cabal-version:       1.18
name:                AsyncRattus
version:             0.2.0.1
category:            FRP
synopsis:            An asynchronous modal FRP language
description:

            This library implements the Async Rattus programming
            language as an embedded DSL. To this end the library
            provides a GHC plugin that checks the stricter typing
            rules of Async Rattus.
            
            
            What follows is a brief introduction to the language and
            its usage. A more detailed introduction can be found in
            this <src/docs/paper.pdf paper>.
            
            .
            
            Async Rattus is a functional reactive programming (FRP)
            language that uses modal types to express temporal
            dependencies. In return the language will guarantee that
            programs are productive (in each computation step, the
            program makes progress), causal (output depends only on
            current and earlier input), and have no space leaks
            (programs do not implicitly retain memory over time).
            
            .
            
            The modal type constructor @O@ (pronounced "later") is
            used to express the passage of time at the type
            level. Intuitively speaking, a value of type @O a@
            represents a computation that will produce a value of type
            @a@ in the next time step. Additionally, the language also
            features the @Box@ modal type constructor. A value of type
            @Box a@ is a time-independent computation that can be
            executed at any time to produce a value of type @a@.

            .

            For example, the type of signals is defined as

            .

            > data Sig a = a ::: (O (Sig a))

            .

            So the current value of the signal is available now, but
            its future state is only available in the next time
            step. Writing a @map@ function for this type of streams,
            requires us to use the @Box@ modality:

            .

            > map :: Box (a -> b) -> Sig a -> Sig b
            > map f (x ::: xs) = unbox f x ::: delay (map f (adv xs))

            .

            This makes sure that the function @f@ that we give to
            @map@ is available at any time in the future.

            .

            The core of the language is defined in the module
            "AsyncRattus.Primitives". Note that the operations on @O@
            and @Box@ have non-standard typing rules. Therefore, this
            library provides a compiler plugin that checks these
            non-standard typing rules. To write Async Rattus programs,
            you must enable this plugin via the GHC option
            @-fplugin=AsyncRattus.Plugin@, e.g. by including the following
            line in the source file:
            
            .
            
            > {-# OPTIONS -fplugin=AsyncRattus.Plugin #-}
            
            .

            Below is a minimal Async Rattus program using the
            "AsyncRattus.Signal" module for programming with signals:

            .

            > {-# OPTIONS -fplugin=AsyncRattus.Plugin #-}
            >     
            > import AsyncRattus
            > import AsyncRattus.Signal
            > 
            > sums :: Sig Int -> Sig Int
            > sums = scan (box (+)) 0

            .

            The <docs/src/AsyncRattus.Signal.html source code of the AsyncRattus.Signal module>
            provides more examples on how to program in Async Rattus.
            An example project using Async Rattus can be found
            <https://github.com/pa-ba/AsyncRattus/tree/master/examples/console here>.

homepage:            https://github.com/pa-ba/AsyncRattus/
bug-reports:         https://github.com/pa-ba/AsyncRattus/issues
License:             BSD3
License-file:        LICENSE
copyright:           Copyright (C) 2023 Emil Houlborg, Gregers Rørdam, Patrick Bahr
Author:              Emil Houlborg, Gregers Rørdam, Patrick Bahr
maintainer:          Patrick Bahr <paba@itu.dk>
stability:           experimental

build-type:          Custom

extra-source-files:  CHANGELOG.md

extra-doc-files:     docs/paper.pdf
                     
custom-setup
  setup-depends:
    base  >= 4.5 && < 5,
    Cabal >= 1.18  && < 4


library
  exposed-modules:     AsyncRattus
                       AsyncRattus.Signal
                       AsyncRattus.Future
                       AsyncRattus.Strict
                       AsyncRattus.Plugin
                       AsyncRattus.Primitives
                       AsyncRattus.InternalPrimitives
                       AsyncRattus.Channels
                       AsyncRattus.Plugin.Annotation
                                              
  other-modules:       AsyncRattus.Plugin.ScopeCheck
                       AsyncRattus.Plugin.SingleTick
                       AsyncRattus.Plugin.CheckClockCompatibility
                       AsyncRattus.Plugin.Strictify
                       AsyncRattus.Plugin.Utils
                       AsyncRattus.Plugin.Dependency
                       AsyncRattus.Plugin.StableSolver
                       AsyncRattus.Plugin.Transform
                       AsyncRattus.Plugin.PrimExpr
  build-depends:       base >=4.16 && <5,
                       containers >= 0.6.5 && < 0.8,
                       ghc >= 9.2 && < 9.9,
                       ghc-boot >= 9.2 && < 9.9,
                       hashtables >= 1.3.1 && < 1.4,
                       simple-affine-space >= 0.2.1 && < 0.3,
                       transformers >= 0.5.6 && < 0.7
  hs-source-dirs:      src
  default-language:    Haskell2010
  ghc-options:         -W



Test-Suite ill-typed
  type:                exitcode-stdio-1.0
  main-is:             test/IllTyped.hs
  default-language:    Haskell2010
  build-depends:       AsyncRattus, base
  ghc-options:         -fplugin=AsyncRattus.Plugin


Test-Suite well-typed
  type:                exitcode-stdio-1.0
  main-is:             WellTyped.hs
  hs-source-dirs:      test
  default-language:    Haskell2010
  build-depends:       AsyncRattus, base, containers, text
  ghc-options:         -fplugin=AsyncRattus.Plugin