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import { context } from "../context";
import { type EventObject, on, type RemoveListener, send, size } from "../event";
import { type ReadableProvider, type OwnedWritable, type Readable } from "../interface";
import { writable } from "../readable";
import { onDisposeValue, type OnDisposeValue } from "./utils";
export interface ReactiveSetChanged<V> {
readonly upsert: readonly V[];
readonly delete: readonly V[];
}
interface OnChanged<V> extends BatchTask<EventObject<ReactiveSetChanged<V>>> {
readonly upsert_: Set<V>;
readonly delete_: Set<V>;
}
/**
* OwnedReactiveSet extends the standard Set interface with reactive capabilities.
*
* @category ReactiveSet
*/
export class OwnedReactiveSet<V> extends Set<V> implements ReadableProvider<ReadonlyReactiveSet<V>> {
/**
* A Readable that emits the Set itself whenever it changes.
*
* @group Readable
*/
public get $(): Readable<ReadonlyReactiveSet<V>> {
return (this._$ ??= writable(this, { equal: false }));
}
/**
* Subscribe to changes in the set.
*
* @group Events
* @param fn - The function to call when the set is changed.
* @returns A disposer function to unsubscribe from the event.
*
* @example
* ```ts
* import { reactiveSet } from "@embra/reactivity";
*
* const set = reactiveSet<number>();
* const disposer = set.onChanged((changed) => {
* console.log("Set changed:", changed);
* });
* ```
*/
public onChanged(fn: (changed: ReactiveSetChanged<V>) => void): RemoveListener {
return on(
(this._onChanged_ ??= {
delete_: new Set<V>(),
upsert_: new Set<V>(),
batchTask_: () => {
if (this._onChanged_ && size(this._onChanged_)) {
const { upsert_, delete_ } = this._onChanged_;
/** c8 ignore else -- @preserve */
if (upsert_.size > 0 || delete_.size > 0) {
const changedData = {
upsert: [...upsert_],
delete: [...delete_],
};
upsert_.clear();
delete_.clear();
send(this._onChanged_, changedData);
}
} else {
this._onChanged_ = null;
}
},
}),
fn,
);
}
/**
* Subscribe to events when a value is needed to be disposed.
*
* A value is considered for disposal when:
* - it is deleted from the set.
* - it is replaced by another value (the old value is removed).
* - it is cleared from the set.
* - the set is disposed.
*
* @function
* @group Events
* @param fn - The function to call when a value is needed to be disposed.
* @returns A disposer function to unsubscribe from the event.
*
* @example
* ```ts
* import { reactiveSet } from "@embra/reactivity";
*
* const set = reactiveSet<number>();
* const disposer = set.onDisposeValue((value) => {
* console.log("Value disposed:", value);
* });
* ```
*/
public readonly onDisposeValue = onDisposeValue;
public constructor(values?: Iterable<V> | null) {
super();
if (values) {
for (const value of values) {
super.add(value);
}
}
}
public dispose(): void {
if (this._disposed_) return;
if (process.env.NODE_ENV !== "production") {
this._disposed_ = new Error("[embra] ReactiveSet 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();
batchTasks.add(this.onDisposeValue_);
isBatchTop && batchFlush();
}
}
this._$ = this._onChanged_ = this.onDisposeValue_ = null;
}
public override add(value: V): this {
if (!this.has(value)) {
const isBatchTop = batchStart();
this.onDisposeValue_?.delete_.delete(value);
if (this._onChanged_) {
this._onChanged_.upsert_.add(value);
this._onChanged_.delete_.delete(value);
batchTasks.add(this._onChanged_);
}
super.add(value);
this._notify_();
isBatchTop && batchFlush();
}
return this;
}
public override delete(value: V): boolean {
if (this.has(value)) {
const isBatchTop = batchStart();
if (this.onDisposeValue_) {
this.onDisposeValue_.delete_.add(value);
batchTasks.add(this.onDisposeValue_);
}
if (this._onChanged_) {
this._onChanged_.delete_.add(value);
this._onChanged_.upsert_.delete(value);
batchTasks.add(this._onChanged_);
}
this._notify_();
isBatchTop && batchFlush();
}
return super.delete(value);
}
public override clear(): void {
if (this.size) {
const isBatchTop = batchStart();
if (this.onDisposeValue_) {
for (const value of this) {
this.onDisposeValue_.delete_.add(value);
batchTasks.add(this.onDisposeValue_);
}
}
if (this._onChanged_) {
for (const value of this) {
this._onChanged_.delete_.add(value);
this._onChanged_.upsert_.delete(value);
batchTasks.add(this._onChanged_);
}
}
super.clear();
this._notify_();
isBatchTop && batchFlush();
}
}
/**
* Replace the contents of the set with the given values.
