data-layer (empty) → 1.0
raw patch · 6 files changed
+414/−0 lines, 6 filesdep +basedep +lenssetup-changed
Dependencies added: base, lens
Files
- LICENSE +202/−0
- Setup.hs +2/−0
- data-layer.cabal +53/−0
- src/Data/Layer.hs +57/−0
- src/Data/Layer/Coat.hs +76/−0
- src/Data/Layer/Immersed.hs +24/−0
+ LICENSE view
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+ Setup.hs view
@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain
+ data-layer.cabal view
@@ -0,0 +1,53 @@+name: data-layer+version: 1.0+synopsis: Data layering utilities. Layer is a data-type which wrapps other one, but keeping additional information. If you want to access content of simple newtype object, use Lens.Wrapper instead. +-- description: +license: Apache-2.0+license-file: LICENSE+author: Wojciech Danilo+maintainer: Wojciech Danilo <wojciech.danilo@gmail.com>+stability: experimental+homepage: https://github.com/wdanilo/layer+bug-reports: https://github.com/wdanilo/layer/issues+copyright: Copyright (C) 2015 Wojciech Danilo+category: Text+build-type: Simple+-- extra-source-files: +cabal-version: >=1.10+++Library+ hs-source-dirs: src+ ghc-options: -Wall -O2+ default-language: Haskell2010++ default-extensions: ConstraintKinds+ DataKinds+ DefaultSignatures+ DeriveDataTypeable+ DeriveFoldable+ DeriveFunctor+ DeriveGeneric+ DeriveTraversable+ DoAndIfThenElse+ EmptyDataDecls+ FlexibleContexts+ FlexibleInstances+ GeneralizedNewtypeDeriving+ InstanceSigs+ LambdaCase+ MultiParamTypeClasses+ OverloadedStrings+ StandaloneDeriving+ TemplateHaskell+ TupleSections+ TypeOperators+ ViewPatterns+ TypeFamilies+ + exposed-modules: Data.Layer+ Data.Layer.Coat+ Data.Layer.Immersed++ build-depends: base >=4.6 && <4.9+ , lens
+ src/Data/Layer.hs view
@@ -0,0 +1,57 @@+module Data.Layer where++import Prelude+import Control.Lens+import Control.Monad+++-- === Data Layering ===++type family Unlayered l+++-- Non-monadic interface++class Layered l where+ layered :: Lens' l (Unlayered l)+ default layered :: (Unlayered l ~ Unwrapped l, Wrapped l) => Lens' l (Unlayered l)+ layered = _Wrapped'++class Layered l => IsLayer l where+ layer :: Unlayered l -> l++unlayer :: Layered l => l -> Unlayered l+unlayer = view layered+++-- Monadic interface++class LayeredM m l where+ viewLayeredM :: l -> m (Unlayered l)+ default viewLayeredM :: (Layered l, Monad m) => l -> m (Unlayered l)+ viewLayeredM = return . unlayer++ setLayeredM :: Unlayered l -> l -> m l+ default setLayeredM :: (Layered l, Monad m) => Unlayered l -> l -> m l+ setLayeredM = (fmap . fmap) return $ set layered++class LayeredM m l => IsLayerM m l where+ layerM :: Unlayered l -> m l+ default layerM :: (IsLayer l, Monad m) => Unlayered l -> m l+ layerM = return . layer++unlayerM :: LayeredM m l => l -> m (Unlayered l)+unlayerM = viewLayeredM++withLayeredM :: (LayeredM m a, Monad m) => (Unlayered a -> m (Unlayered a)) -> a -> m a+withLayeredM f l = viewLayeredM l >>= f >>= flip setLayeredM l++withLayeredM' :: (LayeredM m a, Monad m) => (Unlayered a -> Unlayered a) -> a -> m a+withLayeredM' = withLayeredM . (return .)+++-- === Layer generators ===++class LayerGen m l where genLayer :: Unlayered l -> m l++
