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{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE CPP #-}
module Foundation.Check.Arbitrary
( Arbitrary(..)
, frequency
, oneof
, elements
, between
) where
import Basement.Imports
import Foundation.Primitive
import Basement.Nat
import Basement.Cast (cast)
import Basement.IntegralConv
import Basement.Bounded
import Basement.Types.OffsetSize
import qualified Basement.Types.Char7 as Char7
import Basement.Types.Word128 (Word128(..))
import Basement.Types.Word256 (Word256(..))
#if __GLASGOW_HASKELL__ >= 710
import qualified Basement.Sized.List as ListN
#endif
import Foundation.Check.Gen
import Foundation.Random
import Foundation.Bits
import Foundation.Collection
import Foundation.Numerical
import Control.Monad (replicateM)
-- | How to generate an arbitrary value for 'a'
class Arbitrary a where
arbitrary :: Gen a
instance Arbitrary Integer where
arbitrary = arbitraryInteger
instance Arbitrary Natural where
arbitrary = arbitraryNatural
instance (NatWithinBound Word64 n, KnownNat n) => Arbitrary (Zn64 n) where
arbitrary = zn64 <$> arbitrary
instance KnownNat n => Arbitrary (Zn n) where
arbitrary = zn <$> arbitraryNatural
-- prim types
instance Arbitrary Int where
arbitrary = int64ToInt <$> arbitraryInt64
instance Arbitrary Word where
arbitrary = word64ToWord <$> arbitraryWord64
instance Arbitrary Word256 where
arbitrary = Word256 <$> arbitraryWord64 <*> arbitraryWord64 <*> arbitraryWord64 <*> arbitraryWord64
instance Arbitrary Word128 where
arbitrary = Word128 <$> arbitraryWord64 <*> arbitraryWord64
instance Arbitrary Word64 where
arbitrary = arbitraryWord64
instance Arbitrary Word32 where
arbitrary = integralDownsize <$> arbitraryWord64
instance Arbitrary Word16 where
arbitrary = integralDownsize <$> arbitraryWord64
instance Arbitrary Word8 where
arbitrary = integralDownsize <$> arbitraryWord64
instance Arbitrary Int64 where
arbitrary = arbitraryInt64
instance Arbitrary Int32 where
arbitrary = integralDownsize <$> arbitraryInt64
instance Arbitrary Int16 where
arbitrary = integralDownsize <$> arbitraryInt64
instance Arbitrary Int8 where
arbitrary = integralDownsize <$> arbitraryInt64
instance Arbitrary Char where
arbitrary = arbitraryChar
instance Arbitrary Char7 where
arbitrary = Char7.fromByteMask . integralDownsize <$> arbitraryWord64
instance Arbitrary (CountOf ty) where
arbitrary = CountOf <$> arbitrary
instance Arbitrary Bool where
arbitrary = flip testBit 0 <$> arbitraryWord64
instance Arbitrary String where
arbitrary = genWithParams $ \params ->
fromList <$> (genMax (genMaxSizeString params) >>= \i -> replicateM (cast i) arbitrary)
instance Arbitrary AsciiString where
arbitrary = genWithParams $ \params ->
fromList <$> (genMax (genMaxSizeString params) >>= \i -> replicateM (cast i) arbitrary)
instance Arbitrary Float where
arbitrary = arbitraryF32
instance Arbitrary Double where
arbitrary = arbitraryF64
instance Arbitrary a => Arbitrary (Maybe a) where
arbitrary = frequency $ nonEmpty_ [ (1, pure Nothing), (4, Just <$> arbitrary) ]
instance (Arbitrary l, Arbitrary r) => Arbitrary (Either l r) where
