Inspired by Bert Freudenberg, Ian Piumarta, and Walter Bender, I started hacking on "Turtles All The Way Down" (aka TurtleScript) on the plane back from Uruguay.
Now there's a nice rendering demo to show what a tile-based editor for JavaScript might look like, as well as a bytecode compiler and interpreter for the language. The bytecode instruction set is still too large; encouraged by Craig Chambers' work on SELF I think I ought to be able to replace all the unary and binary operators, conditional jumps, and slot selectors by a single mapof operator. I can put a better object model on the interpreter, too;
I've written some notes on the matter.
The question is: does this really have educational value? "Turtles all the way down" is a great slogan, and a fine way to teach a graduate-level class on compiler technology, but I feel that the higher-level UI for tile-based program editing is the really useful thing for tablet computing. I'm a compiler geek and love the grungy underbelly of this stuff, but I keep reminding myself I should really be spending more time building a beautiful fluffy surface.