[dukoid]

I was assuming it's something similar to PL/0 but the grammar looks quite extensive...

[Joker_vD]

Basically Algol, but with gratuitous "SET" to simplify parsing assignment statements, and without generic "BEGIN" braces: those are baked into "DO"/"THEN"/"ELSE".

You can probably straightforwardly translate it to Golang by running through a C preprocessor with an obvious set of macros.