Free Open-Source Artificial Intelligence

Hi,

I'd like to explore the possibilities of training a LM to learn a specific programming language so he can be used as co-pilot in that context. Language is a niche language (http://pharo.org), and there is no existing model nowadays knowing it (also, I want to make some extra tweaks, once I have it).
Thing is... I have no idea where to start! :)

Any hint where can I learn the ropes?

Thanks!