uuid.js

/*!
Math.uuid.js (v1.4)

http://www.broofa.com

mailto:robert@broofa.com

Copyright (c) 2010 Robert Kieffer
Dual licensed under the MIT and GPL licenses.
*/

/*
 * Generate a random uuid.
 *
 * USAGE: Math.uuid(length, radix)
 *   length - the desired number of characters
 *   radix  - the number of allowable values for each character.
 *
 * EXAMPLES:
 *   // No arguments  - returns RFC4122, version 4 ID
 *   >>> Math.uuid()
 *   "92329D39-6F5C-4520-ABFC-AAB64544E172"
 *
 *   // One argument - returns ID of the specified length
 *   >>> Math.uuid(15)     // 15 character ID (default base=62)
 *   "VcydxgltxrVZSTV"
 *
 *   // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62)
 *   >>> Math.uuid(8, 2)  // 8 character ID (base=2)
 *   "01001010"
 *   >>> Math.uuid(8, 10) // 8 character ID (base=10)
 *   "47473046"
 *   >>> Math.uuid(8, 16) // 8 character ID (base=16)
 *   "098F4D35"
 */

var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');

exports.uuid = function (len, radix) {
	var chars = CHARS, uuid = [], i;
	radix = radix || chars.length;

	if (len) {
	  // Compact form
	  for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];
	} else {
	  // rfc4122, version 4 form
	  var r;

	  // rfc4122 requires these characters
	  uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
	  uuid[14] = '4';

	  // Fill in random data.  At i==19 set the high bits of clock sequence as
	  // per rfc4122, sec. 4.1.5
	  for (i = 0; i < 36; i++) {
		if (!uuid[i]) {
		  r = 0 | Math.random()*16;
		  uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
		}
	  }
}

return uuid.join('');
};

// A more performant, but slightly bulkier, RFC4122v4 solution.  We boost performance
// by minimizing calls to random()
exports.uuidFast = function() {
	var chars = CHARS, uuid = new Array(36), rnd=0, r;
	for (var i = 0; i < 36; i++) {
	  if (i==8 || i==13 ||  i==18 || i==23) {
		uuid[i] = '-';
	  } else if (i==14) {
		uuid[i] = '4';
	  } else {
		if (rnd <= 0x02) rnd = 0x2000000 + (Math.random()*0x1000000)|0;
		r = rnd & 0xf;
		rnd = rnd >> 4;
		uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
	  }
	}
return uuid.join('');
};

// A more compact, but less performant, RFC4122v4 solution:
exports.uuidCompact = function() {
	return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
	  var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
	  return v.toString(16);
	});
};