@amca It was the language of the Breeze suite.
But the custom predicteds was really C and Yacc. Either Berkeley Yacc or MKS Yacc would work fine, but we paid for the latter so I used it. This was on MSDOS, but MKS Yacc is still around, and Berkeley Yacc is the best Yacc. Bison is a disappointing Yacc. Same guy wrote it as Berkeley Yacc and he learned from his mistakes.
I used gperf for lexing. No damn REs for me.
It compiles to a virtual stack machine. I used my FORTH experience.
@chemoelectric Forth! ❤️