3 Copyright 2012 Yahoo! Inc. All rights reserved.
4 Licensed under the BSD License.
5 http://yuilibrary.com/license/
7 YUI.add('attribute-core', function (Y, NAME) {
10 * The State class maintains state for a collection of named items, with
11 * a varying number of properties defined.
13 * It avoids the need to create a separate class for the item, and separate instances
14 * of these classes for each item, by storing the state in a 2 level hash table,
15 * improving performance when the number of items is likely to be large.
20 Y.State = function() {
31 * Adds a property to an item.
34 * @param name {String} The name of the item.
35 * @param key {String} The name of the property.
36 * @param val {Any} The value of the property.
38 add: function(name, key, val) {
39 var item = this.data[name];
42 item = this.data[name] = {};
49 * Adds multiple properties to an item.
52 * @param name {String} The name of the item.
53 * @param obj {Object} A hash of property/value pairs.
55 addAll: function(name, obj) {
56 var item = this.data[name],
60 item = this.data[name] = {};
64 if (obj.hasOwnProperty(key)) {
71 * Removes a property from an item.
74 * @param name {String} The name of the item.
75 * @param key {String} The property to remove.
77 remove: function(name, key) {
78 var item = this.data[name];
86 * Removes multiple properties from an item, or removes the item completely.
89 * @param name {String} The name of the item.
90 * @param obj {Object|Array} Collection of properties to delete. If not provided, the entire item is removed.
92 removeAll: function(name, obj) {
102 Y.each(obj, function(value, key) {
103 this.remove(name, typeof key === 'string' ? key : value);
109 * For a given item, returns the value of the property requested, or undefined if not found.
112 * @param name {String} The name of the item
113 * @param key {String} Optional. The property value to retrieve.
114 * @return {Any} The value of the supplied property.
116 get: function(name, key) {
117 var item = this.data[name];
125 * For the given item, returns an object with all of the
126 * item's property/value pairs. By default the object returned
127 * is a shallow copy of the stored data, but passing in true
128 * as the second parameter will return a reference to the stored
132 * @param name {String} The name of the item
133 * @param reference {boolean} true, if you want a reference to the stored
135 * @return {Object} An object with property/value pairs for the item.
137 getAll : function(name, reference) {
138 var item = this.data[name],
147 if (item.hasOwnProperty(key)) {
148 obj[key] = item[key];
157 * The attribute module provides an augmentable Attribute implementation, which
158 * adds configurable attributes and attribute change events to the class being
159 * augmented. It also provides a State class, which is used internally by Attribute,
160 * but can also be used independently to provide a name/property/value data structure to
167 * The attribute-core submodule provides the lightest level of attribute handling support
168 * without Attribute change events, or lesser used methods such as reset(), modifyAttrs(),
172 * @submodule attribute-core
179 // Externally configurable props
182 READ_ONLY = "readOnly",
183 WRITE_ONCE = "writeOnce",
184 INIT_ONLY = "initOnly",
185 VALIDATOR = "validator",
187 VALUE_FN = "valueFn",
188 LAZY_ADD = "lazyAdd",
190 // Used for internal state management
192 BYPASS_PROXY = "_bypassProxy",
193 INITIALIZING = "initializing",
194 INIT_VALUE = "initValue",
196 IS_LAZY_ADD = "isLazyAdd",
202 * AttributeCore provides the lightest level of configurable attribute support. It is designed to be
203 * augmented on to a host class, and provides the host with the ability to configure
204 * attributes to store and retrieve state, <strong>but without support for attribute change events</strong>.
