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/* A few useful utility functions. */
// 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.
function hasClass(element, className) {
var classes = element.className;
return classes && new RegExp("(^| )" + className + "($| )").test(classes);
}
function removeClass(element, className) {
element.className = element.className.replace(new RegExp(" " + className + "\\b", "g"), "");
return element;
}
// 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;
}
function isBR(node) {
var nn = node.nodeName;
return nn == "BR" || nn == "br";
}
function isSpan(node) {
var nn = node.nodeName;
return nn == "SPAN" || nn == "span";
}