function fusker(uri) {
	// split up the uri into ranges and constants
	this.ranges = uri.match(/\[\d+-\d+\]/g);
	this.constants = uri.split(/\[\d+-\d+\]/g);

	// if there were no range matches, make this an empty
	// array to avoid problems
	if (!this.ranges) {
		this.ranges = new Array();
	}

	// make the ranges suitable for use
	for (var i = 0; i < this.ranges.length; i++) {
		// split this range
		var split = this.ranges[i].match(/\d+/g);
		
		// turn the original into an object
		this.ranges[i] = { start: parseInt(split[0],10),  end: parseInt(split[1],10), width: split[0].length };
		
		// make sure the range is sane; if start < end, swap them
		// i may change this in the future to allow reverse iteration
		if (this.ranges[i].start > this.ranges[i].end) {
			var tmp = this.ranges[i].start;
			this.ranges[i].start = this.ranges[i].end;
			this.ranges[i].end = tmp;
		}
	}
}

fusker.prototype.limit = function() {
	// the limit will be at least 1
	var limit = 1;

	// multiply by the size of each range
	for (var i = 0; i < this.ranges.length; i++) {
		limit *= this.ranges[i].end - this.ranges[i].start + 1;
	}

	// return the number of possible values
	return limit;
}

fusker.prototype.getURI = function(pos) {
	var i = this.constants.length - 1
	var out = new String();
	while (i >= 0) {
		out = this.constants[i] + out;
		
		i--;
		
		if (this.ranges[i] != undefined) {
			z = (this.ranges[i].start + pos % (this.ranges[i].end - this.ranges[i].start + 1));
			
			var append = z.toString();
			while (append.length < this.ranges[i].width) {
				append = '0' + append;
			}
			
			out = append + out;
			pos -= pos % (this.ranges[i].end - this.ranges[i].start + 1);
			pos /= (this.ranges[i].end - this.ranges[i].start + 1);	
		}
	}
	
	return out;
}