work.suroh.tk/node_modules/rxjs/_esm2015/observable/RangeObservable.js

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2019-12-02 12:22:45 +00:00
import { Observable } from '../Observable';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class RangeObservable extends Observable {
constructor(start, count, scheduler) {
super();
this.start = start;
this._count = count;
this.scheduler = scheduler;
}
/**
* Creates an Observable that emits a sequence of numbers within a specified
* range.
*
* <span class="informal">Emits a sequence of numbers in a range.</span>
*
* <img src="./img/range.png" width="100%">
*
* `range` operator emits a range of sequential integers, in order, where you
* select the `start` of the range and its `length`. By default, uses no
* IScheduler and just delivers the notifications synchronously, but may use
* an optional IScheduler to regulate those deliveries.
*
* @example <caption>Emits the numbers 1 to 10</caption>
* var numbers = Rx.Observable.range(1, 10);
* numbers.subscribe(x => console.log(x));
*
* @see {@link timer}
* @see {@link interval}
*
* @param {number} [start=0] The value of the first integer in the sequence.
* @param {number} [count=0] The number of sequential integers to generate.
* @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
* the emissions of the notifications.
* @return {Observable} An Observable of numbers that emits a finite range of
* sequential integers.
* @static true
* @name range
* @owner Observable
*/
static create(start = 0, count = 0, scheduler) {
return new RangeObservable(start, count, scheduler);
}
static dispatch(state) {
const { start, index, count, subscriber } = state;
if (index >= count) {
subscriber.complete();
return;
}
subscriber.next(start);
if (subscriber.closed) {
return;
}
state.index = index + 1;
state.start = start + 1;
this.schedule(state);
}
/** @deprecated internal use only */ _subscribe(subscriber) {
let index = 0;
let start = this.start;
const count = this._count;
const scheduler = this.scheduler;
if (scheduler) {
return scheduler.schedule(RangeObservable.dispatch, 0, {
index, count, start, subscriber
});
}
else {
do {
if (index++ >= count) {
subscriber.complete();
break;
}
subscriber.next(start++);
if (subscriber.closed) {
break;
}
} while (true);
}
}
}
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