3
Copyright 2012 Yahoo! Inc. All rights reserved.
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Licensed under the BSD License.
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http://yuilibrary.com/license/
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YUI.add('attribute-core', function(Y) {
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* 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
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* of these classes for each item, by storing the state in a 2 level hash table,
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* improving performance when the number of items is likely to be large.
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Y.State = function() {
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* Adds a property to an item.
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* @param name {String} The name of the item.
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* @param key {String} The name of the property.
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* @param val {Any} The value of the property.
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add : function(name, key, val) {
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d[name] = d[name] || {};
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* Adds multiple properties to an item.
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* @param name {String} The name of the item.
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* @param o {Object} A hash of property/value pairs.
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addAll: function(name, o) {
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if (o.hasOwnProperty(key)) {
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this.add(name, key, o[key]);
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* Removes a property from an item.
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* @param name {String} The name of the item.
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* @param key {String} The property to remove.
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remove: function(name, key) {
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* Removes multiple properties from an item, or remove the item completely.
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* @param name {String} The name of the item.
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* @param o {Object|Array} Collection of properties to delete. If not provided, the entire item is removed.
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removeAll: function(name, o) {
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Y.each(o, function(v, k) {
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if(Y.Lang.isString(k)) {
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* For a given item, returns the value of the property requested, or undefined if not found.
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* @param name {String} The name of the item
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* @param key {String} Optional. The property value to retrieve.
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* @return {Any} The value of the supplied property.
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get: function(name, key) {
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return (d[name]) ? d[name][key] : undefined;
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* For the given item, returns an object with all of the
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* item's property/value pairs. By default the object returned
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* is a shallow copy of the stored data, but passing in true
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* as the second parameter will return a reference to the stored
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* @param name {String} The name of the item
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* @param reference {boolean} true, if you want a reference to the stored
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* @return {Object} An object with property/value pairs for the item.
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getAll : function(name, reference) {
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var d = this.data, o;
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Y.each(d[name], function(v, k) {
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* The attribute module provides an augmentable Attribute implementation, which
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* adds configurable attributes and attribute change events to the class being
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* augmented. It also provides a State class, which is used internally by Attribute,
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* but can also be used independently to provide a name/property/value data structure to
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* The attribute-core submodule provides the lightest level of attribute handling support
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* without Attribute change events, or lesser used methods such as reset(), modifyAttrs(),
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* @submodule attribute-core
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// Externally configurable props
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READ_ONLY = "readOnly",
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WRITE_ONCE = "writeOnce",
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INIT_ONLY = "initOnly",
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VALIDATOR = "validator",
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VALUE_FN = "valueFn",
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LAZY_ADD = "lazyAdd",
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// Used for internal state management
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BYPASS_PROXY = "_bypassProxy",
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INITIALIZING = "initializing",
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INIT_VALUE = "initValue",
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IS_LAZY_ADD = "isLazyAdd",
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* AttributeCore provides the lightest level of configurable attribute support. It is designed to be
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* augmented on to a host class, and provides the host with the ability to configure
189
* attributes to store and retrieve state, <strong>but without support for attribute change events</strong>.
191
* <p>For example, attributes added to the host can be configured:</p>
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* <li>As read only.</li>
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* <li>As write once.</li>
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* <li>With a setter function, which can be used to manipulate
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* values passed to Attribute's <a href="#method_set">set</a> method, before they are stored.</li>
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* <li>With a getter function, which can be used to manipulate stored values,
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* before they are returned by Attribute's <a href="#method_get">get</a> method.</li>
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* <li>With a validator function, to validate values before they are stored.</li>
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* <p>See the <a href="#method_addAttr">addAttr</a> method, for the complete set of configuration
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* options available for attributes.</p>
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* <p>Object/Classes based on AttributeCore can augment <a href="AttributeEvents.html">AttributeEvents</a>
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* (with true for overwrite) and <a href="AttributeExtras.html">AttributeExtras</a> to add attribute event and
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* additional, less commonly used attribute methods, such as `modifyAttr`, `removeAttr` and `reset`.</p>
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* @class AttributeCore
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* @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.
