You might also be interested in an old thread http://www.jsoftware.com/pipermail/general/2001-November/008262.html and http://www.jsoftware.com/pipermail/general/2001-December/008595.html You should be able to imply the tree type description for an early version of J from the source of its implementation: http://www.math.uwaterloo.ca/apl_archives/j/early_j/src/j7/ (J source including LinkJ) and this task would be a lot easier if you could get a copy of the “An Implementation of J” (1992) yellow spiral bounded booklet. An alternative to a write a J interpreter in J could be to write a J program that generates a J interpreter; for example, a J program that writes (and compiles) the source of a J interpreter in C. Then, of course, it would be possible to at least match the performance of the current J interpreter. Would not be neat to write a description of J in J as input for a J program that generates a J interpreter from that description (see http://www.jsoftware.com/pipermail/programming/2009-July/015481.html for a hint)? That is easy for me to say since I have not compiled for decades a program written in a familiar programming language.
________________________________ From: Ian Clark <[email protected]> To: Programming forum <[email protected]> Sent: Saturday, July 25, 2009 4:05:33 PM Subject: Re: [Jprogramming] Reimplementing J > Can I play too? I've been meaning to do this for years, but I never got up > the initiative. If you start the project I'm happy Delighted to have a co-worker (=player). Will keep you up-to-date. Thanks for the leads. Itching to get started. Must get APWJ Edn 2 tested & released first, though. Irresponsible to get sidetracked. Ian On 7/25/09, Dan Bron <[email protected]> wrote: > > Does Dan's list have any official standing? > > > Nope. BTW, I am not the only contributor to the list: Oleg and others have > added definitions as well. (Some without knowing it, > as I steal their Forum code and post it there.) > > PrimitivePrimitives is really just a fun side-project. As a symptom of that, >you'll notice that many primitives are missing, even > those with trivial implementations. Further, you'll notice many >reimplementations have limited domains. This is because I really > focus on the "interesting" or "fun" relationships between primitives. > > > > building myself a working J emulator > > > Can I play too? I've been meaning to do this for years, but I never got up > the initiative. If you start the project I'm happy > (enthused) to help. > > Note that you'd have to start at a lower level than primitive definition. >But you can steal "word formation" (lexing) from the > specificiation of monad ;: and you can steal parsing from open'trace' . > > There's plenty of other goodies you might find helpful, e.g. >http://www.jsoftware.com/jwiki/Essays/Rank and > http://www.jsoftware.com/jwiki/Guides/Parsing . > > -Dan > > > PS: I got a kick out of it when you said: > > > being implemented in more primitive primitives > > > in http://www.jsoftware.com/pipermail/programming/2009-July/015493.html > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
