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Edit File : index.js \| Size : 5.72 KB
var stream = require('readable-stream') var eos = require('end-of-stream') var inherits = require('inherits') var shift = require('stream-shift') var SIGNAL_FLUSH = (Buffer.from && Buffer.from !== Uint8Array.from) ? Buffer.from([0]) : new Buffer([0]) var onuncork = function(self, fn) { if (self._corked) self.once('uncork', fn) else fn() } var autoDestroy = function (self, err) { if (self._autoDestroy) self.destroy(err) } var destroyer = function(self, end) { return function(err) { if (err) autoDestroy(self, err.message === 'premature close' ? null : err) else if (end && !self._ended) self.end() } } var end = function(ws, fn) { if (!ws) return fn() if (ws._writableState && ws._writableState.finished) return fn() if (ws._writableState) return ws.end(fn) ws.end() fn() } var toStreams2 = function(rs) { return new (stream.Readable)({objectMode:true, highWaterMark:16}).wrap(rs) } var Duplexify = function(writable, readable, opts) { if (!(this instanceof Duplexify)) return new Duplexify(writable, readable, opts) stream.Duplex.call(this, opts) this._writable = null this._readable = null this._readable2 = null this._autoDestroy = !opts \|\| opts.autoDestroy !== false this._forwardDestroy = !opts \|\| opts.destroy !== false this._forwardEnd = !opts \|\| opts.end !== false this._corked = 1 // start corked this._ondrain = null this._drained = false this._forwarding = false this._unwrite = null this._unread = null this._ended = false this.destroyed = false if (writable) this.setWritable(writable) if (readable) this.setReadable(readable) } inherits(Duplexify, stream.Duplex) Duplexify.obj = function(writable, readable, opts) { if (!opts) opts = {} opts.objectMode = true opts.highWaterMark = 16 return new Duplexify(writable, readable, opts) } Duplexify.prototype.cork = function() { if (++this._corked === 1) this.emit('cork') } Duplexify.prototype.uncork = function() { if (this._corked && --this._corked === 0) this.emit('uncork') } Duplexify.prototype.setWritable = function(writable) { if (this._unwrite) this._unwrite() if (this.destroyed) { if (writable && writable.destroy) writable.destroy() return } if (writable === null \|\| writable === false) { this.end() return } var self = this var unend = eos(writable, {writable:true, readable:false}, destroyer(this, this._forwardEnd)) var ondrain = function() { var ondrain = self._ondrain self._ondrain = null if (ondrain) ondrain() } var clear = function() { self._writable.removeListener('drain', ondrain) unend() } if (this._unwrite) process.nextTick(ondrain) // force a drain on stream reset to avoid livelocks this._writable = writable this._writable.on('drain', ondrain) this._unwrite = clear this.uncork() // always uncork setWritable } Duplexify.prototype.setReadable = function(readable) { if (this._unread) this._unread() if (this.destroyed) { if (readable && readable.destroy) readable.destroy() return } if (readable === null \|\| readable === false) { this.push(null) this.resume() return } var self = this var unend = eos(readable, {writable:false, readable:true}, destroyer(this)) var onreadable = function() { self._forward() } var onend = function() { self.push(null) } var clear = function() { self._readable2.removeListener('readable', onreadable) self._readable2.removeListener('end', onend) unend() } this._drained = true this._readable = readable this._readable2 = readable._readableState ? readable : toStreams2(readable) this._readable2.on('readable', onreadable) this._readable2.on('end', onend) this._unread = clear this._forward() } Duplexify.prototype._read = function() { this._drained = true this._forward() } Duplexify.prototype._forward = function() { if (this._forwarding \|\| !this._readable2 \|\| !this._drained) return this._forwarding = true var data while (this._drained && (data = shift(this._readable2)) !== null) { if (this.destroyed) continue this._drained = this.push(data) } this._forwarding = false } Duplexify.prototype.destroy = function(err) { if (this.destroyed) return this.destroyed = true var self = this process.nextTick(function() { self._destroy(err) }) } Duplexify.prototype._destroy = function(err) { if (err) { var ondrain = this._ondrain this._ondrain = null if (ondrain) ondrain(err) else this.emit('error', err) } if (this._forwardDestroy) { if (this._readable && this._readable.destroy) this._readable.destroy() if (this._writable && this._writable.destroy) this._writable.destroy() } this.emit('close') } Duplexify.prototype._write = function(data, enc, cb) { if (this.destroyed) return cb() if (this._corked) return onuncork(this, this._write.bind(this, data, enc, cb)) if (data === SIGNAL_FLUSH) return this._finish(cb) if (!this._writable) return cb() if (this._writable.write(data) === false) this._ondrain = cb else cb() } Duplexify.prototype._finish = function(cb) { var self = this this.emit('preend') onuncork(this, function() { end(self._forwardEnd && self._writable, function() { // haxx to not emit prefinish twice if (self._writableState.prefinished === false) self._writableState.prefinished = true self.emit('prefinish') onuncork(self, cb) }) }) } Duplexify.prototype.end = function(data, enc, cb) { if (typeof data === 'function') return this.end(null, null, data) if (typeof enc === 'function') return this.end(data, null, enc) this._ended = true if (data) this.write(data) if (!this._writableState.ending) this.write(SIGNAL_FLUSH) return stream.Writable.prototype.end.call(this, cb) } module.exports = Duplexify Back

