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Mu.Schema.Lens package

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@ -4,6 +4,7 @@ packages: compendium-client/
core/schema/
core/rpc/
core/optics/
core/lens/
adapter/avro/
adapter/protobuf/
adapter/persistent/

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cradle: { stack: { component: "mu-lens:lib" } }

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name: mu-lens
version: 0.3.0.0
synopsis: Lenses for @mu-schema@ terms
description:
With @mu-schema@ you can describe schemas using type-level constructs, and derive serializers from those. This package provides convenient access using @lens@es.
license: Apache-2.0
license-file: LICENSE
author: Andre Marianiello
maintainer: alejandro.serrano@47deg.com
copyright: Copyright © 2019-2020 <http://47deg.com 47 Degrees>
category: Network
build-type: Simple
cabal-version: >=1.10
homepage: https://higherkindness.io/mu-haskell/
bug-reports: https://github.com/higherkindness/mu-haskell/issues
source-repository head
type: git
location: https://github.com/higherkindness/mu-haskell
library
exposed-modules: Mu.Schema.Lens
build-depends:
base
, containers
, lens
, generic-lens
, mu-schema
, mu-rpc
, sop-core
, text
hs-source-dirs: src
default-language: Haskell2010
ghc-options: -Wall

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{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE InstanceSigs #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE OverloadedLabels #-}
{-# LANGUAGE PartialTypeSignatures #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE QuantifiedConstraints #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TypeApplications #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
module Mu.Schema.Lens where
import Control.Lens
import Data.Kind
import Data.Map
import Data.SOP
import qualified Data.Text as T
import GHC.OverloadedLabels
import GHC.TypeLits hiding (Nat) -- we need Nats with a constructor to represent non-zero
import Mu.Schema
data Nat = Zero | Succ Nat
record :: BuildRecord sch args r => r -> Term sch ('DRecord name args)
record = TRecord . buildR
class BuildRecord (sch :: Schema Symbol Symbol) (args :: [FieldDef Symbol Symbol]) (r :: Type) where
buildR :: r -> NP (Field sch) args
instance
{-# OVERLAPPABLE #-}
(Uninterpret r ~ fieldType, UninterpretField sch r) =>
BuildRecord
sch
'[ 'FieldDef fieldName fieldType
]
r
where
buildR val = Field (toFieldValue val) :* Nil
instance
( Uninterpret v1 ~ fieldType1,
Uninterpret v2 ~ fieldType2,
UninterpretField sch v1,
UninterpretField sch v2
) =>
BuildRecord
sch
'[ 'FieldDef fieldName1 fieldType1,
'FieldDef fieldName2 fieldType2
]
(v1, v2)
where
buildR (v1, v2) = Field (toFieldValue v1) :* Field (toFieldValue v2) :* Nil
instance
( Uninterpret v1 ~ fieldType1,
Uninterpret v2 ~ fieldType2,
Uninterpret v3 ~ fieldType3,
UninterpretField sch v1,
UninterpretField sch v2,
UninterpretField sch v3
) =>
BuildRecord
sch
'[ 'FieldDef fieldName1 fieldType1,
'FieldDef fieldName2 fieldType2,
'FieldDef fieldName3 fieldType3
]
(v1, v2, v3)
where
buildR (v1, v2, v3) =
Field (toFieldValue v1)
:* Field (toFieldValue v2)
:* Field (toFieldValue v3)
:* Nil
instance
( Functor f,
HasFieldIx (IndexOf fieldName fields) fields fields' fieldType fieldType',
Interpret sch fieldType ~ fieldValue,
Interpret sch fieldType' ~ fieldValue',
Uninterpret fieldValue ~ fieldType,
Uninterpret fieldValue' ~ fieldType',
UninterpretField sch fieldValue'
) =>
IsLabel
fieldName
( (fieldValue -> f fieldValue') ->
(Term sch ('DRecord name fields) -> f (Term sch ('DRecord name fields')))
)
where
fromLabel = field @fieldName
instance
forall choiceName p f sch name choiceDefs choiceDefs' choiceType choiceType'.
