show (empty) → 0.1
raw patch · 6 files changed
+750/−0 lines, 6 filesdep +QuickCheckdep +basedep +randomsetup-changed
Dependencies added: QuickCheck, base, random
Files
- LICENSE +340/−0
- Setup.hs +5/−0
- ShowFun.hs +11/−0
- ShowQ.hs +112/−0
- SimpleReflect.hs +251/−0
- show.cabal +31/−0
+ LICENSE view
@@ -0,0 +1,340 @@+ GNU GENERAL PUBLIC LICENSE+ Version 2, June 1991++ Copyright (C) 1989, 1991 Free Software Foundation, Inc.+ 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA+ Everyone is permitted to copy and distribute verbatim copies+ of this license document, but changing it is not allowed.++ Preamble++ The licenses for most software are designed to take away your+freedom to share and change it. By contrast, the GNU General Public+License is intended to guarantee your freedom to share and change free+software--to make sure the software is free for all its users. This+General Public License applies to most of the Free Software+Foundation's software and to any other program whose authors commit to+using it. (Some other Free Software Foundation software is covered by+the GNU Library General Public License instead.) You can apply it to+your programs, too.++ When we speak of free software, we are referring to freedom, not+price. 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+ Setup.hs view
@@ -0,0 +1,5 @@+#!/usr/bin/runhaskell++import Distribution.Simple++main = defaultMainWithHooks simpleUserHooks
+ ShowFun.hs view
@@ -0,0 +1,11 @@+-- Helper code for runplugs that doesn't agree with SmallCheck++module ShowFun where++import Data.Typeable++instance (Typeable a, Typeable b) => Show (a -> b) where+ show e = '<' : (show . typeOf) e ++ ">"++instance Typeable a => Show (IO a) where+ show e = '<' : (show . typeOf) e ++ ">"
+ ShowQ.hs view
@@ -0,0 +1,112 @@+-- Helper code for runplugs+--+-- Note: must be kept in separate module to hide unsafePerformIO from+-- runplugs-generated eval code!! you're warned.++module ShowQ where++-- import Language.Haskell.TH+import System.IO.Unsafe+import Data.Dynamic+import Data.Ratio++import Test.QuickCheck.Batch+import Test.QuickCheck+import Data.Char+import Data.List+import Data.Word+import Data.Int+import System.Random++type T = [Int]+type I = Int++-- instance Ppr a => Show (Q a) where+-- show e = unsafePerformIO $ runQ e >>= return . pprint++instance Arbitrary Char where+ arbitrary = choose (minBound, maxBound)+ coarbitrary c = variant (ord c `rem` 4)++instance Arbitrary Word8 where+ arbitrary = choose (minBound, maxBound)+ coarbitrary c = variant (fromIntegral ((fromIntegral c) `rem` 4))++instance Arbitrary Ordering where+ arbitrary = elements [LT,EQ,GT]+ coarbitrary LT = variant 1+ coarbitrary EQ = variant 2+ coarbitrary GT = variant 0++instance Arbitrary Int64 where+ arbitrary = sized $ \n -> choose (-fromIntegral n,fromIntegral n)+ coarbitrary n = variant (fromIntegral (if n >= 0 then 2*n else 2*(-n) + 1))++instance (Integral a, Arbitrary a) => Arbitrary (Ratio a) where+ arbitrary = do a <- arbitrary+ b <- arbitrary+ return $ if b == 0+ then if a == 0+ then (1 % 1)+ else (b % a)+ else (a % b)++ coarbitrary m = variant (fromIntegral $ if n >= 0 then 2*n else 2*(-n) + 1)+ where n = numerator m++instance Random Word8 where+ randomR = integralRandomR+ random = randomR (minBound,maxBound)++instance Random Int64 where+ randomR = integralRandomR+ random = randomR (minBound,maxBound)++integralRandomR :: (Integral a, RandomGen g) => (a,a) -> g -> (a,g)+integralRandomR (a,b) g = case