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added reduce() and next() methods to observable...
added reduce() and next() methods to observable query traits are moved to store.ts
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r116:aac297dda27d v1.6.0 default
r116:aac297dda27d v1.6.0 default
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observable.ts
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/ djx / src / main / ts / observable.ts
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cin
added reduce() and next() methods to observable...
 r116 import { Cancellation } from "@implab/core-amd/Cancellation";
import { ICancellation } from "@implab/core-amd/interfaces";
cin
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 r110
cin
`Subscribable` is made compatible with rxjs, added map, filter and scan...
 r102 /**
* The interface for the consumer of an observable sequence
*/
export interface Observer<T> {
/**
* Called for the next element in the sequence
*/
next: (value: T) => void;
cin
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cin
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 r102 /**
* Called once when the error occurs in the sequence.
*/
cin
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 r96 error: (e: unknown) => void;
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 r102
/**
* Called once at the end of the sequence.
*/
cin
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 r96 complete: () => void;
}
cin
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 r102 /**
cin
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 r110 * The group of functions to feed an observable. These methods are provided to
cin
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 r102 * the producer to generate a stream of events.
*/
export type Sink<T> = {
cin
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 r110 /**
* Call to send the next element in the sequence
*/
cin
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 r116 next: (value: T) => void;
/**
* Call to notify about the error occurred in the sequence.
*/
error: (e: unknown) => void;
cin
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 r110
cin
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 r116 /**
* Call to signal the end of the sequence.
*/
complete: () => void;
cin
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cin
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 r116 /**
* Checks whether the sink is accepting new elements. It's safe to
* send elements to the closed sink.
*/
isClosed: () => boolean;
cin
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 r102 };
cin
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export type Producer<T> = (sink: Sink<T>) => (void | (() => void));
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 r102 export interface Unsubscribable {
unsubscribe(): void;
}
export const isUnsubsribable = (v: unknown): v is Unsubscribable =>
v !== null && v !== undefined && typeof (v as Unsubscribable).unsubscribe === "function";
cin
Working on WatchForRendition
 r107 export const isSubsribable = <T = unknown>(v: unknown): v is Subscribable<T> =>
cin
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 r102 v !== null && v !== undefined && typeof (v as Subscribable<unknown>).subscribe === "function";
cin
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cin
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 r102 export interface Subscribable<T> {
subscribe(consumer: Partial<Observer<T>>): Unsubscribable;
}
cin
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 r116 export type AccumulatorFn<T, A> = (acc: A, value: T) => A;
cin
`Subscribable` is made compatible with rxjs, added map, filter and scan...
 r102 /** The observable source of items. */
export interface Observable<T> extends Subscribable<T> {
/** Transforms elements of the sequence with the specified mapper
*
* @param mapper The mapper used to transform the values
*/
map<T2>(mapper: (value: T) => T2): Observable<T2>;
cin
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cin
`Subscribable` is made compatible with rxjs, added map, filter and scan...
 r102 /** Filters elements of the sequence. The resulting sequence will
* contain only elements which match the specified predicate.
*
* @param predicate The filter predicate.
*/
filter(predicate: (value: T) => boolean): Observable<T>;
cin
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cin
`Subscribable` is made compatible with rxjs, added map, filter and scan...
 r102 /** Applies accumulator to each value in the sequence and
* emits the accumulated value for each source element
*
* @param accumulator
* @param initial
*/
cin
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 r116 scan<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>;
scan(accumulator: AccumulatorFn<T, T>): Observable<T>;
cin
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 r110
cin
added reduce() and next() methods to observable...
 r116 /** Applies accumulator to each value in the sequence and
* emits the accumulated value at the end of the sequence
*
* @param accumulator
* @param initial
*/
reduce<A>(accumulator: AccumulatorFn<T, A>, initial: A): Observable<A>;
reduce(accumulator: AccumulatorFn<T, T>): Observable<T>;
/** Concatenates the specified sequences with this observable
*
* @param seq sequences to concatenate with the current observable
*/
cin
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 r110 cat(...seq: Subscribable<T>[]): Observable<T>;
cin
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 r114
cin
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 r116 /** Pipes the specified operator to produce the new observable
* @param op The operator which consumes this observable and produces a new one
*/
pipe<U>(op: (source: Observable<T>) => Producer<U>): Observable<U>;
/** Waits for the next event to occur and returns a promise for the next value
* @param ct Cancellation token to
*/
next(ct?: ICancellation): Promise<T>;
cin
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 r102 }
const noop = () => { };
const sink = <T>(consumer: Partial<Observer<T>>) => {
const { next, error, complete } = consumer;
cin
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 r96 return {
cin
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 r102 next: next ? next.bind(consumer) : noop,
error: error ? error.bind(consumer) : noop,
cin
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 r110 complete: complete ? complete.bind(consumer) : noop,
isClosed: () => false
cin
linting
 r109 };
cin
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 r102 };
cin
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 r110 /** Wraps the producer to handle tear down logic and subscription management
*
* @param producer The producer to wrap
* @returns The wrapper producer
*/
const fuse = <T>(producer: Producer<T>) => ({ next, error, complete }: Sink<T>) => {
cin
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 r102 let done = false;
cin
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 r110 let cleanup = noop;
const _fin = <A extends unknown[]>(fn: (...args: A) => void) =>
(...args: A) => done ?
