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x/evt/lib/Evt.from.ts

💧EventEmitter's typesafe replacement
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import { id } from "https://deno.land/x/tsafe@v1.4.1/id.ts";import { assert } from "https://deno.land/x/tsafe@v1.4.1/assert.ts";;import { typeGuard } from "https://deno.land/x/tsafe@v1.4.1/typeGuard.ts";import { mergeImpl } from "./Evt.merge.ts";import { importProxy } from "./importProxy.ts";import type { dom, Evt, NonPostableEvtLike } from "./types/index.ts";import type { EventTargetLike } from "./types/index.ts";import * as nsEventTargetLike from "./types/EventTargetLike.ts";const { EventTargetLike: EventTargetLikeAsValue } = nsEventTargetLike;import type { ObserverConstructor } from "./types/Observer.ts";
type OneOrMany<T> = T | ArrayLike<T>;type CtxLike<Result> = import("./types/index.ts").CtxLike<Result> & { evtDoneOrAborted: NonPostableEvtLike<unknown> & { postCount: number; attachOnce(callback: () => void): void; };};
function fromImplForTargetEventLike<T>( ctx: CtxLike<any> | undefined, target: OneOrMany<EventTargetLike<T>> | PromiseLike<T>, eventName?: string, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<T> {
const matchEventTargetLike = (target_: typeof target): target_ is EventTargetLike<T> => EventTargetLikeAsValue.canBe(target_);
if (!matchEventTargetLike(target)) {
if ("then" in target) {
const evt = new importProxy.Evt<T>();
const isCtxDone = (() => {
const getEvtDonePostCount = () => ctx?.evtDoneOrAborted.postCount;
const n = getEvtDonePostCount();
return () => n !== getEvtDonePostCount();
})();
target.then(data => {
if (isCtxDone()) { return; }
evt.post(data);
});
return evt;
}
return mergeImpl<Evt<T>>( ctx, Array.from(target).map( target => fromImplForTargetEventLike<T>(ctx, target, eventName, options) ) );
}
type ProxyMethod<T> = ( listener: (data: T) => void, eventName: string, options?: EventTargetLike.HasEventTargetAddRemove.Options ) => void;
let proxy: { on: ProxyMethod<T>; off: ProxyMethod<T>; };
if (EventTargetLikeAsValue.HasEventTargetAddRemove.match(target)) { proxy = { "on": (listener, eventName, options) => target.addEventListener(eventName, listener, options), "off": (listener, eventName, options) => target.removeEventListener(eventName, listener, options) }; } else if (EventTargetLikeAsValue.NodeStyleEventEmitter.match(target)) { proxy = { "on": (listener, eventName) => target.addListener(eventName, listener), "off": (listener, eventName) => target.removeListener(eventName, listener) }; } else if (EventTargetLikeAsValue.JQueryStyleEventEmitter.match(target)) { proxy = { "on": (listener, eventName) => target.on(eventName, listener), "off": (listener, eventName) => target.off(eventName, listener) }; } else if (EventTargetLikeAsValue.RxJSSubject.match(target)) {
let subscription: EventTargetLike.RxJSSubject.Subscription;
proxy = { "on": listener => subscription = target.subscribe(data => listener(data)), "off": () => subscription.unsubscribe() };
} else {
id<never>(target); assert(false);
}
const evt = new importProxy.Evt<T>();
const listener = (data: T) => evt.post(data);
ctx?.evtDoneOrAborted.attachOnce( () => proxy.off( listener, eventName!, options ) );
proxy.on(listener, eventName!, options);
return evt;
}
function fromImplForObserver<Target, Entry>( ctx: CtxLike<any> | undefined, ObserverConstructor: ObserverConstructor<Target, Entry>, target: Target): Evt<Entry> {
const evt = importProxy.Evt.create<Entry>();
const listener = ([entry]: Entry[]) => evt.post(entry);
const observer = new ObserverConstructor(listener);
observer.observe(target);
ctx?.evtDoneOrAborted.attachOnce( () => observer.disconnect() );
return evt;
}
/** https://docs.evt.land/api/evt/from */export function from<K extends keyof dom.HTMLElementEventMap>( ctx: CtxLike<any>, target: EventTargetLike.HTMLElement, eventName: K, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<dom.HTMLElementEventMap[K]>;
export function from<K extends keyof dom.WindowEventMap>( ctx: CtxLike<any>, target: EventTargetLike.Window, eventName: K, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<dom.WindowEventMap[K]>;
export function from<K extends keyof dom.DocumentEventMap>( ctx: CtxLike<any>, target: EventTargetLike.Document, eventName: K, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<dom.DocumentEventMap[K]>;
export function from<T>( ctx: CtxLike<any>, target: OneOrMany< EventTargetLike.NodeStyleEventEmitter | EventTargetLike.JQueryStyleEventEmitter >, eventName: string): Evt<T>;export function from<T>( ctx: CtxLike<any>, target: OneOrMany< EventTargetLike.HasEventTargetAddRemove<T> >, eventName: string, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<T>;export function from<T>( ctx: CtxLike<any>, target: OneOrMany<EventTargetLike.RxJSSubject<T>>): Evt<T>;
export function from<T>( ctx: CtxLike<any>, target: PromiseLike<T>): Evt<T>;
export function from<Target, Entry>( ctx: CtxLike<any>, ObserverConstructor: ObserverConstructor<Target, Entry>, target: Target): Evt<Entry>;