randomR (fromIntegral a :: Integer,+ fromIntegral b :: Integer) g of+ (x,g) -> (fromIntegral x, g)++myquickcheck :: Testable a => a -> IO String+myquickcheck a = do+ rnd <- newStdGen+ tests (evaluate a) rnd 0 0 []++tests :: Gen Result -> StdGen -> Int -> Int -> [[String]] -> IO String+tests gen rnd0 ntest nfail stamps+ | ntest == 500 = done "OK, passed" ntest stamps+ | nfail == 1000 = done "Arguments exhausted after" ntest stamps+ | otherwise = case ok result of+ Nothing -> tests gen rnd1 ntest (nfail+1) stamps+ Just True -> tests gen rnd1 (ntest+1) nfail (stamp result:stamps)+ Just False -> return $ "Falsifiable, after "+ ++ show ntest+ ++ " tests:\n"+ ++ unlines (arguments result)+ where+ result = generate (((+ 3) . (`div` 2)) ntest) rnd2 gen+ (rnd1,rnd2) = split rnd0++done :: String -> Int -> [[String]] -> IO String+done mesg ntest stamps = return $ mesg ++ " " ++ show ntest ++ " tests" ++ table+ where+ table = display+ . map entry+ . reverse+ . sort+ . map pairLength+ . group+ . sort+ . filter (not . null)+ $ stamps++ display [] = ".\n"+ display [x] = " (" ++ x ++ ").\n"+ display xs = ".\n" ++ unlines (map (++ ".") xs)++ pairLength xss@(xs:_) = (length xss, xs)+ entry (n, xs) = percentage n ntest+ ++ " "+ ++ concat (intersperse ", " xs)++ percentage n m = show ((100 * n) `div` m) ++ "%"
+ SimpleReflect.hs view
@@ -0,0 +1,251 @@+{-# LANGUAGE DeriveDataTypeable #-}+-----------------------------------------------------------------------------+-- |+-- Module : SimpleReflect+-- Copyright : (c) 2008 Twan van Laarhoven+-- License : BSD-style+--+-- Maintainer : twanvl@gmail.com+-- Stability : experimental+-- Portability : portable+--+-- Simple reflection of Haskell expressions containing variables.+--+-----------------------------------------------------------------------------+module SimpleReflect+ ( Expr+ , var, fun, expr, reduce+ , a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z+ ) where+++import Data.List+import Control.Applicative++{- -- Lennart Augustsson's extensions, temporarily disabled.+import Control.Monad.State hiding(lift)+-}++import Data.Typeable+import Data.Generics hiding (Fixity)+++------------------------------------------------------------------------------+-- Data type+------------------------------------------------------------------------------++data Expr = Expr+ { showExpr :: Int -> ShowS+ , intExpr :: Maybe Integer+ , doubleExpr :: Maybe Double+ , reduced :: Maybe Expr+ } deriving (Typeable, Data)++instance Show Expr where+ showsPrec p r = showExpr r p++-- Default expression+emptyExpr :: Expr+emptyExpr = Expr { showExpr = \_ -> showString ""+ , intExpr = Nothing+ , doubleExpr = Nothing+ , reduced = Nothing+ }++------------------------------------------------------------------------------+-- Lifting and combining expressions+------------------------------------------------------------------------------++-- | A variable+var :: String -> Expr+var s = emptyExpr { showExpr = \_ -> showString s }++lift :: Show a => a -> Expr+lift x = emptyExpr { showExpr = \p -> showsPrec p x }++data Fixity = L | R deriving Eq++-- | A operator as expression+op :: Fixity -> Int -> String -> Expr -> Expr -> Expr+op fix prec op a b = emptyExpr { showExpr = showFun }+ where showFun p = showParen (p > prec)+ $ showExpr a (if fix == L then prec else prec + 1)+ . showString op+ . showExpr b (if fix == R then prec else prec + 1)++------------------------------------------------------------------------------+-- Adding numeric