diff --git a/Data/Convert.hs b/Data/Convert.hs new file mode 100644 --- /dev/null +++ b/Data/Convert.hs @@ -0,0 +1,5 @@ + +module Data.Convert (module X) where + +import Data.Convert.Base as X +import Data.Convert.Instances () diff --git a/Data/Convert/Base.hs b/Data/Convert/Base.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Base.hs @@ -0,0 +1,69 @@ +{-# LANGUAGE FunctionalDependencies #-} +{-# LANGUAGE ConstraintKinds #-} +{-# LANGUAGE PolyKinds #-} +{-# LANGUAGE RankNTypes #-} + +{-# LANGUAGE CPP #-} +#if __GLASGOW_HASKELL__ < 710 +{-# LANGUAGE OverlappingInstances #-} +#endif + +module Data.Convert.Base where + +import Control.Lens + +---------------------------------------------------------------------- +-- Conversions +---------------------------------------------------------------------- + +class MaybeConvertible a e b | a b -> e where + tryConvert :: a -> Either e b + +class MaybeConvertible' a e b | b -> a e where + tryConvert' :: a -> Either e b + +class Convertible a b where + convert :: a -> b + +-- Maybe we should change the name to Specializable and specialize? +class Convertible' a b | b -> a where + convert' :: a -> b + +class Castable a b where + cast :: a -> b + +type IsoMaybeConvertible a e b = (MaybeConvertible a e b, MaybeConvertible b e a) +type IsoMaybeConvertible' a e b = (MaybeConvertible' a e b, MaybeConvertible' b e a) +type IsoConvertible a b = (Convertible a b , Convertible b a ) +type IsoConvertible' a b = (Convertible' a b , Convertible' b a ) +type IsoCastable a b = (Castable a b , Castable b a ) + +class ConvertibleM m n where convertM :: m (t1 :: k) -> n (t1 :: k) +class ConvertibleM2 m n where convertM2 :: m (t1 :: k) (t2 :: k) -> n (t1 :: k) (t2 :: k) +class ConvertibleM3 m n where convertM3 :: m (t1 :: k) (t2 :: k) (t3 :: k) -> n (t1 :: k) (t2 :: k) (t3 :: k) +class ConvertibleM4 m n where convertM4 :: m (t1 :: k) (t2 :: k) (t3 :: k) (t4 :: k) -> n (t1 :: k) (t2 :: k) (t3 :: k) (t4 :: k) +class ConvertibleM5 m n where convertM5 :: m (t1 :: k) (t2 :: k) (t3 :: k) (t4 :: k) (t5 :: k) -> n (t1 :: k) (t2 :: k) (t3 :: k) (t4 :: k) (t5 :: k) + +-- utils + +unsafeConvert :: Show e => MaybeConvertible a e b => a -> b +unsafeConvert a = + case tryConvert a of + Left e -> error $ show e + Right r -> r + +casted :: IsoCastable a b => Iso' a b +casted = iso cast cast + +converted :: IsoConvertible a b => Iso' a b +converted = iso convert convert + +-- instances + +instance {-# OVERLAPPABLE #-} Convertible a a where convert = id + +instance {-# OVERLAPPABLE #-} Convertible a b => Convertible (Maybe a) (Maybe b) where + convert = fmap convert + +instance {-# OVERLAPPABLE #-} Convertible a b => Castable a b where + cast = convert diff --git a/Data/Convert/Bound.hs b/Data/Convert/Bound.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Bound.hs @@ -0,0 +1,165 @@ +{-# LANGUAGE FlexibleContexts #-} +{-# LANGUAGE NoMonomorphismRestriction #-} +{-# LANGUAGE TemplateHaskell #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE TemplateHaskell #-} +{-# LANGUAGE DeriveFunctor #-} +{-# LANGUAGE UndecidableInstances #-} +{-# LANGUAGE LambdaCase #-} +{-# LANGUAGE TypeFamilies #-} +{-# LANGUAGE ScopedTypeVariables #-} +{-# LANGUAGE ViewPatterns #-} + +module Data.Convert.Bound where + +import Data.Convert.Base +import Data.Typeable +import Control.Applicative +import Language.Haskell.TH hiding (Type, Safety, Safe, Unsafe) +import Data.Monoid +import GHC.TypeLits +import Prelude hiding (Bounded, maxBound, minBound) +import qualified Prelude as Prelude + + + + +-- === The runtime used safe conversion === + +-- TODO [wd]: We can optimize it further. Right now we are converting everything to Rational and comparing. +-- It's because sometimes we are converting between types of different bounds like Char and Int8 +-- - neither can we safely convert Char to Int 8 nor vice versa. +-- We can though make typeclasses