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* @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.
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* @param lazy {boolean} Whether or not to add attributes lazily (passed through to <a href="#method_addAttrs">addAttrs</a>).
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function AttributeCore(attrs, values, lazy) {
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this._initAttrHost(attrs, values, lazy);
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* <p>The value to return from an attribute setter in order to prevent the set from going through.</p>
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* <p>You can return this value from your setter if you wish to combine validator and setter
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* functionality into a single setter function, which either returns the massaged value to be stored or
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* AttributeCore.INVALID_VALUE to prevent invalid values from being stored.</p>
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* @property INVALID_VALUE
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AttributeCore.INVALID_VALUE = {};
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INVALID_VALUE = AttributeCore.INVALID_VALUE;
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* The list of properties which can be configured for
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* each attribute (e.g. setter, getter, writeOnce etc.).
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* This property is used internally as a whitelist for faster
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* @property _ATTR_CFG
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AttributeCore._ATTR_CFG = [SETTER, GETTER, VALIDATOR, VALUE, VALUE_FN, WRITE_ONCE, READ_ONLY, LAZY_ADD, BYPASS_PROXY];
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AttributeCore.prototype = {
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* Constructor logic for attributes. Initializes the host state, and sets up the inital attributes passed to the
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* @method _initAttrHost
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* @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.
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* @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.
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* @param lazy {boolean} Whether or not to add attributes lazily (passed through to <a href="#method_addAttrs">addAttrs</a>).
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_initAttrHost : function(attrs, values, lazy) {
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this._state = new Y.State();
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this._initAttrs(attrs, values, lazy);
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* Adds an attribute with the provided configuration to the host object.
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* The config argument object supports the following properties:
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* <dt>value <Any></dt>
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* <dd>The initial value to set on the attribute</dd>
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* <dt>valueFn <Function | String></dt>
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* <p>A function, which will return the initial value to set on the attribute. This is useful
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* for cases where the attribute configuration is defined statically, but needs to
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* reference the host instance ("this") to obtain an initial value. If both the value and valueFn properties are defined,
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* the value returned by the valueFn has precedence over the value property, unless it returns undefined, in which
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* case the value property is used.</p>
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* <p>valueFn can also be set to a string, representing the name of the instance method to be used to retrieve the value.</p>
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* <dt>readOnly <boolean></dt>
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* <dd>Whether or not the attribute is read only. Attributes having readOnly set to true
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* cannot be modified by invoking the set method.</dd>
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* <dt>writeOnce <boolean> or <string></dt>
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* Whether or not the attribute is "write once". Attributes having writeOnce set to true,
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* can only have their values set once, be it through the default configuration,
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* constructor configuration arguments, or by invoking set.
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* <p>The writeOnce attribute can also be set to the string "initOnly", in which case the attribute can only be set during initialization
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* (when used with Base, this means it can only be set during construction)</p>
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* <dt>setter <Function | String></dt>
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* <p>The setter function used to massage or normalize the value passed to the set method for the attribute.
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* The value returned by the setter will be the final stored value. Returning
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* <a href="#property_Attribute.INVALID_VALUE">Attribute.INVALID_VALUE</a>, from the setter will prevent
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* the value from being stored.
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* <p>setter can also be set to a string, representing the name of the instance method to be used as the setter function.</p>
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* <dt>getter <Function | String></dt>
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* The getter function used to massage or normalize the value returned by the get method for the attribute.
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* The value returned by the getter function is the value which will be returned to the user when they
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* <p>getter can also be set to a string, representing the name of the instance method to be used as the getter function.</p>
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* <dt>validator <Function | String></dt>
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* The validator function invoked prior to setting the stored value. Returning
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* false from the validator function will prevent the value from being stored.
