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  1. 'use strict'
  2.  
  3. var stream = require('stream')
  4. var stdin = process.stdin
  5. var stdout = process.stdout
  6.  
  7.  
  8. // 本実装
  9. stream.prototype.addLineSwitch = function (outputs, controller) {
  10. 	var input = this
  11. 	var output_trash = new stream.Writable()
  12. 	output_trash._write = function () {}
  13. 	var rl = require('readline').createInterface(input, output_trash)
  14. 	rl.on('line', function (line) {
  15. 		var output = outputs[controller(line, outputs)]
  16. 		if (output) output.write(new Buffer(line + '\n'))
  17. 	})
  18. }
  19.  
  20.  
  21. // ObjectStream
  22. function ObjectStream() {
  23. 	var obj_stream = new stream.Duplex({objectMode: true})
  24. 	obj_stream.data_array = []
  25. 	obj_stream._write = function (data, _, callback) {
  26. 		this.data_array.push(data)
  27. 		callback()
  28. 	}
  29. 	obj_stream._read  = function (size) {
  30. 		this.push(this.data_array.shift() || null)
  31. 	}
  32. 	return obj_stream
  33. }
  34.  
  35.  
  36. // 
  37. var even = new ObjectStream
  38. var odd  = new ObjectStream
  39.  
  40.  
  41. // 出力先とコントローラーの設定
  42. var outputs = [even, odd]
  43. var controller = function (line, outputs) {
  44. 	return line % 2
  45. }
  46.  
  47.  
  48. // 標準入力にスイッチリスナを追加
  49. stdin.addLineSwitch(outputs, controller) 
  50.  
  51.  
  52.  
  53.  
  54. ###以下どこかのタイミングで###
  55.  
  56. for (var i of even.data_array) console.log(i)　//等
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https://ideone.com/7bjAhw
language:
Text (text 6.10)
created:
11 years ago
visibility:
public

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