text2json/src/streamify.ts

Performant parser for textual data (CSV parser)

import * as util from 'util'
import * as stream from 'stream'

/**
 * Wrap objects as a readable stream
 * 
 * @param {Object} source Object to be converted
 * @param {Object} options Stream options 
 * @returns {ReadStream} <tt>source</tt> wrapped as a readable stream
 */
export var createReadStream = (source : any, options : any) => {
  return new MultiStream(source, options)
}

var MultiStream = function (object, options) {
  if (object instanceof Buffer || typeof object === 'string') {
    options = options || {};
    stream.Readable.call(this, {
      highWaterMark: options.highWaterMark,
      encoding: options.encoding
    });
  } else {
    stream.Readable.call(this, { objectMode: true });
  }
  this._object = object;
}

util.inherits(MultiStream, stream.Readable);

MultiStream.prototype._read = function () {
  this.push(this._object);
  this._object = null;
}