"use strict";
/**
* @license
* Copyright 2023 Google Inc.
* SPDX-License-Identifier: Apache-2.0
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.AsyncDisposableStack = exports.DisposableStack = exports.asyncDisposeSymbol = exports.disposeSymbol = void 0;
Symbol.dispose ??= Symbol('dispose');
Symbol.asyncDispose ??= Symbol('asyncDispose');
/**
* @internal
*/
exports.disposeSymbol = Symbol.dispose;
/**
* @internal
*/
exports.asyncDisposeSymbol = Symbol.asyncDispose;
/**
* @internal
*/
class DisposableStack {
#disposed = false;
#stack = [];
/**
* Returns a value indicating whether this stack has been disposed.
*/
get disposed() {
return this.#disposed;
}
/**
* Disposes each resource in the stack in the reverse order that they were added.
*/
dispose() {
if (this.#disposed) {
return;
}
this.#disposed = true;
for (const resource of this.#stack.reverse()) {
resource[exports.disposeSymbol]();
}
}
/**
* Adds a disposable resource to the stack, returning the resource.
*
* @param value - The resource to add. `null` and `undefined` will not be added,
* but will be returned.
* @returns The provided `value`.
*/
use(value) {
if (value) {
this.#stack.push(value);
}
return value;
}
/**
* Adds a value and associated disposal callback as a resource to the stack.
*
* @param value - The value to add.
* @param onDispose - The callback to use in place of a `[disposeSymbol]()`
* method. Will be invoked with `value` as the first parameter.
* @returns The provided `value`.
*/
adopt(value, onDispose) {
this.#stack.push({
[exports.disposeSymbol]() {
onDispose(value);
},
});
return value;
}
/**
* Adds a callback to be invoked when the stack is disposed.
*/
defer(onDispose) {
this.#stack.push({
[exports.disposeSymbol]() {
onDispose();
},
});
}
/**
* Move all resources out of this stack and into a new `DisposableStack`, and
* marks this stack as disposed.
*
* @example
*
* ```ts
* class C {
* #res1: Disposable;
* #res2: Disposable;
* #disposables: DisposableStack;
* constructor() {
* // stack will be disposed when exiting constructor for any reason
* using stack = new DisposableStack();
*
* // get first resource
* this.#res1 = stack.use(getResource1());
*
* // get second resource. If this fails, both `stack` and `#res1` will be disposed.
* this.#res2 = stack.use(getResource2());
*
* // all operations succeeded, move resources out of `stack` so that
* // they aren't disposed when constructor exits
* this.#disposables = stack.move();
* }
*
* [disposeSymbol]() {
* this.#disposables.dispose();
* }
* }
* ```
*/
move() {
if (this.#disposed) {
throw new ReferenceError('a disposed stack can not use anything new'); // step 3
}
const stack = new DisposableStack(); // step 4-5
stack.#stack = this.#stack;
this.#disposed = true;
return stack;
}
[exports.disposeSymbol] = this.dispose;
[Symbol.toStringTag] = 'DisposableStack';
}
exports.DisposableStack = DisposableStack;
/**
* @internal
*/
class AsyncDisposableStack {
#disposed = false;
#stack = [];
/**
* Returns a value indicating whether this stack has been disposed.
*/
get disposed() {
return this.#disposed;
}
/**
* Disposes each resource in the stack in the reverse order that they were added.
*/
async dispose() {
if (this.#disposed) {
return;
}
this.#disposed = true;
for (const resource of this.#stack.reverse()) {
await resource[exports.asyncDisposeSymbol]();
}
}
/**
* Adds a disposable resource to the stack, returning the resource.
*
* @param value - The resource to add. `null` and `undefined` will not be added,
* but will be returned.
* @returns The provided `value`.
*/
use(value) {
if (value) {
this.#stack.push(value);
}
return value;
}
/**
* Adds a value and associated disposal callback as a resource to the stack.
*
* @param value - The value to add.
* @param onDispose - The callback to use in place of a `[disposeSymbol]()`
* method. Will be invoked with `value` as the first parameter.
* @returns The provided `value`.
*/
adopt(value, onDispose) {
this.#stack.push({
[exports.asyncDisposeSymbol]() {
return onDispose(value);
},
});
return value;
}
/**
* Adds a callback to be invoked when the stack is disposed.
*/
defer(onDispose) {
this.#stack.push({
[exports.asyncDisposeSymbol]() {
return onDispose();
},
});
}
/**
* Move all resources out of this stack and into a new `DisposableStack`, and
* marks this stack as disposed.
*
* @example
*
* ```ts
* class C {
* #res1: Disposable;
* #res2: Disposable;
* #disposables: DisposableStack;
* constructor() {
* // stack will be disposed when exiting constructor for any reason
* using stack = new DisposableStack();
*
* // get first resource
* this.#res1 = stack.use(getResource1());
*
* // get second resource. If this fails, both `stack` and `#res1` will be disposed.
* this.#res2 = stack.use(getResource2());
*
* // all operations succeeded, move resources out of `stack` so that
* // they aren't disposed when constructor exits
* this.#disposables = stack.move();
* }
*
* [disposeSymbol]() {
* this.#disposables.dispose();
* }
* }
* ```
*/
move() {
if (this.#disposed) {
throw new ReferenceError('a disposed stack can not use anything new'); // step 3
}
const stack = new AsyncDisposableStack(); // step 4-5
stack.#stack = this.#stack;
this.#disposed = true;
return stack;
}
[exports.asyncDisposeSymbol] = this.dispose;
[Symbol.toStringTag] = 'AsyncDisposableStack';
}
exports.AsyncDisposableStack = AsyncDisposableStack;
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