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cat.ex
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defmodule Cat do
@moduledoc """
Inspired by [cats](https://github.com/typelevel/cats) and [cats-effect (2)](https://github.com/typelevel/cats-effect)
"""
# # Data # #
alias Cat.{Either, Maybe}
@type maybe(a) :: Maybe.t(a)
@type either(l, r) :: Either.t(l, r)
# # Protocols # #
alias Cat.{Functor, Applicative, Monad, MonadError}
alias Cat.{Semigroup, Monoid, Foldable, Reducible}
## Delegates to protocols ##
# Functor
@spec map(Functor.t(a), (a -> b)) :: Functor.t(b) when a: var, b: var
defdelegate map(ta, f), to: Functor
@spec as(Functor.t(any), a) :: Functor.t(a) when a: var
defdelegate as(t, a), to: Functor
# Applicative
@spec pure(Applicative.t(any), a) :: Applicative.t(a) when a: var
defdelegate pure(example, a), to: Applicative
@spec ap(Applicative.t((a -> b)), Applicative.t(a)) :: Applicative.t(b) when a: var, b: var
defdelegate ap(tf, ta), to: Applicative
@spec product(Applicative.t(a), Applicative.t(b)) :: Applicative.t({a, b}) when a: var, b: var
defdelegate product(ta, tb), to: Applicative
@spec product_l(Applicative.t(a), Applicative.t(any)) :: Applicative.t(a) when a: var
defdelegate product_l(ta, tb), to: Applicative
@spec product_r(Applicative.t(any), Applicative.t(b)) :: Applicative.t(b) when b: var
defdelegate product_r(ta, tb), to: Applicative
@spec map2(Applicative.t(a), Applicative.t(b), (a, b -> c)) :: Applicative.t(c) when a: var, b: var, c: var
defdelegate map2(ta, tb, f), to: Applicative
# Monad
@spec flat_map(Monad.t(a), (a -> Monad.t(b))) :: Monad.t(b) when a: var, b: var
defdelegate flat_map(ta, f), to: Monad
@spec flat_tap(Monad.t(a), (a -> Monad.t(no_return))) :: Monad.t(a) when a: var
defdelegate flat_tap(ta, f), to: Monad
@spec flatten(Monad.t(Monad.t(a))) :: Monad.t(a) when a: var
defdelegate flatten(tta), to: Monad
# MonadError
@spec raise(MonadError.t(any), error) :: MonadError.t(none) when error: any
defdelegate raise(example, error), to: MonadError
@spec recover(MonadError.t(a), (error -> MonadError.t(a))) :: MonadError.t(a) when a: var, error: any
defdelegate recover(ta, f), to: MonadError
@spec lift_ok_or_error(MonadError.t(any), MonadError.ok_or_error(a)) :: MonadError.t(a) when a: var
defdelegate lift_ok_or_error(example, result), to: MonadError
@spec attempt(MonadError.t(a)) :: MonadError.t(MonadError.ok_or_error(a)) when a: var
defdelegate attempt(ta), to: MonadError
# Semigroup
@spec combine(Semigroup.t(), Semigroup.t()) :: Semigroup.t()
defdelegate combine(a, b), to: Semigroup
# Monoid
@spec zero(Monoid.t()) :: Monoid.t()
defdelegate zero(example), to: Monoid
# Foldable
@spec fold_left(Foldable.t(a), b, (b, a -> b)) :: b when a: var, b: var
defdelegate fold_left(ta, zero, f), to: Foldable
# Reducible
@spec reduce_left(Reducible.t(a), (a, a -> a)) :: a when a: var
defdelegate reduce_left(ta, f), to: Reducible
## Delegates to protocols' arrows
defmodule Arrow do
# Functor
@spec map((a -> b)) :: (Functor.t(a) -> Functor.t(b)) when a: var, b: var
defdelegate map(f), to: Functor.Arrow
@spec as(Functor.t(any)) :: (a -> Functor.t(a)) when a: var
defdelegate as(t), to: Functor.Arrow
# Applicative
@spec pure(Applicative.t(any)) :: (a -> Applicative.t(a)) when a: var
defdelegate pure(example), to: Applicative.Arrow
@spec ap(Applicative.t((a -> b))) :: (Applicative.t(a) -> Applicative.t(b))when a: var, b: var
defdelegate ap(tf), to: Applicative.Arrow
