Parses the connection string.

class RedisConnectionSettings {

 final String connectionString;

 String hostname = "localhost";

 String password;

 int port = 6379;

 int db = 0;

 /// Parses provided connection string and sets the corresponding settings.
 ///
 /// See the [RedisConnection] class documentation on which connectionStrings
 /// are allowed.
 RedisConnectionSettings([ String this.connectionString ]) {
   if (connectionString == null || connectionString.isEmpty) return;

   List<String> parts = connectionString.split("@");

   if (parts.length == 2) password = parts.first;

   parts = parts.last.split(":");
   bool hasPort = parts.length == 2;

   hostname = parts.first;

   if (hasPort) {
     parts = parts.last.split("/");
     port = int.parse(parts.first);
     if (parts.length == 2) db = int.parse(parts.last);
   }
 }

}