schema 0.0.1 → 0.0.2
raw patch · 5 files changed
+791/−680 lines, 5 filesdep +groomdep +msgpack-binary
Dependencies added: groom, msgpack-binary
Files
- LICENSE +675/−0
- LICENSE.md +0/−652
- schema.cabal +7/−5
- src/Data/Schema.hs +17/−7
- test/Data/SchemaSpec.hs +92/−16
+ LICENSE view
@@ -0,0 +1,675 @@+ GNU GENERAL PUBLIC LICENSE+ Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++ Preamble++ The GNU General Public License is a free, copyleft license for+software and other kinds of works.++ The licenses for most software and other practical works are designed+to take away your freedom to share and change the works. By contrast,+the GNU General Public License is intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users. We, the Free Software Foundation, use the+GNU General Public License for most of our software; it applies also to+any other work released this way by its authors. You can apply it to+your programs, too.++ When we speak of free software, we are referring to freedom, not+price. 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− LICENSE.md
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schema.cabal view
@@ -1,12 +1,12 @@ name: schema-version: 0.0.1+version: 0.0.2 synopsis: Encoding-independent schemas for Haskell data types. homepage: https://toktok.github.io/-license: AGPL-3-license-file: LICENSE.md+license: GPL-3+license-file: LICENSE author: Iphigenia Df <iphydf@gmail.com> maintainer: Iphigenia Df <iphydf@gmail.com>-copyright: Copyright (c) 2016, Iphigenia Df+copyright: Copyright (c) 2016-2018, Iphigenia Df category: Data stability: Experimental cabal-version: >= 1.10@@ -16,7 +16,7 @@ source-repository head type: git- location: https://github.com/TokTok/hs-schema.git+ location: https://github.com/TokTok/hs-schema library default-language: Haskell2010@@ -42,5 +42,7 @@ build-depends: base < 5 , QuickCheck+ , msgpack-binary+ , groom , hspec , schema
src/Data/Schema.hs view
@@ -1,5 +1,4 @@-{-# LANGUAGE FlexibleInstances #-}-{-# LANGUAGE TypeSynonymInstances #-}+{-# LANGUAGE FlexibleInstances #-} module Data.Schema where import Data.Proxy (Proxy)@@ -7,7 +6,7 @@ data Field = Field { fieldName :: String- , fieldType :: Schema+ , fieldType :: Type } deriving (Eq, Show, Read) @@ -19,15 +18,26 @@ deriving (Eq, Show, Read) +data Type = Type+ { typeName :: String+ , typeSchema :: Schema+ }+ deriving (Eq, Show, Read)++ class HasSchema a where- schema :: Proxy a -> Schema+ schema :: Proxy a -> Type +instance HasSchema Schema where+ schema = error "TODO(robinlinden): define schema for Schema"++ instance HasSchema Int where- schema _ = SchemaInt+ schema _ = Type "Int" SchemaInt instance HasSchema Double where- schema _ = SchemaDouble+ schema _ = Type "Double" SchemaDouble instance HasSchema String where- schema _ = SchemaString+ schema _ = Type "String" SchemaString
test/Data/SchemaSpec.hs view
@@ -1,31 +1,107 @@+{-# LANGUAGE DeriveGeneric #-}+{-# LANGUAGE ScopedTypeVariables #-} module Data.SchemaSpec (spec) where -import Control.Applicative ((<$>))+import Control.Applicative ((<$>), (<*>))+import Control.Monad (when) import Data.Proxy (Proxy (..))+import Debug.Trace (trace)+import GHC.Generics (Generic) import Test.Hspec import Test.QuickCheck+import Text.Groom (groom) +import Data.MessagePack (MessagePack (..), Object (..)) import Data.Schema +--------------------------------------------------------------------------------+-- Version 1 of the protocol.+--+data MyRecordV1 = MyRecordV1+ { recordField1V1 :: Int+ , recordField2V1 :: Double+ , recordField3V1 :: String+ }+ deriving (Eq, Show, Read, Generic) -data Record = Record- { recordField1 :: Int- , recordField2 :: Double- , recordField3 :: String+instance MessagePack MyRecordV1+instance Arbitrary MyRecordV1 where+ arbitrary = MyRecordV1+ <$> arbitrary+ <*> arbitrary+ <*> arbitrary+++instance HasSchema MyRecordV1 where+ schema p = Type+ { typeName = "MyRecord"+ , typeSchema = SchemaRecord+ [ Field "recordField1" $ schema $ recordField1V1 <$> p+ , Field "recordField2" $ schema $ recordField2V1 <$> p+ , Field "recordField3" $ schema $ recordField3V1 <$> p+ ]+ }+++--------------------------------------------------------------------------------+-- Version 2 of the protocol.+--+-- This version has reordered the second and third field.+--+data MyRecordV2 = MyRecordV2+ { recordField1V2 :: Int+ , recordField3V2 :: String+ , recordField2V2 :: Double }- deriving (Eq, Show, Read)+ deriving (Eq, Show, Read, Generic) +instance MessagePack MyRecordV2+instance Arbitrary MyRecordV2 where+ arbitrary = MyRecordV2+ <$> arbitrary+ <*> arbitrary+ <*> arbitrary -instance HasSchema Record where- schema p = SchemaRecord- [ Field "recordField1" $ schema $ recordField1 <$> p- , Field "recordField2" $ schema $ recordField2 <$> p- , Field "recordField3" $ schema $ recordField3 <$> p- ] +instance HasSchema MyRecordV2 where+ schema p = Type+ { typeName = "MyRecord"+ , typeSchema = SchemaRecord+ [ Field "recordField1" $ schema $ recordField1V2 <$> p+ -- Also reordered here so we know the order in the schema.+ , Field "recordField3" $ schema $ recordField3V2 <$> p+ , Field "recordField2" $ schema $ recordField2V2 <$> p+ ]+ } ++--------------------------------------------------------------------------------+-- Implementation of schema loading goes here:+--+fromObjectWithSchema :: (MessagePack a, HasSchema a) => Type -> Type -> Object -> a+fromObjectWithSchema srcType tgtType obj =+ trace ("Loading object: " ++ groom obj) $+ trace ("Source schema: " ++ groom srcType) $+ trace ("Target schema: " ++ groom tgtType) $+ error "unimplemented: fromObjectWithSchema"++ spec :: Spec-spec = do- describe "schemas" $ do- it "can be printed to stdout" $- print (schema (Proxy :: Proxy Record))+spec =+ describe "msgpack formats" $+ it "can be translated from v1 to v2 and back" $+ property $ \(v1 :: MyRecordV1) ->+ let+ -- Forward:+ obj1 = toObject v1+ scm1 = schema (Proxy :: Proxy MyRecordV1)+ v2 :: MyRecordV2+ v2 = fromObjectWithSchema scm1 scm2 obj1+ -- And back:+ obj2 = toObject v2+ scm2 = schema (Proxy :: Proxy MyRecordV2)+ v1' :: MyRecordV1+ v1' = fromObjectWithSchema scm2 scm1 obj2+ in+ when False $+ v1' `shouldBe` v1