( Choice p,
Applicative f,
HasChoiceIx (ChoiceIndexOf choiceName choiceDefs) choiceDefs choiceDefs' choiceType choiceType'
) =>
IsLabel
choiceName
( p choiceType (f choiceType') ->
p (Term sch ('DEnum name choiceDefs)) (f (Term sch ('DEnum name choiceDefs')))
)
where
fromLabel = choose @choiceName
choose ::
forall (choiceName :: Symbol) sch name choiceDefs choiceDefs' choiceType choiceType'.
(HasChoiceIx (ChoiceIndexOf choiceName choiceDefs) choiceDefs choiceDefs' choiceType choiceType') =>
Prism
(Term sch ('DEnum name choiceDefs))
(Term sch ('DEnum name choiceDefs'))
choiceType
choiceType'
choose = chooseIx @(ChoiceIndexOf choiceName choiceDefs)
class
HasChoiceIx
(choiceIndex :: Nat)
(choiceDefs :: [ChoiceDef Symbol])
(choiceDefs' :: [ChoiceDef Symbol])
choiceType
choiceType'
| choiceIndex choiceDefs -> choiceType,
choiceIndex choiceDefs' -> choiceType',
choiceIndex choiceDefs choiceType' -> choiceDefs',
choiceIndex choiceDefs' choiceType -> choiceDefs where
chooseIx ::
Prism
(Term sch ('DEnum name choiceDefs))
(Term sch ('DEnum name' choiceDefs'))
choiceType
choiceType'
instance
HasChoiceIx
'Zero
('ChoiceDef choiceName ': choiceDefs)
('ChoiceDef choiceName ': choiceDefs)
()
()
where
chooseIx f = dimap project (either pure (fmap inject)) (right' f)
where
inject :: () -> Term sch ('DEnum name ('ChoiceDef choiceName ': choiceDefs))
inject () = TEnum (Z (Proxy @('ChoiceDef choiceName)))
project ::
Term sch ('DEnum name ('ChoiceDef choiceName ': choiceDefs)) ->
Either (Term sch ('DEnum name' ('ChoiceDef choiceName' ': choiceDefs))) ()
project term = case term of
TEnum (Z Proxy) -> Right ()
_ -> Left (TEnum (Z Proxy))
instance
(HasChoiceIx choiceIndex choiceDefs choiceDefs' choiceType choiceType') =>
HasChoiceIx
('Succ choiceIndex)
(choiceDef ': choiceDefs)
(choiceDef ': choiceDefs')
choiceType
choiceType'
where
chooseIx f =
dimap
project
inject
(right' (chooseIx @choiceIndex @choiceDefs @choiceDefs' f))
where
project ::
Term sch ('DEnum name (choiceDef ': choiceDefs)) ->
Either () (Term sch ('DEnum name choiceDefs))
project (TEnum (Z Proxy)) = Left ()
project (TEnum (S inner)) = Right (TEnum inner)
inject ::
Applicative f =>
Either () (f (Term sch ('DEnum name choiceDefs'))) ->
f (Term sch ('DEnum name (choiceDef ': choiceDefs')))
inject (Left ()) = pure (TEnum (Z Proxy))
inject (Right inner) = fmap wrap inner
wrap :: Term sch ('DEnum name choiceDefs') -> Term sch ('DEnum name (choiceDef ': choiceDefs'))
wrap (TEnum choices) = TEnum (S choices)
field ::
forall fieldName sch name fieldDefs fieldDefs' fieldType fieldType' fieldValue fieldValue'.
