--- /dev/null
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Default autoescaping strategy based on file names.
+ *
+ * This strategy sets the HTML as the default autoescaping strategy,
+ * but changes it based on the template name.
+ *
+ * Note that there is no runtime performance impact as the
+ * default autoescaping strategy is set at compilation time.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_FileExtensionEscapingStrategy
+{
+ /**
+ * Guesses the best autoescaping strategy based on the file name.
+ *
+ * @param string $name The template name
+ *
+ * @return string|false The escaping strategy name to use or false to disable
+ */
+ public static function guess($name)
+ {
+ if (in_array(substr($name, -1), array('/', '\\'))) {
+ return 'html'; // return html for directories
+ }
+
+ if ('.twig' === substr($name, -5)) {
+ $name = substr($name, 0, -5);
+ }
+
+ $extension = pathinfo($name, PATHINFO_EXTENSION);
+
+ switch ($extension) {
+ case 'js':
+ return 'js';
+
+ case 'css':
+ return 'css';
+
+ case 'txt':
+ return false;
+
+ default:
+ return 'html';
+ }
+ }
+}