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//jQuery.Class
// This is a modified version of John Resig's class
// http://ejohn.org/blog/simple-javascript-inheritance/
// It provides class level inheritance and callbacks.
//!steal-clean
steal("jquery","jquery/lang/string",function( $ ) {
// =============== HELPERS =================
// if we are initializing a new class
var initializing = false,
makeArray = $.makeArray,
isFunction = $.isFunction,
isArray = $.isArray,
extend = $.extend,
getObject = $.String.getObject,
concatArgs = function(arr, args){
return arr.concat(makeArray(args));
},
// tests if we can get super in .toString()
fnTest = /xyz/.test(function() {
xyz;
}) ? /\b_super\b/ : /.*/,
// overwrites an object with methods, sets up _super
// newProps - new properties
// oldProps - where the old properties might be
// addTo - what we are adding to
inheritProps = function( newProps, oldProps, addTo ) {
addTo = addTo || newProps
for ( var name in newProps ) {
// Check if we're overwriting an existing function
addTo[name] = isFunction(newProps[name]) &&
isFunction(oldProps[name]) &&
fnTest.test(newProps[name]) ? (function( name, fn ) {
return function() {
var tmp = this._super,
ret;
// Add a new ._super() method that is the same method
// but on the super-class
this._super = oldProps[name];
// The method only need to be bound temporarily, so we
// remove it when we're done executing
ret = fn.apply(this, arguments);
this._super = tmp;
return ret;
};
})(name, newProps[name]) : newProps[name];
}
},
STR_PROTOTYPE = 'prototype'
/**
* @class jQuery.Class
* @plugin jquery/class
* @parent jquerymx
* @download dist/jquery/jquery.class.js
* @test jquery/class/qunit.html
* @description Easy inheritance in JavaScript.
*
* Class provides simulated inheritance in JavaScript. Use clss to bridge the gap between
* jQuery's functional programming style and Object Oriented Programming. It
* is based off John Resig's [http://ejohn.org/blog/simple-javascript-inheritance/|Simple Class]
* Inheritance library. Besides prototypal inheritance, it includes a few important features:
*
* - Static inheritance
* - Introspection
* - Namespaces
* - Setup and initialization methods
* - Easy callback function creation
*
*
* The [mvc.class Get Started with jQueryMX] has a good walkthrough of $.Class.
*
* ## Static v. Prototype
*
* Before learning about Class, it's important to
* understand the difference between
* a class's __static__ and __prototype__ properties.
*
* //STATIC
* MyClass.staticProperty //shared property
*
* //PROTOTYPE
* myclass = new MyClass()
* myclass.prototypeMethod() //instance method
*
* A static (or class) property is on the Class constructor
* function itself
* and can be thought of being shared by all instances of the
* Class. Prototype propertes are available only on instances of the Class.
*
* ## A Basic Class
*
* The following creates a Monster class with a
* name (for introspection), static, and prototype members.
* Every time a monster instance is created, the static
* count is incremented.
*
* @codestart
* $.Class('Monster',
* /* @static *|
* {
* count: 0
* },
* /* @prototype *|
* {
* init: function( name ) {
*
* // saves name on the monster instance
* this.name = name;
*
* // sets the health
* this.health = 10;
*
* // increments count
* this.constructor.count++;
* },
* eat: function( smallChildren ){
* this.health += smallChildren;
* },
* fight: function() {
* this.health -= 2;
* }
* });
*
* hydra = new Monster('hydra');
*
* dragon = new Monster('dragon');
*
* hydra.name // -> hydra
* Monster.count // -> 2
* Monster.shortName // -> 'Monster'
*
* hydra.eat(2); // health = 12
*
* dragon.fight(); // health = 8
*
* @codeend
*
*
* Notice that the prototype <b>init</b> function is called when a new instance of Monster is created.
*
*
* ## Inheritance
*
* When a class is extended, all static and prototype properties are available on the new class.
* If you overwrite a function, you can call the base class's function by calling
* <code>this._super</code>. Lets create a SeaMonster class. SeaMonsters are less
* efficient at eating small children, but more powerful fighters.
