yall: Lenses with a southern twang
Why yet another lens library? First, none of the existing libraries for Lenses were adequate for my needs (specifically for my use of lenses in "pez"). And anyway, why not try to create something novel and better?
Distinguishing features:
Lenses are parameterized over two Monads (by convention
m
andw
), and look likea -> m (b -> w a, b)
. this lets us define lenses for sum types, that perform validation, that do IO (e.g. persist data to disk), etc., etc.a module Data.Yall.Iso that complements
Lens
powerfullya rich set of category-level class instances (for now from "categories") for
Lens
andIso
. These along with the pre-defined primitive lenses and combinators give an interface comparable to Arrow
You should import either Data.Yall or Data.Yall.Lens, and optionally Data.Yall.Iso. Data.Yall is a simplified, but mostly-compatible, version of a subset of Data.Yall.Lens.
UPDATE: I have stopped developing this package. Instead you should take a look at and contribute to http://hackage.haskell.org/package/lens
TODOs:
a module providing template haskell deriving of Lenses
pre-define lenses for prelude types, State
CHANGES:
depend on categories >= 1
Downloads
- yall-0.2.1.tar.gz [browse] (Cabal source package)
- Package description (as included in the package)
Maintainer's Corner
For package maintainers and hackage trustees
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Versions [RSS] | 0.1, 0.2, 0.2.0.1, 0.2.1 |
---|---|
Dependencies | base (>=4 && <5), categories (>=1.0), transformers [details] |
License | BSD-3-Clause |
Author | Brandon Simmons |
Maintainer | brandon.m.simmons@gmail.com |
Category | Data |
Home page | http://brandon.si/code/yall/ |
Source repo | head: git clone https://github.com/jberryman/yall.git -b master |
Uploaded | by BrandonSimmons at 2012-09-21T16:34:49Z |
Distributions | |
Reverse Dependencies | 2 direct, 0 indirect [details] |
Downloads | 3016 total (16 in the last 30 days) |
Rating | (no votes yet) [estimated by Bayesian average] |
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Status | Docs available [build log] Successful builds reported [all 1 reports] |