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WIP observables
WIP observables
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r157:f9518367061a default
r157:f9518367061a default
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ObservableImpl.ts
263 lines | 8.8 KiB | video/mp2t | TypeScriptLexer
/ djx / src / main / ts / observable / ObservableImpl.ts
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cin
Movin the observable implementation to the class
 r153 import { id as mid } from "module";
cin
WIP observables
 r157 import { AccumulatorFn, Observable, Observer, OperatorFn, Producer, Sink, Subscribable, Unsubscribable } from "./interfaces";
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 r153 import { TraceSource } from "@implab/core-amd/log/TraceSource";
cin
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 r155 import { Predicate } from "@implab/core-amd/interfaces";
import { Cancellation } from "@implab/core-amd/Cancellation";
cin
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 r153
const trace = TraceSource.get(mid);
const noop = () => { };
const errorFallback = (e: unknown) => trace.error("Unhandled observable error: {0}", e);
cin
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 r157 const subscription = (reject: (err: unknown) => void, ct = Cancellation.none) => {
cin
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 r155 let done = false;
let cleanup = noop;
const finalize = () => done ? false : (cleanup(), done = true);
const isClosed = () => done;
const teardown = (cb: void | (() => void)) => {
if (cb) {
if (done) {
cb();
} else {
const _prev = cleanup;
cin
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 r157 cleanup = _prev === noop ? cb : () => (_prev(), cb());
cin
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 r155 }
}
cin
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 r153 };
cin
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 r155
cin
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 r157 const error = (err: unknown) => finalize() && reject(err);
if (ct.isSupported()) {
const h = ct.register(error);
teardown(() => h.destroy());
}
return { finalize, isClosed, teardown, error };
cin
Movin the observable implementation to the class
 r153 };
cin
WIP observables
 r157 type FusedSink<T> = Omit<Sink<T>, "isClosed">;
export const fuse = <T>(producer: Producer<T>) => (consumer: FusedSink<T>) => {
const reject = (err: unknown) => consumer.error ? consumer.error(err) : errorFallback(err);
const { teardown, isClosed, finalize, error } = subscription(reject);
const next = consumer.next ? consumer.next.bind(consumer) : noop;
teardown(producer({
next: next !== noop ? (v => isClosed() || next(v)) : noop,
error,
complete: () => finalize() && consumer.complete && consumer.complete(),
isClosed
}));
return { unsubscribe: finalize };
};
type FusedProducer<T> = (consumer: FusedSink<T>) => void | (() => void);
cin
Movin the observable implementation to the class
 r153 export class ObservableImpl<T> implements Observable<T> {
cin
WIP observables
 r157 private readonly _producer: FusedProducer<T>;
cin
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 r153
cin
WIP observables
 r157 constructor(producer: FusedProducer<T>) {
cin
Movin the observable implementation to the class
 r153 this._producer = producer;
}
subscribe(consumer: Observer<T> = {}) {
cin
WIP observables
 r157 const reject = (err: unknown) => consumer.error ? consumer.error(err) : errorFallback(err);
const next = consumer.next ? consumer.next.bind(consumer) : noop;
const { teardown, isClosed, finalize, error } = subscription(reject);
cin
bump dependencies, bump ts to 5.2...
 r155
cin
WIP observables
 r157 teardown((0, this._producer)({
next: next !== noop ? (v => isClosed() || next(v)) : noop,
error,
complete: () => finalize() && consumer.complete && consumer.complete()
cin
bump dependencies, bump ts to 5.2...
 r155 }));
return { unsubscribe: finalize };
cin
Movin the observable implementation to the class
 r153 }
map<T2>(mapper: (value: T) => T2) {
return new ObservableImpl<T2>(({ next, ...rest }) =>
this._producer({
next: next !== noop ? (v: T) => next(mapper(v)) : noop,
...rest
}));
}
tap({ next: tapNext, complete: tapComplete, error: tapError }: Observer<T>) {
cin
WIP observables
 r157 return new ObservableImpl<T>(({ next, complete, error }) =>
cin
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 r153 this._producer({
next: tapNext ? (v => (tapNext(v), next(v))) : next,
complete: tapComplete ? (() => (tapComplete(), complete())) : complete,
cin
WIP observables
 r157 error: tapError ? (e => (tapError(e), error(e))) : error
cin
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 r153 }));
}
cin
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 r155 filter(predicate: Predicate<T>) {
return new ObservableImpl<T>(({ next, ...rest }) =>
this._producer({
next: next !== noop ? (v: T) => predicate(v) ? next(v) : void (0) : noop,
...rest
})
);
}
cin
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 r153
cin
bump dependencies, bump ts to 5.2...
