Module

std/node/_fs/_fs_readlink.ts

Deno standard library
Go to Latest
File
// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.import { intoCallbackAPIWithIntercept, MaybeEmpty, notImplemented,} from "../_utils.ts";import { fromFileUrl } from "../path.ts";
type ReadlinkCallback = ( err: MaybeEmpty<Error>, linkString: MaybeEmpty<string | Uint8Array>,) => void;
interface ReadlinkOptions { encoding?: string | null;}
function maybeEncode( data: string, encoding: string | null,): string | Uint8Array { if (encoding === "buffer") { return new TextEncoder().encode(data); } return data;}
function getEncoding( optOrCallback?: ReadlinkOptions | ReadlinkCallback,): string | null { if (!optOrCallback || typeof optOrCallback === "function") { return null; } else { if (optOrCallback.encoding) { if ( optOrCallback.encoding === "utf8" || optOrCallback.encoding === "utf-8" ) { return "utf8"; } else if (optOrCallback.encoding === "buffer") { return "buffer"; } else { notImplemented(`fs.readlink encoding=${optOrCallback.encoding}`); } } return null; }}
export function readlink( path: string | URL, optOrCallback: ReadlinkCallback | ReadlinkOptions, callback?: ReadlinkCallback,): void { path = path instanceof URL ? fromFileUrl(path) : path;
let cb: ReadlinkCallback | undefined; if (typeof optOrCallback === "function") { cb = optOrCallback; } else { cb = callback; }
const encoding = getEncoding(optOrCallback);
intoCallbackAPIWithIntercept<string, Uint8Array | string>( Deno.readLink, (data: string): string | Uint8Array => maybeEncode(data, encoding), cb, path, );}
export function readlinkSync( path: string | URL, opt?: ReadlinkOptions,): string | Uint8Array { path = path instanceof URL ? fromFileUrl(path) : path;
return maybeEncode(Deno.readLinkSync(path), getEncoding(opt));}