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{-# LANGUAGE CPP #-}
module Test.QuickCheck.Exception where
#if !defined(__GLASGOW_HASKELL__) || (__GLASGOW_HASKELL__ < 609)
#define OLD_EXCEPTIONS
#endif
#if defined(__GLASGOW_HASKELL__) && __GLASGOW_HASKELL__ >= 607
#define GHC_INTERRUPT
#endif
#if defined OLD_EXCEPTIONS
import Control.Exception(evaluate, try, Exception(..))
#else
import Control.Exception.Extensible(evaluate, try, SomeException(SomeException)
#if defined(GHC_INTERRUPT)
, AsyncException(UserInterrupt)
#endif
)
#endif
#if defined(GHC_INTERRUPT)
import Panic(GhcException(Interrupted))
import Data.Typeable
#if defined(OLD_EXCEPTIONS)
import Data.Dynamic
#endif
#endif
#if defined(OLD_EXCEPTIONS)
type AnException = Control.Exception.Exception
#else
type AnException = SomeException
#endif
--------------------------------------------------------------------------
-- try evaluate
tryEvaluate :: a -> IO (Either AnException a)
tryEvaluate x = tryEvaluateIO (return x)
tryEvaluateIO :: IO a -> IO (Either AnException a)
tryEvaluateIO m = try (m >>= evaluate)
--tryEvaluateIO m = Right `fmap` m
-- Test if an exception was a ^C.
-- QuickCheck won't try to shrink an interrupted test case.
isInterrupt :: AnException -> Bool
#if defined(GHC_INTERRUPT)
#if defined(OLD_EXCEPTIONS)
isInterrupt (DynException e) = fromDynamic e == Just Interrupted
isInterrupt _ = False
#else
isInterrupt (SomeException e) =
cast e == Just Interrupted || cast e == Just UserInterrupt
#endif
#else /* !defined(GHC_INTERRUPT) */
isInterrupt _ = False
#endif
--------------------------------------------------------------------------
-- the end.
|