that will find the smallest super-type for a given type pair +-- and convert both values to that super-type +boundedConversion :: (Bounded b, Ord a, Convertible a Rational, Convertible (Bounds b) (Bounds Rational)) + => (a -> b) -> (a -> Either BoundError b) +boundedConversion (func :: a -> b) inp = if (convert inp) `boundedBy` (convert (bounds :: Bounds b) :: Bounds Rational) + then Right $ func inp + else Left BoundError + + + + +-- === Errors === + +data BoundError = BoundError deriving (Show) + + +-- === Conversion === + +data Conversion = Conversion (Q Exp) Type Type + +class Conversions a b where + conversions :: Q Exp -> a -> b -> [Conversion] + +-- utils + +genConversion :: Conversion -> Q Dec +genConversion c@(Conversion qexp (Type name bounds) (Type name' bounds')) = do + exp <- qexp :: Q Exp + let convf name fmod = [ValD (VarP $ mkName name) (NormalB $ fmod exp) []] + return $ if bounds `isSubBound` bounds' + then InstanceD [] (AppT (AppT (ConT $ mkName "Convertible") (ConT name)) (ConT name')) $ convf "convert" id + else InstanceD [] (AppT (AppT (AppT (ConT $ mkName "MaybeConvertible") (ConT name)) (ConT $ mkName "BoundError")) (ConT name')) $ convf "tryConvert" $ AppE (VarE $ mkName "boundedConversion") + + +genConversions :: [Conversion] -> Q [Dec] +genConversions = mapM genConversion + +-- instances + +instance Conversions [Type] [Type] where conversions f a b = Conversion f <$> a <*> b +instance Conversions Type [Type] where conversions f a b = Conversion f a <$> b +instance Conversions [Type] Type where conversions f a b = flip (Conversion f) b <$> a +instance Conversions Type Type where conversions f a b = [Conversion f a b] + +instance Show Conversion where + show (Conversion _ a b) = "Conversion " -- <> " " <> name a <> " " <> name b + + + + +-- === Type === + +data Type = Type { name :: Name + , tbounds :: (Bounds Integer) + } deriving (Show, Eq) + + + +-- === Layout === +data Layout = IntLayout Sign Integer + | InfiniteLayout + deriving (Show, Eq) + +data Sign = Signed + | Unsigned + deriving (Show, Eq) + +layoutBounds :: Layout -> Bounds Integer +layoutBounds = \case + InfiniteLayout -> infiniteBounds + IntLayout s i -> Bounds (Value (- base)) (Value $ base - 1) + where base = case s of + Signed -> 2 ^ (i - 1) + Unsigned -> 2 ^ i + + + +-- === Value === + +data Value a = MinusInfinity + | Value a + | Infinity + deriving (Show, Functor, Eq) + +-- instances + +instance Num a => Num (Value a) where + fromInteger = Value . fromInteger + +instance Convertible a b => Convertible (Value a) (Value b) where + convert (Value a) = Value $ convert a + +instance Ord a => Ord (Value a) where + compare MinusInfinity MinusInfinity = EQ + compare MinusInfinity a = LT + compare a MinusInfinity = GT + compare Infinity Infinity = EQ + compare Infinity a = GT + compare a Infinity = LT + compare (Value a) (Value a') = compare a a' + + + + +-- === Bounds === + +data Bounds a = Bounds (Value a) (Value a) deriving (Show, Functor, Eq) + +class Bounded a where + bounds :: Bounds a + +-- utils + +infiniteBounds :: Bounds a +infiniteBounds = Bounds MinusInfinity Infinity + +isSubBound :: Ord a => Bounds a -> Bounds a -> Bool +isSubBound (Bounds min max) (Bounds min' max') = min >= min' && max <= max' + +boundedBy :: Ord a => a -> Bounds a -> Bool +boundedBy (Value -> a) (Bounds min max) = a >= min && a <= max + +-- instances +instance {-# OVERLAPPABLE #-} Convertible a b => Convertible (Bounds a) (Bounds b) where + convert (Bounds a b) = Bounds (convert a) (convert b) + +instance {-# OVERLAPPABLE #-} (Prelude.Bounded a) + => Bounded a where + bounds = Bounds (Value Prelude.minBound) (Value Prelude.maxBound) + +instance {-# OVERLAPPABLE #-} Bounded Float where bounds = infiniteBounds +instance {-# OVERLAPPABLE #-} Bounded Double where bounds = infiniteBounds +instance {-# OVERLAPPABLE #-} Bounded Rational where bounds = infiniteBounds +instance {-# OVERLAPPABLE #-} Bounded Integer where bounds = infiniteBounds diff --git a/Data/Convert/Errors.hs b/Data/Convert/Errors.