forms of ``output.''
\begin{code}
+{-# OPTIONS -w #-}
+-- The above warning supression flag is a temporary kludge.
+-- While working on this module you are encouraged to remove it and fix
+-- any warnings in the module. See
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
+-- for details
module Outputable (
Outputable(..), OutputableBndr(..), -- Class
hang, punctuate,
speakNth, speakNTimes, speakN, speakNOf, plural,
- printSDoc, printErrs, printDump,
+ printSDoc, printErrs, hPrintDump, printDump,
printForC, printForAsm, printForUser,
pprCode, mkCodeStyle,
showSDoc, showSDocForUser, showSDocDebug, showSDocDump,
hFlush stderr
printDump :: SDoc -> IO ()
-printDump doc = do
- Pretty.printDoc PageMode stdout (better_doc defaultDumpStyle)
- hFlush stdout
+printDump doc = hPrintDump stdout doc
+
+hPrintDump :: Handle -> SDoc -> IO ()
+hPrintDump h doc = do
+ Pretty.printDoc PageMode h (better_doc defaultDumpStyle)
+ hFlush h
where
better_doc = doc $$ text ""
ppr Nothing = ptext SLIT("Nothing")
ppr (Just x) = ptext SLIT("Just") <+> ppr x
+instance (Outputable a, Outputable b) => Outputable (Either a b) where
+ ppr (Left x) = ptext SLIT("Left") <+> ppr x
+ ppr (Right y) = ptext SLIT("Right") <+> ppr y
+
-- ToDo: may not be used
instance (Outputable a, Outputable b, Outputable c) => Outputable (a, b, c) where
ppr (x,y,z) =