work.suroh.tk/node_modules/rxjs/_esm2015/util/subscribeToResult.js

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2019-12-02 12:22:45 +00:00
import { root } from './root';
import { isArrayLike } from './isArrayLike';
import { isPromise } from './isPromise';
import { isObject } from './isObject';
import { Observable } from '../Observable';
import { iterator as Symbol_iterator } from '../symbol/iterator';
import { InnerSubscriber } from '../InnerSubscriber';
import { observable as Symbol_observable } from '../symbol/observable';
export function subscribeToResult(outerSubscriber, result, outerValue, outerIndex) {
let destination = new InnerSubscriber(outerSubscriber, outerValue, outerIndex);
if (destination.closed) {
return null;
}
if (result instanceof Observable) {
if (result._isScalar) {
destination.next(result.value);
destination.complete();
return null;
}
else {
destination.syncErrorThrowable = true;
return result.subscribe(destination);
}
}
else if (isArrayLike(result)) {
for (let i = 0, len = result.length; i < len && !destination.closed; i++) {
destination.next(result[i]);
}
if (!destination.closed) {
destination.complete();
}
}
else if (isPromise(result)) {
result.then((value) => {
if (!destination.closed) {
destination.next(value);
destination.complete();
}
}, (err) => destination.error(err))
.then(null, (err) => {
// Escaping the Promise trap: globally throw unhandled errors
root.setTimeout(() => { throw err; });
});
return destination;
}
else if (result && typeof result[Symbol_iterator] === 'function') {
const iterator = result[Symbol_iterator]();
do {
let item = iterator.next();
if (item.done) {
destination.complete();
break;
}
destination.next(item.value);
if (destination.closed) {
break;
}
} while (true);
}
else if (result && typeof result[Symbol_observable] === 'function') {
const obs = result[Symbol_observable]();
if (typeof obs.subscribe !== 'function') {
destination.error(new TypeError('Provided object does not correctly implement Symbol.observable'));
}
else {
return obs.subscribe(new InnerSubscriber(outerSubscriber, outerValue, outerIndex));
}
}
else {
const value = isObject(result) ? 'an invalid object' : `'${result}'`;
const msg = `You provided ${value} where a stream was expected.`
+ ' You can provide an Observable, Promise, Array, or Iterable.';
destination.error(new TypeError(msg));
}
return null;
}
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