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import { type EventObject, off, on, send, size } from "./event";
import { SyncScheduler, type Scheduler } from "./schedulers";
import {
type OwnedReadable,
type OwnedWritable,
type Config,
type Disposer,
type Readable,
type SetValue,
type Subscriber,
type Version,
type Writable,
} from "./typings";
import { BRAND, strictEqual, UNIQUE_VALUE } from "./utils";
interface Subs<TValue> extends EventObject<TValue> {
lastVersion_: Version;
}
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 */
public subs_?: Map<Scheduler, Subs<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 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 */
public 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 batchTask_(): void {
if (this.subs_) {
for (const scheduler of this.subs_.keys()) {
scheduler(this);
}
}
}
/** @internal */
public schedulerTask_(scheduler: Scheduler): void {
const subs = this.subs_?.get(scheduler);
if (subs && size(subs)) {
const value = this.get();
if (subs.lastVersion_ !== this.version_) {
subs.lastVersion_ = this.version_;
send(subs, value);
}
}
}
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;
}
batchTasks.delete(this);
this.dependents_ = this.subs_ = 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(this, new Error("disposed"));
if (process.env.NODE_ENV !== "production") {
console.error(this.disposed_);
}
}
this.valueMaybeDirty_ = true;
const isFirst = batchStart();
batchTasks.add(this);
if (this.dependents_) {
for (const ref of this.dependents_) {
const dependent = ref.deref();
if (dependent && !batchTasks.has(dependent)) {
dependent.notify_();
}
}
}
isFirst && batchFlush();
}
/** @internal */
public onReaction_(subscriber: Subscriber<TValue>, scheduler: Scheduler = SyncScheduler): void {
let subs = this.subs_?.get(scheduler);
if (!subs) {
(this.subs_ ??= new Map()).set(scheduler, (subs = { lastVersion_: this.version }));
} else if (!size(subs)) {
// start tracking last first on first subscription
subs.lastVersion_ = this.version;
}
on(subs, subscriber);
}
public reaction(subscriber: Subscriber<TValue>, scheduler?: Scheduler): Disposer {
this.onReaction_(subscriber, scheduler);
return () => this.unsubscribe(subscriber);
}
/** @internal */
public removeDep_(dep: ReadableImpl): void {
this.deps_?.delete(dep);
if (this.weakRefSelf_) {
dep.dependents_?.delete(this.weakRefSelf_);
}
}
public subscribe(subscriber: Subscriber<TValue>, scheduler?: Scheduler): Disposer {
const disposer = this.reaction(subscriber, scheduler);
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, scheduler?: Scheduler): void {
if (this.subs_) {
if (subscriber) {
if (scheduler) {
const subs = this.subs_.get(scheduler);
subs && off(subs, subscriber);
} else {
for (const subs of this.subs_.values()) {
off(subs, subscriber);
}
}
} else {
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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