|
|
import { id as mid } from "module";
|
|
|
import { AccumulatorFn, Observable, Observer, OperatorFn, Producer, Sink, Subscribable, Unsubscribable } from "./interfaces";
|
|
|
import { TraceSource } from "@implab/core-amd/log/TraceSource";
|
|
|
import { Predicate } from "@implab/core-amd/interfaces";
|
|
|
import { Cancellation } from "@implab/core-amd/Cancellation";
|
|
|
import { Subscription, SubscriptionImpl } from "./SubscriptionImpl";
|
|
|
|
|
|
const trace = TraceSource.get(mid);
|
|
|
|
|
|
const noop = () => { };
|
|
|
|
|
|
const errorFallback = (e: unknown) => trace.error("Unhandled observable error: {0}", e);
|
|
|
|
|
|
|
|
|
type FusedSink<T> = Omit<Sink<T>, "isClosed">;
|
|
|
|
|
|
export const fuse = <T>(producer: Producer<T>) =>
|
|
|
(sink: FusedSink<T>, subscription: Subscription): Unsubscribable => {
|
|
|
|
|
|
subscription.teardown(producer({
|
|
|
next: subscription.around(sink.next),
|
|
|
complete: () => subscription.finalize() && sink.complete(),
|
|
|
error: err => subscription.finalize() && sink.error(err),
|
|
|
isClosed: subscription.isClosed.bind(subscription)
|
|
|
}));
|
|
|
|
|
|
return subscription;
|
|
|
};
|
|
|
|
|
|
type FusedProducer<T> = (sink: FusedSink<T>, subscription: Subscription) => void;
|
|
|
|
|
|
export class ObservableImpl<T> implements Observable<T> {
|
|
|
|
|
|
private readonly _producer: FusedProducer<T>;
|
|
|
|
|
|
constructor(producer: FusedProducer<T>) {
|
|
|
this._producer = producer;
|
|
|
}
|
|
|
|
|
|
subscribe(consumer: Observer<T> = {}): Unsubscribable {
|
|
|
const error = (err: unknown) => consumer.error ? consumer.error(err) : errorFallback(err);
|
|
|
const next = consumer.next ? consumer.next.bind(consumer) : noop;
|
|
|
const complete = () => consumer.complete ? consumer.complete() : void (0);
|
|
|
|
|
|
const subscription = new SubscriptionImpl();
|
|
|
|
|
|
this._producer({ next, error, complete }, subscription);
|
|
|
|
|
|
return subscription;
|
|
|
}
|
|
|
|
|
|
map<T2>(mapper: (value: T) => T2) {
|
|
|
return new ObservableImpl<T2>(({ next, ...rest }, subscription) =>
|
|
|
(0, this._producer)(
|
|
|
{
|
|
|
next: next !== noop ? (v: T) => next(mapper(v)) : noop,
|
|
|
...rest
|
|
|
}, subscription
|
|
|
));
|
|
|
}
|
|
|
|
|
|
tap({ next: tapNext, complete: tapComplete, error: tapError }: Observer<T>) {
|
|
|
return new ObservableImpl<T>(({ next, complete, error }, subscription) =>
|
|
|
(0, this._producer)(
|
|
|
{
|
|
|
next: tapNext ? (v => (tapNext(v), next(v))) : next,
|
|
|
complete: tapComplete ? (() => (tapComplete(), complete())) : complete,
|
|
|
error: tapError ? (e => (tapError(e), error(e))) : error
|
|
|
},
|
|
|
subscription
|
|
|
));
|
|
|
}
|
|
|
|
|
|
filter(predicate: Predicate<T>) {
|
|
|
return new ObservableImpl<T>(({ next, ...rest }, subscription) =>
|
|
|
(0, this._producer)(
|
|
|
{
|
|
|
next: next !== noop ? (v: T) => predicate(v) ? next(v) : void (0) : noop,
|
|
|
...rest
|
|
|
},
|
|
|
subscription
|
|
|
));
|
|
|
}
|
|
|
|
|
|
until(predicate: Predicate<T>) {
|
|
|
return new ObservableImpl<T>(({ next, complete, ...rest }, subscription) =>
|
|
|
(0, this._producer)({
|
|
|
next: v => predicate(v) ? subscription.finalize() && complete() : next(v),
|
|
|
complete,
|
|
|
...rest
|
|
|
}, subscription)
|
|
|
);
|
|
|
}
|
|
|
|
|
|
while(predicate: Predicate<T>) {
|
|
|
return new ObservableImpl<T>(({ next, complete, ...rest }, subscription) =>
|
|
|
(0, this._producer)({
|
|
|
next: v => predicate(v) ? next(v) : subscription.finalize() && complete(),
|
|
|
complete,
|
|
|
...rest
|
|
|
}, subscription)
|
|
|
);
|
|
|
}
|
|
|
|
|
|
scan<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>;
|
|
|
scan(accumulator: AccumulatorFn<T, T>): Observable<T>;
|
|
|
scan<A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) {
