mirror of
https://github.com/denoland/deno
synced 2024-10-13 19:42:29 +00:00
100 lines
2.8 KiB
TypeScript
100 lines
2.8 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import {
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BinaryEncodings,
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BinaryOptionsArgument,
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Encodings,
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FileOptionsArgument,
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getEncoding,
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TextEncodings,
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TextOptionsArgument,
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} from "./_fs_common.ts";
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import { Buffer } from "../buffer.ts";
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import { fromFileUrl } from "../path.ts";
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function maybeDecode(data: Uint8Array, encoding: TextEncodings): string;
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function maybeDecode(
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data: Uint8Array,
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encoding: BinaryEncodings | null,
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): Buffer;
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function maybeDecode(
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data: Uint8Array,
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encoding: Encodings | null,
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): string | Buffer {
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const buffer = new Buffer(data.buffer, data.byteOffset, data.byteLength);
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if (encoding && encoding !== "binary") return buffer.toString(encoding);
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return buffer;
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}
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type TextCallback = (err: Error | null, data?: string) => void;
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type BinaryCallback = (err: Error | null, data?: Buffer) => void;
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type GenericCallback = (err: Error | null, data?: string | Buffer) => void;
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type Callback = TextCallback | BinaryCallback | GenericCallback;
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export function readFile(
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path: string | URL,
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options: TextOptionsArgument,
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callback: TextCallback,
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): void;
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export function readFile(
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path: string | URL,
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options: BinaryOptionsArgument,
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callback: BinaryCallback,
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): void;
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export function readFile(
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path: string | URL,
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options: null | undefined | FileOptionsArgument,
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callback: BinaryCallback,
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): void;
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export function readFile(path: string | URL, callback: BinaryCallback): void;
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export function readFile(
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path: string | URL,
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optOrCallback?: FileOptionsArgument | Callback | null | undefined,
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callback?: Callback,
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): void {
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path = path instanceof URL ? fromFileUrl(path) : path;
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let cb: Callback | undefined;
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if (typeof optOrCallback === "function") {
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cb = optOrCallback;
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} else {
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cb = callback;
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}
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const encoding = getEncoding(optOrCallback);
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const p = Deno.readFile(path);
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if (cb) {
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p.then((data: Uint8Array) => {
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if (encoding && encoding !== "binary") {
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const text = maybeDecode(data, encoding);
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return (cb as TextCallback)(null, text);
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}
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const buffer = maybeDecode(data, encoding);
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(cb as BinaryCallback)(null, buffer);
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}).catch((err) => cb && cb(err));
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}
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}
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export function readFileSync(
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path: string | URL,
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opt: TextOptionsArgument,
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): string;
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export function readFileSync(
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path: string | URL,
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opt?: BinaryOptionsArgument,
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): Buffer;
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export function readFileSync(
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path: string | URL,
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opt?: FileOptionsArgument,
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): string | Buffer {
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path = path instanceof URL ? fromFileUrl(path) : path;
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const data = Deno.readFileSync(path);
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const encoding = getEncoding(opt);
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if (encoding && encoding !== "binary") {
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const text = maybeDecode(data, encoding);
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return text;
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}
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const buffer = maybeDecode(data, encoding);
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return buffer;
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}
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