comt: comparison src/cm/media/js/lib/yui/yui_3.0.0b1/build/attribute/attribute.js

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src/cm/media/js/lib/yui/yui_3.0.0b1/build/attribute/attribute.js

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+:40c8f766c9b8
+/*
+Copyright (c) 2009, Yahoo! Inc. All rights reserved.
+Code licensed under the BSD License:
+http://developer.yahoo.net/yui/license.txt
+version: 3.0.0b1
+build: 1163
+*/
+YUI.add('attribute', function(Y) {
+/**
+* The State class maintains state for a collection of named items, with
+* a varying number of properties defined.
+*
+* It avoids the need to create a separate class for the item, and separate instances
+* of these classes for each item, by storing the state in a 2 level hash table,
+* improving performance when the number of items is likely to be large.
+*
+* @constructor
+* @class State
+*/
+Y.State = function() {
+/**
+* Hash of attributes
+* @property data
+*/
+this.data = {};
+};
+Y.State.prototype = {
+/**
+* Adds a property to an item.
+*
+* @method add
+* @param name {String} The name of the item.
+* @param key {String} The name of the property.
+* @param val {Any} The value of the property.
+*/
+add : function(name, key, val) {
+var d = this.data;
+d[key] = d[key] || {};
+d[key][name] = val;
+},
+/**
+* Adds multiple properties to an item.
+*
+* @method addAll
+* @param name {String} The name of the item.
+* @param o {Object} A hash of property/value pairs.
+*/
+addAll: function(name, o) {
+var key;
+for (key in o) {
+if (o.hasOwnProperty(key)) {
+this.add(name, key, o[key]);
+}
+}
+},
+/**
+* Removes a property from an item.
+*
+* @method remove
+* @param name {String} The name of the item.
+* @param key {String} The property to remove.
+*/
+remove: function(name, key) {
+var d = this.data;
+if (d[key] && (name in d[key])) {
+delete d[key][name];
+}
+},
+/**
+* Removes multiple properties from an item, or remove the item completely.
+*
+* @method removeAll
+* @param name {String} The name of the item.
+* @param o {Object|Array} Collection of properties to delete. If not provided, the entire item is removed.
+*/
+removeAll: function(name, o) {
+var d = this.data;
+Y.each(o || d, function(v, k) {
+if(Y.Lang.isString(k)) {
+this.remove(name, k);
+} else {
+this.remove(name, v);
+}
+}, this);
+},
+/**
+* For a given item, returns the value of the property requested, or undefined if not found.
+*
+* @method get
+* @param name {String} The name of the item
+* @param key {String} Optional. The property value to retrieve.
+* @return {Any} The value of the supplied property.
+*/
+get: function(name, key) {
+var d = this.data;
+return (d[key] && name in d[key]) ?  d[key][name] : undefined;
+},
+/**
+* For the given item, returns a disposable object with all of the
+* item's property/value pairs.
+*
+* @method getAll
+* @param name {String} The name of the item
+* @return {Object} An object with property/value pairs for the item.
+*/
+getAll : function(name) {
+var d = this.data, o;
+Y.each(d, function(v, k) {
+if (name in d[k]) {
+o = o || {};
+o[k] = v[name];
+}
+}, this);
+return o;
+}
+};
+/**
+* The attribute module provides an augmentable Attribute implementation, which
+* adds configurable attributes and attribute change events to the class being
+* augmented. It also provides a State class, which is used internally by Attribute,
+* but can also be used independently to provide a name/property/value data structure to
+* store state.
+*
+* @module attribute
+*/
+var O = Y.Object,
+EventTarget = Y.EventTarget,
+DOT = ".",
+CHANGE = "Change",
+// Externally configurable props
+GETTER = "getter",
+SETTER = "setter",
+READ_ONLY = "readOnly",
+WRITE_ONCE = "writeOnce",
+VALIDATOR = "validator",
+VALUE = "value",
+VALUE_FN = "valueFn",
+BROADCAST = "broadcast",
+LAZY_ADD = "lazyAdd",
+// Used for internal state management
+ADDED = "added",
+INITIALIZING = "initializing",
+INIT_VALUE = "initValue",
+PUBLISHED = "published",
+DEF_VALUE = "defaultValue",
+LAZY = "lazy",
+IS_LAZY_ADD = "isLazyAdd",
+INVALID_VALUE,
+MODIFIABLE = {};
+// Properties which can be changed after the attribute has been added.
