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denoland-deno/ext/node/polyfills/_fs/_fs_readlink.ts
Bartek Iwańczuk d47147fb6a
feat(ext/node): embed std/node into the snapshot (#17724)
This commit moves "deno_std/node" in "ext/node" crate. The code is
transpiled and snapshotted during the build process.

During the first pass a minimal amount of work was done to create the
snapshot, a lot of code in "ext/node" depends on presence of "Deno"
global. This code will be gradually fixed in the follow up PRs to migrate
it to import relevant APIs from "internal:" modules.

Currently the code from snapshot is not used in any way, and all
Node/npm compatibility still uses code from 
"https://deno.land/std/node" (or from the location specified by 
"DENO_NODE_COMPAT_URL"). This will also be handled in a follow 
up PRs.

---------

Co-authored-by: crowlkats <crowlkats@toaxl.com>
Co-authored-by: Divy Srivastava <dj.srivastava23@gmail.com>
Co-authored-by: Yoshiya Hinosawa <stibium121@gmail.com>
2023-02-14 17:38:45 +01:00

89 lines
2.2 KiB
TypeScript

// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
import { TextEncoder } from "internal:deno_web/08_text_encoding.js";
import {
intoCallbackAPIWithIntercept,
MaybeEmpty,
notImplemented,
} from "internal:deno_node/polyfills/_utils.ts";
import { fromFileUrl } from "internal:deno_node/polyfills/path.ts";
import { promisify } from "internal:deno_node/polyfills/internal/util.mjs";
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,
) {
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 const readlinkPromise = promisify(readlink) as (
path: string | URL,
opt?: ReadlinkOptions,
) => Promise<string | Uint8Array>;
export function readlinkSync(
path: string | URL,
opt?: ReadlinkOptions,
): string | Uint8Array {
path = path instanceof URL ? fromFileUrl(path) : path;
return maybeEncode(Deno.readLinkSync(path), getEncoding(opt));
}