derive-lifted-instances (empty) → 0

raw patch · 7 files changed

+600/−0 lines, 7 filesdep +basedep +template-haskell

Dependencies added: base, template-haskell

Files

• CHANGELOG.md +4/−0
• Data/DeriveLiftedInstances.hs +118/−0
• Data/DeriveLiftedInstances/Internal.hs +186/−0
• LICENSE +201/−0
• README.md +1/−0
• derive-lifted-instances.cabal +34/−0
• examples/Test.hs +56/−0

@@ -0,0 +1,4 @@+# Changelog++## v0 2020-06-20+  - First release

@@ -0,0 +1,118 @@+{-# LANGUAGE ViewPatterns #-}+{-# LANGUAGE TemplateHaskell #-}+{-# OPTIONS_GHC -fno-warn-orphans #-}+-----------------------------------------------------------------------------+-- |+-- Module      :  Data.DeriveLiftedInstances+-- Copyright   :  (c) Sjoerd Visscher 2020+--+-- Maintainer  :  sjoerd@w3future.com+-- Stability   :  experimental+-- Portability :  non-portable+-----------------------------------------------------------------------------+module Data.DeriveLiftedInstances (+  -- * Deriving instances+  deriveInstance,+  -- * Derivators for any class+  idDeriv, newtypeDeriv, isoDeriv,+  -- * Derivators for algebraic classes+  -- $algebraic-classes+  apDeriv, tupleDeriv, unitDeriv,+  showDeriv, ShowsPrec(..),+  -- * Creating derivators+  Derivator(..)+) where++import Language.Haskell.TH+import Data.DeriveLiftedInstances.Internal+import Control.Arrow ((***))+import Control.Applicative (liftA2)++-- $algebraic-classes+-- Algebraic classes are type classes where all the methods return a value of the same type, which is also the class parameter.+-- Examples from base are `Num` and `Monoid`.++-- | Given how to derive an instance for @a@, `apDeriv` creates a `Derivator` for @f a@,+-- when @f@ is an instance of `Applicative`. Example:+--+-- @+-- `deriveInstance` (`apDeriv` `idDeriv`) [t| forall a. `Num` a => `Num` [a] |]+--+-- > [2, 3] `*` [5, 10]+-- [10, 20, 15, 30]+-- @+apDeriv :: Derivator -> Derivator+apDeriv deriv = deriv {+  res = \v -> [| fmap (\w -> $(res deriv [| w |])) $v |],+  op  = \nm o -> [| pure $(op deriv nm o) |],+  arg = \ty e -> [| pure $(arg deriv ty e) |],+  var = \fold v ->+    [| fmap (\w -> $(var deriv fold [| w |])) ($(fold [| traverse |] [| id |]) $v) |],+  ap  = \f a -> [| liftA2 (\g b -> $(ap deriv [| g |] [| b |])) $f $a |]+}++-- | Given how to derive an instance for @a@ and @b@, `tupleDeriv` creates a `Derivator` for @(a, b)@.