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import { type RemoveListener } from "../event";
import { writable } from "../readable";
import { type ReadableProvider, type OwnedWritable, type Readable } from "../typings";
import { strictEqual } from "../utils";
import { onDisposeValue, type OnDisposeValue } from "./utils";
const nonEnumerable = { enumerable: false };
export class OwnedReactiveArray<V> extends Array<V> implements ReadableProvider<ReadonlyReactiveArray<V>> {
readonly [n: number]: V;
/**
* Gets the length of the array.
* This is a number one higher than the highest index in the array.
*
* Use `.setLength(length)` to change the length of the array.
*/
declare public readonly length: number;
/**
* A Readable that emits the set itself whenever it changes.
*/
public get $(): Readable<ReadonlyReactiveArray<V>> {
return (this._$ ??= writable(this, { equal: false }));
}
/**
* Subscribe to events when a value is needed to be disposed.
*
* A value is considered for disposal when:
* - it is deleted from the array.
* - it is replaced by another value (the old value is removed).
* - it is cleared from the array.
* - the array is disposed.
*
* @param fn - The function to call when a value is needed to be disposed.
* @returns A disposer function to unsubscribe from the event.
*/
public readonly onDisposeValue = onDisposeValue;
public constructor(arrayLength?: number);
public constructor(arrayLength: number);
public constructor(...items: V[]);
public constructor(...args: V[]) {
super(...args);
Object.defineProperties(this, {
onDisposeValue: nonEnumerable,
onDisposeValue_: nonEnumerable,
set: { ...nonEnumerable, value: this.set },
_$: nonEnumerable,
_disposed_: nonEnumerable,
});
}
/**
* Overwrites the value at the provided index with the given value.
* If the index is negative, then it replaces from the end of the array.
* @param index The index of the value to overwrite. If the index is
* negative, then it replaces from the end of the array.
* @param value The value to write into the array.
*/
public set(index: number, value: V): this {
index = Number(index);
index = index < 0 ? this.length + index : index;
if (index >= 0 && Number.isFinite(index) && !strictEqual(this[index], value)) {
(this as any)[index] = value;
this._notify_();
}
return this;
}
public setLength(value: number): void {
if (value >= 0 && value !== this.length) {
super.length = value;
this._notify_();
}
}
public override fill(value: V, start?: number, end?: number): this {
if (this.length > 0) {
super.fill(value, start, end);
this._notify_();
}
return this;
}
public override push(...items: V[]): number {
const length = super.push(...items);
items.length > 0 && this._notify_();
return length;
}
public override pop(): V | undefined {
if (this.length > 0) {
const value = super.pop();
this._notify_();
return value;
}
}
public override shift(): V | undefined {
if (this.length > 0) {
const value = super.shift();
this._notify_();
return value;
}
}
public override unshift(...items: V[]): number {
const length = super.unshift(...items);
items.length > 0 && this._notify_();
return length;
}
public override splice(start: number, deleteCount?: number): V[];
public override splice(start: number, deleteCount: number, ...items: V[]): V[];
public override splice(...args: [number, number, ...V[]]): V[] {
const removed = super.splice(...args);
if (removed.length > 0 || args.length > 2) {
this._notify_();
}
return removed;
}
public override reverse(): this {
if (this.length > 1) {
super.reverse();
this._notify_();
}
return this;
}
public override sort(compareFn?: (a: V, b: V) => number): this {
if (this.length > 1) {
super.sort(compareFn);
this._notify_();
}
return this;
}
public override copyWithin(target: number, start: number, end?: number): this {
if (this.length > 0) {
super.copyWithin(target, start, end);
this._notify_();
}
return this;
}
public dispose(): void {
if (this._disposed_) return;
if (process.env.NODE_ENV !== "production") {
this._disposed_ = new Error("[embra] ReactiveArray disposed at:");
} else {
this._disposed_ = true;
}
if (this.onDisposeValue_) {
const { delete_ } = this.onDisposeValue_;
for (const value of this.values()) {
delete_.add(value);
}
if (delete_.size) {
const isBatchTop = batchStart();
tasks.add(this.onDisposeValue_!);
isBatchTop && batchFlush();
}
}
this._$ = this.onDisposeValue_ = null;
}
/** @internal */
private _disposed_?: Error | true;
/** @internal */
private _$?: OwnedWritable<this> | null;
/** @internal */
public onDisposeValue_?: null | OnDisposeValue<V>;
/** @internal */
private _notify_() {
if (this._disposed_) {
console.error(new Error("disposed"));
if (process.env.NODE_ENV !== "production") {
console.error(this._disposed_);
}
}
this._$?.set(this);
}
}
export type ReactiveArray<V> = Omit<OwnedReactiveArray<V>, "dispose">;
export interface ReadonlyReactiveArray<V> extends ReadonlyArray<V> {
readonly $: Readable<readonly V[]>;
/**
* Gets the length of the array.
* This is a number one higher than the highest index in the array.
*
* Use `.setLength(length)` to change the length of the array.
*/
readonly length: number;
/**
* Overwrites the value at the provided index with the given value.
* If the index is negative, then it replaces from the end of the array.
* @param index The index of the value to overwrite. If the index is
* negative, then it replaces from the end of the array.
* @param value The value to write into the array.
*/
set(index: number, value: V): this;
setLength(value: number): void;
/**
* Subscribe to events when a value is needed to be disposed.
*
* A value is considered for disposal when:
* - it is deleted from the array.
* - it is replaced by another value (the old value is removed).
* - it is cleared from the array.
* - the array is disposed.
*
* @param fn - The function to call when a value is needed to be disposed.
* @returns A disposer function to unsubscribe from the event.
*/
onDisposeValue(fn: (value: V) => void): RemoveListener;
}
export const reactiveArray = <V>(values?: Iterable<V> | null): OwnedReactiveArray<V> => {
const arr = new OwnedReactiveArray<V>();
if (values) {
arr.push(...values);
}
return arr;
};
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