Fix extraction process

yvi/exceptions.py

@@ -9,7 +9,16 @@ class UnknownConnectionError(Exception):
     pass
 
 
-class VideoInfoParseException(Exception):
+class VideoInfoParseError(Exception):
     '''
     thrown when failed to parse video info
     '''
+
+
+class PatternUnmatchError(VideoInfoParseError):
+    '''
+    thrown when failed to parse video info with unmatched pattern
+    '''
+    def __init__(self, doc):
+        self.msg = "PatternUnmatchError"
+        self.doc = doc

yvi/yvi.py

@@ -98,14 +98,13 @@ class VideoInfo:
 
     def _parse(self, text):
         result = re.search(pattern, text)
-        gr = result.group(1)
+        if result is None:
-        if gr is None:
             raise VideoInfoParseException("Failed to parse video info.")
-        self._res = json.loads(gr[:-1])
+        decoder = json.JSONDecoder()
+        self._res = decoder.raw_decode(result.group(1)[:-1])[0]
         response = self._get_item(self._res, item_response)
         if response is None:
             self._check_video_is_private(self._res.get("args"))
-        
         self._renderer = self._get_item(json.loads(response), item_renderer)
         if self._renderer is None:
             raise InvalidVideoIdException(