{-# OPTIONS_HADDOCK not-home #-}

{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE Arrows #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE UndecidableInstances #-}

module Opaleye.Internal.MaybeFields where

import           Control.Arrow (returnA, (<<<), (>>>))

import qualified Opaleye.Internal.Binary as B
import qualified Opaleye.Internal.Column as IC
import qualified Opaleye.ToFields as Constant
import qualified Opaleye.Internal.HaskellDB.PrimQuery as HPQ
import           Opaleye.Internal.Inferrable (Inferrable(Inferrable),
                                              runInferrable)
import qualified Opaleye.Internal.QueryArr as IQ
import qualified Opaleye.Internal.Rebind as Rebind
import qualified Opaleye.Internal.RunQuery as RQ
import qualified Opaleye.Internal.Unpackspec as U
import qualified Opaleye.Internal.Values as V
import           Opaleye.Select (Select, SelectArr)
import qualified Opaleye.Column
import qualified Opaleye.Field
import           Opaleye.Field (Field)
import           Opaleye.Internal.Operators ((.&&), (.||), (.==), restrict, not,
                                             ifExplict, IfPP, EqPP(EqPP))
import qualified Opaleye.Internal.Lateral
import qualified Opaleye.SqlTypes
import           Opaleye.SqlTypes (SqlBool, IsSqlType)

import           Control.Monad (replicateM_)

import qualified Data.Profunctor as P
import qualified Data.Profunctor.Product as PP
import qualified Data.Profunctor.Product.Default as PP

import qualified Database.PostgreSQL.Simple.FromRow as PGSR

-- | The Opaleye analogue of 'Data.Maybe.Maybe'.  A value of type
-- @MaybeFields a@ either contains a value of type @a@, or it contains
-- nothing.
data MaybeFields fields =
  MaybeFields {
    forall fields. MaybeFields fields -> Column SqlBool
mfPresent :: Opaleye.Column.Column Opaleye.SqlTypes.SqlBool
  , forall fields. MaybeFields fields -> fields
mfFields  :: fields
  }
  deriving (forall a b. (a -> b) -> MaybeFields a -> MaybeFields b)
-> (forall a b. a -> MaybeFields b -> MaybeFields a)
-> Functor MaybeFields
forall a b. a -> MaybeFields b -> MaybeFields a
forall a b. (a -> b) -> MaybeFields a -> MaybeFields b
forall (f :: * -> *).
(forall a b. (a -> b) -> f a -> f b)
-> (forall a b. a -> f b -> f a) -> Functor f
$cfmap :: forall a b. (a -> b) -> MaybeFields a -> MaybeFields b
fmap :: forall a b. (a -> b) -> MaybeFields a -> MaybeFields b
$c<$ :: forall a b. a -> MaybeFields b -> MaybeFields a
<$ :: forall a b. a -> MaybeFields b -> MaybeFields a
Functor

instance Applicative MaybeFields where
  pure :: forall a. a -> MaybeFields a
pure a
fields = MaybeFields { mfPresent :: Column SqlBool
mfPresent = Bool -> Field SqlBool
Opaleye.SqlTypes.sqlBool Bool
True
                            , mfFields :: a
mfFields  = a
fields
                            }
  MaybeFields Column SqlBool
t a -> b
f <*> :: forall a b. MaybeFields (a -> b) -> MaybeFields a -> MaybeFields b
<*> MaybeFields Column SqlBool
t' a
a =
    MaybeFields {
      mfPresent :: Column SqlBool
mfPresent = Column SqlBool
Field SqlBool
t Field SqlBool -> Field SqlBool -> Field SqlBool
.&& Column SqlBool
Field SqlBool
t'
    , mfFields :: b
mfFields  = a -> b
f a
a
    }

instance Monad MaybeFields where
  return :: forall a. a -> MaybeFields a
return = a -> MaybeFields a
forall a. a -> MaybeFields a
forall (f :: * -> *) a. Applicative f => a -> f a
pure
  MaybeFields Column SqlBool
t a
a >>= :: forall a b. MaybeFields a -> (a -> MaybeFields b) -> MaybeFields b
>>= a -> MaybeFields b
f = case a -> MaybeFields b
f a
a of
    MaybeFields Column SqlBool
t' b
b -> Column SqlBool -> b -> MaybeFields b
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields (Column SqlBool
Field SqlBool
t Field SqlBool -> Field SqlBool -> Field SqlBool
.&& Column SqlBool
Field SqlBool
t') b
b

-- | The Opaleye analogue of 'Data.Maybe.Nothing'.
nothingFields :: PP.Default V.Nullspec a a => MaybeFields a
nothingFields :: forall a. Default Nullspec a a => MaybeFields a
nothingFields = Nullspec a a -> MaybeFields a
forall a b. Nullspec a b -> MaybeFields b
nothingFieldsExplicit Nullspec a a
forall a. Default Nullspec a a => Nullspec a a
def
  where def :: PP.Default V.Nullspec a a => V.Nullspec a a
        def :: forall a. Default Nullspec a a => Nullspec a a
def = Nullspec a a
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

-- | The Opaleye analogue of @'Prelude.const' 'Data.Maybe.Nothing'@.
-- Can be useful to avoid type inference problems, because it doesn't
-- pick up a type class constraint.
nothingFieldsOfTypeOf :: a -> MaybeFields a
nothingFieldsOfTypeOf :: forall a. a -> MaybeFields a
nothingFieldsOfTypeOf a
a = MaybeFields {
    mfPresent :: Column SqlBool
mfPresent = Bool -> Field SqlBool
Opaleye.SqlTypes.sqlBool Bool
False
  , mfFields :: a
mfFields  = a
a
  }

-- | The Opaleye analogue of 'Data.Maybe.Just'.  Equivalent to
-- 'Control.Applicative.pure'.
justFields :: a -> MaybeFields a
justFields :: forall a. a -> MaybeFields a
justFields = a -> MaybeFields a
forall a. a -> MaybeFields a
forall (f :: * -> *) a. Applicative f => a -> f a
pure

-- | The Opaleye analogue of 'Data.Maybe.maybe'
maybeFields :: PP.Default IfPP b b => b -> (a -> b) -> MaybeFields a -> b
maybeFields :: forall b a. Default IfPP b b => b -> (a -> b) -> MaybeFields a -> b
maybeFields = IfPP b b -> b -> (a -> b) -> MaybeFields a -> b
forall b b' a. IfPP b b' -> b -> (a -> b) -> MaybeFields a -> b'
maybeFieldsExplicit IfPP b b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