arbitrary = oneof $ nonEmpty_ [ Left <$> arbitrary, Right <$> arbitrary ]
instance (Arbitrary a, Arbitrary b)
=> Arbitrary (a,b) where
arbitrary = (,) <$> arbitrary <*> arbitrary
instance (Arbitrary a, Arbitrary b, Arbitrary c)
=> Arbitrary (a,b,c) where
arbitrary = (,,) <$> arbitrary <*> arbitrary <*> arbitrary
instance (Arbitrary a, Arbitrary b, Arbitrary c, Arbitrary d)
=> Arbitrary (a,b,c,d) where
arbitrary = (,,,) <$> arbitrary <*> arbitrary <*> arbitrary <*> arbitrary
instance (Arbitrary a, Arbitrary b, Arbitrary c, Arbitrary d, Arbitrary e)
=> Arbitrary (a,b,c,d,e) where
arbitrary = (,,,,) <$> arbitrary <*> arbitrary <*> arbitrary <*> arbitrary <*> arbitrary
instance (Arbitrary a, Arbitrary b, Arbitrary c, Arbitrary d, Arbitrary e, Arbitrary f)
=> Arbitrary (a,b,c,d,e,f) where
arbitrary = (,,,,,) <$> arbitrary <*> arbitrary <*> arbitrary <*> arbitrary <*> arbitrary <*> arbitrary
instance Arbitrary a => Arbitrary [a] where
arbitrary = genWithParams $ \params ->
fromList <$> (genMax (genMaxSizeArray params) >>= \i -> replicateM (cast i) arbitrary)
#if __GLASGOW_HASKELL__ >= 710
instance (Arbitrary a, KnownNat n, NatWithinBound Int n) => Arbitrary (ListN.ListN n a) where
arbitrary = ListN.replicateM arbitrary
#endif
arbitraryInteger :: Gen Integer
arbitraryInteger =
-- TODO use the sized parameter
frequency $ nonEmpty_
[ (4, integerOfSize True 2)
, (4, integerOfSize False 2)
, (4, integerOfSize True 4)
, (4, integerOfSize False 4)
, (2, integerOfSize True 8)
, (2, integerOfSize False 8)
, (1, integerOfSize True 16)
, (1, integerOfSize False 16)
]
where
integerOfSize :: Bool -> Word -> Gen Integer
integerOfSize toSign n = ((if toSign then negate else id) . foldl' (\x y -> x + integralUpsize y) 0 . toList)
<$> (arbitraryUArrayOf n :: Gen (UArray Word8))
arbitraryNatural :: Gen Natural
arbitraryNatural = integralDownsize . abs <$> arbitraryInteger
arbitraryChar :: Gen Char
arbitraryChar = frequency $ nonEmpty_
[ (6, wordToChar <$> genMax 128)
, (1, wordToChar <$> genMax 0x10ffff)
]
arbitraryWord64 :: Gen Word64
arbitraryWord64 = genWithRng getRandomWord64
arbitraryInt64 :: Gen Int64
arbitraryInt64 = cast <$> arbitraryWord64
arbitraryF64 :: Gen Double
arbitraryF64 = genWithRng getRandomF64
arbitraryF32 :: Gen Float
arbitraryF32 = genWithRng getRandomF32
arbitraryUArrayOf :: (PrimType ty, Arbitrary ty) => Word -> Gen (UArray ty)
arbitraryUArrayOf size = between (0, size) >>=
\sz -> fromList <$> replicateM (cast sz) arbitrary
-- | Call one of the generator weighted
frequency :: NonEmpty [(Word, Gen a)] -> Gen a
frequency (getNonEmpty -> l) = between (0, sum) >>= pickOne l
where
sum :: Word
!sum = foldl' (+) 0 $ fmap fst l
pickOne ((k,x):xs) n
| n <= k = x
| otherwise = pickOne xs (n-k)
pickOne _ _ = error "frequency"
oneof :: NonEmpty [Gen a] -> Gen a
oneof ne = frequency (nonEmptyFmap (\x -> (1, x)) ne)
elements :: NonEmpty [a] -> Gen a
elements l = frequency (nonEmptyFmap (\x -> (1, pure x)) l)
between :: (Word, Word) -> Gen Word
between (x,y)
| range == 0 = pure x
| otherwise = (+) x <$> genMax range
where range = y - x
genMax :: Word -> Gen Word
genMax m = flip mod m <$> arbitrary
|
