I currently have the need to execute prolog code in an application I am making. I am aware that Apple probably never would allow something like this in the App Store, but that is not the intention either. This is more a private project that will never reach the App Store.
Purpose
In this case prolog is used to describe an object (like for example a telephone) and its properties. The object will be drawn with OpenGL using coordinates specified in the prolog script. The reason for using prolog is that I need the ability to query the program about some of the features this object has, and prolog eases this a lot. Bottom line: I “need” to query a prolog script from my app.
Possible solutions
- Embed an already existing implementation written in C. I am unsure if this will even work.
- Execute the prolog code on another machine and use the network to query prolog.
- It seems that it is possible to run some sort Ruby VM inside the app (shinycocos uses this as far as I understand), could this be used to run one of the Ruby Prolog implementations?
- Find some alternative to Prolog. This needs to give me some of the same possibilities I get with prolog.
Sadly, google gives me close to no results at all, so I have a feeling that I might be quite alone on this project. If anyone have any experience or clue at all, I would be very thankful.
Half a year later, I would just like to provide some insight on this. I ended up writing a server with an interface to prolog in Java, accepting prolog calls through TCP. It works almost exactly like the live prolog interpreter SWI-prolog (among others) provides, and mostly works quite well. However, it is far from an optimal solution, as you can’t call functions from inside prolog. You lose the possibility of having two-way communication.
If I were to start all over again, I would certainly have tried harder to compile one of the pure C implementations for iOS. I gave it a quick go, but my lack of experience stopped me from even removing all of the errors I got. Judging by the fact that you cannot have prolog running as a background process on a unmodified version of iOS as well, some major rewriting would have to be done. Because of this, one might just have to write a new implementation (perhaps inspired by some of the more lightweight ones out there) from scratch to get the perfect solution.