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ArbitraryTerm wraps CofreeF.
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@ -20,16 +20,16 @@ import Syntax
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import Term
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import Test.QuickCheck hiding (Fixed)
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newtype ArbitraryTerm a annotation = ArbitraryTerm (annotation, Syntax a (ArbitraryTerm a annotation))
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newtype ArbitraryTerm a annotation = ArbitraryTerm (CofreeF (Syntax a) annotation (ArbitraryTerm a annotation))
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deriving (Show, Eq, Generic)
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unTerm :: ArbitraryTerm a annotation -> Term a annotation
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unTerm = unfold unpack
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where unpack (ArbitraryTerm (annotation, syntax)) = annotation :< syntax
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where unpack (ArbitraryTerm (annotation :< syntax)) = annotation :< syntax
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instance (Eq a, Eq annotation, Arbitrary a, Arbitrary annotation) => Arbitrary (ArbitraryTerm a annotation) where
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arbitrary = scale (`div` 2) $ sized (\ x -> boundedTerm x x) -- first indicates the cube of the max length of lists, second indicates the cube of the max depth of the tree
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where boundedTerm maxLength maxDepth = ArbitraryTerm <$> ((,) <$> arbitrary <*> boundedSyntax maxLength maxDepth)
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where boundedTerm maxLength maxDepth = ArbitraryTerm <$> ((:<) <$> arbitrary <*> boundedSyntax maxLength maxDepth)
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boundedSyntax _ maxDepth | maxDepth <= 0 = Leaf <$> arbitrary
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boundedSyntax maxLength maxDepth = frequency
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[ (12, Leaf <$> arbitrary),
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@ -37,8 +37,8 @@ instance (Eq a, Eq annotation, Arbitrary a, Arbitrary annotation) => Arbitrary (
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(1, Fixed . take maxLength <$> listOf (smallerTerm maxLength maxDepth)),
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(1, Keyed . Map.fromList . take maxLength <$> listOf (arbitrary >>= (\x -> (,) x <$> smallerTerm maxLength maxDepth))) ]
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smallerTerm maxLength maxDepth = boundedTerm (div maxLength 3) (div maxDepth 3)
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shrink term@(ArbitraryTerm (annotation, syntax)) = (subterms term ++) $ filter (/= term) $
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ArbitraryTerm <$> ((,) <$> shrink annotation <*> case syntax of
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shrink term@(ArbitraryTerm (annotation :< syntax)) = (subterms term ++) $ filter (/= term) $
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ArbitraryTerm <$> ((:<) <$> shrink annotation <*> case syntax of
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Leaf a -> Leaf <$> shrink a
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Indexed i -> Indexed <$> (List.subsequences i >>= recursivelyShrink)
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Fixed f -> Fixed <$> (List.subsequences f >>= recursivelyShrink)
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