diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,3 @@
+# Changelog for hexomorph
+
+## Unreleased changes
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,165 @@
+ GNU LESSER GENERAL PUBLIC LICENSE
+ Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc.
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+ This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
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+
+ As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
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diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,4 @@
+# Haskell Schema Aeson
+
+This a companion package for the `hschema` package providing JSON encoder and decoders for your data types.
+Find more information on how to use this in the `hschema` package.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/hschema-aeson.cabal b/hschema-aeson.cabal
new file mode 100644
--- /dev/null
+++ b/hschema-aeson.cabal
@@ -0,0 +1,100 @@
+cabal-version: 1.12
+
+-- This file has been generated from package.yaml by hpack version 0.31.0.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: 71f8e3ffc184bb6433eed64355bc3b9cf9e12302dadf85d86df8ebf8d4f254f7
+
+name: hschema-aeson
+version: 0.0.1.0
+synopsis: Describe schemas for your Haskell data types.
+description: Please see the README on GitHub at
+category: Data,Schema,JSON
+homepage: https://github.com/alonsodomin/haskell-schema#readme
+bug-reports: https://github.com/alonsodomin/haskell-schema/issues
+author: Antonio Alonso Dominguez
+maintainer: alonso.domin@gmail.com
+copyright: 2018 Antonio Alonso Dominguez
+license: LGPL-3
+license-file: LICENSE
+build-type: Simple
+extra-source-files:
+ README.md
+ ChangeLog.md
+
+source-repository head
+ type: git
+ location: https://github.com/alonsodomin/haskell-schema
+
+library
+ exposed-modules:
+ Data.Schema.JSON
+ Data.Schema.JSON.Internal.Serializer
+ Data.Schema.JSON.Internal.Types
+ Data.Schema.JSON.Simple
+ other-modules:
+ Paths_hschema_aeson
+ hs-source-dirs:
+ src
+ build-depends:
+ QuickCheck
+ , aeson
+ , base >=4.7 && <5
+ , comonad >=5.0 && <5.1
+ , contravariant
+ , free
+ , hschema >=0.0.1.0 && <0.0.2.0
+ , hschema-prettyprinter >=0.0.1.0 && <0.0.2.0
+ , hschema-quickcheck >=0.0.1.0 && <0.0.2.0
+ , lens
+ , mtl
+ , natural-transformation
+ , prettyprinter
+ , prettyprinter-ansi-terminal
+ , quickcheck-instances
+ , scientific
+ , text
+ , time
+ , unordered-containers
+ , vector
+ default-language: Haskell2010
+
+test-suite hschema-test
+ type: exitcode-stdio-1.0
+ main-is: Spec.hs
+ other-modules:
+ Test.Schema.JSON
+ Test.Schema.Model
+ Test.Schema.Utils
+ Paths_hschema_aeson
+ hs-source-dirs:
+ test
+ ghc-options: -threaded -rtsopts -with-rtsopts=-N
+ build-depends:
+ QuickCheck
+ , aeson
+ , base >=4.7 && <5
+ , bytestring
+ , comonad >=5.0 && <5.1
+ , contravariant
+ , convertible
+ , directory
+ , free
+ , hschema
+ , hschema-aeson
+ , hschema-prettyprinter >=0.0.1.0 && <0.0.2.0
+ , hschema-quickcheck >=0.0.1.0 && <0.0.2.0
+ , hspec
+ , lens
+ , mtl
+ , natural-transformation
+ , prettyprinter
+ , prettyprinter-ansi-terminal
+ , quickcheck-instances
+ , scientific
+ , text
+ , time
+ , unordered-containers
+ , vector
+ default-language: Haskell2010
diff --git a/src/Data/Schema/JSON.hs b/src/Data/Schema/JSON.hs
new file mode 100644
--- /dev/null
+++ b/src/Data/Schema/JSON.hs
@@ -0,0 +1,26 @@
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+module Data.Schema.JSON
+ ( JsonType
+ , JsonSchema
+ , JsonField
+ , JsonSerializer(..)
+ , JsonDeserializer(..)
+ , ToJsonSerializer(..)
+ , ToJsonDeserializer(..)
+ , JsonPrimitive(..)
