| /*! |
| 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" |
| */ |
| (function() { |
| // Private array of chars to use |
| var CHARS = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.split(''); |
| |
| Math.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() |
| Math.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: |
| Math.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); |
| }); |
| }; |
| })(); |