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+/*
+Copyright (c) 2006, Yahoo! Inc. All rights reserved.
+Code licensed under the BSD License:
+http://developer.yahoo.net/yui/license.txt
+version: 0.12.2
+*/
+/**
+ * The YAHOO object is the single global object used by YUI Library. It
+ * contains utility function for setting up namespaces, inheritance, and
+ * logging. YAHOO.util, YAHOO.widget, and YAHOO.example are namespaces
+ * created automatically for and used by the library.
+ * @module yahoo
+ * @title YAHOO Global
+ */
+
+if (typeof YAHOO == "undefined") {
+ /**
+ * The YAHOO global namespace object
+ * @class YAHOO
+ * @static
+ */
+ var YAHOO = {};
+}
+
+/**
+ * Returns the namespace specified and creates it if it doesn't exist
+ * <pre>
+ * YAHOO.namespace("property.package");
+ * YAHOO.namespace("YAHOO.property.package");
+ * </pre>
+ * Either of the above would create YAHOO.property, then
+ * YAHOO.property.package
+ *
+ * Be careful when naming packages. Reserved words may work in some browsers
+ * and not others. For instance, the following will fail in Safari:
+ * <pre>
+ * YAHOO.namespace("really.long.nested.namespace");
+ * </pre>
+ * This fails because "long" is a future reserved word in ECMAScript
+ *
+ * @method namespace
+ * @static
+ * @param {String*} arguments 1-n namespaces to create
+ * @return {Object} A reference to the last namespace object created
+ */
+YAHOO.namespace = function() {
+ var a=arguments, o=null, i, j, d;
+ for (i=0; i<a.length; ++i) {
+ d=a[i].split(".");
+ o=YAHOO;
+
+ // YAHOO is implied, so it is ignored if it is included
+ for (j=(d[0] == "YAHOO") ? 1 : 0; j<d.length; ++j) {
+ o[d[j]]=o[d[j]] || {};
+ o=o[d[j]];
+ }
+ }
+
+ return o;
+};
+
+/**
+ * Uses YAHOO.widget.Logger to output a log message, if the widget is available.
+ *
+ * @method log
+ * @static
+ * @param {String} msg The message to log.
+ * @param {String} cat The log category for the message. Default
+ * categories are "info", "warn", "error", time".
+ * Custom categories can be used as well. (opt)
+ * @param {String} src The source of the the message (opt)
+ * @return {Boolean} True if the log operation was successful.
+ */
+YAHOO.log = function(msg, cat, src) {
+ var l=YAHOO.widget.Logger;
+ if(l && l.log) {
+ return l.log(msg, cat, src);
+ } else {
+ return false;
+ }
+};
+
+/**
+ * Utility to set up the prototype, constructor and superclass properties to
+ * support an inheritance strategy that can chain constructors and methods.
+ *
+ * @method extend
+ * @static
+ * @param {Function} subc the object to modify
+ * @param {Function} superc the object to inherit
+ * @param {Object} overrides additional properties/methods to add to the
+ * subclass prototype. These will override the
+ * matching items obtained from the superclass
+ * if present.
+ */
+YAHOO.extend = function(subc, superc, overrides) {
+ var F = function() {};
+ F.prototype=superc.prototype;
+ subc.prototype=new F();
+ subc.prototype.constructor=subc;
+ subc.superclass=superc.prototype;
+ if (superc.prototype.constructor == Object.prototype.constructor) {
+ superc.prototype.constructor=superc;
+ }
+
+ if (overrides) {
+ for (var i in overrides) {
+ subc.prototype[i]=overrides[i];
+ }
+ }
+};
+
+/**
+ * Applies all prototype properties in the supplier to the receiver if the
+ * receiver does not have these properties yet. Optionally, one or more
+ * methods/properties can be specified (as additional parameters). This
+ * option will overwrite the property if receiver has it already.
+ *
+ * @method augment
+ * @static
+ * @param {Function} r the object to receive the augmentation
+ * @param {Function} s the object that supplies the properties to augment
+ * @param {String*} arguments zero or more properties methods to augment the
+ * receiver with. If none specified, everything
+ * in the supplier will be used unless it would
+ * overwrite an existing property in the receiver
+ */
+YAHOO.augment = function(r, s) {
+ var rp=r.prototype, sp=s.prototype, a=arguments, i, p;
+ if (a[2]) {
+ for (i=2; i<a.length; ++i) {
+ rp[a[i]] = sp[a[i]];
+ }
+ } else {
+ for (p in sp) {
+ if (!rp[p]) {
+ rp[p] = sp[p];
+ }
+ }
+ }
+};
+
+YAHOO.namespace("util", "widget", "example");