206 * <p>For example, attributes added to the host can be configured:</p>
208 * <li>As read only.</li>
209 * <li>As write once.</li>
210 * <li>With a setter function, which can be used to manipulate
211 * values passed to Attribute's <a href="#method_set">set</a> method, before they are stored.</li>
212 * <li>With a getter function, which can be used to manipulate stored values,
213 * before they are returned by Attribute's <a href="#method_get">get</a> method.</li>
214 * <li>With a validator function, to validate values before they are stored.</li>
217 * <p>See the <a href="#method_addAttr">addAttr</a> method, for the complete set of configuration
218 * options available for attributes.</p>
220 * <p>Object/Classes based on AttributeCore can augment <a href="AttributeEvents.html">AttributeEvents</a>
221 * (with true for overwrite) and <a href="AttributeExtras.html">AttributeExtras</a> to add attribute event and
222 * additional, less commonly used attribute methods, such as `modifyAttr`, `removeAttr` and `reset`.</p>
224 * @class AttributeCore
225 * @param attrs {Object} The attributes to add during construction (passed through to <a href="#method_addAttrs">addAttrs</a>). These can also be defined on the constructor being augmented with Attribute by defining the ATTRS property on the constructor.
226 * @param values {Object} The initial attribute values to apply (passed through to <a href="#method_addAttrs">addAttrs</a>). These are not merged/cloned. The caller is responsible for isolating user provided values if required.
227 * @param lazy {boolean} Whether or not to add attributes lazily (passed through to <a href="#method_addAttrs">addAttrs</a>).
229 function AttributeCore(attrs, values, lazy) {
230 this._initAttrHost(attrs, values, lazy);
234 * <p>The value to return from an attribute setter in order to prevent the set from going through.</p>
236 * <p>You can return this value from your setter if you wish to combine validator and setter
237 * functionality into a single setter function, which either returns the massaged value to be stored or
238 * AttributeCore.INVALID_VALUE to prevent invalid values from being stored.</p>
240 * @property INVALID_VALUE
245 AttributeCore.INVALID_VALUE = {};
246 INVALID_VALUE = AttributeCore.INVALID_VALUE;
249 * The list of properties which can be configured for
250 * each attribute (e.g. setter, getter, writeOnce etc.).
252 * This property is used internally as a whitelist for faster
255 * @property _ATTR_CFG
260 AttributeCore._ATTR_CFG = [SETTER, GETTER, VALIDATOR, VALUE, VALUE_FN, WRITE_ONCE, READ_ONLY, LAZY_ADD, BYPASS_PROXY];
262 AttributeCore.prototype = {
265 * Constructor logic for attributes. Initializes the host state, and sets up the inital attributes passed to the
268 * @method _initAttrHost
269 * @param attrs {Object} The attributes to add during construction (passed through to <a href="#method_addAttrs">addAttrs</a>). These can also be defined on the constructor being augmented with Attribute by defining the ATTRS property on the constructor.
270 * @param values {Object} The initial attribute values to apply (passed through to <a href="#method_addAttrs">addAttrs</a>). These are not merged/cloned. The caller is responsible for isolating user provided values if required.
271 * @param lazy {boolean} Whether or not to add attributes lazily (passed through to <a href="#method_addAttrs">addAttrs</a>).
274 _initAttrHost : function(attrs, values, lazy) {
275 this._state = new Y.State();
276 this._initAttrs(attrs, values, lazy);
281 * Adds an attribute with the provided configuration to the host object.
284 * The config argument object supports the following properties:
288 * <dt>value <Any></dt>
289 * <dd>The initial value to set on the attribute</dd>
291 * <dt>valueFn <Function | String></dt>
293 * <p>A function, which will return the initial value to set on the attribute. This is useful
294 * for cases where the attribute configuration is defined statically, but needs to
295 * reference the host instance ("this") to obtain an initial value. If both the value and valueFn properties are defined,
296 * the value returned by the valueFn has precedence over the value property, unless it returns undefined, in which
297 * case the value property is used.</p>
299 * <p>valueFn can also be set to a string, representing the name of the instance method to be used to retrieve the value.</p>
302 * <dt>readOnly <boolean></dt>
303 * <dd>Whether or not the attribute is read only. Attributes having readOnly set to true
304 * cannot be modified by invoking the set method.</dd>
306 * <dt>writeOnce <boolean> or <string></dt>
308 * Whether or not the attribute is "write once". Attributes having writeOnce set to true,
309 * can only have their values set once, be it through the default configuration,
310 * constructor configuration arguments, or by invoking set.
