diff options
Diffstat (limited to 'compiler/hsSyn/HsPat.lhs')
| -rw-r--r-- | compiler/hsSyn/HsPat.lhs | 71 |
1 files changed, 33 insertions, 38 deletions
diff --git a/compiler/hsSyn/HsPat.lhs b/compiler/hsSyn/HsPat.lhs index af921de689..506537517d 100644 --- a/compiler/hsSyn/HsPat.lhs +++ b/compiler/hsSyn/HsPat.lhs @@ -19,13 +19,13 @@ module HsPat ( HsConPatDetails, hsConPatArgs, HsRecFields(..), HsRecField(..), hsRecFields, - HsQuasiQuote(..), - mkPrefixConPat, mkCharLitPat, mkNilPat, mkCoPat, mkCoPatCoI, isBangHsBind, hsPatNeedsParens, patsAreAllCons, isConPat, isSigPat, isWildPat, - patsAreAllLits, isLitPat, isIrrefutableHsPat + patsAreAllLits, isLitPat, isIrrefutableHsPat, + + pprParendLPat ) where import {-# SOURCE #-} HsExpr (SyntaxExpr, LHsExpr, pprLExpr) @@ -215,24 +215,6 @@ hsRecFields :: HsRecFields id arg -> [id] hsRecFields rbinds = map (unLoc . hsRecFieldId) (rec_flds rbinds) \end{code} -\begin{code} -data HsQuasiQuote id = HsQuasiQuote - id - id - SrcSpan - FastString - -instance OutputableBndr id => Outputable (HsQuasiQuote id) where - ppr = ppr_qq - -ppr_qq :: OutputableBndr id => HsQuasiQuote id -> SDoc -ppr_qq (HsQuasiQuote name quoter _ quote) = - char '$' <> brackets (ppr name) <> - ptext (sLit "[:") <> ppr quoter <> ptext (sLit "|") <> - ppr quote <> ptext (sLit "|]") -\end{code} - - %************************************************************************ %* * %* Printing patterns @@ -252,14 +234,30 @@ pprPatBndr var -- Print with type info if -dppr-debug is on else ppr var +pprParendLPat :: (OutputableBndr name) => LPat name -> SDoc +pprParendLPat (L _ p) = pprParendPat p + +pprParendPat :: (OutputableBndr name) => Pat name -> SDoc +pprParendPat p | patNeedsParens p = parens (pprPat p) + | otherwise = pprPat p + +patNeedsParens :: Pat name -> Bool +patNeedsParens (ConPatIn _ d) = not (null (hsConPatArgs d)) +patNeedsParens (ConPatOut { pat_args = d }) = not (null (hsConPatArgs d)) +patNeedsParens (SigPatIn {}) = True +patNeedsParens (SigPatOut {}) = True +patNeedsParens (ViewPat {}) = True +patNeedsParens (CoPat {}) = True +patNeedsParens _ = False + pprPat :: (OutputableBndr name) => Pat name -> SDoc pprPat (VarPat var) = pprPatBndr var -pprPat (VarPatOut var bs) = parens (pprPatBndr var <+> braces (ppr bs)) +pprPat (VarPatOut var bs) = pprPatBndr var <+> braces (ppr bs) pprPat (WildPat _) = char '_' -pprPat (LazyPat pat) = char '~' <> ppr pat -pprPat (BangPat pat) = char '!' <> ppr pat -pprPat (AsPat name pat) = parens (hcat [ppr name, char '@', ppr pat]) -pprPat (ViewPat expr pat _) = parens (hcat [pprLExpr expr, text " -> ", ppr pat]) +pprPat (LazyPat pat) = char '~' <> pprParendLPat pat +pprPat (BangPat pat) = char '!' <> pprParendLPat pat +pprPat (AsPat name pat) = hcat [ppr name, char '@', pprParendLPat pat] +pprPat (ViewPat expr pat _) = hcat [pprLExpr expr, text " -> ", ppr pat] pprPat (ParPat pat) = parens (ppr pat) pprPat (ListPat pats _) = brackets (interpp'SP pats) pprPat (PArrPat pats _) = pabrackets (interpp'SP pats) @@ -275,26 +273,23 @@ pprPat (ConPatOut { pat_con = con, pat_tvs = tvs, pat_dicts = dicts, pprLHsBinds binds, pprConArgs details] else pprUserCon con details -pprPat (LitPat s) = ppr s +pprPat (LitPat s) = ppr s pprPat (NPat l Nothing _) = ppr l pprPat (NPat l (Just _) _) = char '-' <> ppr l -pprPat (NPlusKPat n k _ _) = hcat [ppr n, char '+', ppr k] -pprPat (QuasiQuotePat (HsQuasiQuote name quoter _ quote)) - = char '$' <> brackets (ppr name) <> - ptext (sLit "[:") <> ppr quoter <> ptext (sLit "|") <> - ppr quote <> ptext (sLit "|]") -pprPat (TypePat ty) = ptext (sLit "{|") <> ppr ty <> ptext (sLit "|}") -pprPat (CoPat co pat _) = parens (pprHsWrapper (ppr pat) co) -pprPat (SigPatIn pat ty) = ppr pat <+> dcolon <+> ppr ty -pprPat (SigPatOut pat ty) = ppr pat <+> dcolon <+> ppr ty +pprPat (NPlusKPat n k _ _) = hcat [ppr n, char '+', ppr k] +pprPat (QuasiQuotePat qq) = ppr qq +pprPat (TypePat ty) = ptext (sLit "{|") <> ppr ty <> ptext (sLit "|}") +pprPat (CoPat co pat _) = pprHsWrapper (ppr pat) co +pprPat (SigPatIn pat ty) = ppr pat <+> dcolon <+> ppr ty +pprPat (SigPatOut pat ty) = ppr pat <+> dcolon <+> ppr ty pprUserCon :: (Outputable con, OutputableBndr id) => con -> HsConPatDetails id -> SDoc pprUserCon c (InfixCon p1 p2) = ppr p1 <+> ppr c <+> ppr p2 pprUserCon c details = ppr c <+> pprConArgs details pprConArgs :: OutputableBndr id => HsConPatDetails id -> SDoc -pprConArgs (PrefixCon pats) = interppSP pats -pprConArgs (InfixCon p1 p2) = interppSP [p1,p2] +pprConArgs (PrefixCon pats) = sep (map pprParendLPat pats) +pprConArgs (InfixCon p1 p2) = sep [pprParendLPat p1, pprParendLPat p2] pprConArgs (RecCon rpats) = ppr rpats instance (OutputableBndr id, Outputable arg) |