-- | Use a Haskell @\\case@ expression to pattern match on a
-- 'MaybeFields'.
--
-- @
-- example :: MaybeFields (Field SqlInt4) -> Field SqlInt4
-- example mf = matchMaybe mf $ \\case
--   Nothing -> 0
--   Just x  -> x * 100
-- @
matchMaybe :: PP.Default IfPP b b => MaybeFields a -> (Maybe a -> b) -> b
matchMaybe :: forall b a.
Default IfPP b b =>
MaybeFields a -> (Maybe a -> b) -> b
matchMaybe MaybeFields a
mf Maybe a -> b
f = b -> (a -> b) -> MaybeFields a -> b
forall b a. Default IfPP b b => b -> (a -> b) -> MaybeFields a -> b
maybeFields (Maybe a -> b
f Maybe a
forall a. Maybe a
Nothing) (Maybe a -> b
f (Maybe a -> b) -> (a -> Maybe a) -> a -> b
forall b c a. (b -> c) -> (a -> b) -> a -> c
. a -> Maybe a
forall a. a -> Maybe a
Just) MaybeFields a
mf

-- | The Opaleye analogue of 'Data.Maybe.fromMaybe'
fromMaybeFields :: PP.Default IfPP b b => b -> MaybeFields b -> b
fromMaybeFields :: forall b. Default IfPP b b => b -> MaybeFields b -> b
fromMaybeFields = IfPP b b -> b -> MaybeFields b -> b
forall b. IfPP b b -> b -> MaybeFields b -> b
fromMaybeFieldsExplicit IfPP b b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

-- | The Opaleye analogue of 'Data.Maybe.maybeToList'. Unless you are
-- using arrow notation you'll probably find 'catMaybeFields' easier
-- to use.
maybeFieldsToSelect :: SelectArr (MaybeFields a) a
maybeFieldsToSelect :: forall a. SelectArr (MaybeFields a) a
maybeFieldsToSelect = proc MaybeFields a
mf -> do
  SelectArr (Field SqlBool) ()
restrict -< MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
mf
  SelectArr a a
forall (a :: * -> * -> *) b. Arrow a => a b b
returnA -< MaybeFields a -> a
forall fields. MaybeFields fields -> fields
mfFields MaybeFields a
mf

-- | The Opaleye analogue of 'Data.Maybe.catMaybes'.  Most commonly
-- you will want to use this at type
--
-- @
-- catMaybeFields :: Select (MaybeFields a) -> Select a
-- @
catMaybeFields :: SelectArr i (MaybeFields a) -> SelectArr i a
catMaybeFields :: forall i a. SelectArr i (MaybeFields a) -> SelectArr i a
catMaybeFields = (SelectArr i (MaybeFields a)
-> SelectArr (MaybeFields a) a -> SelectArr i a
forall {k} (cat :: k -> k -> *) (a :: k) (b :: k) (c :: k).
Category cat =>
cat a b -> cat b c -> cat a c
>>> SelectArr (MaybeFields a) a
forall a. SelectArr (MaybeFields a) a
maybeFieldsToSelect)

maybeFieldsExplicit :: IfPP b b' -> b -> (a -> b) -> MaybeFields a -> b'
maybeFieldsExplicit :: forall b b' a. IfPP b b' -> b -> (a -> b) -> MaybeFields a -> b'
maybeFieldsExplicit IfPP b b'
ifpp b
b a -> b
f MaybeFields a
mf =
  IfPP b b' -> Field SqlBool -> b -> b -> b'
forall columns columns'.
IfPP columns columns'
-> Field SqlBool -> columns -> columns -> columns'
ifExplict IfPP b b'
ifpp (MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
mf) (a -> b
f (MaybeFields a -> a
forall fields. MaybeFields fields -> fields
mfFields MaybeFields a
mf)) b
b

fromMaybeFieldsExplicit :: IfPP b b -> b -> MaybeFields b -> b
fromMaybeFieldsExplicit :: forall b. IfPP b b -> b -> MaybeFields b -> b
fromMaybeFieldsExplicit IfPP b b
ifpp = (b -> (b -> b) -> MaybeFields b -> b)
-> (b -> b) -> b -> MaybeFields b -> b
forall a b c. (a -> b -> c) -> b -> a -> c
flip (IfPP b b -> b -> (b -> b) -> MaybeFields b -> b
forall b b' a. IfPP b b' -> b -> (a -> b) -> MaybeFields a -> b'
maybeFieldsExplicit IfPP b b
ifpp) b -> b
forall a. a -> a
id

nothingFieldsExplicit :: V.Nullspec a b -> MaybeFields b
nothingFieldsExplicit :: forall a b. Nullspec a b -> MaybeFields b
nothingFieldsExplicit = b -> MaybeFields b
forall a. a -> MaybeFields a
nothingFieldsOfTypeOf (b -> MaybeFields b)
-> (Nullspec a b -> b) -> Nullspec a b -> MaybeFields b
forall b c a. (b -> c) -> (a -> b) -> a -> c
. Nullspec a b -> b
forall a fields. Nullspec a fields -> fields
V.nullFields

traverseMaybeFields :: SelectArr a b -> SelectArr (MaybeFields a) (MaybeFields b)
traverseMaybeFields :: forall a b.
SelectArr a b -> SelectArr (MaybeFields a) (MaybeFields b)
traverseMaybeFields SelectArr a b
query = proc MaybeFields a
mfInput -> do
  MaybeFields b
mfOutput <- SelectArr (MaybeFields a) b
-> SelectArr (MaybeFields a) (MaybeFields b)
forall i a. SelectArr i a -> SelectArr i (MaybeFields a)
optional (SelectArr a b
query SelectArr a b
-> SelectArr (MaybeFields a) a -> SelectArr (MaybeFields a) b
forall {k} (cat :: k -> k -> *) (b :: k) (c :: k) (a :: k).
Category cat =>
cat b c -> cat a b -> cat a c
<<< SelectArr (MaybeFields a) a
forall a. SelectArr (MaybeFields a) a
maybeFieldsToSelect) -< MaybeFields a
mfInput
  SelectArr (Field SqlBool) ()
restrict -< MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
mfInput Field SqlBool -> Field SqlBool -> Field SqlBool
`implies` MaybeFields b -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields b
mfOutput
  SelectArr (MaybeFields b) (MaybeFields b)
forall (a :: * -> * -> *) b. Arrow a => a b b
returnA -< Column SqlBool -> b -> MaybeFields b
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields (MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
mfInput) (MaybeFields b -> b
forall fields. MaybeFields fields -> fields
mfFields MaybeFields b
mfOutput)

  where Field SqlBool
a implies :: Field SqlBool -> Field SqlBool -> Field SqlBool
`implies` Field SqlBool
b = Field SqlBool -> Field SqlBool
Opaleye.Internal.Operators.not Field SqlBool
a Field SqlBool -> Field SqlBool -> Field SqlBool
.|| Field SqlBool
b