+ ) where
+
+import Data.Aeson (FromJSON (parseJSON),
+ ToJSON (toJSON))
+import Data.Schema
+import Data.Schema.JSON.Internal.Serializer
+import Data.Schema.JSON.Internal.Types
+
+instance (HasSchema a, ToJsonSerializer (PrimitivesOf a)) => ToJSON a where
+ toJSON = runJsonSerializer . toJsonSerializer $ getSchema
+
+instance (HasSchema a, ToJsonDeserializer (PrimitivesOf a)) => FromJSON a where
+ parseJSON = runJsonDeserializer . toJsonDeserializer $ getSchema
diff --git a/src/Data/Schema/JSON/Internal/Serializer.hs b/src/Data/Schema/JSON/Internal/Serializer.hs
new file mode 100644
--- /dev/null
+++ b/src/Data/Schema/JSON/Internal/Serializer.hs
@@ -0,0 +1,107 @@
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE TypeSynonymInstances #-}
+{-# LANGUAGE UndecidableInstances #-}
+
+module Data.Schema.JSON.Internal.Serializer where
+
+import Control.Applicative.Free
+import Control.Functor.HigherOrder
+import Control.Lens hiding (iso)
+import Control.Monad.State (State)
+import qualified Control.Monad.State as ST
+import Control.Natural
+import qualified Data.Aeson.Types as JSON
+import Data.Functor.Contravariant
+import Data.Functor.Sum
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as Map
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.List.NonEmpty as NEL
+import Data.Maybe
+import Data.Schema.Internal.Types
+import Data.Text (Text)
+
+newtype JsonSerializer a = JsonSerializer { runJsonSerializer :: a -> JSON.Value }
+
+instance Contravariant JsonSerializer where
+ contramap f (JsonSerializer g) = JsonSerializer $ g . f
+
+newtype JsonDeserializer a = JsonDeserializer { runJsonDeserializer :: JSON.Value -> JSON.Parser a }
+
+instance Functor JsonDeserializer where
+ fmap f (JsonDeserializer g) = JsonDeserializer $ \x -> fmap f (g x)
+
+instance Applicative JsonDeserializer where
+ pure x = JsonDeserializer $ \_ -> pure x
+ (JsonDeserializer l) <*> (JsonDeserializer r) = JsonDeserializer $ \x -> (l x) <*> (r x)
+
+class ToJsonSerializer s where
+ toJsonSerializer :: s ~> JsonSerializer
+
+class ToJsonDeserializer s where
+ toJsonDeserializer :: s ~> JsonDeserializer
+
+instance (ToJsonSerializer p, ToJsonSerializer q) => ToJsonSerializer (Sum p q) where
+ toJsonSerializer (InL l) = toJsonSerializer l
+ toJsonSerializer (InR r) = toJsonSerializer r
+
+toJsonSerializerAlg :: ToJsonSerializer p => HAlgebra (SchemaF p) JsonSerializer
+toJsonSerializerAlg = wrapNT $ \case
+ PrimitiveSchema p -> toJsonSerializer p
+
+ RecordSchema fields -> JsonSerializer $ \obj -> JSON.Object $ ST.execState (runAp (encodeFieldOf obj) (unwrapField fields)) Map.empty
+ where encodeFieldOf :: o -> FieldDef o JsonSerializer v -> State (HashMap Text JSON.Value) v
+ encodeFieldOf o (RequiredField name (JsonSerializer serialize) getter) = do
+ let el = view getter o
+ ST.modify $ Map.insert name (serialize el)
+ return el
+ encodeFieldOf o (OptionalField name (JsonSerializer serialize) getter) = do
+ let el = view getter o
+ ST.modify $ Map.insert name (maybe JSON.Null serialize el)
+ return el
+
+ UnionSchema alts -> JsonSerializer $ \value -> head . catMaybes . NEL.toList $ fmap (encodeAlt value) alts
+ where singleAttrObj :: Text -> JSON.Value -> JSON.Value
+ singleAttrObj n v = JSON.Object $ Map.insert n v Map.empty
+
+ encodeAlt :: o -> AltDef JsonSerializer o -> Maybe JSON.Value
+ encodeAlt o (AltDef name (JsonSerializer serialize) pr) = do
+ json <- serialize <$> o ^? pr
+ return $ singleAttrObj name json
+
+ AliasSchema (JsonSerializer base) iso -> JsonSerializer $ \value -> base (view (re iso) value)
+
+instance ToJsonSerializer p => ToJsonSerializer (Schema p) where
