attenuation-profunctors (empty) → 0.1.0

raw patch · 5 files changed

+326/−0 lines, 5 filesdep +attenuationdep +basedep +constraints

Dependencies added: attenuation, base, constraints, profunctors

Files

• CHANGELOG.md +3/−0
• LICENSE +202/−0
• README.md +12/−0
• attenuation-profunctors.cabal +40/−0
• src/Data/Type/Attenuation/Profunctor.hs +69/−0

@@ -0,0 +1,3 @@+# 0.1.0++* Add `profunctors` support split off from the core `attenuation` package.

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@@ -0,0 +1,12 @@+# attenuation-profunctors++Attenuation support for `profunctors`.++## Overview++This package provides functions for lifting `Attenuation`s across+`Profunctor`s, along with entailments for obtaining the related instances.++This is in a separate package from the rest of `attenuation` because+`profunctors` is a very heavy dependency, and the core functionality doesn't+need it.

@@ -0,0 +1,40 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.34.4.+--+-- see: https://github.com/sol/hpack++name:           attenuation-profunctors+version:        0.1.0+synopsis:       Attenuation support for Profunctors.+description:    This provides functions and @Attenuation@s for @profunctors@.  See the+                <#readme README.md>.+category:       Constraints+homepage:       https://github.com/google/hs-attenuation#readme+bug-reports:    https://github.com/google/hs-attenuation/issues+author:         Andrew Pritchard <awpr@google.com>+maintainer:     Andrew Pritchard <awpr@google.com>+copyright:      2020-2021 Google LLC+license:        Apache-2.0+license-file:   LICENSE+build-type:     Simple+extra-source-files:+    CHANGELOG.md+    README.md++source-repository head+  type: git+  location: https://github.com/google/hs-attenuation+  subdir: attenuation-profunctors++library+  exposed-modules:+      Data.Type.Attenuation.Profunctor+  hs-source-dirs:+      src+  build-depends:+      attenuation ==0.2.*+    , base >=4.12 && <4.16+    , constraints >=0.10 && <0.14+    , profunctors >=0.1 && <5.7+  default-language: Haskell2010

@@ -0,0 +1,69 @@+-- Copyright 2020-2021 Google LLC+--+-- Licensed under the Apache License, Version 2.0 (the "License");+-- you may not use this file except in compliance with the License.+-- You may obtain a copy of the License at+--+--      http://www.apache.org/licenses/LICENSE-2.0+--+-- Unless required by applicable law or agreed to in writing, software+-- distributed under the License is distributed on an "AS IS" BASIS,+-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.+-- See the License for the specific language governing permissions and+-- limitations under the License.++{-# LANGUAGE RankNTypes #-}+{-# LANGUAGE QuantifiedConstraints #-}+{-# LANGUAGE TypeOperators #-}++-- | 'Attenuation's for 'Profunctor's.++module Data.Type.Attenuation.Profunctor+         ( -- * Profunctor Attenuations+           lcontra, rco, profunctoriality+         ) where++import Prelude hiding ((.))++import Control.Category ((.))++import Data.Constraint ((:-)(Sub), Dict(..))+import Data.Profunctor (Profunctor)+import Data.Type.Attenuation+         ( Attenuation, Attenuable+         , Variance, Representational0, Representational1+         , coer, attenuation, withAttenuation+         )+import Data.Type.Attenuation.Internal (Attenuation(..), rep0, rep)+import Data.Type.Coercion (sym)++-- | Lift an 'Attenuation' contravariantly over the left of a 'Profunctor'.+--+-- Similarly to the use of 'Data.Functor.Contravariant.Contravariant' in+-- 'Data.Type.Attenuation.contra', we use 'Profunctor' to guarantee+-- contravariance in the appropriate parameter.+lcontra :: (Profunctor p, Representational0 p) => Variance (p b x) (p a x) a b+lcontra (Attenuation c) = coer (sym $ rep0 c)++-- | Lift an 'Attenuation' covariantly over the right of a 'Profunctor'.+--+-- Similarly to the use of 'Functor' in 'Data.Type.Attenuation.co', we use+-- 'Profunctor' to guarantee covariance in the appropriate parameter.+--+-- As with 'Data.Type.Attenuation.sndco', this functions the same as+-- 'Data.Type.Attenuation.co', but the needed 'Functor' instance might not be+-- available in polymorphic contexts.+rco :: (Profunctor p, Representational1 p) => Variance (p x a) (p x b) a b+rco (Attenuation c) = coer (rep c)++-- Type inference aid for use in entailments: otherwise it's ambiguous what+-- 'Attenuation' we want to promote with 'withAttenuation'.+toDict :: Attenuation a b -> Dict (Attenuable a b)+toDict att = withAttenuation att Dict++-- | 'Profunctor's map attenuations profunctorially.+profunctoriality+  :: forall p a b c d+   . (Representational0 p, Representational1 p, Profunctor p)+  => (Attenuable a c, Attenuable b d) :- Attenuable (p c b) (p a d)+profunctoriality = Sub (toDict (rco attenuation . lcontra attenuation))