126 lines
4.0 KiB
JavaScript
126 lines
4.0 KiB
JavaScript
import { Observable } from '../Observable';
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import { isScheduler } from '../util/isScheduler';
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const selfSelector = (value) => value;
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @extends {Ignored}
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* @hide true
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*/
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export class GenerateObservable extends Observable {
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constructor(initialState, condition, iterate, resultSelector, scheduler) {
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super();
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this.initialState = initialState;
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this.condition = condition;
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this.iterate = iterate;
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this.resultSelector = resultSelector;
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this.scheduler = scheduler;
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}
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static create(initialStateOrOptions, condition, iterate, resultSelectorOrObservable, scheduler) {
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if (arguments.length == 1) {
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return new GenerateObservable(initialStateOrOptions.initialState, initialStateOrOptions.condition, initialStateOrOptions.iterate, initialStateOrOptions.resultSelector || selfSelector, initialStateOrOptions.scheduler);
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}
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if (resultSelectorOrObservable === undefined || isScheduler(resultSelectorOrObservable)) {
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return new GenerateObservable(initialStateOrOptions, condition, iterate, selfSelector, resultSelectorOrObservable);
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}
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return new GenerateObservable(initialStateOrOptions, condition, iterate, resultSelectorOrObservable, scheduler);
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}
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/** @deprecated internal use only */ _subscribe(subscriber) {
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let state = this.initialState;
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if (this.scheduler) {
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return this.scheduler.schedule(GenerateObservable.dispatch, 0, {
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subscriber,
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iterate: this.iterate,
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condition: this.condition,
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resultSelector: this.resultSelector,
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state });
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}
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const { condition, resultSelector, iterate } = this;
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do {
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if (condition) {
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let conditionResult;
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try {
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conditionResult = condition(state);
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}
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catch (err) {
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subscriber.error(err);
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return;
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}
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if (!conditionResult) {
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subscriber.complete();
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break;
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}
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}
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let value;
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try {
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value = resultSelector(state);
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}
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catch (err) {
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subscriber.error(err);
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return;
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}
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subscriber.next(value);
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if (subscriber.closed) {
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break;
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}
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try {
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state = iterate(state);
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}
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catch (err) {
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subscriber.error(err);
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return;
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}
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} while (true);
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}
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static dispatch(state) {
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const { subscriber, condition } = state;
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if (subscriber.closed) {
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return;
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}
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if (state.needIterate) {
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try {
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state.state = state.iterate(state.state);
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}
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catch (err) {
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subscriber.error(err);
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return;
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}
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}
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else {
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state.needIterate = true;
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}
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if (condition) {
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let conditionResult;
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try {
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conditionResult = condition(state.state);
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}
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catch (err) {
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subscriber.error(err);
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return;
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}
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if (!conditionResult) {
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subscriber.complete();
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return;
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}
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if (subscriber.closed) {
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return;
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}
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}
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let value;
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try {
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value = state.resultSelector(state.state);
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}
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catch (err) {
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subscriber.error(err);
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return;
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}
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if (subscriber.closed) {
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return;
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}
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subscriber.next(value);
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if (subscriber.closed) {
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return;
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}
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return this.schedule(state);
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}
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}
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//# sourceMappingURL=GenerateObservable.js.map
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