晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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var Stream = require('stream')

// through
//
// a stream that does nothing but re-emit the input.
// useful for aggregating a series of changing but not ending streams into one stream)

exports = module.exports = through
through.through = through

//create a readable writable stream.

function through (write, end, opts) {
  write = write || function (data) { this.queue(data) }
  end = end || function () { this.queue(null) }

  var ended = false, destroyed = false, buffer = [], _ended = false
  var stream = new Stream()
  stream.readable = stream.writable = true
  stream.paused = false

//  stream.autoPause   = !(opts && opts.autoPause   === false)
  stream.autoDestroy = !(opts && opts.autoDestroy === false)

  stream.write = function (data) {
    write.call(this, data)
    return !stream.paused
  }

  function drain() {
    while(buffer.length && !stream.paused) {
      var data = buffer.shift()
      if(null === data)
        return stream.emit('end')
      else
        stream.emit('data', data)
    }
  }

  stream.queue = stream.push = function (data) {
//    console.error(ended)
    if(_ended) return stream
    if(data === null) _ended = true
    buffer.push(data)
    drain()
    return stream
  }

  //this will be registered as the first 'end' listener
  //must call destroy next tick, to make sure we're after any
  //stream piped from here.
  //this is only a problem if end is not emitted synchronously.
  //a nicer way to do this is to make sure this is the last listener for 'end'

  stream.on('end', function () {
    stream.readable = false
    if(!stream.writable && stream.autoDestroy)
      process.nextTick(function () {
        stream.destroy()
      })
  })

  function _end () {
    stream.writable = false
    end.call(stream)
    if(!stream.readable && stream.autoDestroy)
      stream.destroy()
  }

  stream.end = function (data) {
    if(ended) return
    ended = true
    if(arguments.length) stream.write(data)
    _end() // will emit or queue
    return stream
  }

  stream.destroy = function () {
    if(destroyed) return
    destroyed = true
    ended = true
    buffer.length = 0
    stream.writable = stream.readable = false
    stream.emit('close')
    return stream
  }

  stream.pause = function () {
    if(stream.paused) return
    stream.paused = true
    return stream
  }

  stream.resume = function () {
    if(stream.paused) {
      stream.paused = false
      stream.emit('resume')
    }
    drain()
    //may have become paused again,
    //as drain emits 'data'.
    if(!stream.paused)
      stream.emit('drain')
    return stream
  }
  return stream
}