Wind4 · October 8, 2014 07:16 · Oct 8, 2014
diff --git a/Math.uuid.js b/Math.uuid.js
@@ -0,0 +1,92 @@
+/*!
+Math.uuid.js (v1.4)
+http://www.broofa.com
+mailto:[email protected]
+
+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);
+    });
+  };
+})();