| // Copyright Joyent, Inc. and other Node contributors. |
| // |
| // Permission is hereby granted, free of charge, to any person obtaining a |
| // copy of this software and associated documentation files (the |
| // "Software"), to deal in the Software without restriction, including |
| // without limitation the rights to use, copy, modify, merge, publish, |
| // distribute, sublicense, and/or sell copies of the Software, and to permit |
| // persons to whom the Software is furnished to do so, subject to the |
| // following conditions: |
| // |
| // The above copyright notice and this permission notice shall be included |
| // in all copies or substantial portions of the Software. |
| // |
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN |
| // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
| // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| // USE OR OTHER DEALINGS IN THE SOFTWARE. |
| // 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; |
| |
| var Readable = require('./_stream_readable'); |
| |
| var Writable = require('./_stream_writable'); |
| |
| require('inherits')(Duplex, Readable); |
| |
| { |
| // Allow the keys array to be GC'ed. |
| 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); |
| this.allowHalfOpen = true; |
| |
| if (options) { |
| if (options.readable === false) this.readable = false; |
| if (options.writable === false) this.writable = false; |
| |
| if (options.allowHalfOpen === false) { |
| this.allowHalfOpen = false; |
| this.once('end', onend); |
| } |
| } |
| } |
| |
| Object.defineProperty(Duplex.prototype, 'writableHighWaterMark', { |
| // making it explicit this property is not enumerable |
| // because otherwise some prototype manipulation in |
| // userland will fail |
| enumerable: false, |
| get: function get() { |
| return this._writableState.highWaterMark; |
| } |
| }); |
| Object.defineProperty(Duplex.prototype, 'writableBuffer', { |
| // making it explicit this property is not enumerable |
| // because otherwise some prototype manipulation in |
| // userland will fail |
| enumerable: false, |
| get: function get() { |
| return this._writableState && this._writableState.getBuffer(); |
| } |
| }); |
| Object.defineProperty(Duplex.prototype, 'writableLength', { |
| // making it explicit this property is not enumerable |
| // because otherwise some prototype manipulation in |
| // userland will fail |
| enumerable: false, |
| get: function get() { |
| return this._writableState.length; |
| } |
| }); // the no-half-open enforcer |
| |
| function onend() { |
| // If the writable side ended, then we're ok. |
| if (this._writableState.ended) return; // no more data can be written. |
| // But allow more writes to happen in this tick. |
| |
| process.nextTick(onEndNT, this); |
| } |
| |
| function onEndNT(self) { |
| self.end(); |
| } |
| |
| Object.defineProperty(Duplex.prototype, 'destroyed', { |
| // making it explicit this property is not enumerable |
| // because otherwise some prototype manipulation in |
| // userland will fail |
| enumerable: false, |
| get: function get() { |
| if (this._readableState === undefined || this._writableState === undefined) { |
| return false; |
| } |
| |
| return this._readableState.destroyed && this._writableState.destroyed; |
| }, |
| set: function set(value) { |
| // we ignore the value if the stream |
| // has not been initialized yet |
| if (this._readableState === undefined || this._writableState === undefined) { |
| return; |
| } // backward compatibility, the user is explicitly |
| // managing destroyed |
| |
| |
| this._readableState.destroyed = value; |
| this._writableState.destroyed = value; |
| } |
| }); |