never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
    2 
    3 module Conjure.Language.Expression.Op.ToMSet 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 OpToMSet x = OpToMSet x
   15     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   16 
   17 instance Serialize x => Serialize (OpToMSet x)
   18 instance Hashable  x => Hashable  (OpToMSet x)
   19 instance ToJSON    x => ToJSON    (OpToMSet x) where toJSON = genericToJSON jsonOptions
   20 instance FromJSON  x => FromJSON  (OpToMSet x) where parseJSON = genericParseJSON jsonOptions
   21 
   22 instance (TypeOf x, Pretty x) => TypeOf (OpToMSet x) where
   23     typeOf p@(OpToMSet x) = do
   24         tx <- typeOf x
   25         case tx of
   26             TypeRelation is  -> return (TypeMSet (TypeTuple is))
   27             TypeSet i        -> return (TypeMSet i)
   28             TypeFunction i j -> return (TypeMSet (TypeTuple [i,j]))
   29             TypeList i       -> return (TypeMSet i)
   30             _ -> raiseTypeError $ vcat [ pretty p
   31                                        , "The argument has type:" <+> pretty tx
   32                                        ]
   33 
   34 instance SimplifyOp OpToMSet x where
   35     simplifyOp _ = na "simplifyOp{OpToMSet}"
   36 
   37 instance Pretty x => Pretty (OpToMSet x) where
   38     prettyPrec _ (OpToMSet a) = "toMSet" <> prParens (pretty a)
   39 
   40 instance VarSymBreakingDescription x => VarSymBreakingDescription (OpToMSet x) where
   41     varSymBreakingDescription (OpToMSet a) = JSON.Object $ KM.fromList
   42         [ ("type", JSON.String "OpToMSet")
   43         , ("children", JSON.Array $ V.fromList
   44             [ varSymBreakingDescription a
   45             ])
   46         ]