Problem with incomplete input when using Attoparsec

Question

I am converting some functioning Haskell code that uses Parsec to instead use Attoparsec in the hope of getting better performance. I have made the changes and everything c

Answer 1

You give quite little information which is why I think it is hard to give you good help. However there are a couple of comments I would like to give:

• Perhaps the parser don't realize that the input is done and it hinges on either getting an EOL or getting another record. Hence it asks for a partial result. Try feeding it the equivalent of EOL in the hope it forces it.
• I can't remember the code, but using the Alternative instance might be detrimental to parsing performance. If that is the case, you may want to case on the comment and recordTypes.
• I use cereal for a lot of binary parsing and that is also extremely fast. attoparsec seems better as a text-parser though. You should definitely consider the option.
• Another option is to use iteratee-based IO in the longer run. John Lato did an excellent article on iteratees in the latest monad reader (issue #16 I believe). The end-of-line condition is the iteratees to signal. Beware though that the iteratee types are quite daunting and take some time getting used to.