+MODIFIABLE[READ_ONLY] = 1;
+MODIFIABLE[WRITE_ONCE] = 1;
+MODIFIABLE[GETTER] = 1;
+MODIFIABLE[BROADCAST] = 1;
+/**
+* <p>
+* Attribute provides configurable attribute support along with attribute change events. It is designed to be
+* augmented onto a host class, and provides the host with the ability to configure attributes to store and retrieve state,
+* along with attribute change events.
+* </p>
+* <p>For example, attributes added to the host can be configured:</p>
+* <ul>
+*     <li>As read only.</li>
+*     <li>As write once.</li>
+*     <li>With a setter function, which can be used to manipulate
+*     values passed to Attribute's <a href="#method_set">set</a> method, before they are stored.</li>
+*     <li>With a getter function, which can be used to manipulate stored values,
+*     before they are returned by Attribute's <a href="#method_get">get</a> method.</li>
+*     <li>With a validator function, to validate values before they are stored.</li>
+* </ul>
+*
+* <p>See the <a href="#method_addAttr">addAttr</a> method, for the complete set of configuration
+* options available for attributes</p>.
+*
+* <p><strong>NOTE:</strong> Most implementations will be better off extending the <a href="Base.html">Base</a> class,
+* instead of augmenting Attribute directly. Base augments Attribute and will handle the initial configuration
+* of attributes for derived classes, accounting for values passed into the constructor.</p>
+*
+* @class Attribute
+* @uses EventTarget
+*/
+function Attribute() {
+// Perf tweak - avoid creating event literals if not required.
+this._ATTR_E_FACADE = {};
+EventTarget.call(this, {emitFacade:true});
+this._conf = new Y.State();
+}
+/**
+* <p>The value to return from an attribute setter in order to prevent the set from going through.</p>
+*
+* <p>You can return this value from your setter if you wish to combine validator and setter
+* functionality into a single setter function, which either returns the massaged value to be stored or
+* Attribute.INVALID_VALUE to prevent invalid values from being stored.</p>
+*
+* @property Attribute.INVALID_VALUE
+* @type Object
+* @static
+* @final
+*/
+Attribute.INVALID_VALUE = {};
+INVALID_VALUE = Attribute.INVALID_VALUE;
+/**
+* The list of properties which can be configured for
+* each attribute (e.g. setter, getter, writeOnce etc.).
+*
+* This property is used internally as a whitelist for faster
+* Y.mix operations.
+*
+* @property Attribute._ATTR_CFG
+* @type Array
+* @static
+* @protected
+*/
+Attribute._ATTR_CFG = [SETTER, GETTER, VALIDATOR, VALUE, VALUE_FN, WRITE_ONCE, READ_ONLY, LAZY_ADD, BROADCAST];
+Attribute.prototype = {
+/**
+* <p>
+* Adds an attribute with the provided configuration to the host object.
+* </p>
+* <p>
+* The config argument object supports the following properties:
+* </p>
+*
+* <dl>
+*    <dt>value &#60;Any&#62;</dt>
+*    <dd>The initial value to set on the attribute</dd>
+*
+*    <dt>valueFn &#60;Function&#62;</dt>
+*    <dd>A function, which will return the initial value to set on the attribute. This is useful
+*    for cases where the attribute configuration is defined statically, but needs to
+*    reference the host instance ("this") to obtain an initial value.
+*    If defined, this precedence over the value property.</dd>
+*
+*    <dt>readOnly &#60;boolean&#62;</dt>
+*    <dd>Whether or not the attribute is read only. Attributes having readOnly set to true
+*        cannot be modified by invoking the set method.</dd>
+*
+*    <dt>writeOnce &#60;boolean&#62;</dt>
+*    <dd>Whether or not the attribute is "write once". Attributes having writeOnce set to true,
+*        can only have their values set once, be it through the default configuration,
+*        constructor configuration arguments, or by invoking set.</dd>
+*
+*    <dt>setter &#60;Function&#62;</dt>
+*    <dd>The setter function used to massage or normalize the value passed to the set method for the attribute.