+--+-- @+-- `deriveInstance` (`tupleDeriv` `idDeriv` `idDeriv`) [t| forall a b. (`Num` a, `Num` b) => `Num` (a, b) |]+--+-- > (2, 3) `*` (5, 10)+-- (10, 30)+-- @+tupleDeriv :: Derivator -> Derivator -> Derivator+tupleDeriv l r = idDeriv {+  res = \e -> [| ((\w -> $(res l [| w |])) *** (\w -> $(res r [| w |]))) $e |],+  op  = \nm o -> [| ($(op l nm o), $(op r nm o)) |],+  arg = \ty e -> [| ($(arg l ty e), $(arg r ty e)) |],+  var = \fold v ->+    [| ( $(var l fold [| $(fold [| fmap |] [| fst |]) $v |])+       , $(var r fold [| $(fold [| fmap |] [| snd |]) $v |])+       ) |],+  ap  = \f a  -> [| case ($f, $a) of ((g, h), (b, c)) -> ($(ap l [| g |] [| b |]), $(ap r [| h |] [| c |])) |]+}++-- | A `Derivator` for @()@.+unitDeriv :: Derivator+unitDeriv = idDeriv {+  op = \_ _ -> [| () |],+  ap = const+}++-- | Given how to derive an instance for @a@, and the names of a newtype wrapper around @a@,+-- `newtypeDeriv` creates a `Derivator` for that newtype. Example:+--+-- @+-- newtype Ap f a = Ap { getAp :: f a } deriving Show+-- `deriveInstance` (`newtypeDeriv` 'Ap 'getAp `idDeriv`) [t| forall f. `Functor` f => `Functor` (Ap f) |]+--+-- > `fmap` (+1) (Ap [1,2,3])+-- Ap {getAp = [2,3,4]}+-- @+newtypeDeriv :: Name -> Name -> Derivator -> Derivator+newtypeDeriv mk un = isoDeriv (pure $ ConE mk) (pure $ VarE un)++-- | Given how to derive an instance for @a@, and two functions of type @a `->` b@ and @b `->` a@,+-- `isoDeriv` creates a `Derivator` for @b@. (Note that the 2 functions don't have to form+-- an isomorphism, but if they don't, the new instance can break the class laws.) Example:+--+-- @+-- newtype X = X { unX :: `Int` } deriving `Show`+-- mkX :: `Int` -> X+-- mkX i = X (`mod` i 10)+-- `deriveInstance` (isoDeriv [| mkX |] [| unX |] `idDeriv`) [t| `Num` X |]+--+-- > mkX 4 `^` 2+-- X {unX = 6}+-- @+isoDeriv :: Q Exp -> Q Exp -> Derivator -> Derivator+isoDeriv mk un deriv = deriv {+  res = \v -> [| $mk $(res deriv v) |],+  var = \fold v -> var deriv fold [| $(fold [| fmap |] un) $v |]+}++deriveInstance showDeriv [t| Bounded ShowsPrec |]+deriveInstance showDeriv [t| Num ShowsPrec |]+deriveInstance showDeriv [t| Fractional ShowsPrec |]+deriveInstance showDeriv [t| Floating ShowsPrec |]+deriveInstance showDeriv [t| Semigroup ShowsPrec |]+deriveInstance showDeriv [t| Monoid ShowsPrec |]

