{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE DefaultSignatures #-}
module Database.Record.FromSql (
RecordFromSql, runTakeRecord, runToRecord,
createRecordFromSql,
(<&>),
maybeRecord,
FromSql (recordFromSql),
takeRecord, toRecord,
valueRecordFromSql,
) where
import GHC.Generics (Generic, Rep, U1 (..), K1 (..), M1 (..), (:*:)(..), to)
import Control.Applicative ((<$>), Applicative (pure, (<*>)))
import Control.Monad (liftM, ap)
import Database.Record.Persistable (PersistableType)
import qualified Database.Record.Persistable as Persistable
import Database.Record.KeyConstraint
(HasColumnConstraint(columnConstraint), ColumnConstraint, NotNull, index)
newtype RecordFromSql q a = RecordFromSql ([q] -> (a, [q]))
runTakeRecord :: RecordFromSql q a
-> [q]
-> (a, [q])
runTakeRecord :: forall q a. RecordFromSql q a -> [q] -> (a, [q])
runTakeRecord (RecordFromSql [q] -> (a, [q])
f) = [q] -> (a, [q])
f
createRecordFromSql :: ([q] -> (a, [q]))
-> RecordFromSql q a
createRecordFromSql :: forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
createRecordFromSql = forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
RecordFromSql
runToRecord :: RecordFromSql q a
-> [q]
-> a
runToRecord :: forall q a. RecordFromSql q a -> [q] -> a
runToRecord RecordFromSql q a
r = forall a b. (a, b) -> a
fst forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall q a. RecordFromSql q a -> [q] -> (a, [q])
runTakeRecord RecordFromSql q a
r
instance Monad (RecordFromSql q) where
return :: forall a. a -> RecordFromSql q a
return a
a = forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
createRecordFromSql ((,) a
a)
RecordFromSql q a
ma >>= :: forall a b.
RecordFromSql q a -> (a -> RecordFromSql q b) -> RecordFromSql q b
>>= a -> RecordFromSql q b
fmb =
forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
createRecordFromSql
(\[q]
vals -> let (a
a, [q]
vals') = forall q a. RecordFromSql q a -> [q] -> (a, [q])
runTakeRecord RecordFromSql q a
ma [q]
vals
in forall q a. RecordFromSql q a -> [q] -> (a, [q])
runTakeRecord (a -> RecordFromSql q b
fmb a
a) [q]
vals')
instance Functor (RecordFromSql q) where
fmap :: forall a b. (a -> b) -> RecordFromSql q a -> RecordFromSql q b
fmap = forall (m :: * -> *) a1 r. Monad m => (a1 -> r) -> m a1 -> m r
liftM
instance Applicative (RecordFromSql q) where
pure :: forall a. a -> RecordFromSql q a
pure = forall (m :: * -> *) a. Monad m => a -> m a
return
<*> :: forall a b.
RecordFromSql q (a -> b) -> RecordFromSql q a -> RecordFromSql q b
(<*>) = forall (m :: * -> *) a b. Monad m => m (a -> b) -> m a -> m b
ap
(<&>) :: RecordFromSql q a -> RecordFromSql q b -> RecordFromSql q (a, b)
RecordFromSql q a
a <&> :: forall q a b.
RecordFromSql q a -> RecordFromSql q b -> RecordFromSql q (a, b)
<&> RecordFromSql q b
b = (,) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> RecordFromSql q a
a forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> RecordFromSql q b
b
infixl 4 <&>
maybeRecord :: PersistableType q
=> RecordFromSql q a
-> ColumnConstraint NotNull a
-> RecordFromSql q (Maybe a)
maybeRecord :: forall q a.