+*    The value returned by the setter will be the final stored value. Returning
+*    <a href="#property_Attribute.INVALID_VALUE">Attribute.INVALID_VALUE</a>, from the setter will prevent
+*    the value from being stored.</dd>
+*
+*    <dt>getter &#60;Function&#62;</dt>
+*    <dd>The getter function used to massage or normalize the value returned by the get method for the attribute.
+*    The value returned by the getter function is the value which will be returned to the user when they
+*    invoke get.</dd>
+*
+*    <dt>validator &#60;Function&#62;</dt>
+*    <dd>The validator function invoked prior to setting the stored value. Returning
+*    false from the validator function will prevent the value from being stored.</dd>
+*
+*    <dt>broadcast &#60;int&#62;</dt>
+*    <dd>If and how attribute change events for this attribute should be broadcast. See CustomEvent's <a href="CustomEvent.html#property_broadcast">broadcast</a> property for
+*    valid values. By default attribute change events are not broadcast.</dd>
+*
+*    <dt>lazyAdd &#60;boolean&#62;</dt>
+*    <dd>Whether or not to delay initialization of the attribute until the first call to get/set it.
+*    This flag can be used to over-ride lazy initialization on a per attribute basis, when adding multiple attributes through
+*    the <a href="#method_addAttrs">addAttrs</a> method.</dd>
+*
+* </dl>
+*
+* <p>The setter, getter and validator are invoked with the value and name passed in as the first and second arguments, and with
+* the context ("this") set to the host object.</p>
+*
+* @method addAttr
+*
+* @param {String} name The name of the attribute.
+* @param {Object} config An object with attribute configuration property/value pairs, specifying the configuration for the attribute.
+*
+* <p>
+* <strong>NOTE:</strong> The configuration object is modified when adding an attribute, so if you need
+* to protect the original values, you will need to merge the object.
+* </p>
+*
+* @param {boolean} lazy (optional) Whether or not to add this attribute lazily (on the first call to get/set).
+*
+* @return {Object} A reference to the host object.
+*
+* @chainable
+*/
+addAttr: function(name, config, lazy) {
+var conf = this._conf;
+lazy = (LAZY_ADD in config) ? config[LAZY_ADD] : lazy;
+if (lazy && !this.attrAdded(name)) {
+conf.add(name, LAZY, config || {});
+conf.add(name, ADDED, true);
+} else {
+if (!this.attrAdded(name) || conf.get(name, IS_LAZY_ADD)) {
+config = config || {};
+var value, hasValue = (VALUE in config);
+if(hasValue) {
+// We'll go through set, don't want to set value in _conf directory
+value = config.value;
+delete config.value;
+}
+config.added = true;
+config.initializing = true;
+conf.addAll(name, config);
+if (hasValue) {
+// Go through set, so that raw values get normalized/validated
+this.set(name, value);
+}
+conf.remove(name, INITIALIZING);
+}
+}
+return this;
+},
+/**
+* Checks if the given attribute has been added to the host
+*
+* @method attrAdded
+* @param {String} name The name of the attribute to check.
+* @return {boolean} true if an attribute with the given name has been added, false if it hasn't. This method will return true for lazily added attributes.
+*/
+attrAdded: function(name) {
+return !!this._conf.get(name, ADDED);
+},
+/**
+* Updates the configuration of an attribute which has already been added.
+* <p>
+* The properties which can be modified through this interface are limited
+* to the following subset of attributes, which can be safely modified
+* after a value has already been set on the attribute: readOnly, writeOnce,
+* broadcast and getter.
+* </p>
+* @method modifyAttr
+* @param {String} name The name of the attribute whose configuration is to be updated.
+* @param {Object} config An object with configuration property/value pairs, specifying the configuration properties to modify.
