Created
March 23, 2019 17:32
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| {-# LANGUAGE RankNTypes #-} | |
| {-# LANGUAGE TypeFamilies #-} | |
| {-# LANGUAGE FlexibleInstances #-} | |
| {-# LANGUAGE LambdaCase #-} | |
| {-# LANGUAGE GADTs #-} | |
| {-# LANGUAGE TemplateHaskell #-} | |
| import Control.Lens | |
| import Reflex.Patch | |
| import Data.Dependent.Sum | |
| data MyRecord = MyRecord | |
| { _myField_1 :: Int | |
| , _myField_2 :: String | |
| } deriving (Eq, Ord, Show) | |
| makeLenses 'MyRecord | |
| data MyRecordPatch a where | |
| MyField_1 :: MyRecordPatch Int | |
| MyField_2 :: MyRecordPatch String | |
| myRecordOptics :: MyRecordPatch a -> Lens' MyRecord a | |
| myRecordOptics = \case | |
| MyField_1 -> myField_1 | |
| MyField_2 -> myField_2 | |
| instance Patch (DSum MyRecordPatch Identity) where | |
| type PatchTarget (DSum MyRecordPatch Identity) = MyRecord | |
| apply p t = Just $ case p of | |
| (field :=> Identity x) -> set (myRecordOptics field) x t |
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