@@ -0,0 +1,186 @@+{-# LANGUAGE DeriveLift #-}+{-# LANGUAGE LambdaCase #-}+{-# LANGUAGE TupleSections #-}+{-# LANGUAGE TemplateHaskell #-}+{-# LANGUAGE RecordWildCards #-}+{-# LANGUAGE StandaloneDeriving #-}+{-# OPTIONS_GHC -fno-warn-orphans #-}+-----------------------------------------------------------------------------+-- |+-- Module      :  Data.DeriveLiftedInstances.Internal+-- Copyright   :  (c) Sjoerd Visscher 2020+--+-- Maintainer  :  sjoerd@w3future.com+-- Stability   :  experimental+-- Portability :  non-portable+-----------------------------------------------------------------------------+module Data.DeriveLiftedInstances.Internal where++import Language.Haskell.TH+import Language.Haskell.TH.Syntax (Lift)+import Data.Char (isAlpha)+import Data.Data (Data, gmapQl, cast)+import Data.Maybe (fromMaybe, catMaybes)+import Data.Traversable (for)+++-- | To write your own `Derivator` you need to show how each part of a method gets lifted.+-- For example, when deriving an instance for type @a@ of the following methods:+--+-- @+-- meth0 :: a+-- meth1 :: Int -> a+-- meth2 :: a -> Either Bool a -> Int+-- meth3 :: Maybe [a] -> a+-- @+--+-- the resulting template haskell declarations are (pseudo code):+--+-- @+-- meth0 = $res ($op "meth0" meth0)+-- meth1 a = $res (($op "meth1" meth1) `$ap` ($arg Int a))+-- meth2 v0 v1 = (($op "meth2" meth2) `$ap` ($var fold0 v0)) `$ap` ($var fold1 v1)+--   where+--     fold0 _ f = f+--     fold1 map f = [| $map $f |]+-- meth3 v2 = $res (($op "meth2" meth2) `$ap` ($var fold2 v2))+--   where+--     fold2 map f = [| $map ($map $f) |]+-- @+data Derivator = Derivator {+  res :: Q Exp -> Q Exp, -- ^ Convert the result of the method+  op  :: Name -> Q Exp -> Q Exp, -- ^ Convert the method (still unapplied to any arguments)+  arg :: Type -> Q Exp -> Q Exp, -- ^ Convert an argument+  var :: (Q Exp -> Q Exp -> Q Exp) -> Q Exp -> Q Exp, -- ^ Convert a variable+  ap  :: Q Exp -> Q Exp -> Q Exp -- ^ Apply an argument or variable to the method+}++varExp :: Name -> Q Exp+varExp = pure . VarE++varPat :: Name -> Q Pat+varPat = pure . VarP++-- | The identity `Derivator`. Not useful on its own, but often used as input for other `Derivator`s.+idDeriv :: Derivator+idDeriv = Derivator {+  res  = id,+  op   = const id,+  arg  = const id,+  var  = const id,+  ap   = \f a -> [| $f $a |]+}++-- | Derive the instance with the given `Derivator` and the given instance head.+--+-- The instance head can be passed as a template haskell type quotation, for example:+--+-- @+-- {-\# LANGUAGE TemplateHaskell #-}+-- [t| `Num` `ShowsPrec` |]+-- [t| forall a. `Num` a => `Num` [a] |]+-- [t| forall a b. (`Num` a, `Num` b) => `Num` (a, b) |]+-- @+deriveInstance :: Derivator -> Q Type -> Q [Dec]+deriveInstance deriv qtyp = do+  typ <- qtyp+  case typ of+    ForallT _ ctx (AppT (ConT className) typeName) ->+      deriveInstance' deriv ctx className typeName+    AppT (ConT className) typeName ->+      deriveInstance' deriv [] className typeName+    _ -> fail $ "No support for type: " ++ show typ++deriveInstance' :: Derivator -> Cxt -> Name -> Type -> Q [Dec]+deriveInstance' deriv ctx className typeName = do+  ClassI (ClassD _ _ [KindedTV tvn _] _ decs) _ <- reify className+  impl <- for decs $ \case+    SigD nm tp -> do+      dec <- reify nm+      case dec of+        ClassOpI{} -> do+          (argNames, body) <- buildOperation deriv tvn tp (op deriv nm (varExp nm))+          