vendor some callbag utilities for better typings
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src/Utilities/Callbag.ts
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191
src/Utilities/Callbag.ts
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/**
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* The MIT License (MIT)
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*
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* Copyright (c) 2018 André Staltz(staltz.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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import { Callbag, DATA, END, Sink, Source, START } from "callbag";
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// vendoring callbag utilities for now until the typings improve upstream
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export function interval(period: number): Callbag<never, number> {
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return (start: START | DATA | END, data?: Sink<number> | number) => {
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if (start !== 0) return;
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const sink = data as Sink<number>;
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let i = 0;
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const id = setInterval(() => {
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sink(1, i++);
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}, period);
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sink(0, (type: START | DATA | END) => {
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if (type === 2) {
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clearInterval(id);
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}
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});
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};
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}
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export function makeSubject<T>(): Callbag<T, T> {
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const sinks: Sink<T>[] = [];
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return (type: START | DATA | END, data?: Sink<T> | T) => {
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if (type === 0) {
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const sink = data as Sink<T>;
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sinks.push(sink);
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sink(0, (t: START | DATA | END) => {
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if (t === 2) {
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const i = sinks.indexOf(sink);
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if (i > -1) sinks.splice(i, 1);
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}
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});
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} else {
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const zinkz = sinks.slice(0);
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for (let i = 0, n = zinkz.length, sink; i < n; i++) {
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sink = zinkz[i];
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if (sinks.indexOf(sink) > -1) {
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sink(type as 1 & 2, data);
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}
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}
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}
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};
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}
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// modified to never send talkbacks up the chain to avoid confusing subject sources by mistake
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export function merge<T>(...sources: Callbag<never, T>[]): Source<T> {
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return (start: START | DATA | END, data?: Callbag<T, void> | void) => {
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if (start !== 0) return;
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const sink = data as Callbag<T, void>;
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const n = sources.length;
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const sourceTalkbacks: (Sink<never> | undefined)[] = new Array(n);
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let startCount = 0;
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let endCount = 0;
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let ended = false;
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const talkback = (t: START | DATA | END, d?: Callbag<T, void> | void) => {
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if (t === 2) ended = true;
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//for (let i = 0; i < n; i++) sourceTalkbacks[i]?.(t as 0 & 1 & 2, d);
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};
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for (let i = 0; i < n; i++) {
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if (ended) return;
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sources[i](0, (t: START | DATA | END, d?: Callbag<never, T> | T) => {
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if (t === 0) {
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sourceTalkbacks[i] = d as Callbag<never, T>;
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if (++startCount === 1) sink(0, talkback);
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} else if (t === 2 && d) {
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ended = true;
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for (let j = 0; j < n; j++) {
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if (j !== i) sourceTalkbacks[j]?.(2);
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}
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sink(2, d);
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} else if (t === 2) {
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sourceTalkbacks[i] = void 0;
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if (++endCount === n) sink(2);
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} else {
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sink(t as 0 & 1 & 2, d);
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}
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});
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}
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};
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}
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export function lazy<T, TB>(f: () => T): Callbag<TB, T> {
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return (start: START | DATA | END, data?: Callbag<T, TB> | TB) => {
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if (start === 0) {
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const sink = data as Callbag<T, TB>;
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let unsubed = false;
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sink(0, (type: START | DATA | END) => {
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if (type === 2) unsubed = true;
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});
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sink(1, f());
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if (!unsubed) sink(2);
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}
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};
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}
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// callbag-flatten, but pulling sources has been disabled in favor of passing talkback signals to the current source
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export function flattenLatest<T, TB>(source: Callbag<TB, Callbag<TB, T>>): Callbag<TB, T> {
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return (start: START | DATA | END, data?: Callbag<T, TB> | TB) => {
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if (start !== 0) return;
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const sink = data as Callbag<T, TB>;
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let outerEnded = false;
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let outerTalkback: Callbag<TB, T>;
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let innerTalkback: Callbag<TB, T> | undefined;
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function talkback(t: START | DATA | END, d?: Callbag<T, TB> | TB) {
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if (t === 1) {
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//(innerTalkback || outerTalkback)(1, d as TB);
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innerTalkback?.(1, d as TB);
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}
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if (t === 2) {
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innerTalkback?.(2);
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innerTalkback = void 0;
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outerTalkback(2);
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}
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}
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source(0, (T: START | DATA | END, D?: Callbag<TB, Callbag<TB, T>> | Callbag<TB, T>) => {
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if (T === 0) {
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outerTalkback = D as Callbag<TB, Callbag<TB, T>>;
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sink(0, talkback);
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} else if (T === 1) {
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const innerSource = D as Callbag<TB, T>;
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innerTalkback?.(2);
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innerTalkback = void 0;
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innerSource(0, (t: START | DATA | END, d?: Callbag<TB, T> | T) => {
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if (t === 0) {
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innerTalkback = d as Callbag<TB, T>;
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//innerTalkback(1);
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} else if (t === 1) {
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sink(1, d as T);
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}
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else if (t === 2 && d) {
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outerTalkback(2);
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sink(2, d);
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} else if (t === 2) {
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if (outerEnded) {
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sink(2);
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}
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else {
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innerTalkback = void 0;
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//outerTalkback(1);
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}
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}
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});
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} else if (T === 2 && D) {
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innerTalkback?.(2);
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innerTalkback = void 0;
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sink(2, D);
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} else if (T === 2) {
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if (!innerTalkback) sink(2);
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else outerEnded = true;
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}
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});
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};
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}
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export function defer<T, TB>(factory: () => Callbag<TB, T>): Callbag<TB, T> {
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return flattenLatest(lazy(factory));
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};
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export function map<I, O, TB>(f: (input: I) => O): (source: Callbag<TB, I>) => Callbag<TB, O> {
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return source => (start: START | DATA | END, sink?: Callbag<O, TB> | TB) => {
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if (start !== 0) return;
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source(0, (t: START | DATA | END, d?: Callbag<TB, I> | I) => {
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(sink as Callbag<O, TB>)(t as 0 & 1 & 2, t === 1 ? f(d as I) : d)
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});
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};
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}
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