+*/
+modifyAttr: function(name, config) {
+if (this.attrAdded(name)) {
+if (this._isLazyAttr(name)) {
+this._addLazyAttr(name);
+}
+var prop, conf = this._conf;
+for (prop in config) {
+if (MODIFIABLE[prop] && config.hasOwnProperty(prop)) {
+conf.add(name, prop, config[prop]);
+// If we reconfigured broadcast, need to republish
+if (prop === BROADCAST) {
+conf.remove(name, PUBLISHED);
+}
+}
+}
+}
+},
+/**
+* Removes an attribute from the host object
+*
+* @method removeAttr
+* @param {String} name The name of the attribute to be removed.
+*/
+removeAttr: function(name) {
+this._conf.removeAll(name);
+},
+/**
+* Returns the current value of the attribute. If the attribute
+* has been configured with a 'getter' function, this method will delegate
+* to the 'getter' to obtain the value of the attribute.
+*
+* @method get
+*
+* @param {String} name The name of the attribute. If the value of the attribute is an Object,
+* dot notation can be used to obtain the value of a property of the object (e.g. <code>get("x.y.z")</code>)
+*
+* @return {Any} The value of the attribute
+*/
+get : function(name) {
+var fullName = name,
+conf = this._conf,
+path,
+getter,
+val;
+if (name.indexOf(DOT) !== -1) {
+path = name.split(DOT);
+name = path.shift();
+}
+// On Demand - Should be rare - handles out of order valueFn references
+if (this._tCfgs && this._tCfgs[name]) {
+var cfg = {};
+cfg[name] = this._tCfgs[name];
+delete this._tCfgs[name];
+this._addAttrs(cfg, this._tVals);
+}
+// Lazy Init
+if (this._isLazyAttr(name)) {
+this._addLazyAttr(name);
+}
+val = conf.get(name, VALUE);
+getter = conf.get(name, GETTER);
+val = (getter) ? getter.call(this, val, fullName) : val;
+val = (path) ? O.getValue(val, path) : val;
+return val;
+},
+/**
+* Checks whether or not the attribute is one which has been
+* added lazily and still requires initialization.
+*
+* @method _isLazyAttr
+* @private
+* @param {String} name The name of the attribute
+* @return {boolean} true if it's a lazily added attribute, false otherwise.
+*/
+_isLazyAttr: function(name) {
+return this._conf.get(name, LAZY);
+},
+/**
+* Finishes initializing an attribute which has been lazily added.
+*
+* @method _addLazyAttr
+* @private
+* @param {Object} name The name of the attribute
+*/
+_addLazyAttr: function(name) {
+var conf = this._conf;
+var lazyCfg = conf.get(name, LAZY);
+conf.add(name, IS_LAZY_ADD, true);
+conf.remove(name, LAZY);
+this.addAttr(name, lazyCfg);
+},
+/**
+* Sets the value of an attribute.
+*
+* @method set
+* @chainable
+*
+* @param {String} name The name of the attribute. If the
+* current value of the attribute is an Object, dot notation can be used
+* to set the value of a property within the object (e.g. <code>set("x.y.z", 5)</code>).
+*
+* @param {Any} value The value to set the attribute to.
+*
+* @param {Object} opts (Optional) Optional event data to be mixed into
+* the event facade passed to subscribers of the attribute's change event. This
+* can be used as a flexible way to identify the source of a call to set, allowing
+* the developer to distinguish between set called internally by the host, vs.
+* set called externally by the application developer.
+*
+* @return {Object} A reference to the host object.
+*/
+set : function(name, val, opts) {
+return this._setAttr(name, val, opts);
+},
+/**
+* Resets the attribute (or all attributes) to its initial value, as long as
+* the attribute is not readOnly, or writeOnce.
+*
+* @method reset
+* @param {String} name Optional. The name of the attribute to reset.  If omitted, all attributes are reset.
+* @return {Object} A reference to the host object.
+* @chainable
+*/
+reset : function(name) {
+if (name) {
+if (this._isLazyAttr(name)) {
+this._addLazyAttr(name);
+}
+this.set(name, this._conf.get(name, INIT_VALUE));
+} else {
+var added = this._conf.data.added;
+Y.each(added, function(v, n) {
+this.reset(n);
+}, this);
+}
+return this;
+},
+/**
+* Allows setting of readOnly/writeOnce attributes. See <a href="#method_set">set</a> for argument details.
