Question

我有以下Parser：

function Parser(options) {
  options = options || {};

  // options.objectMode = true;
  options.encoding = 'utf8';

  Transform.call(this, options);

  this._rawHeader = [];
  this.header = null;
}

util.inherits(Parser, Transform);

Parser.prototype._transform = function(data, encoding, done) {
  this.push(this._parseRow(data));
  done();
};

// Parse a data row into an object
Parser.prototype._parseRow = function(row) {
  var fields = row.split(";");
  var obj = { code: fields[0], name: fields[1].trim() };
  return obj.toString();
};


var parser = new Parser({});

// Pipe the streams
process.stdin
  .pipe(parser)
  .pipe(process.stdout);

但是，我明白了：

ACARIT21012;CASSA RURA has no method 'split'
    at Parser._parseRow (/Users/pmu/projects/b/s/lib/parser.js:38:20)
    at Parser._transform (/Users/pmu/projects/b/s/lib/parser.js:32:18)
    at Parser.Transform._read (_stream_transform.js:179:10)
    at Parser.Transform._write (_stream_transform.js:167:12)
    at doWrite (_stream_writable.js:219:10)
    at writeOrBuffer (_stream_writable.js:209:5)
    at Parser.Writable.write (_stream_writable.js:180:11)
    at write (_stream_readable.js:573:24)
    at flow (_stream_readable.js:582:7)
    at Socket.pipeOnReadable (_stream_readable.js:614:5)

我怀疑流已损坏，但不确定如何防止这种情况发生

Answer 1

传递给Readable信息流的数据是Buffer个对象，而不是String。 Buffer没有split方法。您必须手动调用数据toString()才能将其作为String进行操作。

Parser.prototype._transform = function(data, encoding, done) {
  this.push(this._parseRow(data.toString()));
  done();
};

如何使用流解析节点中的CSV？

1 个答案: