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* Copyright (c) OpenLens Authors. All rights reserved.
* Licensed under MIT License. See LICENSE in root directory for more information.
*/
import type { IInterceptable, IInterceptor, IListenable, ISetWillChange, ObservableMap } from "mobx";
import { observable, ObservableSet, runInAction } from "mobx";
export function makeIterableIterator<T>(iterator: Iterator<T>): IterableIterator<T> {
(iterator as IterableIterator<T>)[Symbol.iterator] = () => iterator as IterableIterator<T>;
return iterator as IterableIterator<T>;
}
export class HashSet<T> implements Set<T> {
#hashmap: Map<string, T>;
constructor(initialValues: Iterable<T>, protected hasher: (item: T) => string) {
this.#hashmap = new Map<string, T>(Array.from(initialValues, value => [this.hasher(value), value]));
}
replace(other: ObservableHashSet<T> | ObservableSet<T> | Set<T> | readonly T[]): this {
if (other === null || other === undefined) {
return this;
}
if (!(Array.isArray(other) || other instanceof Set || other instanceof ObservableHashSet || other instanceof ObservableSet)) {
throw new Error(`ObservableHashSet: Cannot initialize set from ${other}`);
}
this.clear();
for (const value of other) {
this.add(value);
}
return this;
}
clear(): void {
this.#hashmap.clear();
}
add(value: T): this {
this.#hashmap.set(this.hasher(value), value);
return this;
}
toggle(value: T): void {
const hash = this.hasher(value);
if (this.#hashmap.has(hash)) {
this.#hashmap.delete(hash);
} else {
this.#hashmap.set(hash, value);
}
}
delete(value: T): boolean {
return this.#hashmap.delete(this.hasher(value));
}
forEach(callbackfn: (value: T, key: T, set: Set<T>) => void, thisArg?: any): void {
this.#hashmap.forEach(value => callbackfn(value, value, thisArg ?? this));
}
has(value: T): boolean {
return this.#hashmap.has(this.hasher(value));
}
get size(): number {
return this.#hashmap.size;
}
entries(): IterableIterator<[T, T]> {
let nextIndex = 0;
const keys = Array.from(this.keys());
const values = Array.from(this.values());
return makeIterableIterator<[T, T]>({
next() {
const index = nextIndex++;
return index < values.length
? { value: [keys[index], values[index]], done: false }
: { done: true, value: undefined };
},
});
}
keys(): IterableIterator<T> {
return this.values();
}
values(): IterableIterator<T> {
let nextIndex = 0;
const observableValues = Array.from(this.#hashmap.values());
return makeIterableIterator<T>({
next: () => {
return nextIndex < observableValues.length
? { value: observableValues[nextIndex++], done: false }
: { done: true, value: undefined };
},
});
}
[Symbol.iterator](): IterableIterator<T> {
return this.#hashmap.values();
}
get [Symbol.toStringTag](): string {
return "Set";
}
toJSON(): T[] {
return Array.from(this);
}
toString(): string {
return "[object Set]";
}
}
export class ObservableHashSet<T> implements Set<T>, IInterceptable<ISetWillChange>, IListenable {
#hashmap: ObservableMap<string, T>;
get interceptors_(): IInterceptor<ISetWillChange<T>>[] {
return [];
}
get changeListeners_(): Function[] {
return [];
}
constructor(initialValues: Iterable<T>, protected hasher: (item: T) => string) {
this.#hashmap = observable.map<string, T>(Array.from(initialValues, value => [this.hasher(value), value]), undefined);
}
replace(other: ObservableHashSet<T> | ObservableSet<T> | Set<T> | readonly T[]): this {
return runInAction(() => {
if (other === null || other === undefined) {
return this;
}
if (!(Array.isArray(other) || other instanceof Set || other instanceof ObservableHashSet || other instanceof ObservableSet)) {
throw new Error(`ObservableHashSet: Cannot initialize set from ${other}`);
}
this.clear();
for (const value of other) {
this.add(value);
}
return this;
});
}
clear(): void {
this.#hashmap.clear();
}
add(value: T): this {
this.#hashmap.set(this.hasher(value), value);
return this;
}
toggle(value: T): void {
runInAction(() => {
const hash = this.hasher(value);
if (this.#hashmap.has(hash)) {
this.#hashmap.delete(hash);
} else {
this.#hashmap.set(hash, value);
}
});
}
delete(value: T): boolean {
return this.#hashmap.delete(this.hasher(value));
}
forEach(callbackfn: (value: T, key: T, set: Set<T>) => void, thisArg?: any): void {
this.#hashmap.forEach(value => callbackfn(value, value, thisArg ?? this));
}
has(value: T): boolean {
return this.#hashmap.has(this.hasher(value));
}
get size(): number {
return this.#hashmap.size;
}
entries(): IterableIterator<[T, T]> {
let nextIndex = 0;
const keys = Array.from(this.keys());
const values = Array.from(this.values());
return makeIterableIterator<[T, T]>({
next() {
const index = nextIndex++;
return index < values.length
? { value: [keys[index], values[index]], done: false }
: { done: true, value: undefined };
},
});
}
keys(): IterableIterator<T> {
return this.values();
}
values(): IterableIterator<T> {
let nextIndex = 0;
const observableValues = Array.from(this.#hashmap.values());
return makeIterableIterator<T>({
next: () => {
return nextIndex < observableValues.length
? { value: observableValues[nextIndex++], done: false }
: { done: true, value: undefined };
},
});
}
[Symbol.iterator](): IterableIterator<T> {
return this.#hashmap.values();
}
get [Symbol.toStringTag](): string {
return "Set";
}
toJSON(): T[] {
return Array.from(this);
}
toString(): string {
return "[object ObservableSet]";
}
}
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