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import {
type OwnedReadable,
type OwnedWritable,
type Config,
type Disposer,
type Readable,
type SetValue,
type Subscriber,
type Version,
type Writable,
} from "./typings";
import { BRAND, invokeEach, strictEqual, UNIQUE_VALUE } from "./utils";
export type Deps = Map<ReadableImpl, Version>;
const registry = /* @__PURE__ */ new FinalizationRegistry<{
d: Deps;
r: WeakRef<ReadableImpl>;
}>(({ d, r }) => {
for (const dep of d.keys()) {
dep.dependents_?.delete(r);
}
});
export interface CreateReadable {
/**
* Creates a Readonly with the given value.
*
* @returns A tuple with the Readonly and a function to set the value.
*/
<TValue = any>(): [OwnedReadable<NoInfer<TValue> | undefined>, SetValue<NoInfer<TValue> | undefined>];
/**
* Creates a Readonly with the given value.
*
* @param value
* @param config Optional custom config.
* @returns A tuple with the Readonly and a function to set the value.
*/
(value: [], config?: Config<any[]>): [OwnedReadable<any[]>, SetValue<any[]>];
/**
* Creates a Readonly with the given value.
*
* @param value
* @param config Optional custom config.
* @returns A tuple with the Readonly and a function to set the value.
*/
<TValue = any>(value: TValue, config?: Config<TValue>): [OwnedReadable<NoInfer<TValue>>, SetValue<NoInfer<TValue>>];
/**
* Creates a Readonly with the given value.
*
* @param value
* @param config Optional custom config.
* @returns A tuple with the Readonly and a function to set the value.
*/
<TValue = any>(
value?: TValue,
config?: Config<TValue>,
): [OwnedReadable<NoInfer<TValue | undefined>>, SetValue<NoInfer<TValue | undefined>>];
}
/** @internal */
export class ReadableImpl<TValue = any> implements BatchTask {
/**
* @internal
*/
public readonly [BRAND]: BRAND = BRAND;
/**
* @internal
*/
public dependents_?: Set<WeakRef<ReadableImpl>>;
/**
* @internal
*/
public deps_?: Map<ReadableImpl, Version>;
/**
* @internal
*/
public equal_?: (newValue: TValue, oldValue: TValue) => boolean;
public name?: string;
public set?: (value: TValue) => void;
/**
* @internal
*/
private _subs_?: Set<Subscriber<TValue>>;
public get $version(): Version {
this.get();
return this._version_;
}
public get value(): TValue {
return this.get();
}
public set value(value: TValue) {
this.set?.(value);
}
/**
* @internal
*/
private _lastSubInvokeVersion_: Version = -1;
/**
* @internal
*/
private _disposed_?: Error | true;
/**
* @internal
*/
private _resolveValue_: (self: ReadableImpl<TValue>) => TValue;
/**
* @internal
*/
private _resolveValueError_: any;
/**
* @internal
*/
private _value_: TValue = UNIQUE_VALUE as TValue;
/**
* @internal
*/
private _valueMaybeDirty_ = true;
/**
* @internal
*/
private _version_: Version = -1;
/**
* @internal
*/
private _weakRefSelf_?: WeakRef<ReadableImpl<TValue>>;
/**
* @internal
*/
private _onDisposeValue_?: (oldValue: TValue) => void;
public constructor(
resolveValue: (self: ReadableImpl<TValue>) => TValue,
config?: Config<TValue>,
deps?: Map<ReadableImpl, Version>,
) {
this._resolveValue_ = resolveValue;
this.equal_ = (config?.equal ?? strictEqual) || undefined;
this.name = config?.name;
this.deps_ = deps;
this._onDisposeValue_ = config?.onDisposeValue;
}
/** @internal */
public task_(): void {
if (this._subs_?.size && this._lastSubInvokeVersion_ !== this.$version) {
this._lastSubInvokeVersion_ = this.$version;
invokeEach(this._subs_, this.get());
}
}
public addDep_(dep: ReadableImpl): void {
if (strictEqual(this.deps_?.get(dep), dep.$version)) return;
(this.deps_ ??= new Map()).set(dep, dep.$version);
if (!this._weakRefSelf_) {
registry.register(this, { d: this.deps_, r: (this._weakRefSelf_ = new WeakRef(this)) }, this.deps_);
}
(dep.dependents_ ??= new Set()).add(this._weakRefSelf_);
}
public dispose(): void {
if (this._disposed_) return;
if (process.env.NODE_ENV !== "production") {
this._disposed_ = new Error("[embra] Readable disposed at:");
} else {
this._disposed_ = true;
}
tasks.delete(this);
this.dependents_ = undefined;
if (this.deps_) {
registry.unregister(this.deps_);
if (this._weakRefSelf_) {
for (const dep of this.deps_.keys()) {
dep.dependents_?.delete(this._weakRefSelf_);
}
}
this.deps_.clear();
}
if (this._onDisposeValue_ && !strictEqual(this._value_, UNIQUE_VALUE)) {
this._onDisposeValue_(this._value_);
}
}
public get(): TValue {
if (this._valueMaybeDirty_) {
// reset state immediately so that recursive notify_ calls can mark this as dirty again
this._valueMaybeDirty_ = false;
let changed = !this.deps_;
if (this.deps_) {
for (const [dep, version] of this.deps_) {
if (!strictEqual(dep.$version, version)) {
changed = true;
