@hazae41/box/dist/cjs/src/mods/borrow/index.cjs.map

Rust-like Box and similar objects for TypeScript

{"version":3,"file":"index.cjs","sources":["../../../../../src/mods/borrow/index.ts"],"sourcesContent":["import { Nullable } from \"libs/nullable/index.js\"\n\nexport class OwnedError extends Error {\n  readonly #class = OwnedError\n  readonly name = this.#class.name\n\n  constructor() {\n    super(`Resource is owned`)\n  }\n}\n\nexport class BorrowedError extends Error {\n  readonly #class = BorrowedError\n  readonly name = this.#class.name\n\n  constructor() {\n    super(`Resource is borrowed`)\n  }\n}\n\nexport class DroppedError extends Error {\n  readonly #class = DroppedError\n  readonly name = this.#class.name\n\n  constructor() {\n    super(`Resource is dropped`)\n  }\n}\n\nexport interface Borrowable<T extends Disposable> {\n  readonly value: T\n\n  readonly owned: boolean\n\n  readonly borrowed: boolean\n\n  readonly dropped: boolean\n\n  borrowOrNull(): Nullable<Borrow<T>>\n  borrowOrThrow(): Borrow<T>\n\n  returnOrThrow(): void\n}\n\nexport type BorrowState =\n  | \"owned\"\n  | \"borrowed\"\n  | \"dropped\"\n\nexport class Borrow<T extends Disposable> {\n\n  #state: BorrowState = \"owned\"\n\n  constructor(\n    readonly parent: Borrowable<T>\n  ) { }\n\n  [Symbol.dispose]() {\n    if (this.dropped)\n      return\n\n    if (this.owned)\n      this.parent.returnOrThrow()\n\n    this.#state = \"dropped\"\n  }\n\n  async [Symbol.asyncDispose]() {\n    this[Symbol.dispose]()\n  }\n\n  get value() {\n    return this.parent.value\n  }\n\n  get owned() {\n    return this.#state === \"owned\"\n  }\n\n  get borrowed() {\n    return this.#state === \"borrowed\"\n  }\n\n  get dropped() {\n    return this.#state === \"dropped\"\n  }\n\n  get() {\n    return this.value\n  }\n\n  getOrNull(): Nullable<T> {\n    if (!this.owned)\n      return\n    return this.value\n  }\n\n  getOrThrow(): T {\n    if (this.borrowed)\n      throw new BorrowedError()\n    if (this.dropped)\n      throw new DroppedError()\n    return this.value\n  }\n\n  checkOrNull(): Nullable<this> {\n    if (!this.owned)\n      return\n    return this\n  }\n\n  checkOrThrow(): this {\n    if (this.borrowed)\n      throw new BorrowedError()\n    if (this.dropped)\n      throw new DroppedError()\n    return this\n  }\n\n  borrowOrNull(): Nullable<Borrow<T>> {\n    if (!this.owned)\n      return\n    this.#state = \"borrowed\"\n\n    return new Borrow(this)\n  }\n\n  borrowOrThrow(): Borrow<T> {\n    if (this.borrowed)\n      throw new BorrowedError()\n    if (this.dropped)\n      throw new DroppedError()\n    this.#state = \"borrowed\"\n\n    return new Borrow(this)\n  }\n\n  returnOrThrow(): void {\n    if (this.owned)\n      throw new OwnedError()\n\n    if (this.borrowed)\n      this.#state = \"owned\"\n    else if (this.dropped)\n      this.parent.returnOrThrow()\n\n    return\n  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