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A node.js interface to the SWI-Prolog library. A fork ofnode-prolog-swi.

For now, this addon supports the creation of rules and facts 'on the fly' and querying.

The SWI-Prolog library requires theSWI_HOME_DIR environment variable to be set (Seehttp://www.swi-prolog.org/FAQ/FindResources.html). Thus an example call could be:

SWI_HOME_DIR=/usr/lib/swi-prolog node tests/a.js

MissingSWI_HOME_DIR will result in

[FATAL ERROR:    Could not find system resources]

Now builds with node-gyp (Thanks to Johny Jose):

$ node-gyp configure$ SWI_HOME_DIR=/usr/lib/swi-prolog node-gyp build

After building, try running:

$ SWI_HOME_DIR=/usr/lib/swi-prolog NODE_PATH=build/Release node tests/a.js

If you like it, use and/or fork it. Corrections and improvements are welcome.

Initialization

var swipl = require('swipl');swipl.initialise();

Create module

var m = swipl.module("mymod");

Facts and rules (shortcut form.call_predicate("assert", [ term ]))

m.assert("likes(romeo, julia).");{}

Querying - Single solution

m.call_predicate("likes", ["romeo", "X"]);{ X: 'julia' }

Querying - Query

m.assert("likes(john, julia).");{}var q = m.open_query("likes", ["X", "julia"]);undefinedq.next_solution();{ X: 'romeo' }q.next_solution();{ X: 'john' }q.next_solution();falseq.close();true

Cleanup

swipl.cleanup();

Licensed under LGPL a copy is available onthe LICENSE.txt file.