data-fresh (empty) → 0.2013.250

raw patch · 5 files changed

+113/−0 lines, 5 filesdep +basedep +transformerssetup-changed

Dependencies added: base, transformers

Files

LICENSE +30/−0
Setup.hs +2/−0
data-fresh.cabal +23/−0
src/Control/Monad/Trans/Fresh.hs +49/−0
src/Data/Fresh.hs +9/−0

+ LICENSE view

@@ -0,0 +1,30 @@+Copyright (c) 2013, Stijn van Drongelen++All rights reserved.++Redistribution and use in source and binary forms, with or without+modification, are permitted provided that the following conditions are met:++    * Redistributions of source code must retain the above copyright+      notice, this list of conditions and the following disclaimer.++    * Redistributions in binary form must reproduce the above+      copyright notice, this list of conditions and the following+      disclaimer in the documentation and/or other materials provided+      with the distribution.++    * Neither the name of Stijn van Drongelen nor the names of other+      contributors may be used to endorse or promote products derived+      from this software without specific prior written permission.++THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+ Setup.hs view

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

+ data-fresh.cabal view

@@ -0,0 +1,23 @@+name:               data-fresh+version:            0.2013.250+stability:          experimental+category:           Control+synopsis:           An interface for generating fresh values+license:            BSD3+license-file:       LICENSE+copyright:          Copyright (c) 2013 Stijn van Drongelen+author:             Stijn van Drongelen+maintainer:         Stijn van Drongelen <rhymoid@gmail.com>+build-type:         Simple+cabal-version:      >=1.10++source-repository head+    type:               git+    location:           https://github.com/rhymoid/hs-data-fresh.git++library+    default-language:   Haskell2010+    other-extensions:   FlexibleInstances, MultiParamTypeClasses+    exposed-modules:    Control.Monad.Trans.Fresh, Data.Fresh+    build-depends:      base >= 4 && < 5, transformers >= 0.2 && < 1+    hs-source-dirs:     src

+ src/Control/Monad/Trans/Fresh.hs view

@@ -0,0 +1,49 @@+{-# LANGUAGE Haskell2010 #-}+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE MultiParamTypeClasses #-}+module Control.Monad.Trans.Fresh where++import Control.Applicative+import Control.Arrow (first)+import Control.Monad.Trans.Class+import Data.Fresh+import Data.Functor.Identity++newtype FreshT v m a = FreshT { runFreshT :: (v -> (v, v)) -> v -> m (a, v) }++instance Functor m => Functor (FreshT v m) where+    fmap f (FreshT xx) = FreshT $ \sp s -> fmap (first f) (xx sp s)+    x <$ FreshT xx = FreshT $ \sp s -> fmap (setFst x) (xx sp s)+      where+        setFst :: b -> (a, c) -> (b, c)+        setFst x (_, y) = (x, y)++instance (Functor m, Monad m) => Applicative (FreshT v m) where+    pure = return+    FreshT ff <*> FreshT xx = FreshT $ \sp s -> do+        (fv, s1) <- ff sp s    +        (xv, s2) <- xx sp s1+        return (fv xv, s2)+    --FreshT ll *> FreshT rr = FreshT $ undefined+    --FreshT ll <* FreshT rr = FreshT $ undefined++instance Monad m => Monad (FreshT v m) where+    return x = FreshT $ \_ s -> return (x, s)+    FreshT aa >>= f = FreshT $ \sp s -> do+        (a, s1) <- aa sp s+        let FreshT ff = f a+        ff sp s1+    -- (>>) = (*>)++-- TODO Alternative, MonadPlus+-- TODO MonadFix++instance MonadTrans (FreshT v) where+    lift m = FreshT $ \_ s -> do+                r <- m+                return (r, s)++-- TODO MonadIO++instance Applicative m => Fresh v (FreshT v m) where+    fresh = FreshT $ \sp s -> pure (sp s)

+ src/Data/Fresh.hs view

@@ -0,0 +1,9 @@+{-# LANGUAGE Haskell2010 #-}+{-# LANGUAGE MultiParamTypeClasses #-}+module Data.Fresh+    ( Fresh (..)+    ) where++class Fresh v m where+    -- TODO Laws.+    fresh :: m v