content: {-# LANGUAGE DeriveGeneric, DeriveDataTypeable, DeriveFunctor, DeriveTraversable, DeriveFoldable #-}
  
  module Conjure.Language.Expression.Op.Hist where
  
  import Conjure.Prelude
  import Conjure.Language.Expression.Op.Internal.Common
  
  import qualified Data.Aeson as JSON             -- aeson
  import qualified Data.Aeson.KeyMap as KM
  
  import qualified Data.Vector as V               -- vector
  
  
  data OpHist x = OpHist x
      deriving (Eq, Ord, Show, Data, Functor, Traversable, Foldable, Typeable, Generic)
  
  instance Serialize x => Serialize (OpHist x)
  instance Hashable  x => Hashable  (OpHist x)
  instance ToJSON    x => ToJSON    (OpHist x) where toJSON = genericToJSON jsonOptions
  instance FromJSON  x => FromJSON  (OpHist x) where parseJSON = genericParseJSON jsonOptions
  
  instance (TypeOf x, Pretty x) => TypeOf (OpHist x) where
      typeOf p@(OpHist a) = do
          tyA <- typeOf a
          case tyA of
              TypeMSet     aInner -> return $ TypeMatrix (TypeInt TagInt) $ TypeTuple [aInner, (TypeInt TagInt)]
              TypeMatrix _ aInner -> return $ TypeMatrix (TypeInt TagInt) $ TypeTuple [aInner, (TypeInt TagInt)]
              TypeList     aInner -> return $ TypeMatrix (TypeInt TagInt) $ TypeTuple [aInner, (TypeInt TagInt)]
              _ -> raiseTypeError p
  
  instance SimplifyOp OpHist x where
      simplifyOp _ = na "simplifyOp{OpHist}"
  
  instance Pretty x => Pretty (OpHist x) where
      prettyPrec _ (OpHist a) = "hist" <> prParens (pretty a)
  
  instance VarSymBreakingDescription x => VarSymBreakingDescription (OpHist x) where
      varSymBreakingDescription (OpHist a) = JSON.Object $ KM.fromList
          [ ("type", JSON.String "OpHist")
          , ("children", JSON.Array $ V.fromList
              [ varSymBreakingDescription a
              ])
          ]
  