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/**
* @license
* Copyright 2023 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
import type {EventType} from '../common/EventEmitter.js';
import type {EventEmitter} from '../common/EventEmitter.js';
import type {Disposed, Moveable} from '../common/types.js';
import {asyncDisposeSymbol, disposeSymbol} from './disposable.js';
import {Mutex} from './Mutex.js';
const instances = new WeakSet<object>();
export function moveable<
Class extends abstract new (...args: never[]) => Moveable,
>(Class: Class, _: ClassDecoratorContext<Class>): Class {
let hasDispose = false;
if (Class.prototype[disposeSymbol]) {
const dispose = Class.prototype[disposeSymbol];
Class.prototype[disposeSymbol] = function (this: InstanceType<Class>) {
if (instances.has(this)) {
instances.delete(this);
return;
}
return dispose.call(this);
};
hasDispose = true;
}
if (Class.prototype[asyncDisposeSymbol]) {
const asyncDispose = Class.prototype[asyncDisposeSymbol];
Class.prototype[asyncDisposeSymbol] = function (this: InstanceType<Class>) {
if (instances.has(this)) {
instances.delete(this);
return;
}
return asyncDispose.call(this);
};
hasDispose = true;
}
if (hasDispose) {
Class.prototype.move = function (
this: InstanceType<Class>
): InstanceType<Class> {
instances.add(this);
return this;
};
}
return Class;
}
export function throwIfDisposed<This extends Disposed>(
message: (value: This) => string = value => {
return `Attempted to use disposed ${value.constructor.name}.`;
}
) {
return (target: (this: This, ...args: any[]) => any, _: unknown) => {
return function (this: This, ...args: any[]): any {
if (this.disposed) {
throw new Error(message(this));
}
return target.call(this, ...args);
};
};
}
export function inertIfDisposed<This extends Disposed>(
target: (this: This, ...args: any[]) => any,
_: unknown
) {
return function (this: This, ...args: any[]): any {
if (this.disposed) {
return;
}
return target.call(this, ...args);
};
}
/**
* The decorator only invokes the target if the target has not been invoked with
* the same arguments before. The decorated method throws an error if it's
* invoked with a different number of elements: if you decorate a method, it
* should have the same number of arguments
*
* @internal
*/
export function invokeAtMostOnceForArguments(
target: (this: unknown, ...args: any[]) => any,
_: unknown
): typeof target {
const cache = new WeakMap();
let cacheDepth = -1;
return function (this: unknown, ...args: unknown[]) {
if (cacheDepth === -1) {
cacheDepth = args.length;
}
if (cacheDepth !== args.length) {
throw new Error(
'Memoized method was called with the wrong number of arguments'
);
}
let freshArguments = false;
let cacheIterator = cache;
for (const arg of args) {
if (cacheIterator.has(arg as object)) {
cacheIterator = cacheIterator.get(arg as object)!;
} else {
freshArguments = true;
cacheIterator.set(arg as object, new WeakMap());
cacheIterator = cacheIterator.get(arg as object)!;
}
}
if (!freshArguments) {
return;
}
return target.call(this, ...args);
};
}
export function guarded<T extends object>(
getKey = function (this: T): object {
return this;
}
) {
return (
target: (this: T, ...args: any[]) => Promise<any>,
_: ClassMethodDecoratorContext<T>
): typeof target => {
const mutexes = new WeakMap<object, Mutex>();
return async function (...args) {
const key = getKey.call(this);
let mutex = mutexes.get(key);
if (!mutex) {
mutex = new Mutex();
mutexes.set(key, mutex);
}
await using _ = await mutex.acquire();
return await target.call(this, ...args);
};
};
}
const bubbleHandlers = new WeakMap<object, Map<any, any>>();
/**
* Event emitter fields marked with `bubble` will have their events bubble up
* the field owner.
*/
// The type is too complicated to type.
// eslint-disable-next-line @typescript-eslint/explicit-module-boundary-types
export function bubble<T extends EventType[]>(events?: T) {
return <This extends EventEmitter<any>, Value extends EventEmitter<any>>(
{set, get}: ClassAccessorDecoratorTarget<This, Value>,
context: ClassAccessorDecoratorContext<This, Value>
): ClassAccessorDecoratorResult<This, Value> => {
context.addInitializer(function () {
const handlers = bubbleHandlers.get(this) ?? new Map();
if (handlers.has(events)) {
return;
}
const handler =
events !== undefined
? (type: EventType, event: unknown) => {
if (events.includes(type)) {
this.emit(type, event);
}
}
: (type: EventType, event: unknown) => {
this.emit(type, event);
};
handlers.set(events, handler);
bubbleHandlers.set(this, handlers);
});
return {
set(emitter) {
const handler = bubbleHandlers.get(this)!.get(events)!;
// In case we are re-setting.
const oldEmitter = get.call(this);
if (oldEmitter !== undefined) {
oldEmitter.off('*', handler);
}
if (emitter === undefined) {
return;
}
emitter.on('*', handler);
set.call(this, emitter);
},
// @ts-expect-error -- TypeScript incorrectly types init to require a
// return.
init(emitter) {
if (emitter === undefined) {
return;
}
const handler = bubbleHandlers.get(this)!.get(events)!;
emitter.on('*', handler);
return emitter;
},
};
};
}
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