isJustAnd ::
  MaybeFields a ->
  (a -> Opaleye.Field.Field SqlBool) ->
  Opaleye.Field.Field SqlBool
isJustAnd :: forall a. MaybeFields a -> (a -> Field SqlBool) -> Field SqlBool
isJustAnd MaybeFields a
ma a -> Field SqlBool
cond = MaybeFields a -> (Maybe a -> Field SqlBool) -> Field SqlBool
forall b a.
Default IfPP b b =>
MaybeFields a -> (Maybe a -> b) -> b
matchMaybe MaybeFields a
ma ((Maybe a -> Field SqlBool) -> Field SqlBool)
-> (Maybe a -> Field SqlBool) -> Field SqlBool
forall a b. (a -> b) -> a -> b
$ \case
  Maybe a
Nothing -> Bool -> Field SqlBool
Opaleye.SqlTypes.sqlBool Bool
False
  Just a
a -> a -> Field SqlBool
cond a
a

optional :: SelectArr i a -> SelectArr i (MaybeFields a)
optional :: forall i a. SelectArr i a -> SelectArr i (MaybeFields a)
optional = (Select a -> Select (MaybeFields a))
-> SelectArr i a -> SelectArr i (MaybeFields a)
forall a b i.
(Select a -> Select b) -> SelectArr i a -> SelectArr i b
Opaleye.Internal.Lateral.laterally ((FieldNullable SqlBool -> a -> MaybeFields a)
-> Select a -> Select (MaybeFields a)
forall a r.
(FieldNullable SqlBool -> a -> r) -> Select a -> Select r
optionalInternal (Column SqlBool -> a -> MaybeFields a
Field SqlBool -> a -> MaybeFields a
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields (Field SqlBool -> a -> MaybeFields a)
-> (FieldNullable SqlBool -> Field SqlBool)
-> FieldNullable SqlBool
-> a
-> MaybeFields a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. FieldNullable SqlBool -> Field SqlBool
forall {a}. FieldNullable a -> Field SqlBool
isNotNull))
  where isNotNull :: FieldNullable a -> Field SqlBool
isNotNull = Field SqlBool -> Field SqlBool
Opaleye.Internal.Operators.not (Field SqlBool -> Field SqlBool)
-> (FieldNullable a -> Field SqlBool)
-> FieldNullable a
-> Field SqlBool
forall b c a. (b -> c) -> (a -> b) -> a -> c
. FieldNullable a -> Field SqlBool
forall {a}. FieldNullable a -> Field SqlBool
Opaleye.Field.isNull

optionalInternal :: (Opaleye.Field.FieldNullable SqlBool -> a -> r) -> Select a -> Select r
optionalInternal :: forall a r.
(FieldNullable SqlBool -> a -> r) -> Select a -> Select r
optionalInternal FieldNullable SqlBool -> a -> r
f Select a
query = State Tag (() -> (r, PrimExpr, PrimQuery)) -> QueryArr () r
forall a b.
State Tag (a -> (b, PrimExpr, PrimQuery)) -> QueryArr a b
IQ.leftJoinQueryArr' (State Tag (() -> (r, PrimExpr, PrimQuery)) -> QueryArr () r)
-> State Tag (() -> (r, PrimExpr, PrimQuery)) -> QueryArr () r
forall a b. (a -> b) -> a -> b
$ do
    -- This is basically a left join on TRUE, but Shane (@duairc)
    -- wrote it to ensure that we don't need an Unpackspec a a.
    let true :: PrimExpr
true = Literal -> PrimExpr
HPQ.ConstExpr (Bool -> Literal
HPQ.BoolLit Bool
True)
    (r
r, PrimQuery
right) <- QueryArr () r -> State Tag (r, PrimQuery)
forall a. Select a -> State Tag (a, PrimQuery)
IQ.runSimpleSelect (QueryArr () r -> State Tag (r, PrimQuery))
-> QueryArr () r -> State Tag (r, PrimQuery)
forall a b. (a -> b) -> a -> b
$ proc () -> do
          a
a <- Select a
query -< ()
          FieldNullable SqlBool
true_ <- SelectArr (FieldNullable SqlBool) (FieldNullable SqlBool)
forall a. Default Unpackspec a a => SelectArr a a
Rebind.rebind -< Field SqlBool -> FieldNullable SqlBool
forall a. Field a -> FieldNullable a
Opaleye.Field.toNullable (PrimExpr -> Field SqlBool
forall (n :: Nullability) sqlType. PrimExpr -> Field_ n sqlType
IC.Column PrimExpr
true)
          SelectArr r r
forall (a :: * -> * -> *) b. Arrow a => a b b
returnA -< FieldNullable SqlBool -> a -> r
f FieldNullable SqlBool
true_ a
a
    (() -> (r, PrimExpr, PrimQuery))
-> State Tag (() -> (r, PrimExpr, PrimQuery))
forall a. a -> StateT Tag Identity a
forall (f :: * -> *) a. Applicative f => a -> f a
pure ((() -> (r, PrimExpr, PrimQuery))
 -> State Tag (() -> (r, PrimExpr, PrimQuery)))
-> (() -> (r, PrimExpr, PrimQuery))
-> State Tag (() -> (r, PrimExpr, PrimQuery))
forall a b. (a -> b) -> a -> b
$ \() -> (r
r, PrimExpr
true, PrimQuery
right)


-- | An example to demonstrate how the functionality of (lateral)
-- @LEFT JOIN@ can be recovered using 'optional'.
lateralLeftJoinOptional :: SelectArr i a
                        -> SelectArr i b
                        -> ((a, b) -> Opaleye.Field.Field Opaleye.SqlTypes.SqlBool)
                        -> SelectArr i (a, MaybeFields b)
lateralLeftJoinOptional :: forall i a b.
SelectArr i a
-> SelectArr i b
-> ((a, b) -> Field SqlBool)
-> SelectArr i (a, MaybeFields b)
lateralLeftJoinOptional SelectArr i a
fieldsL SelectArr i b
fieldsR (a, b) -> Field SqlBool
cond = proc i
i -> do
  a
fieldsL' <- SelectArr i a
fieldsL -< i
i
  MaybeFields b
maybeFieldsR' <- SelectArr (a, i) b -> SelectArr (a, i) (MaybeFields b)
forall i a. SelectArr i a -> SelectArr i (MaybeFields a)
optional (proc (a
fieldsL', i
i) -> do
                                b
fieldsR' <- SelectArr i b
fieldsR -< i
i
                                SelectArr (Field SqlBool) ()
restrict -< (a, b) -> Field SqlBool
cond (a
fieldsL', b
fieldsR')
                                SelectArr b b
forall (a :: * -> * -> *) b. Arrow a => a b b
returnA -< b
fieldsR'
                                ) -< (a
fieldsL', i
i)
  SelectArr (a, MaybeFields b) (a, MaybeFields b)
forall (a :: * -> * -> *) b. Arrow a => a b b
returnA -< (a
fieldsL', MaybeFields b
maybeFieldsR')

