interval::getIntervalRegexp().')\s*(?P<message>.*?)$/xs', $part, $matches)) {
                  $explicitRules[$matches['interval']] = $matches['message'];
              } elseif (preg_match('/^\w+\:\s*(.*?)$/', $part, $matches)) {
                  $standardRules[] = $matches[1];
              } else {
                  $standardRules[] = $part;
              }
          }
  
          // try to match an explicit rule, then fallback to the standard ones
          foreach ($explicitRules as $interval => $m) {
              if (Interval::test($number, $interval)) {
                  return $m;
              }
          }
  
          $position = PluralizationRules::get($number, $locale);
  
          if (!isset($standardRules[$position])) {
              // when there's exactly one rule given, and that rule is a standard
              // rule, use this rule
              if (1 === count($parts) && isset($standardRules[0])) {
                  return $standardRules[0];
              }
  
              throw new \InvalidArgumentException(sprintf('Unable to choose a translation for "%s" with locale "%s" for value "%d". Double check that this translation has the correct plural options (e.g. "There is one apple|There are %%count%% apples").', $message, $locale, $number));
          }
  
          return $standardRules[$position];
      }
  }
  