/*!
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Math.uuid.js (v1.4)
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http://www.broofa.com
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mailto:robert@broofa.com
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Copyright (c) 2010 Robert Kieffer
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Dual licensed under the MIT and GPL licenses.
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*/
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/*
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* Generate a random uuid.
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*
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* USAGE: Math.uuid(length, radix)
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* length - the desired number of characters
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* radix - the number of allowable values for each character.
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*
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* EXAMPLES:
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* // No arguments - returns RFC4122, version 4 ID
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* >>> Math.uuid()
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* "92329D39-6F5C-4520-ABFC-AAB64544E172"
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*
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* // One argument - returns ID of the specified length
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* >>> Math.uuid(15) // 15 character ID (default base=62)
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* "VcydxgltxrVZSTV"
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*
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* // Two arguments - returns ID of the specified length, and radix. (Radix must be <= 62)
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* >>> Math.uuid(8, 2) // 8 character ID (base=2)
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* "01001010"
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* >>> Math.uuid(8, 10) // 8 character ID (base=10)
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* "47473046"
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* >>> Math.uuid(8, 16) // 8 character ID (base=16)
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* "098F4D35"
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*/
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(function() {
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// Private array of chars to use
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var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split('');
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Math.uuid = function (len, radix) {
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var chars = CHARS, uuid = [], i;
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radix = radix || chars.length;
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if (len) {
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// Compact form
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for (i = 0; i < len; i++) uuid[i] = chars[0 | Math.random()*radix];
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} else {
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// rfc4122, version 4 form
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var r;
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// rfc4122 requires these characters
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uuid[8] = uuid[13] = uuid[18] = uuid[23] = '-';
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uuid[14] = '4';
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// Fill in random data. At i==19 set the high bits of clock sequence as
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// per rfc4122, sec. 4.1.5
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for (i = 0; i < 36; i++) {
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if (!uuid[i]) {
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r = 0 | Math.random()*16;
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uuid[i] = chars[(i == 19) ? (r & 0x3) | 0x8 : r];
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}
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}
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}
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return uuid.join('');
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};
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})();
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