work.suroh.tk/node_modules/rxjs/_esm5/util/subscribeToResult.js

79 lines
3.0 KiB
JavaScript

/** PURE_IMPORTS_START ._root,._isArrayLike,._isPromise,._isObject,.._Observable,.._symbol_iterator,.._InnerSubscriber,.._symbol_observable PURE_IMPORTS_END */
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) {
var 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 (var 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(function (value) {
if (!destination.closed) {
destination.next(value);
destination.complete();
}
}, function (err) { return destination.error(err); })
.then(null, function (err) {
// Escaping the Promise trap: globally throw unhandled errors
root.setTimeout(function () { throw err; });
});
return destination;
}
else if (result && typeof result[Symbol_iterator] === 'function') {
var iterator = result[Symbol_iterator]();
do {
var 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') {
var 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 {
var value = isObject(result) ? 'an invalid object' : "'" + result + "'";
var 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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