2009/08/19 Jason Dusek <[email protected]>:
> Aha. From `Data.ByteString.Lazy` we have:
>
> null :: ByteString -> Bool
> null Empty = True
> null _ = False
>
> So either users need to norm ByteStrings before testing
> them for emptiness or it needs to happen within the ByteString
> code...
Well, no, actually -- the lazy `ByteString` constructors are
all supposed to conform to the invariant that there are no
empty chunks. So something is funny with AttoParsec:
Prelude Data.ParserCombinators.Attoparsec.Char8
Data.ByteString.Lazy.Char8> parse (takeTill (== '"')) (pack "\"\"")
(Chunk "\"" Empty,Right (Chunk "" Empty))
it :: (ByteString, Either ParseError ByteString)
Sorry to hash this out on the list; I'm used to think of my
troubles with Haskell libs as misunderstandings on my part.
I'll have to look into what AttoParsec is doing and file a bug
report.
--
Jason Dusek
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