initial import

Author: Antonio Alonso Dominguez

.gitignore

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+.stack-work/
+hexomorph.cabal
+*~

ChangeLog.md

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+# Changelog for hexomorph
+
+## Unreleased changes

LICENSE

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+Copyright Author name here (c) 2018
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Author name here nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# hexomorph

Setup.hs

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+import Distribution.Simple
+main = defaultMain

package.yaml

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+name:                hexomorph
+version:             0.1.0.0
+github:              "githubuser/hexomorph"
+license:             BSD3
+author:              "Author name here"
+maintainer:          "[email protected]"
+copyright:           "2018 Author name here"
+
+extra-source-files:
+- README.md
+- ChangeLog.md
+
+# Metadata used when publishing your package
+# synopsis:            Short description of your package
+# category:            Web
+
+# To avoid duplicated efforts in documentation and dealing with the
+# complications of embedding Haddock markup inside cabal files, it is
+# common to point users to the README.md file.
+description:         Please see the README on GitHub at <https://github.com/githubuser/hexomorph#readme>
+
+dependencies:
+- aeson
+- base >= 4.7 && < 5
+- mtl
+- natural-transformation
+- lens
+- free
+- text
+- time
+- unordered-containers
+- vector
+
+library:
+  source-dirs: src
+
+tests:
+  hexomorph-test:
+    main:                Spec.hs
+    source-dirs:         test
+    ghc-options:
+    - -threaded
+    - -rtsopts
+    - -with-rtsopts=-N
+    dependencies:
+    - hexomorph

src/Data/Schema.hs

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+module Data.Schema
+     ( module Data.Schema.JSON
+     , module Data.Schema.Types
+     ) where
+
+import Data.Schema.JSON
+import Data.Schema.Types

src/Data/Schema/JSON.hs

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+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ExistentialQuantification #-}
+
+module Data.Schema.JSON
+     ( serializer
+     , deserializer
+     ) where
+
+import Data.Aeson (parseJSON)
+import qualified Data.Aeson as Json
+import qualified Data.Aeson.Types as Json
+import Data.Schema.Types
+import Control.Applicative.Free
+import Control.Lens
+import Control.Monad.State (State)
+import qualified Control.Monad.State as ST
+import Data.HashMap.Strict (HashMap)
+import qualified Data.HashMap.Strict as Map
+import Data.Text (Text)
+
+serializer :: Serializer a Json.Value
+serializer IntSchema = Json.Number . fromIntegral
+serializer BoolSchema = Json.Bool
+serializer StringSchema = Json.String
+serializer (ListSchema s) = \a -> Json.Array $ fmap (serializer s) a
+serializer (RecordSchema ps) = \value -> Json.Object $ ST.execState (runAp (step value) ps) Map.empty
+  where step :: o -> PropDef o v -> State (HashMap Text Json.Value) v
+        step obj (PropDef name schema getter) = do
+            let el = view getter obj
+            ST.modify $ Map.insert name (serializer schema $ el)
+            return el
+serializer (UnionSchema alts) = undefined
+
+deserializer :: Schema a -> (Json.Value -> Json.Parser a)
+deserializer IntSchema = parseJSON
+deserializer BoolSchema = parseJSON
+deserializer StringSchema = parseJSON
+deserializer (ListSchema s) = \json -> case json of
+  Json.Array v -> traverse (deserializer s) v
+  other        -> fail $ "Expected a JSON array but got: " ++ (show other)
+deserializer (RecordSchema ps) = \json -> case json of
+  Json.Object obj -> runAp (step obj) ps
+    where step :: HashMap Text Json.Value -> PropDef o v -> Json.Parser v
+          step jsonObj (PropDef name schema _) =
+            Json.explicitParseField (\v -> deserializer schema $ v) jsonObj name
+  other -> fail $ "Expected JSON Object but got: " ++ (show other)
+deserializer (UnionSchema alts) = undefined

src/Data/Schema/Types.hs

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+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE RankNTypes #-}
+
+module Data.Schema.Types where
+
+import Control.Applicative.Free
+import Control.Lens
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Vector (Vector)
+
+data PropDef o a = PropDef
+  { propName :: Text
+  , propSchema :: Schema a
+  , propAccessor :: Getter o a
+  }
+
+type Props o = Ap (PropDef o) o
+
+-- propDef :: Text -> Schema a -> Getter o a -> Props o
+-- propDef name schema get = liftAp $ ((PropDef name schema get) :: PropDef o a)
+
+-- required :: PropDef o a -> Props o
+-- required = liftAp
+
+--type Props a = Props' a a
+
+-- emptyProps :: forall a. Props' a ()
+-- emptyProps = Pure ()
+
+data Alt a = forall b. Alt
+  { altId :: Text
+  , altSchema :: Schema b
+  , altPrism :: Prism' a b
+  }
+
+data Schema a where
+  IntSchema :: Schema Int
+  BoolSchema :: Schema Bool
+  StringSchema :: Schema Text
+  NoSchema :: Schema ()
+  ListSchema :: Schema a -> Schema (Vector a)
+  RecordSchema :: Props o -> Schema o
+  UnionSchema :: [Alt a] -> Schema a
+
+-- voidGetter :: forall a. Getter a ()
+-- voidGetter = to (const ())
+
+-- emptyRecord :: forall a. Schema a
+-- emptyRecord =
+--   let voidPropDef :: PropDef a ()
+--       voidPropDef = PropDef T.empty NoSchema voidGetter
+
+--       lifted :: Props a
+--       lifted = liftAp voidPropDef
+--   in RecordSchema lifted
+
+type Serializer a b   = Schema a -> (a -> b)
+type Deserializer a b = Schema b -> (a -> Either String b)

