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+// 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;
+ }
+}); \ No newline at end of file