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Errors.hs @@ -0,0 +1,5 @@ +module Data.Convert.Errors where + +import Data.Typeable + +data TypeMismatch = TypeMismatch TypeRep TypeRep deriving (Show) diff --git a/Data/Convert/Instances.hs b/Data/Convert/Instances.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Instances.hs @@ -0,0 +1,6 @@ +module Data.Convert.Instances () where + +import Data.Convert.Instances.Map () +import Data.Convert.Instances.Num () +import Data.Convert.Instances.Text () +import Data.Convert.Instances.TH () diff --git a/Data/Convert/Instances/Map.hs b/Data/Convert/Instances/Map.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Instances/Map.hs @@ -0,0 +1,13 @@ +module Data.Convert.Instances.Map() +where + +import Data.Convert.Base + +import qualified Data.Map as Map + + +instance Ord k => Convertible [(k, a)] (Map.Map k a) where + convert = Map.fromList + +instance Convertible (Map.Map k a) [(k, a)] where + convert = Map.toList diff --git a/Data/Convert/Instances/Num.hs b/Data/Convert/Instances/Num.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Instances/Num.hs @@ -0,0 +1,66 @@ +{-# LANGUAGE NoMonomorphismRestriction #-} +{-# LANGUAGE FlexibleContexts #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE TemplateHaskell #-} + +module Data.Convert.Instances.Num where + +import Data.Convert.Bound +import Data.Convert.Base +import Data.Monoid +import qualified Data.ByteString as BS +import GHC.Int +import Data.Word +import Data.Bits (shiftR) + +intTypes = [ Type ''Int $ layoutBounds $ IntLayout Signed 30 -- according to: https://hackage.haskell.org/package/base-4.8.0.0/docs/Data-Int.html#t:Int + , Type ''Integer $ layoutBounds $ InfiniteLayout + , Type ''Int8 $ layoutBounds $ IntLayout Signed 8 + , Type ''Int16 $ layoutBounds $ IntLayout Signed 16 + , Type ''Int32 $ layoutBounds $ IntLayout Signed 32 + , Type ''Int64 $ layoutBounds $ IntLayout Signed 64 + ] + +wordTypes = [ Type ''Word $ layoutBounds $ IntLayout Signed 30 -- according to: https://hackage.haskell.org/package/base-4.8.0.0/docs/Data-Int.html#t:Int + , Type ''Word8 $ layoutBounds $ IntLayout Signed 8 + , Type ''Word16 $ layoutBounds $ IntLayout Signed 16 + , Type ''Word32 $ layoutBounds $ IntLayout Signed 32 + , Type ''Word64 $ layoutBounds $ IntLayout Signed 64 + ] + +floatTypes = [ Type ''Float $ layoutBounds $ InfiniteLayout + , Type ''Double $ layoutBounds $ InfiniteLayout + , Type ''Rational $ layoutBounds $ InfiniteLayout + ] + +charType = Type ''Char $ Bounds 0 1114111 -- max char enum is 1114111 + +integralTypes = intTypes <> wordTypes + +------------- + +instance Convertible () [t] where convert _ = [] +instance Convertible (t,t) [t] where convert (t1,t2) = [t1,t2] +instance Convertible (t,t,t) [t] where convert (t1,t2,t3) = [t1,t2,t3] +instance Convertible (t,t,t,t) [t] where convert (t1,t2,t3,t4) = [t1,t2,t3,t4] +instance Convertible (t,t,t,t,t) [t] where convert (t1,t2,t3,t4,t5) = [t1,t2,t3,t4,t5] +instance Convertible (t,t,t,t,t,t) [t] where convert (t1,t2,t3,t4,t5,t6) = [t1,t2,t3,t4,t5,t6] +instance Convertible (t,t,t,t,t,t,t) [t] where convert (t1,t2,t3,t4,t5,t6,t7) = [t1,t2,t3,t4,t5,t6,t7] +instance Convertible (t,t,t,t,t,t,t,t) [t] where convert (t1,t2,t3,t4,t5,t6,t7,t8) = [t1,t2,t3,t4,t5,t6,t7,t8] +instance Convertible (t,t,t,t,t,t,t,t,t) [t] where convert (t1,t2,t3,t4,t5,t6,t7,t8,t9) = [t1,t2,t3,t4,t5,t6,t7,t8,t9] + + +-- TODO: http://stackoverflow.com/questions/8350814/converting-64-bit-double-to-bytestring-efficiently +instance Convertible Word64 (Word8,Word8,Word8,Word8,Word8,Word8,Word8,Word8) where + convert word = (unpack 56, unpack 48, unpack 40, unpack 32, unpack 24, unpack 16, unpack 8, unpack 0) + where unpack = fromIntegral . shiftR word + +-- ... + +-------------- + +numConversions = conversions [| fromIntegral |] integralTypes (integralTypes <> floatTypes) + <> conversions [| truncate |] floatTypes integralTypes + <> conversions [| realToFrac |] floatTypes floatTypes + <> conversions [| fromIntegral . fromEnum |] charType (integralTypes <> floatTypes) + <> conversions [| toEnum . fromIntegral |] integralTypes charType diff --git a/Data/Convert/Instances/TH.hs b/Data/Convert/Instances/TH.