bson-generics (empty) → 0.0.1

raw patch · 4 files changed

+201/−0 lines, 4 filesdep +basedep +bsondep +ghc-primsetup-changed

Dependencies added: base, bson, ghc-prim

Files

LICENSE +30/−0
Setup.hs +2/−0
bson-generics.cabal +35/−0
src/Data/Bson/Generics.hs +134/−0

+ LICENSE view

@@ -0,0 +1,30 @@+Copyright (c) 2012, Petr Pilař++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 Petr Pilař 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.

+ Setup.hs view

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

+ bson-generics.cabal view

@@ -0,0 +1,35 @@+Name:                bson-generics+Version:             0.0.1+Synopsis:            Generics functionality for BSON+Description:         This package offers easy conversion from and to BSON data type for most of user defined data types.+License:             BSD3+License-file:        LICENSE+Author:              Petr Pilař+Maintainer:          the.palmik+maintainer@gmail.com+Category:            Data++Build-type:          Simple++Cabal-version:       >= 1.6++Source-repository head+  type:     git+  location: git://github.com:Palmik/bson-generics.git++Library+  hs-source-dirs: src++  Exposed-modules:+    Data.Bson.Generics+  +  Build-depends:+    base        >= 4 && < 5,+    ghc-prim    >= 0.2,+    bson        >= 0.1.7 && < 0.2+  +  -- Modules not exported by this package.+  -- Other-modules:       +  +  -- Extra tools (e.g. alex, hsc2hs, ...) needed to build the source.+  -- Build-tools:         +

+ src/Data/Bson/Generics.hs view

@@ -0,0 +1,134 @@+{-# LANGUAGE DeriveGeneric          #-}+{-# LANGUAGE DefaultSignatures      #-}+{-# LANGUAGE TypeOperators          #-}+{-# LANGUAGE FlexibleContexts       #-}+{-# LANGUAGE TypeSynonymInstances   #-}+{-# LANGUAGE FlexibleInstances      #-}+{-# LANGUAGE UndecidableInstances   #-}+{-# LANGUAGE DeriveDataTypeable     #-}+{-# LANGUAGE MultiParamTypeClasses  #-}+{-# LANGUAGE ScopedTypeVariables    #-}++module Data.Bson.Generics+( FromBSON(..)+, ToBSON(..)+) where++import           GHC.Generics+import qualified Data.Bson as BSON (lookup)+import           Data.Bson+import           Data.UString (u)+import           Data.Typeable+import           Control.Monad++------------------------------------------------------------------------------++instance (FromBSON a, ToBSON a, Typeable a, Show a, Eq a) => Val a where+    val         x = Doc $ toBSON x+    cast' (Doc x) = fromBSON x+    cast' _       = Nothing++------------------------------------------------------------------------------++class ToBSON a where+    toBSON :: a -> Document++    default toBSON :: (Generic a, GenericToBSON (Rep a)) => a -> Document+    toBSON a = genericToBSON (from a)++class GenericToBSON f where+    genericToBSON :: f a -> Document++-- | Unit type -> Empty document+instance GenericToBSON U1 where+    genericToBSON U1 = []++-- | Sum of types+instance (GenericToBSON a, GenericToBSON b) => GenericToBSON (a :*: b) where+    genericToBSON (x :*: y) = genericToBSON x ++ genericToBSON y++-- | Product of types+instance (GenericToBSON a, GenericToBSON b) => GenericToBSON (a :+: b) where+    genericToBSON (L1 x) = genericToBSON x+    genericToBSON (R1 x) = genericToBSON x++-- | Datatype information tag+instance (GenericToBSON a) => GenericToBSON (D1 c a) where+    genericToBSON (M1 x) = genericToBSON x++-- | Constructor tag+instance (GenericToBSON a, Constructor c) => GenericToBSON (M1 C c a) where+    genericToBSON c@(M1 x) = genericToBSON x ++ [ u "_constructor" =: u (conName c)]++-- | Selector tag+instance (Val a, Selector s) => GenericToBSON (M1 S s (K1 i a)) where+    genericToBSON s@(M1 (K1 x)) = [u (selName s) =: x]++-- | Constants+instance (ToBSON a) => GenericToBSON (K1 i a) where+    genericToBSON (K1 x) = toBSON x++------------------------------------------------------------------------------++------------------------------------------------------------------------------++class FromBSON a where+    fromBSON :: Document -> Maybe a++    default fromBSON :: (Generic a, GenericFromBSON (Rep a)) => Document -> Maybe a+    fromBSON doc = maybe Nothing (Just . to) (genericFromBSON doc)++class GenericFromBSON f where+    genericFromBSON :: Document -> Maybe (f a)++instance GenericFromBSON U1 where+    genericFromBSON doc = Just U1++instance (GenericFromBSON a, GenericFromBSON b) => GenericFromBSON (a :*: b) where+    genericFromBSON doc = do+        x <- (genericFromBSON doc)+        y <- (genericFromBSON doc)+        return (x :*: y)++instance (GenericFromBSON a, GenericFromBSON b) => GenericFromBSON (a :+: b) where+    genericFromBSON doc = left `mplus` right+        where left  = maybe Nothing (Just . L1) (genericFromBSON doc)+              right = maybe Nothing (Just . R1) (genericFromBSON doc)++instance (GenericFromBSON a, Constructor c) => GenericFromBSON (M1 C c a) where+    genericFromBSON doc = do+        cname <- BSON.lookup (u "_constructor") doc+        if (cname == (conName (undefined :: M1 C c a r)))+           then maybe Nothing (Just . M1) (genericFromBSON doc)+           else Nothing++instance (GenericFromBSON a) => GenericFromBSON (M1 D c a) where+    genericFromBSON doc = genericFromBSON doc >>= return . M1++instance (Val a, Selector s) => GenericFromBSON (M1 S s (K1 i a)) where+    genericFromBSON doc = (BSON.lookup sname doc) >>= return . M1 . K1+        where sname = u . selName $ (undefined :: M1 S s (K1 i a) r)++------------------------------------------------------------------------------++{-+data Test0 = A | B | C deriving (Generic, Typeable, Show, Eq)+instance ToBSON Test0+instance FromBSON Test0+-- (fromBSON $ toBSON A) :: Maybe Test0++data Test1 = Test1 String String deriving (Generic, Typeable, Show, Eq)+instance ToBSON Test1+instance FromBSON Test1+-- (fromBSON $ toBSON $ Test1 "aa" "bb") :: Maybe Test1++data Test2 = Test2 { test20 :: String, test21 :: String } deriving (Generic, Typeable, Show, Eq)+instance ToBSON Test2+instance FromBSON Test2+-- (fromBSON $ toBSON $ Test2 "aa" "bb") :: Maybe Test2++data Test3 = Test3 { test30 :: Test2, test31 :: String } deriving (Generic, Typeable, Show, Eq)+instance ToBSON Test3+instance FromBSON Test3+-- (fromBSON $ toBSON $ Test3 (Test2 "aa" "bb") "cc") :: Maybe Test3+-}