pragmatic-show (empty) → 0.1.0.0

raw patch · 5 files changed

+1305/−0 lines, 5 filesdep +basedep +pragmatic-showdep +tastysetup-changed

Dependencies added: base, pragmatic-show, tasty, tasty-hunit, tasty-quickcheck, vector-space

Files

• LICENSE +674/−0
• Setup.hs +2/−0
• Text/Show/Pragmatic.hs +495/−0
• pragmatic-show.cabal +47/−0
• test/tasty/test.hs +87/−0

@@ -0,0 +1,674 @@+              GNU GENERAL PUBLIC LICENSE+                Version 3, 29 June 2007++ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++                     Preamble++  The GNU General Public License is a free, copyleft license for+software and other kinds of works.++  The licenses for most software and other practical works are designed+to take away your freedom to share and change the works.  By contrast,+the GNU General Public License is intended to guarantee your freedom to+share and change all versions of a program--to make sure it remains free+software for all its users.  We, the Free Software Foundation, use the+GNU General Public License for most of our software; it applies also to+any other work released this way by its authors.  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Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library.  If this is what you want to do, use the GNU Lesser General+Public License instead of this License.  But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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

@@ -0,0 +1,495 @@+-- |+-- Module      : Text.Show.Pragmatic+-- Copyright   : (c) Justus Sagemüller 2017+-- License     : GPL v3+-- +-- Maintainer  : (@) jsagemue $ uni-koeln.de+-- Stability   : experimental+-- Portability : portable+-- ++{-# LANGUAGE CPP #-}++module Text.Show.Pragmatic where++import Prelude hiding (Show(..), shows)+import qualified Prelude++import Data.Int (Int8, Int16, Int32, Int64)+import Data.Word (Word8, Word16, Word32, Word64)+#if MIN_VERSION_base(4,8,0)+import Numeric.Natural (Natural)+#endif+#if MIN_VERSION_base(4,10,0)+import Type.Reflection (TyCon, SomeTypeRep, Module)+#endif+#if MIN_VERSION_base(4,9,0)+import GHC.Stack (SrcLoc, CallStack)+#endif+#if MIN_VERSION_base(3,0,0)+import Control.Exception.Base ( SomeException, ArithException, ErrorCall, IOException+                              , MaskingState+                              , ArrayException, AsyncException+#if MIN_VERSION_base(4,7,0)+                              , SomeAsyncException+#endif+                              , AssertionFailed+#if MIN_VERSION_base(4,10,0)+                              , CompactionFailed+#endif+#if MIN_VERSION_base(4,7,1)+                              , AllocationLimitExceeded+#endif+                              , Deadlock, BlockedIndefinitelyOnSTM+                              , BlockedIndefinitelyOnMVar+                              , NestedAtomically, NonTermination+#if MIN_VERSION_base(4,9,0)+                              , TypeError+#endif+                              , NoMethodError+                              , RecUpdError, RecConError, RecSelError, PatternMatchFail+                              )+#endif+import Data.Char (GeneralCategory)+import Text.Read.Lex (Number, Lexeme)+#if MIN_VERSION_base(4,7,0)+import GHC.Fingerprint.Type (Fingerprint)+#endif+import System.IO (IOMode)+import System.IO.Error (IOErrorType)+import System.Exit (ExitCode)+import Foreign.Ptr (IntPtr, WordPtr)+import Foreign.C.Types ( CUIntMax, CIntMax, CUIntPtr, CIntPtr+                       , CSUSeconds, CUSeconds, CTime, CClock+                       , CSigAtomic, CWchar, CSize, CPtrdiff+                       , CDouble, CFloat+#if MIN_VERSION_base(4,10,0)+                       , CBool+#endif+                       , CULLong, CLLong, CULong, CLong, CUInt, CInt, CUShort, CShort+                       , CUChar, CSChar, CChar+                       )+#if MIN_VERSION_base(4,10,0)+import GHC.TypeNats (SomeNat)+import GHC.TypeLits (SomeSymbol)+#endif+#if MIN_VERSION_base(4,9,0)+import GHC.Generics ( DecidedStrictness, SourceStrictness, SourceUnpackedness+                    , Associativity, Fixity )+#endif+import Data.Monoid (Any, All)+#if MIN_VERSION_base(4,4,0)+import GHC.IO.Encoding.Types (CodingProgress, TextEncoding)+import GHC.IO.Encoding.Failure (CodingFailureMode)+#endif+import GHC.IO.Device (SeekMode)+import GHC.IO.Handle (NewlineMode, Newline, BufferMode, Handle, HandlePosn)+#if MIN_VERSION_base(4,10,0)+import GHC.IO.Handle.Lock (FileLockingNotSupported)+#endif+#if MIN_VERSION_base(4,9,0)+import GHC.StaticPtr (StaticPtrInfo)+#endif+import System.Posix.Types ( Fd+#if MIN_VERSION_base(4,10,0)+                          , CTimer, CKey, CId, CFsFilCnt, CFsBlkCnt, CClockId+                          , CBlkCnt, CBlkSize+#endif+                          , CRLim, CTcflag, CSpeed, CCc, CUid+                          , CNlink, CGid, CSsize, CPid, COff, CMode, CIno, CDev )+#if MIN_VERSION_base(4,8,1)+import GHC.Event (Lifetime, Event, FdKey)+#endif+#if MIN_VERSION_base(2,1,0)+import Data.Dynamic (Dynamic)+#endif+import GHC.Conc (ThreadStatus, BlockReason)+import Control.Concurrent (ThreadId)+#if MIN_VERSION_base(4,8,0)+import Data.Version (Version)+#endif+#if MIN_VERSION_base(4,5,0)+import Data.Version (Version)+#endif+#if MIN_VERSION_base(4,9,0)+import GHC.Stats (RTSStats)+import GHC.RTS.Flags ( RTSFlags, ParFlags, TickyFlags, TraceFlags, DoTrace, ProfFlags+                     , DoHeapProfile, CCFlags, DoCostCentres, DebugFlags, MiscFlags+                     , ConcFlags, GCFlags, GiveGCStats )+#endif+import Data.Data ( Fixity, ConstrRep, DataRep+#if MIN_VERSION_base(4,0,0)+                 , Constr+#endif+                 , DataType )+#if MIN_VERSION_base(4,8,0)+import Data.Void+#endif++++-- | A drop-in replacement for 'Prelude.Show'. The behaviour is mostly the same:+--   the result of 'show' should be valid Haskell code, and 'read'ing back such a+--   value should give the original value – but, unlike in 'Prelude.Show', we don't+--   require this in an /exact/ sense, i.e. @'read' ('show' x) == x@ is not necessarily+--   fulfilled.+--   +--   Notably for floating-point values, we allow a slight deviation if+--   it considerable space in the shown representation: for example,+--   @0.90000004 :: Float@, which can easily come up as+--   the result of a computation which should in principle be exactly @0.9@, is shown+--   as @0.9@ instead. We do however /not/ commit to any particular fixed precision;+--   it depends on the type and the order of magnitude which amount of rounding is+--   appropriate. See <https://github.com/leftaroundabout/pragmatic-show/blob/master/test/tasty/test.hs the test suite> for some examples.+class Show a where+  {-# MINIMAL showsPrec | show #-}+  showsPrec :: Int -> a -> ShowS+  showsPrec _ x = (show x++)+  show :: a -> String+  show = (`shows`"")+  showList :: [a] -> ShowS+  showList [] = ("[]"++)+  showList (x:xs) = ('[':) . shows x . flip (foldr (\y -> (',':) . shows y)) xs . (']':)++shows :: Show a => a -> ShowS+shows = showsPrec 0++#define StdShow(A)             \+instance Show (A) where {       \+  show = Prelude.show;           \+  showsPrec = Prelude.showsPrec;  \+  showList = Prelude.showList }++StdShow (Bool)+StdShow (Int)+StdShow (Int8)+StdShow (Int16)+StdShow (Int32)+StdShow (Int64)+StdShow (Integer)++#if MIN_VERSION_base(4,8,0)+StdShow (Natural)+#endif++StdShow (Ordering)+StdShow (Word)+StdShow (Word8)+StdShow (Word16)+StdShow (Word32)+StdShow (Word64)++#if MIN_VERSION_base(4,9,0)+StdShow (CallStack)+#endif++#if MIN_VERSION_base(4,10,0)+StdShow (SomeTypeRep)+#endif++StdShow (())++#if MIN_VERSION_base(4,10,0)+StdShow (TyCon)+#endif++#if MIN_VERSION_base(4,9,0)+StdShow (Module)+#endif++#if MIN_VERSION_base(4,9,0)+StdShow (SrcLoc)+#endif++#if MIN_VERSION_base(3,0,0)+StdShow (SomeException)+#endif++StdShow (GeneralCategory)+StdShow (Number)+StdShow (Lexeme)++#if MIN_VERSION_base(4,7,0)+StdShow (Fingerprint)+#endif++StdShow (IOMode)+StdShow (IntPtr)+StdShow (WordPtr)+StdShow (CUIntMax)+StdShow (CIntMax)+StdShow (CUIntPtr)+StdShow (CIntPtr)+StdShow (CSUSeconds)+StdShow (CUSeconds)+StdShow (CTime)+StdShow (CClock)+StdShow (CSigAtomic)+StdShow (CWchar)+StdShow (CSize)+StdShow (CPtrdiff)++#if MIN_VERSION_base(4,10,0)+StdShow (CBool)+#endif++StdShow (CULLong)+StdShow (CLLong)+StdShow (CULong)+StdShow (CLong)+StdShow (CUInt)+StdShow (CInt)+StdShow (CUShort)+StdShow (CShort)+StdShow (CUChar)+StdShow (CSChar)+StdShow (CChar)++#if MIN_VERSION_base(4,10,0)+StdShow (SomeNat)+StdShow (SomeSymbol)+#endif++#if MIN_VERSION_base(4,9,0)+StdShow (DecidedStrictness)+StdShow (SourceStrictness)+StdShow (SourceUnpackedness)+StdShow (Associativity)+StdShow (GHC.Generics.Fixity)+#endif++StdShow (Any)+StdShow (All)++#if MIN_VERSION_base(4,0,0)+StdShow (ArithException)+StdShow (ErrorCall)+#endif++#if MIN_VERSION_base(4,1,0)+StdShow (IOException)+#endif++StdShow (MaskingState)++#if MIN_VERSION_base(4,4,0)+StdShow (CodingProgress)+#endif++#if MIN_VERSION_base(4,3,0)+StdShow (TextEncoding)+#endif++StdShow (SeekMode)+StdShow (NewlineMode)+StdShow (Newline)+StdShow (BufferMode)++#if MIN_VERSION_base(4,1,0)+StdShow (Handle)+StdShow (IOErrorType)+#endif++StdShow (ExitCode)++#if MIN_VERSION_base(4,1,0)+StdShow (ArrayException)+StdShow (AsyncException)+#endif++#if MIN_VERSION_base(4,7,0)+StdShow (SomeAsyncException)+#endif++#if MIN_VERSION_base(4,1,0)+StdShow (AssertionFailed)+#endif++#if MIN_VERSION_base(4,10,0)+StdShow (CompactionFailed)+#endif++#if MIN_VERSION_base(4,7,1)+StdShow (AllocationLimitExceeded)+#endif++#if MIN_VERSION_base(4,1,0)+StdShow (Deadlock)+StdShow (BlockedIndefinitelyOnSTM)+StdShow (BlockedIndefinitelyOnMVar)+StdShow (CodingFailureMode)+#endif++StdShow (Fd)++#if MIN_VERSION_base(4,10,0)+StdShow (CTimer)+StdShow (CKey)+StdShow (CId)+StdShow (CFsFilCnt)+StdShow (CFsBlkCnt)+StdShow (CClockId)+StdShow (CBlkCnt)+StdShow (CBlkSize)+#endif+StdShow (CRLim)+StdShow (CTcflag)+StdShow (CSpeed)+StdShow (CCc)+StdShow (CUid)+StdShow (CNlink)+StdShow (CGid)+StdShow (CSsize)+StdShow (CPid)+StdShow (COff)+StdShow (CMode)+StdShow (CIno)+StdShow (CDev)++#if MIN_VERSION_base(4,8,1)+StdShow (Lifetime)+StdShow (Event)+#endif++#if MIN_VERSION_base(2,1,0)+StdShow (Dynamic)+#endif++StdShow (ThreadStatus)+StdShow (BlockReason)++#if MIN_VERSION_base(4,2,0)+StdShow (ThreadId)+#endif++#if MIN_VERSION_base(4,0,0)+StdShow (NestedAtomically)+StdShow (NonTermination)+#endif++#if MIN_VERSION_base(4,9,0)+StdShow (TypeError)+#endif++#if MIN_VERSION_base(4,0,0)+StdShow (NoMethodError)+StdShow (RecUpdError)+StdShow (RecConError)+StdShow (RecSelError)+StdShow (PatternMatchFail)+#endif++StdShow (FdKey)+#if MIN_VERSION_base(4,10,0)+StdShow (FileLockingNotSupported)+#endif++#if MIN_VERSION_base(4,1,0)+StdShow (HandlePosn)+#endif++#if MIN_VERSION_base(4,8,0)+StdShow (Version)+#endif++#if MIN_VERSION_base(4,9,0)+StdShow (RTSStats)+StdShow (RTSFlags)+StdShow (ParFlags)+StdShow (TickyFlags)+StdShow (TraceFlags)+StdShow (DoTrace)+StdShow (ProfFlags)+StdShow (DoHeapProfile)+StdShow (CCFlags)+StdShow (DoCostCentres)+StdShow (DebugFlags)+StdShow (MiscFlags)+StdShow (ConcFlags)+StdShow (GCFlags)+StdShow (GiveGCStats)+#endif++StdShow (Data.Data.Fixity)+StdShow (ConstrRep)+StdShow (DataRep)++#if MIN_VERSION_base(4,0,0)+StdShow (Constr)+#endif++StdShow (DataType)++#if MIN_VERSION_base(4,9,0)+StdShow (StaticPtrInfo)+#endif++#if MIN_VERSION_base(4,8,0)+StdShow (Void)+#endif+++instance Show Char where+  show c | c>'\31', c/='\'', c/='\\'+                      = '\'':c:"'"+         | otherwise  = Prelude.show c+  showList cs = ('"':) . flip (foldr showc) cs . ('"':)+   where showc '"' = ("\\\""++)+         showc '\\' = ("\\\\"++)+         showc '\SO' = ("\\SO\\&"++)  -- prevent problem with "\SO\&H"≈[14,72] getting+                                      -- shown as "\SOH"≈[2]. (Thanks, QuickCheck!)+         showc c | c>'\31'    = (c:)+                 | otherwise  = case show c of+                     ('\'':q) -> case break (=='\'') q of+                       (r,"'") -> (r++)+++instance Show Float where+  showsPrec = ltdPrecShowsPrec 7++instance Show Double where+  showsPrec = ltdPrecShowsPrec 10++instance Show CFloat where+  showsPrec = ltdPrecShowsPrec 5++instance Show CDouble where+  showsPrec = ltdPrecShowsPrec 10++-- | @'ltdPrecShowsPrec' prcn@ displays floating-point values with a precision+--   of at least @prcn@ digits. That does not mean it will necessarily display+--   that many digits, rather it tries to always choose the shortest representation+--   with the required precision.+ltdPrecShowsPrec :: (RealFloat n) => Int -> Int -> n -> ShowS+ltdPrecShowsPrec _ _ 0 = ("0"++)+ltdPrecShowsPrec precision p n+    | not (n==n)  = ("NaN"++)+    | n<0         = showParen (p>5) $ ('-':) . ltdPrecShowsPrec precision 0 (negate n)+    | n==n*2      = ("Infinity"++)+    | e₁₀<7 && lrDigs <= e₁₀+                  = (rDigits++) . (replicate (e₁₀-lrDigs) '0' ++)+    | e₁₀>0 && e₁₀<3+                  = (take e₁₀ rDigits++) . ('.':) . (drop e₁₀ rDigits++)+    | e₁₀> -2 && e₁₀<=0+                  = ("0."++) . (replicate (negate e₁₀) '0'++) . (rDigits++)+    | [hd] <- rDigits+                  = (hd:) . ("e"++) . shows (e₁₀-1)+    | (hd:qd@(_:_)) <- rDigits+                  = (hd:) . ('.':) . (qd++) . ("e"++) . shows (e₁₀-1)+   where e₁₀ = ceiling $ logBase 10 n+         m₁₀Approx = round $ n * 10^^(precision+2 - e₁₀) :: Int+         (rApprZeroes, rDigits') = break (>'0') . reverse $ show m₁₀Approx+         rDigits = reverse rDigits'+         lrDigs = length rDigits++instance (Show a) => Show [a] where+  showsPrec _ = showList++instance (Show a, Show b) => Show (a,b) where+  showsPrec _ (a,b) = ('(':) . shows a . (',':) . shows b . (')':)+instance (Show a, Show b, Show c) => Show (a,b,c) where+  showsPrec _ (a,b,c) = ('(':) . shows a . (',':) . shows b . (',':) . shows c . (')':)+instance (Show a, Show b, Show c, Show d) => Show (a,b,c,d) where+  showsPrec _ (a,b,c,d) = ('(':)+           . shows a . (',':) . shows b . (',':) . shows c . (',':) . shows d+                        . (')':)

