My first commit of codes

vendor/phpunit/php-token-stream/src/Token/Stream/CachingFactory.php

@@ -0,0 +1,52 @@
+<?php
+/*
+ * This file is part of the PHP_TokenStream package.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * A caching factory for token stream objects.
+ *
+ * @author    Sebastian Bergmann <sebastian@phpunit.de>
+ * @copyright Sebastian Bergmann <sebastian@phpunit.de>
+ * @license   http://www.opensource.org/licenses/BSD-3-Clause  The BSD 3-Clause License
+ * @version   Release: @package_version@
+ * @link      http://github.com/sebastianbergmann/php-token-stream/tree
+ * @since     Class available since Release 1.0.0
+ */
+class PHP_Token_Stream_CachingFactory
+{
+    /**
+     * @var array
+     */
+    protected static $cache = array();
+
+    /**
+     * @param  string $filename
+     * @return PHP_Token_Stream
+     */
+    public static function get($filename)
+    {
+        if (!isset(self::$cache[$filename])) {
+            self::$cache[$filename] = new PHP_Token_Stream($filename);
+        }
+
+        return self::$cache[$filename];
+    }
+
+    /**
+     * @param string $filename
+     */
+    public static function clear($filename = NULL)
+    {
+        if (is_string($filename)) {
+            unset(self::$cache[$filename]);
+        } else {
+            self::$cache = array();
+        }
+    }
+}