arff

ARFF parsing and formatting

Install

Download manually or with package-manager.

npm

> npm install --save exec-promise

Usage

var arff = require('arff');

Parsing

var readFile = require('fs').readFile;
 
readFile('data.arff', 'utf8', function (error, content) {
  if (error) {
    return console.error(error);
  }
 
  console.log(arff.parse(content));
});

For the folling data.arff:

% My ARFF file.
@RELATION user
 
@ATTRIBUTE name       STRING
@ATTRIBUTE lastSignIn DATE
@ATTRIBUTE group      {none,read,write,admin}
 
@DATA
root,?,admin
julien-f,2014-12-16T19:42:01,write

It will give this output:

{
  relation: 'user',
  attributes: [
    {
      name: 'name',
      type: 'string'
    },
    {
      name: 'lastSignIn',
      type: 'date'
    },
    {
      name: 'name',
      type: 'enum',
      values: [
        'none',
        'read',
        'write',
        'admin'
      ]
    }
  ],
  data: [
    {
      name: 'root',
      group: 'admin'
    },
    {
      name: 'julien-f',
      lastSignIn: '2014-12-16T19:42:01',
      group: 'write'
    }
  ]
}

Formatting

console.log(arff.format(require('./relation')));

Which will display:

@RELATION foo
 
@ATTRIBUTE date date
@ATTRIBUTE dateWithFormat date "MM/DD/YY"
@ATTRIBUTE numeric numeric
@ATTRIBUTE string string
@ATTRIBUTE enumerate {"foo","bar","baz"}
 
@DATA
"2014-12-16T19:42:01+00:00","06/23/15",3.259,"can have spaces","bar"
"2014-12-16T19:42:01+00:00",?,42,?,?

Contributing

Contributions are very welcome, either on the documentation or on the code.

You may:

• report any issue you've encountered;
• fork and create a pull request.

License

ISC © Julien Fontanet