@spec product_l(Applicative.t(any)) :: (Applicative.t(a) -> Applicative.t(a)) when a: var
defdelegate product_l(tb), to: Applicative.Arrow
@spec product_r(Applicative.t(any)) :: (Applicative.t(b) -> Applicative.t(b)) when b: var
defdelegate product_r(ta), to: Applicative.Arrow
@spec map2((a, b -> c)) :: (Applicative.t(a), Applicative.t(b) -> Applicative.t(c)) when a: var, b: var, c: var
defdelegate map2(f), to: Applicative.Arrow
# Monad
@spec flat_map((a -> Monad.t(b))) :: (Monad.t(a) -> Monad.t(b)) when a: var, b: var
defdelegate flat_map(f), to: Monad.Arrow
# MonadError
@spec raise(error) :: (MonadError.t(any) -> MonadError.t(none)) when error: any
defdelegate raise(example), to: MonadError.Arrow
@spec recover((error -> MonadError.t(a))) :: (MonadError.t(a) -> MonadError.t(a)) when a: var, error: any
defdelegate recover(ta), to: MonadError.Arrow
@spec on_error(MonadError.t(a), (error -> MonadError.t(no_return) | no_return)) :: MonadError.t(a) when a: var, error: any
defdelegate on_error(ta, f), to: MonadError
@spec lift_ok_or_error(MonadError.t(any)) :: (MonadError.ok_or_error(a) -> MonadError.t(a)) when a: var
defdelegate lift_ok_or_error(example), to: MonadError.Arrow
end
# # Effect # #
defmodule Effect do
alias Cat.Effect.{Async, Bracket, Sync}
## Delegates to protocols ##
# Bracket
# @spec bracket(
# acquire: Bracket.t(a),
# use: (a -> Bracket.t(b)),
# release: (Bracket.exit_case(a) -> Bracket.t(no_return))
# ) :: Bracket.t(b) when a: var, b: var
# def bracket(acquire: acquire, use: use, release: release), do:
# Bracket.bracket(acquire, use, release)
#
# @spec guarantee(Bracket.t(a), finalize: Bracket.t(no_return)) :: Bracket.t(a) when a: var
# def guarantee(ta, finalize: finalizer), do:
# Bracket.guarantee(ta, finalizer)
#
# @spec uncancelable(Bracket.t(a)) :: Bracket.t(a) when a: var
# defdelegate uncancelable(ta), to: Bracket
# Sync
@spec defer(Sync.t(any), (-> Sync.t(a))) :: Sync.t(a) when a: var
defdelegate defer(example, taf), to: Sync
@spec delay(Sync.t(any), (-> a)) :: Sync.t(a) when a: var
defdelegate delay(example, xf), to: Sync
# Async
@spec async(Async.t(any), (Async.callback(a) -> Async.t(no_return) | no_return)) :: Async.t(a) when a: var
defdelegate async(example, fun), to: Async
@spec async_effect(Async.t(a), (Bracket.exit_case(a) -> Async.t(no_return))) :: Async.t(no_return) when a: var
defdelegate async_effect(effect, on_complete), to: Async
@spec never(Async.t(any)) :: Async.t(none)
defdelegate never(example), to: Async
## Delegates to protocols' arrows
defmodule Arrow do
# Bracket
# @spec bracket(
# acquire: Bracket.t(a),
# release: (Bracket.exit_case(a) -> Bracket.t(no_return))
# ) :: (Bracket.Arrow.use(a, b) -> Bracket.t(b)) when a: var, b: var
# def bracket(acquire: acquire, release: release), do: Bracket.Arrow.bracket(acquire: acquire, release: release)
#
# @spec guarantee(Bracket.t(no_return)) :: (Bracket.t(a) -> Bracket.t(a)) when a: var
# defdelegate guarantee(finalizer), to: Bracket.Arrow
# Sync
@spec delay(Sync.t(any)) :: ((-> a) -> Sync.t(a)) when a: var
defdelegate delay(example), to: Sync.Arrow
# Async
@spec async(Async.t(any)) :: ((Async.callback(a) -> Async.t(no_return) | no_return) -> Async.t(a)) when a: var
defdelegate async(example), to: Async.Arrow
@spec async_effect((Bracket.exit_case(a) -> Async.t(no_return))) :: (Async.t(a) -> Async.t(no_return)) when a: var
defdelegate async_effect(on_complete), to: Async.Arrow
end
end
end