results+------------------------------------------------------------------------------++iOp r f a = (r a ) { intExpr = f <$> intExpr a }+iOp2 r f a b = (r a b) { intExpr = f <$> intExpr a <*> intExpr b }+dOp r f a = (r a ) { doubleExpr = f <$> doubleExpr a }+dOp2 r f a b = (r a b) { doubleExpr = f <$> doubleExpr a <*> doubleExpr b }++withReduce r a = let rr = r a in+ rr { reduced = withReduce r <$> reduced a+ <|> fromInteger <$> intExpr rr+ <|> fromDouble <$> doubleExpr rr+ }+withReduce2 r a b = let rr = r a b in+ rr { reduced = (\a' -> withReduce2 r a' b) <$> reduced a+ <|> (\b' -> withReduce2 r a b') <$> reduced b+ <|> fromInteger <$> intExpr rr+ <|> fromDouble <$> doubleExpr rr+ }++------------------------------------------------------------------------------+-- Function types+------------------------------------------------------------------------------++class FromExpr a where+ fromExpr :: Expr -> a++instance FromExpr Expr where+ fromExpr = id++instance (Show a, FromExpr b) => FromExpr (a -> b) where+ fromExpr f a = fromExpr $ op L 10 " " f (lift a)++fun :: FromExpr a => String -> a+fun = fromExpr . var++------------------------------------------------------------------------------+-- Variables!+------------------------------------------------------------------------------++a,b,c,d,e,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z :: Expr+[a,b,c,d,e,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z]+ = [var [x] | x <- ['a'..'e']++['i'..'z']]++f,g,h :: FromExpr a => a+f = fun "f"+g = fun "g"+h = fun "h"++------------------------------------------------------------------------------+-- Forcing conversion & evaluation+------------------------------------------------------------------------------++-- | Force something to be an expression+expr :: Expr -> Expr+expr = id++-- | Reduce (evaluate) an expression once+-- for example 1 + 2 + 3 + 4 ==> 3 + 3 + 4+reduce :: Expr -> Expr+reduce e = maybe e id (reduced e)++reduction :: Expr -> [Expr]+reduction e = e : unfoldr (\e -> do e' <- reduced e; return (e',e')) e++------------------------------------------------------------------------------+-- Numeric classes+------------------------------------------------------------------------------++instance Eq Expr where+ Expr{ intExpr = Just a } == Expr{ intExpr = Just b } = a == b+ Expr{ doubleExpr = Just a } == Expr{ doubleExpr = Just b } = a == b+ a == b = show a == show b++instance Ord Expr where+ compare Expr{ intExpr = Just a } Expr{ intExpr = Just b } = compare a b+ compare Expr{ doubleExpr = Just a } Expr{ doubleExpr = Just b } = compare a b+ compare a b = compare (show a) (show b)+ min = fun "min" `iOp2` min `dOp2` min+ max = fun "max" `iOp2` max `dOp2` max++instance Num Expr where+ (+) = withReduce2 $ op L 6 " + " `iOp2` (+) `dOp2` (+)+ (-) = withReduce2 $ op L 6 " - " `iOp2` (-) `dOp2` (-)+ (*) = withReduce2 $ op L 7 " * " `iOp2` (*) `dOp2` (*)+ negate = withReduce $ fun "negate" `iOp` negate `dOp` negate+ abs = withReduce $ fun "abs" `iOp` abs `dOp` abs+ signum = withReduce $ fun "signum" `iOp` signum `dOp` signum+ fromInteger i = (lift i)+ { intExpr = Just i+ , doubleExpr = Just $ fromInteger i }++instance Real Expr where+ toRational expr = case (doubleExpr expr, intExpr expr) of+ (Just d,_) -> toRational d+ (_,Just i) -> toRational i+ _ -> error "not a number"++instance Integral Expr where+ quotRem a b = (quot a b, rem a b)+ divMod a b = (div a b, mod a b)+ quot = withReduce2 $ op L 7 " `quot` " `iOp2` quot+ rem = withReduce2 $ op L 7 " `rem` " `iOp2` rem+ div = withReduce2 $ op L 7 " `div` " `iOp2` div+ mod = withReduce2 $ op L 7 " `mod` " `iOp2` mod+ toInteger expr = case intExpr expr of+ Just i -> i+ _ -> error "not a number"++instance Fractional Expr where+ (/) = withReduce2 $ op L 7 " / " `dOp2` (/)+ recip = withReduce $ fun "recip" `dOp` recip+ fromRational r = fromDouble (fromRational r)++fromDouble d = (lift d) { doubleExpr = Just d }++instance Floating Expr where+ pi = (var "pi") { doubleExpr = Just pi }+ exp = withReduce $ fun "exp" `dOp` exp+ sqrt = withReduce $ fun "sqrt" `dOp` sqrt+ log = withReduce $ fun "log" `dOp` log+ (**) = withReduce2 $ op R 8 "**" `dOp2` (**)+ sin = withReduce $ fun "sin" `dOp` sin+ cos = withReduce $ fun "cos" `dOp` cos+ sinh = withReduce $ fun "sinh" `dOp` sinh+ cosh = withReduce $ fun "cosh" `dOp` cosh+ asin = withReduce $ fun "asin" `dOp` asin+ acos = withReduce $ fun "acos" `dOp` acos+ atan = withReduce $ fun "atan" `dOp` atan+ asinh = withReduce $ fun "asinh" `dOp` asinh+ acosh = withReduce $ fun "acosh" `dOp` acosh+ atanh = withReduce $ fun "atanh" `dOp` atanh++instance Enum Expr where+ succ = withReduce $ fun "succ" `iOp` succ `dOp` succ+ pred = withReduce $ fun "pred" `iOp` pred `dOp` pred+ toEnum = fun "toEnum"+ fromEnum = fromEnum . toInteger+ enumFrom a = map fromInteger $ enumFrom (toInteger a)+ enumFromThen a b = map fromInteger $ enumFromThen (toInteger a) (toInteger b)+ enumFromTo a c = map fromInteger $ enumFromTo (toInteger a) (toInteger c)+ enumFromThenTo a b c = map fromInteger $ enumFromThenTo (toInteger a) (toInteger b) (toInteger c)++instance Bounded Expr where+ minBound = var "minBound"+ maxBound = var "maxBound"++{- -- Lennart Augustsson's Extensions, temporarily disabled.+See <http://augustss.blogspot.com/2008/03/in-recent-blog-post-by-twan-van.html>.++instance (Show a, ExprArg a, Show r) => Show (a -> r) where+ showsPrec _ f = showString "\\ " . showsPrec 0 v . showString " -> " .+ showsPrec 0 (f v)+ where v = evalState exprArg vars+ dummy = evalState exprArg $ repeat "_"+ vars = supply \\ tokenize (show $ f dummy)+ supply = ["x","y","z"] ++ [ "x" ++ show i | i <- [1..]]+ tokenize "" = []+ tokenize s = case lex s of (x,s') : _ -> x : tokenize s'++class ExprArg a where+ exprArg :: State [String] a++instance ExprArg Expr where+ exprArg = do v:vs <- get; put vs; return (var v)++instance ExprArg () where+ exprArg = return ()++instance (ExprArg a, ExprArg b) => ExprArg (a, b) where+ exprArg = liftM2 (,) exprArg exprArg++instance (ExprArg a, ExprArg b, ExprArg c) => ExprArg (a, b, c) where+ exprArg = liftM3 (,,) exprArg exprArg exprArg+-}
+ show.cabal view
@@ -0,0 +1,31 @@+name: show+version: 0.1++license: GPL+license-file: LICENSE+author: Lambdabot devs, Twan van Laarhoven <twanvl@gmail.com>+-- maintainer: Cale++stability: Experimental+category: Language+synopsis: 'Show' instances for Lambdabot+description: This package provides ShowQ, ShowFun, and SimpleReflect.+ .+ ShowFun gives us Typeable instances for neutring IO expressions.+ .+ ShowQ adds QuickCheck support.+ .+ And SimpleReflect allows us to literally see how functions 'expand',+ through appropriate Show magic. See <http://twan.home.fmf.nl/blog/haskell/simple-reflection-of-expressions.details>.++build-type: Simple+Cabal-Version: >= 1.2+tested-with: GHC==6.8.2++library+ exposed-modules: ShowQ, ShowFun, SimpleReflect++ build-depends: base, random, QuickCheck<2++ ghc-options: -Wall+ ghc-prof-options: -prof -auto-all