data-extra (empty) → 1.0.0

raw patch · 5 files changed

+95/−0 lines, 5 filesdep +basesetup-changed

Dependencies added: base

Files

• LICENSE +30/−0
• Setup.hs +2/−0
• data-extra.cabal +18/−0
• src/Data/Either/Extra.hs +35/−0
• src/Data/Maybe/Extra.hs +10/−0

@@ -0,0 +1,30 @@+Copyright (c) 2013, Chris Done++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 Chris Done 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 +1,18 @@+name:                data-extra+version:             1.0.0+synopsis:            Extra utilities for working on Data.* types.+description:         Extra utilities for working on Data.* types.+license:             BSD3+license-file:        LICENSE+author:              Chris Done+maintainer:          chrisdone@gmail.com+copyright:           2013 Chris Done+category:            Data+build-type:          Simple+cabal-version:       >=1.8++library+  exposed-modules:   Data.Either.Extra, Data.Maybe.Extra+  hs-source-dirs:    src/+  build-depends:     base > 4 && <5+  ghc-options:       -Wall

@@ -0,0 +1,35 @@+-- | Extra functions for dealing with Either.++module Data.Either.Extra where++-- | A map for Either values.+mapEither :: (a -> b1) -> (b -> b2) -> Either a b -> Either b1 b2+mapEither l r = either (Left . l) (Right . r)++-- | Maybe get the left side of an Either.+leftToMaybe :: Either a b -> Maybe a+leftToMaybe = either Just (const Nothing)++-- | Maybe get the right side of an Either.+rightToMaybe :: Either a b -> Maybe b+rightToMaybe = either (const Nothing) Just++-- | Is a value Left?+isLeft :: Either a b -> Bool+isLeft (Left _) = True+isLeft (Right _) = False++-- | Is a value Right?+isRight :: Either a b -> Bool+isRight (Left _) = False+isRight (Right _) = True++-- | Extract the left value or a default.+fromLeft :: a -> Either a b -> a+fromLeft _ (Left x) = x+fromLeft x _ = x++-- | Extract the right value or a default.+fromRight :: b -> Either a b -> b+fromRight _ (Right x) = x+fromRight x _ = x

@@ -0,0 +1,10 @@+-- | Extra functions for dealing with Maybe.++module Data.Maybe.Extra where++import Control.Monad++-- | When the predicate is true, return maybe the action's return value.+whenMaybe :: Monad m => Bool -> m a -> m (Maybe a)+whenMaybe False _ = return Nothing+whenMaybe True m = liftM Just m