|
|
|
if (args.length === 1) {
|
|
|
const [accumulator] = args;
|
|
|
|
|
|
return new ObservableImpl<T | A>(({ next, ...rest }, subscription) => {
|
|
|
let _acc: T;
|
|
|
let index = 0;
|
|
|
(0, this._producer)({
|
|
|
next: next !== noop ? (v: T) => next(
|
|
|
index++ === 0 ? _acc = v : _acc = accumulator(_acc, v)
|
|
|
) : noop,
|
|
|
...rest
|
|
|
}, subscription);
|
|
|
});
|
|
|
} else {
|
|
|
const [accumulator, initial] = args;
|
|
|
return new ObservableImpl<T | A>(({ next, ...rest }, subscription) => {
|
|
|
let _acc = initial;
|
|
|
(0, this._producer)({
|
|
|
next: next !== noop ? (v: T) => next(_acc = accumulator(_acc, v)) : noop,
|
|
|
...rest
|
|
|
}, subscription);
|
|
|
});
|
|
|
}
|
|
|
}
|
|
|
|
|
|
reduce<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>;
|
|
|
reduce(accumulator: AccumulatorFn<T, T>): Observable<T>;
|
|
|
reduce<A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) {
|
|
|
|
|
|
if (args.length === 1) {
|
|
|
const [accumulator] = args;
|
|
|
return new ObservableImpl<T>(({ next, complete, error }, subscription) => {
|
|
|
let _acc: T;
|
|
|
let index = 0;
|
|
|
(0, this._producer)({
|
|
|
next: next !== noop ? (v: T) => {
|
|
|
_acc = index++ === 0 ? v : accumulator(_acc, v);
|
|
|
} : noop,
|
|
|
complete: () => {
|
|
|
if (index === 0) {
|
|
|
error(new Error("The sequence can't be empty"));
|
|
|
} else {
|
|
|
next(_acc);
|
|
|
complete();
|
|
|
}
|
|
|
},
|
|
|
error
|
|
|
}, subscription);
|
|
|
});
|
|
|
} else {
|
|
|
const [accumulator, initial] = args;
|
|
|
return new ObservableImpl<A>(({ next, complete, error }, subscription) => {
|
|
|
let _acc = initial;
|
|
|
(0, this._producer)({
|
|
|
next: next !== noop ? (v: T) => {
|
|
|
_acc = accumulator(_acc, v);
|
|
|
} : noop,
|
|
|
complete: () => {
|
|
|
next(_acc);
|
|
|
complete();
|
|
|
},
|
|
|
error
|
|
|
}, subscription);
|
|
|
});
|
|
|
}
|
|
|
}
|
|
|
|
|
|
cat(...seq: Subscribable<T>[]) {
|
|
|
return new ObservableImpl<T>(({ next, complete: final, ...rest }, subscription) => {
|
|
|
const len = seq.length;
|
|
|
const complete = (i: number) => i < len ?
|
|
|
() => {
|
|
|
h = seq[i].subscribe({ next, complete: complete(i + 1), ...rest });
|
|
|
} : () => subscription.finalize() && final();
|
|
|
|
|
|
|
|
|
let h = this.subscribe({ next, complete: complete(0), ...rest });
|
|
|
subscription.teardown(() => h.unsubscribe());
|
|
|
|
|
|
});
|
|
|
}
|
|
|
|
|
|
pipe<U>(op: OperatorFn<T, U>): Observable<U> {
|
|
|
return op(this);
|
|
|
}
|
|
|
|
|
|
next(ct = Cancellation.none) {
|
|
|
return new Promise<T>((resolve, reject) => {
|
|
|
ct.throwIfRequested();
|
|
|
|
|
|
const subscription = new SubscriptionImpl();
|
|
|
subscription.cancellable(ct, reject);
|
|
|
|
|
|
(0, this._producer)({
|
|
|
next: resolve,
|
|
|
complete: () => reject(new Error("The sequence is empty")),
|
|
|
error: reject,
|
|
|
}, subscription);
|
|
|
|
|
|
});
|
|
|
}
|
|
|
|
|
|
collect(ct = Cancellation.none) {
|
|
|
return new Promise<T[]>((resolve, reject) => {
|
|
|
ct.throwIfRequested();
|
|
|
|
|
|
const subscription = new SubscriptionImpl();
|
|
|
subscription.cancellable(ct, reject);
|
|
|
|
|
|
const acc: T[] = [];
|
|
|
|
|
|
(0, this._producer)({
|
|
|
next: (item: T) => acc.push(item),
|
|
|
complete: () => resolve(acc),
|
|
|
error: reject
|
|
|
}, subscription);
|
|
|
});
|
|
|
}
|
|
|
|
|
|
forEach(next: (item: T) => void, ct = Cancellation.none): Promise<void> {
|
|
|
return new Promise<void>((resolve, reject) => {
|
|
|
ct.throwIfRequested();
|
|
|
|
|
|
const subscription = new SubscriptionImpl();
|
|
|
subscription.cancellable(ct, reject);
|
|
|
|
|
|
(0, this._producer)({
|
|
|
next,
|
|
|
complete: resolve,
|
|
|
error: reject
|
|
|
}, subscription);
|
|
|
});
|
|
|
}
|
|
|
|
|
|
}
|
