/
GDecodeJson.purs
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GDecodeJson.purs
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module Data.Argonaut.Decode.Struct.GDecodeJson
( class GDecodeJson
, decodeJson
, decodeJson'
, gDecodeJson
) where
import Prelude (class Category, class Semigroupoid, bind, identity, ($), (<<<))
import Data.Argonaut.Core (Json)
import Data.Argonaut.Decode.Class (class DecodeJson, decodeJson) as D
import Data.Argonaut.Decode.Struct.Utils
( getMissingFieldErrorMessage
, reportJson
)
import Data.Either (Either)
import Data.Functor (class Functor, map)
import Data.Maybe (Maybe(Just, Nothing))
import Data.Operator.Bottom (class Bottom2, bottom2)
import Data.Operator.Top (class Top1_, top1_)
import Data.Struct (class RInsert, rinsert)
import Data.Symbol (class IsSymbol, SProxy(SProxy), reflectSymbol)
import Foreign.Object (Object, lookup)
import Record.Builder (Builder, build)
import Type.Data.RowList (RLProxy(RLProxy))
import Type.Proxying (class RLProxying)
import Type.Row
( class Cons
, class Lacks
, class RowToList
, Cons
, Nil
, kind RowList
)
class GDecodeJson
(p :: Type -> Type -> Type)
(f :: Type -> Type)
(g :: # Type -> Type)
(l0 :: RowList)
(l1 :: RowList)
(r1 :: # Type)
(l2 :: RowList)
(r2 :: # Type)
| l1 -> r1
, l2 -> r2
, l1 l2 -> l0
where
gDecodeJson
:: forall h
. RLProxying h l1
=> RLProxying h l2
=> h l1
-> h l2
-> Object Json
-> f (p (g r1) (g r2))
instance gDecodeJson_NilNilNil
:: ( Category p
, Top1_ f
)
=> GDecodeJson p f g Nil Nil () Nil ()
where
gDecodeJson _ _ _ = top1_ identity
instance gDecodeJson_ConsNilCons
:: ( Cons s v r' r
, D.DecodeJson v
, GDecodeJson p (Either String) g l' Nil () l' r'
, IsSymbol s
, Lacks s r'
, RInsert p g SProxy s l' r' l r
, Semigroupoid p
)
=> GDecodeJson p (Either String) g (Cons s v l') Nil () (Cons s v l') r
where
gDecodeJson _ _ object = do
case lookup fieldName object of
Just jsonVal -> do
val <- D.decodeJson jsonVal
doRest <- gDecodeJson nil l' object
top1_ $ rinsert l' l s val <<< doRest
Nothing ->
bottom2 $ getMissingFieldErrorMessage fieldName
where
fieldName :: String
fieldName = reflectSymbol s
l' = RLProxy :: RLProxy l'
l = RLProxy :: RLProxy l
nil = RLProxy :: RLProxy Nil
s = SProxy :: SProxy s
instance gDecodeJson_NilConsCons
:: ( Category p
, Top1_ f
)
=> GDecodeJson p f g Nil (Cons s v l') r (Cons s v l') r
where
gDecodeJson _ _ _ = top1_ identity
else instance gDecodeJson_ConsConsCons
:: ( Cons s v r2' r2
, D.DecodeJson v
, GDecodeJson p (Either String) g l0' (Cons s1 v1 l1') r1 l2' r2'
, IsSymbol s
, Lacks s r1
, Lacks s r2'
, RInsert p g SProxy s l2' r2' l2 r2
, Semigroupoid p
)
=> GDecodeJson
p
(Either String)
g
(Cons s v l0')
(Cons s1 v1 l1')
r1
(Cons s v l2')
r2
where
gDecodeJson _ _ object = do
case lookup fieldName object of
Just jsonVal -> do
val <- D.decodeJson jsonVal
doRest <- gDecodeJson l1 l2' object
top1_ $ rinsert l2' l2 s val <<< doRest
Nothing ->
bottom2 $ getMissingFieldErrorMessage fieldName
where
fieldName :: String
fieldName = reflectSymbol s
l1 = RLProxy :: RLProxy (Cons s1 v1 l1')
l2' = RLProxy :: RLProxy l2'
l2 = RLProxy :: RLProxy l2
s = SProxy :: SProxy s
decodeJson
:: forall f l r
. Bottom2 f String
=> GDecodeJson Builder f Record l Nil () l r
=> Functor f
=> RowToList r l
=> RowToList r l
=> Json
-> f (Record r)
decodeJson json =
map (\builder -> build builder {}) (decodeJson' json)
decodeJson'
:: forall f g l0 l1 l2 p r1 r2
. Bottom2 f String
=> GDecodeJson p f g l0 l1 r1 l2 r2
=> RowToList r1 l1
=> RowToList r2 l2
=> Json
-> f (p (g r1) (g r2))
decodeJson' json = reportJson go json
where
go :: Object Json -> f (p (g r1) (g r2))
go object =
gDecodeJson
(RLProxy :: RLProxy l1)
(RLProxy :: RLProxy l2)
object