Converting a simple Pine script (TradingView) to MQ4

Hello,

I have this Bollinger bands indictor with some changes and I want to convert it to .mq4.

The code is very simple and straight forward.

Input:

1. Period length (int): Default 50
2. Source: Default: Close; Open, High, Low, Close
3. standard deviation (float): Default 2
4. Offset: default 0.