Campaign AI

I'm working on a personal Campaign for myself and close friends, and I was wondering how to get the computer to use the AI as seen in the official campaigns.
You know, the one so easy I child could beat it; where it ignores creeps (and likewise they ignore the the comp), where it sends very small but gradually growing waves, but never its entire force, where it never expands, uses only the buildings they start with, and don't repair.
The Campaign AI.

If anyone knows where to find it, or how to replicate it, that would be great, because my friends aren't the hardest-core gamers (They can't beat the EASY melee comp.)

Thanks