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+/**
+ * Copyright 2009 Google Inc.
+ *
+ * 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.
+ */
+
+
+function isNodeText(node) {
+ return (node.nodeType == 3);
+}
+
+function object(o) {
+ var f = function() {};
+ f.prototype = o;
+ return new f();
+}
+
+function extend(obj, props) {
+ for(var p in props) {
+ obj[p] = props[p];
+ }
+ return obj;
+}
+
+function forEach(array, func) {
+ for(var i=0;i<array.length;i++) {
+ var result = func(array[i], i);
+ if (result) break;
+ }
+}
+
+function map(array, func) {
+ var result = [];
+ // must remain compatible with "arguments" pseudo-array
+ for(var i=0;i<array.length;i++) {
+ if (func) result.push(func(array[i], i));
+ else result.push(array[i]);
+ }
+ return result;
+}
+
+function filter(array, func) {
+ var result = [];
+ // must remain compatible with "arguments" pseudo-array
+ for(var i=0;i<array.length;i++) {
+ if (func(array[i], i)) result.push(array[i]);
+ }
+ return result;
+}
+
+function isArray(testObject) {
+ return testObject && typeof testObject === 'object' &&
+ !(testObject.propertyIsEnumerable('length')) &&
+ typeof testObject.length === 'number';
+}
+
+// Figure out what browser is being used (stolen from jquery 1.2.1)
+var userAgent = navigator.userAgent.toLowerCase();
+var browser = {
+ version: (userAgent.match(/.+(?:rv|it|ra|ie)[\/: ]([\d.]+)/) || [])[1],
+ safari: /webkit/.test(userAgent),
+ opera: /opera/.test(userAgent),
+ msie: /msie/.test(userAgent) && !/opera/.test(userAgent),
+ mozilla: /mozilla/.test(userAgent) && !/(compatible|webkit)/.test(userAgent),
+ windows: /windows/.test(userAgent) // dgreensp
+};
+
+function getAssoc(obj, name) {
+ return obj["_magicdom_"+name];
+}
+
+function setAssoc(obj, name, value) {
+ // note that in IE designMode, properties of a node can get
+ // copied to new nodes that are spawned during editing; also,
+ // properties representable in HTML text can survive copy-and-paste
+ obj["_magicdom_"+name] = value;
+}
+
+// "func" is a function over 0..(numItems-1) that is monotonically
+// "increasing" with index (false, then true). Finds the boundary
+// between false and true, a number between 0 and numItems inclusive.
+function binarySearch(numItems, func) {
+ if (numItems < 1) return 0;
+ if (func(0)) return 0;
+ if (! func(numItems-1)) return numItems;
+ var low = 0; // func(low) is always false
+ var high = numItems-1; // func(high) is always true
+ while ((high - low) > 1) {
+ var x = Math.floor((low+high)/2); // x != low, x != high
+ if (func(x)) high = x;
+ else low = x;
+ }
+ return high;
+}
+
+function binarySearchInfinite(expectedLength, func) {
+ var i = 0;
+ while (!func(i)) i += expectedLength;
+ return binarySearch(i, func);
+}
+
+function htmlPrettyEscape(str) {
+ return str.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
+ .replace(/\r?\n/g, '\\n');
+}