* @param values - The new values to replace the set with.
* @returns The set itself.
*/
public replace(values: Iterable<V>): this {
const isBatchTop = batchStart();
const newValues: Set<V> = (context.replaceMarkers_ ??= new Set());
for (const value of values) {
newValues.add(value);
this.add(value);
}
for (const value of this) {
if (!newValues.has(value)) {
this.delete(value);
}
}
newValues.clear();
isBatchTop && batchFlush();
return this;
}
/** @internal */
private _disposed_?: Error | true;
/** @internal */
private _$?: OwnedWritable<this> | null;
/** @internal */
private _onChanged_?: null | OnChanged<V>;
/** @internal */
public onDisposeValue_?: null | OnDisposeValue<V>;
/** @internal */
private _notify_() {
if (this._disposed_) {
console.error(this, new Error("disposed"));
if (process.env.NODE_ENV !== "production") {
console.error(this._disposed_);
}
}
this._$?.set(this);
}
}
/**
* ReactiveSet is {@link OwnedReactiveSet} without the `dispose` method.
*
* @category ReactiveSet
*/
export type ReactiveSet<V> = Omit<OwnedReactiveSet<V>, "dispose">;
/**
* ReadonlyReactiveSet is a readonly interface for {@link ReactiveSet}.
*
* @category ReactiveSet
*/
export interface ReadonlyReactiveSet<V> extends ReadonlySet<V> {
/**
* A Readable that emits the Set itself whenever it changes.
*
* @group Readable
*/
readonly $: Readable<ReadonlySet<V>>;
/**
* Subscribe to changes in the set.
*
* @group Events
* @param fn - The function to call when the set is changed.
* @returns A disposer function to unsubscribe from the event.
*
* @example
* ```ts
* import { reactiveSet } from "@embra/reactivity";
*
* const set = reactiveSet<number>();
* const disposer = set.onChanged((changed) => {
* console.log("Set changed:", changed);
* });
* ```
*/
onChanged(fn: (changed: ReactiveSetChanged<V>) => void): RemoveListener;
/**
* Subscribe to events when a value is needed to be disposed.
*
* A value is considered for disposal when:
* - it is deleted from the set.
* - it is replaced by another value (the old value is removed).
* - it is cleared from the set.
* - the set is disposed.
*
* @function
* @group Events
* @param fn - The function to call when a value is needed to be disposed.
* @returns A disposer function to unsubscribe from the event.
*
* @example
* ```ts
* import { reactiveSet } from "@embra/reactivity";
*
* const set = reactiveSet<number>();
* const disposer = set.onDisposeValue((value) => {
* console.log("Value disposed:", value);
* });
* ```
*/
readonly onDisposeValue: (fn: (value: V) => void) => RemoveListener;
}
/**
* Creates a new {@link OwnedReactiveSet}.
*
* @category ReactiveSet
* @param values - Initial values for the reactive set.
* @returns A new instance of {@link OwnedReactiveSet}.
*
* @example
* ```ts
* import { reactiveSet } from "@embra/reactivity";
*
* const set$ = reactiveSet([1, 2, 3]);
* ```
*/
export const reactiveSet = <V>(values?: Iterable<V> | null): OwnedReactiveSet<V> => new OwnedReactiveSet(values);
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