function wbUuidsToCwl(obj) {
  if (obj instanceof Array) {
    const res = [];
    for (let k in obj) {
        res[k] = uuidsToCwl(obj[k]);
    }
    return res;
  }

  if (typeof(obj) === 'string' &&
    (/^[0-9a-z]{5}-[0-9a-z]{5}-[0-9a-z]{15}/.exec(obj) ||
      /^[0-9a-f]{32}\+[0-9]+/.exec(obj))) {

    const isDirectory = obj.endsWith('/');

    return {
      'class': (isDirectory ? 'Directory' : 'File'),
      'location': 'keep:' + (isDirectory ? obj.substr(0, obj.length - 1) : obj)
    };
  }

  throw Error('Expected Arvados path or array of paths');
}

export default wbUuidsToCwl;