lists (empty) → 0.0.0

raw patch · 4 files changed

+94/−0 lines, 4 filesdep +basedep +boolssetup-changed

Dependencies added: base, bools

Files

• LICENSE +30/−0
• Setup.hs +2/−0
• lists.cabal +19/−0
• src/Data/Lists.hs +43/−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 +1,19 @@+name:                lists+version:             0.0.0+synopsis:            Functions for dealing with lists+description:         Functions for dealing with lists+license:             BSD3+license-file:        LICENSE+author:              Chris Done+maintainer:          chrisdone@gmail.com+copyright:           2013 Chris Done+category:            CATEGORY+build-type:          Simple+cabal-version:       >=1.8++library+  exposed-modules:   Data.Lists+  hs-source-dirs:    src/+  build-depends:     base > 4 && <5,+                     bools+  ghc-options:       -Wall

@@ -0,0 +1,43 @@+-- | Extra functions for dealing with lists.++module Data.Lists+  (list+  ,unionOf+  ,for+  ,lastToMaybe+  ,firstOr+  ,maxList+  ,module Data.List)+  where++import Data.Bools+import Data.List+import Data.Maybe++-- | When a list is non-null, pass it to a function, otherwise use the+-- default.+list :: b -> ([a] -> b) -> [a] -> b+list nil cons = cond (const nil) cons null++-- | Get the union of the given lists.+unionOf :: (Eq a) => [[a]] -> [a]+unionOf = foldr union []++-- | Opposite of map.+for :: [a] -> (a -> b) -> [b]+for = flip map++-- | Maybe get the last element in the list.+lastToMaybe :: [a] -> Maybe a+lastToMaybe [x]    = Just x+lastToMaybe (_:xs) = lastToMaybe xs+lastToMaybe []     = Nothing++-- | Return the first item of a list or something else.+firstOr :: a -> [a] -> a+firstOr n = fromMaybe n . listToMaybe++-- | Get the maximum of a list or return zero.+maxList :: (Num t, Ord t) => [t] -> t+maxList [] = 0+maxList xs = maximum xs