src/vs/base/node/nodeStreams.ts
62 LOC · 60 covered · 2 uncovered · 11 ranges · 5 concepts · 4 introducers · 8 tests
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/*---------------------------------------------------------------------------------------------
nodeStreams.ts ×4
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
import { Transform } from 'stream';
import { binaryIndexOf } from '../common/buffer.js';
/**
* A Transform stream that splits the input on the "splitter" substring.
* The resulting chunks will contain (and trail with) the splitter match.
* The last chunk when the stream ends will be emitted even if a splitter
* is not encountered.
*/
export class StreamSplitter extends Transform {
private buffer: Buffer | undefined;
private readonly splitter: Buffer | number;
private readonly spitterLen: number;
constructor(splitter: string | number | Buffer) {
if (typeof splitter === 'number') {
this.splitter = splitter;
this.spitterLen = 1;
const buf = Buffer.isBuffer(splitter) ? splitter : Buffer.from(splitter);
this.splitter = buf.length === 1 ? buf[0] : buf;
this.spitterLen = buf.length;
}
}
override _transform(chunk: Buffer, _encoding: string, callback: (error?: Error | null, data?: Buffer) => void): void {
this.buffer = chunk;
} else {
this.buffer = Buffer.concat([this.buffer, chunk]);
}
let offset = 0;
while (offset < this.buffer.length) {
const index = typeof this.splitter === 'number'
break;
}
this.push(this.buffer.slice(offset, index + this.spitterLen));
offset = index + this.spitterLen;
}
this.buffer = offset === this.buffer.length ? undefined : this.buffer.slice(offset);
callback();
}
override _flush(callback: (error?: Error | null, data?: Buffer) => void): void {
this.push(this.buffer);
}
callback();
}