311 * <p>The writeOnce attribute can also be set to the string "initOnly", in which case the attribute can only be set during initialization
312 * (when used with Base, this means it can only be set during construction)</p>
315 * <dt>setter <Function | String></dt>
317 * <p>The setter function used to massage or normalize the value passed to the set method for the attribute.
318 * The value returned by the setter will be the final stored value. Returning
319 * <a href="#property_Attribute.INVALID_VALUE">Attribute.INVALID_VALUE</a>, from the setter will prevent
320 * the value from being stored.
323 * <p>setter can also be set to a string, representing the name of the instance method to be used as the setter function.</p>
326 * <dt>getter <Function | String></dt>
329 * The getter function used to massage or normalize the value returned by the get method for the attribute.
330 * The value returned by the getter function is the value which will be returned to the user when they
334 * <p>getter can also be set to a string, representing the name of the instance method to be used as the getter function.</p>
337 * <dt>validator <Function | String></dt>
340 * The validator function invoked prior to setting the stored value. Returning
341 * false from the validator function will prevent the value from being stored.
344 * <p>validator can also be set to a string, representing the name of the instance method to be used as the validator function.</p>
347 * <dt>lazyAdd <boolean></dt>
348 * <dd>Whether or not to delay initialization of the attribute until the first call to get/set it.
349 * This flag can be used to over-ride lazy initialization on a per attribute basis, when adding multiple attributes through
350 * the <a href="#method_addAttrs">addAttrs</a> method.</dd>
354 * <p>The setter, getter and validator are invoked with the value and name passed in as the first and second arguments, and with
355 * the context ("this") set to the host object.</p>
357 * <p>Configuration properties outside of the list mentioned above are considered private properties used internally by attribute,
358 * and are not intended for public use.</p>
362 * @param {String} name The name of the attribute.
363 * @param {Object} config An object with attribute configuration property/value pairs, specifying the configuration for the attribute.
366 * <strong>NOTE:</strong> The configuration object is modified when adding an attribute, so if you need
367 * to protect the original values, you will need to merge the object.
370 * @param {boolean} lazy (optional) Whether or not to add this attribute lazily (on the first call to get/set).
372 * @return {Object} A reference to the host object.
376 addAttr: function(name, config, lazy) {
378 Y.log('Adding attribute: ' + name, 'info', 'attribute');
380 var host = this, // help compression
385 config = config || {};
387 lazy = (LAZY_ADD in config) ? config[LAZY_ADD] : lazy;
389 if (lazy && !host.attrAdded(name)) {
396 if (host.attrAdded(name) && !state.get(name, IS_LAZY_ADD)) { Y.log('Attribute: ' + name + ' already exists. Cannot add it again without removing it first', 'warn', 'attribute'); }
398 if (!host.attrAdded(name) || state.get(name, IS_LAZY_ADD)) {
400 hasValue = (VALUE in config);
402 if (config.readOnly && !hasValue) { Y.log('readOnly attribute: ' + name + ', added without an initial value. Value will be set on initial call to set', 'warn', 'attribute');}
405 // We'll go through set, don't want to set value in config directly
406 value = config.value;
411 config.initializing = true;
413 state.addAll(name, config);
416 // Go through set, so that raw values get normalized/validated
417 host.set(name, value);
420 state.remove(name, INITIALIZING);
428 * Checks if the given attribute has been added to the host
431 * @param {String} name The name of the attribute to check.
432 * @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.
434 attrAdded: function(name) {
435 return !!this._state.get(name, ADDED);
439 * Returns the current value of the attribute. If the attribute
440 * has been configured with a 'getter' function, this method will delegate
441 * to the 'getter' to obtain the value of the attribute.
