Generates ISBN registrant tables given XML Range Message (from http://www.isbn-international.org/page/ranges) loaded in the browser

ISBNTableGenerator.js

/*
	***** BEGIN LICENSE BLOCK *****
	Generates ISBN registrant tables given XML Range Message
	(from http://www.isbn-international.org/page/ranges) loaded in the browser
	
	Copyright © 2013 Aurimas Vinckevicius (aurimas.dev~at~gmail.com)
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as
	published by the Free Software Foundation, either version 3 of the
	License, or (at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
	
	***** END LICENSE BLOCK *****
*/

var prefVarName = 'prefs';
var prefs = {};
var same = {};
var groups = document.getElementsByTagName('Group');
for(var i=0, n=groups.length; i<n; i++) {
	var prefix = groups[i].getElementsByTagName('Prefix')[0].textContent.split('-');
	var uccPrefix = prefix[0];
	prefix = prefix[1];
	
	var ranges = [];
	var rules = groups[i].getElementsByTagName('Rule');
	for(var j=0, m=rules.length; j<m; j++) {
			var range = rules[j].getElementsByTagName('Range')[0].textContent.split('-');
			var length = rules[j].getElementsByTagName('Length')[0].textContent * 1;
			ranges.push(range[0].substr(0,length));
			ranges.push(range[1].substr(0,length));
	}
	
	if(ranges.length) {
		ranges = ranges.sort(function(a, b) {
				if(a.length == b.length) return a==b?0:(a<b?-1:1);
				return a.length - b.length;
			});
		if(!same[ranges.join('.')]) {
			if(!prefs[uccPrefix]) prefs[uccPrefix] = {};
			prefs[uccPrefix][prefix] = ranges;
			same[ranges.join('.')] = [uccPrefix+"']['"+prefix];
		} else {
			same[ranges.join('.')].push(uccPrefix+"']['"+prefix);
		}
	}
}

var sameStr = '';
for(var i in same) {
	if(same[i].length == 1) continue;
	same[i].push(same[i].shift());
	sameStr += prefVarName + "['" + same[i].join("']=" + prefVarName + "['") + "']; ";
}

console.log("var " + prefVarName + "=" + JSON.stringify(prefs) + ";\n" + sameStr);