Mako

Try https://github.com/JohnEarnest/Mako/blob/master/docs/makoBas... and https://github.com/ablevm/able-forth/tree/current In addition to the others mentioned here. It's a shame the able gui was not open sourced.

Not sure that will swing it, have a look at https://github.com/JohnEarnest/Mako/tree/master Which is basically a Forth for games, that runs on the JVM, and in the browser. The issue as I see it, is that you have to have a model of the datastack in your head at all times. That's fine for your own code, but for other people's code, stack diagrams will only take you so far. The ability to scan code, rather than reading it, allow you to mentally drill down when you are ready. Forth requires immersion. Something like https://xorvoid.com/forsp.html I'm guessing is really the bridge. Something that allows variables without being too complex.

Not any sources/overview as such, I just looked at the VM code. So for Mako: https://github.com/JohnEarnest/Mako/blob/master/src/MakoVM.j... Freeforth: https://github.com/dan4thewin/FreeForth2/blob/master/ff.asm Jonesforth: https://github.com/nornagon/jonesforth/blob/master/jonesfort... Stoneknife: https://github.com/kragen/stoneknifeforth/blob/master/tinybo... Retro/Ilo: http://ilo.retroforth.org/ilo.txt Sectorforth:https://github.com/cesarblum/sectorforth/blob/master/sectorf... but see: https://github.com/cesarblum/sectorforth/issues/6 and: https://github.com/cesarblum/sectorforth/issues/8

On a related note, here's a Logo interpreter I implemented many years ago using a dialect of Forth: https://github.com/JohnEarnest/Mako/blob/master/demos/Loko/L...

Some similarities to one of my old projects, MakoVM: https://github.com/JohnEarnest/Mako It is also Forth-based, and has an ecosystem of interesting little games, programs, and libraries. The CPU, GPU, and other IO facilities fit in a little over 200 lines of Java: https://github.com/JohnEarnest/Mako/blob/master/src/MakoVM.j...

I wrote a dungeon-crawling puzzle game based on (and implemented in) Forth called "Forth Warrior": https://github.com/JohnEarnest/Mako/tree/master/games/Warrio... You can play a browser-based build here: http://johnearnest.github.io/Mako.js/?rom=Warrior (Warning: this game quickly gets pretty hard.)

Most of the software written in Forth runs on embedded systems, not user-facing ones. OpenFirmware is based on forth, and was used instead of BIOS for Sun workstations, some Powermacs, and the OLPC, among other devices. On the OLPC it offers a nice debugging interface and educational opportunity.[0] The Wikireader "wikipedia appliance" used forth for their testing harness during manufacturing, and it's possible to write your own applications for the device using it.[1] Forth has been used for control software for a variety of aerospace applications.[2] I have personally used Forth as an interactive testing environment for bringing up new hardware. In one case, I prototyped software for the power management chip in an embedded linux device. I've also written games and programming environments in Forth, both for fun and for use in education

my k interpreter[0] is less than 1000 lines of JS. Big compared to many on this list, but still human-scale. Looking back on it I see many opportunities left to simplify. further back, I wrote a compiler for part of the language described in Dijkstra's A Discipline of Programming in a dialect of forth[1]. one of my colleagues, Stevan Apter, has a number of interesting toy interpreters on his site[2], particularly concatenative languages. [0] https://github.com/JohnEarnest/ok/blob/gh-pages/oK.js [1] https://github.com/JohnEarnest/Mako/blob/master/demos/FiDo.f... [2] http://nsl.com

Of course. You can build whatever functional abstractions you like in Forth. Some time ago I did a number of experiments with lazy generators: https://github.com/JohnEarnest/Mako/blob/master/lib/Algorith... The above dialect uses { } to delimit anonymous inline word definitions. RetroForth has a similar feature, and Factor uses the same syntax for "quotations", which have slightly different semantics but roughly the same meaning.

Chuck Moore wrote a VLSI tool in 500 lines of colorForth that he's used for multiple chips that he's put on production lines: (Site mirror as the original site is gone.) https://colorforth.github.io/vlsi.html John Earnest has a lot of cool things (his work is incredibly underrated), but an example of something he wrote in Forth is Mako, an entire console: https://github.com/JohnEarnest/Mako During the days of the U.S.S.R., the Russians independently discovered Forth in DSSP, an incredibly similar language. Multiple universities were filled with DSSP, and it worked incredibly well for them. Most of the people I know personally who are stopped posting code publicly when Gitorious died, but they're definitely still around. It's a bit like APL, my language of choice: the communities are there, they're just...in hiding.

As another example, here's a simple GC I wrote quite a while ago in Forth: https://github.com/JohnEarnest/Mako/blob/master/lib/Algorith... This one is a precise, copying GC, with a reserved arena for persistent references into garbage-collected objects (in addition to the stacks). Pointers are identified by reserving a high bit in words.

Perhaps you'd enjoy some of my old Forth projects. I designed a portable VM with a Forth-based development toolchain and standard library. Included among the programs I wrote using this system were a variety of compilers and interpreters. FiDo, a tiny JIT compiler: https://github.com/JohnEarnest/Mako/blob/master/demos/FiDo.f... A Logo interpreter: https://github.com/JohnEarnest/Mako/blob/master/demos/Loko/L... A garbage collector used by a number of games and programs: https://github.com/JohnEarnest/Mako/blob/master/lib/Algorith... A custom systems programming language targeting the VM (Java) https://github.com/JohnEarnest/Mako/tree/master/tools/Stroye...