code: function readLine()
      {
          $i = $this->pos;
          $tot_len = strlen($this->data);
          while ($i<$tot_len && !$this->isEndOfLine($i)) {
              $i++;
          }
  
          $result = substr($this->data,$this->pos,$i-$this->pos);
          $i++;   //skip first EOL char
          if ($this->getLineEndingModeCrlf()) $i++;  //skip second EOL char if needed
          $this->pos=$i;  //update position
          return $result;
      }
docs: Reads a line from this reader, ended by a CR or CRLF.
  
  @return string the readed line.
  @throws \Mbcraft\Piol\IOException if this reader is already closed.
  
  @api