I've recently started modeling some of my domains/potential code designs in Prol...

ramses0 · 2025-11-12T16:26:04 1762964764

I keep wishing for "regex for prolog", ie: being able to (in an arbitrary language) express some functional bits in "prolog-ish", and then be able to ask/query against it.

    let prologBlob = new ProLog()
    prologBlob.add( "a => b" ).add( "b => c" )
    prologBlob.query( "a == c?" ) == True

(not exactly that, but hopefully you get the gist)

There's so much stuff regarding constraints, access control, relationship queries that could be expressed "simply" in prolog and being able to extract out those interior buts for further use in your more traditional programming language would be really helpful! (...at least in my imagination ;-)

shawn_w · 2025-11-12T18:21:30 1762971690

You can do that in Racket, with the Racklog library¹. There's also Datalog² and MiniKanren and probably some other logic languages available.

[1] https://docs.racket-lang.org/racklog/index.html

[2] https://docs.racket-lang.org/datalog/index.html

dragonwriter · 2025-11-12T17:01:32 1762966892

While usually using native syntax rather than strings, somethign like that exists for most languages of any popularity (and many obscure ones), in the form of miniKanren implementations.

https://minikanren.org/

dragonwriter · 2025-11-12T19:41:12 1762976472

If you really want something that takes Prolog strings instead (and want the full power of prolog), then there are bindings to prolog interpreters from many languages, and also SWI-Prolog specifically provides a fairly straightforward JSON-based server mode "Machine Query Interface" that should be fairly simple to interface with any language.

https://www.swi-prolog.org/pldoc/man?section=mqi-overview

dflock · 2025-11-12T17:00:24 1762966824

There are a bunch of libraries that will do this - here's one example of a python one: https://github.com/yuce/pyswip - and a ruby one: https://github.com/preston/ruby-prolog

ramses0 · 2025-11-12T18:20:17 1762971617

Thanks for the reference! `pyswip` is the closest I've seen so far:

    pl.consult("some-facts.pl")
    pl.assertz("new(fact)")
    while pl.Query(...).nextSolution():
        print( X.value )

...will definitely keep it in my back pocket!

dragonwriter · 2025-11-12T19:28:07 1762975687

pyswip is a one-way python-to-SWI-prolog interface; there's also a first-party (maintained as part of SWI-prolog), two-way one called janus-swi.

https://pypi.org/project/janus-swi/

https://www.swi-prolog.org/pldoc/man?section=janus-call-prol...

svieira · 2025-11-12T17:13:33 1762967613

You might be interested in Flix:

https://play.flix.dev/?q=PQgECUFMBcFcCcB2BnUBDUBjA9gG15JtAJb...

is an embedded Datalog DB and query in a general-purpose programming language.

More examples on https://flix.dev/

tejtm · 2025-11-12T19:06:23 1762974383

You could try picat

[0] https://picat-lang.org/

jll29 · 2025-11-12T18:57:20 1762973840

What you mean is not "regex for Prolog" but an embedded PROLOG interpreter, which exists.

Ironically, the most common way I have seen people do this is use an embedded LISP interpreter, in which a small PROLOG is easily implemented.

https://www.metalevel.at/lisprolog/ suggests Lisprolog (Here are some embedded LISPs: ECL, PicoLisp, tulisp)

SWI-Prolog can also be linked against C/C++ code: https://stackoverflow.com/questions/65118493/is-there-any-re... https://sourceforge.net/p/gprolog/code/ci/457f7b447c2b9e90a0...

Racklog is an embedded PROLOG for Racket (Scheme): https://docs.racket-lang.org/racklog/

zemptime · 2025-11-12T16:53:36 1762966416

I've wished for the same kind of 'embed prolog in my ruby' for enumerating all possible cases, all invalid cases, etc in test suites. Interesting to know it's not just me!

naasking · 2025-11-12T16:59:05 1762966745

Maybe try a Ruby Kanren implementation:

https://minikanren.org/

uKanren is conceptually small and simple, here's a Ruby implementation: https://github.com/jsl/ruby_ukanren

dflock · 2025-11-12T17:01:24 1762966884

There are a bunch of libraries that will do this - here's one example of a python one: https://github.com/yuce/pyswip - and a ruby one: https://github.com/preston/ruby-prolog

zemptime · 2025-11-12T17:15:44 1762967744

I did try ruby-prolog. The deeper issue is that its just not prolog. Writing in actual prolog affords a lot of clarity and concision which would be quite noisy in ruby-prolog. To me, the difference was stark enough it wasn't worth any convenience already being in ruby was worth.

dragonwriter · 2025-11-13T17:35:45 1763055345

Porolog might be more to your liking.

https://www.rubydoc.info/gems/porolog#porolog-wiki

elxr · 2025-11-12T22:06:37 1762985197

I wonder if there's examples of whole product architectures done in Prolog, seems like an elegant solution if done right. I've been looking for a concise way to model full architectures of my various projects, without relying on having a typical markdown file.

Which is separate from the actual types in the code.

Which is separate from the deployment section of the docs.