PersistableType q =>
RecordFromSql q a
-> ColumnConstraint NotNull a -> RecordFromSql q (Maybe a)
maybeRecord RecordFromSql q a
rec ColumnConstraint NotNull a
pkey = forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
createRecordFromSql [q] -> (Maybe a, [q])
mayToRec where
mayToRec :: [q] -> (Maybe a, [q])
mayToRec [q]
vals
| [q]
vals forall a. [a] -> Int -> a
!! forall c r. ColumnConstraint c r -> Int
index ColumnConstraint NotNull a
pkey forall a. Eq a => a -> a -> Bool
/= forall q. PersistableType q => q
Persistable.sqlNullValue = (forall a. a -> Maybe a
Just a
a, [q]
vals')
| Bool
otherwise = (forall a. Maybe a
Nothing, [q]
vals') where
(a
a, [q]
vals') = forall q a. RecordFromSql q a -> [q] -> (a, [q])
runTakeRecord RecordFromSql q a
rec [q]
vals
class FromSql q a where
recordFromSql :: RecordFromSql q a
default recordFromSql :: (Generic a, GFromSql q (Rep a)) => RecordFromSql q a
recordFromSql = forall a x. Generic a => Rep a x -> a
to forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall q (f :: * -> *) a. GFromSql q f => RecordFromSql q (f a)
gFromSql
class GFromSql q f where
gFromSql :: RecordFromSql q (f a)
instance GFromSql q U1 where
gFromSql :: forall a. RecordFromSql q (U1 a)
gFromSql = forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
createRecordFromSql forall a b. (a -> b) -> a -> b
$ (,) forall k (p :: k). U1 p
U1
instance (GFromSql q a, GFromSql q b) => GFromSql q (a :*: b) where
gFromSql :: forall a. RecordFromSql q ((:*:) a b a)
gFromSql = forall k (f :: k -> *) (g :: k -> *) (p :: k).
f p -> g p -> (:*:) f g p
(:*:) forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall q (f :: * -> *) a. GFromSql q f => RecordFromSql q (f a)
gFromSql forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> forall q (f :: * -> *) a. GFromSql q f => RecordFromSql q (f a)
gFromSql
instance GFromSql q a => GFromSql q (M1 i c a) where
gFromSql :: forall a. RecordFromSql q (M1 i c a a)
gFromSql = forall k i (c :: Meta) (f :: k -> *) (p :: k). f p -> M1 i c f p
M1 forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall q (f :: * -> *) a. GFromSql q f => RecordFromSql q (f a)
gFromSql
instance FromSql q a => GFromSql q (K1 i a) where
gFromSql :: forall a. RecordFromSql q (K1 i a a)
gFromSql = forall k i c (p :: k). c -> K1 i c p
K1 forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall q a. FromSql q a => RecordFromSql q a
recordFromSql
instance (HasColumnConstraint NotNull a, FromSql q a, PersistableType q)
=> FromSql q (Maybe a) where
recordFromSql :: RecordFromSql q (Maybe a)
recordFromSql = forall q a.
PersistableType q =>
RecordFromSql q a
-> ColumnConstraint NotNull a -> RecordFromSql q (Maybe a)
maybeRecord forall q a. FromSql q a => RecordFromSql q a
recordFromSql forall c a. HasColumnConstraint c a => ColumnConstraint c a
columnConstraint
instance FromSql q ()
takeRecord :: FromSql q a => [q] -> (a, [q])
takeRecord :: forall q a. FromSql q a => [q] -> (a, [q])
takeRecord = forall q a. RecordFromSql q a -> [q] -> (a, [q])
runTakeRecord forall q a. FromSql q a => RecordFromSql q a
recordFromSql
toRecord :: FromSql q a => [q] -> a
toRecord :: forall q a. FromSql q a => [q] -> a
toRecord = forall q a. RecordFromSql q a -> [q] -> a
runToRecord forall q a. FromSql q a => RecordFromSql q a
recordFromSql
valueRecordFromSql :: (q -> a) -> RecordFromSql q a
valueRecordFromSql :: forall q a. (q -> a) -> RecordFromSql q a
valueRecordFromSql q -> a
d = forall q a. ([q] -> (a, [q])) -> RecordFromSql q a
createRecordFromSql forall a b. (a -> b) -> a -> b
$ \[q]
qs -> (q -> a
d forall a b. (a -> b) -> a -> b
$ forall a. [a] -> a
head [q]
qs, forall a. [a] -> [a]
tail [q]
qs)