+ toJsonSerializer schema = (cataNT toJsonSerializerAlg) (unwrapSchema schema)
+
+instance (ToJsonDeserializer p, ToJsonDeserializer q) => ToJsonDeserializer (Sum p q) where
+ toJsonDeserializer (InL l) = toJsonDeserializer l
+ toJsonDeserializer (InR r) = toJsonDeserializer r
+
+toJsonDeserializerAlg :: ToJsonDeserializer p => HAlgebra (SchemaF p) JsonDeserializer
+toJsonDeserializerAlg = wrapNT $ \case
+ PrimitiveSchema p -> toJsonDeserializer p
+
+ RecordSchema fields -> JsonDeserializer $ \json -> case json of
+ JSON.Object obj -> runAp decodeField $ unwrapField fields
+ where decodeField :: FieldDef o JsonDeserializer v -> JSON.Parser v
+ decodeField (RequiredField name (JsonDeserializer deserial) _) = JSON.explicitParseField deserial obj name
+ decodeField (OptionalField name (JsonDeserializer deserial) _) = JSON.explicitParseFieldMaybe deserial obj name
+ other -> fail $ "Expected JSON Object but got: " ++ (show other)
+
+ UnionSchema alts -> JsonDeserializer $ \json -> case json of
+ JSON.Object obj -> head . catMaybes . NEL.toList $ fmap lookupParser alts
+ where lookupParser :: AltDef JsonDeserializer a -> Maybe (JSON.Parser a)
+ lookupParser (AltDef name (JsonDeserializer deserial) pr) = do
+ altParser <- deserial <$> Map.lookup name obj
+ return $ (view $ re pr) <$> altParser
+ other -> fail $ "Expected JSON Object but got: " ++ (show other)
+
+ AliasSchema (JsonDeserializer base) iso -> JsonDeserializer $ \json -> (view iso) <$> (base json)
+
+instance ToJsonDeserializer p => ToJsonDeserializer (Schema p) where
+ toJsonDeserializer schema = (cataNT toJsonDeserializerAlg) (unwrapSchema schema)
diff --git a/src/Data/Schema/JSON/Internal/Types.hs b/src/Data/Schema/JSON/Internal/Types.hs
new file mode 100644
--- /dev/null
+++ b/src/Data/Schema/JSON/Internal/Types.hs
@@ -0,0 +1,91 @@
+{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE TypeSynonymInstances #-}
+
+module Data.Schema.JSON.Internal.Types where
+
+import Control.Applicative (liftA2)
+import Control.Functor.HigherOrder
+import Data.Aeson (parseJSON)
+import qualified Data.Aeson.Types as JSON
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as Map
+import Data.Schema.Internal.Types
+import Data.Schema.JSON.Internal.Serializer
+import Data.Schema.PrettyPrint
+import Data.Scientific
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Text.Prettyprint.Doc ((<+>))
+import qualified Data.Text.Prettyprint.Doc as PP
+import Data.Vector (Vector)
+import qualified Data.Vector as Vector
+import qualified Test.QuickCheck as QC
+import qualified Test.QuickCheck.Gen as QC
+import Test.QuickCheck.Instances.Scientific ()
+import Test.Schema.QuickCheck.Internal.Gen
+
+data JsonPrimitive (f :: (* -> *)) (a :: *) where
+ JsonNumber :: JsonPrimitive f Scientific
+ JsonText :: JsonPrimitive f Text
+ JsonBool :: JsonPrimitive f Bool
+ JsonArray :: f a -> JsonPrimitive f (Vector a)
+ JsonMap :: f a -> JsonPrimitive f (HashMap Text a)
+
+type JsonType = HMutu JsonPrimitive Schema
+
+-- | Simple JSON schema type
+type JsonSchema = Schema JsonType
+
+-- | Simple JSON field type
+type JsonField o a = Field JsonSchema o a
+
+instance ToJsonSerializer JsonType where
+ toJsonSerializer jType = JsonSerializer $ case (unmutu jType) of
+ JsonNumber -> JSON.Number
+ JsonText -> JSON.String
+ JsonBool -> JSON.Bool
+ JsonArray value -> \x ->
+ JSON.Array $ fmap (runJsonSerializer . toJsonSerializer $ value) x
+ JsonMap value -> \x ->
+ JSON.Object $ Map.map (runJsonSerializer . toJsonSerializer $ value) x
+
+instance ToJsonDeserializer JsonType where
+ toJsonDeserializer jType = JsonDeserializer $ case (unmutu jType) of
+ JsonNumber -> parseJSON
+ JsonText -> parseJSON
+ JsonBool -> parseJSON