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* <p>validator can also be set to a string, representing the name of the instance method to be used as the validator function.</p>
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* <dt>lazyAdd <boolean></dt>
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* <dd>Whether or not to delay initialization of the attribute until the first call to get/set it.
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* This flag can be used to over-ride lazy initialization on a per attribute basis, when adding multiple attributes through
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* the <a href="#method_addAttrs">addAttrs</a> method.</dd>
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* <p>The setter, getter and validator are invoked with the value and name passed in as the first and second arguments, and with
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* the context ("this") set to the host object.</p>
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* <p>Configuration properties outside of the list mentioned above are considered private properties used internally by attribute,
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* and are not intended for public use.</p>
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* @param {String} name The name of the attribute.
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* @param {Object} config An object with attribute configuration property/value pairs, specifying the configuration for the attribute.
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* <strong>NOTE:</strong> The configuration object is modified when adding an attribute, so if you need
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* to protect the original values, you will need to merge the object.
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* @param {boolean} lazy (optional) Whether or not to add this attribute lazily (on the first call to get/set).
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* @return {Object} A reference to the host object.
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addAttr: function(name, config, lazy) {
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var host = this, // help compression
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config = config || {};
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lazy = (LAZY_ADD in config) ? config[LAZY_ADD] : lazy;
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if (lazy && !host.attrAdded(name)) {
381
if (!host.attrAdded(name) || state.get(name, IS_LAZY_ADD)) {
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hasValue = (VALUE in config);
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// We'll go through set, don't want to set value in config directly
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value = config.value;
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config.initializing = true;
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state.addAll(name, config);
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// Go through set, so that raw values get normalized/validated
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host.set(name, value);
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state.remove(name, INITIALIZING);
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* Checks if the given attribute has been added to the host
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* @param {String} name The name of the attribute to check.
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* @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.
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attrAdded: function(name) {
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return !!this._state.get(name, ADDED);
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* Returns the current value of the attribute. If the attribute
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* has been configured with a 'getter' function, this method will delegate
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* to the 'getter' to obtain the value of the attribute.
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* @param {String} name The name of the attribute. If the value of the attribute is an Object,
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* dot notation can be used to obtain the value of a property of the object (e.g. <code>get("x.y.z")</code>)
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* @return {Any} The value of the attribute
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get : function(name) {
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return this._getAttr(name);
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* Checks whether or not the attribute is one which has been
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* added lazily and still requires initialization.
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* @method _isLazyAttr
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* @param {String} name The name of the attribute
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* @return {boolean} true if it's a lazily added attribute, false otherwise.
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_isLazyAttr: function(name) {
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return this._state.get(name, LAZY);
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* Finishes initializing an attribute which has been lazily added.
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* @method _addLazyAttr
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* @param {Object} name The name of the attribute
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_addLazyAttr: function(name, cfg) {
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var state = this._state,
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lazyCfg = state.get(name, LAZY);
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state.add(name, IS_LAZY_ADD, true);
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state.remove(name, LAZY);
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this.addAttr(name, lazyCfg);
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* Sets the value of an attribute.
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* @param {String} name The name of the attribute. If the
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* current value of the attribute is an Object, dot notation can be used
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* to set the value of a property within the object (e.g. <code>set("x.y.z", 5)</code>).
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* @param {Any} value The value to set the attribute to.
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* @return {Object} A reference to the host object.
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set : function(name, val) {
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return this._setAttr(name, val);
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* Allows setting of readOnly/writeOnce attributes. See <a href="#method_set">set</a> for argument details.
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* @param {String} name The name of the attribute.
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* @param {Any} val The value to set the attribute to.
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* @return {Object} A reference to the host object.
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_set : function(name, val) {
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return this._setAttr(name, val, null, true);
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* Provides the common implementation for the public set and protected _set methods.
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* See <a href="#method_set">set</a> for argument details.
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* @param {String} name The name of the attribute.
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* @param {Any} value The value to set the attribute to.
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* @param {Object} opts (Optional) Optional event data to be mixed into
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* the event facade passed to subscribers of the attribute's change event.