-- | An example to demonstrate how the functionality of
-- 'Opaleye.Join.optionalRestrict' can be recovered using 'optional'.
optionalRestrictOptional :: Select a
                         -> SelectArr (a -> Field SqlBool) (MaybeFields a)
optionalRestrictOptional :: forall a.
Select a -> SelectArr (a -> Field SqlBool) (MaybeFields a)
optionalRestrictOptional Select a
q = SelectArr (a -> Field SqlBool) a
-> SelectArr (a -> Field SqlBool) (MaybeFields a)
forall i a. SelectArr i a -> SelectArr i (MaybeFields a)
optional (SelectArr (a -> Field SqlBool) a
 -> SelectArr (a -> Field SqlBool) (MaybeFields a))
-> SelectArr (a -> Field SqlBool) a
-> SelectArr (a -> Field SqlBool) (MaybeFields a)
forall a b. (a -> b) -> a -> b
$ proc a -> Field SqlBool
cond -> do
  a
a <- Select a
q -< ()
  SelectArr (Field SqlBool) ()
restrict -< a -> Field SqlBool
cond a
a
  SelectArr a a
forall (a :: * -> * -> *) b. Arrow a => a b b
returnA -< a
a

-- | Convert @NULL@ to 'nothingFields' and non-@NULL@ to a 'justFields'
nullableToMaybeFields :: Opaleye.Field.FieldNullable a -> MaybeFields (Field a)
nullableToMaybeFields :: forall a. FieldNullable a -> MaybeFields (Field a)
nullableToMaybeFields FieldNullable a
x = MaybeFields
  { mfPresent :: Column SqlBool
mfPresent = Field SqlBool -> Field SqlBool
Opaleye.Internal.Operators.not (FieldNullable a -> Field SqlBool
forall {a}. FieldNullable a -> Field SqlBool
Opaleye.Field.isNull FieldNullable a
x)
  , mfFields :: Field a
mfFields = FieldNullable a -> Field a
forall a. FieldNullable a -> Field a
unsafeFromNonNull FieldNullable a
x
  }
  where unsafeFromNonNull :: Opaleye.Field.FieldNullable a -> Field a
        unsafeFromNonNull :: forall a. FieldNullable a -> Field a
unsafeFromNonNull = Field_ 'Nullable a -> Field_ 'NonNullable a
forall (n :: Nullability) a (n' :: Nullability) b.
Field_ n a -> Field_ n' b
Opaleye.Field.unsafeCoerceField

-- | Convert 'nothingFields' to @NULL@ to a 'justFields' to non-@NULL@
maybeFieldsToNullable :: MaybeFields (Field a) -> Opaleye.Field.FieldNullable a
maybeFieldsToNullable :: forall a. MaybeFields (Field a) -> FieldNullable a
maybeFieldsToNullable MaybeFields (Field a)
x =
  Field SqlBool
-> Field_ 'Nullable a -> Field_ 'Nullable a -> Field_ 'Nullable a
forall (n' :: Nullability) pgBool (n :: Nullability) a.
Field_ n' pgBool -> Field_ n a -> Field_ n a -> Field_ n a
IC.unsafeIfThenElse (MaybeFields (Field a) -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields (Field a)
x)
                      (Field a -> Field_ 'Nullable a
forall a. Field a -> FieldNullable a
Opaleye.Field.toNullable (MaybeFields (Field a) -> Field a
forall fields. MaybeFields fields -> fields
mfFields MaybeFields (Field a)
x))
                      Field_ 'Nullable a
forall a. FieldNullable a
Opaleye.Field.null

fromFieldsMaybeFields :: RQ.FromFields fields haskells
                      -> RQ.FromFields (MaybeFields fields) (Maybe haskells)
fromFieldsMaybeFields :: forall fields haskells.
FromFields fields haskells
-> FromFields (MaybeFields fields) (Maybe haskells)
fromFieldsMaybeFields (RQ.FromFields Unpackspec fields ()
u fields -> RowParser haskells
p fields -> Int
c) = Unpackspec (MaybeFields fields) ()
-> (MaybeFields fields -> RowParser (Maybe haskells))
-> (MaybeFields fields -> Int)
-> FromFields (MaybeFields fields) (Maybe haskells)
forall fields haskells.
Unpackspec fields ()
-> (fields -> RowParser haskells)
-> (fields -> Int)
-> FromFields fields haskells
RQ.FromFields Unpackspec (MaybeFields fields) ()
u' MaybeFields fields -> RowParser (Maybe haskells)
p' MaybeFields fields -> Int
c'
  where u' :: Unpackspec (MaybeFields fields) ()
u' = () ()
-> Unpackspec (MaybeFields fields) (MaybeFields ())
-> Unpackspec (MaybeFields fields) ()
forall a b.
a
-> Unpackspec (MaybeFields fields) b
-> Unpackspec (MaybeFields fields) a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ Unpackspec (Field SqlBool) (Field SqlBool)
-> Unpackspec fields ()
-> Unpackspec (MaybeFields fields) (MaybeFields ())
forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> p a b -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields Unpackspec (Field SqlBool) (Field SqlBool)
forall (n :: Nullability) a. Unpackspec (Field_ n a) (Field_ n a)
U.unpackspecField Unpackspec fields ()
u

        p' :: MaybeFields fields -> RowParser (Maybe haskells)
p' = \MaybeFields fields
mf -> do
          Bool
hIsPresent <- RowParser Bool
forall a. FromField a => RowParser a
PGSR.field

          case Bool
hIsPresent of
            Bool
True  -> haskells -> Maybe haskells
forall a. a -> Maybe a
Just (haskells -> Maybe haskells)
-> RowParser haskells -> RowParser (Maybe haskells)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> fields -> RowParser haskells
p (MaybeFields fields -> fields
forall fields. MaybeFields fields -> fields
mfFields MaybeFields fields
mf)
            Bool
False -> Maybe haskells
forall a. Maybe a
Nothing Maybe haskells -> RowParser () -> RowParser (Maybe haskells)
forall a b. a -> RowParser b -> RowParser a
forall (f :: * -> *) a b. Functor f => a -> f b -> f a
<$ Int -> RowParser () -> RowParser ()
forall (m :: * -> *) a. Applicative m => Int -> m a -> m ()
replicateM_ (fields -> Int
c (MaybeFields fields -> fields
forall fields. MaybeFields fields -> fields
mfFields MaybeFields fields
mf))
                                            (FieldParser () -> RowParser ()
forall a. FieldParser a -> RowParser a
PGSR.fieldWith (\Field
_ Maybe ByteString
_ -> () -> Conversion ()
forall a. a -> Conversion a
forall (f :: * -> *) a. Applicative f => a -> f a
pure ()))

        c' :: MaybeFields fields -> Int
c' = \MaybeFields fields
mf -> fields -> Int
c (MaybeFields fields -> fields
forall fields. MaybeFields fields -> fields
mfFields MaybeFields fields
mf) Int -> Int -> Int
forall a. Num a => a -> a -> a
+ Int
1

