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I have a large Ruby application that is just crying out for the addition of an inference engine; I don't need a lot of functionality, am not afraid of integrating C libraries, and am coming up empty in my Googling.

There seem to be plenty of rules engines in Python and on the JVM; while I'd prefer to be using Python, I'm not rewriting the whole damned application just to add an inference engine, so I'd really like to see if such a thing exists.

Anyone have any ideas?

James Felix Black
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  • I don't have the heart to close this, even though it's off-topic according to present rules. This is why I can't be a mod :) – Wayne Conrad Jun 15 '15 at 15:30

2 Answers2

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Here are some pointers I found while Googling. I've added the last activity after specific gems to give an indication if they are still being maintained, and sorted by that date.

Plenty of options, maybe there is something to your liking here?

Community
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rdvdijk
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    I believe treetop is not an inference engine but a parser generator, I would not expect it to be apt for the OP's problem. – riffraff Oct 01 '11 at 11:34
  • True, thanks. I had listed it because it was the accepted the answer to the question I've linked as the first in the list. I'll correct my answer. – rdvdijk Oct 01 '11 at 12:29
  • Thanks, my googling is clearly sub-par. I'll check these out. – James Felix Black Oct 01 '11 at 14:42
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Adding a new answer to an old question:

The wongi-engine is currently the best (only?) choice for a Ruby rules engine. It's based on the Rete algorithm and has some following on github.

All the options given by rdvdijk above are either no longer maintained, or completely dead and gone.

Alternatively, over on Ruby Quiz there is an awesomely lightweight inference engine written entirely in Ruby using a directed graph.

djoll
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