Edit File : index.js | Size : 5.72 KB

var stream = require('readable-stream')
var eos = require('end-of-stream')
var inherits = require('inherits')
var shift = require('stream-shift')

var SIGNAL_FLUSH = (Buffer.from && Buffer.from !== Uint8Array.from)
  ? Buffer.from([0])
  : new Buffer([0])

var onuncork = function(self, fn) {
  if (self._corked) self.once('uncork', fn)
  else fn()
}

var autoDestroy = function (self, err) {
  if (self._autoDestroy) self.destroy(err)
}

var destroyer = function(self, end) {
  return function(err) {
    if (err) autoDestroy(self, err.message === 'premature close' ? null : err)
    else if (end && !self._ended) self.end()
  }
}

var end = function(ws, fn) {
  if (!ws) return fn()
  if (ws._writableState && ws._writableState.finished) return fn()
  if (ws._writableState) return ws.end(fn)
  ws.end()
  fn()
}

var toStreams2 = function(rs) {
  return new (stream.Readable)({objectMode:true, highWaterMark:16}).wrap(rs)
}

var Duplexify = function(writable, readable, opts) {
  if (!(this instanceof Duplexify)) return new Duplexify(writable, readable, opts)
  stream.Duplex.call(this, opts)

this._writable = null
  this._readable = null
  this._readable2 = null

this._autoDestroy = !opts || opts.autoDestroy !== false
  this._forwardDestroy = !opts || opts.destroy !== false
  this._forwardEnd = !opts || opts.end !== false
  this._corked = 1 // start corked
  this._ondrain = null
  this._drained = false
  this._forwarding = false
  this._unwrite = null
  this._unread = null
  this._ended = false

this.destroyed = false

if (writable) this.setWritable(writable)
  if (readable) this.setReadable(readable)
}

inherits(Duplexify, stream.Duplex)

Duplexify.obj = function(writable, readable, opts) {
  if (!opts) opts = {}
  opts.objectMode = true
  opts.highWaterMark = 16
  return new Duplexify(writable, readable, opts)
}

Duplexify.prototype.cork = function() {
  if (++this._corked === 1) this.emit('cork')
}

Duplexify.prototype.uncork = function() {
  if (this._corked && --this._corked === 0) this.emit('uncork')
}

Duplexify.prototype.setWritable = function(writable) {
  if (this._unwrite) this._unwrite()

if (this.destroyed) {
    if (writable && writable.destroy) writable.destroy()
    return
  }

if (writable === null || writable === false) {
    this.end()
    return
  }

var self = this
  var unend = eos(writable, {writable:true, readable:false}, destroyer(this, this._forwardEnd))

var ondrain = function() {
    var ondrain = self._ondrain
    self._ondrain = null
    if (ondrain) ondrain()
  }

var clear = function() {
    self._writable.removeListener('drain', ondrain)
    unend()
  }

if (this._unwrite) process.nextTick(ondrain) // force a drain on stream reset to avoid livelocks

this._writable = writable
  this._writable.on('drain', ondrain)
  this._unwrite = clear

this.uncork() // always uncork setWritable
}

Duplexify.prototype.setReadable = function(readable) {
  if (this._unread) this._unread()

if (this.destroyed) {
    if (readable && readable.destroy) readable.destroy()
    return
  }

if (readable === null || readable === false) {
    this.push(null)
    this.resume()
    return
  }

var self = this
  var unend = eos(readable, {writable:false, readable:true}, destroyer(this))

var onreadable = function() {
    self._forward()
  }

var onend = function() {
    self.push(null)
  }

var clear = function() {
    self._readable2.removeListener('readable', onreadable)
    self._readable2.removeListener('end', onend)
    unend()
  }

this._drained = true
  this._readable = readable
  this._readable2 = readable._readableState ? readable : toStreams2(readable)
  this._readable2.on('readable', onreadable)
  this._readable2.on('end', onend)
  this._unread = clear

this._forward()
}

Duplexify.prototype._read = function() {
  this._drained = true
  this._forward()
}

Duplexify.prototype._forward = function() {
  if (this._forwarding || !this._readable2 || !this._drained) return
  this._forwarding = true

var data

while (this._drained && (data = shift(this._readable2)) !== null) {
    if (this.destroyed) continue
    this._drained = this.push(data)
  }

this._forwarding = false
}

Duplexify.prototype.destroy = function(err) {
  if (this.destroyed) return
  this.destroyed = true

var self = this
  process.nextTick(function() {
    self._destroy(err)
  })
}

Duplexify.prototype._destroy = function(err) {
  if (err) {
    var ondrain = this._ondrain
    this._ondrain = null
    if (ondrain) ondrain(err)
    else this.emit('error', err)
  }

if (this._forwardDestroy) {
    if (this._readable && this._readable.destroy) this._readable.destroy()
    if (this._writable && this._writable.destroy) this._writable.destroy()
  }

this.emit('close')
}

Duplexify.prototype._write = function(data, enc, cb) {
  if (this.destroyed) return cb()
  if (this._corked) return onuncork(this, this._write.bind(this, data, enc, cb))
  if (data === SIGNAL_FLUSH) return this._finish(cb)
  if (!this._writable) return cb()

if (this._writable.write(data) === false) this._ondrain = cb
  else cb()
}

Duplexify.prototype._finish = function(cb) {
  var self = this
  this.emit('preend')
  onuncork(this, function() {
    end(self._forwardEnd && self._writable, function() {
      // haxx to not emit prefinish twice
      if (self._writableState.prefinished === false) self._writableState.prefinished = true
      self.emit('prefinish')
      onuncork(self, cb)
    })
  })
}

Duplexify.prototype.end = function(data, enc, cb) {
  if (typeof data === 'function') return this.end(null, null, data)
  if (typeof enc === 'function') return this.end(data, null, enc)
  this._ended = true
  if (data) this.write(data)
  if (!this._writableState.ending) this.write(SIGNAL_FLUSH)
  return stream.Writable.prototype.end.call(this, cb)
}

module.exports = Duplexify

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