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

126 lines
4.0 KiB
JavaScript

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