'use strict'
 
var stream = require('stream')
var stdin = process.stdin
var stdout = process.stdout
 
 
// 本実装
stream.prototype.addLineSwitch = function (outputs, controller) {
	var input = this
	var output_trash = new stream.Writable()
	output_trash._write = function () {}
	var rl = require('readline').createInterface(input, output_trash)
	rl.on('line', function (line) {
		var output = outputs[controller(line, outputs)]
		if (output) output.write(new Buffer(line + '\n'))
	})
}
 
 
// 複数のストリーム出力を１つのストリーム（標準出力）でテスト出来るようにするためのもの
stream.prototype.markingWrap = function (id) {
	var neo_stream = new stream.Writable()
	var raw_stream = this
	neo_stream._write = function (raw_chunk, encoding, callback) {
		var neo_chunk = new Buffer(id + ': ' + raw_chunk)
		raw_stream.write(neo_chunk, encoding, callback)
	}
	return neo_stream
}
 
 
// 標準出力をラップしてそれぞれ新しいストリームを作る
var output_num = stdout.markingWrap('    number-stream')
var output_alp = stdout.markingWrap('  alphabet-stream')
var output_def = stdout.markingWrap('   default-stream')
 
 
// 出力先とコントローラーの設定
var outputs = {num: output_num, alp: output_alp, def: output_def}
var controller = function (line, outputs) {
	if (line.match(/^\d+$/)) return 'num'
	if (line.match(/^\w+$/)) return 'alp'
	                         return 'def'
}
// controller内で、outputsオブジェクトのキーや、outputs配列のインデックスを返すとそこに出力される
// また、それらを返さずにcontroller内でもっと自由な制御をすることも可能
 
 
// 標準入力にスイッチリスナを追加
stdin.addLineSwitch(outputs, controller) 
 

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###コンソール表示見本###

abc
  alphabet-stream: abc
123
    number-stream: 123
!"#
   default-stream: !"#