Filter invalid file types and use default list as fallback

src/Indexer.php

@@ -112,7 +112,7 @@ class Indexer
     public function index(): Promise
     {
         return coroutine(function () {
-            $fileTypes = implode(',', $this->options->fileTypes);
+            $fileTypes = implode(',', $this->options->getFileTypes());
             $pattern = Path::makeAbsolute('**/*{' . $fileTypes . '}', $this->rootPath);
             $uris = yield $this->filesFinder->find($pattern);
 

src/Options.php

@@ -9,29 +9,67 @@ class Options
      *
      * @var array
      */
-    public $fileTypes = [".php"];
+    private $fileTypes = [".php"];
 
     /**
-     * @param \stdClass|null $options
+     * @param \Traversable|\stdClass|array|null $options
      */
-    public function __construct(\stdClass $options = null)
+    public function __construct($options = null)
     {
         // Do nothing when the $options parameter is not an object
-        if (!is_object($options)) {
+        if (!is_object($options) && !is_array($options) && (!$options instanceof \Traversable)) {
             return;
         }
 
-        $this->fileTypes = $options->fileTypes ?? $this->normalizeFileTypes($this->fileTypes);
+        foreach ($options as $option => $value) {
+            $method = 'set' . ucfirst($option);
+
+            call_user_func([$this, $method], $value);
+        }
     }
 
-    private function normalizeFileTypes(array $fileTypes): array
+    /**
+     * Validate and set options for file types
+     *
+     * @param array $fileTypes List of file types
+     */
+    public function setFileTypes(array $fileTypes)
     {
-        return array_map(function (string $fileType) {
+        $fileTypes = filter_var_array($fileTypes, FILTER_SANITIZE_STRING);
+        $fileTypes =  filter_var($fileTypes, FILTER_CALLBACK, ['options' => [$this, 'filterFileTypes']]);
+        $fileTypes = array_filter($fileTypes);
+
+        $this->fileTypes = !empty($fileTypes) ? $fileTypes : $this->fileTypes;
+    }
+
+    /**
+     * Get list of registered file types
+     *
+     * @return array
+     */
+    public function getFileTypes(): array
+    {
+        return $this->fileTypes;
+    }
+
+    /**
+     * Filter valid file type
+     *
+     * @param string $fileType The file type to filter
+     * @return string|bool If valid it returns the file type, otherwise false
+     */
+    private function filterFileTypes(string $fileType)
+    {
+        $fileType = trim($fileType);
+
+        if (empty($fileType)) {
+            return $fileType;
+        }
+
         if (substr($fileType, 0, 1) !== '.') {
-                $fileType = '.' . $fileType;
+            return false;
         }
 
         return $fileType;
-        }, $fileTypes);
     }
 }