primish
v0.3.9
Published
A portable Class implementation in javascript, forked from MooTools Prime
Downloads
99
Readme
primish
A prime derivative that went beyond repair. Initially a fork of MooTools prime, now with a lot of sugar.
Why fork prime in the first place? Although prime is very good, it has been two years in the making and is not officially released yet. It's also written for CommonJS and it needs a fair amount of packaging, bundling of plugins and behaviours in order to make it work in a browser (via browserify
or wrapup
). It also tries to provide its own utilities methods and helpers, something that a lot of people have solved via lodash
or underscore
. It also does not try to keep the MooTools Class API / features. Primish does not only fix the module packaging (UMD!), there are considerable changes in code to make it more Classy and it is bower
-ready and available on cdnjs.com
for immediate use. At little over 4K in size, you get a lot of mileage for your money if you like classic OOP style code in your JavaScript.
Differences
prime changes
- forked from before the new prime types and object mixins.
.parent()
.implement()
andimplement
mutator, like mootools. notmixin
extend
, notinherits
prime.merge()
shallow Object merging- object keys of constructor object are NOT de-referenced / cloned
- only
options
objects are automatically de-referenced like in MooTools, other objects will point to prototype and will be mutable - extras from prime like utils, shell, type, etc have all been removed, recommended util library is
lodash
. - primish classes can have IDs for reflection like in AMD.
emitter changes
.emit
is actually.trigger
, so it's not anemitter
as such :)- no support for defered async events (see this)
- support for event stacking like
.on('foo bar baz', function(){});
- support for event pseudos like
.on('foo:once', function(){});
emitter.definePseudo()
to allow custom pseudo events
options
.setOptions()
- shallow merging of object withthis.options
- support for emitter events via
onEventname
->this.on('eventname')
like in MooTools 1.x
Browser support
The main driving force behind primish is to change prime to work in a browser out of the box as well as under nodejs.
This fork changes the code to work via an UMD wrap w/o any dependencies, so it supports AMD (eg. RequireJS, Almond) as
well as simple browser exports to globals. If you don't have an AMD loader and not under NodeJS / browserify, it will
export window.primish
, window.emitter
and window.options
, so be careful. Another goal has been to bring as much
MooTools 1.x sugar into classes as possible.
### Size and download
The minified packaged version weighs just 4.2K without gzipping, so a tiny footprint in any codebase.
primish-min.js (4.2k)
Changelog
- 0.3.9 safer hasOwnProperty checks
- 0.3.8 performance optimisations for primish/emitter
- 0.3.7 tweaks for bower consumption
- 0.3.6 perf fixes for emitter.trigger, tiny doc changes, jsdoc notation
- 0.3.5 dereferencing
this.options
from protos, export ofprimish.clone
- 0.3.4 fixed AMD module IDs for build to work better with bundles
- 0.3.3 requirejs 2.1.10 compatible bundles support via module ids
- 0.3.2 requirejs uglify2 build
Testimonials
kentaromiura, mootools-core and mootools-prime developer said:
I guess that when you said I'll go and make my own version of prime with, blackjack and hookers you really meant it
Creating a Class
To create a new Class, you simply need to do:
// under AMD
require(['primish/primish'], function(primish){
var Human = primish({
setName: function(name){
this.name = name;
},
getName: function(){
return this.name;
}
});
var Bob = new Human();
Bob.setName('Bob');
console.log(Bob.getName()); // 'Bob'
});
You can also add a constructor method on your config object to run automatically:
require(['primish/primish'], function(primish){
var Human = primish({
constructor: function(name){
name && this.setName(name);
},
setName: function(name){
this.name = name;
},
getName: function(){
return this.name;
}
});
var Bob = new Human('Bob');
console.log(Bob.getName()); // 'Bob'
});
For node / CommonJS:
var primish = require('primish'),
options = require('primish/options');
var Human = primish({
implement: [options],
constructor: function(options){
this.setOptions(options);
}
});
var Bob = new Human({name: 'Bob'});
console.log(Bob.options.name); // 'Bob'
Here is an example that will make the name property readonly
and example private variables
require(['primish/primish'], function(primish){
var Human = (function(){
var storage = {},
hid = 0;
var Human = primish({
constructor: function(name){
this.$hid = hid++;
storage[this.$hid] = {};
// disallow changes to human id
primish.define(this, '$hid', {
writable: false,
enumerable: false
});
primish.define(this, 'name', {
configurable: false,
get: function(){
return this.getName();
}
});
name && this.setName(name);
},
setName: function(name){
storage[this.$hid].name = name;
},
getName: function(){
return storage[this.$hid].name;
}
});
return Human;
}());
var Bob = new Human('Bob'),
Greg = new Human('Greg');
console.log(Bob);
console.log(Bob.getName()); // 'Bob'
console.log(Bob.name); // 'Bob'
Bob.name = 'Robert'; // nope, should not change.
