133 lines
No EOL
4.5 KiB
JavaScript
133 lines
No EOL
4.5 KiB
JavaScript
import { isArray } from './util/isArray';
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import { isObject } from './util/isObject';
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import { isFunction } from './util/isFunction';
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import { UnsubscriptionError } from './util/UnsubscriptionError';
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export class Subscription {
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constructor(unsubscribe) {
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this.closed = false;
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this._parentOrParents = null;
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this._subscriptions = null;
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if (unsubscribe) {
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this._unsubscribe = unsubscribe;
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}
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}
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unsubscribe() {
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let errors;
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if (this.closed) {
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return;
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}
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let { _parentOrParents, _unsubscribe, _subscriptions } = this;
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this.closed = true;
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this._parentOrParents = null;
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this._subscriptions = null;
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if (_parentOrParents instanceof Subscription) {
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_parentOrParents.remove(this);
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}
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else if (_parentOrParents !== null) {
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for (let index = 0; index < _parentOrParents.length; ++index) {
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const parent = _parentOrParents[index];
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parent.remove(this);
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}
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}
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if (isFunction(_unsubscribe)) {
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try {
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_unsubscribe.call(this);
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}
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catch (e) {
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errors = e instanceof UnsubscriptionError ? flattenUnsubscriptionErrors(e.errors) : [e];
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}
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}
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if (isArray(_subscriptions)) {
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let index = -1;
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let len = _subscriptions.length;
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while (++index < len) {
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const sub = _subscriptions[index];
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if (isObject(sub)) {
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try {
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sub.unsubscribe();
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}
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catch (e) {
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errors = errors || [];
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if (e instanceof UnsubscriptionError) {
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errors = errors.concat(flattenUnsubscriptionErrors(e.errors));
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}
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else {
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errors.push(e);
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}
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}
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}
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}
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}
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if (errors) {
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throw new UnsubscriptionError(errors);
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}
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}
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add(teardown) {
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let subscription = teardown;
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if (!teardown) {
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return Subscription.EMPTY;
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}
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switch (typeof teardown) {
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case 'function':
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subscription = new Subscription(teardown);
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case 'object':
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if (subscription === this || subscription.closed || typeof subscription.unsubscribe !== 'function') {
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return subscription;
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}
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else if (this.closed) {
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subscription.unsubscribe();
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return subscription;
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}
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else if (!(subscription instanceof Subscription)) {
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const tmp = subscription;
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subscription = new Subscription();
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subscription._subscriptions = [tmp];
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}
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break;
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default: {
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throw new Error('unrecognized teardown ' + teardown + ' added to Subscription.');
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}
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}
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let { _parentOrParents } = subscription;
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if (_parentOrParents === null) {
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subscription._parentOrParents = this;
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}
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else if (_parentOrParents instanceof Subscription) {
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if (_parentOrParents === this) {
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return subscription;
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}
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subscription._parentOrParents = [_parentOrParents, this];
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}
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else if (_parentOrParents.indexOf(this) === -1) {
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_parentOrParents.push(this);
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}
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else {
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return subscription;
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}
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const subscriptions = this._subscriptions;
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if (subscriptions === null) {
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this._subscriptions = [subscription];
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}
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else {
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subscriptions.push(subscription);
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}
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return subscription;
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}
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remove(subscription) {
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const subscriptions = this._subscriptions;
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if (subscriptions) {
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const subscriptionIndex = subscriptions.indexOf(subscription);
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if (subscriptionIndex !== -1) {
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subscriptions.splice(subscriptionIndex, 1);
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}
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}
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}
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}
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Subscription.EMPTY = (function (empty) {
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empty.closed = true;
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return empty;
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}(new Subscription()));
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function flattenUnsubscriptionErrors(errors) {
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return errors.reduce((errs, err) => errs.concat((err instanceof UnsubscriptionError) ? err.errors : err), []);
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}
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//# sourceMappingURL=Subscription.js.map
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