let args = map (\argName -> if contains argName body then VarP argName else WildP) argNames+          pure $ Just $ FunD nm [Clause args (NormalB body) []]+        _ -> fail $ "No support for declaration: " ++ show dec+    _ -> pure Nothing+  pure [InstanceD Nothing ctx (AppT (ConT className) typeName) $ catMaybes impl]++buildOperation :: Derivator -> Name -> Type -> Q Exp -> Q ([Name], Exp)+buildOperation d nm (AppT (AppT ArrowT h) t) e | hasVar nm h = do+  varNm <- newName "var"+  (args, rhs) <- buildOperation d nm t (ap d e (var d (buildArgument nm h) (varExp varNm)))+  pure (varNm : args, rhs)+buildOperation d nm (AppT (AppT ArrowT h) t) e = do+  varNm <- newName "arg"+  (args, rhs) <- buildOperation d nm t (ap d e (arg d h (varExp varNm)))+  pure (varNm : args, rhs)+buildOperation d nm (ForallT _ _ t) e = buildOperation d nm t e+buildOperation d nm t e | isVar nm t = ([],) <$> res d e+                        | otherwise = ([],) <$> e++buildArgument :: Name -> Type -> Q Exp -> Q Exp -> Q Exp+buildArgument nm (AppT h _) _ var | isVar nm h = var+buildArgument nm (AppT _ h) over var = [| $over $(buildArgument nm h over var) |]+buildArgument _ _ _ var = var++isVar :: Name -> Type -> Bool+isVar nm (VarT nm') = nm == nm'+isVar nm (AppT h _) = isVar nm h+isVar _ _ = False++hasVar :: Name -> Type -> Bool+hasVar nm (VarT nm') = nm == nm'+hasVar nm (AppT f a) = isVar nm f || hasVar nm a+hasVar _ _ = False++tvName :: TyVarBndr -> Name+tvName (PlainTV nm) = nm+tvName (KindedTV nm _) = nm++contains :: Data d => Name -> d -> Bool+contains nm = gmapQl (||) False (\d -> maybe (contains nm d) (== nm) $ cast d)+++deriving instance Lift Fixity+deriving instance Lift FixityDirection++-- | Helper for showing infix expressions+data ShowsPrec = ShowsPrec (Int -> String -> String) | ShowOp2 Fixity (Int -> String -> String) | ShowOp1 Fixity (Int -> String -> String)+instance Show ShowsPrec where+  showsPrec d (ShowsPrec f) = f d+  showsPrec d (ShowOp2 (Fixity p _) f) = showParen (d > p) $ f 0+  showsPrec _ (ShowOp1 _ f) = showParen True $ f 0++showAp :: ShowsPrec -> ShowsPrec -> ShowsPrec+showAp (ShowsPrec f) (ShowsPrec g) = ShowsPrec $ \d -> showParen (d > 10) $ f 10 . showChar ' ' . g 11+showAp (ShowOp2 fx@(Fixity p i) f) (ShowsPrec g) = ShowOp1 fx $ \_ -> g (p + fromEnum (i /= InfixL)) . showChar ' ' . f 0+showAp (ShowOp1 (Fixity p i) f) (ShowsPrec g) = ShowsPrec $ \d -> showParen (d > p) (f 0 . showChar ' ' . g (p + fromEnum (i /= InfixR)))+showAp _ _ = error "Unexpected use of showAp"++-- | Derive instances for `ShowsPrec`. Example:+--+-- @+-- `deriveInstance` `showDeriv` [t| `Num` `ShowsPrec` |]+--+-- > `show` ((6 `*` 7) `^` 2 :: `ShowsPrec`)+-- "fromInteger 6 * fromInteger 7 * (fromInteger 6 * fromInteger 7)"+-- @+showDeriv :: Derivator+showDeriv = idDeriv {+  op = \nm _ -> let name = nameBase nm in if isOperator name+    then do+      fx <- fromMaybe defaultFixity <$> reifyFixity nm+      [| ShowOp2 fx $ const $ showString $(pure . LitE . StringL $ name) |]+    else+      [| ShowsPrec  $ const $ showString $(pure . LitE . StringL $ name) |],+  arg = \case+    (VarT _) -> const [| ShowsPrec $ const (showString "#Unshowable#") |]+    _ -> \v -> [| ShowsPrec $ flip showsPrec $v |],+  var = \_ v ->  [| ShowsPrec $ flip showsPrec $v |],+  ap  = \f a -> [| showAp $f $a |]+}++isOperator :: String -> Bool+isOperator (c:_) = not (isAlpha c) && c /= '_'+isOperator _ = False

