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Add generic default for Table class, and share its implementation with Rel8able
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@ -1,17 +1,10 @@
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{-# language AllowAmbiguousTypes #-}
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{-# language DataKinds #-}
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{-# language DisambiguateRecordFields #-}
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{-# language DefaultSignatures #-}
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{-# language FlexibleContexts #-}
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{-# language FlexibleInstances #-}
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{-# language GADTs #-}
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{-# language MultiParamTypeClasses #-}
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{-# language QuantifiedConstraints #-}
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{-# language ScopedTypeVariables #-}
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{-# language StandaloneKindSignatures #-}
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{-# language TypeApplications #-}
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{-# language TypeFamilies #-}
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{-# language TypeOperators #-}
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{-# language UndecidableInstances #-}
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{-# options_ghc -fno-warn-orphans #-}
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@ -24,28 +17,20 @@ where
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-- base
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import Data.Kind ( Constraint, Type )
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import GHC.Generics
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( Generic, Rep, from, to
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, (:*:)( (:*:) ), K1( K1 ), M1( M1 )
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, D, S
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, Meta( MetaSel )
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)
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import qualified GHC.Generics as G ( C )
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import GHC.TypeLits ( KnownSymbol )
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import GHC.Generics ( Generic, Rep, from, to )
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import Prelude
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import Unsafe.Coerce ( unsafeCoerce )
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-- rel8
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import Rel8.Schema.Context ( Col )
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import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler )
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import Rel8.Schema.Context.Label ( Labelable )
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import Rel8.Schema.Field ( Reify, Reifiable, hreify, hunreify )
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import Rel8.Schema.HTable ( HTable )
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import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
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import Rel8.Schema.HTable.Pair ( HPair(..) )
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import qualified Rel8.Schema.Kind as K
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import Rel8.Schema.Name ( Name )
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import Rel8.Table
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( Table, Columns, Context, fromColumns, toColumns
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, GTable, GColumns, fromGColumns, toGColumns
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)
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@ -116,72 +101,25 @@ class HTable (GRep t) => Rel8able t where
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gtoColumns :: (Labelable context, Reifiable context)
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=> t (Reify context) -> GRep t (Col (Reify context))
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default gfromColumns :: forall context.
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default gfromColumns ::
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( Generic (t (Reify context))
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, GColumns (Rep (t (Reify context))) ~ GRep t
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, GRel8able context (Rep (t (Reify context)))
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, GTable (Reify context) (Rep (t (Reify context)))
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) => GRep t (Col (Reify context)) -> t (Reify context)
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gfromColumns = to . fromGColumns @_ @(Rep (t (Reify context)))
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gfromColumns = to . fromGColumns
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default gtoColumns :: forall context.
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default gtoColumns ::
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( Generic (t (Reify context))
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, GColumns (Rep (t (Reify context))) ~ GRep t
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, GRel8able context (Rep (t (Reify context)))
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, GTable (Reify context) (Rep (t (Reify context)))
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) => t (Reify context) -> GRep t (Col (Reify context))
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gtoColumns = toGColumns @_ @(Rep (t (Reify context))) . from
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gtoColumns = toGColumns . from
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type GRep :: K.Table -> K.HTable
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type GRep t = GColumns (Rep (t (Reify Name)))
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type GColumns :: (Type -> Type) -> K.HTable
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type family GColumns rep where
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GColumns (M1 D _ rep) = GColumns rep
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GColumns (M1 G.C _ rep) = GColumns rep
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GColumns (rep1 :*: rep2) = HPair (GColumns rep1) (GColumns rep2)
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GColumns (M1 S ('MetaSel ('Just label) _ _ _) (K1 _ a)) =
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HLabel label (Columns a)
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type GRel8able :: K.Context -> (Type -> Type) -> Constraint
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class GRel8able context rep where
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fromGColumns :: GColumns rep (Col (Reify context)) -> rep x
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toGColumns :: rep x -> GColumns rep (Col (Reify context))
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instance GRel8able context rep => GRel8able context (M1 D c rep) where
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fromGColumns = M1 . fromGColumns @context @rep
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toGColumns (M1 a) = toGColumns @context @rep a
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instance GRel8able context rep => GRel8able context (M1 G.C c rep) where
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fromGColumns = M1 . fromGColumns @context @rep
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toGColumns (M1 a) = toGColumns @context @rep a
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instance (GRel8able context rep1, GRel8able context rep2) =>
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GRel8able context (rep1 :*: rep2)
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where
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fromGColumns (HPair a b) =
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fromGColumns @context @rep1 a :*: fromGColumns @context @rep2 b
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toGColumns (a :*: b) =
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HPair (toGColumns @context @rep1 a) (toGColumns @context @rep2 b)
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instance
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( Table (Reify context) a
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, Labelable context
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, KnownSymbol label
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, GColumns (M1 S meta k1) ~ HLabel label (Columns a)
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, meta ~ 'MetaSel ('Just label) _su _ss _ds
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, k1 ~ K1 i a