445 * @param {String} name The name of the attribute. If the value of the attribute is an Object,
446 * dot notation can be used to obtain the value of a property of the object (e.g. <code>get("x.y.z")</code>)
448 * @return {Any} The value of the attribute
450 get : function(name) {
451 return this._getAttr(name);
455 * Checks whether or not the attribute is one which has been
456 * added lazily and still requires initialization.
458 * @method _isLazyAttr
460 * @param {String} name The name of the attribute
461 * @return {boolean} true if it's a lazily added attribute, false otherwise.
463 _isLazyAttr: function(name) {
464 return this._state.get(name, LAZY);
468 * Finishes initializing an attribute which has been lazily added.
470 * @method _addLazyAttr
472 * @param {Object} name The name of the attribute
474 _addLazyAttr: function(name, cfg) {
475 var state = this._state,
476 lazyCfg = state.get(name, LAZY);
478 state.add(name, IS_LAZY_ADD, true);
479 state.remove(name, LAZY);
480 this.addAttr(name, lazyCfg);
484 * Sets the value of an attribute.
489 * @param {String} name The name of the attribute. If the
490 * current value of the attribute is an Object, dot notation can be used
491 * to set the value of a property within the object (e.g. <code>set("x.y.z", 5)</code>).
493 * @param {Any} value The value to set the attribute to.
495 * @return {Object} A reference to the host object.
497 set : function(name, val) {
498 return this._setAttr(name, val);
502 * Allows setting of readOnly/writeOnce attributes. See <a href="#method_set">set</a> for argument details.
508 * @param {String} name The name of the attribute.
509 * @param {Any} val The value to set the attribute to.
510 * @return {Object} A reference to the host object.
512 _set : function(name, val) {
513 return this._setAttr(name, val, null, true);
517 * Provides the common implementation for the public set and protected _set methods.
519 * See <a href="#method_set">set</a> for argument details.
525 * @param {String} name The name of the attribute.
526 * @param {Any} value The value to set the attribute to.
527 * @param {Object} opts (Optional) Optional event data to be mixed into
528 * the event facade passed to subscribers of the attribute's change event.
529 * This is currently a hack. There's no real need for the AttributeCore implementation
530 * to support this parameter, but breaking it out into AttributeEvents, results in
531 * additional function hops for the critical path.
532 * @param {boolean} force If true, allows the caller to set values for
533 * readOnly or writeOnce attributes which have already been set.
535 * @return {Object} A reference to the host object.
537 _setAttr : function(name, val, opts, force) {
539 // HACK - no real reason core needs to know about opts, but
540 // it adds fn hops if we want to break it out.
541 // Not sure it's worth it for this critical path
545 stateProxy = this._stateProxy,
554 if (name.indexOf(DOT) !== -1) {
556 path = name.split(DOT);
560 if (this._isLazyAttr(name)) {
561 this._addLazyAttr(name);
564 cfg = state.getAll(name, true) || {};
566 initialSet = (!(VALUE in cfg));
568 if (stateProxy && name in stateProxy && !cfg._bypassProxy) {
569 // TODO: Value is always set for proxy. Can we do any better? Maybe take a snapshot as the initial value for the first call to set?
