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import { SchedulerAction, SchedulerLike } from '../types';
import { Observable } from '../Observable';
/**
* 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>
*
* 
*
* `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
* {@link SchedulerLike} and just delivers the notifications synchronously, but may use
* an optional {@link SchedulerLike} to regulate those deliveries.
*
* ## Example
* Emits the numbers 1 to 10</caption>
* ```javascript
* const numbers = range(1, 10);
* numbers.subscribe(x => console.log(x));
* ```
* @see {@link timer}
* @see {@link index/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 {SchedulerLike} [scheduler] A {@link SchedulerLike} 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
*/
export function range(start: number = 0,
count: number = 0,
scheduler?: SchedulerLike): Observable<number> {
return new Observable<number>(subscriber => {
let index = 0;
let current = start;
if (scheduler) {
return scheduler.schedule(dispatch, 0, {
index, count, start, subscriber
});
} else {
do {
if (index++ >= count) {
subscriber.complete();
break;
}
subscriber.next(current++);
if (subscriber.closed) {
break;
}
} while (true);
}
return undefined;
});
}
/** @internal */
export function dispatch(this: SchedulerAction<any>, state: any) {
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);
}
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