never executed always true always false

    1 {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
    2 {-# LANGUAGE UndecidableInstances #-}
    3 
    4 module Conjure.Language.Expression.Op.Or where
    5 
    6 import Conjure.Prelude
    7 import Conjure.Language.Expression.Op.Internal.Common
    8 
    9 import qualified Data.Aeson as JSON             -- aeson
   10 import qualified Data.Aeson.KeyMap as KM
   11 
   12 import qualified Data.Vector as V               -- vector
   13 
   14 
   15 data OpOr x = OpOr x
   16     deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
   17 
   18 instance Serialize x => Serialize (OpOr x)
   19 instance Hashable  x => Hashable  (OpOr x)
   20 instance ToJSON    x => ToJSON    (OpOr x) where toJSON = genericToJSON jsonOptions
   21 instance FromJSON  x => FromJSON  (OpOr x) where parseJSON = genericParseJSON jsonOptions
   22 
   23 instance BinaryOperator (OpOr x) where
   24     opLexeme _ = L_Or
   25 
   26 instance (TypeOf x, Pretty x, ExpressionLike x) => TypeOf (OpOr x) where
   27     typeOf p@(OpOr x) = do
   28         ty <- typeOf x
   29         case ty of
   30             TypeList TypeAny -> return TypeBool
   31             TypeList TypeBool -> return TypeBool
   32             TypeMatrix _ TypeAny -> return TypeBool
   33             TypeMatrix _ TypeBool -> return TypeBool
   34             TypeSet TypeBool -> return TypeBool
   35             TypeMSet TypeBool -> return TypeBool
   36             _ -> raiseTypeError $ vcat [ pretty p
   37                                        , "The argument has type:" <+> pretty ty
   38                                        ]
   39 
   40 instance (OpOr x :< x) => SimplifyOp OpOr x where
   41     simplifyOp (OpOr x)
   42         | Just xs <- listOut x
   43         , let filtered = filter (/= fromBool True) xs
   44         , length filtered /= length xs      -- there were true's
   45         = return $ fromBool True
   46     simplifyOp (OpOr x)
   47         | Just xs <- listOut x
   48         , let filtered = filter (/= fromBool False) xs
   49         , length filtered /= length xs      -- there were false's
   50         = return $ inject $ OpOr $ fromList filtered
   51     simplifyOp _ = na "simplifyOp{OpOr}"
   52 
   53 instance (Pretty x, ExpressionLike x) => Pretty (OpOr x) where
   54     prettyPrec prec op@(OpOr x) | Just [a,b] <- listOut x = prettyPrecBinOp prec [op] a b
   55     prettyPrec _ (OpOr x) = "or" <> prParens (pretty x)
   56 
   57 instance (VarSymBreakingDescription x, ExpressionLike x) => VarSymBreakingDescription (OpOr x) where
   58     varSymBreakingDescription (OpOr x) | Just xs <- listOut x = JSON.Object $ KM.fromList
   59         [ ("type", JSON.String "OpOr")
   60         , ("children", JSON.Array $ V.fromList $ map varSymBreakingDescription xs)
   61         , ("symmetricChildren", JSON.Bool True)
   62         ]
   63     varSymBreakingDescription (OpOr x) = JSON.Object $ KM.fromList
   64         [ ("type", JSON.String "OpOr")
   65         , ("children", varSymBreakingDescription x)
   66         ]