// a duplex stream is just a stream that is both readable and writable. // Since JS doesn't have multiple prototypal inheritance, this class // prototypally inherits from Readable, and then parasitically from // Writable.
'use strict';
/*<replacement>*/
var objectKeys = Object.keys || function (obj) {
var keys = []; for (var key in obj) { keys.push(key); }return keys;
}; /*</replacement>*/
module.exports = Duplex;
/*<replacement>*/ var processNextTick = require('process-nextick-args'); /*</replacement>*/
/*<replacement>*/ var util = require('core-util-is'); util.inherits = require('inherits'); /*</replacement>*/
var Readable = require('./_stream_readable'); var Writable = require('./_stream_writable');
util.inherits(Duplex, Readable);
var keys = objectKeys(Writable.prototype); for (var v = 0; v < keys.length; v++) {
var method = keys[v]; if (!Duplex.prototype[method]) Duplex.prototype[method] = Writable.prototype[method];
}
function Duplex(options) {
if (!(this instanceof Duplex)) return new Duplex(options); Readable.call(this, options); Writable.call(this, options); if (options && options.readable === false) this.readable = false; if (options && options.writable === false) this.writable = false; this.allowHalfOpen = true; if (options && options.allowHalfOpen === false) this.allowHalfOpen = false; this.once('end', onend);
}
// the no-half-open enforcer function onend() {
// if we allow half-open state, or if the writable side ended, // then we're ok. if (this.allowHalfOpen || this._writableState.ended) return; // no more data can be written. // But allow more writes to happen in this tick. processNextTick(onEndNT, this);
}
function onEndNT(self) {
self.end();
}
function forEach(xs, f) {
for (var i = 0, l = xs.length; i < l; i++) { f(xs[i], i); }
}