[Form][Locale] Implemented LocaleField and added script for updating ICU data

src/Symfony/Component/Form/LocaleField.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Symfony\Component\Form;
+
+use Symfony\Component\Locale\Locale;
+
+/**
+ * A field for selecting from a list of locales
+ *
+ * @author Bernhard Schussek <bernhard.schussek@symfony-project.com>
+ */
+class LocaleField extends ChoiceField
+{
+    /**
+     * @inheritDoc
+     */
+    protected function configure()
+    {
+        $this->addOption('choices', Locale::getDisplayLocales($this->locale));
+
+        parent::configure();
+    }
+}

src/Symfony/Component/Locale/Locale.php

@@ -25,6 +25,12 @@ class Locale extends \Locale
      */
     protected static $languages = array();
 
+    /**
+     * Caches the different locales
+     * @var array
+     */
+    protected static $locales = array();
+
     /**
      * Returns the country names for a locale
      *
@@ -116,4 +122,46 @@ class Locale extends \Locale
     {
         return array_keys(self::getDisplayLanguages(self::getDefault()));
     }
+
+    /**
+     * Returns the locale names for a locale
+     *
+     * @param  string $locale     The locale to use for the locale names
+     * @return array              The locale names with their codes as keys
+     * @throws RuntimeException   When the resource bundles cannot be loaded
+     */
+    public static function getDisplayLocales($locale)
+    {
+        if (!isset(self::$locales[$locale])) {
+            $bundle = new \ResourceBundle($locale, __DIR__.'/Resources/data/names');
+
+            if (null === $bundle) {
+                throw new \RuntimeException('The locale resource bundle could not be loaded');
+            }
+
+            $collator = new \Collator($locale);
+            $locales = array();
+
+            foreach ($bundle->get('Locales') as $code => $name) {
+                $locales[$code] = $name;
+            }
+
+            $collator->asort($locales);
+
+            self::$locales[$locale] = $locales;
+        }
+
+        return self::$locales[$locale];
+    }
+
+    /**
+     * Returns all available locale codes
+     *
+     * @return array              The locale codes
+     * @throws RuntimeException   When the resource bundles cannot be loaded
+     */
+    public static function getLocales()
+    {
+        return array_keys(self::getDisplayLocales(self::getDefault()));
+    }
 }

src/Symfony/Component/Locale/Resources/data/UPDATE.txt

@@ -5,13 +5,9 @@ How to update the ICU data
 
    $ svn co http://source.icu-project.org/repos/icu/icu/trunk/source/data icu-data
 
-2. Build the region resource bundles
+2. Execute the build script
 
-   $ cd icu-data/region
-   $ mkdir build
-   $ genrb -d build *.txt
-   
-3a. Replace the *.res files bundled with Symfony2 with the new ones.
+   $ php update-data.php /path/to/icu-data
 
 .dat-package
 ------------