| 'use strict'; // undocumented cb() API, needed for core, not for public API | 
|   | 
| function destroy(err, cb) { | 
|   var _this = this; | 
|   | 
|   var readableDestroyed = this._readableState && this._readableState.destroyed; | 
|   var writableDestroyed = this._writableState && this._writableState.destroyed; | 
|   | 
|   if (readableDestroyed || writableDestroyed) { | 
|     if (cb) { | 
|       cb(err); | 
|     } else if (err) { | 
|       if (!this._writableState) { | 
|         process.nextTick(emitErrorNT, this, err); | 
|       } else if (!this._writableState.errorEmitted) { | 
|         this._writableState.errorEmitted = true; | 
|         process.nextTick(emitErrorNT, this, err); | 
|       } | 
|     } | 
|   | 
|     return this; | 
|   } // we set destroyed to true before firing error callbacks in order | 
|   // to make it re-entrance safe in case destroy() is called within callbacks | 
|   | 
|   | 
|   if (this._readableState) { | 
|     this._readableState.destroyed = true; | 
|   } // if this is a duplex stream mark the writable part as destroyed as well | 
|   | 
|   | 
|   if (this._writableState) { | 
|     this._writableState.destroyed = true; | 
|   } | 
|   | 
|   this._destroy(err || null, function (err) { | 
|     if (!cb && err) { | 
|       if (!_this._writableState) { | 
|         process.nextTick(emitErrorAndCloseNT, _this, err); | 
|       } else if (!_this._writableState.errorEmitted) { | 
|         _this._writableState.errorEmitted = true; | 
|         process.nextTick(emitErrorAndCloseNT, _this, err); | 
|       } else { | 
|         process.nextTick(emitCloseNT, _this); | 
|       } | 
|     } else if (cb) { | 
|       process.nextTick(emitCloseNT, _this); | 
|       cb(err); | 
|     } else { | 
|       process.nextTick(emitCloseNT, _this); | 
|     } | 
|   }); | 
|   | 
|   return this; | 
| } | 
|   | 
| function emitErrorAndCloseNT(self, err) { | 
|   emitErrorNT(self, err); | 
|   emitCloseNT(self); | 
| } | 
|   | 
| function emitCloseNT(self) { | 
|   if (self._writableState && !self._writableState.emitClose) return; | 
|   if (self._readableState && !self._readableState.emitClose) return; | 
|   self.emit('close'); | 
| } | 
|   | 
| function undestroy() { | 
|   if (this._readableState) { | 
|     this._readableState.destroyed = false; | 
|     this._readableState.reading = false; | 
|     this._readableState.ended = false; | 
|     this._readableState.endEmitted = false; | 
|   } | 
|   | 
|   if (this._writableState) { | 
|     this._writableState.destroyed = false; | 
|     this._writableState.ended = false; | 
|     this._writableState.ending = false; | 
|     this._writableState.finalCalled = false; | 
|     this._writableState.prefinished = false; | 
|     this._writableState.finished = false; | 
|     this._writableState.errorEmitted = false; | 
|   } | 
| } | 
|   | 
| function emitErrorNT(self, err) { | 
|   self.emit('error', err); | 
| } | 
|   | 
| function errorOrDestroy(stream, err) { | 
|   // We have tests that rely on errors being emitted | 
|   // in the same tick, so changing this is semver major. | 
|   // For now when you opt-in to autoDestroy we allow | 
|   // the error to be emitted nextTick. In a future | 
|   // semver major update we should change the default to this. | 
|   var rState = stream._readableState; | 
|   var wState = stream._writableState; | 
|   if (rState && rState.autoDestroy || wState && wState.autoDestroy) stream.destroy(err);else stream.emit('error', err); | 
| } | 
|   | 
| module.exports = { | 
|   destroy: destroy, | 
|   undestroy: undestroy, | 
|   errorOrDestroy: errorOrDestroy | 
| }; |