*
*
* Monster("SeaMonster",{
* eat: function( smallChildren ) {
* this._super(smallChildren / 2);
* },
* fight: function() {
* this.health -= 1;
* }
* });
*
* lockNess = new SeaMonster('Lock Ness');
* lockNess.eat(4); //health = 12
* lockNess.fight(); //health = 11
*
* ### Static property inheritance
*
* You can also inherit static properties in the same way:
*
* $.Class("First",
* {
* staticMethod: function() { return 1;}
* },{})
*
* First("Second",{
* staticMethod: function() { return this._super()+1;}
* },{})
*
* Second.staticMethod() // -> 2
*
* ## Namespaces
*
* Namespaces are a good idea! We encourage you to namespace all of your code.
* It makes it possible to drop your code into another app without problems.
* Making a namespaced class is easy:
*
*
* $.Class("MyNamespace.MyClass",{},{});
*
* new MyNamespace.MyClass()
*
*
* <h2 id='introspection'>Introspection</h2>
*
* Often, it's nice to create classes whose name helps determine functionality. Ruby on
* Rails's [http://api.rubyonrails.org/classes/ActiveRecord/Base.html|ActiveRecord] ORM class
* is a great example of this. Unfortunately, JavaScript doesn't have a way of determining
* an object's name, so the developer must provide a name. Class fixes this by taking a String name for the class.
*
* $.Class("MyOrg.MyClass",{},{})
* MyOrg.MyClass.shortName //-> 'MyClass'
* MyOrg.MyClass.fullName //-> 'MyOrg.MyClass'
*
* The fullName (with namespaces) and the shortName (without namespaces) are added to the Class's
* static properties.
*
*
* ## Setup and initialization methods
*
* <p>
* Class provides static and prototype initialization functions.
* These come in two flavors - setup and init.
* Setup is called before init and
* can be used to 'normalize' init's arguments.
* </p>
* <div class='whisper'>PRO TIP: Typically, you don't need setup methods in your classes. Use Init instead.
* Reserve setup methods for when you need to do complex pre-processing of your class before init is called.
*
* </div>
* @codestart
* $.Class("MyClass",
* {
* setup: function() {} //static setup
* init: function() {} //static constructor
* },
* {
* setup: function() {} //prototype setup
* init: function() {} //prototype constructor
* })
* @codeend
*
* ### Setup
*
* Setup functions are called before init functions. Static setup functions are passed
* the base class followed by arguments passed to the extend function.
* Prototype static functions are passed the Class constructor
* function arguments.
*
* If a setup function returns an array, that array will be used as the arguments
* for the following init method. This provides setup functions the ability to normalize
* arguments passed to the init constructors. They are also excellent places
* to put setup code you want to almost always run.
*
*
* The following is similar to how [jQuery.Controller.prototype.setup]
* makes sure init is always called with a jQuery element and merged options
* even if it is passed a raw
* HTMLElement and no second parameter.
*
* $.Class("jQuery.Controller",{
* ...
* },{
* setup: function( el, options ) {
* ...
* return [$(el),
* $.extend(true,
* this.Class.defaults,
* options || {} ) ]
* }
* })
*
* Typically, you won't need to make or overwrite setup functions.
*
* ### Init
*
* Init functions are called after setup functions.
* Typically, they receive the same arguments
* as their preceding setup function. The Foo class's <code>init</code> method
* gets called in the following example:
*
* $.Class("Foo", {
* init: function( arg1, arg2, arg3 ) {
* this.sum = arg1+arg2+arg3;
* }
* })
* var foo = new Foo(1,2,3);
* foo.sum //-> 6
*
* ## Proxies
*
* Similar to jQuery's proxy method, Class provides a
* [jQuery.Class.static.proxy proxy]
* function that returns a callback to a method that will always
* have
* <code>this</code> set to the class or instance of the class.
*
*
* The following example uses this.proxy to make sure
* <code>this.name</code> is available in <code>show</code>.
*
* $.Class("Todo",{
* init: function( name ) {
* this.name = name
* },
* get: function() {
* $.get("/stuff",this.proxy('show'))
* },
* show: function( txt ) {
* alert(this.name+txt)
* }
* })
* new Todo("Trash").get()
*
* Callback is available as a static and prototype method.