export function from<K extends keyof dom.HTMLElementEventMap>( target: EventTargetLike.HTMLElement, eventName: K, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<dom.HTMLElementEventMap[K]>;export function from<K extends keyof dom.WindowEventMap>( target: EventTargetLike.Window, eventName: K, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<dom.WindowEventMap[K]>;export function from<K extends keyof dom.DocumentEventMap>( target: EventTargetLike.Document, eventName: K, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<dom.DocumentEventMap[K]>;export function from<T>( target: OneOrMany< EventTargetLike.NodeStyleEventEmitter | EventTargetLike.JQueryStyleEventEmitter >, eventName: string): Evt<T>;export function from<T>( target: OneOrMany< EventTargetLike.HasEventTargetAddRemove<T> >, eventName: string, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<T>;export function from<T>( target: OneOrMany<EventTargetLike.RxJSSubject<T>>): Evt<T>;export function from<T>( target: PromiseLike<T>): Evt<T>;
export function from<Target, Entry>( ObserverConstructor: ObserverConstructor<Target, Entry>, target: Target): Evt<Entry>;/*/^[A-Z]/.test(targetOrEventNameOrObserverConstructorOrObserverTarget.name */
export function from<T, ObserverTarget = never>( ctxOrTargetOrObserverConstructor: CtxLike<any> | OneOrMany<EventTargetLike<T>> | PromiseLike<T> | ObserverConstructor<ObserverTarget, T>, targetOrEventNameOrObserverConstructorOrObserverTarget?: OneOrMany<EventTargetLike<T>> | string | PromiseLike<T> | ObserverConstructor<ObserverTarget, T> | ObserverTarget, eventNameOrOptionsOrObserverTarget?: string | EventTargetLike.HasEventTargetAddRemove.Options | ObserverTarget, options?: EventTargetLike.HasEventTargetAddRemove.Options): Evt<T> {
if ("evtDoneOrAborted" in ctxOrTargetOrObserverConstructor) {
assert( typeGuard<OneOrMany<EventTargetLike<T>> | PromiseLike<T> | ObserverConstructor<ObserverTarget, T>>(targetOrEventNameOrObserverConstructorOrObserverTarget, true) && typeGuard<string | undefined | ObserverTarget>(eventNameOrOptionsOrObserverTarget, true) && typeGuard<EventTargetLike.HasEventTargetAddRemove.Options | undefined>(options, true) );
if (typeof targetOrEventNameOrObserverConstructorOrObserverTarget === "function") {
assert( typeGuard<ObserverTarget>(eventNameOrOptionsOrObserverTarget, true) && typeGuard<undefined>(options, true) );
return fromImplForObserver( ctxOrTargetOrObserverConstructor, targetOrEventNameOrObserverConstructorOrObserverTarget, eventNameOrOptionsOrObserverTarget );
} else {
assert( typeGuard<Exclude<typeof eventNameOrOptionsOrObserverTarget, ObserverTarget>>(eventNameOrOptionsOrObserverTarget, true) );
return fromImplForTargetEventLike( ctxOrTargetOrObserverConstructor, targetOrEventNameOrObserverConstructorOrObserverTarget, eventNameOrOptionsOrObserverTarget, options );
}

} else {
assert( typeGuard<Exclude<typeof ctxOrTargetOrObserverConstructor, CtxLike<any>>>(ctxOrTargetOrObserverConstructor, true) && typeGuard<string | undefined | ObserverTarget>(targetOrEventNameOrObserverConstructorOrObserverTarget, true) && typeGuard<EventTargetLike.HasEventTargetAddRemove.Options | undefined>(eventNameOrOptionsOrObserverTarget, true) );
if (typeof ctxOrTargetOrObserverConstructor === "function") {
assert( typeGuard<ObserverTarget>(targetOrEventNameOrObserverConstructorOrObserverTarget, true) && typeGuard<undefined>(eventNameOrOptionsOrObserverTarget, true) );
return fromImplForObserver( undefined, ctxOrTargetOrObserverConstructor, targetOrEventNameOrObserverConstructorOrObserverTarget );

} else {
assert( typeGuard<Exclude<typeof targetOrEventNameOrObserverConstructorOrObserverTarget, ObserverTarget>>( targetOrEventNameOrObserverConstructorOrObserverTarget, true ) );
return fromImplForTargetEventLike( undefined, ctxOrTargetOrObserverConstructor, targetOrEventNameOrObserverConstructorOrObserverTarget, eventNameOrOptionsOrObserverTarget );
}


}
}