rxjs
Version:
Reactive Extensions for modern JavaScript
109 lines • 4.41 kB
JavaScript
;
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
exports.combineLatestInit = exports.combineLatest = void 0;
var Observable_1 = require("../Observable");
var argsArgArrayOrObject_1 = require("../util/argsArgArrayOrObject");
var Subscriber_1 = require("../Subscriber");
var from_1 = require("./from");
var identity_1 = require("../util/identity");
var mapOneOrManyArgs_1 = require("../util/mapOneOrManyArgs");
var args_1 = require("../util/args");
function combineLatest() {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
var scheduler = args_1.popScheduler(args);
var resultSelector = args_1.popResultSelector(args);
var _a = argsArgArrayOrObject_1.argsArgArrayOrObject(args), observables = _a.args, keys = _a.keys;
var result = new Observable_1.Observable(combineLatestInit(observables, scheduler, keys
?
function (values) {
var value = {};
for (var i = 0; i < values.length; i++) {
value[keys[i]] = values[i];
}
return value;
}
:
identity_1.identity));
if (resultSelector) {
return result.pipe(mapOneOrManyArgs_1.mapOneOrManyArgs(resultSelector));
}
return result;
}
exports.combineLatest = combineLatest;
var CombineLatestSubscriber = (function (_super) {
__extends(CombineLatestSubscriber, _super);
function CombineLatestSubscriber(destination, _next, shouldComplete) {
var _this = _super.call(this, destination) || this;
_this._next = _next;
_this.shouldComplete = shouldComplete;
return _this;
}
CombineLatestSubscriber.prototype._complete = function () {
if (this.shouldComplete()) {
_super.prototype._complete.call(this);
}
else {
this.unsubscribe();
}
};
return CombineLatestSubscriber;
}(Subscriber_1.Subscriber));
function combineLatestInit(observables, scheduler, valueTransform) {
if (valueTransform === void 0) { valueTransform = identity_1.identity; }
return function (subscriber) {
var primarySubscribe = function () {
var length = observables.length;
var values = new Array(length);
var active = length;
var hasValues = observables.map(function () { return false; });
var waitingForFirstValues = true;
var emit = function () { return subscriber.next(valueTransform(values.slice())); };
var _loop_1 = function (i) {
var subscribe = function () {
var source = from_1.from(observables[i], scheduler);
source.subscribe(new CombineLatestSubscriber(subscriber, function (value) {
values[i] = value;
if (waitingForFirstValues) {
hasValues[i] = true;
waitingForFirstValues = !hasValues.every(identity_1.identity);
}
if (!waitingForFirstValues) {
emit();
}
}, function () { return --active === 0; }));
};
maybeSchedule(scheduler, subscribe, subscriber);
};
for (var i = 0; i < length; i++) {
_loop_1(i);
}
};
maybeSchedule(scheduler, primarySubscribe, subscriber);
};
}
exports.combineLatestInit = combineLatestInit;
function maybeSchedule(scheduler, execute, subscription) {
if (scheduler) {
subscription.add(scheduler.schedule(execute));
}
else {
execute();
}
}
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