*
* ## Demo
*
* @demo jquery/class/class.html
*
*
* @constructor
*
* To create a Class call:
*
* $.Class( [NAME , STATIC,] PROTOTYPE ) -> Class
*
* <div class='params'>
* <div class='param'><label>NAME</label><code>{optional:String}</code>
* <p>If provided, this sets the shortName and fullName of the
* class and adds it and any necessary namespaces to the
* window object.</p>
* </div>
* <div class='param'><label>STATIC</label><code>{optional:Object}</code>
* <p>If provided, this creates static properties and methods
* on the class.</p>
* </div>
* <div class='param'><label>PROTOTYPE</label><code>{Object}</code>
* <p>Creates prototype methods on the class.</p>
* </div>
* </div>
*
* When a Class is created, the static [jQuery.Class.static.setup setup]
* and [jQuery.Class.static.init init] methods are called.
*
* To create an instance of a Class, call:
*
* new Class([args ... ]) -> instance
*
* The created instance will have all the
* prototype properties and methods defined by the PROTOTYPE object.
*
* When an instance is created, the prototype [jQuery.Class.prototype.setup setup]
* and [jQuery.Class.prototype.init init] methods
* are called.
*/
clss = $.Class = function() {
if (arguments.length) {
clss.extend.apply(clss, arguments);
}
};
/* @Static*/
extend(clss, {
/**
* @function proxy
* Returns a callback function for a function on this Class.
* Proxy ensures that 'this' is set appropriately.
* @codestart
* $.Class("MyClass",{
* getData: function() {
* this.showing = null;
* $.get("data.json",this.proxy('gotData'),'json')
* },
* gotData: function( data ) {
* this.showing = data;
* }
* },{});
* MyClass.showData();
* @codeend
* <h2>Currying Arguments</h2>
* Additional arguments to proxy will fill in arguments on the returning function.
* @codestart
* $.Class("MyClass",{
* getData: function( <b>callback</b> ) {
* $.get("data.json",this.proxy('process',<b>callback</b>),'json');
* },
* process: function( <b>callback</b>, jsonData ) { //callback is added as first argument
* jsonData.processed = true;
* callback(jsonData);
* }
* },{});
* MyClass.getData(showDataFunc)
* @codeend
* <h2>Nesting Functions</h2>
* Proxy can take an array of functions to call as
* the first argument. When the returned callback function
* is called each function in the array is passed the return value of the prior function. This is often used
* to eliminate currying initial arguments.
* @codestart
* $.Class("MyClass",{
* getData: function( callback ) {
* //calls process, then callback with value from process
* $.get("data.json",this.proxy(['process2',callback]),'json')
* },
* process2: function( type,jsonData ) {
* jsonData.processed = true;
* return [jsonData];
* }
* },{});
* MyClass.getData(showDataFunc);
* @codeend
* @param {String|Array} fname If a string, it represents the function to be called.
* If it is an array, it will call each function in order and pass the return value of the prior function to the
* next function.
* @return {Function} the callback function.
*/
proxy: function( funcs ) {
//args that should be curried
var args = makeArray(arguments),
self;
// get the functions to callback
funcs = args.shift();
// if there is only one function, make funcs into an array
if (!isArray(funcs) ) {
funcs = [funcs];
}
// keep a reference to us in self
self = this;
//!steal-remove-start
for( var i =0; i< funcs.length;i++ ) {
if(typeof funcs[i] == "string" && !isFunction(this[funcs[i]])){
throw ("class.js "+( this.fullName || this.Class.fullName)+" does not have a "+funcs[i]+"method!");
}
}
//!steal-remove-end
return function class_cb() {
// add the arguments after the curried args
var cur = concatArgs(args, arguments),
isString,
length = funcs.length,
f = 0,
func;
// go through each function to call back
for (; f < length; f++ ) {
func = funcs[f];
if (!func ) {
continue;
}
// set called with the name of the function on self (this is how this.view works)
isString = typeof func == "string";
if ( isString && self._set_called ) {
self.called = func;
}
// call the function
cur = (isString ? self[func] : func).apply(self, cur || []);
// pass the result to the next function (if there is a next function)
if ( f < length - 1 ) {
cur = !isArray(cur) || cur._use_call ? [cur] : cur
}
}
return cur;
}
},
/**
* @function newInstance
* Creates a new instance of the class. This method is useful for creating new instances
* with arbitrary parameters.