@@ -0,0 +1,47 @@+-- Initial number-show.cabal generated by cabal init.  For further +-- documentation, see http://haskell.org/cabal/users-guide/++name:                pragmatic-show+version:             0.1.0.0+synopsis:            Alternative Show class that gives shorter view if possible.+description:         The standard 'Show' class is handy for quickly viewing any Haskell+                     values without having to think about formatting. However, it often+                     produces needlessly clunky string representations, which are difficult+                     to parse by eye. This package offers a drop-in replacement which+                     attempts to keep the representation as short as possible.+license:             GPL-3+license-file:        LICENSE+author:              Justus Sagemüller+homepage:            https://github.com/leftaroundabout/number-show+maintainer:          (@) jsagemue $ uni-koeln.de+-- copyright:           +category:            Text+build-type:          Simple+-- extra-source-files:  +cabal-version:       >=1.10++library+  exposed-modules:     Text.Show.Pragmatic+  -- other-modules:       +  other-extensions:    FlexibleInstances+  build-depends:       base >=4.8 && <5+  -- hs-source-dirs:      +  default-language:    Haskell2010++test-suite test+  default-language:+    Haskell2010+  type:+    exitcode-stdio-1.0+  hs-source-dirs:+    test/tasty+  main-is:+    test.hs+  build-depends:+      base >= 4 && < 5+    , tasty >= 0.7+    , tasty-hunit+    , tasty-quickcheck+    , vector-space+    , pragmatic-show+