-- | This is not safe in general because it relies on p not doing
-- anything observable with the @a@s if @mfPresent@ is false.  In
-- particular, it won't work for
-- 'Opaleye.Internal.Distinct.Distinctspec' because it does indeed
-- look at the @mfFields@ to check distinctness.
productProfunctorMaybeFields :: PP.ProductProfunctor p
                             => p (Field SqlBool) (Field SqlBool)
                             -> p a b
                             -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields :: forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> p a b -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields p (Field SqlBool) (Field SqlBool)
b p a b
p = Column SqlBool -> b -> MaybeFields b
Field SqlBool -> b -> MaybeFields b
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields (Field SqlBool -> b -> MaybeFields b)
-> p (MaybeFields a) (Field SqlBool)
-> p (MaybeFields a) (b -> MaybeFields b)
forall (p :: * -> * -> *) b c a.
Profunctor p =>
(b -> c) -> p a b -> p a c
PP.***$ (MaybeFields a -> Field SqlBool)
-> p (Field SqlBool) (Field SqlBool)
-> p (MaybeFields a) (Field SqlBool)
forall a b c. (a -> b) -> p b c -> p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap MaybeFields a -> Column SqlBool
MaybeFields a -> Field SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent p (Field SqlBool) (Field SqlBool)
b
                                               p (MaybeFields a) (b -> MaybeFields b)
-> p (MaybeFields a) b -> p (MaybeFields a) (MaybeFields b)
forall a b c. p a (b -> c) -> p a b -> p a c
forall (p :: * -> * -> *) a b c.
ProductProfunctor p =>
p a (b -> c) -> p a b -> p a c
PP.**** (MaybeFields a -> a) -> p a b -> p (MaybeFields a) b
forall a b c. (a -> b) -> p b c -> p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap MaybeFields a -> a
forall fields. MaybeFields fields -> fields
mfFields p a b
p

nullspecMaybeFields :: V.Nullspec a b
                    -> V.Nullspec (MaybeFields a) (MaybeFields b)
nullspecMaybeFields :: forall a b.
Nullspec a b -> Nullspec (MaybeFields a) (MaybeFields b)
nullspecMaybeFields = Nullspec (Field SqlBool) (Field SqlBool)
-> Nullspec a b -> Nullspec (MaybeFields a) (MaybeFields b)
forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> p a b -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields Nullspec (Field SqlBool) (Field SqlBool)
forall a (n :: Nullability) sqlType.
IsSqlType sqlType =>
Nullspec a (Field_ n sqlType)
V.nullspecField

unpackspecMaybeFields :: U.Unpackspec a b
                      -> U.Unpackspec (MaybeFields a) (MaybeFields b)
unpackspecMaybeFields :: forall a b.
Unpackspec a b -> Unpackspec (MaybeFields a) (MaybeFields b)
unpackspecMaybeFields = Unpackspec (Field SqlBool) (Field SqlBool)
-> Unpackspec a b -> Unpackspec (MaybeFields a) (MaybeFields b)
forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> p a b -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields Unpackspec (Field SqlBool) (Field SqlBool)
forall (n :: Nullability) a. Unpackspec (Field_ n a) (Field_ n a)
U.unpackspecField

valuesspecMaybeFields :: V.Valuesspec a b
                      -> V.Valuesspec (MaybeFields a) (MaybeFields b)
valuesspecMaybeFields :: forall a b.
Valuesspec a b -> Valuesspec (MaybeFields a) (MaybeFields b)
valuesspecMaybeFields = Valuesspec (Field SqlBool) (Field SqlBool)
-> Valuesspec a b -> Valuesspec (MaybeFields a) (MaybeFields b)
forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> p a b -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields Valuesspec (Field SqlBool) (Field SqlBool)
forall a (n :: Nullability).
IsSqlType a =>
Valuesspec (Field_ n a) (Field_ n a)
V.valuesspecField

toFieldsMaybeFields :: V.Nullspec a b
                    -> Constant.ToFields a b
                    -> Constant.ToFields (Maybe a) (MaybeFields b)
toFieldsMaybeFields :: forall a b.
Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)
toFieldsMaybeFields Nullspec a b
n ToFields a b
p = (Maybe a -> MaybeFields b) -> ToFields (Maybe a) (MaybeFields b)
forall haskells fields.
(haskells -> fields) -> ToFields haskells fields
Constant.toToFields ((Maybe a -> MaybeFields b) -> ToFields (Maybe a) (MaybeFields b))
-> (Maybe a -> MaybeFields b) -> ToFields (Maybe a) (MaybeFields b)
forall a b. (a -> b) -> a -> b
$ \case
  Maybe a
Nothing -> Nullspec a b -> MaybeFields b
forall a b. Nullspec a b -> MaybeFields b
nothingFieldsExplicit Nullspec a b
n
  Just a
a  -> b -> MaybeFields b
forall a. a -> MaybeFields a
justFields (ToFields a b -> a -> b
forall haskells fields.
ToFields haskells fields -> haskells -> fields
Constant.toFieldsExplicit ToFields a b
p a
a)

ifPPMaybeFields :: IfPP a b -> IfPP (MaybeFields a) (MaybeFields b)
ifPPMaybeFields :: forall a b. IfPP a b -> IfPP (MaybeFields a) (MaybeFields b)
ifPPMaybeFields = IfPP (Field SqlBool) (Field SqlBool)
-> IfPP a b -> IfPP (MaybeFields a) (MaybeFields b)
forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> p a b -> p (MaybeFields a) (MaybeFields b)
productProfunctorMaybeFields IfPP (Field SqlBool) (Field SqlBool)
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

