Horde_Imap_Client_Socket::_getLine PHP Method

    protected function _getLine(Horde_Imap_Client_Interaction_Pipeline $pipeline)
    {
        $server = Horde_Imap_Client_Interaction_Server::create($this->_connection->read());
        switch (get_class($server)) {
            case 'Horde_Imap_Client_Interaction_Server_Continuation':
                $this->_responseCode($pipeline, $server);
                break;
            case 'Horde_Imap_Client_Interaction_Server_Tagged':
                $cmd = $pipeline->complete($server);
                if (is_null($cmd)) {
                    /* This indicates a "dangling" tagged response - it was either
                     * generated by an aborted previous pipeline object or is the
                     * result of spurious output by the server. Ignore. */
                    return $this->_getLine($pipeline);
                }
                if ($timer = $cmd->getTimer()) {
                    $this->_debug->info(sprintf('Command %s took %s seconds.', $cmd->tag, $timer));
                }
                $this->_responseCode($pipeline, $server);
                if (is_callable($cmd->on_success)) {
                    call_user_func($cmd->on_success);
                }
                break;
            case 'Horde_Imap_Client_Interaction_Server_Untagged':
                if (is_null($server->status)) {
                    $this->_serverResponse($pipeline, $server);
                } else {
                    $this->_responseCode($pipeline, $server);
                }
                break;
        }
        switch ($server->status) {
            case $server::BAD:
            case $server::NO:
                /* A tagged BAD response indicates that the tagged command caused
                 * the error. This information is unknown if untagged (RFC 3501
                 * [7.1.3]) - ignore these untagged responses.
                 * An untagged NO response indicates a warning; ignore and assume
                 * that it also included response text code that is handled
                 * elsewhere. Throw exception if tagged; command handlers can
                 * catch this if able to workaround this issue (RFC 3501
                 * [7.1.2]). */
                if ($server instanceof Horde_Imap_Client_Interaction_Server_Tagged) {
                    /* Check for a on_error callback. If function returns true,
                     * ignore the error. */
                    if (($cmd = $pipeline->getCmd($server->tag)) && is_callable($cmd->on_error) && call_user_func($cmd->on_error)) {
                        break;
                    }
                    throw new Horde_Imap_Client_Exception_ServerResponse(Horde_Imap_Client_Translation::r("IMAP error reported by server."), 0, $server, $pipeline);
                }
                break;
            case $server::BYE:
                /* A BYE response received as part of a logout command should be
                 * be treated like a regular command: a client MUST process the
                 * entire command until logging out (RFC 3501 [3.4; 7.1.5]). */
                if (empty($this->_temp['logout'])) {
                    $e = new Horde_Imap_Client_Exception(Horde_Imap_Client_Translation::r("IMAP Server closed the connection."), Horde_Imap_Client_Exception::DISCONNECT);
                    $e->details = strval($server);
                    throw $e;
                }
                break;
            case $server::PREAUTH:
                /* The user was pre-authenticated. (RFC 3501 [7.1.4]) */
                $this->_temp['preauth'] = true;
                break;
        }
        return $server;
    }