@@ -0,0 +1,87 @@+-- |+-- Module      : Main+-- Copyright   : (c) Justus Sagemüller 2017+-- License     : GPL v3+-- +-- Maintainer  : (@) sagemueller $ geo.uni-koeln.de+-- Stability   : experimental+-- Portability : portable+-- +{-# LANGUAGE FlexibleContexts       #-}++module Main where++import Test.Tasty+import Test.Tasty.HUnit+import qualified Test.Tasty.QuickCheck as QC+import Test.Tasty.QuickCheck ((==>), testProperty)++import qualified Prelude+import Prelude hiding (Show(..))+import Text.Show.Pragmatic++import Data.VectorSpace+++main = defaultMain tests++tests :: TestTree+tests = testGroup "Tests"+  [ testGroup "Re-Reading of exact types"+   [ testProperty "Char" $ readBackEq ([]::[Char])+   , testProperty "Int" $ readBackEq ([]::[Int])+   , testProperty "[[Int]]" $ readBackEq ([]::[ [[Int]] ])+   , testProperty "String" $ readBackEq ([]::[String])+   , testProperty "String vs standard instance"+      . QC.expectFailure -- we don't escape non-ASCII Unicode chars, unlike 'Prelude.show'.+       $ \s -> show s == Prelude.show (s :: String)+   , testProperty "(Int,Integer)" $ readBackEq ([]::[(Int,Integer)])+   , testProperty "(Int,Integer,(Char,[Int]),String)"+         $ readBackEq ([]::[(Int,Integer,(Char,[Int]),String)])+   ]+  , testGroup "Showing double-precision floats"+   [ floatTest pi "3.14159265359"+   , floatTest 32 "32"+   , floatTest (89.524 - 9.004) "80.52"+   , floatTest (0.3 + 0.3 + 0.3) "0.9"+   , testCase "FP-errors visible in standard instance" $ Prelude.show+               (0.3 + 0.3 + 0.3)@?="0.8999999999999999"+   , floatTest 325124 "325124"+   , floatTest 325124.512 "3.25124512e5"+   , floatTest 1.52464e8 "1.52464e8"+   , floatTest (1.52464e8 + 1) "1.52464001e8"+   , floatTest (1.52464e8 + 1e-5) "1.52464e8"+   , floatTest 1e-48 "1e-48"+   , floatTest (1 - 1.52464e8) "-1.52463999e8"+   , floatTest 7e35 "7e35"+   , floatTest (1/0) "Infinity"+   , floatTest (sqrt $ -1) "NaN"+   ]+  , testGroup "Re-Reading of approximate types"+   [ testProperty "Double" $ readBackApproxEq ([]::[Double]) 1e-10+   , testProperty "Double with higher-than-supported precision"+          . QC.expectFailure+           $ readBackApproxEq ([]::[Double]) 1e-14+   , testProperty "Double²" $ readBackApproxEq ([]::[(Double,Double)]) 1e-10+   , testProperty "Float" $ readBackApproxEq ([]::[Float]) 1e-5+   ]+  ]++-- | Check that showing and reading again yields the original value.+readBackEq :: (Show a, Read a, Eq a) => p a -> a -> Bool+readBackEq _ x = read (show x) == x++-- | Check that showing and reading again yields a value close to the original,+--   and that read.show is a projection (i.e. will only perhaps round once, but+--   if performed again not change anything further).+readBackApproxEq :: (Show a, Read a, InnerSpace a, RealFloat (Scalar a))+                       => p a -> Scalar a -> a -> Bool+readBackApproxEq _ ε x+  | m < 1e50   = magnitude (rs x ^-^ x) <= m*ε+                  && magnitude (rs (rs x) ^-^ rs x) == 0+  | otherwise  = True+ where m = magnitude x+       rs = read . show++floatTest :: Double -> String -> TestTree+floatTest n s = testCase s $ show n @?= s