* <h3>Example</h3>
* @codestart
* $.Class("MyClass",{},{})
* var mc = MyClass.newInstance.apply(null, new Array(parseInt(Math.random()*10,10))
* @codeend
* @return {class} instance of the class
*/
newInstance: function() {
// get a raw instance objet (init is not called)
var inst = this.rawInstance(),
args;
// call setup if there is a setup
if ( inst.setup ) {
args = inst.setup.apply(inst, arguments);
}
// call init if there is an init, if setup returned args, use those as the arguments
if ( inst.init ) {
inst.init.apply(inst, isArray(args) ? args : arguments);
}
return inst;
},
/**
* Setup gets called on the inherting class with the base class followed by the
* inheriting class's raw properties.
*
* Setup will deeply extend a static defaults property on the base class with
* properties on the base class. For example:
*
* $.Class("MyBase",{
* defaults : {
* foo: 'bar'
* }
* },{})
*
* MyBase("Inheriting",{
* defaults : {
* newProp : 'newVal'
* }
* },{}
*
* Inheriting.defaults -> {foo: 'bar', 'newProp': 'newVal'}
*
* @param {Object} baseClass the base class that is being inherited from
* @param {String} fullName the name of the new class
* @param {Object} staticProps the static properties of the new class
* @param {Object} protoProps the prototype properties of the new class
*/
setup: function( baseClass, fullName ) {
// set defaults as the merger of the parent defaults and this object's defaults
this.defaults = extend(true, {}, baseClass.defaults, this.defaults);
return arguments;
},
rawInstance: function() {
// prevent running init
initializing = true;
var inst = new this();
initializing = false;
// allow running init
return inst;
},
/**
* Extends a class with new static and prototype functions. There are a variety of ways
* to use extend:
*
* // with className, static and prototype functions
* $.Class('Task',{ STATIC },{ PROTOTYPE })
* // with just classname and prototype functions
* $.Class('Task',{ PROTOTYPE })
* // with just a className
* $.Class('Task')
*
* You no longer have to use <code>.extend</code>. Instead, you can pass those options directly to
* $.Class (and any inheriting classes):
*
* // with className, static and prototype functions
* $.Class('Task',{ STATIC },{ PROTOTYPE })
* // with just classname and prototype functions
* $.Class('Task',{ PROTOTYPE })
* // with just a className
* $.Class('Task')
*
* @param {String} [fullName] the classes name (used for classes w/ introspection)
* @param {Object} [klass] the new classes static/class functions
* @param {Object} [proto] the new classes prototype functions
*
* @return {jQuery.Class} returns the new class
*/
extend: function( fullName, klass, proto ) {
// figure out what was passed and normalize it
if ( typeof fullName != 'string' ) {
proto = klass;
klass = fullName;
fullName = null;
}
if (!proto ) {
proto = klass;
klass = null;
}
proto = proto || {};
var _super_class = this,
_super = this[STR_PROTOTYPE],
name, shortName, namespace, prototype;
// Instantiate a base class (but only create the instance,
// don't run the init constructor)
initializing = true;
prototype = new this();
initializing = false;
// Copy the properties over onto the new prototype
inheritProps(proto, _super, prototype);
// The dummy class constructor
function Class() {
// All construction is actually done in the init method
if ( initializing ) return;
// we are being called w/o new, we are extending
if ( this.constructor !== Class && arguments.length ) {
return arguments.callee.extend.apply(arguments.callee, arguments)
} else { //we are being called w/ new
return this.Class.newInstance.apply(this.Class, arguments)
}
}
// Copy old stuff onto class
for ( name in this ) {
if ( this.hasOwnProperty(name) ) {
Class[name] = this[name];
}
}
// copy new static props on class
inheritProps(klass, this, Class);
// do namespace stuff
if ( fullName ) {
var parts = fullName.split(/\./),
shortName = parts.pop(),
current = getObject(parts.join('.'), window, true),
namespace = current;
//!steal-remove-start
if (!Class.nameOk ) {
//steal.dev.isHappyName(fullName)
}
if(current[shortName]){
steal.dev.warn("class.js There's already something called "+fullName)
}
//!steal-remove-end
current[shortName] = Class;
}
// set things that can't be overwritten
extend(Class, {
prototype: prototype,
/**
* @attribute namespace
* The namespaces object
*
* $.Class("MyOrg.MyClass",{},{})
* MyOrg.MyClass.namespace //-> MyOrg
*
*/
namespace: namespace,
/**
* @attribute shortName
* The name of the class without its namespace, provided for introspection purposes.
