never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
    2 
    3 module Conjure.Language.Expression.Op.Imply 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 OpImply x = OpImply x x
   15     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   16 
   17 instance Serialize x => Serialize (OpImply x)
   18 instance Hashable  x => Hashable  (OpImply x)
   19 instance ToJSON    x => ToJSON    (OpImply x) where toJSON = genericToJSON jsonOptions
   20 instance FromJSON  x => FromJSON  (OpImply x) where parseJSON = genericParseJSON jsonOptions
   21 
   22 instance BinaryOperator (OpImply x) where
   23     opLexeme _ = L_Imply
   24 
   25 instance (TypeOf x, Pretty x) => TypeOf (OpImply x) where
   26     typeOf p@(OpImply a b) = boolToBoolToBool p a b
   27 
   28 instance SimplifyOp OpImply x where
   29     simplifyOp (OpImply a b)
   30         | fromBool True  == a = return b
   31         | fromBool False == a = return $ fromBool True
   32         | fromBool True  == b = return $ fromBool True
   33     simplifyOp _ = na "simplifyOp{OpImply}"
   34 
   35 instance Pretty x => Pretty (OpImply x) where
   36     prettyPrec prec op@(OpImply a b) = prettyPrecBinOp prec [op] a b
   37 
   38 instance VarSymBreakingDescription x => VarSymBreakingDescription (OpImply x) where
   39     varSymBreakingDescription (OpImply a b) = JSON.Object $ KM.fromList
   40         [ ("type", JSON.String "OpImply")
   41         , ("children", JSON.Array $ V.fromList
   42             [ varSymBreakingDescription a
   43             , varSymBreakingDescription b
   44             ])
   45         ]