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Represent ArbitraryDiff as a datatype.

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This commit is contained in:
Rob Rix 2016-06-30 14:19:22 -04:00
parent 5b70ff7635
commit 0770a410d4
1 changed files with 8 additions and 5 deletions
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13
src/Diff/Arbitrary.hs
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@ -13,21 +13,24 @@ import Prologue
import Term.Arbitrary
import Test.QuickCheck hiding (Fixed)
newtype ArbitraryDiff leaf annotation = ArbitraryDiff (FreeF (CofreeF (Syntax leaf) (Join (,) annotation)) (Patch (ArbitraryTerm leaf annotation)) (ArbitraryDiff leaf annotation))
data ArbitraryDiff leaf annotation
= ArbitraryFree (Join (,) annotation) (Syntax leaf (ArbitraryDiff leaf annotation))
| ArbitraryPure (Patch (ArbitraryTerm leaf annotation))
deriving (Show, Eq, Generic)
unArbitraryDiff :: ArbitraryDiff leaf annotation -> FreeF (CofreeF (Syntax leaf) (Join (,) annotation)) (Patch (ArbitraryTerm leaf annotation)) (ArbitraryDiff leaf annotation)
unArbitraryDiff (ArbitraryDiff a) = a
unArbitraryDiff (ArbitraryFree a s) = Free (a :< s)
unArbitraryDiff (ArbitraryPure p) = Pure p
toDiff :: ArbitraryDiff leaf annotation -> Diff leaf annotation
toDiff = fmap (fmap toTerm) . unfold unArbitraryDiff
diffOfSize :: (Arbitrary leaf, Arbitrary annotation) => Int -> Gen (ArbitraryDiff leaf annotation)
diffOfSize n
| n <= 0 = (ArbitraryDiff .) . (Free .) . (:<) <$> arbitrary <*> syntaxOfSize diffOfSize n
| n <= 0 = ArbitraryFree <$> arbitrary <*> syntaxOfSize diffOfSize n
| otherwise = oneof
[ (ArbitraryDiff .) . (Free .) . (:<) <$> arbitrary <*> syntaxOfSize diffOfSize n
, ArbitraryDiff . Pure <$> patchOfSize n ]
[ ArbitraryFree <$> arbitrary <*> syntaxOfSize diffOfSize n
, ArbitraryPure <$> patchOfSize n ]
where patchOfSize 1 = oneof [ Insert <$> termOfSize 1
, Delete <$> termOfSize 1 ]
patchOfSize n = do