never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
    2 
    3 module Conjure.Language.Expression.Op.PowerSet where
    4 
    5 import Conjure.Prelude
    6 import Conjure.Language.Expression.Op.Internal.Common
    7 
    8 import qualified Data.Aeson as JSON             -- aeson
    9 import qualified Data.Aeson.KeyMap as KM
   10 
   11 import qualified Data.Vector as V               -- vector
   12 
   13 
   14 data OpPowerSet x = OpPowerSet x
   15     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   16 
   17 instance Serialize x => Serialize (OpPowerSet x)
   18 instance Hashable  x => Hashable  (OpPowerSet x)
   19 instance ToJSON    x => ToJSON    (OpPowerSet x) where toJSON = genericToJSON jsonOptions
   20 instance FromJSON  x => FromJSON  (OpPowerSet x) where parseJSON = genericParseJSON jsonOptions
   21 instance (TypeOf x, Pretty x) => TypeOf (OpPowerSet x) where
   22     typeOf p@(OpPowerSet x) = do
   23         tx <- typeOf x
   24         case tx of
   25             TypeSet i -> return (TypeSet (TypeSet i))
   26             _ -> raiseTypeError p
   27 
   28 instance SimplifyOp OpPowerSet x where
   29     simplifyOp _ = na "simplifyOp{OpPowerSet}"
   30 
   31 instance Pretty x => Pretty (OpPowerSet x) where
   32     prettyPrec _ (OpPowerSet a) = "powerSet" <> prParens (pretty a)
   33 
   34 instance VarSymBreakingDescription x => VarSymBreakingDescription (OpPowerSet x) where
   35     varSymBreakingDescription (OpPowerSet a) = JSON.Object $ KM.fromList
   36         [ ("type", JSON.String "OpPowerSet")
   37         , ("children", JSON.Array $ V.fromList
   38             [ varSymBreakingDescription a
   39             ])
   40         ]