% Author: Juan J. Quintela <quintela@krilin.dc.fi.udc.es>
\begin{code}
-{-# OPTIONS_GHC -w #-}
+{-# 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/WorkingConventions#Warnings
+-- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
-- for details
module Check ( check , ExhaustivePat ) where
| literals = split_by_literals qs
| constructors = split_by_constructor qs
| only_vars = first_column_only_vars qs
- | otherwise = pprPanic "Check.check': Not implemented :-(" (ppr first_pats)
+-- FIXME: hack to get view patterns through for now
+ | otherwise = ([([],[])],emptyUniqSet)
+-- pprPanic "Check.check': Not implemented :-(" (ppr first_pats)
where
-- Note: RecPats will have been simplified to ConPats
-- at this stage.
-- It doesn't matter which one, because they will only be compared
-- with other HsLits gotten in the same way
get_lit (LitPat lit) = Just lit
-get_lit (NPat (HsIntegral i _) mb _ _) = Just (HsIntPrim (mb_neg mb i))
-get_lit (NPat (HsFractional f _) mb _ _) = Just (HsFloatPrim (mb_neg mb f))
-get_lit (NPat (HsIsString s _) _ _ _) = Just (HsStringPrim s)
+get_lit (NPat (HsIntegral i _ _) mb _) = Just (HsIntPrim (mb_neg mb i))
+get_lit (NPat (HsFractional f _ _) mb _) = Just (HsFloatPrim (mb_neg mb f))
+get_lit (NPat (HsIsString s _ _) _ _) = Just (HsStringPrim s)
get_lit other_pat = Nothing
mb_neg :: Num a => Maybe b -> a -> a
is_lit :: Pat Id -> Bool
is_lit (LitPat _) = True
-is_lit (NPat _ _ _ _) = True
+is_lit (NPat _ _ _) = True
is_lit _ = False
is_var :: Pat Id -> Bool
has_nplusk_pat (NPlusKPat _ _ _ _) = True
has_nplusk_pat (ParPat p) = has_nplusk_lpat p
has_nplusk_pat (AsPat _ p) = has_nplusk_lpat p
+has_nplusk_pat (ViewPat _ p _) = has_nplusk_lpat p
has_nplusk_pat (SigPatOut p _ ) = has_nplusk_lpat p
has_nplusk_pat (ListPat ps _) = any has_nplusk_lpat ps
has_nplusk_pat (TuplePat ps _ _) = any has_nplusk_lpat ps
-- purposes, a ~pat is like a wildcard
simplify_pat (BangPat p) = unLoc (simplify_lpat p)
simplify_pat (AsPat id p) = unLoc (simplify_lpat p)
+
+simplify_pat (ViewPat expr p ty) = ViewPat expr (simplify_lpat p) ty
+
simplify_pat (SigPatOut p _) = unLoc (simplify_lpat p) -- I'm not sure this is right
simplify_pat pat@(ConPatOut { pat_con = L loc id, pat_args = ps })
mk_char_lit c = mkPrefixConPat charDataCon [nlLitPat (HsCharPrim c)] charTy
simplify_pat (LitPat lit) = tidyLitPat lit
-simplify_pat (NPat lit mb_neg eq lit_ty) = tidyNPat lit mb_neg eq lit_ty
+simplify_pat (NPat lit mb_neg eq) = tidyNPat lit mb_neg eq
simplify_pat (NPlusKPat id hslit hsexpr1 hsexpr2)
= WildPat (idType (unLoc id))