quote method

Implementation

String quote(String s) {
  String q = String.fromCharCode(34);
  String bs = String.fromCharCode(92);
  int total = s.length;
  String out = q;
  int start = 0;
  int k = 0;
  while (k < total) {
    int c = s.codeUnitAt(k);
    if ( (c == 34 || c == 92) || ((c == 10 || c == 13) || c == 9) ) {
      if ( k > start ) {
        out = out + s.substring(start, k );
      }
      if ( c == 34 ) {
        out = (out + bs) + q;
      }
      if ( c == 92 ) {
        out = (out + bs) + bs;
      }
      if ( c == 10 ) {
        out = (out + bs) + "n";
      }
      if ( c == 13 ) {
        out = (out + bs) + "r";
      }
      if ( c == 9 ) {
        out = (out + bs) + "t";
      }
      start = k + 1;
    }
    k = k + 1;
  }
  if ( total > start ) {
    out = out + s.substring(start, total );
  }
  return out + q;
}