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* This is currently a hack. There's no real need for the AttributeCore implementation
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* to support this parameter, but breaking it out into AttributeEvents, results in
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* additional function hops for the critical path. May change in 3.5.0 PR3.
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* @param {boolean} force If true, allows the caller to set values for
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* readOnly or writeOnce attributes which have already been set.
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* @return {Object} A reference to the host object.
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_setAttr : function(name, val, opts, force) {
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// HACK - no real reason core needs to know about opts, but
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// it adds fn hops if we want to break it out.
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// Not sure it's worth it for this critical path
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stateProxy = this._stateProxy,
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if (name.indexOf(DOT) !== -1) {
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path = name.split(DOT);
542
if (this._isLazyAttr(name)) {
543
this._addLazyAttr(name);
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cfg = state.getAll(name, true) || {};
548
initialSet = (!(VALUE in cfg));
550
if (stateProxy && name in stateProxy && !cfg._bypassProxy) {
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// 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?
555
writeOnce = cfg.writeOnce;
556
initializing = cfg.initializing;
558
if (!initialSet && !force) {
569
if (!initializing && !force && writeOnce === INIT_ONLY) {
574
// Don't need currVal if initialSet (might fail in custom getter if it always expects a non-undefined/non-null value)
576
currVal = this.get(name);
580
val = O.setValue(Y.clone(currVal), path, val);
582
if (val === undefined) {
588
if (!this._fireAttrChange || initializing) {
589
this._setAttrVal(name, strPath, currVal, val);
591
// HACK - no real reason core needs to know about _fireAttrChange, but
592
// it adds fn hops if we want to break it out. Not sure it's worth it for this critical path
593
this._fireAttrChange(name, strPath, currVal, val, opts);
602
* Provides the common implementation for the public get method,
603
* allowing Attribute hosts to over-ride either method.
605
* See <a href="#method_get">get</a> for argument details.
611
* @param {String} name The name of the attribute.
612
* @return {Any} The value of the attribute.
614
_getAttr : function(name) {
615
var host = this, // help compression
623
if (name.indexOf(DOT) !== -1) {
624
path = name.split(DOT);
628
// On Demand - Should be rare - handles out of order valueFn references
629
if (host._tCfgs && host._tCfgs[name]) {
631
cfg[name] = host._tCfgs[name];
632
delete host._tCfgs[name];
633
host._addAttrs(cfg, host._tVals);
637
if (host._isLazyAttr(name)) {
638
host._addLazyAttr(name);
641
val = host._getStateVal(name);
643
getter = state.get(name, GETTER);
645
if (getter && !getter.call) {
646
getter = this[getter];
649
val = (getter) ? getter.call(host, val, fullName) : val;
650
val = (path) ? O.getValue(val, path) : val;
656
* Gets the stored value for the attribute, from either the
657
* internal state object, or the state proxy if it exits
659
* @method _getStateVal
661
* @param {String} name The name of the attribute
662
* @return {Any} The stored value of the attribute
664
_getStateVal : function(name) {
665
var stateProxy = this._stateProxy;
666
return stateProxy && (name in stateProxy) && !this._state.get(name, BYPASS_PROXY) ? stateProxy[name] : this._state.get(name, VALUE);
670
* Sets the stored value for the attribute, in either the
671
* internal state object, or the state proxy if it exits
673
* @method _setStateVal
675
* @param {String} name The name of the attribute
676
* @param {Any} value The value of the attribute
678
_setStateVal : function(name, value) {
679
var stateProxy = this._stateProxy;
680
if (stateProxy && (name in stateProxy) && !this._state.get(name, BYPASS_PROXY)) {
681
stateProxy[name] = value;
683
this._state.add(name, VALUE, value);
688
* Updates the stored value of the attribute in the privately held State object,
689
* if validation and setter passes.
691
* @method _setAttrVal
693
* @param {String} attrName The attribute name.