console.log(Bob.name); // 'Bob'
Bob.$uid = Greg.$uid; // try to puncture Greg's storage
console.log(Bob.name); // 'Bob'
});
What happens behind the scenes? prime
accepts a single argument as a config object. The object is a simple JavaScript
Object - with special keys (also referred to mutator keys
).
A mutator key
is a key:value pair that has a special meaning and is used differently by the Class constructor. The
following keys in your config object are considered mutator
:
constructor
The constructor
method in your config object is what becomes the prime constructor. It runs automatically when you
instantiate and can accept any number of arguments, named or otherwise.
require(['primish/primish'], function(primish){
// have an element
var div = document.createElement('div');
div.setAttribute('id', 'myWidget');
document.body.appendChild(div);
var Widget = primish({
options: {
title: 'My Widget'
},
constructor: function(el, options){
this.element = document.getElementById(el);
if (options && Object(options) === options){
this.options = options;
}
this.element.innerHTML = this.options.title;
}
});
var instance = new Widget('myWidget', {
title: 'Cool Widget',
height: 300
});
console.log(instance.options.title); // 'Cool Widget'
console.log(instance.element.innerHTML); // 'Cool Widget'
});
class IDs
Primish also supports Class IDs (for 'reflection') - similar to AMD's module IDs. The first argument can be an optional
string ID, which can then be accessed via instance._id
. When possible, these are added via Object.defineProperty
and
are not enumerable.
require(['primish/primish'], function(primish){
var User = primish('Admin.User', {
constructor: function(){
console.log(this._id);
}
});
var instance = new User();
console.log('It looks like the instance is ' + instance._id);
});
Caveat: if your super Class has an ID but your subclass does not, it will still resolve this via the prototype chain and may incorrectly identify your instance as the parent. Make sure you use IDs recursively if you need them.
extend
The special key extend
defines what SuperClass your new Class will inherit from. It only accepts a single argument,
pointing to another Class. The resulting new Class definition will have its prototype set to the SuperClass and inherit
any of its static properties and methods via the scope chain.
This allows you to abstract differences between Classes without having to repeat a lot of code.
require(['primish/primish'], function(primish){
var Rectangle = primish({
constructor: function(width, height){
return this.setWidth(width).setHeight(height);
},
setWidth: function(width){
this.width = width;
return this; // allow chaining
},
setHeight: function(height){
this.height = height;
return this;
},
squareRoot: function(){
return this.height * this.width;
}
});
var Square = primish({
// subclass of Rectangle
extend: Rectangle,
constructor: function(side){
return this.setSide(side);
},
setSide: function(side){
// both sides are the same
this.width = this.height = side;
return this;
},
setWidth: function(width){
return this.setSide(width);
},
setHeight: function(height){
return this.setSide(height);
}
});
var square = new Square(30);
square.setWidth(5); // local
console.log(square.height); // 5
console.log(square.squareRoot()); // from parent proto of Rectangle, 25
});
Changes to the parent Class are also reflected in the child Class by inheritance (unless the child has a local implementation). This differs from when you use the implement directives, which copies instead.
// continued from above
Rectangle.prototype.shrink = function(){
this.width--;
this.height--;
return this;
};
// square can also now call .shrink:
square.setSide(5).shrink();
square.width; // 4;
square.height; // 4
Warning: when creating a new sub class, if you have an options
object in the constructor and the super class also has it,
it will automatically merge them for you. This is really helpful when using the options mixin:
require(['primish/primish'], function(primish){
var a = primish({
options: {
x: 1,
y: 1
}
});
var b = primish({
extend: a,
options: {
z: 1
}
});
console.log(new b().options); // {x:1, y:1, z:1}
});
implement
The special key implement
is used to tell prime which other Objects' properties are to be copied
into your own Class
definition. Mixins do not work via inheritance, they create a local instance of the properties.