 r155 until(predicate: Predicate<T>) {
return new ObservableImpl<T>(({ next, complete, ...rest }) =>
this._producer({
next: v => predicate(v) ? complete() : next(v),
complete,
...rest
})
);
}
cin
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 r153
cin
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 r155 while(predicate: Predicate<T>) {
return new ObservableImpl<T>(({ next, complete, ...rest }) =>
this._producer({
next: v => predicate(v) ? next(v) : complete(),
complete,
...rest
})
);
}
cin
WIP observables
 r157 scan<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>;
scan(accumulator: AccumulatorFn<T, T>): Observable<T>;
cin
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 r155 scan<A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) {
cin
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 r153 if (args.length === 1) {
cin
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 r155 return new ObservableImpl<T | A>(({ next, ...rest }) => {
cin
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 r153 const [accumulator] = args;
let _acc: T;
let index = 0;
cin
bump dependencies, bump ts to 5.2...
 r155 return this._producer({
next: next !== noop ? (v: T) => next(index++ === 0 ? _acc = v : _acc = accumulator(_acc, v)) : noop,
...rest
});
});
} else {
return new ObservableImpl<T | A>(({ next, ...rest }) => {
const [accumulator, initial] = args;
let _acc = initial;
return this._producer({
next: next !== noop ? (v: T) => next(_acc = accumulator(_acc, v)) : noop,
...rest
});
});
}
}
cin
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 r157 reduce<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>;
reduce(accumulator: AccumulatorFn<T, T>): Observable<T>;
cin
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 r155 reduce<A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) {
if (args.length === 1) {
cin
WIP observables
 r157 return new ObservableImpl<T | A>(({ next, complete, error }) => {
cin
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 r155 const [accumulator] = args;
let _acc: T;
let index = 0;
return this._producer({
cin
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 r153 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();
}
},
cin
WIP observables
 r157 error
cin
Movin the observable implementation to the class
 r153 });
cin
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 r155 });
} else {
cin
WIP observables
 r157 return new ObservableImpl<T | A>(({ next, complete, error }) => {
cin
Movin the observable implementation to the class
 r153 const [accumulator, initial] = args;
let _acc = initial;
cin
bump dependencies, bump ts to 5.2...
 r155 return this._producer({
cin
Movin the observable implementation to the class
 r153 next: next !== noop ? (v: T) => {
_acc = accumulator(_acc, v);
} : noop,
complete: () => {
next(_acc);
complete();
},
cin
WIP observables
 r157 error
cin
Movin the observable implementation to the class
 r153 });
cin
bump dependencies, bump ts to 5.2...
 r155 });
}
}
cin
Movin the observable implementation to the class
 r153
cin
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 r155 cat(...seq: Subscribable<T>[]) {
return new ObservableImpl<T>(({ next, complete: final, ...rest }) => {
let cleanup: () => void;
const len = seq.length;
const complete = (i: number) => i < len ?
() => {
const subscription = seq[i].subscribe({ next, complete: complete(i + 1), ...rest });
cleanup = subscription.unsubscribe.bind(subscription);
} : final;
cleanup = this._producer({ next, complete: complete(0), ...rest }) ?? noop;
cin
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 r153
cin
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 r155 return () => cleanup();
});
}
cin
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 r153
cin
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 r155 pipe<U>(op: OperatorFn<T, U>): Observable<U> {
return op(this);
}
cin
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 r153
cin
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 r155 next(ct = Cancellation.none) {
return new Promise<T>((resolve, reject) => {
ct.throwIfRequested();
cin
WIP observables
 r157 const { teardown, finalize, isClosed, error } = subscription(reject, ct);
cin
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 r155 teardown((0, this._producer)({
next: (item: T) => finalize() && resolve(item),
complete: () => finalize() && reject(new Error("The sequence is empty")),
error,
isClosed
}));
});
}
collect(ct = Cancellation.none) {
return new Promise<T[]>((resolve, reject) => {
ct.throwIfRequested();
cin
Movin the observable implementation to the class
 r153
cin
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 r155 const acc: T[] = [];
cin
WIP observables
 r157 const { teardown, finalize, isClosed, error } = subscription(reject, ct);
cin
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 r155 teardown((0, this._producer)({
next: (item: T) => isClosed() ? void (0) : acc.push(item),
complete: () => finalize() && resolve(acc),
error,
isClosed
}));
});
}
cin
WIP observables
 r157 forEach(next: (item: T) => void, ct = Cancellation.none): Promise<void> {
return new Promise<void>((resolve, reject) => {
ct.throwIfRequested();
const { teardown, finalize, isClosed, error } = subscription(reject, ct);
teardown((0, this._producer)({
next: item => !isClosed() && next(item),
complete: () => finalize() && resolve(),
error,
isClosed
}));
});
}
cin
Movin the observable implementation to the class
 r153 }