+ JsonArray value -> \case
+ JSON.Array arr -> traverse (runJsonDeserializer . toJsonDeserializer $ value) arr
+ other -> fail $ "Expected a JSON array but got: " ++ (show other)
+ JsonMap value -> \case
+ JSON.Object obj -> Map.foldrWithKey Map.insert Map.empty <$> traverse (runJsonDeserializer . toJsonDeserializer $ value) obj
+ other -> fail $ "Expected a JSON object but got: " ++ (show other)
+
+instance ToGen JsonType where
+ toGen jType = case (unmutu jType) of
+ JsonNumber -> QC.arbitrary
+ JsonText -> T.pack <$> (QC.listOf QC.chooseAny)
+ JsonBool -> QC.arbitrary :: (QC.Gen Bool)
+ JsonArray value -> Vector.fromList <$> QC.listOf (toGen value)
+ JsonMap value -> Map.fromList <$> (QC.listOf $ liftA2 ((,)) (T.pack <$> (QC.listOf QC.chooseAny)) (toGen value))
+
+instance ToSchemaDoc JsonType where
+ toSchemaDoc jType = SchemaDoc $ case (unmutu jType) of
+ JsonNumber -> PP.pretty "Number"
+ JsonText -> PP.pretty "Text"
+ JsonBool -> PP.pretty "Bool"
+ JsonArray value -> PP.pretty "[" <> (getDoc . toSchemaDoc $ value) <> PP.pretty "]"
+ JsonMap value -> PP.pretty "Map { Text ->" <+> (getDoc . toSchemaDoc $ value) <+> PP.pretty "}"
+
+instance ToSchemaLayout JsonType where
+ toSchemaLayout jType = SchemaLayout $ case (unmutu jType) of
+ JsonNumber -> PP.unsafeViaShow
+ JsonText -> PP.unsafeViaShow
+ JsonBool -> PP.unsafeViaShow
+ JsonArray value -> \x ->
+ PP.vsep $ fmap (\v -> runSchemaLayout (toSchemaLayout value) v) $ Vector.toList x
+ JsonMap value -> \x ->
+ PP.vsep $ fmap (\(k,v) -> PP.pretty k <+> PP.pretty "->" <+> runSchemaLayout (toSchemaLayout value) v) $ Map.toList x
diff --git a/src/Data/Schema/JSON/Simple.hs b/src/Data/Schema/JSON/Simple.hs
new file mode 100644
--- /dev/null
+++ b/src/Data/Schema/JSON/Simple.hs
@@ -0,0 +1,46 @@
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE LiberalTypeSynonyms #-}
+{-# LANGUAGE RankNTypes #-}
+
+module Data.Schema.JSON.Simple where
+
+import Control.Functor.HigherOrder
+import Control.Lens
+import Data.HashMap.Strict (HashMap)
+import Data.Schema
+import Data.Schema.Internal.Types
+import Data.Schema.JSON.Internal.Types
+import Data.Scientific
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Vector (Vector)
+
+-- | Define a text primitive
+text :: JsonSchema Text
+text = prim $ HMutu JsonText
+
+-- | Define a string primitive
+string :: JsonSchema String
+string = alias (iso T.unpack T.pack) text
+
+-- | Define a scientific number primitive
+number :: JsonSchema Scientific
+number = prim $ HMutu JsonNumber
+
+-- | Define an integral primitive
+int :: Integral a => JsonSchema a
+int = alias (iso (\x -> either truncate id $ floatingOrInteger x) fromIntegral) number
+
+-- | Define a floating point primitive
+real :: RealFloat a => JsonSchema a
+real = alias (iso (\x -> either id fromIntegral $ floatingOrInteger x) fromFloatDigits) number
+
+array :: JsonSchema a -> JsonSchema (Vector a)
+array elemSchema = prim $ HMutu (JsonArray elemSchema)
+
+list :: JsonSchema a -> JsonSchema [a]
+list = toList . array
+
+hash :: JsonSchema a -> JsonSchema (HashMap Text a)
+hash elemSchema = prim $ HMutu (JsonMap elemSchema)
diff --git a/test/Spec.hs b/test/Spec.hs
new file mode 100644
--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,4 @@
+import Test.Schema.JSON
+
+main :: IO ()
+main = verifyJsonSchema
diff --git a/test/Test/Schema/JSON.hs b/test/Test/Schema/JSON.hs
new file mode 100644
--- /dev/null
+++ b/test/Test/Schema/JSON.hs
@@ -0,0 +1,45 @@
+module Test.Schema.JSON
+ ( verifyJsonSchema
+ ) where
+
+import Data.Aeson
+import Data.Aeson.Text
+import Data.Convertible
+import Data.Schema.JSON
+import qualified Data.Text.Lazy as T
+import Test.Hspec
