kloudglue-alasql/dist/alasql-prolog.js

Versatile SQL database for browser or node. Handles relational data and nested JSON (noSQL). Export to and import from Excel, localStorage or IndexedDB

// Prolog plugin

var yy = alasql.yy;

yy.Term = function (params) { return yy.extend(this, params); }
yy.Term.prototype.toString = function() {
	var s = this.termid;
	if(this.args && this.args.length > 0) {
		s += '('+this.args.map(function(arg){
			return arg.toString();
		})+')';
	}
	return s;
};

yy.AddRule = function (params) { return yy.extend(this, params); }
yy.AddRule.prototype.toString = function() {
	var s = '';
	if(this.left) s += this.left.toString();
	s += ':-';
	s += this.right.map(function(r){return r.toString()}).join(',');
	return s;
};

yy.AddRule.prototype.execute = function (databaseid, params, cb) {
//	var self = this;
//	console.log(this.expr.toJS());
//	var fn = new Function('params, alasql','return '+this.expr.toJS());
//	var res = fn(params, alasql);
	var res = 1;
	var objects = alasql.databases[databaseid].objects;
	var rule = {};
	if(!this.left) {
		this.right.forEach(function(term){
			rule.$class = term.termid;
		});
	}
	if(cb) res = cb(res);
	return res;
};