diff --git a/CHANGELOG.md b/CHANGELOG.md new file mode 100644 --- /dev/null +++ b/CHANGELOG.md @@ -0,0 +1,5 @@ +# Revision history for imsos-monad + +## 0.1.0.0 -- YYYY-mm-dd + +* First version. Released on an unsuspecting world. diff --git a/LICENSE b/LICENSE new file mode 100644 --- /dev/null +++ b/LICENSE @@ -0,0 +1,339 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. 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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/imsos-monad.cabal b/imsos-monad.cabal new file mode 100644 --- /dev/null +++ b/imsos-monad.cabal @@ -0,0 +1,83 @@ +cabal-version: 3.0 +-- The cabal-version field refers to the version of the .cabal specification, +-- and can be different from the cabal-install (the tool) version and the +-- Cabal (the library) version you are using. As such, the Cabal (the library) +-- version used must be equal or greater than the version stated in this field. +-- Starting from the specification version 2.2, the cabal-version field must be +-- the first thing in the cabal file. + +-- Initial package description 'imsos-monad' generated by +-- 'cabal init'. For further documentation, see: +-- http://haskell.org/cabal/users-guide/ +-- +-- The name of the package. +name: imsos-monad + +-- The package version. +-- See the Haskell package versioning policy (PVP) for standards +-- guiding when and how versions should be incremented. +-- https://pvp.haskell.org +-- PVP summary: +-+------- breaking API changes +-- | | +----- non-breaking API additions +-- | | | +--- code changes with no API change +version: 0.1.0.0 + +-- A short (one-line) description of the package. +synopsis: + MonadIMSOS combines State, Error, Reader and Writer. + +-- A longer description of the package. +description: + A Monad providing an abstraction based on the Implicitly Modular Structural Operational Semantics (I-MSOS) approach to specifying programming language semantics + +-- URL for the project homepage or repository. +homepage: https://haskell-omelet.org + +-- The license under which the package is released. +license: GPL-2.0-or-later + +-- The file containing the license text. +license-file: LICENSE + +-- The package author(s). +author: L. Thomas van Binsbergen + +-- An email address to which users can send suggestions, bug reports, and patches. +maintainer: ltvanbinsbergen@acm.org + +-- A copyright notice. +-- copyright: +category: Control +build-type: Simple + +-- Extra doc files to be distributed with the package, such as a CHANGELOG or a README. +extra-doc-files: CHANGELOG.md + +-- Extra source files to be distributed with the package, such as examples, or a tutorial module. +-- extra-source-files: + +common warnings + ghc-options: -Wall + +library + -- Import common warning flags. + import: warnings + + -- Modules exported by the library. + exposed-modules: Control.Monad.IMSOS + + -- Modules included in this library but not exported. + -- other-modules: + + -- LANGUAGE extensions used by modules in this package. + -- other-extensions: + + -- Other library packages from which modules are imported. + build-depends: base ^>=4.18.3.0 + ,mtl ^>= 2.3.1 + + -- Directories containing source files. + hs-source-dirs: src + + -- Base language which the package is written in. + default-language: Haskell2010 diff --git a/src/Control/Monad/IMSOS.hs b/src/Control/Monad/IMSOS.hs new file mode 100644 --- /dev/null +++ b/src/Control/Monad/IMSOS.hs @@ -0,0 +1,92 @@ +{-# LANGUAGE UndecidableInstances + , FlexibleInstances + , FlexibleContexts + , MultiParamTypeClasses +#-} + +module Control.Monad.IMSOS + (MonadIMSOS(..), runIMSOS, yieldIMSOS + ,tell + ,local, reader + ,get, put, state + ,fail, throwError, catchError + ) where + +import Control.Applicative (Alternative(..)) +import Control.Monad.Error.Class +import Control.Monad.Reader (MonadReader(..)) +import Control.Monad.State (MonadState(..)) +import Control.Monad.Writer (MonadWriter(..)) +import Control.Monad (ap) + +newtype MonadIMSOS r s w me e a = MonadIMSOS (r -> s -> me e (a, s, w)) + +instance Functor (me e) => Functor (MonadIMSOS r s w me e) where + fmap f (MonadIMSOS m) = MonadIMSOS m' + where m' r s = modify <$> m r s + where modify (a, s', w) = (f a, s', w) + +instance (MonadError e (me e), Monad (me e), Monoid w) + => Monad (MonadIMSOS r s w me e) where + (MonadIMSOS p) >>= m = MonadIMSOS $ \r1 s1 -> do + (a, s2, w2) <- p r1 s1 + let MonadIMSOS q = m a + (b, s3, w3) <- q r1 s2 + return (b, s3, w2 <> w3) + +instance (MonadError e (me e), Monad (me e), Monoid w) + => Applicative (MonadIMSOS r s w me e) where + pure a = MonadIMSOS m + where m _ s = pure (a, s, mempty) + (<*>) = ap + +instance (MonadError e (me e), Monad (me e), Alternative (me e), Monoid w) + => Alternative (MonadIMSOS r s w me e) where + empty = MonadIMSOS (\_ _ -> empty) + (MonadIMSOS p) <|> (MonadIMSOS q) = MonadIMSOS m + where m r s = p r s `catchError` \_ -> q r s + +--instance (MonadError e (me e), Monad (me e), Monoid w) +-- => MonadPlus (MonadIMSOS r s w me e) + +instance (MonadError String (me String), Monad (me String), Monoid w) + => MonadFail (MonadIMSOS r s w me String) where + fail = throwError + +instance (MonadError e (me e), Monad (me e), Monoid w) + => MonadReader r (MonadIMSOS r s w me e) where + ask = MonadIMSOS m + where m r s = pure (r, s, mempty) + local f (MonadIMSOS p) = MonadIMSOS m + where m r s = p (f r) s + +instance (MonadError e (me e), Monad (me e), Monoid w) + => MonadState s (MonadIMSOS r s w me e) where + state act = MonadIMSOS m + where m _ s = pure (a, s', mempty) + where (a, s') = act s + +instance (MonadError e (me e), Monad (me e), Monoid w) + => MonadWriter w (MonadIMSOS r s w me e) where + tell w = MonadIMSOS m + where m _ s = pure ((), s, w) + listen (MonadIMSOS p) = MonadIMSOS m + where m r s = p r s >>= \(a, s', w) -> pure ((a,w), s', w) + pass (MonadIMSOS p) = MonadIMSOS m + where m r s = p r s >>= \((a,f), s', w) -> pure (a, s', f w) + +instance (MonadError e (me e), Monad (me e), Monoid w) + => MonadError e (MonadIMSOS r s w me e) where + throwError e = MonadIMSOS m + where m _ _ = throwError e + catchError (MonadIMSOS p) h = MonadIMSOS m + where m r s = p r s `catchError` \e -> + let MonadIMSOS q = h e + in q r s -- continues with a state as if p not executed + +runIMSOS :: r -> s -> MonadIMSOS r s w me e a -> me e (a, s, w) +runIMSOS r s (MonadIMSOS f) = f r s + +yieldIMSOS :: Functor (me e) => + r -> s -> ((a, s, w) -> y) -> MonadIMSOS r s w me e a -> me e y +yieldIMSOS r s toyield m = toyield <$> runIMSOS r s m