> Have you coded the lexer/parser from scratch Yes. Here is the lexer: https://github.com/rochus-keller/BUSY/blob/main/bslex.c https://github.com/rochus-keller

> Have you coded the lexer/parser from scratch Yes. Here is the lexer: https://github.com/rochus-keller/BUSY/blob/main/bslex.c https://github.com/rochus-keller/BUSY/blob/main/bslex.c and here is the parser: https://github.com/rochus-keller/BUSY/blob/main/bsparser.c https://github.com/rochus-keller/BUSY/blob/main/bsparser.c and here is the language specification: http://software.rochus-keller.ch/busy_spec.html http://software.rochus-keller.ch/busy_spec.html I also developed and checked the EBNF in parallel using my EbnfStudio tool; this tool could also generate a parser, but since I'm using much of the Lua VM infrastructure a manual parser implementation was more straight-forward .