*
* $.Class("MyOrg.MyClass",{},{})
* MyOrg.MyClass.shortName //-> 'MyClass'
* MyOrg.MyClass.fullName //-> 'MyOrg.MyClass'
*
*/
shortName: shortName,
constructor: Class,
/**
* @attribute fullName
* The full name of the class, including namespace, provided for introspection purposes.
*
* $.Class("MyOrg.MyClass",{},{})
* MyOrg.MyClass.shortName //-> 'MyClass'
* MyOrg.MyClass.fullName //-> 'MyOrg.MyClass'
*
*/
fullName: fullName
});
//make sure our prototype looks nice
Class[STR_PROTOTYPE].Class = Class[STR_PROTOTYPE].constructor = Class;
// call the class setup
var args = Class.setup.apply(Class, concatArgs([_super_class],arguments));
// call the class init
if ( Class.init ) {
Class.init.apply(Class, args || concatArgs([_super_class],arguments));
}
/* @Prototype*/
return Class;
/**
* @function setup
* If a setup method is provided, it is called when a new
* instances is created. It gets passed the same arguments that
* were given to the Class constructor function (<code> new Class( arguments ... )</code>).
*
* $.Class("MyClass",
* {
* setup: function( val ) {
* this.val = val;
* }
* })
* var mc = new MyClass("Check Check")
* mc.val //-> 'Check Check'
*
* Setup is called before [jQuery.Class.prototype.init init]. If setup
* return an array, those arguments will be used for init.
*
* $.Class("jQuery.Controller",{
* setup : function(htmlElement, rawOptions){
* return [$(htmlElement),
* $.extend({}, this.Class.defaults, rawOptions )]
* }
* })
*
* <div class='whisper'>PRO TIP:
* Setup functions are used to normalize constructor arguments and provide a place for
* setup code that extending classes don't have to remember to call _super to
* run.
* </div>
*
* Setup is not defined on $.Class itself, so calling super in inherting classes
* will break. Don't do the following:
*
* $.Class("Thing",{
* setup : function(){
* this._super(); // breaks!
* }
* })
*
* @return {Array|undefined} If an array is return, [jQuery.Class.prototype.init] is
* called with those arguments; otherwise, the original arguments are used.
*/
//break up
/**
* @function init
* If an <code>init</code> method is provided, it gets called when a new instance
* is created. Init gets called after [jQuery.Class.prototype.setup setup], typically with the
* same arguments passed to the Class
* constructor: (<code> new Class( arguments ... )</code>).
*
* $.Class("MyClass",
* {
* init: function( val ) {
* this.val = val;
* }
* })
* var mc = new MyClass(1)
* mc.val //-> 1
*
* [jQuery.Class.prototype.setup Setup] is able to modify the arguments passed to init. Read
* about it there.
*
*/
//Breaks up code
/**
* @attribute constructor
*
* A reference to the Class (or constructor function). This allows you to access
* a class's static properties from an instance.
*
* ### Quick Example
*
* // a class with a static property
* $.Class("MyClass", {staticProperty : true}, {});
*
* // a new instance of myClass
* var mc1 = new MyClass();
*
* // read the static property from the instance:
* mc1.constructor.staticProperty //-> true
*
* Getting static properties with the constructor property, like
* [jQuery.Class.static.fullName fullName], is very common.
*
*/
}
})
clss.callback = clss[STR_PROTOTYPE].callback = clss[STR_PROTOTYPE].
/**
* @function proxy
* Returns a method that sets 'this' to the current instance. This does the same thing as
* and is described better in [jQuery.Class.static.proxy].
* The only difference is this proxy works
* on a instance instead of a class.
* @param {String|Array} fname If a string, it represents the function to be called.
* If it is an array, it will call each function in order and pass the return value of the prior function to the
* next function.
* @return {Function} the callback function
*/
proxy = clss.proxy;
})();