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|
{-# LANGUAGE TemplateHaskell #-}
module Events.Types
( TimeRange(..), rangeStart, rangeDuration
, Event(..), payload, occursWithin
, SpecCtx(..), ctxVars
, Spec
, module Data.Aeson
, module Data.Time.Clock
, module Data.Default.Class
) where
import Control.Lens.TH
import Data.Aeson (Object)
import Data.Time.Clock
import Control.Monad.Reader
import ListT (ListT)
import qualified ListT as ListT
import Data.Default.Class
import Data.Monoid
import Control.Monad.Fix
import Control.Lens
import Data.Maybe
data TimeRange = TimeRange
{ _rangeStart :: UTCTime
, _rangeDuration :: NominalDiffTime
}
makeLenses ''TimeRange
data Event = Event
{ _payload :: Object
, _occursWithin :: TimeRange -> Bool
}
makeLenses ''Event
data SpecCtx = SpecCtx
{ _ctxVars :: Object
, _ctxEvents :: [Event]
}
makeLenses ''SpecCtx
instance Default SpecCtx where
def = SpecCtx
{ _ctxVars = mempty
, _ctxEvents = mempty
}
type Spec m a = ListT (ReaderT SpecCtx m) a
interpret :: MonadFix m => Spec m (Maybe Event) -> m [Event]
interpret x = catMaybes <$> mfix x'
where
x' = runReaderT (ListT.toList x) . flip (set ctxEvents) def . catMaybes
|
