oc-mux-demux/index.js

Multiplexing-demultiplexing of several object streams inside single object

// Generated by CoffeeScript 1.9.0

/*

  Multiplexing-demultiplexing of several object streams inside single object
  stream.
 */

(function() {
  var through;

  through = require('through2');

  module.exports = function(options) {
    var s;
    if (options == null) {
      options = {};
    }

    /*
    
      Create mux-demux stream.
    
      :param options: Object with options
      :option error: Propagate error on substreams (default ``false``)
     */
    s = through.obj(function(chunk, enc, cb) {
      var name, pos, ss;
      pos = chunk.indexOf('|');
      name = chunk.substring(0, pos);
      chunk = chunk.substring(++pos);
      ss = s.streams[name];
      if (!ss) {
        console.warn("orphaned data for stream " + name);
      } else {
        ss.push(chunk);
      }
      return cb();
    });
    s.streams = {};
    s.createStream = function(name) {
      var ss;
      ss = s.streams[name] = through.obj(function(chunk, enc, cb) {
        s.push(name + "|" + chunk);
        return cb();
      });
      s.on('end', function() {
        return ss.emit('end');
      });
      if (options.error) {
        s.on('error', function() {
          return ss.emit('error');
        });
      }
      return ss;
    };
    return s;
  };

}).call(this);