ciao
trealla
ciao | trealla | |
---|---|---|
3 | 13 | |
243 | 232 | |
2.1% | 2.6% | |
8.8 | 10.0 | |
2 months ago | 6 days ago | |
Prolog | C | |
GNU Lesser General Public License v3.0 only | MIT License |
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ciao
- PHP: Prolog Home Page
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An embeddable Prolog scripting language for Go
Some Prolog systems (like Ciao Prolog https://github.com/ciao-lang/ciao/blob/master/core/lib/forei...) implement bidirectional foreign interfaces. Once you have C bindings it is easy to write bindings from Rust, C++, or any other language (that can interoperate with C). I give here some details about Ciao because this is the system I know better but it should be similar for other popular Prolog implementations.
The tradeoffs depend on the complexity of the Prolog code and your needs for performance and features: pure LP, Prolog (search+unification+cut), garbage collection, dynamic database updates, constraint domains, etc. The Ciao Prolog engine is around 300-400KB. Adding a few libraries, compiler, etc. it goes to 2MB. Naive Prolog systems can be one order of magnitude smaller at the cost of sacrificing ISO compatibility, performance, etc. Note that "performance" can be very misleading. Some Prolog programs may run particularly fast in some Prolog system and very badly in others.
- Keeping POWER relevant in the open source world
trealla
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Trealla Prolog binary releases (Linux, MacOS, Windows, WASM)
Update: we've got official releases now! https://github.com/trealla-prolog/trealla/releases
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PHP: Prolog Home Page
Hey, this is mine. Thanks for submitting it. I'll answer some questions.
> Why?
I ported Trealla Prolog to WASM (WASI) and I was looking for something useful to test it against. I found Spin, which can run WASM+CGI, and landed on this. Making this project exposed a number of bugs in my port that have now been fixed, so consumers of more useful projects[1][2] benefit as well. Also, PHP style templates are just fun! There's something valuable to just being able to shove a little bit of code inside some HTML and get it up on the internet.
I started my webdev journey with PHP many many years ago, and it's nice to revisit it from a different perspective. I don't use the real (elephant) PHP anymore, but I've gained a newfound appreciation for how fun its quick & dirty development style is.
I hope this project can serve as an example of how to use Prolog for fun things. It does showcase some of the cooler dynamic aspects of the language, and the PHP parsing code is like 10 lines of DCG.
> Is it a joke?
Yes and no. The name is certainly a joke. I was pondering what 'Prolog on Rails' might be and thought calling it PHP would be funny. This led to the PHP-style templates which were quick to implement and pretty powerful. Despite the humorous presentation, it does actually work.
> Can you use Prolog for web services?
Yes! For example, SWI has a mature HTTP package: https://www.swi-prolog.org/pldoc/doc_for?object=section(%27p.... It's used to power SWISH, an online Prolog code sharing thing: https://swish.swi-prolog.org/
> Next steps?
I would like to support persistence somehow. I think it'd be really cool if you could use Prolog's dynamic database[3] as a persistent store. Spin has components for Postgres and Redis so it shouldn't be too hard to implement, but I lose the WASI compatibility if I do that... which means I can't use the binary from WAPM, etc.
I would also like to experiment with running Trealla on Cloudflare Workers. I have another project, worker-prolog[4], which uses Tau Prolog (a Prolog written in Javascript) on Workers.
On a somewhat related note, I've also been playing around with Cosmopolitan libc[5]. I got Trealla to compile to an APE executable but there's some issues with the embedded Prolog libraries getting garbled, so I need to improve my GDB skills and figure out what's going on there.
Finally, I'd like to say thanks to Andrew Davison (@infradig on GitHub), the author of Trealla Prolog, for letting me add WASM support to his project and helping me with lots of things. For example, PHP led to Andrew implementing improvements for using DCGs to parse Prolog terms, which is now super fast[6]!
[1]: https://github.com/guregu/trealla-js
[2]: https://github.com/trealla-prolog/go
[3]: https://www.swi-prolog.org/pldoc/man?predicate=assertz/1
[4]: https://github.com/guregu/worker-prolog
[5]: https://justine.lol/cosmopolitan/
[6]: https://github.com/trealla-prolog/trealla/issues/53
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Lunatic: Erlang-Inspired Runtime for WebAssembly
Are you aware trealla can already target WASI as a target? (Just fyi in case you weren't)
https://github.com/trealla-prolog/trealla#webassembly-wasi
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Trealla – A compact, efficient Prolog interpreter written in plain-old C
Seems they just recreated the git repo to clear out ~1gb of history. https://github.com/trealla-prolog/trealla/issues/1
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Small Prologs engine for app
There is currently no API to query results, so I would be interested in what you are doing. Contact me on github.com/infradig/trealla if you'd prefer.
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N-Prolog version 1.8
u/mtriska inadvertently reminded me - I forgot to mention that Trealla Prolog is a small, (soon-to-be) ISO-compliant Prolog interpreter written in C. As such, it should compile to WASM.
- Trealla – compact, efficient Prolog interpreter written in plain-old C
What are some alternatives?
prolog - The only reasonable scripting engine for Go.
pyswip - PySwip is a Python - SWI-Prolog bridge enabling to query SWI-Prolog in your Python programs. It features an (incomplete) SWI-Prolog foreign language interface, a utility class that makes it easy querying with Prolog and also a Pythonic interface.
Prolog-to-List-Prolog - Converts Prolog algorithms to List Prolog algorithms
php - Prolog Home Page
trealla-js - Trealla Prolog for the web
packages-http - The SWI-Prolog HTTP server and client libraries
go - Trealla Prolog embedded in Go using WASM
librealsense - Intel® RealSense™ SDK
submillisecond - A lunatic web framework