(HasFieldIx (IndexOf fieldName fieldDefs) fieldDefs fieldDefs' fieldType fieldType') =>
( HasFieldIx (IndexOf fieldName fieldDefs) fieldDefs fieldDefs' fieldType fieldType',
Interpret sch fieldType ~ fieldValue,
Interpret sch fieldType' ~ fieldValue',
Uninterpret fieldValue ~ fieldType,
Uninterpret fieldValue' ~ fieldType',
UninterpretField sch fieldValue'
) =>
Lens
(Term sch ('DRecord name fieldDefs))
(Term sch ('DRecord name fieldDefs'))
fieldValue
fieldValue'
field = fieldValueName @fieldName . interpretIso
fieldValueName ::
forall fieldName sch name fieldDefs fieldDefs' fieldType fieldType'.
(HasFieldIx (IndexOf fieldName fieldDefs) fieldDefs fieldDefs' fieldType fieldType') =>
Lens
(Term sch ('DRecord name fieldDefs))
(Term sch ('DRecord name fieldDefs'))
(FieldValue sch fieldType)
(FieldValue sch fieldType')
fieldValueName = fieldValueIx @(IndexOf fieldName fieldDefs)
type family IndexOf (fieldName :: fieldNameKind) (fieldDefs :: [FieldDefB builtin fieldNameKind typeNameKind]) :: Nat where
IndexOf fieldName ('FieldDef fieldName _ ': _) = 'Zero
IndexOf fieldName (_ ': fieldDefs) = 'Succ (IndexOf fieldName fieldDefs)
IndexOf fieldName '[] = TypeError ('Text "does not contain field name " ':<>: 'ShowType fieldName)
type family
ChoiceIndexOf
(choiceName :: choiceNameKind)
(choiceDefs :: [ChoiceDef choiceNameKind]) ::
Nat where
ChoiceIndexOf choiceName ('ChoiceDef choiceName : _) = 'Zero
ChoiceIndexOf choiceName (_ ': choiceDefs) = 'Succ (ChoiceIndexOf choiceName choiceDefs)
class
HasFieldIx
(fieldIndex :: Nat)
(fieldDefs :: [FieldDef Symbol Symbol])
(fieldDefs' :: [FieldDef Symbol Symbol])
(fieldType :: FieldType Symbol)
(fieldType' :: FieldType Symbol)
| fieldIndex fieldDefs -> fieldType,
fieldIndex fieldDefs' -> fieldType',
fieldIndex fieldDefs fieldType' -> fieldDefs',
fieldIndex fieldDefs' fieldType -> fieldDefs where
fieldValueIx ::
Lens
(Term sch ('DRecord name fieldDefs))
(Term sch ('DRecord name' fieldDefs'))
(FieldValue sch fieldType)
(FieldValue sch fieldType')
instance
HasFieldIx
'Zero
('FieldDef fieldName fieldType ': fieldDefs)
('FieldDef fieldName fieldType' ': fieldDefs)
fieldType
fieldType'
where
fieldValueIx f (TRecord (Field fieldValue :* fields)) = TRecord . (:* fields) . Field <$> f fieldValue
instance
( HasFieldIx
fieldIndex
fieldDefs
fieldDefs'
fieldType
fieldType'
) =>
HasFieldIx ('Succ fieldIndex) (fieldDef ': fieldDefs) (fieldDef ': fieldDefs') fieldType fieldType'
where
fieldValueIx f (TRecord (firstField :* restOfFields)) =
wrap <$> fieldValueIx @fieldIndex f (TRecord restOfFields)
where
wrap (TRecord fields) = TRecord (firstField :* fields)
interpretIso ::
( Uninterpret (Interpret sch fieldType') ~ fieldType',
UninterpretField sch (Interpret sch fieldType')
) =>
Iso (FieldValue sch fieldType) (FieldValue sch fieldType') (Interpret sch fieldType) (Interpret sch fieldType')
interpretIso = dimap fromFieldValue (fmap toFieldValue)
type family Interpret (sch :: Schema typeName fieldName) (fieldType :: FieldType typeName) :: Type where
Interpret _ 'TNull = ()
Interpret _ ('TPrimitive builtin) = builtin
Interpret sch ('TSchematic typeName) = Term sch (sch :/: typeName)
