function decodeString()

in Events and Hacks/Tech Talks/ContainerDemo/example-voting-app/result/views/socket.io.js [5961:6022]

• 56 lines of code
• 21 McCabe index (conditional complexity)

function decodeString(str) {
  var p = {};
  var i = 0;

  // look up type
  p.type = Number(str.charAt(0));
  if (null == exports.types[p.type]) return error();

  // look up attachments if type binary
  if (exports.BINARY_EVENT == p.type || exports.BINARY_ACK == p.type) {
    var buf = '';
    while (str.charAt(++i) != '-') {
      buf += str.charAt(i);
      if (i == str.length) break;
    }
    if (buf != Number(buf) || str.charAt(i) != '-') {
      throw new Error('Illegal attachments');
    }
    p.attachments = Number(buf);
  }

  // look up namespace (if any)
  if ('/' == str.charAt(i + 1)) {
    p.nsp = '';
    while (++i) {
      var c = str.charAt(i);
      if (',' == c) break;
      p.nsp += c;
      if (i == str.length) break;
    }
  } else {
    p.nsp = '/';
  }

  // look up id
  var next = str.charAt(i + 1);
  if ('' !== next && Number(next) == next) {
    p.id = '';
    while (++i) {
      var c = str.charAt(i);
      if (null == c || Number(c) != c) {
        --i;
        break;
      }
      p.id += str.charAt(i);
      if (i == str.length) break;
    }
    p.id = Number(p.id);
  }

  // look up json data
  if (str.charAt(++i)) {
    try {
      p.data = json.parse(str.substr(i));
    } catch(e){
      return error();
    }
  }

  debug('decoded %s as %j', str, p);
  return p;
}