[DependencyInjection] removed obsolete code

src/Symfony/Component/DependencyInjection/Extension/Extension.php

@@ -1,95 +0,0 @@
-<?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\DependencyInjection\Extension;
-
-use Symfony\Component\DependencyInjection\ContainerBuilder;
-
-/**
- * Extension is a helper class that helps organize extensions better.
- *
- * @author Fabien Potencier <fabien@symfony.com>
- */
-abstract class Extension implements ExtensionInterface
-{
-    /**
-     * This method normalizes keys between the different configuration formats
-     *
-     * Namely, you mostly have foo_bar in YAML while you have foo-bar in XML.
-     * After running this method, all keys are normalized to foo_bar.
-     *
-     * If you have a mixed key like foo-bar_moo, it will not be altered.
-     * The key will also not be altered if the target key already exists.
-     *
-     * @param array $config
-     *
-     * @return array the config with normalized keys
-     */
-    public static function normalizeKeys(array $config)
-    {
-        foreach ($config as $key => $value) {
-            if (is_array($value)) {
-                $config[$key] = self::normalizeKeys($value);
-            }
-
-            if (false !== strpos($key, '-') && false === strpos($key, '_') && !array_key_exists($normalizedKey = str_replace('-', '_', $key), $config)) {
-                $config[$normalizedKey] = $config[$key];
-                unset($config[$key]);
-            }
-        }
-
-        return $config;
-    }
-
-    /**
-     * Normalizes a configuration entry.
-     *
-     * This method returns a normalize configuration array for a given key
-     * to remove the differences due to the original format (YAML and XML mainly).
-     *
-     * Here is an example.
-     *
-     * The configuration is XML:
-     *
-     * <twig:extension id="twig.extension.foo" />
-     * <twig:extension id="twig.extension.bar" />
-     *
-     * And the same configuration in YAML:
-     *
-     * twig.extensions: ['twig.extension.foo', 'twig.extension.bar']
-     *
-     * @param array  $config A config array
-     * @param string $key    The key to normalize
-     * @param string $plural The plural form of the key if it is irregular
-     *
-     * @return array
-     */
-    public static function normalizeConfig($config, $key, $plural = null)
-    {
-        if (null === $plural) {
-            $plural = $key.'s';
-        }
-
-        $values = array();
-        if (isset($config[$plural])) {
-            $values = $config[$plural];
-        } elseif (isset($config[$key])) {
-            if (is_string($config[$key]) || !is_int(key($config[$key]))) {
-                // only one
-                $values = array($config[$key]);
-            } else {
-                $values = $config[$key];
-            }
-        }
-
-        return $values;
-    }
-}