回答編集履歴
2
a
test
CHANGED
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@@ -52,7 +52,11 @@
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52
52
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53
53
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buffer = '';
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54
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55
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if (str !== '') {
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56
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55
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-
handler(str);
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57
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handler(str);
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}
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56
60
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});
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62
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1
a
test
CHANGED
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@@ -1,6 +1,8 @@
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1
1
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改行コードが右端に入っている，とかのオチでしょう．末尾の改行コードを削除すればいいだけですが，それに加えて一応**確実に**行単位で読み出しができるように書いてみます．(Node.js v5.10.0 で動作確認)
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2
2
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3
3
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4
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+
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5
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(reader.js)
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4
6
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5
7
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```javascript
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6
8
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@@ -8,36 +10,114 @@
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8
10
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9
11
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10
12
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11
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-
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13
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+
class LineReader
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12
14
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13
15
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{
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14
16
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15
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-
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17
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constructor(stream)
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16
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-
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19
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{
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18
20
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19
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-
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21
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this.stream = stream;
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20
22
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21
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-
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23
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}
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22
24
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23
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-
while (m = buffer.match(/([\s\S]*?)\r?\n$([\s\S]*)/m)) {
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24
25
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25
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-
lineHandler(m[1]);
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26
26
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27
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-
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27
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+
onLine(handler)
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28
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29
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-
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29
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{
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30
30
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31
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let buffer = '';
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32
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33
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this.stream.on('data', chunk => {
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34
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35
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buffer += chunk.toString();
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36
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37
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let m;
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38
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39
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while (m = buffer.match(/([\s\S]*?)\r?\n([\s\S]*)/m)) {
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40
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41
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handler(m[1]);
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42
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43
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buffer = m[2];
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44
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45
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}
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46
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31
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-
};
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47
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});
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48
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49
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this.stream.on('end', () => {
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50
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51
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let str = buffer;
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52
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53
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buffer = '';
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54
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55
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handler(str);
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56
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57
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});
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58
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59
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return this;
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60
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61
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}
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32
62
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33
63
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}
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34
64
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35
65
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36
66
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37
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-
process.stdin.on(
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67
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new LineReader(process.stdin).onLine(line => console.log(JSON.stringify(line)));
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38
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-
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39
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console.log(JSON.stringify(line));
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40
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-
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41
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-
}));
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42
68
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43
69
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```
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70
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+
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71
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72
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73
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試しに以下のようなコードの出力を流し込んでみてください．
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74
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+
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75
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76
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77
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(writer.js)
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78
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79
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```JavaScript
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80
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81
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'use strict';
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82
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83
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84
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85
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function sleep(ms)
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86
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87
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{
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88
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89
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return new Promise(r => setTimeout(r, ms));
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90
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91
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}
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92
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93
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94
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95
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Promise
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96
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97
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.resolve()
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98
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99
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.then(() => process.stdout.write("1行目: "))
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100
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101
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.then(() => sleep(500))
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102
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103
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.then(() => process.stdout.write("ab\n2行目: def"))
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104
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105
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.then(() => sleep(500))
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106
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107
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.then(() => process.stdout.write("\n"))
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108
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109
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.then(() => sleep(500))
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110
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111
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.then(() => process.stdout.write("3行目: 改行無しで終わります"))
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112
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|
113
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+
```
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114
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115
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116
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117
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(ターミナル)
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118
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+
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119
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+
```Bash
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120
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+
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121
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+
node writer.js | node reader.js
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122
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+
|
|
123
|
+
```
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