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'use strict';
// https://github.com/zenparsing/es-observable
var $export = require('./_export')
, global = require('./_global')
, core = require('./_core')
, microtask = require('./_microtask')()
, OBSERVABLE = require('./_wks')('observable')
, aFunction = require('./_a-function')
, anObject = require('./_an-object')
, anInstance = require('./_an-instance')
, redefineAll = require('./_redefine-all')
, hide = require('./_hide')
, forOf = require('./_for-of')
, RETURN = forOf.RETURN;
var getMethod = function(fn){
return fn == null ? undefined : aFunction(fn);
};
var cleanupSubscription = function(subscription){
var cleanup = subscription._c;
if(cleanup){
subscription._c = undefined;
cleanup();
}
};
var subscriptionClosed = function(subscription){
return subscription._o === undefined;
};
var closeSubscription = function(subscription){
if(!subscriptionClosed(subscription)){
subscription._o = undefined;
cleanupSubscription(subscription);
}
};
var Subscription = function(observer, subscriber){
anObject(observer);
this._c = undefined;
this._o = observer;
observer = new SubscriptionObserver(this);
try {
var cleanup = subscriber(observer)
, subscription = cleanup;
if(cleanup != null){
if(typeof cleanup.unsubscribe === 'function')cleanup = function(){ subscription.unsubscribe(); };
else aFunction(cleanup);
this._c = cleanup;
}
} catch(e){
observer.error(e);
return;
} if(subscriptionClosed(this))cleanupSubscription(this);
};
Subscription.prototype = redefineAll({}, {
unsubscribe: function unsubscribe(){ closeSubscription(this); }
});
var SubscriptionObserver = function(subscription){
this._s = subscription;
};
SubscriptionObserver.prototype = redefineAll({}, {
next: function next(value){
var subscription = this._s;
if(!subscriptionClosed(subscription)){
var observer = subscription._o;
try {
var m = getMethod(observer.next);
if(m)return m.call(observer, value);
} catch(e){
try {
closeSubscription(subscription);
} finally {
throw e;
}
}
}
},
error: function error(value){
var subscription = this._s;
if(subscriptionClosed(subscription))throw value;
var observer = subscription._o;
subscription._o = undefined;
try {
var m = getMethod(observer.error);
if(!m)throw value;
value = m.call(observer, value);
} catch(e){
try {
cleanupSubscription(subscription);
} finally {
throw e;
}
} cleanupSubscription(subscription);
return value;
},
complete: function complete(value){
var subscription = this._s;
if(!subscriptionClosed(subscription)){
var observer = subscription._o;
subscription._o = undefined;
try {
var m = getMethod(observer.complete);
value = m ? m.call(observer, value) : undefined;
} catch(e){
try {
cleanupSubscription(subscription);
} finally {
throw e;
}
} cleanupSubscription(subscription);
return value;
}
}
});
var $Observable = function Observable(subscriber){
anInstance(this, $Observable, 'Observable', '_f')._f = aFunction(subscriber);
};
redefineAll($Observable.prototype, {
subscribe: function subscribe(observer){
return new Subscription(observer, this._f);
},
forEach: function forEach(fn){
var that = this;
return new (core.Promise || global.Promise)(function(resolve, reject){
aFunction(fn);
var subscription = that.subscribe({
next : function(value){
try {
return fn(value);
} catch(e){
reject(e);
subscription.unsubscribe();
}
},
error: reject,
complete: resolve
});
});
}
});
redefineAll($Observable, {
from: function from(x){
var C = typeof this === 'function' ? this : $Observable;
var method = getMethod(anObject(x)[OBSERVABLE]);
if(method){
var observable = anObject(method.call(x));
return observable.constructor === C ? observable : new C(function(observer){
return observable.subscribe(observer);
});
}
return new C(function(observer){
var done = false;
microtask(function(){
if(!done){
try {
if(forOf(x, false, function(it){
observer.next(it);
if(done)return RETURN;
}) === RETURN)return;
} catch(e){
if(done)throw e;
observer.error(e);
return;
} observer.complete();
}
});
return function(){ done = true; };
});
},
of: function of(){
for(var i = 0, l = arguments.length, items = Array(l); i < l;)items[i] = arguments[i++];
return new (typeof this === 'function' ? this : $Observable)(function(observer){
var done = false;
microtask(function(){
if(!done){
for(var i = 0; i < items.length; ++i){
observer.next(items[i]);
if(done)return;
} observer.complete();
}
});
return function(){ done = true; };
});
}
});
hide($Observable.prototype, OBSERVABLE, function(){ return this; });
$export($export.G, {Observable: $Observable});
require('./_set-species')('Observable');
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