217 lines
33 KiB
Plaintext
217 lines
33 KiB
Plaintext
import { __extends } from "/_nuxt/node_modules/tslib/tslib.es6.js?v=e4f18c29";
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import { Observable } from "/_nuxt/node_modules/@apollo/client/utilities/observables/Observable.js?v=e4f18c29";
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import { iterateObserversSafely } from "/_nuxt/node_modules/@apollo/client/utilities/observables/iteration.js?v=e4f18c29";
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import { fixObservableSubclass } from "/_nuxt/node_modules/@apollo/client/utilities/observables/subclassing.js?v=e4f18c29";
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function isPromiseLike(value) {
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return value && typeof value.then === "function";
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}
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// A Concast<T> observable concatenates the given sources into a single
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// non-overlapping sequence of Ts, automatically unwrapping any promises,
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// and broadcasts the T elements of that sequence to any number of
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// subscribers, all without creating a bunch of intermediary Observable
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// wrapper objects.
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//
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// Even though any number of observers can subscribe to the Concast, each
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// source observable is guaranteed to receive at most one subscribe call,
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// and the results are multicast to all observers.
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//
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// In addition to broadcasting every next/error message to this.observers,
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// the Concast stores the most recent message using this.latest, so any
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// new observers can immediately receive the latest message, even if it
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// was originally delivered in the past. This behavior means we can assume
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// every active observer in this.observers has received the same most
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// recent message.
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//
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// With the exception of this.latest replay, a Concast is a "hot"
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// observable in the sense that it does not replay past results from the
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// beginning of time for each new observer.
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//
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// Could we have used some existing RxJS class instead? Concast<T> is
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// similar to a BehaviorSubject<T>, because it is multicast and redelivers
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// the latest next/error message to new subscribers. Unlike Subject<T>,
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// Concast<T> does not expose an Observer<T> interface (this.handlers is
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// intentionally private), since Concast<T> gets its inputs from the
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// concatenated sources. If we ever switch to RxJS, there may be some
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// value in reusing their code, but for now we use zen-observable, which
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// does not contain any Subject implementations.
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var Concast = /** @class */ (function (_super) {
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__extends(Concast, _super);
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// Not only can the individual elements of the iterable be promises, but
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// also the iterable itself can be wrapped in a promise.
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function Concast(sources) {
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var _this = _super.call(this, function (observer) {
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_this.addObserver(observer);
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return function () { return _this.removeObserver(observer); };
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}) || this;
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// Active observers receiving broadcast messages. Thanks to this.latest,
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// we can assume all observers in this Set have received the same most
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// recent message, though possibly at different times in the past.
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_this.observers = new Set();
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_this.promise = new Promise(function (resolve, reject) {
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_this.resolve = resolve;
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_this.reject = reject;
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});
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// Bound handler functions that can be reused for every internal
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// subscription.
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_this.handlers = {
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next: function (result) {
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if (_this.sub !== null) {
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_this.latest = ["next", result];
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_this.notify("next", result);
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iterateObserversSafely(_this.observers, "next", result);
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}
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},
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error: function (error) {
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var sub = _this.sub;
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if (sub !== null) {
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// Delay unsubscribing from the underlying subscription slightly,
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// so that immediately subscribing another observer can keep the
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// subscription active.
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if (sub)
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setTimeout(function () { return sub.unsubscribe(); });
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_this.sub = null;
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_this.latest = ["error", error];
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_this.reject(error);
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_this.notify("error", error);
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iterateObserversSafely(_this.observers, "error", error);
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}
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},
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complete: function () {
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var _a = _this, sub = _a.sub, _b = _a.sources, sources = _b === void 0 ? [] : _b;
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if (sub !== null) {
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// If complete is called before concast.start, this.sources may be
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// undefined, so we use a default value of [] for sources. That works
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// here because it falls into the if (!value) {...} block, which
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// appropriately terminates the Concast, even if this.sources might
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// eventually have been initialized to a non-empty array.
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var value = sources.shift();
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if (!value) {
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if (sub)
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setTimeout(function () { return sub.unsubscribe(); });
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_this.sub = null;
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if (_this.latest && _this.latest[0] === "next") {
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_this.resolve(_this.latest[1]);
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}
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else {
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_this.resolve();
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}
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_this.notify("complete");
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// We do not store this.latest = ["complete"], because doing so
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// discards useful information about the previous next (or
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// error) message. Instead, if new observers subscribe after
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// this Concast has completed, they will receive the final
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// 'next' message (unless there was an error) immediately
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// followed by a 'complete' message (see addObserver).