void (0) :
(done = true, cleanup(), fn(...args));
const safeSink = {
cin
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 r109 next: (value: T) => { !done && next(value); },
cin
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 r110 error: _fin(error),
complete: _fin(complete),
isClosed: () => done
cin
linting
 r109 };
cin
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 r110 cleanup = producer(safeSink) ?? noop;
return done ?
(cleanup(), noop) :
_fin(noop);
cin
linting
 r109 };
cin
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 r96
cin
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 r102 const _observe = <T>(producer: Producer<T>): Observable<T> => ({
subscribe: (consumer: Partial<Observer<T>>) => ({
unsubscribe: producer(sink(consumer)) ?? noop
}),
cin
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 r116
cin
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 r110 map: (mapper) => _observe(({ next, ...rest }) =>
cin
`Subscribable` is made compatible with rxjs, added map, filter and scan...
 r102 producer({
next: next !== noop ? (v: T) => next(mapper(v)) : noop,
cin
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 r110 ...rest
})
),
cin
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 r116
cin
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 r110 filter: (predicate) => _observe(({ next, ...rest }) =>
producer({
next: next !== noop ? (v: T) => predicate(v) ? next(v) : void (0) : noop,
...rest
cin
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 r102 })
),
cin
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scan: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, ...rest }) => {
if (args.length === 1) {
const [accumulator] = args;
let _acc: T;
let index = 0;
return producer({
next: next !== noop ? (v: T) => next(index++ === 0 ? _acc = v : _acc = accumulator(_acc, v)) : noop,
...rest
});
} else {
const [accumulator, initial] = args;
let _acc = initial;
return producer({
next: next !== noop ? (v: T) => next(_acc = accumulator(_acc, v)) : noop,
...rest
});
}
}),
reduce: <A>(...args: [AccumulatorFn<T, A>, A] | [AccumulatorFn<T, T>]) => _observe<T | A>(({ next, complete, error, ...rest }) => {
if (args.length === 1) {
const [accumulator] = args;
let _acc: T;
let index = 0;
return 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,
...rest
});
} else {
const [accumulator, initial] = args;
let _acc = initial;
return producer({
next: next !== noop ? (v: T) => {
_acc = accumulator(_acc, v);
} : noop,
complete: () => {
next(_acc);
complete();
},
error,
...rest
});
}
cin
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 r110 }),
cat: (...seq) => _observe(({ next, complete: final, ...rest }) => {
let cleanup: () => void;
const complete = () => {
const continuation = seq.shift();
if (continuation) {
// if we have a next sequence, subscribe to it
const subscription = continuation.subscribe({ next, complete, ...rest });
cleanup = subscription.unsubscribe.bind(subscription);
} else {
// otherwise notify the consumer about completion
final();
}
};
cleanup = producer({ next, complete, ...rest }) ?? noop;
return () => cleanup();
cin
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 r114 }),
cin
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 r116 pipe: <U>(op: (source: Observable<T>) => Producer<U>) => observe(op(_observe(producer))),
cin
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 r110
cin
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 r116 next: (ct?: ICancellation) => {
const _ct = ct ?? Cancellation.none;
return new Promise<T>((resolve, reject) => {
// wrap the producer to handle only single event
const once = fuse<T>(({ next, complete, error, isClosed }) => {
const h = _ct.register(error);
cin
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 r110
cin
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 r116 // is the _ct fires it will call error() and isClosed() will return true
const cleanup = !isClosed() ?
producer({
next: v => (next(v), complete()),
complete: () => error(new Error("The sequence is empty")),
error,
isClosed
}) ?? noop :
noop;
cin
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cin
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 r116 return () => {
h.destroy();
cleanup();
};
});
cin
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cin
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 r116 once({
next: resolve,
error: reject,
complete: noop,
isClosed: () => false
});
});
}
});
cin
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 r110
export const observe = <T>(producer: Producer<T>) => _observe(fuse(producer));
cin
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 r116 export const streamArray = <T>(items: T[]) => _observe<T>(
({ next, complete }) => (
items.forEach(next),
complete()
)
);
cin
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 r110
cin
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 r116 export const streamPromise = <T>(promise: PromiseLike<T>) => observe<T>(
({next, error, complete}) => void promise.then(v => (next(v), complete()), error)
);
cin
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 r110
cin
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 r116 export const of = <T>(...items: T[]) => _observe<T>(
({ next, complete }) => (
items.forEach(next),
complete()
)
);
cin
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 r110
cin
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 r116 export const empty = _observe<never>(({ complete }) => complete());