573 writeOnce = cfg.writeOnce;
574 initializing = cfg.initializing;
576 if (!initialSet && !force) {
579 Y.log('Set attribute:' + name + ', aborted; Attribute is writeOnce', 'warn', 'attribute');
584 Y.log('Set attribute:' + name + ', aborted; Attribute is readOnly', 'warn', 'attribute');
589 if (!initializing && !force && writeOnce === INIT_ONLY) {
590 Y.log('Set attribute:' + name + ', aborted; Attribute is writeOnce: "initOnly"', 'warn', 'attribute');
595 // Don't need currVal if initialSet (might fail in custom getter if it always expects a non-undefined/non-null value)
597 currVal = this.get(name);
601 val = O.setValue(Y.clone(currVal), path, val);
603 if (val === undefined) {
604 Y.log('Set attribute path:' + strPath + ', aborted; Path is invalid', 'warn', 'attribute');
610 if (!this._fireAttrChange || initializing) {
611 this._setAttrVal(name, strPath, currVal, val);
613 // HACK - no real reason core needs to know about _fireAttrChange, but
614 // it adds fn hops if we want to break it out. Not sure it's worth it for this critical path
615 this._fireAttrChange(name, strPath, currVal, val, opts);
624 * Provides the common implementation for the public get method,
625 * allowing Attribute hosts to over-ride either method.
627 * See <a href="#method_get">get</a> for argument details.
633 * @param {String} name The name of the attribute.
634 * @return {Any} The value of the attribute.
636 _getAttr : function(name) {
637 var host = this, // help compression
645 if (name.indexOf(DOT) !== -1) {
646 path = name.split(DOT);
650 // On Demand - Should be rare - handles out of order valueFn references
651 if (host._tCfgs && host._tCfgs[name]) {
653 cfg[name] = host._tCfgs[name];
654 delete host._tCfgs[name];
655 host._addAttrs(cfg, host._tVals);
659 if (host._isLazyAttr(name)) {
660 host._addLazyAttr(name);
663 val = host._getStateVal(name);
665 getter = state.get(name, GETTER);
667 if (getter && !getter.call) {
668 getter = this[getter];
671 val = (getter) ? getter.call(host, val, fullName) : val;
672 val = (path) ? O.getValue(val, path) : val;
678 * Gets the stored value for the attribute, from either the
679 * internal state object, or the state proxy if it exits
681 * @method _getStateVal
683 * @param {String} name The name of the attribute
684 * @return {Any} The stored value of the attribute
686 _getStateVal : function(name) {
687 var stateProxy = this._stateProxy;
688 return stateProxy && (name in stateProxy) && !this._state.get(name, BYPASS_PROXY) ? stateProxy[name] : this._state.get(name, VALUE);
692 * Sets the stored value for the attribute, in either the
693 * internal state object, or the state proxy if it exits
695 * @method _setStateVal
697 * @param {String} name The name of the attribute
698 * @param {Any} value The value of the attribute
700 _setStateVal : function(name, value) {
701 var stateProxy = this._stateProxy;
702 if (stateProxy && (name in stateProxy) && !this._state.get(name, BYPASS_PROXY)) {
703 stateProxy[name] = value;
705 this._state.add(name, VALUE, value);
710 * Updates the stored value of the attribute in the privately held State object,
711 * if validation and setter passes.
713 * @method _setAttrVal
715 * @param {String} attrName The attribute name.
716 * @param {String} subAttrName The sub-attribute name, if setting a sub-attribute property ("x.y.z").
717 * @param {Any} prevVal The currently stored value of the attribute.
718 * @param {Any} newVal The value which is going to be stored.
720 * @return {booolean} true if the new attribute value was stored, false if not.
722 _setAttrVal : function(attrName, subAttrName, prevVal, newVal) {
726 cfg = this._state.getAll(attrName, true) || {},
727 validator = cfg.validator,
729 initializing = cfg.initializing,
730 prevRawVal = this._getStateVal(attrName),
731 name = subAttrName || attrName,
736 if (!validator.call) {
737 // Assume string - trying to keep critical path tight, so avoiding Lang check
738 validator = this[validator];
741 valid = validator.call(host, newVal, name);
743 if (!valid && initializing) {
744 newVal = cfg.defaultValue;
745 valid = true; // Assume it's valid, for perf.
