never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable, ViewPatterns #-}
    2 
    3 module Conjure.Language.Expression.Op.Compose 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 import qualified Data.Vector as V               -- vector
   11 
   12 
   13 
   14 data OpCompose x = OpCompose x x
   15     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   16 
   17 instance Serialize x => Serialize (OpCompose x)
   18 instance Hashable  x => Hashable  (OpCompose x)
   19 instance ToJSON    x => ToJSON    (OpCompose x) where toJSON = genericToJSON jsonOptions
   20 instance FromJSON  x => FromJSON  (OpCompose x) where parseJSON = genericParseJSON jsonOptions
   21 
   22 instance (TypeOf x, Pretty x) => TypeOf (OpCompose x) where
   23     typeOf inp@(OpCompose p q) = do
   24         pTy <- typeOf p
   25         qTy <- typeOf q
   26         case (pTy, qTy) of
   27           (TypePermutation pTyInner, TypePermutation qTyInner) ->
   28               if typesUnify [pTyInner, qTyInner]
   29                     then return pTy
   30                     else raiseTypeError inp
   31           _ -> raiseTypeError inp
   32 
   33 instance SimplifyOp OpCompose x where
   34     simplifyOp _ = na "simplifyOp{OpCompose}"
   35 
   36 instance Pretty x => Pretty (OpCompose x) where
   37     prettyPrec _ (OpCompose a i) = "compose" <> prettyList prParens "," [a,i]
   38 
   39 
   40 instance VarSymBreakingDescription x => VarSymBreakingDescription (OpCompose x) where
   41     varSymBreakingDescription (OpCompose a i) = JSON.Object $ KM.fromList
   42         [ ("type", JSON.String "OpCompose")
   43         , ("children", JSON.Array $ V.fromList
   44             [ varSymBreakingDescription a
   45             , varSymBreakingDescription i
   46             ])
   47         ]