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// Copyright Node.js contributors. All rights reserved. MIT License.
import { Buffer } from "../buffer.ts";
import EventEmitter from "../events.ts";
import type Readable from "./readable.ts";
import type Writable from "./writable.ts";
import { types } from "../util.ts";
class Stream extends EventEmitter {
constructor() {
super();
}
static _isUint8Array = types.isUint8Array;
static _uint8ArrayToBuffer = (chunk: Uint8Array) => Buffer.from(chunk);
pipe(dest: Readable | Writable, options?: { end?: boolean }) {
// deno-lint-ignore no-this-alias
const source = this;
//TODO(Soremwar)
//isStdio exist on stdin || stdout only, which extend from Duplex
//if (!dest._isStdio && (options?.end ?? true)) {
//Find an alternative to be able to pipe streams to stdin & stdout
//Port them as well?
if (options?.end ?? true) {
source.on("end", onend);
source.on("close", onclose);
}
let didOnEnd = false;
function onend() {
if (didOnEnd) return;
didOnEnd = true;
// 'end' is only called on Writable streams
(dest as Writable).end();
}
function onclose() {
if (didOnEnd) return;
didOnEnd = true;
if (typeof dest.destroy === "function") dest.destroy();
}
// Don't leave dangling pipes when there are errors.
function onerror(this: Stream, er: Error) {
cleanup();
if (this.listenerCount("error") === 0) {
throw er; // Unhandled stream error in pipe.
}
}
source.on("error", onerror);
dest.on("error", onerror);
// Remove all the event listeners that were added.
function cleanup() {
source.removeListener("end", onend);
source.removeListener("close", onclose);
source.removeListener("error", onerror);
dest.removeListener("error", onerror);
source.removeListener("end", cleanup);
source.removeListener("close", cleanup);
dest.removeListener("close", cleanup);
}
source.on("end", cleanup);
source.on("close", cleanup);
dest.on("close", cleanup);
dest.emit("pipe", source);
return dest;
}
}
export default Stream;
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