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Instances/TH.hs @@ -0,0 +1,10 @@ +{-# LANGUAGE TemplateHaskell #-} + +module Data.Convert.Instances.TH where + +import Data.Convert.Base +import Data.Convert.Bound +import Data.Convert.Instances.Num (numConversions) + + +genConversions numConversions diff --git a/Data/Convert/Instances/Text.hs b/Data/Convert/Instances/Text.hs new file mode 100644 --- /dev/null +++ b/Data/Convert/Instances/Text.hs @@ -0,0 +1,217 @@ +{-# LANGUAGE ExistentialQuantification #-} +{-# LANGUAGE MultiParamTypeClasses #-} +{-# LANGUAGE UndecidableInstances #-} +{-# LANGUAGE FlexibleInstances #-} +{-# LANGUAGE FlexibleContexts #-} +{-# LANGUAGE TypeSynonymInstances #-} +{-# LANGUAGE CPP #-} + + +module Data.Convert.Instances.Text() +where + +import Data.Convert.Base +import qualified Data.Text as TS +import qualified Data.Text.Encoding as TE +import qualified Data.Text.Lazy as TL +import qualified Data.Text.Lazy.Builder as TLB +import qualified Data.Text.Lazy.Encoding as TLE +import qualified Data.ByteString as BS +import qualified Data.ByteString.Lazy as BL +import qualified Data.ByteString.Builder as BB +import Data.Word (Word8) +import Data.Foldable + + + +instance Convertible TS.Text [Char] where + {-# INLINE convert #-} + convert = TS.unpack + +instance Convertible TS.Text TL.Text where + {-# INLINE convert #-} + convert = TL.fromStrict + +instance Convertible TS.Text TLB.Builder where + {-# INLINE convert #-} + convert = TLB.fromText + +instance Convertible TS.Text BS.ByteString where + {-# INLINE convert #-} + convert = TE.encodeUtf8 + +instance Convertible TS.Text BL.ByteString where + {-# INLINE convert #-} + convert = BL.fromStrict . TE.encodeUtf8 + +instance Convertible TS.Text BB.Builder where + {-# INLINE convert #-} +#if MIN_VERSION_text(1,2,0) + convert = TE.encodeUtf8Builder +#else + convert = convert . TE.encodeUtf8 +#endif + + + +instance Convertible TL.Text [Char] where + {-# INLINE convert #-} + convert = TL.unpack + +instance Convertible TL.Text TS.Text where + {-# INLINE convert #-} + convert = TL.toStrict + +instance Convertible TL.Text TLB.Builder where + {-# INLINE convert #-} + convert = TLB.fromLazyText + +instance Convertible TL.Text BS.ByteString where + {-# INLINE convert #-} + convert = convert . TLE.encodeUtf8 + +instance Convertible TL.Text BL.ByteString where + {-# INLINE convert #-} + convert = TLE.encodeUtf8 + +instance Convertible TL.Text BB.Builder where + {-# INLINE convert #-} +#if MIN_VERSION_text(1,2,0) + convert = TLE.encodeUtf8Builder +#else + convert = convert . TLE.encodeUtf8 +#endif + + + +instance Convertible TLB.Builder [Char] where + {-# INLINE convert #-} + convert = convert . TLB.toLazyText + +instance Convertible TLB.Builder TS.Text where + {-# INLINE convert #-} + convert = convert . TLB.toLazyText + +instance Convertible TLB.Builder TL.Text where + {-# INLINE convert #-} + convert = TLB.toLazyText + +instance Convertible TLB.Builder BS.ByteString where + {-# INLINE convert #-} + convert = convert . TLB.toLazyText + +instance Convertible TLB.Builder BL.ByteString where + {-# INLINE convert #-} + convert = convert . TLB.toLazyText + +instance Convertible TLB.Builder BB.Builder where + {-# INLINE convert #-} + convert = convert . TLB.toLazyText + + + +instance Convertible BS.ByteString [Word8] where + {-# INLINE convert #-} + convert = BS.unpack + +instance Convertible BS.ByteString TS.Text where + {-# INLINE