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✏️ Editing: attribute-observable.js

YUI.add('attribute-observable', function (Y, NAME) {

/*For log lines*/
    /*jshint maxlen:200*/

/**
     * 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
     */

/**
     * The `attribute-observable` submodule provides augmentable attribute change event support
     * for AttributeCore based implementations.
     *
     * @module attribute
     * @submodule attribute-observable
     */
    var EventTarget = Y.EventTarget,

CHANGE = "Change",
        BROADCAST = "broadcast";

/**
     * Provides an augmentable implementation of attribute change events for
     * AttributeCore.
     *
     * @class AttributeObservable
     * @extensionfor AttributeCore
     * @uses EventTarget
     */
    function AttributeObservable() {
        // Perf tweak - avoid creating event literals if not required.
        this._ATTR_E_FACADE = {};

EventTarget.call(this, {emitFacade:true});
    }

AttributeObservable._ATTR_CFG = [BROADCAST];

AttributeObservable.prototype = {

/**
         * 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);
        },

/**
         * 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);
        },

/**
         * Sets multiple attribute values.
         *
         * @method setAttrs
         * @param {Object} attrs  An object with attributes name/value pairs.
         * @param {Object} opts  Properties to mix into the event payload. These are shared and mixed into each set
         * @return {Object} A reference to the host object.
         * @chainable
         */
        setAttrs : function(attrs, opts) {
            return this._setAttrs(attrs, opts);
        },

/**
         * Implementation behind the public setAttrs method, to set multiple attribute values.
         *
         * @method _setAttrs
         * @protected
         * @param {Object} attrs  An object with attributes name/value pairs.
         * @param {Object} opts  Properties to mix into the event payload. These are shared and mixed into each set
         * @return {Object} A reference to the host object.
         * @chainable
         */
        _setAttrs : function(attrs, opts) {
            var attr;
            for (attr in attrs) {
                if ( attrs.hasOwnProperty(attr) ) {
                    this.set(attr, attrs[attr], 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.
         * @param {Object} [cfg] The attribute config stored in State, if already available.
         */
        _fireAttrChange : function(attrName, subAttrName, currVal, newVal, opts, cfg) {
            var host = this,
                eventName = this._getFullType(attrName + CHANGE),
                state = host._state,
                facade,
                broadcast,
                e;

if (!cfg) {
                cfg = state.data[attrName] || {};
            }

if (!cfg.published) {

// PERF: Using lower level _publish() for
                // critical path performance
                e = host._publish(eventName);

e.emitFacade = true;
                e.defaultTargetOnly = true;
                e.defaultFn = host._defAttrChangeFn;

broadcast = cfg.broadcast;
                if (broadcast !== undefined) {
                    e.broadcast = broadcast;
                }

cfg.published = true;
            }

if (opts) {
                facade = Y.merge(opts);
                facade._attrOpts = opts;
            } else {
                facade = host._ATTR_E_FACADE;
            }

// Not using the single object signature for fire({type:..., newVal:...}), since
            // we don't want to override type. Changed to the fire(type, {newVal:...}) signature.

facade.attrName = attrName;
            facade.subAttrName = subAttrName;
            facade.prevVal = currVal;
            facade.newVal = newVal;

if (host._hasPotentialSubscribers(eventName)) {
                host.fire(eventName, facade);
            } else {
                this._setAttrVal(attrName, subAttrName, currVal, newVal, opts, cfg);
            }
        },

/**
         * Default function for attribute change events.
         *
         * @private
         * @method _defAttrChangeFn
         * @param {EventFacade} e The event object for attribute change events.
         * @param {boolean} eventFastPath Whether or not we're using this as a fast path in the case of no listeners or not
         */
        _defAttrChangeFn : function(e, eventFastPath) {

var opts = e._attrOpts;
            if (opts) {
                delete e._attrOpts;
            }

if (!this._setAttrVal(e.attrName, e.subAttrName, e.prevVal, e.newVal, opts)) {

if (!eventFastPath) {
                    // Prevent "after" listeners from being invoked since nothing changed.
                    e.stopImmediatePropagation();
                }

} else {
                if (!eventFastPath) {
                    e.newVal = this.get(e.attrName);
                }
            }
        }
    };

// Basic prototype augment - no lazy constructor invocation.
    Y.mix(AttributeObservable, EventTarget, false, null, 1);

Y.AttributeObservable = AttributeObservable;

/**
    The `AttributeEvents` class extension was deprecated in YUI 3.8.0 and is now
    an alias for the `AttributeObservable` class extension. Use that class
    extnesion instead. This alias will be removed in a future version of YUI.

@class AttributeEvents
    @uses EventTarget
    @deprecated Use `AttributeObservable` instead.
    @see AttributeObservable
    **/
    Y.AttributeEvents = AttributeObservable;

}, '3.18.1', {"requires": ["event-custom"]});

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