add check for some invalid data

clj.py

@@ -98,7 +98,11 @@ def __read_token(self):
         ## skip all stop chars if necessary 
         while c in self.stop_chars:
             c = fd.read(1)
-
+
+        ## raise exception when unexpected EOF found
+        if c == '':
+            raise ValueError("Unexpected EOF")
+
         t, coll = self.__get_type_from_char(c)
         if coll:
             ## move cursor 

tests/clj-test.py

@@ -48,6 +48,10 @@ def test_all_data(self):
         for k,v in self.data.items():
             self.assertEqual(k, clj.dumps(v))
 
+    def test_misformed_data(self):
+        data = "[1 2 3"
+        self.assertRaises(ValueError, clj.loads, data)
+
 
 if __name__ == '__main__':
     unittest.main()