\section[ErrsUtils]{Utilities for error reporting}
\begin{code}
-#include "HsVersions.h"
-
module ErrUtils (
-
- Error(..),
- addErrLoc, addShortErrLocLine,
- dontAddErrLoc, pprBagOfErrors,
-
- TcError(..), TcWarning(..), Message(..),
- mkTcErr, arityErr
-
+ ErrMsg, WarnMsg, Message,
+ addShortErrLocLine, addShortWarnLocLine,
+ dontAddErrLoc,
+ pprBagOfErrors, pprBagOfWarnings,
+ ghcExit,
+ doIfSet, dumpIfSet
) where
-import Ubiq{-uitous-}
+#include "HsVersions.h"
-import Bag ( bagToList )
-import PprStyle ( PprStyle(..) )
-import Pretty
-import SrcLoc ( mkUnknownSrcLoc, SrcLoc{-instance-} )
+import Bag ( Bag, bagToList )
+import SrcLoc ( SrcLoc )
+import Outputable
\end{code}
\begin{code}
-type Error = PprStyle -> Pretty
+type ErrMsg = SDoc
+type WarnMsg = SDoc
+type Message = SDoc
-addErrLoc :: SrcLoc -> String -> Error -> Error
-addErrLoc locn title rest_of_err_msg sty
- = ppHang (ppBesides [ppr PprForUser locn,
- if null title then ppNil else ppStr (": " ++ title),
- ppChar ':'])
- 4 (rest_of_err_msg sty)
+addShortErrLocLine, addShortWarnLocLine :: SrcLoc -> ErrMsg -> ErrMsg
-addShortErrLocLine :: SrcLoc -> Error -> Error
-addShortErrLocLine locn rest_of_err_msg sty
- = ppHang (ppBeside (ppr PprForUser locn) (ppChar ':'))
- 4 (rest_of_err_msg sty)
+addShortErrLocLine locn rest_of_err_msg
+ = hang (ppr locn <> colon)
+ 4 rest_of_err_msg
-dontAddErrLoc :: String -> Error -> Error
-dontAddErrLoc title rest_of_err_msg sty
- = ppHang (ppBesides [ppStr title, ppChar ':'])
- 4 (rest_of_err_msg sty)
+addShortWarnLocLine locn rest_of_err_msg
+ = hang (ppr locn <> ptext SLIT(": Warning:"))
+ 4 rest_of_err_msg
-pprBagOfErrors :: PprStyle -> Bag Error -> Pretty
-pprBagOfErrors sty bag_of_errors
- = let pretties = map ( \ e -> e sty ) (bagToList bag_of_errors) in
- ppAboves (map (\ p -> ppAbove ppSP p) pretties)
-\end{code}
+dontAddErrLoc :: String -> ErrMsg -> ErrMsg
+dontAddErrLoc title rest_of_err_msg
+ = hang (hcat [text title, char ':'])
+ 4 rest_of_err_msg
-TypeChecking Errors
-~~~~~~~~~~~~~~~~~~~
-
-\begin{code}
-type Message = PprStyle -> Pretty
-type TcError = Message
-type TcWarning = Message
+pprBagOfErrors :: Bag ErrMsg -> SDoc
+pprBagOfErrors bag_of_errors
+ = vcat [space $$ p | p <- bagToList bag_of_errors]
+pprBagOfWarnings :: Bag ErrMsg -> SDoc
+pprBagOfWarnings bag_of_warns = pprBagOfErrors bag_of_warns
+\end{code}
-mkTcErr :: SrcLoc -- Where
- -> [Message] -- Context
- -> Message -- What went wrong
- -> TcError -- The complete error report
+\begin{code}
+ghcExit :: Int -> IO ()
-mkTcErr locn ctxt msg sty
- = ppHang (ppBesides [ppr PprForUser locn, ppStr ": ", msg sty])
- 4 (ppAboves [msg sty | msg <- ctxt])
+ghcExit val
+ = if val /= 0
+ then error "Compilation had errors\n"
+ else return ()
+\end{code}
+\begin{code}
+doIfSet :: Bool -> IO () -> IO ()
+doIfSet flag action | flag = action
+ | otherwise = return ()
+\end{code}
-arityErr kind name n m sty =
- ppBesides [ ppStr "`", ppr sty name, ppStr "' should have ",
- n_arguments, ppStr ", but has been given ", ppInt m, ppChar '.']
- where
- errmsg = kind ++ " has too " ++ quantity ++ " arguments"
- quantity | m < n = "few"
- | otherwise = "many"
- n_arguments | n == 0 = ppStr "no arguments"
- | n == 1 = ppStr "1 argument"
- | True = ppCat [ppInt n, ppStr "arguments"]
+\begin{code}
+dumpIfSet :: Bool -> String -> SDoc -> IO ()
+dumpIfSet flag hdr doc
+ | not flag = return ()
+ | otherwise = printDump dump
+ where
+ dump = vcat [text "",
+ line <+> text hdr <+> line,
+ doc,
+ text ""]
+ line = text (take 20 (repeat '='))
\end{code}