never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
    2 
    3 module Conjure.Language.Expression.Op.Slicing 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 OpSlicing x = OpSlicing x (Maybe x) (Maybe x)
   15     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   16 
   17 instance Serialize x => Serialize (OpSlicing x)
   18 instance Hashable  x => Hashable  (OpSlicing x)
   19 instance ToJSON    x => ToJSON    (OpSlicing x) where toJSON = genericToJSON jsonOptions
   20 instance FromJSON  x => FromJSON  (OpSlicing x) where parseJSON = genericParseJSON jsonOptions
   21 
   22 instance (TypeOf x, Pretty x) => TypeOf (OpSlicing x) where
   23     typeOf p@(OpSlicing m _ _) = do
   24         ty <- typeOf m
   25         case ty of
   26             TypeMatrix{} -> return ()
   27             TypeList{} -> return ()
   28             _ -> raiseTypeError p
   29         return ty
   30 
   31 instance SimplifyOp OpSlicing x where
   32     simplifyOp _ = na "simplifyOp{OpSlicing}"
   33 
   34 instance Pretty x => Pretty (OpSlicing x) where
   35     prettyPrec _ (OpSlicing m a b) = pretty m <> prBrackets (pretty a <> ".." <> pretty b)
   36 
   37 instance VarSymBreakingDescription x => VarSymBreakingDescription (OpSlicing x) where
   38     varSymBreakingDescription (OpSlicing a b c) = JSON.Object $ KM.fromList
   39         [ ("type", JSON.String "OpSlicing")
   40         , ("children", JSON.Array $ V.fromList
   41             [ varSymBreakingDescription a
   42             , maybe JSON.Null varSymBreakingDescription b
   43             , maybe JSON.Null varSymBreakingDescription c
   44             ])
   45         ]