hub

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#Hub ####Description: a simple library containing static helpers

####Helpers

###### ClientSideOnly:
JStripe: provides a object that maps a dart object to JsObject and add functions that bind to values or
functions of that JsObject or its inner values

##### Both
State: provides an object that has a set level of functions that run when activate
StateManager: provides a higher level object that uses state objects as a means of manager state
Switch: a basic object with a on or off state,allowing to do a truthy or falsy checker
Distributor: a basic list that accepts functions and then propagates a value to all when its emit method is called
Transformable: takes a function and passes all values to that function for mutation
SymbolCache: a simple factory of symbols which caches them on creation for reuse
MapDecorator: a decorates a map with get,update,destroy calls
SingleLibraryManager: allows grabbing a library definition from the current MirrorSystem
Counter: a simple class that provides a increment,decrement function calls
SparceList: provides a means of adding items into an array at any position,underneath it uses a map,which turns into an array when calling its toList method
Mutator: a simple object that takes a set of functions,
	 where each results from the previous mutates the value used to call the next one.
Injector: provides a base class for activation of a routine depending on the truthy or falsy value of
	a condition function, eg 
	ListInjector: takes items into array and when the condition set is matched,ejects those values out
	PostionInjector: injects into specific position of an array and when it matches the required condition,ejects the array
	LengthInjector: takes values into an array and if length matches its specified value,ejects a new array with the values it received

####Static Helpers map, eachSync,eachAsync,eachSyncMap,eachAsyncMap,filterValues,filterKeys,compose

createMessageMatcher: creates a function that checks the truthy state of a function with a value and returns true or a map with a predefined message of failure
randomString: takes a number and generates an array containing random strings for each index of the array
cycle: runs a function for a specified number of times
merge: merges to maps into a new map,a basic union operation,allows values destructions 
quickSort: provides a restrictive quicksort algorithm on a list
findMiddle: finds the middle value's index in a list of numbers
classMirrorInvokeNamedSupportTest: checks wether the current mirror system allows using named arguments
findLibrary, findClass: finds a class/library with the mirrorsystem
switchUnless: checks if a value is null and switches a default value for it else returns that value
encryptNamedArguments: turns a Map<String,dynamic> into a Map<Symbol,dynamic>
decryptNamedArguments: turns a Map<Symbol,dynamic> into a Map<String,dynamic>
encryptSymbol: turns a string into a symbol
decryptSymbol: turns a symbol into a string
dualPartial: takes a function and returns a function that awaits 2 values which it then runs on the supplied function,a basic partial for 2 values
dualCurry: takes a function and awaits supply of its arguments in a backward(right to left manner), a basic two value curry function
matchMapConditions/matchListConditions: takes a set of functions and runs a value on them,returns a future that completes with an error if any condition function fails
captureMapConditions/captureListConditions: takes a set of functions and runs a value on them,returning a map/list of the return values for those functions,
	allows doing a condition matchers that return errors or messages on why a value failed to pass a condition
compose: takes two functions and binds the return a new function that binds the return value of one as the input of the other

####Example:

	Map<Symbol,dynamic> a = new Map<Symbol,dynamic>();
	Map<String,dynamic> b = new Map<String,dynamic>();
	var cache = Hub.createSymbolCache();
	
	var c = cache.create('c');
	a[new Symbol('a')]='aa';
	b['b']='ba';
		
	assert(cache.create('c') == c);
	assert(Hub.decryptNamedArguments(a) is Map<String,dynamic>);
	assert(Hub.encryptNamedArguments(b) is Map<Symbol,dynamic>);
	
	Hub.captureEachFuture([1,2,3,4,5,6],(n){ if(n != null) return n * 4; }).then((_){
		assert(_.first == 4);
		assert(_.last == 24);
		assert(_.length == 6);
	});
	
	var dist = Hub.createDistributor('example');
  
	dist.on((n){ assert(n is num); });
  
	dist.whenDone((n){  assert(n is num); }); 
	
	dist.emit(4);
	dist.emit(6);
	
	var mutate = Hub.createMutator('mutator');
	mutate.on((n){ return n*4; });
	mutate.on((n){ return n+2; });
	mutate.on((n){ return n/2; });
  
	mutate.whenDone((n){
	   assert(n is num);
	});
	 
	mutate.emit(2);
	mutate.emit(100);
	mutate.emit(1);
	mutate.emit(50);
	 
	var jector = LengthInjector.create(4);
	jector.on((n){
	   assert(n.length == 4);
	});
	  
	jector..push(1)..push(2)..push(3)..push(4);
	var poster = PositionInjector.create(4,(t,c){
	   if(t.length > 3) return true; return false; 
	});
	poster.on((n){
	   assert(n.first == 'sucker');
	   assert(n.length == 4);
	});
	 
	poster..push(0,'sucker')..push(4,'logger')..push(3,'ruber')..push(2,'caller');
	 
