I haven't been on a decent compiler course, for the most, I taught myself. I find that I constantly invent mini languages. For instance, I do a lot with times

I haven't been on a decent compiler course, for the most, I taught myself. I find that I constantly invent mini languages. For instance, I do a lot with timeseries data, and do a lot with bringing in all kinds of external sources of data in many weird formats, so I have a simple data transfomation language that deals with 90% of the scenarios I encouter. Also have a various device simulation languages for describing various sensors and their interfaces, eg SDI12 with it's various timing constraints and sequences. As part of a broader embedded board based testing system the mini language is used to say how you want a sensor to be simulated and then you can execute tests to ensure things work