trivia (empty) → 0.0

raw patch · 5 files changed

+118/−0 lines, 5 filesdep +basedep +comonaddep +distributivesetup-changed

Dependencies added: base, comonad, distributive

Files

• Control/Comonad/Zero.hs +20/−0
• Control/Monad/One.hs +44/−0
• LICENSE +30/−0
• Setup.hs +2/−0
• trivia.cabal +22/−0

@@ -0,0 +1,20 @@+{-# LANGUAGE DeriveDataTypeable, DeriveFunctor, DeriveFoldable, DeriveTraversable, StandaloneDeriving #-}
+module Control.Comonad.Zero (Zero) where
+import Control.Comonad
+import Data.Traversable
+import Data.Foldable
+import Data.Typeable
+
+data Zero a
+
+deriving instance Show (Zero a)
+deriving instance Eq (Zero a)
+deriving instance Ord (Zero a) 
+deriving instance Functor Zero 
+deriving instance Foldable Zero
+deriving instance Traversable Zero 
+deriving instance Typeable1 Zero
+
+instance Comonad Zero where
+    extract z = extract z
+    extend f e = extend f e

@@ -0,0 +1,44 @@+{-# LANGUAGE DeriveDataTypeable, DeriveFunctor, DeriveFoldable, DeriveTraversable #-}
+module Control.Monad.One (One(..)) where
+
+import Control.Applicative
+import Data.Foldable
+import Data.Traversable
+import Data.Monoid
+import Data.Distributive
+import Control.Monad
+import Data.Typeable
+
+data One a = One deriving (Show, Read, Eq, Ord, Enum, Functor, Foldable, Traversable, Typeable)
+
+instance Monoid (One a) where
+    mempty = One
+    mappend _ _ = One
+
+instance Monad One where
+    return _ = One
+    {-# INLINE return #-}
+    _ >>= _ = One
+    {-# INLINE (>>=) #-}
+
+instance Applicative One where
+    pure _ = One
+    {-# INLINE pure #-}
+    _ <*> _ = One
+    {-# INLINE (<*>) #-}
+
+instance Alternative One where
+    empty = One
+    {-# INLINE empty #-}
+    _ <|> _ = One
+    {-# INLINE (<|>) #-}
+
+instance MonadPlus One where
+    mzero = One
+    mplus _ _ = One
+
+instance Distributive One where
+    distribute _ = One
+    {-# INLINE distribute #-}
+    collect _ _ = One
+    {-# INLINE collect #-}

@@ -0,0 +1,30 @@+Copyright (c) 2014, Fumiaki Kinoshita
+
+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 Fumiaki Kinoshita 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.

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

@@ -0,0 +1,22 @@+name:                trivia
+version:             0.0
+synopsis:            The trivial monad and comonad
+-- description:         
+homepage:            https://github.com/fumieval/trivia
+license:             BSD3
+license-file:        LICENSE
+author:              Fumiaki Kinoshita
+maintainer:          fumiexcel@gmail.com
+-- copyright:           
+category:            Control
+build-type:          Simple
+-- extra-source-files:  
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Control.Monad.One, Control.Comonad.Zero
+  -- other-modules:       
+  other-extensions:    DeriveDataTypeable, DeriveFunctor, DeriveFoldable, DeriveTraversable
+  build-depends:       base == 4.*, distributive, comonad
+  -- hs-source-dirs:      
+  default-language:    Haskell2010