750 if (!validator || valid) {
753 // Assume string - trying to keep critical path tight, so avoiding Lang check
754 setter = this[setter];
757 retVal = setter.call(host, newVal, name);
759 if (retVal === INVALID_VALUE) {
760 Y.log('Attribute: ' + attrName + ', setter returned Attribute.INVALID_VALUE for value:' + newVal, 'warn', 'attribute');
762 } else if (retVal !== undefined){
763 Y.log('Attribute: ' + attrName + ', raw value: ' + newVal + ' modified by setter to:' + retVal, 'info', 'attribute');
770 if(!subAttrName && (newVal === prevRawVal) && !Lang.isObject(newVal)) {
771 Y.log('Attribute: ' + attrName + ', value unchanged:' + newVal, 'warn', 'attribute');
775 if (!(INIT_VALUE in cfg)) {
776 cfg.initValue = newVal;
778 host._setStateVal(attrName, newVal);
783 Y.log('Attribute:' + attrName + ', Validation failed for value:' + newVal, 'warn', 'attribute');
791 * Sets multiple attribute values.
794 * @param {Object} attrs An object with attributes name/value pairs.
795 * @return {Object} A reference to the host object.
798 setAttrs : function(attrs) {
799 return this._setAttrs(attrs);
803 * Implementation behind the public setAttrs method, to set multiple attribute values.
807 * @param {Object} attrs An object with attributes name/value pairs.
808 * @return {Object} A reference to the host object.
811 _setAttrs : function(attrs) {
813 for (attr in attrs) {
814 if ( attrs.hasOwnProperty(attr) ) {
815 this.set(attr, attrs[attr]);
822 * Gets multiple attribute values.
825 * @param {Array | boolean} attrs Optional. An array of attribute names. If omitted, all attribute values are
826 * returned. If set to true, all attributes modified from their initial values are returned.
827 * @return {Object} An object with attribute name/value pairs.
829 getAttrs : function(attrs) {
830 return this._getAttrs(attrs);
834 * Implementation behind the public getAttrs method, to get multiple attribute values.
838 * @param {Array | boolean} attrs Optional. An array of attribute names. If omitted, all attribute values are
839 * returned. If set to true, all attributes modified from their initial values are returned.
840 * @return {Object} An object with attribute name/value pairs.
842 _getAttrs : function(attrs) {
845 modifiedOnly = (attrs === true);
847 // TODO - figure out how to get all "added"
848 if (!attrs || modifiedOnly) {
849 attrs = O.keys(this._state.data);
852 for (i = 0, len = attrs.length; i < len; i++) {
855 if (!modifiedOnly || this._getStateVal(attr) != this._state.get(attr, INIT_VALUE)) {
856 // Go through get, to honor cloning/normalization
857 obj[attr] = this.get(attr);
865 * Configures a group of attributes, and sets initial values.
868 * <strong>NOTE:</strong> This method does not isolate the configuration object by merging/cloning.
869 * The caller is responsible for merging/cloning the configuration object if required.
875 * @param {Object} cfgs An object with attribute name/configuration pairs.
876 * @param {Object} values An object with attribute name/value pairs, defining the initial values to apply.
877 * Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.
878 * @param {boolean} lazy Whether or not to delay the intialization of these attributes until the first call to get/set.
879 * Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration.
880 * See <a href="#method_addAttr">addAttr</a>.
882 * @return {Object} A reference to the host object.
884 addAttrs : function(cfgs, values, lazy) {
885 var host = this; // help compression
888 host._tVals = host._normAttrVals(values);
889 host._addAttrs(cfgs, host._tVals, lazy);
890 host._tCfgs = host._tVals = null;
897 * Implementation behind the public addAttrs method.
899 * This method is invoked directly by get if it encounters a scenario
900 * in which an attribute's valueFn attempts to obtain the
901 * value an attribute in the same group of attributes, which has not yet
902 * been added (on demand initialization).
906 * @param {Object} cfgs An object with attribute name/configuration pairs.
907 * @param {Object} values An object with attribute name/value pairs, defining the initial values to apply.
908 * Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.
909 * @param {boolean} lazy Whether or not to delay the intialization of these attributes until the first call to get/set.