	//i noted that its preferable to set the 0 index element at the first of the call or as a separate call,
	//if push(0,item) is put on the last of the .. chain,it will default into an index error,not my fault,its
	//the Map add function system.
	poster.push(0,'crocker');
	poster..push(10,'soccer');
	 
	
	var sparce = SparceList.create();
	sparce.add(0,'john');
	sparce..add(2,'alex')..add(1,'john')..add(5,'mary');
	
	 assert(sparce.sorted().first == 'john');
	 
	var rand = new math.Random();
	var f = null;
	 
	assert(Hub.merge({'a':1},{'a':4,'b':2},override: false)['a'] == 1);
	assert(Hub.merge({'a':1},{'a':4,'b':2})['a'] == 4);

	assert(Hub.filterValues(Hub.map([1,3,32],(e,i,o) => e*3),(e,i,o){ 
	    if(e%2 == 0) return true; 
	    return false; 
	})[0] == 96);

	var isString = Hub.createMessageMatcher('isString','is not a string!',(a){
	    if(a is String) return true;
	    return false;
	});
	  
	assert(isString('alex') == true);
	assert(isString(1) is Map);	
	
	var sum = Hub.dualPartial((a,b) => a+b);
	var diff = Hub.dualCurry((a,b) => a-b);
  
	assert(sum(1)(2) == 3);
	assert(diff(2)(1) == 1);


	var play = State.create({ 'name':'alex','paused': false},{
	  'play': (target,controller){ print('${target['name']} playing song? isPaused: ${target['paused']}'); },
	  'pause': (target,controller){ target['paused'] = true; controller.run('play'); }
	},'player');
	
	var man = StateManager.create(play);
	man.add('play',{
	  'play':(target,control){ target.activate(); target.run('play'); },
	  'pause':(target,control){ }
	});
	man.add('pause',{
	  'play':(target,control){ },
	  'pause':(target,control){ target.run('pause'); target.deactivate(); }
	});
	
	play.run('play'); -> runs the current state play function
	//  man.switchState('play');
	//  no reaction since state is null
	man.run('play'); 
	man.run('pause');
	//switching to play state
	man.switchState('play'); -> if state was pause then calls pause.deactivate(),switches state to play & calls play.activate()
	//should get response with play but not pause
	man.run('play'); 
	man.run('pause');
	//switching to pause state
	man.switchState('pause');
	//pause should respond not play
	man.run('play'); man.run('pause');	
	
	--------------------------------------------- clientside only-----------------------------------------
	
	var strip = JStripe.create(new IFrameElement());
	//adds the contentWindow attribute of the iframe to the targetable list
	strip.fragment('contentWindow');
	
	//add a method fragment for the root element i.e the iframe, for the name attribute
	strip.methodFragment('root','name');

	//add a wrapper for contentWindow.addEventListener but tag it addEvent
	strip.methodFragment('contentWindow','addEvent','addEventListener');
	
	//add a wrapper for contentWindow.addEventListener,no tag hence name it addEventListener
	strip.methodFragment('contentWindow','addEventListener');
	

	//run the name tag of the root
	strip.runOn('root','name')(); => returns the value of name (Iframe.name)

	//run the addEvent tag for contentWindow with arguments [message,Function]
	strip.runOn('contentWindow','addEvent')(['message',(e){
		var message = e['data'];
		print(message);
	},false]);
	
	//run the addEventListener tag for contentWindow with first argument 'message',then supply argument Function,
	//basically we can supply the first argument of that array above,and just supply a single value to the return function
	// which turns that into the above ['message',Function]
	strip.runOn('contentWindow','addEventListener','message')((e){
		print(e['data']);
	});
	
	//applies also for

	strip.runOn('contentWindow','addEvent','message')((e){
		var message = e['data'];
		print(message);
	},false]);