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iterateObserversSafely(_this.observers, "complete");
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}
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else if (isPromiseLike(value)) {
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value.then(function (obs) { return (_this.sub = obs.subscribe(_this.handlers)); }, _this.handlers.error);
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}
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else {
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_this.sub = value.subscribe(_this.handlers);
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}
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}
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},
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};
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_this.nextResultListeners = new Set();
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// A public way to abort observation and broadcast.
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_this.cancel = function (reason) {
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_this.reject(reason);
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_this.sources = [];
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_this.handlers.error(reason);
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};
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// Suppress rejection warnings for this.promise, since it's perfectly
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// acceptable to pay no attention to this.promise if you're consuming
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// the results through the normal observable API.
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_this.promise.catch(function (_) { });
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// If someone accidentally tries to create a Concast using a subscriber
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// function, recover by creating an Observable from that subscriber and
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// using it as the source.
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if (typeof sources === "function") {
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sources = [new Observable(sources)];
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}
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if (isPromiseLike(sources)) {
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sources.then(function (iterable) { return _this.start(iterable); }, _this.handlers.error);
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}
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else {
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_this.start(sources);
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}
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return _this;
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}
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Concast.prototype.start = function (sources) {
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if (this.sub !== void 0)
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return;
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// In practice, sources is most often simply an Array of observables.
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// TODO Consider using sources[Symbol.iterator]() to take advantage
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// of the laziness of non-Array iterables.
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this.sources = Array.from(sources);
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// Calling this.handlers.complete() kicks off consumption of the first
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// source observable. It's tempting to do this step lazily in
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// addObserver, but this.promise can be accessed without calling
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// addObserver, so consumption needs to begin eagerly.
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this.handlers.complete();
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};
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Concast.prototype.deliverLastMessage = function (observer) {
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if (this.latest) {
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var nextOrError = this.latest[0];
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var method = observer[nextOrError];
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if (method) {
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method.call(observer, this.latest[1]);
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}
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// If the subscription is already closed, and the last message was
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// a 'next' message, simulate delivery of the final 'complete'
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// message again.
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if (this.sub === null && nextOrError === "next" && observer.complete) {
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observer.complete();
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}
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}
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};
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Concast.prototype.addObserver = function (observer) {
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if (!this.observers.has(observer)) {
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// Immediately deliver the most recent message, so we can always
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// be sure all observers have the latest information.
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this.deliverLastMessage(observer);
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this.observers.add(observer);
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}
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};
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Concast.prototype.removeObserver = function (observer) {
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if (this.observers.delete(observer) && this.observers.size < 1) {
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// In case there are still any listeners in this.nextResultListeners, and
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// no error or completion has been broadcast yet, make sure those
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// observers have a chance to run and then remove themselves from
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// this.observers.
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this.handlers.complete();
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}
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};
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Concast.prototype.notify = function (method, arg) {
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var nextResultListeners = this.nextResultListeners;
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if (nextResultListeners.size) {
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// Replacing this.nextResultListeners first ensures it does not grow while
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// we are iterating over it, potentially leading to infinite loops.
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this.nextResultListeners = new Set();
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nextResultListeners.forEach(function (listener) { return listener(method, arg); });
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}
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};
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// We need a way to run callbacks just *before* the next result (or error or
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// completion) is delivered by this Concast, so we can be sure any code that
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// runs as a result of delivering that result/error observes the effects of
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// running the callback(s). It was tempting to reuse the Observer type instead
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// of introducing NextResultListener, but that messes with the sizing and
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// maintenance of this.observers, and ends up being more code overall.
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Concast.prototype.beforeNext = function (callback) {
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var called = false;
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this.nextResultListeners.add(function (method, arg) {
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if (!called) {
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called = true;
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callback(method, arg);
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}
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});
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};
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return Concast;
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}(Observable));
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export { Concast };
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// Necessary because the Concast constructor has a different signature
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// than the Observable constructor.