src/Lib.hs

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+{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE DeriveFunctor #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE TypeOperators #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE LambdaCase #-}
+
+module Lib
+    ( someFunc
+    ) where
+
+import Control.Applicative.Free
+import Control.Lens
+import Data.Schema
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Time.Clock
+
+stringIso :: Iso' String Text
+stringIso = iso T.pack T.unpack
+
+data Role =
+    UserRole UserRole
+  | AdminRole AdminRole
+  deriving (Eq, Show)
+
+data UserRole = UserRole' { userName :: Text }
+  deriving (Eq, Show)
+
+data AdminRole = AdminRole' { department :: Text, subordinateCount :: Int }
+  deriving (Eq, Show)
+
+_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
+
+adminDept :: Getter AdminRole Text
+adminDept = to department
+
+subordinateCountGetter :: Getter AdminRole Int
+subordinateCountGetter = to subordinateCount
+
+userNameProp = liftAp $ PropDef "name" StringSchema (to userName)
+userRoleAlt = Alt "user" (RecordSchema (UserRole' <$> userNameProp)) _UserRole
+
+departmentProp = liftAp $ PropDef "department" StringSchema adminDept
+subordinateCountProp = liftAp $ PropDef "subordinateCount" IntSchema subordinateCountGetter
+adminRoleAlt = Alt "admin" (RecordSchema (AdminRole' <$> departmentProp <*> subordinateCountProp)) _AdminRole
+
+userSchema :: Schema Role
+userSchema = UnionSchema [userRoleAlt, adminRoleAlt]
+
+data Person1 = Person1 { aName :: String, aAge :: Int }
+
+data Person = Person { name :: String, birthDate :: UTCTime, roles :: [Role] }
+
+someFunc :: IO ()
+someFunc = putStrLn "someFunc"

stack.yaml

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+# This file was automatically generated by 'stack init'
+#
+# Some commonly used options have been documented as comments in this file.
+# For advanced use and comprehensive documentation of the format, please see:
+# https://docs.haskellstack.org/en/stable/yaml_configuration/
+
+# Resolver to choose a 'specific' stackage snapshot or a compiler version.
+# A snapshot resolver dictates the compiler version and the set of packages
+# to be used for project dependencies. For example:
+#
+# resolver: lts-3.5
+# resolver: nightly-2015-09-21
+# resolver: ghc-7.10.2
+# resolver: ghcjs-0.1.0_ghc-7.10.2
+#
+# The location of a snapshot can be provided as a file or url. Stack assumes
+# a snapshot provided as a file might change, whereas a url resource does not.
+#
+# resolver: ./custom-snapshot.yaml
+# resolver: https://example.com/snapshots/2018-01-01.yaml
+resolver: lts-11.13
+
+# User packages to be built.
+# Various formats can be used as shown in the example below.
+#
+# packages:
+# - some-directory
+# - https://example.com/foo/bar/baz-0.0.2.tar.gz
+# - location:
+#    git: https://github.com/commercialhaskell/stack.git
+#    commit: e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+# - location: https://github.com/commercialhaskell/stack/commit/e7b331f14bcffb8367cd58fbfc8b40ec7642100a
+#  subdirs:
+#  - auto-update
+#  - wai
+packages:
+- .
+# Dependency packages to be pulled from upstream that are not in the resolver
+# using the same syntax as the packages field.
+# (e.g., acme-missiles-0.3)
+extra-deps: []
+# - category-extras-1.0.2
+# - categories-1.0.7
+# - comonad-extras-4.0
+# - comonad-transformers-4.0
+# - comonads-fd-4.0
+# - groupoids-4.0
+# - indexed-0.1.3
+# - indexed-extras-0.2
+# - profunctor-extras-4.0
+# - representable-functors-3.2.0.2
+# - representable-profunctors-3.2
+
+# Override default flag values for local packages and extra-deps
+# flags: {}
+
+# Extra package databases containing global packages
+# extra-package-dbs: []
+
+# Control whether we use the GHC we find on the path
+# system-ghc: true
+#
+# Require a specific version of stack, using version ranges
+# require-stack-version: -any # Default
+# require-stack-version: ">=1.7"
+#
+# Override the architecture used by stack, especially useful on Windows
+# arch: i386
+# arch: x86_64
+#
+# Extra directories used by stack for building
+# extra-include-dirs: [/path/to/dir]
+# extra-lib-dirs: [/path/to/dir]
+#
+# Allow a newer minor version of GHC than the snapshot specifies
+# compiler-check: newer-minor

test/Spec.hs

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+main :: IO ()
+main = putStrLn "Test suite not yet implemented"