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{-# LANGUAGE GADTs, DataKinds, TypeOperators #-}
module Events.Spec
( interpret
, Spec, Cmnd(..), Expr(..), Elem(..)
) where
import Events.Types
import Events.Spec.Types
import Events.Spec.Eval
import Control.Monad ((<=<))
import Control.Monad.IO.Class
import Control.Monad.State.Lazy
import Data.Monoid
import Data.Foldable
import Control.Lens
import Debug.Trace
type Spec m = Expr (Eval m) '[] Cmnd -- most significant last
data Cmnd = COverride Object
| COccurs Bool
| CNop
deriving (Show)
interpret :: MonadIO m => Spec m -> Eval m ()
interpret = join . fmap interpretCmnd . evalExpr
interpretCmnd :: MonadIO m => Cmnd -> Eval m ()
interpretCmnd (COverride obj) = objPayload ?= obj
interpretCmnd (COccurs b) = objOccurs .= b
interpretCmnd _ = return ()
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