--- /dev/null
+<?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];
+ }
+}