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fixObservableSubclass(Concast);
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type {\n  Observer,\n  ObservableSubscription,\n  Subscriber,\n} from \"./Observable.js\";\nimport { Observable } from \"./Observable.js\";\nimport { iterateObserversSafely } from \"./iteration.js\";\nimport { fixObservableSubclass } from \"./subclassing.js\";\n\ntype MaybeAsync<T> = T | PromiseLike<T>;\n\nfunction isPromiseLike<T>(value: MaybeAsync<T>): value is PromiseLike<T> {\n  return value && typeof (value as any).then === \"function\";\n}\n\n// Any individual Source<T> can be an Observable<T> or a promise for one.\ntype Source<T> = MaybeAsync<Observable<T>>;\n\nexport type ConcastSourcesIterable<T> = Iterable<Source<T>>;\nexport type ConcastSourcesArray<T> = Array<Source<T>>;\n\n// A Concast<T> observable concatenates the given sources into a single\n// non-overlapping sequence of Ts, automatically unwrapping any promises,\n// and broadcasts the T elements of that sequence to any number of\n// subscribers, all without creating a bunch of intermediary Observable\n// wrapper objects.\n//\n// Even though any number of observers can subscribe to the Concast, each\n// source observable is guaranteed to receive at most one subscribe call,\n// and the results are multicast to all observers.\n//\n// In addition to broadcasting every next/error message to this.observers,\n// the Concast stores the most recent message using this.latest, so any\n// new observers can immediately receive the latest message, even if it\n// was originally delivered in the past. This behavior means we can assume\n// every active observer in this.observers has received the same most\n// recent message.\n//\n// With the exception of this.latest replay, a Concast is a \"hot\"\n// observable in the sense that it does not replay past results from the\n// beginning of time for each new observer.\n//\n// Could we have used some existing RxJS class instead? Concast<T> is\n// similar to a BehaviorSubject<T>, because it is multicast and redelivers\n// the latest next/error message to new subscribers. Unlike Subject<T>,\n// Concast<T> does not expose an Observer<T> interface (this.handlers is\n// intentionally private), since Concast<T> gets its inputs from the\n// concatenated sources. If we ever switch to RxJS, there may be some\n// value in reusing their code, but for now we use zen-observable, which\n// does not contain any Subject implementations.\nexport class Concast<T> extends Observable<T> {\n  // Active observers receiving broadcast messages. Thanks to this.latest,\n  // we can assume all observers in this Set have received the same most\n  // recent message, though possibly at different times in the past.\n  private observers = new Set<Observer<T>>();\n\n  // This property starts off undefined to indicate the initial\n  // subscription has not yet begun, then points to each source\n  // subscription in turn, and finally becomes null after the sources have\n  // been exhausted. After that, it stays null.\n  private sub?: ObservableSubscription | null;\n\n  // Not only can the individual elements of the iterable be promises, but\n  // also the iterable itself can be wrapped in a promise.\n  constructor(sources: MaybeAsync<ConcastSourcesIterable<T>> | Subscriber<T>) {\n    super((observer) => {\n      this.addObserver(observer);\n      return () => this.removeObserver(observer);\n    });\n\n    // Suppress rejection warnings for this.promise, since it's perfectly\n    // acceptable to pay no attention to this.promise if you're consuming\n    // the results through the normal observable API.\n    this.promise.catch((_) => {});\n\n    // If someone accidentally tries to create a Concast using a subscriber\n    // function, recover by creating an Observable from that subscriber and\n    // using it as the source.\n    if (typeof sources === \"function\") {\n      sources = [new Observable(sources)];\n    }\n\n    if (isPromiseLike(sources)) {\n      sources.then((iterable) => this.start(iterable), this.handlers.error);\n    } else {\n      this.start(sources);\n    }\n  }\n\n  // A consumable array of source observables, incrementally consumed each time\n  // this.handlers.complete is called. This private field is not initialized\n  // until the concast.start method is called, which can happen asynchronously\n  // if a Promise is passed to the Concast constructor, so undefined is a\n  // possible value for this.sources before concast.start is called.\n  private sources: Source<T>[] | undefined;\n\n  private start(sources: ConcastSourcesIterable<T>) {\n    if (this.sub !== void 0) return;\n\n    // In practice, sources is most often simply an Array of observables.\n    // TODO Consider using sources[Symbol.iterator]() to take advantage\n    // of the laziness of non-Array iterables.\n    this.sources = Array.from(sources);\n\n    // Calling this.handlers.complete() kicks off consumption of the first\n    // source observable. It's tempting to do this step lazily in\n    // addObserver, but this.promise can be accessed without calling\n    // addObserver, so consumption needs to begin eagerly.\n    this.handlers.complete();\n  }\n\n  private deliverLastMessage(observer: Observer<T>) {\n    if (this.latest) {\n      const nextOrError = this.latest[0];\n      const method = observer[nextOrError];\n      if (method) {\n        method.call(observer, this.latest[1]);\n      }\n      // If the subscription is already closed, and the last message was\n      // a 'next' message, simulate delivery of the final 'complete'\n      // message again.