mirror of
https://github.com/github/semantic.git
synced 2024-11-24 08:54:07 +03:00
48 lines
2.3 KiB
Haskell
48 lines
2.3 KiB
Haskell
module ArbitraryTerm where
|
|
|
|
import Categorizable
|
|
import Syntax
|
|
import Term
|
|
import Control.Comonad.Cofree
|
|
import Control.Monad
|
|
import qualified OrderedMap as Map
|
|
import qualified Data.List as List
|
|
import qualified Data.Set as Set
|
|
import GHC.Generics
|
|
import Test.QuickCheck hiding (Fixed)
|
|
|
|
newtype ArbitraryTerm a annotation = ArbitraryTerm (annotation, Syntax a (ArbitraryTerm a annotation))
|
|
deriving (Show, Eq, Generic)
|
|
|
|
unTerm :: ArbitraryTerm a annotation -> Term a annotation
|
|
unTerm = unfold unpack
|
|
where unpack (ArbitraryTerm (annotation, syntax)) = (annotation, syntax)
|
|
|
|
instance (Eq a, Eq annotation, Arbitrary a, Arbitrary annotation) => Arbitrary (ArbitraryTerm a annotation) where
|
|
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
|
|
where boundedTerm maxLength maxDepth = ArbitraryTerm <$> ((,) <$> arbitrary <*> boundedSyntax maxLength maxDepth)
|
|
boundedSyntax _ maxDepth | maxDepth <= 0 = liftM Leaf arbitrary
|
|
boundedSyntax maxLength maxDepth = frequency
|
|
[ (12, liftM Leaf arbitrary),
|
|
(1, liftM Indexed $ take maxLength <$> listOf (smallerTerm maxLength maxDepth)),
|
|
(1, liftM Fixed $ take maxLength <$> listOf (smallerTerm maxLength maxDepth)),
|
|
(1, liftM (Keyed . Map.fromList) $ take maxLength <$> listOf (arbitrary >>= (\x -> (,) x <$> smallerTerm maxLength maxDepth))) ]
|
|
smallerTerm maxLength maxDepth = boundedTerm (div maxLength 3) (div maxDepth 3)
|
|
shrink term@(ArbitraryTerm (annotation, syntax)) = (++) (subterms term) $ filter (/= term) $
|
|
ArbitraryTerm <$> ((,) <$> shrink annotation <*> case syntax of
|
|
Leaf a -> Leaf <$> shrink a
|
|
Indexed i -> Indexed <$> (List.subsequences i >>= recursivelyShrink)
|
|
Fixed f -> Fixed <$> (List.subsequences f >>= recursivelyShrink)
|
|
Keyed k -> Keyed . Map.fromList <$> (List.subsequences (Map.toList k) >>= recursivelyShrink))
|
|
|
|
data CategorySet = A | B | C | D deriving (Eq, Show)
|
|
|
|
instance Categorizable CategorySet where
|
|
categories A = Set.fromList [ "a" ]
|
|
categories B = Set.fromList [ "b" ]
|
|
categories C = Set.fromList [ "c" ]
|
|
categories D = Set.fromList [ "d" ]
|
|
|
|
instance Arbitrary CategorySet where
|
|
arbitrary = elements [ A, B, C, D ]
|