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49 lines
2.3 KiB
Haskell
49 lines
2.3 KiB
Haskell
module ArbitraryTerm where
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import Category
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import Syntax
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import Term
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import Control.Comonad.Cofree
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import Control.Monad
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import qualified Data.OrderedMap as Map
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import qualified Data.List as List
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import qualified Data.Set as Set
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import GHC.Generics
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import Test.QuickCheck hiding (Fixed)
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import Data.Text.Arbitrary ()
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newtype ArbitraryTerm a annotation = ArbitraryTerm (annotation, Syntax a (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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instance (Eq a, Eq annotation, Arbitrary a, Arbitrary annotation) => Arbitrary (ArbitraryTerm a annotation) where
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arbitrary = 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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boundedSyntax _ maxDepth | maxDepth <= 0 = liftM Leaf arbitrary
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boundedSyntax maxLength maxDepth = frequency
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[ (12, liftM Leaf arbitrary),
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(1, liftM Indexed $ take maxLength <$> listOf (smallerTerm maxLength maxDepth)),
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(1, liftM Fixed $ take maxLength <$> listOf (smallerTerm maxLength maxDepth)),
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(1, liftM (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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Leaf a -> Leaf <$> shrink a
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Indexed i -> Indexed <$> (List.subsequences i >>= recursivelyShrink)
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Fixed f -> Fixed <$> (List.subsequences f >>= recursivelyShrink)
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Keyed k -> Keyed . Map.fromList <$> (List.subsequences (Map.toList k) >>= recursivelyShrink))
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data CategorySet = A | B | C | D deriving (Eq, Show)
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instance Categorizable CategorySet where
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categories A = Set.fromList [ Other "a" ]
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categories B = Set.fromList [ Other "b" ]
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categories C = Set.fromList [ Other "c" ]
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categories D = Set.fromList [ Other "d" ]
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instance Arbitrary CategorySet where
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arbitrary = elements [ A, B, C, D ]
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