diff --git a/src/Compiler.php b/src/Compiler.php
index 0be81c6..b977b66 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -57,7 +57,15 @@ function __construct($cacheDir = null, array $paths = [])
         );
     }
 
-    function compile($path, $data = [])
+    function extend($name, callable $handler) {
+        $this->directive($name, $handler);
+    }
+
+    function directive($name, callable $handler) {
+        $this->compiler->directive($name, $handler);
+    }
+
+    function compile($path, array $data = [])
     {
         // If the file can't be found it's probably supplied as a template within
         // one of the base directories
@@ -78,7 +86,7 @@ function compile($path, $data = [])
         );
     }
 
-    function render($path, $data = [])
+    function render($path, array $data = [])
     {
         return $this->compile($path, $data)->render();
     }