+*
+* @method _set
+* @protected
+* @chainable
+*
+* @param {String} name The name of the attribute.
+* @param {Any} val The value to set the attribute to.
+* @param {Object} opts (Optional) Optional event data to be mixed into
+* the event facade passed to subscribers of the attribute's change event.
+* @return {Object} A reference to the host object.
+*/
+_set : function(name, val, opts) {
+return this._setAttr(name, val, opts, true);
+},
+/**
+* Provides the common implementation for the public set and protected _set methods.
+*
+* See <a href="#method_set">set</a> for argument details.
+*
+* @method _setAttr
+* @protected
+* @chainable
+*
+* @param {String} name The name of the attribute.
+* @param {Any} value The value to set the attribute to.
+* @param {Object} opts (Optional) Optional event data to be mixed into
+* the event facade passed to subscribers of the attribute's change event.
+* @param {boolean} force If true, allows the caller to set values for
+* readOnly or writeOnce attributes which have already been set.
+*
+* @return {Object} A reference to the host object.
+*/
+_setAttr : function(name, val, opts, force) {
+var allowSet = true,
+conf = this._conf,
+data = conf.data,
+initialSet,
+strPath,
+path,
+currVal;
+if (name.indexOf(DOT) !== -1) {
+strPath = name;
+path = name.split(DOT);
+name = path.shift();
+}
+if (this._isLazyAttr(name)) {
+this._addLazyAttr(name);
+}
+initialSet = (!data.value || !(name in data.value));
+if (!this.attrAdded(name)) {
+} else {
+if (!initialSet && !force) {
+if (conf.get(name, WRITE_ONCE)) {
+allowSet = false;
+}
+if (conf.get(name, READ_ONLY)) {
+allowSet = false;
+}
+}
+if (allowSet) {
+currVal = this.get(name);
+if (path) {
+val = O.setValue(Y.clone(currVal), path, val);
+if (val === undefined) {
+allowSet = false;
+}
+}
+if (allowSet) {
+if (conf.get(name, INITIALIZING)) {
+this._setAttrVal(name, strPath, currVal, val);
+} else {
+this._fireAttrChange(name, strPath, currVal, val, opts);
+}
+}
+}
+}
+return this;
+},
+/**
+* Utility method to help setup the event payload and fire the attribute change event.
+*
+* @method _fireAttrChange
+* @private
+* @param {String} attrName The name of the attribute
+* @param {String} subAttrName The full path of the property being changed,
+* if this is a sub-attribute value being change. Otherwise null.
+* @param {Any} currVal The current value of the attribute
+* @param {Any} newVal The new value of the attribute
+* @param {Object} opts Any additional event data to mix into the attribute change event's event facade.
+*/
+_fireAttrChange : function(attrName, subAttrName, currVal, newVal, opts) {
+var eventName = attrName + CHANGE,
+conf = this._conf,
+facade;
+if (!conf.get(attrName, PUBLISHED)) {
+this.publish(eventName, {
+queuable:false,
+defaultFn:this._defAttrChangeFn,
+silent:true,
+broadcast : conf.get(attrName, BROADCAST)
+});
+conf.add(attrName, PUBLISHED, true);
+}
+facade = (opts) ? Y.merge(opts) : this._ATTR_E_FACADE;
+facade.type = eventName;
+facade.attrName = attrName;
+facade.subAttrName = subAttrName;
+facade.prevVal = currVal;
+facade.newVal = newVal;
+this.fire(facade);
+},
+/**
+* Default function for attribute change events.
+*
+* @private
+* @method _defAttrChangeFn
+* @param {EventFacade} e The event object for attribute change events.
+*/
+_defAttrChangeFn : function(e) {
+if (!this._setAttrVal(e.attrName, e.subAttrName, e.prevVal, e.newVal)) {
+// Prevent "after" listeners from being invoked since nothing changed.
