node.js:从stdin读取readSync吗? [英] node.js: readSync from stdin?

问题描述

是否可以从node.js中的stdin同步读取?因为我正在用JavaScript编写JavaScript编译器的想法(只是为了好玩). Brainfuck支持需要同步执行的读取操作.

Is it possible to synchronously read from stdin in node.js? Because I'm writing a brainfuck to JavaScript compiler in JavaScript (just for fun). Brainfuck supports a read operation which needs to be implemented synchronously.

我尝试过:

const fs = require('fs');
var c = fs.readSync(0,1,null,'utf-8');
console.log('character: '+c+' ('+c.charCodeAt(0)+')');

但这只会产生以下输出:

But this only produces this output:

fs:189
  var r = binding.read(fd, buffer, offset, length, position);
              ^
Error: EAGAIN, Resource temporarily unavailable
    at Object.readSync (fs:189:19)
    at Object.<anonymous> (/home/.../stdin.js:3:12)
    at Module._compile (module:426:23)
    at Module._loadScriptSync (module:436:8)
    at Module.loadSync (module:306:10)
    at Object.runMain (module:490:22)
    at node.js:254:10

推荐答案

我不知道什么时候出现，但这是向前迈出的有益一步:

I've no idea when this showed up but this is a helpful step forward: http://nodejs.org/api/readline.html

var readline = require('readline');

var rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
  terminal: false
});

rl.on('line', function (cmd) {
  console.log('You just typed: '+cmd);
});

现在我可以一次从stdin中读取行.快乐的日子.

Now I can read line-at-a-time from stdin. Happy days.

这篇关于node.js:从stdin读取readSync吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！