85 lines
2.8 KiB
JavaScript
85 lines
2.8 KiB
JavaScript
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import { Observable } from '../Observable';
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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 RangeObservable extends Observable {
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constructor(start, count, scheduler) {
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super();
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this.start = start;
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this._count = count;
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this.scheduler = scheduler;
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}
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/**
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* Creates an Observable that emits a sequence of numbers within a specified
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* range.
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*
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* <span class="informal">Emits a sequence of numbers in a range.</span>
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*
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* <img src="./img/range.png" width="100%">
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*
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* `range` operator emits a range of sequential integers, in order, where you
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* select the `start` of the range and its `length`. By default, uses no
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* IScheduler and just delivers the notifications synchronously, but may use
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* an optional IScheduler to regulate those deliveries.
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*
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* @example <caption>Emits the numbers 1 to 10</caption>
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* var numbers = Rx.Observable.range(1, 10);
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* numbers.subscribe(x => console.log(x));
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*
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* @see {@link timer}
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* @see {@link interval}
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*
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* @param {number} [start=0] The value of the first integer in the sequence.
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* @param {number} [count=0] The number of sequential integers to generate.
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* @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
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* the emissions of the notifications.
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* @return {Observable} An Observable of numbers that emits a finite range of
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* sequential integers.
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* @static true
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* @name range
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* @owner Observable
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*/
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static create(start = 0, count = 0, scheduler) {
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return new RangeObservable(start, count, scheduler);
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}
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static dispatch(state) {
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const { start, index, count, subscriber } = state;
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if (index >= count) {
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subscriber.complete();
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return;
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}
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subscriber.next(start);
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if (subscriber.closed) {
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return;
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}
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state.index = index + 1;
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state.start = start + 1;
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this.schedule(state);
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}
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/** @deprecated internal use only */ _subscribe(subscriber) {
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let index = 0;
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let start = this.start;
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const count = this._count;
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const scheduler = this.scheduler;
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if (scheduler) {
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return scheduler.schedule(RangeObservable.dispatch, 0, {
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index, count, start, subscriber
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});
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}
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else {
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do {
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if (index++ >= count) {
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subscriber.complete();
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break;
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}
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subscriber.next(start++);
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if (subscriber.closed) {
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break;
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}
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} while (true);
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}
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}
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}
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//# sourceMappingURL=RangeObservable.js.map
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