| // 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); |
| } |
| } |