-- I'd rather not crack open EqPP to implement this but the
-- alternative is adding an operation eqPPOr :: EqPP a b -> EqPP a' b
-- -> EqPP (a, a') b, and possibly even more than that, so I can't be
-- bothered right now.
eqPPMaybeFields :: EqPP a b -> EqPP (MaybeFields a) (MaybeFields b)
eqPPMaybeFields :: forall a b. EqPP a b -> EqPP (MaybeFields a) (MaybeFields b)
eqPPMaybeFields (EqPP a -> a -> Field SqlBool
eqFields) = (MaybeFields a -> MaybeFields a -> Field SqlBool)
-> EqPP (MaybeFields a) (MaybeFields b)
forall a b. (a -> a -> Field SqlBool) -> EqPP a b
EqPP (\MaybeFields a
m1 MaybeFields a
m2 ->
    (MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
m1 Field SqlBool -> Field SqlBool -> Field SqlBool
forall columns.
Default EqPP columns columns =>
columns -> columns -> Field SqlBool
.== MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
m2)
    Field SqlBool -> Field SqlBool -> Field SqlBool
.&& (MaybeFields a -> Column SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent MaybeFields a
m1 Field SqlBool -> Field SqlBool -> Field SqlBool
`implies` a -> a -> Field SqlBool
eqFields (MaybeFields a -> a
forall fields. MaybeFields fields -> fields
mfFields MaybeFields a
m1) (MaybeFields a -> a
forall fields. MaybeFields fields -> fields
mfFields MaybeFields a
m2)))
  where Field SqlBool
a implies :: Field SqlBool -> Field SqlBool -> Field SqlBool
`implies` Field SqlBool
b = Field SqlBool -> Field SqlBool
Opaleye.Internal.Operators.not Field SqlBool
a Field SqlBool -> Field SqlBool -> Field SqlBool
.|| Field SqlBool
b

-- | This is only safe if d is OK with having nulls passed through it
-- when they claim to be non-null.
unWithNulls :: PP.ProductProfunctor p
            => p (Field SqlBool) (Field SqlBool)
            -> WithNulls p a b
            -> p (MaybeFields a) (MaybeFields b)
unWithNulls :: forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> WithNulls p a b -> p (MaybeFields a) (MaybeFields b)
unWithNulls p (Field SqlBool) (Field SqlBool)
b (WithNulls p (MaybeFields a) b
d) =
    Column SqlBool -> b -> MaybeFields b
Field SqlBool -> b -> MaybeFields b
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields (Field SqlBool -> b -> MaybeFields b)
-> p (MaybeFields a) (Field SqlBool)
-> p (MaybeFields a) (b -> MaybeFields b)
forall (p :: * -> * -> *) b c a.
Profunctor p =>
(b -> c) -> p a b -> p a c
PP.***$ (MaybeFields a -> Field SqlBool)
-> p (Field SqlBool) (Field SqlBool)
-> p (MaybeFields a) (Field SqlBool)
forall a b c. (a -> b) -> p b c -> p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap MaybeFields a -> Column SqlBool
MaybeFields a -> Field SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent p (Field SqlBool) (Field SqlBool)
b
                p (MaybeFields a) (b -> MaybeFields b)
-> p (MaybeFields a) b -> p (MaybeFields a) (MaybeFields b)
forall a b c. p a (b -> c) -> p a b -> p a c
forall (p :: * -> * -> *) a b c.
ProductProfunctor p =>
p a (b -> c) -> p a b -> p a c
PP.**** p (MaybeFields a) b
d

newtype WithNulls p a b =
  WithNulls (p (MaybeFields a) b)

-- | This is only safe if @b@ is OK with having nulls passed through it
-- when they claim to be non-null.
mapMaybeFieldsWithNulls :: PP.ProductProfunctor p
                        => p (Field SqlBool) (Field SqlBool)
                        -> WithNulls p a b
                        -> WithNulls p (MaybeFields a) (MaybeFields b)
mapMaybeFieldsWithNulls :: forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> WithNulls p a b -> WithNulls p (MaybeFields a) (MaybeFields b)
mapMaybeFieldsWithNulls p (Field SqlBool) (Field SqlBool)
b WithNulls p a b
d =
  Column SqlBool -> b -> MaybeFields b
Field SqlBool -> b -> MaybeFields b
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields (Field SqlBool -> b -> MaybeFields b)
-> WithNulls p (MaybeFields a) (Field SqlBool)
-> WithNulls p (MaybeFields a) (b -> MaybeFields b)
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> (MaybeFields a -> Field SqlBool)
-> WithNulls p (Field SqlBool) (Field SqlBool)
-> WithNulls p (MaybeFields a) (Field SqlBool)
forall a b c. (a -> b) -> WithNulls p b c -> WithNulls p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap MaybeFields a -> Column SqlBool
MaybeFields a -> Field SqlBool
forall fields. MaybeFields fields -> Column SqlBool
mfPresent (p (Field SqlBool) (Field SqlBool)
-> WithNulls p (Field SqlBool) (Field SqlBool)
forall a (p :: * -> * -> *) (n :: Nullability).
(IsSqlType a, Profunctor p) =>
p (Field_ n a) (Field_ n a)
-> WithNulls p (Field_ n a) (Field_ n a)
withNullsField p (Field SqlBool) (Field SqlBool)
b)
              WithNulls p (MaybeFields a) (b -> MaybeFields b)
-> WithNulls p (MaybeFields a) b
-> WithNulls p (MaybeFields a) (MaybeFields b)
forall a b.
WithNulls p (MaybeFields a) (a -> b)
-> WithNulls p (MaybeFields a) a -> WithNulls p (MaybeFields a) b
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> (MaybeFields a -> a)
-> WithNulls p a b -> WithNulls p (MaybeFields a) b
forall a b c. (a -> b) -> WithNulls p b c -> WithNulls p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap MaybeFields a -> a
forall fields. MaybeFields fields -> fields
mfFields WithNulls p a b
d

-- | This is only safe if @col@ is OK with having nulls passed through it
-- when they claim to be non-null.
withNullsField :: (IsSqlType a, P.Profunctor p)
               => p (IC.Field_ n a) (IC.Field_ n a)
               -> WithNulls p (IC.Field_ n a) (IC.Field_ n a)
withNullsField :: forall a (p :: * -> * -> *) (n :: Nullability).
(IsSqlType a, Profunctor p) =>
p (Field_ n a) (Field_ n a)
-> WithNulls p (Field_ n a) (Field_ n a)
withNullsField p (Field_ n a) (Field_ n a)
col = WithNulls p (Field_ n a) (Field_ n a)
result
  where result :: WithNulls p (Field_ n a) (Field_ n a)
result = p (MaybeFields (Field_ n a)) (Field_ n a)
-> WithNulls p (Field_ n a) (Field_ n a)
forall (p :: * -> * -> *) a b.
p (MaybeFields a) b -> WithNulls p a b
WithNulls ((MaybeFields (Field_ n a) -> Field_ n a)
-> p (Field_ n a) (Field_ n a)
-> p (MaybeFields (Field_ n a)) (Field_ n a)
forall a b c. (a -> b) -> p b c -> p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap (\(MaybeFields Column SqlBool
b Field_ n a
c) ->
                                      IfPP (Field_ n a) (Field_ n a)
-> Field SqlBool -> Field_ n a -> Field_ n a -> Field_ n a
forall columns columns'.
IfPP columns columns'
-> Field SqlBool -> columns -> columns -> columns'
ifExplict IfPP (Field_ n a) (Field_ n a)
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def Column SqlBool
Field SqlBool
b Field_ n a
c Field_ n a
forall {n :: Nullability}. Field_ n a
nullC) p (Field_ n a) (Field_ n a)
col)
        nullC :: Field_ n a
nullC = Nullspec Any (Field_ n a) -> Field_ n a
forall a fields. Nullspec a fields -> fields
V.nullFields Nullspec Any (Field_ n a)
forall a (n :: Nullability) sqlType.
IsSqlType sqlType =>
Nullspec a (Field_ n sqlType)
V.nullspecField

