fast-extract/dist/esm/streams/transforms/IteratorTransform.js

Extract contents from various archive types (tar, tar.bz2, tar.gz, tar.xz, tgz, zip)

import { PassThrough, Transform } from 'extract-base-iterator';
export default function createIteratorTransform(IteratorClass) {
    let IteratorTransform = class IteratorTransform extends Transform {
        _transform(chunk, encoding, callback) {
            if (this._stream) {
                this._stream.write(chunk, encoding, callback);
                return;
            }
            this._stream = new PassThrough();
            this._iterator = new IteratorClass(this._stream);
            const onEntry = (entry)=>{
                this.push(entry);
            };
            const onDone = (err)=>{
                if (!this._iterator) return;
                err || this.push(null);
                this._stream = null;
                this._iterator.destroy();
                this._iterator = null;
                this._callback ? this._callback(err) : this.end(err);
                this._callback = null;
            };
            this._iterator.forEach(onEntry, {
                concurrency: 1
            }, onDone);
            this._stream.write(chunk, encoding, callback);
        }
        _flush(callback) {
            if (!this._stream) return callback();
            this._callback = callback;
            this._stream.end();
            this._stream = null;
        }
        destroy(error) {
            if (this._stream) {
                this._stream.end();
                this._stream = null;
            }
            if (this._iterator) {
                const iterator = this._iterator;
                this._iterator = null;
                iterator.destroy(error);
                this.end(error);
            }
            return this;
        }
        constructor(options){
            options = options ? {
                ...options,
                objectMode: true
            } : {
                objectMode: true
            };
            super(options);
        }
    };
    return IteratorTransform;
}