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|
{-# LANGUAGE TemplateHaskell, GeneralizedNewtypeDeriving #-}
module Events.Types
( TimeRange(..), rangeStart, rangeDuration
, Event(..), payload, occursWithin
, EvalCtx(..), ctxEvents
, ObjCtx(..), objVars, objOccurs, objPayload, objCtx
, Eval(..)
, module Data.Aeson
, module Data.Time.Clock
, module Data.Default.Class
, module Events.Types.NDT
, module Control.Monad.State.Lazy
, module Control.Monad.Reader
) where
import Control.Lens.TH (makeLenses)
import Control.Lens
import Data.Aeson hiding ((.=))
import Data.Time.Clock
import Data.Default.Class
import Events.Types.NDT (NDT, foldNDT)
import Control.Monad.State.Lazy
import Control.Monad.Reader
import Control.Monad.Catch (MonadThrow)
import Control.Applicative (Alternative(..))
data TimeRange = TimeRange
{ _rangeStart :: UTCTime
, _rangeDuration :: NominalDiffTime
}
makeLenses ''TimeRange
data Event = Event
{ _payload :: Object
, _occursWithin :: TimeRange -> Bool
}
makeLenses ''Event
data EvalCtx = EvalCtx
{ _ctxEvents :: [Object]
} deriving (Show)
makeLenses ''EvalCtx
instance Default EvalCtx where
def = EvalCtx
{ _ctxEvents = mempty
}
data ObjCtx = ObjCtx
{ _objOccurs :: Bool
, _objPayload :: Maybe Object
, _objVars :: Object
}
makeLenses ''ObjCtx
instance Default ObjCtx where
def = ObjCtx
{ _objOccurs = True
, _objPayload = Nothing
, _objVars = mempty
}
objCtx :: Traversal' ObjCtx Object
objCtx fObj ctx
| ctx ^. objOccurs = traverseOf (objPayload . _Just) fObj ctx
| otherwise = pure ctx
newtype Eval m a = Eval { unEval :: StateT ObjCtx (NDT (ReaderT EvalCtx m)) a }
deriving ( MonadState ObjCtx
, MonadReader EvalCtx
, MonadIO
, Functor
, Applicative
, Alternative
, Monad
, MonadPlus
, MonadThrow
)
instance MonadTrans Eval where
lift = Eval . lift . lift . lift
|
