sql bracket woes

an example of nightmares in brackets:

IF EXISTS (SELECT 1 FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[xx]') AND type in (N'U'))

drop table xx

go

create table x (x int)

EXEC sp_rename '[dbo].[x]', '[dbo].[xx]';

IF EXISTS (SELECT 1 FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[[dbo]].[xx]]]') AND type in (N'U'))

EXEC sp_rename '[dbo].[[dbo]].[xx]]]', 'xx';

GO