910 * Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration.
911 * See <a href="#method_addAttr">addAttr</a>.
913 _addAttrs : function(cfgs, values, lazy) {
914 var host = this, // help compression
920 if (cfgs.hasOwnProperty(attr)) {
922 // Not Merging. Caller is responsible for isolating configs
923 attrCfg = cfgs[attr];
924 attrCfg.defaultValue = attrCfg.value;
926 // Handle simple, complex and user values, accounting for read-only
927 value = host._getAttrInitVal(attr, attrCfg, host._tVals);
929 if (value !== undefined) {
930 attrCfg.value = value;
933 if (host._tCfgs[attr]) {
934 delete host._tCfgs[attr];
937 host.addAttr(attr, attrCfg, lazy);
943 * Utility method to protect an attribute configuration
944 * hash, by merging the entire object and the individual
945 * attr config objects.
947 * @method _protectAttrs
949 * @param {Object} attrs A hash of attribute to configuration object pairs.
950 * @return {Object} A protected version of the attrs argument.
952 _protectAttrs : function(attrs) {
954 attrs = Y.merge(attrs);
955 for (var attr in attrs) {
956 if (attrs.hasOwnProperty(attr)) {
957 attrs[attr] = Y.merge(attrs[attr]);
965 * Utility method to normalize attribute values. The base implementation
966 * simply merges the hash to protect the original.
968 * @method _normAttrVals
969 * @param {Object} valueHash An object with attribute name/value pairs
975 _normAttrVals : function(valueHash) {
976 return (valueHash) ? Y.merge(valueHash) : null;
980 * Returns the initial value of the given attribute from
981 * either the default configuration provided, or the
982 * over-ridden value if it exists in the set of initValues
983 * provided and the attribute is not read-only.
985 * @param {String} attr The name of the attribute
986 * @param {Object} cfg The attribute configuration object
987 * @param {Object} initValues The object with simple and complex attribute name/value pairs returned from _normAttrVals
989 * @return {Any} The initial value of the attribute.
991 * @method _getAttrInitVal
994 _getAttrInitVal : function(attr, cfg, initValues) {
996 // init value is provided by the user if it exists, else, provided by the config
997 if (!cfg.readOnly && initValues && initValues.hasOwnProperty(attr)) {
998 val = initValues[attr];
1001 valFn = cfg.valueFn;
1005 valFn = this[valFn];
1008 val = valFn.call(this, attr);
1013 Y.log('initValue for ' + attr + ':' + val, 'info', 'attribute');
1019 * Utility method to set up initial attributes defined during construction, either through the constructor.ATTRS property, or explicitly passed in.
1021 * @method _initAttrs
1023 * @param attrs {Object} The attributes to add during construction (passed through to <a href="#method_addAttrs">addAttrs</a>). These can also be defined on the constructor being augmented with Attribute by defining the ATTRS property on the constructor.
1024 * @param values {Object} The initial attribute values to apply (passed through to <a href="#method_addAttrs">addAttrs</a>). These are not merged/cloned. The caller is responsible for isolating user provided values if required.
1025 * @param lazy {boolean} Whether or not to add attributes lazily (passed through to <a href="#method_addAttrs">addAttrs</a>).
1027 _initAttrs : function(attrs, values, lazy) {
1028 // ATTRS support for Node, which is not Base based
1029 attrs = attrs || this.constructor.ATTRS;
1032 BaseCore = Y.BaseCore,
1033 baseInst = (Base && Y.instanceOf(this, Base)),
1034 baseCoreInst = (!baseInst && BaseCore && Y.instanceOf(this, BaseCore));
1036 if ( attrs && !baseInst && !baseCoreInst) {
1037 this.addAttrs(this._protectAttrs(attrs), values, lazy);
1042 Y.AttributeCore = AttributeCore;
1045 }, '3.7.2', {"requires": ["oop"]});