Experiment: Angular-Like Simple Dependency Injection

container.js

function Container(opt){
	this.services = []; 
	if(opt)
	{
		this.owner = opt.owner || window;
	}
		
}

Container.prototype = {
	register: function(name, args){
		if(Object.prototype.toString.call(args) == '[object Array]')
			this.registerByArray(name, args);
		else
			this.registerByInfer(name, args);
	},
	registerByArray: function(name, args){
		var registration = {
			name: name,
			func: args[args.length-1],
			dependencies: args.splice(0,args.length-1)
		};
		this.services.push(registration);
	},
	registerByInfer: function(name, func){
		var strFunc = func.toString();
		var params =strFunc.substring(strFunc.indexOf('(')+1, strFunc.indexOf(')')).split(',');
		var dependencies = [];
		for(var i=0; i<params.length; i++){
			var param = params[i].trim();
			if(param == '')
				continue;	
			dependencies.push(param);
		}
		this.services.push({
			name: name,
			func: func,
			dependencies: dependencies
		});
	},
	_getServiceByName: function(name){
		var services = this.services;
		for(var i=0; i<services.length; i++){
			if(services[i].name == name)
				return services[i];
		}
		return null;
	},
	resolve: function(name){
		var registration = this._getServiceByName(name);
		
		var deps = [];
		
		for(var i=0; i<registration.dependencies.length; i++){
			//this is not the best way
			deps.push(this.resolve(registration.dependencies[i]));
		}
		
		return registration.func.apply(this.owner, deps);
	}
};

//usage
var container =new Container();
	
container.register('dependency1', function(){
	return function(){
		console.log('my name is dependency 1');
	}
});

container.register('dependency2', ['dependency1', function(dependency1){
	return  {
		doSomething: function(){
			dependency1();
			console.log('do something');
		}
	}
}]);

container.register('testService', function(dependency1, dependency2){
	return function(val){
		dependency1();
		dependency2.doSomething();
		console.log(val);
	};
});
	
container.resolve('testService')(12);