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) => GRel8able context (M1 S meta k1)
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where
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fromGColumns = M1 . K1 . fromColumns . hunlabel unlabeler
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toGColumns (M1 (K1 a)) = hlabel labeler (toColumns a)
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reify ::
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(-- Rel8able t
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--, forall necessity a. Coercible (Field context necessity a) (AField context necessity a) => Coercible (t context) (t (Reify context))
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@ -1,11 +1,14 @@
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{-# language DataKinds #-}
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{-# language DefaultSignatures #-}
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{-# language DisambiguateRecordFields #-}
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{-# language FlexibleContexts #-}
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{-# language FlexibleInstances #-}
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{-# language FunctionalDependencies #-}
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{-# language LambdaCase #-}
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{-# language NamedFieldPuns #-}
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{-# language ScopedTypeVariables #-}
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{-# language StandaloneKindSignatures #-}
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{-# language TypeApplications #-}
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{-# language TypeFamilies #-}
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{-# language TypeOperators #-}
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{-# language UndecidableInstances #-}
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@ -14,6 +17,7 @@ module Rel8.Table
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( Table (Columns, Context)
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, toColumns, fromColumns
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, Congruent
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, GTable, GColumns, GContext, fromGColumns, toGColumns
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)
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where
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@ -22,6 +26,13 @@ import Data.Functor ( ($>) )
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import Data.Functor.Identity ( Identity( Identity ) )
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import Data.Kind ( Constraint, Type )
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import Data.List.NonEmpty ( NonEmpty )
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import GHC.Generics
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( Generic, Rep, from, to
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, (:*:)( (:*:) ), K1( K1 ), M1( M1 )
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, C, D, S
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, Meta( MetaSel )
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)
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import GHC.TypeLits ( KnownSymbol )
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import Prelude hiding ( null )
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-- rel8
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@ -76,6 +87,79 @@ class (HTable (Columns a), context ~ Context a) => Table context a | a -> contex
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toColumns :: a -> Columns a (Col (Context a))
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fromColumns :: Columns a (Col (Context a)) -> a
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type Columns a = GColumns (Rep a)
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type Context a = GContext (Rep a)
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default toColumns ::
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( Generic a, GTable (GContext (Rep a)) (Rep a)
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, Columns a ~ GColumns (Rep a)
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, Context a ~ GContext (Rep a)
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)
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=> a -> Columns a (Col (Context a))
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toColumns = toGColumns . from
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default fromColumns ::
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( Generic a, GTable (GContext (Rep a)) (Rep a)
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, Columns a ~ GColumns (Rep a)
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, Context a ~ GContext (Rep a)
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)
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=> Columns a (Col (Context a)) -> a
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fromColumns = to . fromGColumns
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type GColumns :: (Type -> Type) -> K.HTable
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type family GColumns rep where
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GColumns (M1 D _ rep) = GColumns rep
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GColumns (M1 C _ rep) = GColumns rep
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GColumns (rep1 :*: rep2) = HPair (GColumns rep1) (GColumns rep2)
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GColumns (M1 S ('MetaSel ('Just label) _ _ _) (K1 _ a)) =
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HLabel label (Columns a)
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type GContext :: (Type -> Type) -> K.Context
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type family GContext rep where
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GContext (M1 _ _ rep) = GContext rep
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GContext (rep1 :*: _rep2) = GContext rep1
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GContext (K1 _ a) = Context a
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type GTable :: K.Context -> (Type -> Type) -> Constraint
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class context ~ GContext rep => GTable context rep | rep -> context where
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fromGColumns :: GColumns rep (Col context) -> rep x
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toGColumns :: rep x -> GColumns rep (Col context)
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instance GTable context rep => GTable context (M1 D c rep) where
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fromGColumns = M1 . fromGColumns @context @rep
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toGColumns (M1 a) = toGColumns @context @rep a
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instance GTable context rep => GTable context (M1 C c rep) where
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fromGColumns = M1 . fromGColumns @context @rep
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toGColumns (M1 a) = toGColumns @context @rep a
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instance (GTable context rep1, GTable context rep2) =>
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GTable context (rep1 :*: rep2)
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where
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fromGColumns (HPair a b) =
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fromGColumns @context @rep1 a :*: fromGColumns @context @rep2 b
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toGColumns (a :*: b) =
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HPair (toGColumns @context @rep1 a) (toGColumns @context @rep2 b)
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instance
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( Table context a
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, Labelable context
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, KnownSymbol label
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, GColumns (M1 S meta k1) ~ HLabel label (Columns a)
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, meta ~ 'MetaSel ('Just label) _su _ss _ds
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, k1 ~ K1 i a
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) => GTable context (M1 S meta k1)
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where
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fromGColumns = M1 . K1 . fromColumns . hunlabel unlabeler
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toGColumns (M1 (K1 a)) = hlabel labeler (toColumns a)
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-- | Any 'HTable' is also a 'Table'.
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instance HTable t => Table context (t (Col context)) where
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