694
* @param {String} subAttrName The sub-attribute name, if setting a sub-attribute property ("x.y.z").
695
* @param {Any} prevVal The currently stored value of the attribute.
696
* @param {Any} newVal The value which is going to be stored.
698
* @return {booolean} true if the new attribute value was stored, false if not.
700
_setAttrVal : function(attrName, subAttrName, prevVal, newVal) {
704
cfg = this._state.getAll(attrName, true) || {},
705
validator = cfg.validator,
707
initializing = cfg.initializing,
708
prevRawVal = this._getStateVal(attrName),
709
name = subAttrName || attrName,
714
if (!validator.call) {
715
// Assume string - trying to keep critical path tight, so avoiding Lang check
716
validator = this[validator];
719
valid = validator.call(host, newVal, name);
721
if (!valid && initializing) {
722
newVal = cfg.defaultValue;
723
valid = true; // Assume it's valid, for perf.
728
if (!validator || valid) {
731
// Assume string - trying to keep critical path tight, so avoiding Lang check
732
setter = this[setter];
735
retVal = setter.call(host, newVal, name);
737
if (retVal === INVALID_VALUE) {
739
} else if (retVal !== undefined){
746
if(!subAttrName && (newVal === prevRawVal) && !Lang.isObject(newVal)) {
750
if (!(INIT_VALUE in cfg)) {
751
cfg.initValue = newVal;
753
host._setStateVal(attrName, newVal);
765
* Sets multiple attribute values.
768
* @param {Object} attrs An object with attributes name/value pairs.
769
* @return {Object} A reference to the host object.
772
setAttrs : function(attrs) {
773
return this._setAttrs(attrs);
777
* Implementation behind the public setAttrs method, to set multiple attribute values.
781
* @param {Object} attrs An object with attributes name/value pairs.
782
* @return {Object} A reference to the host object.
785
_setAttrs : function(attrs) {
786
for (var attr in attrs) {
787
if ( attrs.hasOwnProperty(attr) ) {
788
this.set(attr, attrs[attr]);
795
* Gets multiple attribute values.
798
* @param {Array | boolean} attrs Optional. An array of attribute names. If omitted, all attribute values are
799
* returned. If set to true, all attributes modified from their initial values are returned.
800
* @return {Object} An object with attribute name/value pairs.
802
getAttrs : function(attrs) {
803
return this._getAttrs(attrs);
807
* Implementation behind the public getAttrs method, to get multiple attribute values.
811
* @param {Array | boolean} attrs Optional. An array of attribute names. If omitted, all attribute values are
812
* returned. If set to true, all attributes modified from their initial values are returned.
813
* @return {Object} An object with attribute name/value pairs.
815
_getAttrs : function(attrs) {
819
modifiedOnly = (attrs === true);
821
// TODO - figure out how to get all "added"
822
attrs = (attrs && !modifiedOnly) ? attrs : O.keys(host._state.data);
824
for (i = 0, l = attrs.length; i < l; i++) {
825
// Go through get, to honor cloning/normalization
827
val = host.get(attr);
829
if (!modifiedOnly || host._getStateVal(attr) != host._state.get(attr, INIT_VALUE)) {
830
o[attr] = host.get(attr);
838
* Configures a group of attributes, and sets initial values.
841
* <strong>NOTE:</strong> This method does not isolate the configuration object by merging/cloning.
842
* The caller is responsible for merging/cloning the configuration object if required.
848
* @param {Object} cfgs An object with attribute name/configuration pairs.
849
* @param {Object} values An object with attribute name/value pairs, defining the initial values to apply.
850
* Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.
851
* @param {boolean} lazy Whether or not to delay the intialization of these attributes until the first call to get/set.
852
* Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration.
853
* See <a href="#method_addAttr">addAttr</a>.
855
* @return {Object} A reference to the host object.
857
addAttrs : function(cfgs, values, lazy) {
858
var host = this; // help compression
861
host._tVals = host._normAttrVals(values);
862
host._addAttrs(cfgs, host._tVals, lazy);
863
host._tCfgs = host._tVals = null;
870
* Implementation behind the public addAttrs method.