+e.stopImmediatePropagation();
+} else {
+e.newVal = this._conf.get(e.attrName, VALUE);
+}
+},
+/**
+* Updates the stored value of the attribute in the privately held State object,
+* if validation and setter passes.
+*
+* @method _setAttrVal
+* @private
+* @param {String} attrName The attribute name.
+* @param {String} subAttrName The sub-attribute name, if setting a sub-attribute property ("x.y.z").
+* @param {Any} prevVal The currently stored value of the attribute.
+* @param {Any} newVal The value which is going to be stored.
+*
+* @return {booolean} true if the new attribute value was stored, false if not.
+*/
+_setAttrVal : function(attrName, subAttrName, prevVal, newVal) {
+var allowSet = true,
+conf = this._conf,
+validator  = conf.get(attrName, VALIDATOR),
+setter = conf.get(attrName, SETTER),
+initializing = conf.get(attrName, INITIALIZING),
+name = subAttrName || attrName,
+retVal;
+if (validator) {
+var valid = validator.call(this, newVal, name);
+if (!valid && initializing) {
+newVal = conf.get(attrName, DEF_VALUE);
+valid = true; // Assume it's valid, for perf.
+}
+}
+if (!validator || valid) {
+if (setter) {
+retVal = setter.call(this, newVal, name);
+if (retVal === INVALID_VALUE) {
+allowSet = false;
+} else if (retVal !== undefined){
+newVal = retVal;
+}
+}
+if (allowSet) {
+if(!subAttrName && newVal === prevVal) {
+allowSet = false;
+} else {
+// Store value
+if (conf.get(attrName, INIT_VALUE) === undefined) {
+conf.add(attrName, INIT_VALUE, newVal);
+}
+conf.add(attrName, VALUE, newVal);
+}
+}
+} else {
+allowSet = false;
+}
+return allowSet;
+},
+/**
+* Sets multiple attribute values.
+*
+* @method setAttrs
+* @param {Object} attrs  An object with attributes name/value pairs.
+* @return {Object} A reference to the host object.
+* @chainable
+*/
+setAttrs : function(attrs) {
+for (var attr in attrs) {
+if ( attrs.hasOwnProperty(attr) ) {
+this.set(attr, attrs[attr]);
+}
+}
+return this;
+},
+/**
+* Gets multiple attribute values.
+*
+* @method getAttrs
+* @param {Array | boolean} attrs Optional. An array of attribute names. If omitted, all attribute values are
+* returned. If set to true, all attributes modified from their initial values are returned.
+* @return {Object} An object with attribute name/value pairs.
+*/
+getAttrs : function(attrs) {
+var o = {}, i, l, attr, val,
+modifiedOnly = (attrs === true);
+attrs = (attrs && !modifiedOnly) ? attrs : O.keys(this._conf.data.added);
+for (i = 0, l = attrs.length; i < l; i++) {
+// Go through get, to honor cloning/normalization
+attr = attrs[i];
+val = this.get(attr);
+if (!modifiedOnly || this._conf.get(attr, VALUE) != this._conf.get(attr, INIT_VALUE)) {
+o[attr] = this.get(attr);
+}
+}
+return o;
+},
+/**
+* Configures a group of attributes, and sets initial values.
+*
+* <p>
+* <strong>NOTE:</strong> This method does not isolate the configuration object by merging/cloning.
+* The caller is responsible for merging/cloning the configuration object if required.
+* </p>
+*
+* @method addAttrs
+* @chainable
+*
+* @param {Object} cfgs An object with attribute name/configuration pairs.
+* @param {Object} values An object with attribute name/value pairs, defining the initial values to apply.
+* Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.
+* @param {boolean} lazy Whether or not to delay the intialization of these attributes until the first call to get/set.
+* Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration.
+* See <a href="#method_addAttr">addAttr</a>.
+*
+* @return {Object} A reference to the host object.
+*/
+addAttrs : function(cfgs, values, lazy) {
+if (cfgs) {
+this._tCfgs = cfgs;
+this._tVals = this._splitAttrVals(values);
+this._addAttrs(cfgs, this._tVals, lazy);
+this._tCfgs = this._tVals = null;
+}
+return this;
+},
+/**
+* Implementation behind the public addAttrs method.
