--- /dev/null
+<?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\Console\Helper;
+
+/**
+ * HelperInterface is the interface all helpers must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface HelperInterface
+{
+ /**
+ * Sets the helper set associated with this helper.
+ *
+ * @param HelperSet $helperSet A HelperSet instance
+ */
+ public function setHelperSet(HelperSet $helperSet = null);
+
+ /**
+ * Gets the helper set associated with this helper.
+ *
+ * @return HelperSet A HelperSet instance
+ */
+ public function getHelperSet();
+
+ /**
+ * Returns the canonical name of this helper.
+ *
+ * @return string The canonical name
+ */
+ public function getName();
+}