872
* This method is invoked directly by get if it encounters a scenario
873
* in which an attribute's valueFn attempts to obtain the
874
* value an attribute in the same group of attributes, which has not yet
875
* been added (on demand initialization).
879
* @param {Object} cfgs An object with attribute name/configuration pairs.
880
* @param {Object} values An object with attribute name/value pairs, defining the initial values to apply.
881
* Values defined in the cfgs argument will be over-written by values in this argument unless defined as read only.
882
* @param {boolean} lazy Whether or not to delay the intialization of these attributes until the first call to get/set.
883
* Individual attributes can over-ride this behavior by defining a lazyAdd configuration property in their configuration.
884
* See <a href="#method_addAttr">addAttr</a>.
886
_addAttrs : function(cfgs, values, lazy) {
887
var host = this, // help compression
893
if (cfgs.hasOwnProperty(attr)) {
895
// Not Merging. Caller is responsible for isolating configs
896
attrCfg = cfgs[attr];
897
attrCfg.defaultValue = attrCfg.value;
899
// Handle simple, complex and user values, accounting for read-only
900
value = host._getAttrInitVal(attr, attrCfg, host._tVals);
902
if (value !== undefined) {
903
attrCfg.value = value;
906
if (host._tCfgs[attr]) {
907
delete host._tCfgs[attr];
910
host.addAttr(attr, attrCfg, lazy);
916
* Utility method to protect an attribute configuration
917
* hash, by merging the entire object and the individual
918
* attr config objects.
920
* @method _protectAttrs
922
* @param {Object} attrs A hash of attribute to configuration object pairs.
923
* @return {Object} A protected version of the attrs argument.
925
_protectAttrs : function(attrs) {
927
attrs = Y.merge(attrs);
928
for (var attr in attrs) {
929
if (attrs.hasOwnProperty(attr)) {
930
attrs[attr] = Y.merge(attrs[attr]);
938
* Utility method to normalize attribute values. The base implementation
939
* simply merges the hash to protect the original.
941
* @method _normAttrVals
942
* @param {Object} valueHash An object with attribute name/value pairs
948
_normAttrVals : function(valueHash) {
949
return (valueHash) ? Y.merge(valueHash) : null;
953
* Returns the initial value of the given attribute from
954
* either the default configuration provided, or the
955
* over-ridden value if it exists in the set of initValues
956
* provided and the attribute is not read-only.
958
* @param {String} attr The name of the attribute
959
* @param {Object} cfg The attribute configuration object
960
* @param {Object} initValues The object with simple and complex attribute name/value pairs returned from _normAttrVals
962
* @return {Any} The initial value of the attribute.
964
* @method _getAttrInitVal
967
_getAttrInitVal : function(attr, cfg, initValues) {
969
// init value is provided by the user if it exists, else, provided by the config
970
if (!cfg.readOnly && initValues && initValues.hasOwnProperty(attr)) {
971
val = initValues[attr];
981
val = valFn.call(this, attr);
991
* Utility method to set up initial attributes defined during construction, either through the constructor.ATTRS property, or explicitly passed in.
995
* @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.
996
* @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.
997
* @param lazy {boolean} Whether or not to add attributes lazily (passed through to <a href="#method_addAttrs">addAttrs</a>).
999
_initAttrs : function(attrs, values, lazy) {
1000
// ATTRS support for Node, which is not Base based
1001
attrs = attrs || this.constructor.ATTRS;
1004
BaseCore = Y.BaseCore,
1005
baseInst = (Base && Y.instanceOf(this, Base)),
1006
baseCoreInst = (!baseInst && BaseCore && Y.instanceOf(this, BaseCore));
1008
if ( attrs && !baseInst && !baseCoreInst) {
1009
this.addAttrs(this._protectAttrs(attrs), values, lazy);
1014
Y.AttributeCore = AttributeCore;