+*
+* This method is invoked directly by get if it encounters a scenario
+* in which an attribute's valueFn attempts to obtain the
+* value an attribute in the same group of attributes, which has not yet
+* been added (on demand initialization).
+*
+* @method _addAttrs
+* @private
+* @param {Object} cfgs An object with attribute name/configuration pairs.
+* @param {Object} values An object with attribute name/value pairs, defining the initial values to apply.
+* Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.
+* @param {boolean} lazy Whether or not to delay the intialization of these attributes until the first call to get/set.
+* Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration.
+* See <a href="#method_addAttr">addAttr</a>.
+*/
+_addAttrs : function(cfgs, values, lazy) {
+var attr,
+attrCfg,
+value;
+for (attr in cfgs) {
+if (cfgs.hasOwnProperty(attr)) {
+// Not Merging. Caller is responsible for isolating configs
+attrCfg = cfgs[attr];
+attrCfg.defaultValue = attrCfg.value;
+// Handle simple, complex and user values, accounting for read-only
+value = this._getAttrInitVal(attr, attrCfg, this._tVals);
+if (value !== undefined) {
+attrCfg.value = value;
+}
+if (this._tCfgs[attr]) {
+delete this._tCfgs[attr];
+}
+this.addAttr(attr, attrCfg, lazy);
+}
+}
+},
+/**
+* Utility method to split out simple attribute name/value pairs ("x")
+* from complex attribute name/value pairs ("x.y.z"), so that complex
+* attributes can be keyed by the top level attribute name.
+*
+* @method _splitAttrVals
+* @param {Object} valueHash An object with attribute name/value pairs
+*
+* @return {Object} An object literal with 2 properties - "simple" and "complex",
+* containing simple and complex attribute values respectively keyed
+* by the top level attribute name, or null, if valueHash is falsey.
+*
+* @private
+*/
+_splitAttrVals : function(valueHash) {
+var vals = {},
+subvals = {},
+path,
+attr,
+v, k;
+if (valueHash) {
+for (k in valueHash) {
+if (valueHash.hasOwnProperty(k)) {
+if (k.indexOf(DOT) !== -1) {
+path = k.split(DOT);
+attr = path.shift();
+v = subvals[attr] = subvals[attr] || [];
+v[v.length] = {
+path : path,
+value: valueHash[k]
+};
+} else {
+vals[k] = valueHash[k];
+}
+}
+}
+return { simple:vals, complex:subvals };
+} else {
+return null;
+}
+},
+/**
+* Returns the initial value of the given attribute from
+* either the default configuration provided, or the
+* over-ridden value if it exists in the set of initValues
+* provided and the attribute is not read-only.
+*
+* @param {String} attr The name of the attribute
+* @param {Object} cfg The attribute configuration object
+* @param {Object} initValues The object with simple and complex attribute name/value pairs returned from _splitAttrVals
+*
+* @return {Any} The initial value of the attribute.
+*
+* @method _getAttrInitVal
+* @private
+*/
+_getAttrInitVal : function(attr, cfg, initValues) {
+var val = (cfg.valueFn) ? cfg.valueFn.call(this) : cfg.value,
+simple,
+complex,
+i,
+l,
+path,
+subval,
+subvals;
+if (!cfg.readOnly && initValues) {
+// Simple Attributes
+simple = initValues.simple;
+if (simple && simple.hasOwnProperty(attr)) {
+val = simple[attr];
+}
+// Complex Attributes (complex values applied, after simple, incase both are set)
+complex = initValues.complex;
+if (complex && complex.hasOwnProperty(attr)) {
+subvals = complex[attr];
+for (i = 0, l = subvals.length; i < l; ++i) {
+path = subvals[i].path;
+subval = subvals[i].value;
+O.setValue(val, path, subval);
+}
+}
+}
+return val;
+}
+};
+// Basic prototype augment - no lazy constructor invocation.
+Y.mix(Attribute, EventTarget, false, null, 1);
+Y.Attribute = Attribute;
+}, '3.0.0b1' ,{requires:['event-custom']});

comt