When used as a property, implement
accepts either a single Class or an array of Classes to implement.
require(['primish/primish'], function(primish){
// example using a small event emitter as a mixin
var EID = 0;
var Emitter = primish({
on: function(event, fn){
var listeners = this._listeners || (this._listeners = {}),
events = listeners[event] || (listeners[event] = {});
for (var k in events) if (events[k] === fn) return this;
events[(EID++).toString(36)] = fn;
return this;
},
trigger: function(event){
var listeners = this._listeners, events, k, args;
if (listeners && (events = listeners[event])){
args = (arguments.length > 1) ? slice.call(arguments, 1) : [];
for (k in events) events[k].apply(this, args);
}
return this;
}
});
var myClass = primish({
// implement the emitter:
implement: [Emitter],
doSomethingImportant: function(){
this.trigger('important');
}
});
var instance = new myClass();
// bind some event, .on is available
instance.on('important', function(){
console.log('important is done');
});
// call the method that will fire the event.
instance.doSomethingImportant();
});
There is an alternative syntax to allow late implementation
via the .mixin
method:
myClass.implement(new OtherClass());
// or chaining on an instance
instanceofMyClass.implement(new OtherClass2()).implement(new OtherClass3());
// late binding at proto definition also works
var myClass = primish({}).implement(new OtherClass);
parent
When extending a Class, you can access methods from the super via the .parent()
method. It expects at least
1 argument - the method name as String
. This is synthactic sugar for saying:
this.constructor.prototype.methodname.apply(this, [arguments])
, where methodname is the method passed as string.
The parent method is borrowed from Arian's prime-util repo.
Here is a more comprehensive example:
require(['primish/primish'], function(primish){
// this example won't work w/o jQuery and ECMA5
// assume this.$element is a jquery wrapped el.
var Widget = primish({
attachEvents: function(){
this.$element.on('click', this.handleclick.bind(this));
},
handleClick: function(){
},
setTitle: function(title){
this.$element.find('.title').text(title);
}
});
var WeatherWidget = primish({
extend: Widget,
attachEvents: function(){
this.parent('attachEvents'); // call it on super Widget
// do more.
this.$element.find('input').on('blur', this.validateInput.bind(this));
},
validateInput: function(event){
}
});
// example with shifting arguments
var NewsWidget = primish({
extend: Widget,
setTitle: function(text){
this.$element.find('.sub-heading').addClass('active');
this.parent('setTitle', text); // passes original arg to parent.
}
});
});
Define
Define is a micro polyfill to Object.defineProperty
- see MDN. It works in conjunction with Object.getOwnPropertyDescriptor
, which is also shimmed for older browsers.
This allows you to have read-only properties of objects, or private getters/setters. Example use
require(['primish/primish'], function(primish){
var Human = primish({
constructor: function(name){
this.name = name;
// make name readonly
primish.define(this, 'name', {
writable: false,
enumerable: true
});
},
setName: function(name){
this.name = name; // won't work in modern browsers
}
});
var Bob = new Human('Bob');
Bob.setName('Robert');
Bob.name = 'Rob';
// should be fine.
console.info(Bob.name);
console.assert(Bob.name === 'Bob');
});
Plugins
emitter
The Emitter class can work either as a mixin or as a standalone Class instance. It provides any Class that uses it with 3 methods it can call:
.on(event, callback)
- subscribes toString(event)
and runscallback
when fired..off(event, callback)
- removes specific subscription toString(event)
by exact reference tocallback
. Removing events requires you to be able to pass on the original bound callback..trigger(event, [Optional arguments])
- firesString(event)
and optionally passes arguments to the callback
By default, the scope of this
in any event callback function will be the object that fired it, not the subscriber. If you want to keep scope bound to your local instance, you need to use Function.prototype.bind
(if ES5Shim is being used) or _.bind
(lodash or underscore), which is probably safer.
Using events
require(['primish/primish', 'primish/emitter'], function(primish, emitter){
// this example won't run w/o ECMA5 Function.prototype.bind
var someController = new (primish({
implement: [emitter]
}))();
var Human = primish({
implement: [Emitter],
constructor: function(){
this.attachEvents();
},
eat: function(energy){
this.energy += energy;
// fire an event, passing how much and new energy level
this.trigger('eat', [energy, this.energy]);
},
attachEvents: function(){
// subscribe to another instance's init event
someController.on('init', this.initialize.bind(this));
// example of an event that gets removed after a single run
this.boundFetch = this.dataFetched.bind(this);
someController.on('fetch', this.boundFetch);
},
initialize: function(){
// this will only run after the controller fires init, this = self.
