Add UUID generator.

core/utils.js

@@ -551,3 +551,25 @@ Blockly.tokenizeInterpolation = function(message) {
   }
   return tokens;
 };
+
+/**
+ * Legal characters for the unique ID.
+ * Should be all on a US keyboard.  No XML special characters or control codes.
+ * @private
+ */
+Blockly.CHARACTER_SOUP_ = '!#$%()*+,-./:;=?@[]^_`{|}~' +
+    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+
+/**
+ * Generate a unique ID.  This should be globally unique.
+ * 88 characters ^ 20 length ≈ 129 bits (one bit better than a UUID).
+ * @return {string}
+ */
+Blockly.genUid = function() {
+  var id = [];
+  for (var i = 0; i < 20; i++) {
+    id[i] = Blockly.CHARACTER_SOUP_.charAt(Math.random() *
+        Blockly.CHARACTER_SOUP_.length);
+  }
+  return id.join('');
+};

tests/jsunit/blockly_test.js

@@ -19,79 +19,10 @@
  */
 'use strict';
 
-function verify_DB_(msg, expected, db) {
-   var equal = (expected.length == db.length);
-   if (equal) {
-     for (var x = 0; x < expected.length; x++) {
-       if (expected[x] != db[x]) {
-         equal = false;
-         break;
-       }
-     }
-   }
-   if (equal) {
-     assertTrue(msg, true);
-   } else {
-     assertEquals(msg, expected, db);
-   }
-}
-
-function test_DB_addConnection() {
-  var db = new Blockly.ConnectionDB();
-  var o2 = {y_: 2, sourceBlock_: {}};
-  db.addConnection_(o2);
-  verify_DB_('Adding connection #2', [o2], db);
-
-  var o4 = {y_: 4, sourceBlock_: {}};
-  db.addConnection_(o4);
-  verify_DB_('Adding connection #4', [o2, o4], db);
-
-  var o1 = {y_: 1, sourceBlock_: {}};
-  db.addConnection_(o1);
-  verify_DB_('Adding connection #1', [o1, o2, o4], db);
-
-  var o3a = {y_: 3, sourceBlock_: {}};
-  db.addConnection_(o3a);
-  verify_DB_('Adding connection #3a', [o1, o2, o3a, o4], db);
-
-  var o3b = {y_: 3, sourceBlock_: {}};
-  db.addConnection_(o3b);
-  verify_DB_('Adding connection #3b', [o1, o2, o3b, o3a, o4], db);
-}
-
-function test_DB_removeConnection() {
-  var db = new Blockly.ConnectionDB();
-  var o1 = {y_: 1, sourceBlock_: {}};
-  var o2 = {y_: 2, sourceBlock_: {}};
-  var o3a = {y_: 3, sourceBlock_: {}};
-  var o3b = {y_: 3, sourceBlock_: {}};
-  var o3c = {y_: 3, sourceBlock_: {}};
-  var o4 = {y_: 4, sourceBlock_: {}};
-  db.addConnection_(o1);
-  db.addConnection_(o2);
-  db.addConnection_(o3c);
-  db.addConnection_(o3b);
-  db.addConnection_(o3a);
-  db.addConnection_(o4);
-  verify_DB_('Adding connections 1-4', [o1, o2, o3a, o3b, o3c, o4], db);
-
-  db.removeConnection_(o2);
-  verify_DB_('Removing connection #2', [o1, o3a, o3b, o3c, o4], db);
-
-  db.removeConnection_(o4);
-  verify_DB_('Removing connection #4', [o1, o3a, o3b, o3c], db);
-
-  db.removeConnection_(o1);
-  verify_DB_('Removing connection #1', [o3a, o3b, o3c], db);
-
-  db.removeConnection_(o3a);
-  verify_DB_('Removing connection #3a', [o3b, o3c], db);
-
-  db.removeConnection_(o3c);
-  verify_DB_('Removing connection #3c', [o3b], db);
-
-  db.removeConnection_(o3b);
-  verify_DB_('Removing connection #3b', [], db);
+function test_genUid() {
+  var a = Blockly.genUid();
+  var b = Blockly.genUid();
+  assertFalse('UUID different', a == b);
 }
 
 function test_addClass() {

tests/jsunit/connection_test.js

@@ -0,0 +1,95 @@
+/**
+ * @license
+ * Blockly Tests
+ *
+ * Copyright 2015 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+'use strict';
+
+function verify_DB_(msg, expected, db) {
+   var equal = (expected.length == db.length);
+   if (equal) {
+     for (var x = 0; x < expected.length; x++) {
+       if (expected[x] != db[x]) {
+         equal = false;
+         break;
+       }
+     }
+   }
+   if (equal) {
+     assertTrue(msg, true);
+   } else {
+     assertEquals(msg, expected, db);
+   }
+}
+
+function test_DB_addConnection() {
+  var db = new Blockly.ConnectionDB();
+  var o2 = {y_: 2, sourceBlock_: {}};
+  db.addConnection_(o2);
+  verify_DB_('Adding connection #2', [o2], db);
+
+  var o4 = {y_: 4, sourceBlock_: {}};
+  db.addConnection_(o4);
+  verify_DB_('Adding connection #4', [o2, o4], db);
+
+  var o1 = {y_: 1, sourceBlock_: {}};
+  db.addConnection_(o1);
+  verify_DB_('Adding connection #1', [o1, o2, o4], db);
+
+  var o3a = {y_: 3, sourceBlock_: {}};
+  db.addConnection_(o3a);
+  verify_DB_('Adding connection #3a', [o1, o2, o3a, o4], db);
+
+  var o3b = {y_: 3, sourceBlock_: {}};
+  db.addConnection_(o3b);
+  verify_DB_('Adding connection #3b', [o1, o2, o3b, o3a, o4], db);
+}
+
+function test_DB_removeConnection() {
+  var db = new Blockly.ConnectionDB();
+  var o1 = {y_: 1, sourceBlock_: {}};
+  var o2 = {y_: 2, sourceBlock_: {}};
+  var o3a = {y_: 3, sourceBlock_: {}};
+  var o3b = {y_: 3, sourceBlock_: {}};
+  var o3c = {y_: 3, sourceBlock_: {}};
+  var o4 = {y_: 4, sourceBlock_: {}};
+  db.addConnection_(o1);
+  db.addConnection_(o2);
+  db.addConnection_(o3c);
+  db.addConnection_(o3b);
+  db.addConnection_(o3a);
+  db.addConnection_(o4);
+  verify_DB_('Adding connections 1-4', [o1, o2, o3a, o3b, o3c, o4], db);
+
+  db.removeConnection_(o2);
+  verify_DB_('Removing connection #2', [o1, o3a, o3b, o3c, o4], db);
+
+  db.removeConnection_(o4);
+  verify_DB_('Removing connection #4', [o1, o3a, o3b, o3c], db);
+
+  db.removeConnection_(o1);
+  verify_DB_('Removing connection #1', [o3a, o3b, o3c], db);
+
+  db.removeConnection_(o3a);
+  verify_DB_('Removing connection #3a', [o3b, o3c], db);
+
+  db.removeConnection_(o3c);
+  verify_DB_('Removing connection #3c', [o3b], db);
+
+  db.removeConnection_(o3b);
+  verify_DB_('Removing connection #3b', [], db);
+}

tests/jsunit/index.html

@@ -8,6 +8,7 @@
   </head>
   <body>
     <script src="blockly_test.js"></script>
+    <script src="connection_test.js"></script>
     <script src="generator_test.js"></script>
     <script src="names_test.js"></script>
     <script src="workspace_test.js"></script>