safe-length (empty) → 0.1.0.0

raw patch · 11 files changed

+156/−0 lines, 11 filesdep +QuickCheckdep +basedep +hspecsetup-changed

Dependencies added: QuickCheck, base, hspec, hspec-core, safe-length, should-not-typecheck

Files

• LICENSE +30/−0
• Setup.hs +2/−0
• example/BrokenTuple.hs +4/−0
• example/GoodTuple.hs +8/−0
• example/List.hs +7/−0
• example/NestedList.hs +8/−0
• example/OldList.hs +8/−0
• example/Tuple.hs +7/−0
• safe-length.cabal +36/−0
• src/Safe/Length.hs +9/−0
• tests/Main.hs +37/−0

@@ -0,0 +1,30 @@+Copyright (c) 2015, Jeremy Shaw++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 Jeremy Shaw 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 +1,4 @@+module Main where++main :: IO ()+main = print $ length ('a', 'b')

@@ -0,0 +1,8 @@+module Main where++import Safe.Length (safeLength)+import Data.Proxy (Proxy(..))++main :: IO ()+main = print $ safeLength (Proxy :: Proxy (Char, Char)) ('a', 'b')+

@@ -0,0 +1,7 @@+module Main where++import Data.Proxy (Proxy(..))+import Safe.Length (safeLength)++main :: IO ()+main = print $ safeLength (Proxy :: Proxy [Char]) ['a', 'b']

@@ -0,0 +1,8 @@+module Main where++import Data.Proxy (Proxy(..))+import Safe.Length (safeLength)++main :: IO ()+main = print $ safeLength (Proxy :: Proxy [[Char]]) (head [['a', 'b', 'c']])+

@@ -0,0 +1,8 @@+module Main where++import GHC.OldList as OldList++main :: IO ()+main = print $ OldList.length (head [['a','b','c']])++

@@ -0,0 +1,7 @@+module Main where++import Data.Proxy (Proxy(..))+import Safe.Length (safeLength)++main :: IO ()+main = print $ safeLength (Proxy :: Proxy [Char]) ('a', 'b')

@@ -0,0 +1,36 @@+name:                safe-length+version:             0.1.0.0+synopsis:            Tired of accidentally calling length on tuples? Relief at last!+homepage:            http://www.github.com/stepcut/safe-length+license:             BSD3+license-file:        LICENSE+author:              Jeremy Shaw+maintainer:          jeremy@n-heptane.com+category:            Data+build-type:          Simple+cabal-version:       >=1.10+data-files:+    example/BrokenTuple.hs+    example/GoodTuple.hs+    example/List.hs+    example/NestedList.hs+    example/OldList.hs+    example/Tuple.hs++library+  exposed-modules:     Safe.Length+  build-depends:       base >=4.8 && <4.9+  hs-source-dirs:      src+  default-language:    Haskell2010++test-suite tests+  type:                exitcode-stdio-1.0+  main-is:             Main.hs+  hs-source-dirs:      tests+  build-depends:       base,+                       hspec,+                       hspec-core,+                       QuickCheck,+                       safe-length,+                       should-not-typecheck+  default-language:    Haskell2010

@@ -0,0 +1,9 @@+module Safe.Length where++import Data.Proxy (Proxy(..))++safeLength :: (Foldable f) => Proxy (f a) -> f a -> Int+safeLength _ f = length f++list :: Proxy [a]+list = Proxy

@@ -0,0 +1,37 @@+{-# OPTIONS_GHC -fdefer-type-errors #-}+------------------------------------------------------------------------------+-- |+-- Module      : Main+-- Stability   : experimental+-- Portability : POSIX+--+------------------------------------------------------------------------------+module Main where++import Data.Proxy (Proxy(..))+import Safe.Length (safeLength)+import Test.Hspec+import Test.QuickCheck (property)+import Test.ShouldNotTypecheck (shouldNotTypecheck)++------------------------------------------------------------------------------+-- | Testing main+main :: IO ()+main = hspec spec++------------------------------------------------------------------------------+-- | Spec+spec :: Spec+spec = do+  describe "safeLength tests" $+           tests++tests = do+    it "length of a tuple is 1" $+        property $ safeLength (Proxy :: Proxy (Char, Char)) ('a', 'b') == 1+    it "Can't accidentally take the length of a tuple when we don't mean to" $+       shouldNotTypecheck (safeLength (Proxy :: Proxy [Char]) ('a', 'b'))+    it "Can't accidentally take the length of the wrong level of a nested list" $+       shouldNotTypecheck (safeLength (Proxy :: Proxy [[Char]]) (head [['a', 'b', 'c']] :: [Char]))+    it "Can take the length of a list." $+       property $ safeLength (Proxy :: Proxy [Char]) ['a', 'b'] == 2