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@@ -0,0 +1,1 @@+# derive-lifted-instances

@@ -0,0 +1,34 @@+name:                derive-lifted-instances+version:             0+synopsis:            Derive class instances though various kinds of lifting+description:         Helper functions to use Template Haskell for generating class instances.+homepage:            https://github.com/sjoerdvisscher/derive-lifted-instances+bug-reports:         https://github.com/sjoerdvisscher/derive-lifted-instances/issues+license:             Apache-2.0+license-file:        LICENSE+author:              Sjoerd Visscher+maintainer:          sjoerd@w3future.com+category:            Data, Generics, Development+build-type:          Simple+cabal-version:       2.0++extra-source-files:+  examples/*.hs+  README.md+  CHANGELOG.md++library+  exposed-modules:+    Data.DeriveLiftedInstances+    Data.DeriveLiftedInstances.Internal++  build-depends:+      base >= 4.13 && < 4.15+    , template-haskell >= 2.15 && < 2.17++  default-language:+    Haskell2010++source-repository head+  type:     git+  location: git://github.com/sjoerdvisscher/derive-lifted-instances.git

@@ -0,0 +1,56 @@+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE RankNTypes #-}+{-# LANGUAGE TemplateHaskell #-}+module Test where++import Data.DeriveLiftedInstances+import Data.Functor.Identity++class Test a where+  op0 :: a+  op1 :: Int -> [a] -> a+  op2 :: [[a]] -> a++instance Test Int where+  op0 = 1+  op1 i is = i + sum is+  op2 = sum . fmap sum++newtype X = X { unX :: Int } deriving Show+mkX :: Int -> X+mkX = X . (`mod` 10)+deriveInstance (isoDeriv [| mkX |] [| unX |] idDeriv) [t| Test X |]+deriveInstance (isoDeriv [| mkX |] [| unX |] idDeriv) [t| Eq X |]+deriveInstance (isoDeriv [| mkX |] [| unX |] idDeriv) [t| Ord X |]+deriveInstance (isoDeriv [| mkX |] [| unX |] idDeriv) [t| Num X |]++deriveInstance showDeriv [t| Test ShowsPrec |]+deriveInstance unitDeriv [t| Test () |]+deriveInstance (apDeriv idDeriv) [t| forall a. Test a => Test [a] |]+deriveInstance (tupleDeriv idDeriv idDeriv) [t| forall a b. (Test a, Test b) => Test (a, b) |]+-- deriveInstance (newtypeDeriv 'Identity 'runIdentity idDeriv) [t| forall a. Test a => Test (Identity a) |]++newtype Ap f a = Ap { getAp :: f a } deriving Show+deriveInstance (newtypeDeriv 'Ap 'getAp (apDeriv idDeriv)) [t| forall f a. (Applicative f, Test a) => Test (Ap f a) |]++deriveInstance (newtypeDeriv 'Identity 'runIdentity (newtypeDeriv 'Ap 'getAp (apDeriv idDeriv))) [t| forall f a. (Applicative f, Test a) => Test (Identity (Ap f a)) |]++newtype Id a = Id { runId :: a }+deriveInstance (apDeriv (apDeriv (newtypeDeriv 'Id 'runId idDeriv))) [t| forall a. Test a => Test (() -> Identity (Id a)) |]+deriveInstance (apDeriv (tupleDeriv idDeriv idDeriv)) [t| forall a b. (Test a, Test b) => Test (() -> (a, b)) |]+deriveInstance (tupleDeriv (apDeriv idDeriv) (newtypeDeriv 'Id 'runId idDeriv)) [t| forall a b. (Test a, Test b) => Test (() -> a, Id b) |]++class Test1 f where+  hop0 :: f a+  hop0' :: f Int+  hop1 :: Int -> f Int -> f Int++instance Test1 [] where+  hop0 = []+  hop0' = [1]+  hop1 i = map (+ i)++deriveInstance (newtypeDeriv 'Ap 'getAp idDeriv) [t| forall f. Test1 f => Test1 (Ap f) |]+deriveInstance (newtypeDeriv 'Ap 'getAp idDeriv) [t| forall f. Functor f => Functor (Ap f) |]+deriveInstance (newtypeDeriv 'Ap 'getAp idDeriv) [t| forall f. Applicative f => Applicative (Ap f) |]+deriveInstance (newtypeDeriv 'Ap 'getAp idDeriv) [t| forall f. Monad f => Monad (Ap f) |]