[Haskell] Announce: iteratee-0.1.0
John Lato
library implements enumerators and iteratees as proposed by Oleg
Kiselyov (http://okmij.org/ftp/Haskell/Iteratee/). Significant
differences from his original code include:
- Seeking is allowed within any monad; the specific RBIO monad is
neither required nor provided.
- Data buffers may be of arbitrary types as specified by the
StreamChunk type class. This allows for user-provided buffer types
(e.g. arrays, vectors, etc.). Instances are provided for lists and
ByteStrings. This, in conjunction with seeking, allows for efficient
processing of binary data in addition to text.
- Cross-platform support. Currently this is slightly less efficient
than the Posix operations, but should run on any system targeted by a
Haskell compiler.
Although basic I/O specific enumerators are provided, this library
should allow seamless interoperation with user-provided iteratees and
enumerators. I hope that this flexibility will encourage a much wider
adoption of enumerator-based IO in the Haskell community.
This library is experimental, and the API is subject to change if it
will seem advantageous. Patches are welcome: the darcs repo is at
http://inmachina.net/~jwlato/haskell/iteratee . Discussion and
comments are also always welcome.
I would like to acknowledge several individuals for their
contributions and suggestions:
Oleg Kiselyov
Paulo Tanimoto
Johan Tibell
Cheers,
John Lato
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Johan Tibell
> I am pleased to announce the hackage release of iteratee-0.1.0. This
> library implements enumerators and iteratees as proposed by Oleg
> Kiselyov (http://okmij.org/ftp/Haskell/Iteratee/). Significant
> differences from his original code include:
>
> - Seeking is allowed within any monad; the specific RBIO monad is
> neither required nor provided.
> - Data buffers may be of arbitrary types as specified by the
> StreamChunk type class. This allows for user-provided buffer types
> (e.g. arrays, vectors, etc.). Instances are provided for lists and
> ByteStrings. This, in conjunction with seeking, allows for efficient
> processing of binary data in addition to text.
> - Cross-platform support. Currently this is slightly less efficient
> than the Posix operations, but should run on any system targeted by a
> Haskell compiler.
Here's the Hackage link for the lazy among us:
http://hackage.haskell.org/cgi-bin/hackage-scripts/package/iteratee-0.1.0
Cheers,
Johan
Paulo Tanimoto
> On Tue, Mar 10, 2009 at 8:28 PM, John Lato <jwl...@gmail.com> wrote:
>> I am pleased to announce the hackage release of iteratee-0.1.0. This
>> library implements enumerators and iteratees as proposed by Oleg
>> Kiselyov (http://okmij.org/ftp/Haskell/Iteratee/). Significant
>> differences from his original code include:
>>
>> - Seeking is allowed within any monad; the specific RBIO monad is
>> neither required nor provided.
>> - Data buffers may be of arbitrary types as specified by the
>> StreamChunk type class. This allows for user-provided buffer types
>> (e.g. arrays, vectors, etc.). Instances are provided for lists and
>> ByteStrings. This, in conjunction with seeking, allows for efficient
>> processing of binary data in addition to text.
>> - Cross-platform support. Currently this is slightly less efficient
>> than the Posix operations, but should run on any system targeted by a
>> Haskell compiler.
>
> Here's the Hackage link for the lazy among us:
>
> http://hackage.haskell.org/cgi-bin/hackage-scripts/package/iteratee-0.1.0
>
> Cheers,
>
> Johan
Nice job, John! Please keep posting on your blog, so we can see your
findings with audio processing and examples of iteratee.
If Windows users are interested, I just cabal-installed it on Windows
XP and the examples seem to run.
Paulo
Don Stewart
> On Tue, Mar 10, 2009 at 2:57 PM, Johan Tibell <johan....@gmail.com> wrote:
> > On Tue, Mar 10, 2009 at 8:28 PM, John Lato <jwl...@gmail.com> wrote:
> >> I am pleased to announce the hackage release of iteratee-0.1.0. This
> >> library implements enumerators and iteratees as proposed by Oleg
> >> Kiselyov (http://okmij.org/ftp/Haskell/Iteratee/). Significant
> >> differences from his original code include:
> >>
> >> - Seeking is allowed within any monad; the specific RBIO monad is
> >> neither required nor provided.
> >> - Data buffers may be of arbitrary types as specified by the
> >> StreamChunk type class. This allows for user-provided buffer types
> >> (e.g. arrays, vectors, etc.). Instances are provided for lists and
> >> ByteStrings. This, in conjunction with seeking, allows for efficient
> >> processing of binary data in addition to text.
> >> - Cross-platform support. Currently this is slightly less efficient
> >> than the Posix operations, but should run on any system targeted by a
> >> Haskell compiler.
> >
> > Here's the Hackage link for the lazy among us:
> >
> > http://hackage.haskell.org/cgi-bin/hackage-scripts/package/iteratee-0.1.0
> >
> > Cheers,
> >
> > Johan
>
> Nice job, John! Please keep posting on your blog, so we can see your
> findings with audio processing and examples of iteratee.
Would love to see performance/handle-scalability numbers, too!
John Lato
> On Tue, Mar 10, 2009 at 8:28 PM, John Lato <jwl...@gmail.com> wrote:
>
>
> I think it would be nice if you make Monoid a superclass of
> StreamChunk and remove the 'empty' and 'append' methods.
>
> I attached a darcs patch that does just that, adds the necessary
> Monoid instances and updates all code to work with Monoids.
>
Thanks very much for this; it looks great. Incidentally, one of the
items planned for iteratee is some restructuring of types, in
particular the StreamChunk class. I would very much like to make
further steps in this direction.
John