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Not OP, but I don't see why one would need to parse this at all. You can just step through the characters one byte at a time and execute them, using only a stack memory for return addresses to implement the [] behavior. No syntax tree needed.

Thanks! Glad you like it. The sibling comment by majewsky is spot on. There is not much parsing going on. Every character is read one at a time and the turtle's state is changed. Indeed the "[" and "]" commands are implemented with a stack.

The entire implementation is a single HTML page written in plain HTML + JavaScript. The evaluation of the code happens here: <https://github.com/susam/cfr/blob/0.2.0/cfr.html#L204>.

A minimal language for UIs sounds interesting. Can you share any details?

Sure thing! It’s still in early development and doesn’t have an engine yet, but the syntax is about 80% scoped out:

https://matry.design