Origo OS

/*!

Math.uuid.js (v1.4)

http://www.broofa.com

mailto:robert@broofa.com

Copyright (c) 2009 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"

 */

Math.uuid = (function() {

    // Private array of chars to use

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

    return 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 compact, but less performant, RFC4122v4 compliant solution:

Math.uuid2 = 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);

    }).toUpperCase();

};