break;
}
}
}
if (changed) {
this._resolveValueError_ = UNIQUE_VALUE;
try {
const value = this._resolveValue_(this);
if (!this.equal_?.(value, this._value_)) {
const oldValue = this._value_;
this._value_ = value;
this._version_ = (this._version_ + 1) | 0;
if (this._onDisposeValue_ && !strictEqual(oldValue, UNIQUE_VALUE) && !strictEqual(oldValue, value)) {
this._onDisposeValue_(oldValue);
}
}
} catch (e) {
this._valueMaybeDirty_ = true;
this._resolveValueError_ = e;
throw e;
}
}
}
if (!strictEqual(this._resolveValueError_, UNIQUE_VALUE)) {
throw this._resolveValueError_;
}
if (process.env.NODE_ENV !== "production") {
if (strictEqual(UNIQUE_VALUE, this._value_)) {
throw new Error("Cycle detected");
}
}
return this._value_;
}
/**
* @internal
*/
public notify_(): void {
if (this._disposed_) {
console.error(new Error("disposed"));
if (process.env.NODE_ENV !== "production") {
console.error(this._disposed_);
}
}
this._valueMaybeDirty_ = true;
const isFirst = batchStart();
tasks.add(this);
if (this.dependents_) {
for (const ref of this.dependents_) {
const dependent = ref.deref();
if (dependent && !tasks.has(dependent)) {
dependent.notify_();
}
}
}
isFirst && batchFlush();
}
/** @internal */
public onReaction_(subscriber: Subscriber<TValue>): void {
if (!this._subs_?.size) {
// start tracking last first on first subscription
this._lastSubInvokeVersion_ = this.$version;
}
(this._subs_ ??= new Set()).add(subscriber);
}
public reaction(subscriber: Subscriber<TValue>): Disposer {
this.onReaction_(subscriber);
return () => this.unsubscribe(subscriber);
}
public removeDep_(dep: ReadableImpl): void {
this.deps_?.delete(dep);
if (this._weakRefSelf_) {
dep.dependents_?.delete(this._weakRefSelf_);
}
}
public subscribe(subscriber: Subscriber<TValue>): Disposer {
const disposer = this.reaction(subscriber);
subscriber(this.get());
return disposer;
}
/**
* @returns the JSON representation of `this.value`.
*
* @example
* ```js
* const v$ = writable(writable(writable({ a: 1 })));
* JSON.stringify(v$); // '{"a":1}'
* ```
*/
public toJSON(key?: string): unknown {
const value = this.get() as null | undefined | { toJSON?: (key?: string) => unknown };
return value?.toJSON ? value.toJSON(key) : value;
}
/**
* @returns the string representation of `this.value`.
*
* @example
* ```js
* const v$ = writable(writable(writable(1)));
* console.log(`${v$}`); // "1"
* ```
*/
public toString(): string {
return "" + this.toJSON();
}
public unsubscribe(subscriber?: (...args: any[]) => any): void {
subscriber ? this._subs_?.delete(subscriber) : this._subs_?.clear();
}
public valueOf(): TValue {
return this.get();
}
}
export const readable: CreateReadable = <TValue = any>(
value?: TValue,
config?: Config<TValue | undefined>,
): [OwnedReadable<NoInfer<TValue> | undefined>, SetValue<NoInfer<TValue> | undefined>] => {
let currentValue = value;
const get = () => currentValue;
const v = new ReadableImpl(get, config);
const set = (value: TValue | undefined): void => {
if (!v.equal_?.(value, currentValue)) {
currentValue = value;
v.notify_();
}
};
return [v, set];
};
export interface ToWritable {
<TValue>($: OwnedReadable<TValue>, set: (this: void, value: TValue) => void): OwnedWritable<TValue>;
<TValue>($: Readable<TValue>, set: (this: void, value: TValue) => void): Writable<TValue>;
}
/**
* Converts a Readable to a Writable By adding a setter function.
* @param $
* @param set a function that sets the value of Readable.
* @returns The same Readable with the new setter.
*/
export const toWritable: ToWritable = <TValue>(
$: Readable<TValue>,
set: (this: void, value: TValue) => void,
): OwnedWritable<TValue> => ((($ as OwnedWritable<TValue>).set = set), $ as OwnedWritable<TValue>);
export interface CreateWritable {
/**
* Creates a Writable.
* @returns A Writable with undefined value.
*/
<TValue = any>(): OwnedWritable<TValue | undefined>;
/**
* Creates a Writable.
* @param value Initial value.
* @param config Optional custom config.
*/
(value: [], config?: Config<any[]>): OwnedWritable<any[]>;
/**
* Creates a Writable.
* @param value Initial value.
* @param config Optional custom config.
*/
<TValue = any>(value: TValue, config?: Config<TValue>): OwnedWritable<TValue>;
/**
* Creates a Writable.
* @param value Initial value.
* @param config Optional custom config.
*/
<TValue = any>(value?: TValue, config?: Config<TValue | undefined>): OwnedWritable<TValue>;
}
export const writable: CreateWritable = <TValue = any>(
value?: TValue,
config?: Config<TValue>,
): OwnedWritable<NoInfer<TValue | undefined>> => toWritable(...readable(value, config));
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