fogus / russ-forth

Russforth is a teeny-tiny Forth-esque implementation in Ruby.

Russforth

Russforth is a teeny-tiny Forth implementation in Ruby.

a nicer small-forth is SallyForth by Russ Olsen

It currently supports the following:

• Shuffling words: drop, dup, swap, rot, over, qdup
• Mathematical words: +, -, *, /, min, max
• Stack words: .
• I/O words: emit, cr, .S
• Comments: Skip lines via \

In addition, Russforth allows user defined words via the : operator:

: sq dup * ;
2 sq
.
\ prints 4

Things that I would like to add:

• if ... then
• Literal Blocks (i.e. [pop dup *])
• Add string type
• Combinators
• User-defined immediate words
• Return stack
• ( ... ) style comments
• A standard lib
• A more robust interactive prompt and script slurping
• Navigable lexicon
• Richer types
• Ruby interop (repurposing !, @, etc. and introducing #name, .name, new

More to come.

References and inspirations

• Starting Forth by Leo Brodie
• Thinking Forth by Leo Brodie
• Object-oriented Forth by Dick Pountain
• Scientific Forth by Noble

License

Copyright 2012-2015 Mike Fogus and Russ Olsen.

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

See the LICENSE file for further details.