console.log('ready to do stuff');
},
dataFetched: function(){
// should only run once and unsubscribe
// do stuff
console.log('we have data');
// remove the event by passing reference to the saved bound function
this.off('fetch', this.boundFetch);
delete this.boundFetch;
}
});
var Bob = new Human();
someController.trigger('init');
setTimeout(function(){
someController.trigger('fetch');
}, 1000);
});
You can also use named anonymous functions to remove your own event in a hurry:
require(['primish/primish', 'primish/emitter'], function(primish, emitter){
var Human = primish({
implement: [emitter],
constructor: function(){
this.on('hi', function hiEvent(){
console.log('running callback');
this.off('hi', hiEvent);
});
}
});
var h = new Human();
h.trigger('hi').trigger('hi'); // should only console.log once
// or simply use the :once pseudo
h.on('bye:once', function(){
console.log('bye');
});
h.trigger('bye');
h.trigger('bye'); // won't do anything
});
There is also syntactic sugar available for adding more than one event to the same callback:
var cb = function(){
};
model.on('change fetch create', cb); // any of change, fetch or create events fire the same handler
definePseudo
Emitter supports pseudo events
, similar in style to CSS pseudos. For instance: load:once
is a load
event with a once
pseudo.
By default, emitter ships with once
pre-defined - which will run an event callback once only, then unbind itself.
It exposes an API to define custom pseudos on the emitter object.
require(['primish/primish', 'primish/emitter'], function(primish, emitter){
var user = {
role: 'tester'
};
// definePseudo takes 2 arguments - base event name and fn callback
emitter.definePseudo('admin', function(eventName, fn){
// need to return a function
return function(){
// eg, check if user.role is admin
if (user.role === 'admin'){
fn.apply(this, arguments);
}
};
});
var e = new emitter();
e.on('load:once', function(){
console.log('loaded, should see this once');
});
e.on('test:admin', function(){
console.log('this should only run when user.role === "admin"');
});
// once
e.trigger('load');
e.trigger('load');
// at the moment, role is wrong, so this won't fire
e.trigger('test');
user.role = 'admin';
e.trigger('test'); // test:admin cb will now run
});
options
A small utility mixin from Arian's prime-util that allows easy object merge of an Object into this.object
from right to left. If emitter is also mixed-in, it will automatically add events prefixed by on
and camelcased, eg, onReady: function(){}
.
require(['primish/primish', 'primish/emitter', 'primish/options'], function(primish, emitter, options){
var Human = primish({
options: {
name: 'unknown'
},
implement: [options, emitter],
constructor: function(options){
this.setOptions(options);
this.trigger('ready');
}
});
var bob = new Human({
name: 'Bob',
surname: 'Roberts',
onReady: function(){
console.log(this.options.name, this.options.surname);
// this.options.onReady won't be added.
}
});
});
contributing
To install locally, clone the repo and setup:
$ git clone https://github.com/dimitarchristoff/primish.git
$ cd primish/
# pull the deps
$ npm install
# run the tests
$ npm test
# generate docs and make a new build
$ npm install -g grunt-cli
$ grunt
$ cd dist
$ python -m SimpleHTTPServer
$ open http://localhost:8000
# just generate a new build
$ grunt requirejs:build
npm usage
You can install it via npm by simply doing:
$ npm install primish --save
Then to access it in a nodejs script:
var prime = require('primish'),
emitter = require('primish/emitter');
var foo = primish({
implement: emitter
}); // etc.
bower usage
To install it as a bower component, simply do:
$ bower install primish --save
RequireJS usage
Primish is compatible with RequireJS 2.1.10 bundles. Here's an example require config that lets you use the minified primish file and require all sub modules later:
require.config({
bundles: {
'bower_components/primish/primish-min': [
'primish/primish',
'primish/emitter',
'primish/options'
]
}
});
require([
'primish/primish',
'primish/options',
'primish/emitter'
], function(primish, options, emitter){
// should see one HTTP request for primish-min only for either of
// the 3 files requested for the first time.
var Person = primish({
implement: [options, emitter],
constructor: function(options){
this.setOptions(options);
}
});
});
Have fun, examples in ./examples/
and also look at the spec
folder (jasmine-node test runner).
Most examples in the docs are runnable, just edit the code and press run
, then look at your console.
A more complex example can be seen in Epik, a fully fledged MVC framework built on top of primish and lodash.
License
Use as you deem fit under the original MIT license for prime. Primish brings little on top of the work of the MooTools team. The documentation and examples are not covered by the license and may need to be changed.