Added phpdocs

module/Nsautoload/Nsautoload.php

@@ -4,16 +4,30 @@
 
 class Nsautoload
 {
+    /**
+     * Registers this instance as an autoloader
+     * 
+     * @param 	bool 	$prepend
+     */
     public function register($prepend = false)
     {
         spl_autoload_register(array($this, 'loadClass'), true, $prepend);
     }
 
+    /**
+     * Unregisters this instance as an autoloader.
+     */
     public function unregister()
     {
         spl_autoload_unregister(array($this, 'loadClass'));
     }
 
+    /**
+     * Tries to load given class by locating and including its file. 
+     *
+     * @param  string    $class 	The name of the class
+     * @return bool|null 			True if loaded
+     */
     public function loadClass($class)
     {
         $file = $this->findFile($class);
@@ -24,14 +38,26 @@ public function loadClass($class)
         }
     }
 
+    /**
+     * Tries to locate the file where the class is defined.
+     *
+     * @param 	string 		$class 	The name of the class
+     * @return 	string|null 		Location of the file, or null if not found
+     */
     public function findFile($class)
     {
         $class  = ltrim($class,'\\');
 
         $expl   = explode('\\',$class);
-        $module = strtolower(preg_replace('/(?<=\\w)(?=[A-Z])/','_$1', $expl[0]));
+
+        $module = strtolower(preg_replace('/(?<=\\w)(?=[A-Z])/','_$1', reset($expl)));
+
+        if (!module_exists($module)) {
+            return;
+        }
+
         if (2 === count($expl)) {
-            // Locate Foo\Bar in foo/class/bar.class.inc
+            // Locate Foo\Bar in foo/class/bar.class.inc (for BC purposes)
             $className 	= strtolower(end($expl));
             $file		=
                 DRUPAL_ROOT.