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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"use strict";

var stream = require("stream");

function DuplexWrapper(options, writable, readable) {
  if (typeof readable === "undefined") {
    readable = writable;
    writable = options;
    options = null;
  }

  stream.Duplex.call(this, options);

  if (typeof readable.read !== "function") {
    readable = (new stream.Readable(options)).wrap(readable);
  }

  this._writable = writable;
  this._readable = readable;
  this._waiting = false;

  var self = this;

  writable.once("finish", function() {
    self.end();
  });

  this.once("finish", function() {
    writable.end();
  });

  readable.on("readable", function() {
    if (self._waiting) {
      self._waiting = false;
      self._read();
    }
  });

  readable.once("end", function() {
    self.push(null);
  });

  if (!options || typeof options.bubbleErrors === "undefined" || options.bubbleErrors) {
    writable.on("error", function(err) {
      self.emit("error", err);
    });

    readable.on("error", function(err) {
      self.emit("error", err);
    });
  }
}

DuplexWrapper.prototype = Object.create(stream.Duplex.prototype, {constructor: {value: DuplexWrapper}});

DuplexWrapper.prototype._write = function _write(input, encoding, done) {
  this._writable.write(input, encoding, done);
};

DuplexWrapper.prototype._read = function _read() {
  var buf;
  var reads = 0;
  while ((buf = this._readable.read()) !== null) {
    this.push(buf);
    reads++;
  }
  if (reads === 0) {
    this._waiting = true;
  }
};

module.exports = function duplex2(options, writable, readable) {
  return new DuplexWrapper(options, writable, readable);
};

module.exports.DuplexWrapper = DuplexWrapper;