Monthly Downloads: 27
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Control     Foldl    
Latest version: v0.6.0.0

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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. pipes-group allows them.

  • You have more flexibility in pipes-group to decide how to delimit and fold the next group based on previous results.

Where can I find working examples for this library?

In the examples folder of the repo.