Amqp.Address.Parse C# (CSharp) Method

        void Parse(string address)
        {
            //  amqp[s]://user:[email protected]:port/foo/bar
            ParseState state = ParseState.Scheme;
            int startIndex = 0;
            for (int i = 0; i < address.Length; ++i)
            {
                switch (address[i])
                {
                    case ':':
                        if (state == ParseState.Scheme)
                        {
                            this.Scheme = address.Substring(startIndex, i - startIndex);
                            state = ParseState.Slash1;
                        }
                        else if (state == ParseState.User)
                        {
                            this.User = address.Substring(startIndex, i - startIndex);
                            state = ParseState.Password;
                            startIndex = i + 1;
                        }
                        else if (state == ParseState.Host)
                        {
                            this.Host = address.Substring(startIndex, i - startIndex);
                            state = ParseState.Port;
                            startIndex = i + 1;
                        }
                        else
                        {
                            throw new AmqpException(ErrorCode.InvalidField,
                                Fx.Format(SRAmqp.InvalidAddressFormat));
                        }
                        break;
                    case '/':
                        if (state == ParseState.Slash1)
                        {
                            state = ParseState.Slash2;
                        }
                        else if (state == ParseState.Slash2)
                        {
                            state = ParseState.User;
                            startIndex = i + 1;
                        }
                        else if (state == ParseState.User || state == ParseState.Host)
                        {
                            this.Host = address.Substring(startIndex, i - startIndex);
                            state = ParseState.Path;
                            startIndex = i;
                        }
                        else if (state == ParseState.Port)
                        {
                            this.Port = int.Parse(address.Substring(startIndex, i - startIndex));
                            state = ParseState.Path;
                            startIndex = i;
                        }
                        else if (state == ParseState.Password)
                        {
                            this.Host = this.User;
                            this.User = null;
                            this.Port = int.Parse(address.Substring(startIndex, i - startIndex));
                            state = ParseState.Path;
                            startIndex = i;
                        }
                        break;
                    case '@':
                        if (state == ParseState.Password)
                        {
                            this.Password = address.Substring(startIndex, i - startIndex);
                            state = ParseState.Host;
                            startIndex = i + 1;
                        }
                        else
                        {
                            throw new AmqpException(ErrorCode.InvalidField,
                                Fx.Format(SRAmqp.InvalidAddressFormat));
                        }
                        break;
                    default:
                        break;
                }

                if (state == ParseState.Path)
                {
                    this.Path = address.Substring(startIndex);
                    break;
                }
            }

            // check state in case of no trailing slash
            if (state == ParseState.User || state == ParseState.Host)
            {
                this.Host = address.Substring(startIndex);
            }
            else if (state == ParseState.Password)
            {
                this.Host = this.User;
                this.User = null;
                if (startIndex < address.Length - 1)
                {
                    this.Port = int.Parse(address.Substring(startIndex));
                }
            }
            else if (state == ParseState.Port)
            {
                this.Port = int.Parse(address.Substring(startIndex));
            }

            if (this.Password != null && this.Password.Length > 0)
            {
                this.Password = Uri.UnescapeDataString(this.Password);
            }

            if (this.User != null && this.User.Length > 0)
            {
                this.User = Uri.UnescapeDataString(this.User);
            }

            if (this.Host != null)
            {
                this.Host = Uri.UnescapeDataString(this.Host);
            }
        }