[Form] Implemented LanguageField

src/Symfony/Component/Form/LanguageField.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace Symfony\Component\Form;
+
+/**
+ * A field for selecting from a list of languages
+ *
+ * @author Bernhard Schussek <bernhard.schussek@symfony-project.com>
+ */
+class LanguageField extends ChoiceField
+{
+    /**
+     * Caches the language choices in different locales
+     * @var array
+     */
+    protected static $languages;
+
+    /**
+     * @inheritDoc
+     */
+    protected function configure()
+    {
+        $this->addOption('choices', self::getLanguageChoices($this->locale));
+
+        parent::configure();
+    }
+
+    /**
+     * Returns the list of languages for a locale
+     *
+     * @param string $locale     The locale to use for the language names
+     * @throws RuntimeException  When the resource bundles cannot be loaded
+     */
+    protected static function getLanguageChoices($locale)
+    {
+        if (!isset(self::$languages[$locale])) {
+            $bundle = new \ResourceBundle($locale, __DIR__.'/Resources/data/lang');
+
+            if ($bundle === null) {
+                throw new RuntimeException('The language resource bundle could not be loaded');
+            }
+
+            $collator = new \Collator($locale);
+            $languages = array();
+
+            foreach ($bundle->get('Languages') as $code => $name) {
+                // "mul" is the code for multiple languages
+                if ($code !== 'mul') {
+                    $languages[$code] = $name;
+                }
+            }
+
+            $collator->asort($languages);
+
+            self::$languages[$locale] = $languages;
+        }
+
+        return self::$languages[$locale];
+    }
+}