binaryspecMaybeFields
  :: WithNulls B.Binaryspec a b
  -> B.Binaryspec (MaybeFields a) (MaybeFields b)
binaryspecMaybeFields :: forall a b.
WithNulls Binaryspec a b
-> Binaryspec (MaybeFields a) (MaybeFields b)
binaryspecMaybeFields = Binaryspec (Field SqlBool) (Field SqlBool)
-> WithNulls Binaryspec a b
-> Binaryspec (MaybeFields a) (MaybeFields b)
forall (p :: * -> * -> *) a b.
ProductProfunctor p =>
p (Field SqlBool) (Field SqlBool)
-> WithNulls p a b -> p (MaybeFields a) (MaybeFields b)
unWithNulls Binaryspec (Field SqlBool) (Field SqlBool)
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance P.Profunctor p => P.Profunctor (WithNulls p) where
  dimap :: forall a b c d.
(a -> b) -> (c -> d) -> WithNulls p b c -> WithNulls p a d
dimap a -> b
f c -> d
g (WithNulls p (MaybeFields b) c
d) = p (MaybeFields a) d -> WithNulls p a d
forall (p :: * -> * -> *) a b.
p (MaybeFields a) b -> WithNulls p a b
WithNulls ((MaybeFields a -> MaybeFields b)
-> (c -> d) -> p (MaybeFields b) c -> p (MaybeFields a) d
forall a b c d. (a -> b) -> (c -> d) -> p b c -> p a d
forall (p :: * -> * -> *) a b c d.
Profunctor p =>
(a -> b) -> (c -> d) -> p b c -> p a d
P.dimap ((a -> b) -> MaybeFields a -> MaybeFields b
forall a b. (a -> b) -> MaybeFields a -> MaybeFields b
forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap a -> b
f) c -> d
g p (MaybeFields b) c
d)

instance P.Profunctor p => Functor (WithNulls p a) where
  fmap :: forall a b. (a -> b) -> WithNulls p a a -> WithNulls p a b
fmap = (a -> b) -> WithNulls p a a -> WithNulls p a b
forall b c a. (b -> c) -> WithNulls p a b -> WithNulls p a c
forall (p :: * -> * -> *) b c a.
Profunctor p =>
(b -> c) -> p a b -> p a c
P.rmap

instance PP.ProductProfunctor p => Applicative (WithNulls p a) where
  pure :: forall a. a -> WithNulls p a a
pure = p (MaybeFields a) a -> WithNulls p a a
forall (p :: * -> * -> *) a b.
p (MaybeFields a) b -> WithNulls p a b
WithNulls (p (MaybeFields a) a -> WithNulls p a a)
-> (a -> p (MaybeFields a) a) -> a -> WithNulls p a a
forall b c a. (b -> c) -> (a -> b) -> a -> c
. a -> p (MaybeFields a) a
forall b a. b -> p a b
forall (p :: * -> * -> *) b a. ProductProfunctor p => b -> p a b
PP.purePP
  WithNulls p (MaybeFields a) (a -> b)
fd <*> :: forall a b.
WithNulls p a (a -> b) -> WithNulls p a a -> WithNulls p a b
<*> WithNulls p (MaybeFields a) a
xd = p (MaybeFields a) b -> WithNulls p a b
forall (p :: * -> * -> *) a b.
p (MaybeFields a) b -> WithNulls p a b
WithNulls (p (MaybeFields a) (a -> b)
fd p (MaybeFields a) (a -> b)
-> p (MaybeFields a) a -> p (MaybeFields a) b
forall a b c. p a (b -> c) -> p a b -> p a c
forall (p :: * -> * -> *) a b c.
ProductProfunctor p =>
p a (b -> c) -> p a b -> p a c
PP.**** p (MaybeFields a) a
xd)

instance PP.ProductProfunctor p => PP.ProductProfunctor (WithNulls p) where
  purePP :: forall b a. b -> WithNulls p a b
purePP = b -> WithNulls p a b
forall a. a -> WithNulls p a a
forall (f :: * -> *) a. Applicative f => a -> f a
pure
  **** :: forall a b c.
WithNulls p a (b -> c) -> WithNulls p a b -> WithNulls p a c
(****) = WithNulls p a (b -> c) -> WithNulls p a b -> WithNulls p a c
forall a b.
WithNulls p a (a -> b) -> WithNulls p a a -> WithNulls p a b
forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
(<*>)

instance PP.SumProfunctor p => PP.SumProfunctor (WithNulls p) where
  WithNulls p (MaybeFields a) b
ff +++! :: forall a b a' b'.
WithNulls p a b
-> WithNulls p a' b' -> WithNulls p (Either a a') (Either b b')
+++! WithNulls p (MaybeFields a') b'
xf =
    p (MaybeFields (Either a a')) (Either b b')
-> WithNulls p (Either a a') (Either b b')
forall (p :: * -> * -> *) a b.
p (MaybeFields a) b -> WithNulls p a b
WithNulls (((MaybeFields (Either a a')
  -> Either (MaybeFields a) (MaybeFields a'))
 -> p (Either (MaybeFields a) (MaybeFields a')) (Either b b')
 -> p (MaybeFields (Either a a')) (Either b b'))
-> p (Either (MaybeFields a) (MaybeFields a')) (Either b b')
-> (MaybeFields (Either a a')
    -> Either (MaybeFields a) (MaybeFields a'))
-> p (MaybeFields (Either a a')) (Either b b')
forall a b c. (a -> b -> c) -> b -> a -> c
flip (MaybeFields (Either a a')
 -> Either (MaybeFields a) (MaybeFields a'))
-> p (Either (MaybeFields a) (MaybeFields a')) (Either b b')
-> p (MaybeFields (Either a a')) (Either b b')
forall a b c. (a -> b) -> p b c -> p a c
forall (p :: * -> * -> *) a b c.
Profunctor p =>
(a -> b) -> p b c -> p a c
P.lmap (p (MaybeFields a) b
ff p (MaybeFields a) b
-> p (MaybeFields a') b'
-> p (Either (MaybeFields a) (MaybeFields a')) (Either b b')
forall a b a' b'. p a b -> p a' b' -> p (Either a a') (Either b b')
forall (p :: * -> * -> *) a b a' b'.
SumProfunctor p =>
p a b -> p a' b' -> p (Either a a') (Either b b')
PP.+++! p (MaybeFields a') b'
xf) ((MaybeFields (Either a a')
  -> Either (MaybeFields a) (MaybeFields a'))
 -> p (MaybeFields (Either a a')) (Either b b'))
-> (MaybeFields (Either a a')
    -> Either (MaybeFields a) (MaybeFields a'))
-> p (MaybeFields (Either a a')) (Either b b')
forall a b. (a -> b) -> a -> b
$ \case
                  MaybeFields Column SqlBool
b (Left a
l)  -> MaybeFields a -> Either (MaybeFields a) (MaybeFields a')
forall a b. a -> Either a b
Left  (Column SqlBool -> a -> MaybeFields a
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields Column SqlBool
b a
l)
                  MaybeFields Column SqlBool
b (Right a'
r) -> MaybeFields a' -> Either (MaybeFields a) (MaybeFields a')
forall a b. b -> Either a b
Right (Column SqlBool -> a' -> MaybeFields a'
forall fields. Column SqlBool -> fields -> MaybeFields fields
MaybeFields Column SqlBool
b a'
r))

