@hazae41/box/dist/esm/src/mods/box/index.mjs

Rust-like Box and similar objects for TypeScript

import { BorrowedError, DroppedError, Borrow, OwnedError } from '../borrow/index.mjs';

var _a;
class MovedError extends Error {
    #class = _a;
    name = this.#class.name;
    constructor() {
        super(`Resource has been moved`);
    }
}
_a = MovedError;
/**
 * An ownable and borrowable reference
 */
class Box {
    value;
    #state = "owned";
    /**
     * An ownable reference
     * @param value
     */
    constructor(value) {
        this.value = value;
    }
    [Symbol.dispose]() {
        if (this.dropped)
            return;
        if (this.owned)
            this.value[Symbol.dispose]();
        this.#state = "dropped";
    }
    async [Symbol.asyncDispose]() {
        this[Symbol.dispose]();
    }
    static create(value) {
        return new Box(value);
    }
    static createAsDropped(value) {
        const box = new Box(value);
        box.#state = "dropped";
        return box;
    }
    get owned() {
        return this.#state === "owned";
    }
    get borrowed() {
        return this.#state === "borrowed";
    }
    get dropped() {
        return this.#state === "dropped";
    }
    /**
     * Get the value
     * @returns T
     */
    get() {
        return this.value;
    }
    /**
     * Get the value or null-like if not owned
     * @returns T or null-like if not owned
     */
    getOrNull() {
        if (!this.owned)
            return;
        return this.value;
    }
    /**
     * Get the value or throw if not owned
     * @returns T
     * @throws NotOwnedError if not owned
     */
    getOrThrow() {
        if (this.borrowed)
            throw new BorrowedError();
        if (this.dropped)
            throw new DroppedError();
        return this.value;
    }
    checkOrNull() {
        if (!this.owned)
            return;
        return this;
    }
    checkOrThrow() {
        if (this.borrowed)
            throw new BorrowedError();
        if (this.dropped)
            throw new DroppedError();
        return this;
    }
    /**
     * Get the value and set this as moved or null-like if not owned
     * @returns T or null-like if not owned
     */
    unwrapOrNull() {
        if (!this.owned)
            return;
        this.#state = "dropped";
        return this.value;
    }
    /**
     * Get the value and set this as moved or throw if not owned
     * @returns T
     * @throws BoxMovedError if not owned
     */
    unwrapOrThrow() {
        if (this.borrowed)
            throw new BorrowedError();
        if (this.dropped)
            throw new DroppedError();
        this.#state = "dropped";
        return this.value;
    }
    /**
     * Move the value to a new box and set this one as moved or null-like if already moved
     * @returns Box<T> or null-like if moved
     */
    moveOrNull() {
        if (!this.owned)
            return;
        this.#state = "dropped";
        return new Box(this.value);
    }
    /**
     * Move the value to a new box and set this one as moved or throw if already moved
     * @returns Box<T>
     * @throws BoxMovedError if already moved
     */
    moveOrThrow() {
        if (this.borrowed)
            throw new BorrowedError();
        if (this.dropped)
            throw new DroppedError();
        this.#state = "dropped";
        return new Box(this.value);
    }
    borrowOrNull() {
        if (!this.owned)
            return;
        this.#state = "borrowed";
        return new Borrow(this);
    }
    borrowOrThrow() {
        if (this.borrowed)
            throw new BorrowedError();
        if (this.dropped)
            throw new DroppedError();
        this.#state = "borrowed";
        return new Borrow(this);
    }
    returnOrThrow() {
        if (this.owned)
            throw new OwnedError();
        if (this.borrowed)
            this.#state = "owned";
        else if (this.dropped)
            this.value[Symbol.dispose]();
        return;
    }
}

export { Box, MovedError };
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