\n      if (this.sub === null && nextOrError === \"next\" && observer.complete) {\n        observer.complete();\n      }\n    }\n  }\n\n  public addObserver(observer: Observer<T>) {\n    if (!this.observers.has(observer)) {\n      // Immediately deliver the most recent message, so we can always\n      // be sure all observers have the latest information.\n      this.deliverLastMessage(observer);\n      this.observers.add(observer);\n    }\n  }\n\n  public removeObserver(observer: Observer<T>) {\n    if (this.observers.delete(observer) && this.observers.size < 1) {\n      // In case there are still any listeners in this.nextResultListeners, and\n      // no error or completion has been broadcast yet, make sure those\n      // observers have a chance to run and then remove themselves from\n      // this.observers.\n      this.handlers.complete();\n    }\n  }\n\n  // Any Concast object can be trivially converted to a Promise, without\n  // having to create a new wrapper Observable. This promise provides an\n  // easy way to observe the final state of the Concast.\n  private resolve!: (result?: T | PromiseLike<T>) => void;\n  private reject!: (reason: any) => void;\n  public readonly promise = new Promise<T | undefined>((resolve, reject) => {\n    this.resolve = resolve;\n    this.reject = reject;\n  });\n\n  // Name and argument of the most recently invoked observer method, used\n  // to deliver latest results immediately to new observers.\n  private latest?: [\"next\", T] | [\"error\", any];\n\n  // Bound handler functions that can be reused for every internal\n  // subscription.\n  private handlers = {\n    next: (result: T) => {\n      if (this.sub !== null) {\n        this.latest = [\"next\", result];\n        this.notify(\"next\", result);\n        iterateObserversSafely(this.observers, \"next\", result);\n      }\n    },\n\n    error: (error: any) => {\n      const { sub } = this;\n      if (sub !== null) {\n        // Delay unsubscribing from the underlying subscription slightly,\n        // so that immediately subscribing another observer can keep the\n        // subscription active.\n        if (sub) setTimeout(() => sub.unsubscribe());\n        this.sub = null;\n        this.latest = [\"error\", error];\n        this.reject(error);\n        this.notify(\"error\", error);\n        iterateObserversSafely(this.observers, \"error\", error);\n      }\n    },\n\n    complete: () => {\n      const { sub, sources = [] } = this;\n      if (sub !== null) {\n        // If complete is called before concast.start, this.sources may be\n        // undefined, so we use a default value of [] for sources. That works\n        // here because it falls into the if (!value) {...} block, which\n        // appropriately terminates the Concast, even if this.sources might\n        // eventually have been initialized to a non-empty array.\n        const value = sources.shift();\n        if (!value) {\n          if (sub) setTimeout(() => sub.unsubscribe());\n          this.sub = null;\n          if (this.latest && this.latest[0] === \"next\") {\n            this.resolve(this.latest[1]);\n          } else {\n            this.resolve();\n          }\n          this.notify(\"complete\");\n          // We do not store this.latest = [\"complete\"], because doing so\n          // discards useful information about the previous next (or\n          // error) message. Instead, if new observers subscribe after\n          // this Concast has completed, they will receive the final\n          // 'next' message (unless there was an error) immediately\n          // followed by a 'complete' message (see addObserver).\n          iterateObserversSafely(this.observers, \"complete\");\n        } else if (isPromiseLike(value)) {\n          value.then(\n            (obs) => (this.sub = obs.subscribe(this.handlers)),\n            this.handlers.error\n          );\n        } else {\n          this.sub = value.subscribe(this.handlers);\n        }\n      }\n    },\n  };\n\n  private nextResultListeners = new Set<NextResultListener>();\n\n  private notify(\n    method: Parameters<NextResultListener>[0],\n    arg?: Parameters<NextResultListener>[1]\n  ) {\n    const { nextResultListeners } = this;\n    if (nextResultListeners.size) {\n      // Replacing this.nextResultListeners first ensures it does not grow while\n      // we are iterating over it, potentially leading to infinite loops.\n      this.nextResultListeners = new Set();\n      nextResultListeners.forEach((listener) => listener(method, arg));\n    }\n  }\n\n  // We need a way to run callbacks just *before* the next result (or error or\n  // completion) is delivered by this Concast, so we can be sure any code that\n  // runs as a result of delivering that result/error observes the effects of\n  // running the callback(s). It was tempting to reuse the Observer type instead\n  // of introducing NextResultListener, but that messes with the sizing and\n  // maintenance of this.observers, and ends up being more code overall.\n  beforeNext(callback: NextResultListener) {\n    let called = false;\n    this.nextResultListeners.add((method, arg) => {\n      if (!called) {\n        called = true;\n        callback(method, arg);\n      }\n    });\n  }\n\n  // A public way to abort observation and broadcast.\n  public cancel = (reason: any) => {\n    this.reject(reason);\n    this.sources = [];\n    this.handlers.error(reason);\n  };\n}\n\ntype NextResultListener = (\n  method: \"next\" | \"error\" | \"complete\",\n  arg?: any\n) => any;\n\n// Necessary because the Concast constructor has a different signature\n// than the Observable constructor.\nfixObservableSubclass(Concast);\n"],"x_google_ignoreList":[0]} |