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