[Haskell-cafe] ANNOUNCE: monoid-subclasses-0.1.1, incremental-parser-0.2.2, and SCC-0.8

[Alberto G. Corona]

Thanks

The cancelative monoid is the right class for rolling back transactions, by
the way.


2013/3/22 Mario Blažević <blamario at acanac.net>

>     The new package monoid-subclasses [1] exports a number of classes that
> sit between monoids and groups: ReductiveMonoid, CancellativeMonoid,
> GCDMonoid, MonoidNull, and FactorialMonoid among others. The package also
> comes with class instances for all applicable data types from base, vector,
> containers, bytestring, and text packages.
>
>     These classes were initially a part of the incremental-parser package
> [2] but they've moved, so incremental-parser-0.2.2 now depends on
> monoid-subclasses which has added more class methods and instances. The
> parsers constructed using the incremental-parser library generally work on
> any ReductiveMonoid, FactorialMonoid or TextualMonoid. You can thus
> construct a generic parser that operates on String, ByteString, or Text
> input, or even on Product Integer or a Map if you are so inclined.
>
>     The version 0.8 of Streaming Component Combinators (a.k.a. SCC) has
> also been re-designed from the ground up. In the earlier versions, as in
> the pipes and conduit packages, the types of streams and stream-processing
> components were
> parametrized by the type of the individual items flowing through. All
> sources and sinks are now parametrized instead by the type of the monoid
> they produce or consume. As a consequence, SCC coroutines can now
> communicate in chunks of
> ByteString or Text instead of just lists, and these chunks can be of
> arbitrary size. The boundaries of producer's chunks are invisible to the
> consumer (excepting some low-level functions), which must specify the
> amount of data it wants to receive using a ReadRequest. This change at the
> heart of SCC has had a positive impact on outer layers, and especially on
> the Splitter component type which has become much simpler.
>
> [1] http://hackage.haskell.org/**package/monoid-subclasses-0.1.**1<http://hackage.haskell.org/package/monoid-subclasses-0.1.1>
> [2] http://hackage.haskell.org/**package/incremental-parser-0.**2.2<http://hackage.haskell.org/package/incremental-parser-0.2.2>
> [3] http://hackage.haskell.org/**package/scc-0.8<http://hackage.haskell.org/package/scc-0.8>
>
>
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-- 
Alberto.
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