libghc-chasingbottoms-dev 1.3.1.3-1build1 / var / lib / ghc / package.conf.d / ChasingBottoms-1.3.1.3.conf

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name: ChasingBottoms
version: 1.3.1.3
id: ChasingBottoms-1.3.1.3-7pnxiz6kP4fLSA8egRpZ0i
key: ChasingBottoms-1.3.1.3-7pnxiz6kP4fLSA8egRpZ0i
license: MIT
copyright: Copyright (c) Nils Anders Danielsson 2004-2017.
maintainer: http://www.cse.chalmers.se/~nad/
synopsis: For testing partial and infinite values.
description:
    Do you ever feel the need to test code involving bottoms (e.g. calls to
    the @error@ function), or code involving infinite values? Then this
    library could be useful for you.
    .
    It is usually easy to get a grip on bottoms by showing a value and
    waiting to see how much gets printed before the first exception is
    encountered. However, that quickly gets tiresome and is hard to automate
    using e.g. QuickCheck
    (<http://www.cse.chalmers.se/~rjmh/QuickCheck/>). With this library you
    can do the tests as simply as the following examples show.
    .
    Testing explicitly for bottoms:
    .
    > > isBottom (head [])
    > True
    .
    > > isBottom bottom
    > True
    .
    > > isBottom (\_ -> bottom)
    > False
    .
    > > isBottom (bottom, bottom)
    > False
    .
    Comparing finite, partial values:
    .
    > > ((bottom, 3) :: (Bool, Int)) ==! (bottom, 2+5-4)
    > True
    .
    > > ((bottom, bottom) :: (Bool, Int)) <! (bottom, 8)
    > True
    .
    Showing partial and infinite values (@\\\/!@ is join and @\/\\!@ is meet):
    .
    > > approxShow 4 $ (True, bottom) \/! (bottom, 'b')
    > "Just (True, 'b')"
    .
    > > approxShow 4 $ (True, bottom) /\! (bottom, 'b')
    > "(_|_, _|_)"
    .
    > > approxShow 4 $ ([1..] :: [Int])
    > "[1, 2, 3, _"
    .
    > > approxShow 4 $ (cycle [bottom] :: [Bool])
    > "[_|_, _|_, _|_, _"
    .
    Approximately comparing infinite, partial values:
    .
    > > approx 100 [2,4..] ==! approx 100 (filter even [1..] :: [Int])
    > True
    .
    > > approx 100 [2,4..] /=! approx 100 (filter even [bottom..] :: [Int])
    > True
    .
    The code above relies on the fact that @bottom@, just as @error
    \"...\"@, @undefined@ and pattern match failures, yield
    exceptions. Sometimes we are dealing with properly non-terminating
    computations, such as the following example, and then it can be nice to
    be able to apply a time-out:
    .
    > > timeOut' 1 (reverse [1..5])
    > Value [5,4,3,2,1]
    .
    > > timeOut' 1 (reverse [1..])
    > NonTermination
    .
    The time-out functionality can be used to treat \"slow\" computations as
    bottoms:
    .
    @
    \> let tweak = Tweak &#x7b; approxDepth = Just 5, timeOutLimit = Just 2 &#x7d;
    \> semanticEq tweak (reverse [1..], [1..]) (bottom :: [Int], [1..] :: [Int])
    True
    @
    .
    @
    \> let tweak = noTweak &#x7b; timeOutLimit = Just 2 &#x7d;
    \> semanticJoin tweak (reverse [1..], True) ([] :: [Int], bottom)
    Just ([],True)
    @
    .
    This can of course be dangerous:
    .
    @
    \> let tweak = noTweak &#x7b; timeOutLimit = Just 0 &#x7d;
    \> semanticEq tweak (reverse [1..100000000]) (bottom :: [Integer])
    True
    @
    .
    Timeouts can also be applied to @IO@ computations:
    .
    > > let primes () = unfoldr (\(x:xs) -> Just (x, filter ((/= 0) . (`mod` x)) xs)) [2..]
    > > timeOutMicro 100 (print $ primes ())
    > [2,NonTermination
    > > timeOutMicro 10000 (print $ take 10 $ primes ())
    > [2,3,5,7,11,13,17,19,23,29]
    > Value ()
    .
    For the underlying theory and a larger example involving use of
    QuickCheck, see the article \"Chasing Bottoms, A Case Study in Program
    Verification in the Presence of Partial and Infinite Values\"
    (<http://www.cse.chalmers.se/~nad/publications/danielsson-jansson-mpc2004.html>).
    .
    The code has been tested using GHC. Most parts can probably be
    ported to other Haskell compilers, but this would require some work.
    The @TimeOut@ functions require preemptive scheduling, and most of
    the rest requires @Data.Generics@; @isBottom@ only requires
    exceptions, though.
category: Testing
author: Nils Anders Danielsson
exposed: True
exposed-modules:
    Test.ChasingBottoms Test.ChasingBottoms.Approx
    Test.ChasingBottoms.ApproxShow
    Test.ChasingBottoms.ContinuousFunctions
    Test.ChasingBottoms.IsBottom Test.ChasingBottoms.Nat
    Test.ChasingBottoms.SemanticOrd Test.ChasingBottoms.TimeOut
hidden-modules: Test.ChasingBottoms.IsType
abi: 0fc497129962c43715ace749d5f503bb
trusted: False
import-dirs: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2/ChasingBottoms-1.3.1.3-7pnxiz6kP4fLSA8egRpZ0i
library-dirs: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2/ChasingBottoms-1.3.1.3-7pnxiz6kP4fLSA8egRpZ0i
dynamic-library-dirs: /usr/lib/haskell-packages/ghc/lib/x86_64-linux-ghc-8.0.2
data-dir: /usr/share/chasingbottoms
hs-libraries: HSChasingBottoms-1.3.1.3-7pnxiz6kP4fLSA8egRpZ0i
depends:
    QuickCheck-2.9.2-LvlomhGMxrFBkX1zwiWpQu base-4.9.1.0
    containers-0.5.7.1 mtl-2.2.1-BLKBelFsPB3BoFeSWSOYj6
    random-1.1-9tceXaeYIMZ4JrKq20Egog syb-0.7-4OKdCpwGutyB1rNRmoa0ya
haddock-interfaces: /usr/lib/ghc-doc/haddock/chasingbottoms-1.3.1.3/ChasingBottoms.haddock
haddock-html: /usr/share/doc/libghc-chasingbottoms-doc/html/

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