@gameye/sdk/module/streams/split-transform.js

Node.js SDK for Gameye

import * as stream from "stream";
export class SplitTransform extends stream.Duplex {
    constructor(separator = /\r?\n/) {
        super({
            readableObjectMode: true,
            writableObjectMode: false,
        });
        this.separator = separator;
        this.buffer = "";
        this.flushing = false;
    }
    //#region Writable
    _write(chunk, encoding, callback) {
        this.buffer += String(chunk);
        this.flushBuffer();
        callback();
    }
    _final(callback) {
        this.flushBuffer();
        callback();
    }
    //#endregion
    //#region Readable
    _read(size) {
        this.flushing = true;
        this.flushBuffer();
    }
    //#endregion
    //#region Duplex
    _destroy(destroyError, callback) {
        callback(destroyError);
    }
    //#endregion
    flushBuffer() {
        while (this.flushing) {
            const part = this.nextPart();
            if (this.writable && part === null) {
                break;
            }
            this.flushing = this.push(part);
        }
    }
    nextPart() {
        const match = this.separator.exec(this.buffer);
        if (!match)
            return null;
        const part = this.buffer.substring(0, match.index);
        this.buffer = this.buffer.substring(match.index + match[0].length);
        return part;
    }
}
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