--- /dev/null
+/* A few useful utility functions. */
+
+var internetExplorer = document.selection && window.ActiveXObject && /MSIE/.test(navigator.userAgent);
+var webkit = /AppleWebKit/.test(navigator.userAgent);
+var safari = /Apple Computers, Inc/.test(navigator.vendor);
+
+// Capture a method on an object.
+function method(obj, name) {
+ return function() {obj[name].apply(obj, arguments);};
+}
+
+// The value used to signal the end of a sequence in iterators.
+var StopIteration = {toString: function() {return "StopIteration"}};
+
+// Apply a function to each element in a sequence.
+function forEach(iter, f) {
+ if (iter.next) {
+ try {while (true) f(iter.next());}
+ catch (e) {if (e != StopIteration) throw e;}
+ }
+ else {
+ for (var i = 0; i < iter.length; i++)
+ f(iter[i]);
+ }
+}
+
+// Map a function over a sequence, producing an array of results.
+function map(iter, f) {
+ var accum = [];
+ forEach(iter, function(val) {accum.push(f(val));});
+ return accum;
+}
+
+// Create a predicate function that tests a string againsts a given
+// regular expression. No longer used but might be used by 3rd party
+// parsers.
+function matcher(regexp){
+ return function(value){return regexp.test(value);};
+}
+
+// Test whether a DOM node has a certain CSS class. Much faster than
+// the MochiKit equivalent, for some reason.
+function hasClass(element, className){
+ var classes = element.className;
+ return classes && new RegExp("(^| )" + className + "($| )").test(classes);
+}
+
+// Insert a DOM node after another node.
+function insertAfter(newNode, oldNode) {
+ var parent = oldNode.parentNode;
+ parent.insertBefore(newNode, oldNode.nextSibling);
+ return newNode;
+}
+
+function removeElement(node) {
+ if (node.parentNode)
+ node.parentNode.removeChild(node);
+}
+
+function clearElement(node) {
+ while (node.firstChild)
+ node.removeChild(node.firstChild);
+}
+
+// Check whether a node is contained in another one.
+function isAncestor(node, child) {
+ while (child = child.parentNode) {
+ if (node == child)
+ return true;
+ }
+ return false;
+}
+
+// The non-breaking space character.
+var nbsp = "\u00a0";
+var matching = {"{": "}", "[": "]", "(": ")",
+ "}": "{", "]": "[", ")": "("};
+
+// Standardize a few unportable event properties.
+function normalizeEvent(event) {
+ if (!event.stopPropagation) {
+ event.stopPropagation = function() {this.cancelBubble = true;};
+ event.preventDefault = function() {this.returnValue = false;};
+ }
+ if (!event.stop) {
+ event.stop = function() {
+ this.stopPropagation();
+ this.preventDefault();
+ };
+ }
+
+ if (event.type == "keypress") {
+ event.code = (event.charCode == null) ? event.keyCode : event.charCode;
+ event.character = String.fromCharCode(event.code);
+ }
+ return event;
+}
+
+// Portably register event handlers.
+function addEventHandler(node, type, handler, removeFunc) {
+ function wrapHandler(event) {
+ handler(normalizeEvent(event || window.event));
+ }
+ if (typeof node.addEventListener == "function") {
+ node.addEventListener(type, wrapHandler, false);
+ if (removeFunc) return function() {node.removeEventListener(type, wrapHandler, false);};
+ }
+ else {
+ node.attachEvent("on" + type, wrapHandler);
+ if (removeFunc) return function() {node.detachEvent("on" + type, wrapHandler);};
+ }
+}
+
+function nodeText(node) {
+ return node.textContent || node.innerText || node.nodeValue || "";
+}
+
+function nodeTop(node) {
+ var top = 0;
+ while (node.offsetParent) {
+ top += node.offsetTop;
+ node = node.offsetParent;
+ }
+ return top;
+}