-------- Original Message -------- Subject: Re: [Haskell-cafe] A home-brew iteration-alike library: some extension quiestions Date: Thu, 09 Dec 2010 23:07:49 +0300 From: Permjacov Evgeniy To: Antoine Latter On 12/09/2010 10:54 PM, Antoine Latter wrote:

I only have some surface level questions/comments -

What existing packages is this similar to? How is it different from any previous work in the area?

Main idea was taken from Iteratees invented by Oleg Kiselev (there are two packages on hackage implementing this ideas: data-iteraties and enumerator packages) The difference is, that I wished haskell-2010 compilant package for left-foldable streams, including support for easy builing, transcoding, merging and folding of streams relying on do-notation (see Data.Iteration.Unicode.* for examples of transcoding streams: it is quite clean and easily understandable) and ability to specify easily monadic actions in stream processors.

Also, likes looks like you don't need the 'Monad m' constraint on your various Monad and Functor instances in Data.Iteration.Types, which I think is one of the nicest properties of the continuation-based approach to something like this. Errgh. That may be true, but I did not consider non-monadic context at all, so I enforced this constrain mindlessly It's a mater of taste which way to go, but I prefer importing modules qualified rather than have type-suffixes on functions - so I would rather use 'I.next' and 'A.next' instead of 'nextI' and 'nextA'. But reasonable people can disagree on this.

Take care, Antoine Thanks! On Thu, Dec 9, 2010 at 1:42 PM, Permjacov Evgeniy wrote:

...

Hi. I Wrote a simple iteration library. It was not intensively tested, so it MAY contatin bugs, but it is very unlikely. The library is currently on github: https://github.com/permeakra/iteration

I'm not ready to upload it to hackage, as some testing and extension is really needed. However, I'd like to know about possible flaws.

Current goal is addition of byte-stream (de)compression and IO functions extenstion. After this package will be cabalized and uploaded to hackage. So, while design is not frozen yet, I'm interested in criticism -)/

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