+ src/Data/Layer/Coat.hs view
@@ -0,0 +1,76 @@+{-# LANGUAGE UndecidableInstances #-}++module Data.Layer.Coat where++import Prelude+import Control.Lens+import Control.Monad+import Data.Layer+++-- === Coat ===++newtype Coat a = Coat a deriving (Show, Functor, Foldable, Traversable)+type instance Unlayered (Coat a) = a++type family Uncoated a where Uncoated (Coat a) = a+ Uncoated a = Uncoated (Unlayered a)++-- Instances++instance Layered (Coat a)+instance Rewrapped (Coat a) (Coat a')+instance Wrapped (Coat a) where+ type Unwrapped (Coat a) = a+ _Wrapped' = iso (\(Coat a) -> a) Coat++++-- === Coated ===++-- pure interface++class Coated a where coated :: Lens' a (Uncoated a)+instance {-# OVERLAPPABLE #-} ( Layered a+ , Coated (Unlayered a)+ , Uncoated a ~ Uncoated (Unlayered a)+ ) => Coated a where coated = layered . coated+instance {-# OVERLAPPABLE #-} Coated (Coat a) where coated = _Wrapped'++uncoat :: Coated a => a -> Uncoated a+uncoat = view coated+++-- monadic interface++class CoatedM m a where viewCoatedM :: a -> m (Uncoated a)+ setCoatedM :: Uncoated a -> a -> m a++instance {-# OVERLAPPABLE #-} ( Monad m+ , LayeredM m a+ , CoatedM m (Unlayered a)+ , Uncoated a ~ Uncoated (Unlayered a)+ ) => CoatedM m a where viewCoatedM = viewLayeredM >=> viewCoatedM+ setCoatedM = withLayeredM . setCoatedM+instance {-# OVERLAPPABLE #-} Monad m => CoatedM m (Coat a) where viewCoatedM = return . uncoat+ setCoatedM v = return . set coated v+++-- === Coat generator ===++class CoatGen m a where genCoat :: Uncoated a -> m a+instance {-# OVERLAPPABLE #-} ( Monad m+ , Uncoated (Unlayered a) ~ Uncoated a+ , CoatGen m (Unlayered a)+ , LayerGen m a+ ) => CoatGen m a where genCoat = genCoat >=> genLayer+instance {-# OVERLAPPABLE #-} Monad m => CoatGen m (Coat a) where genCoat = return . Coat+++--class Destruction m a where destroy :: a -> m (Uncoated a)+--instance {-# OVERLAPPABLE #-} Monad m => Destruction m (Coat a) where destroy = return . unlayer+--instance {-# OVERLAPPABLE #-} Monad m => Destruction m (Coat a) where destroy = return . unlayer++--type family Deconstructed a+--class Construction m a where construct :: Deconstructed a -> m a+--class Deconstruction m a where deconstruct :: a -> m (Deconstructed a)
+ src/Data/Layer/Immersed.hs view
@@ -0,0 +1,24 @@+module Data.Layer.Immersed where+++import Prelude++import Control.Lens+import Control.Monad+import Data.Layer++++-- === Immersed layers ===++-- Non-monadic interface++class Immersed l a where immersed :: Lens' l a+instance {-# OVERLAPPABLE #-} Immersed l l where immersed = id+instance {-# OVERLAPPABLE #-} (Layered l, Immersed (Unlayered l) a) => Immersed l a where immersed = layered . immersed++-- Monadic interface++class ImmersedM l m a where viewImmersedM :: l -> m a+instance {-# OVERLAPPABLE #-} (Monad m) => ImmersedM l m l where viewImmersedM = return+instance {-# OVERLAPPABLE #-} (Monad m, LayeredM m l, ImmersedM (Unlayered l) m a) => ImmersedM l m a where viewImmersedM = viewLayeredM >=> viewImmersedM