convert #-} + convert = TE.decodeUtf8 + +instance Convertible BS.ByteString TL.Text where + {-# INLINE convert #-} + convert = TL.fromStrict . convert + +instance Convertible BS.ByteString TLB.Builder where + {-# INLINE convert #-} + convert = TLB.fromText . convert + +instance Convertible BS.ByteString BL.ByteString where + {-# INLINE convert #-} + convert = BL.fromStrict + +instance Convertible BS.ByteString BB.Builder where + {-# INLINE convert #-} + convert = BB.byteString + + + +instance Convertible BL.ByteString [Word8] where + {-# INLINE convert #-} + convert = BL.unpack + +instance Convertible BL.ByteString TS.Text where + {-# INLINE convert #-} + convert = TL.toStrict . convert + +instance Convertible BL.ByteString TL.Text where + {-# INLINE convert #-} + convert = TLE.decodeUtf8 + +instance Convertible BL.ByteString TLB.Builder where + {-# INLINE convert #-} + convert = TLB.fromLazyText . convert + +instance Convertible BL.ByteString BS.ByteString where + {-# INLINE convert #-} + convert = BL.toStrict + +instance Convertible BL.ByteString BB.Builder where + {-# INLINE convert #-} + convert = BB.lazyByteString + + + +instance Convertible [Char] TS.Text where + {-# INLINE convert #-} + convert = TS.pack + +instance Convertible [Char] TL.Text where + {-# INLINE convert #-} + convert = TL.pack + +instance Convertible [Char] TLB.Builder where + {-# INLINE convert #-} + convert = TLB.fromString + + + +instance Convertible [Word8] BS.ByteString where + {-# INLINE convert #-} + convert = BS.pack + +instance Convertible [Word8] BL.ByteString where + {-# INLINE convert #-} + convert = BL.pack + +instance Convertible [Word8] BB.Builder where + {-# INLINE convert #-} + convert = foldMap BB.word8 + + + +instance Convertible Char TS.Text where + {-# INLINE convert #-} + convert = TS.singleton + +instance Convertible Char TL.Text where + {-# INLINE convert #-} + convert = TL.singleton + +instance Convertible Char TLB.Builder where + {-# INLINE convert #-} + convert = TLB.singleton + + + +instance Convertible Word8 BS.ByteString where + {-# INLINE convert #-} + convert = BS.singleton + +instance Convertible Word8 BL.ByteString where + {-# INLINE convert #-} + convert = BL.singleton + +instance Convertible Word8 BB.Builder where + {-# INLINE convert #-} + convert = BB.word8 diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,202 @@ + + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/Setup.lhs b/Setup.lhs new file mode 100644 --- /dev/null +++ b/Setup.lhs @@ -0,0 +1,6 @@ +#!/usr/bin/env runhaskell + +> import Distribution.Simple + +> main = defaultMain + diff --git a/convert.cabal b/convert.cabal new file mode 100644 --- /dev/null +++ b/convert.cabal @@ -0,0 +1,56 @@ +name: convert +version: 1.0 +synopsis: Safe and unsafe data conversion utilities with strong type-level operation. checking. +-- description: +license: Apache-2.0 +license-file: LICENSE +author: Wojciech Danilo +maintainer: Wojciech Danilo +stability: experimental +homepage: https://github.com/wdanilo/convert +bug-reports: https://github.com/wdanilo/convert/issues +copyright: Copyright (C) 2015 Wojciech Danilo +category: Data +build-type: Simple +-- extra-source-files: +cabal-version: >=1.10 + + +flag dump-splices + default: False + manual: True + +library + Build-Depends: base>=3 && <5, + old-time, + time>=1.1.3, + bytestring >= 0.10.2, + containers, + old-locale, + mtl, + text >= 0.8, + either, + template-haskell, + lens + + GHC-Options: -O2 -Wall -fno-warn-orphans + default-language: Haskell2010 + + + + Exposed-Modules: Data.Convert, + Data.Convert.Base, + Data.Convert.Bound, + Data.Convert.Errors, + Data.Convert.Instances, + Data.Convert.Instances.Map, + Data.Convert.Instances.Num, + Data.Convert.Instances.Text, + Data.Convert.Instances.TH + + default-extensions: MultiParamTypeClasses, + UndecidableInstances, FlexibleInstances, + FlexibleContexts, CPP + + +