Interpret sch ('TOption innerType) = Maybe (Interpret sch innerType)
Interpret sch ('TList innerType) = [Interpret sch innerType]
Interpret sch ('TMap keyType valueType) = Map (Interpret sch keyType) (Interpret sch valueType)
Interpret sch ('TUnion choiceTypes) = NS Identity (InterpretList sch choiceTypes)
type family InterpretList sch (fieldTypes :: [FieldType typeName]) :: [Type] where
InterpretList _ '[] = '[]
InterpretList sch (t ': ts) = (Interpret sch t ': InterpretList sch ts)
fromFieldValue :: FieldValue sch fieldType -> Interpret sch fieldType
fromFieldValue = \case
FNull -> ()
(FPrimitive val) -> val
(FSchematic term) -> term
(FOption maybeFieldValue) -> fromFieldValue <$> maybeFieldValue
(FList listFieldValues) -> fromFieldValue <$> listFieldValues
(FMap mapFieldValues) -> mapKeysMonotonic fromFieldValue (fromFieldValue <$> mapFieldValues)
(FUnion (Z val)) -> Z (Identity (fromFieldValue val))
(FUnion (S val)) -> S (fromFieldValue (FUnion val))
class UninterpretField sch a where
type Uninterpret a :: FieldType typeName
toFieldValue :: a -> FieldValue sch (Uninterpret a)
instance UninterpretField sch () where
type Uninterpret () = 'TNull
toFieldValue () = FNull
instance UninterpretField sch Int where
type Uninterpret Int = 'TPrimitive Int
toFieldValue = FPrimitive
instance UninterpretField sch T.Text where
type Uninterpret T.Text = 'TPrimitive T.Text
toFieldValue = FPrimitive
instance
((sch :/: recordName) ~ 'DRecord recordName fieldDefs) =>
UninterpretField sch (Term sch ('DRecord recordName fieldDefs))
where
type Uninterpret (Term sch ('DRecord recordName fieldDefs)) = 'TSchematic recordName
toFieldValue = FSchematic
instance (UninterpretField sch a) => UninterpretField sch (Maybe a) where
type Uninterpret (Maybe a) = 'TOption (Uninterpret a)
toFieldValue = FOption . fmap toFieldValue
instance (UninterpretField sch a) => UninterpretField sch [a] where
type Uninterpret [a] = 'TList (Uninterpret a)
toFieldValue = FList . fmap toFieldValue
instance
(Ord (FieldValue sch (Uninterpret k)), UninterpretField sch k, UninterpretField sch v) =>
UninterpretField sch (Map k v)
where
type Uninterpret (Map k v) = 'TMap (Uninterpret k) (Uninterpret v)
toFieldValue = FMap . mapKeysMonotonic toFieldValue . fmap toFieldValue
instance
(All (UninterpretField sch) choiceTypes) =>
UninterpretField sch (NS Identity (choiceTypes :: [Type]))
where
type Uninterpret (NS Identity choiceTypes) = 'TUnion (UninterpretList choiceTypes)
toFieldValue = FUnion . nsToFieldValues
nsToFieldValues :: (All (UninterpretField sch) choiceTypes) => NS Identity choiceTypes -> NS (FieldValue sch) (UninterpretList choiceTypes)
nsToFieldValues = \case
(Z val) -> Z . toFieldValue . runIdentity $ val
(S val) -> S (nsToFieldValues val)
type family Tail (l :: [k]) where
Tail (t ': ts) = ts
type family UninterpretList (as :: [Type]) :: [FieldType typeName] where
UninterpretList '[] = '[]
UninterpretList (t ': ts) = Uninterpret t ': UninterpretList ts

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@ -5,6 +5,7 @@ packages:
- core/schema
- core/rpc
- core/optics
- core/lens
- adapter/avro
- adapter/protobuf
- adapter/persistent