From 56c2b4a24b09f59034d9823f0c011b34cfe5b29d Mon Sep 17 00:00:00 2001
From: Matthias Schmid <matthias@localhost.xoo>
Date: Mon, 2 Mar 2015 16:36:58 +0100
Subject: [PATCH 1/2] added extensions for functions

---
 src/Compiler.php | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/Compiler.php b/src/Compiler.php
index 5d36efbe..90ede9fb 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -1168,7 +1168,11 @@ protected function reduce($value, $inExp = false)
                 // user defined function?
                 $func = $this->get(self::$namespaces['function'] . $name, false);
 
-                if ($func) {
+				if ($this->isScssExtension($func)) {
+					return $this->executeScssExtension($func, $argValues);
+
+				} else if ($func) {
+
                     $this->pushEnv();
 
                     // set the args
@@ -1209,6 +1213,41 @@ protected function reduce($value, $inExp = false)
         }
     }
 
+	private $extensions = array();
+
+	/**
+	 * @param string $extKey
+	 * @param $extension
+	 */
+	public function addExtension($extKey, $extension)
+	{
+		$this->extensions[$extKey] = $extension;
+	}
+
+	/**
+	 * @param stdClass $func
+	 * @param $argValues
+	 * @return mixed
+	 */
+	private function executeScssExtension($func, $argValues)
+	{
+//		$this->pushEnv();
+//		if (isset($func->args)) {
+//			$this->applyArguments($func->args, $argValues);
+//		}
+
+		$callable = $this->extensions[$func->name];
+
+//		$this->popEnv();
+
+		return $callable($argValues);
+	}
+
+	private function isScssExtension($func)
+	{
+		return array_key_exists($func->name, $this->extensions);
+	}
+
     public function normalizeValue($value)
     {
         $value = $this->coerceForExpression($this->reduce($value));

From 2c1331f7fb6299a11a6b365baf9f1ce681b21b4b Mon Sep 17 00:00:00 2001
From: Matthias Schmid <matthias@localhost.xoo>
Date: Mon, 2 Mar 2015 16:52:10 +0100
Subject: [PATCH 2/2] fixed isScssExtension()

---
 src/Compiler.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Compiler.php b/src/Compiler.php
index 90ede9fb..8afe7c54 100644
--- a/src/Compiler.php
+++ b/src/Compiler.php
@@ -1245,7 +1245,7 @@ private function executeScssExtension($func, $argValues)
 
 	private function isScssExtension($func)
 	{
-		return array_key_exists($func->name, $this->extensions);
+		return (false !== $func) && array_key_exists($func->name, $this->extensions);
 	}
 
     public function normalizeValue($value)