+import Test.QuickCheck
+import Test.Schema.Model
+import Test.Schema.Utils
+
+samplePerson :: Person
+samplePerson = Person "foo" (Just $ convert (12 :: Int)) [
+ mkUserRole
+ , mkAdminRole "bar" 4
+ ]
+
+samplePersonJSONFileName :: String
+samplePersonJSONFileName = "expected-model.json"
+
+samplePersonJSON :: IO String
+samplePersonJSON = loadTestFile samplePersonJSONFileName
+
+prop_reverse :: Person -> Bool
+prop_reverse person = decode (encode person) == (Just person)
+
+describeJsonSerialization :: IO ()
+describeJsonSerialization = hspec $ do
+ describe "toJsonSerializer" $ do
+ it "should generate valid JSON" $ do
+ expectedJSON <- samplePersonJSON
+ (T.unpack $ encodeToLazyText samplePerson) `shouldBe` expectedJSON
+
+ it "should parse the given JSON" $ do
+ givenJSON <- samplePersonJSON
+ decodedPerson <- decodeFileStrict =<< testFilePath samplePersonJSONFileName
+ decodedPerson `shouldBe` (Just samplePerson)
+
+verifyJsonSchema :: IO ()
+verifyJsonSchema = do
+ quickCheck prop_reverse
+ describeJsonSerialization
diff --git a/test/Test/Schema/Model.hs b/test/Test/Schema/Model.hs
new file mode 100644
--- /dev/null
+++ b/test/Test/Schema/Model.hs
@@ -0,0 +1,75 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TypeFamilies #-}
+
+module Test.Schema.Model where
+
+import Control.Lens
+import Data.Aeson
+import Data.Convertible
+import Data.Schema (HasSchema (..))
+import qualified Data.Schema as S
+import Data.Schema.JSON
+import qualified Data.Schema.JSON.Simple as JSON
+import Data.Time (UTCTime)
+import Test.QuickCheck
+import Test.Schema.QuickCheck
+
+utcTimeSchema :: JsonSchema UTCTime
+utcTimeSchema = S.alias (iso convert convert) (JSON.int :: JsonSchema Integer)
+
+data Role =
+ UserRole UserRole
+ | AdminRole AdminRole
+ deriving (Eq, Show)
+
+data UserRole = UserRole'
+ deriving (Eq, Show)
+
+data AdminRole = AdminRole' { department :: String, subordinateCount :: Int }
+ deriving (Eq, Show)
+
+mkUserRole :: Role
+mkUserRole = UserRole $ UserRole'
+
+mkAdminRole :: String -> Int -> Role
+mkAdminRole dpt subs = AdminRole $ AdminRole' dpt subs
+
+_UserRole :: Prism' Role UserRole
+_UserRole = prism' UserRole $ \case
+ UserRole x -> Just x
+ _ -> Nothing
+
+_AdminRole :: Prism' Role AdminRole
+_AdminRole = prism' AdminRole $ \case
+ AdminRole x -> Just x
+ _ -> Nothing
+
+adminRole :: JsonSchema AdminRole
+adminRole = S.record
+ ( AdminRole'
+ <$> S.field "department" JSON.string (to department)
+ <*> S.field "subordinateCount" JSON.int (to subordinateCount)
+ )
+
+roleSchema :: JsonSchema Role
+roleSchema = S.oneOf
+ [ S.alt "user" (S.const UserRole') _UserRole
+ , S.alt "admin" adminRole _AdminRole
+ ]
+
+data Person = Person { personName :: String, birthDate :: Maybe UTCTime, roles :: [Role] }
+ deriving (Eq, Show)
+
+personSchema :: JsonSchema Person
+personSchema = S.record
+ ( Person
+ <$> S.field "name" JSON.string (to personName)
+ <*> S.optional "birthDate" utcTimeSchema (to birthDate)
+ <*> S.field "roles" (JSON.list roleSchema) (to roles)
+ )
+
+instance HasSchema Person where
+ type PrimitivesOf Person = JsonType
+
+ getSchema = personSchema
diff --git a/test/Test/Schema/Utils.hs b/test/Test/Schema/Utils.hs
new file mode 100644
--- /dev/null
+++ b/test/Test/Schema/Utils.hs
@@ -0,0 +1,17 @@
+module Test.Schema.Utils where
+
+import System.Directory
+import System.IO
+
+getTestFolder :: IO FilePath
+getTestFolder = do
+ baseDir <- getCurrentDirectory
+ return $ baseDir ++ "/test/"
+
+testFilePath :: String -> IO String
+testFilePath f = do
+ testDir <- getTestFolder
+ return $ testDir ++ f
+
+loadTestFile :: String -> IO String
+loadTestFile f = testFilePath f >>= readFile