foldl-transduce: Transducers for foldl folds.

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Warnings:

'ghc-options: -O2' is rarely needed. Check that it is giving a real benefit and not just imposing longer compile times on your users.

Stateful transducers and streaming-preserving grouping operations for the folds in the foldl package.

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Properties

Versions	0.0.1, 0.1.0.0, 0.1.0.1, 0.1.2.0, 0.1.2.1, 0.1.2.1, 0.1.2.2, 0.1.2.3, 0.2.0.0, 0.2.1.0, 0.3.0.0, 0.4.0.0, 0.4.0.1, 0.4.1.0, 0.4.2.0, 0.4.3.0, 0.4.4.0, 0.4.5.0, 0.4.6.0, 0.4.7.0, 0.5.0.0, 0.5.1.0, 0.5.2.0, 0.6.0.0, 0.6.0.1
Change log	CHANGELOG
Dependencies	base (>=4 && <5), bifunctors (>=5 && <6), bytestring (>=0.9.2.1 && <0.11), comonad (>=4 && <5), containers (<0.6), foldl (>=1.1 && <2), semigroupoids (>=5.0), text (>=0.11.2.0 && <1.3), transformers (>=0.2.0.0 && <0.5) [details]
License	BSD-3-Clause
Copyright	2015 Daniel Diaz
Author	Daniel Diaz
Maintainer	diaz_carrete@yahoo.com
Category	Control
Bug tracker	https://github.com/danidiaz/foldl-transduce/issues
Source repo	head: git clone git@github.com:danidiaz/foldl-transduce.git
Uploaded	by DanielDiazCarrete at 2015-08-26T22:22:07Z

Modules

[Index]

Control
- Foldl
  - Control.Foldl.Transduce
    - Control.Foldl.Transduce.Internal
    - Control.Foldl.Transduce.Text

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foldl-transduce-0.1.2.1.tar.gz [browse] (Cabal source package)
Package description (as included in the package)

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Package maintainers

DanielDiazCarrete

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Readme for foldl-transduce-0.1.2.1

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What's in this library?

Stateful transducers and streaming-preserving group operations for the folds in Gabriel Gonzalez's foldl package.

When to use this library?

When you want to wrap a stateful decoder over a Fold. An example is decoding UTF-8: the decoder must be stateful because a multi-byte character may have been split across two blocks of bytes.
When you want to tweak the stream of data that arrives into a Fold, but only at certain positions. Stripping whitespace at the beginning of a text stream, for example.
When you want to perform group operations without breaking "streaminess", similar to what pipes-group does.

Why use this library for grouping instead of pipes-group?

Grouping fold-side instead of producer-side has the advantage that, since the results are still Folds, you can combine them using Applicative.

Also, Folds can work with sources other than Producers from pipes.

Grouping fold-side has limitations as well:

You can't perform bracketing operations like "withFile" that span the folding of an entire group. You can do that in pipes-group.
You have more flexibility in pipes-group to decide how to fold a group based on previous results.