130 lines
2.9 KiB
Idris
130 lines
2.9 KiB
Idris
module Quox.EffExtra
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import public Control.Eff
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import Quox.ST
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import Data.IORef
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export
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localAt : (0 lbl : tag) -> Has (StateL lbl s) fs =>
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(s -> s) -> Eff fs a -> Eff fs a
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localAt lbl f act = do
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old <- getAt lbl
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modifyAt lbl f *> act <* putAt lbl old
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export %inline
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localAt_ : (0 lbl : tag) -> Has (StateL lbl s) fs =>
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s -> Eff fs a -> Eff fs a
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localAt_ lbl x = localAt lbl $ const x
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export %inline
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local : Has (State s) fs => (s -> s) -> Eff fs a -> Eff fs a
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local = localAt ()
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export %inline
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local_ : Has (State s) fs => s -> Eff fs a -> Eff fs a
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local_ = localAt_ ()
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export %inline
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getsAt : (0 lbl : tag) -> Has (StateL lbl s) fs => (s -> a) -> Eff fs a
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getsAt lbl f = f <$> getAt lbl
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export %inline
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gets : Has (State s) fs => (s -> a) -> Eff fs a
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gets = getsAt ()
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export
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handleStateIORef : HasIO m => IORef st -> StateL lbl st a -> m a
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handleStateIORef r Get = readIORef r
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handleStateIORef r (Put s) = writeIORef r s
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export
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handleStateSTRef : HasST m => STRef s st -> StateL lbl st a -> m s a
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handleStateSTRef r Get = readRef r
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handleStateSTRef r (Put s) = writeRef r s
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public export
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data Length : List a -> Type where
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Z : Length []
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S : Length xs -> Length (x :: xs)
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export
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subsetWith : Length xs => (forall z. Has z xs -> Has z ys) ->
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Subset xs ys
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subsetWith @{Z} f = []
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subsetWith @{S len} f = f Z :: subsetWith (f . S)
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export
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subsetSelf : Length xs => Subset xs xs
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subsetSelf = subsetWith id
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export
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subsetTail : Length xs => Subset xs (x :: xs)
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subsetTail = subsetWith S
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-- [fixme] allow the error to be anywhere in the effect list
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export
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wrapErrAt : Length fs => (0 lbl : tag) -> (e -> e') ->
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Eff (ExceptL lbl e :: fs) a -> Eff (ExceptL lbl e' :: fs) a
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wrapErrAt lbl f act =
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rethrowAt lbl . mapFst f =<< lift @{subsetTail} (runExceptAt lbl act)
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export %inline
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wrapErr : Length fs => (e -> e') ->
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Eff (Except e :: fs) a -> Eff (Except e' :: fs) a
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wrapErr = wrapErrAt ()
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export
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handleExcept : Functor m => (forall c. e -> m c) -> ExceptL lbl e a -> m a
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handleExcept thr (Err e) = thr e
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export
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handleReaderConst : Applicative m => r -> ReaderL lbl r a -> m a
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handleReaderConst x Ask = pure x
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public export
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record IOErr e a where
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constructor IOE
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fromIOErr : IO (Either e a)
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export
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Functor (IOErr e) where
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map f (IOE e) = IOE $ map f <$> e
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export
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Applicative (IOErr e) where
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pure x = IOE $ pure $ pure x
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IOE f <*> IOE x = IOE [|f <*> x|]
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export
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Monad (IOErr e) where
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IOE m >>= k = IOE $ do
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case !m of
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Left err => pure $ Left err
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Right x => fromIOErr $ k x
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export
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MonadRec (IOErr e) where
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tailRecM s (Access r) x k = IOE $ do
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let IOE m = k s x
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case !m of
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Left err => pure $ Left err
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Right (Cont s' p y) => fromIOErr $ tailRecM s' (r s' p) y k
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Right (Done y) => pure $ Right y
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export
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HasIO (IOErr e) where
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liftIO = IOE . map Right
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export %inline
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ioLeft : e -> IOErr e a
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ioLeft = IOE . pure . Left
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