instance PP.Default RQ.FromFields fields haskells
  => PP.Default RQ.FromFields (MaybeFields fields) (Maybe haskells) where
  def :: FromFields (MaybeFields fields) (Maybe haskells)
def = FromFields fields haskells
-> FromFields (MaybeFields fields) (Maybe haskells)
forall fields haskells.
FromFields fields haskells
-> FromFields (MaybeFields fields) (Maybe haskells)
fromFieldsMaybeFields FromFields fields haskells
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance PP.Default U.Unpackspec a b
  => PP.Default U.Unpackspec (MaybeFields a) (MaybeFields b) where
  def :: Unpackspec (MaybeFields a) (MaybeFields b)
def = Unpackspec a b -> Unpackspec (MaybeFields a) (MaybeFields b)
forall a b.
Unpackspec a b -> Unpackspec (MaybeFields a) (MaybeFields b)
unpackspecMaybeFields Unpackspec a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance PP.Default V.Valuesspec a b
  => PP.Default V.Valuesspec (MaybeFields a) (MaybeFields b) where
  def :: Valuesspec (MaybeFields a) (MaybeFields b)
def = Valuesspec a b -> Valuesspec (MaybeFields a) (MaybeFields b)
forall a b.
Valuesspec a b -> Valuesspec (MaybeFields a) (MaybeFields b)
valuesspecMaybeFields Valuesspec a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance (PP.Default Constant.ToFields a b, PP.Default V.Nullspec a b)
  => PP.Default Constant.ToFields (Maybe a) (MaybeFields b) where
  def :: ToFields (Maybe a) (MaybeFields b)
def = Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)
forall a b.
Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)
toFieldsMaybeFields Nullspec a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def ToFields a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance PP.Default IfPP a b
  => PP.Default IfPP (MaybeFields a) (MaybeFields b) where
  def :: IfPP (MaybeFields a) (MaybeFields b)
def = IfPP a b -> IfPP (MaybeFields a) (MaybeFields b)
forall a b. IfPP a b -> IfPP (MaybeFields a) (MaybeFields b)
ifPPMaybeFields IfPP a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance PP.Default EqPP a b
  => PP.Default EqPP (MaybeFields a) (MaybeFields b) where
  def :: EqPP (MaybeFields a) (MaybeFields b)
def = EqPP a b -> EqPP (MaybeFields a) (MaybeFields b)
forall a b. EqPP a b -> EqPP (MaybeFields a) (MaybeFields b)
eqPPMaybeFields EqPP a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance (P.Profunctor p, IsSqlType a, PP.Default p (IC.Field_ n a) (IC.Field_ n a))
  => PP.Default (WithNulls p) (IC.Field_ n a) (IC.Field_ n a) where
  def :: WithNulls p (Field_ n a) (Field_ n a)
def = p (Field_ n a) (Field_ n a)
-> WithNulls p (Field_ n a) (Field_ n a)
forall a (p :: * -> * -> *) (n :: Nullability).
(IsSqlType a, Profunctor p) =>
p (Field_ n a) (Field_ n a)
-> WithNulls p (Field_ n a) (Field_ n a)
withNullsField p (Field_ n a) (Field_ n a)
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance PP.Default (WithNulls B.Binaryspec) a b
  => PP.Default B.Binaryspec (MaybeFields a) (MaybeFields b) where
  def :: Binaryspec (MaybeFields a) (MaybeFields b)
def = WithNulls Binaryspec a b
-> Binaryspec (MaybeFields a) (MaybeFields b)
forall a b.
WithNulls Binaryspec a b
-> Binaryspec (MaybeFields a) (MaybeFields b)
binaryspecMaybeFields WithNulls Binaryspec a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def

instance (PP.Default (Inferrable RQ.FromFields) fields haskells,
          Maybe haskells ~ maybe_haskells)
  => PP.Default (Inferrable RQ.FromFields) (MaybeFields fields) maybe_haskells where
  def :: Inferrable FromFields (MaybeFields fields) maybe_haskells
def = FromFields (MaybeFields fields) maybe_haskells
-> Inferrable FromFields (MaybeFields fields) maybe_haskells
forall (p :: * -> * -> *) a b. p a b -> Inferrable p a b
Inferrable (FromFields fields haskells
-> FromFields (MaybeFields fields) (Maybe haskells)
forall fields haskells.
FromFields fields haskells
-> FromFields (MaybeFields fields) (Maybe haskells)
fromFieldsMaybeFields (Inferrable FromFields fields haskells -> FromFields fields haskells
forall (p :: * -> * -> *) a b. Inferrable p a b -> p a b
runInferrable Inferrable FromFields fields haskells
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def))

instance (PP.Default (Inferrable Constant.ToFields) a b, PP.Default V.Nullspec a b,
          MaybeFields b ~ maybeFields_b)
  => PP.Default (Inferrable Constant.ToFields) (Maybe a) maybeFields_b where
  def :: Inferrable ToFields (Maybe a) maybeFields_b
def = ToFields (Maybe a) maybeFields_b
-> Inferrable ToFields (Maybe a) maybeFields_b
forall (p :: * -> * -> *) a b. p a b -> Inferrable p a b
Inferrable (Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)
forall a b.
Nullspec a b -> ToFields a b -> ToFields (Maybe a) (MaybeFields b)
toFieldsMaybeFields Nullspec a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def (Inferrable ToFields a b -> ToFields a b
forall (p :: * -> * -> *) a b. Inferrable p a b -> p a b
runInferrable Inferrable ToFields a b
forall (p :: * -> * -> *) a b. Default p a b => p a b
PP.def))