OutPat(..),
irrefutablePat, irrefutablePats,
- failureFreePat, isWildPat,
- patsAreAllCons, isConPat,
+ failureFreePat, isWildPat,
+ patsAreAllCons, isConPat,
patsAreAllLits, isLitPat,
- collectPatBinders, collectPatsBinders,
- collectSigTysFromPats
+ collectPatBinders, collectOutPatBinders, collectPatsBinders,
+ collectSigTysFromPat, collectSigTysFromPats
) where
#include "HsVersions.h"
+
-- friends:
import HsLit ( HsLit, HsOverLit )
import HsExpr ( HsExpr )
import BasicTypes ( Fixity, Boxity, tupleParens )
-- others:
+import Name ( Name )
import Var ( Id, TyVar )
import DataCon ( DataCon, dataConTyCon )
-import Name ( Name, isDataSymOcc, getOccName, NamedThing )
+import Name ( isDataSymOcc, getOccName, NamedThing )
import Maybes ( maybeToBool )
import Outputable
import TyCon ( maybeTyConSingleCon )
Fixity -- c.f. OpApp in HsExpr
(InPat name)
- | NPatIn (HsOverLit name)
+ | NPatIn HsOverLit -- Always positive
+ (Maybe Name) -- Just (Name of 'negate') for negative
+ -- patterns, Nothing otherwise
+ -- (see RnEnv.lookupSyntaxName)
| NPlusKPatIn name -- n+k pattern
- (HsOverLit name) -- It'll always be an HsIntegral, but
- -- we need those names to support -fuser-numerics
- name -- Name for "-"; this supports -fuser-numerics
- -- We don't do the same for >= because that isn't
- -- affected by -fuser-numerics
+ HsOverLit -- It'll always be an HsIntegral
+ Name -- Name of '-' (see RnEnv.lookupSyntaxName)
-- We preserve prefix negation and parenthesis for the precedence parser.
| ListPatIn [InPat name] -- syntactic list
-- must have >= 1 elements
+ | PArrPatIn [InPat name] -- syntactic parallel array
+ -- must have >= 1 elements
| TuplePatIn [InPat name] Boxity -- tuple (boxed?)
| RecPatIn name -- record
| AsPat id -- as pattern
(OutPat id)
+ | SigPat (OutPat id) -- Pattern p
+ Type -- Type, t, of the whole pattern
+ (HsExpr id (OutPat id))
+ -- Coercion function,
+ -- of type t -> typeof(p)
+
| ListPat -- Syntactic list
Type -- The type of the elements
[OutPat id]
+ | PArrPat -- Syntactic parallel array
+ Type -- The type of the elements
+ [OutPat id]
| TuplePat [OutPat id] -- Tuple
Boxity
HsLit
Type -- Type of pattern
- | NPat -- Used for *overloaded* literal patterns
+ | NPat -- Used for literal patterns where there's an equality function to call
HsLit -- The literal is retained so that
-- the desugarer can readily identify
-- equations with identical literal-patterns
- -- Always HsInt, HsRat or HsString.
+ -- Always HsInteger, HsRat or HsString.
Type -- Type of pattern, t
(HsExpr id (OutPat id)) -- Of type t -> Bool; detects match
pprInPat (AsPatIn name pat) = parens (hcat [ppr name, char '@', ppr pat])
pprInPat (ParPatIn pat) = parens (pprInPat pat)
pprInPat (ListPatIn pats) = brackets (interpp'SP pats)
+pprInPat (PArrPatIn pats) = pabrackets (interpp'SP pats)
pprInPat (TuplePatIn pats bx) = tupleParens bx (interpp'SP pats)
pprInPat (NPlusKPatIn n k _) = parens (hcat [ppr n, char '+', ppr k])
-pprInPat (NPatIn l) = ppr l
+pprInPat (NPatIn l _) = ppr l
pprInPat (ConPatIn c pats)
| null pats = ppr c
pp_rpat (v, p, _) = hsep [ppr v, char '=', ppr p]
pprInPat (TypePatIn ty) = ptext SLIT("{|") <> ppr ty <> ptext SLIT("|}")
+
+-- add parallel array brackets around a document
+--
+pabrackets :: SDoc -> SDoc
+pabrackets p = ptext SLIT("[:") <> p <> ptext SLIT(":]")
\end{code}
\begin{code}
pprOutPat (AsPat name pat)
= parens (hcat [ppr name, char '@', ppr pat])
+pprOutPat (SigPat pat ty _) = ppr pat <+> dcolon <+> ppr ty
+
pprOutPat (ConPat name ty [] [] [])
= ppr name
_ -> hsep [ppr name, interppSP tyvars, interppSP dicts, interppSP pats]
pprOutPat (ListPat ty pats) = brackets (interpp'SP pats)
+pprOutPat (PArrPat ty pats) = pabrackets (interpp'SP pats)
pprOutPat (TuplePat pats boxity) = tupleParens boxity (interpp'SP pats)
pprOutPat (RecPat con ty tvs dicts rpats)
failureFreePat (ConPat con tys _ _ pats) = only_con con && all failureFreePat pats
failureFreePat (RecPat con _ _ _ fields) = only_con con && and [ failureFreePat pat | (_,pat,_) <- fields ]
failureFreePat (ListPat _ _) = False
+failureFreePat (PArrPat _ _) = False
failureFreePat (TuplePat pats _) = all failureFreePat pats
failureFreePat (DictPat _ _) = True
failureFreePat other_pat = False -- Literals, NPat
isConPat (AsPat _ pat) = isConPat pat
isConPat (ConPat _ _ _ _ _) = True
isConPat (ListPat _ _) = True
+isConPat (PArrPat _ _) = True
isConPat (TuplePat _ _) = True
isConPat (RecPat _ _ _ _ _) = True
isConPat (DictPat ds ms) = (length ds + length ms) > 1
collectPatBinders :: InPat a -> [a]
collectPatBinders pat = collect pat []
+collectOutPatBinders :: OutPat a -> [a]
+collectOutPatBinders pat = collectOut pat []
+
collectPatsBinders :: [InPat a] -> [a]
collectPatsBinders pats = foldr collect [] pats
collect (LazyPatIn pat) bndrs = collect pat bndrs
collect (AsPatIn a pat) bndrs = a : collect pat bndrs
collect (NPlusKPatIn n _ _) bndrs = n : bndrs
-collect (NPatIn _) bndrs = bndrs
+collect (NPatIn _ _) bndrs = bndrs
collect (ConPatIn c pats) bndrs = foldr collect bndrs pats
collect (ConOpPatIn p1 c f p2) bndrs = collect p1 (collect p2 bndrs)
collect (ParPatIn pat) bndrs = collect pat bndrs
collect (ListPatIn pats) bndrs = foldr collect bndrs pats
+collect (PArrPatIn pats) bndrs = foldr collect bndrs pats
collect (TuplePatIn pats _) bndrs = foldr collect bndrs pats
collect (RecPatIn c fields) bndrs = foldr (\ (f,pat,_) bndrs -> collect pat bndrs) bndrs fields
-- Generics
collect (TypePatIn ty) bndrs = bndrs
-- assume the type variables do not need to be bound
+
+-- collect the bounds *value* variables in renamed patterns; type variables
+-- are *not* collected
+--
+collectOut (WildPat _) bndrs = bndrs
+collectOut (VarPat var) bndrs = var : bndrs
+collectOut (LazyPat pat) bndrs = collectOut pat bndrs
+collectOut (AsPat a pat) bndrs = a : collectOut pat bndrs
+collectOut (ListPat _ pats) bndrs = foldr collectOut bndrs pats
+collectOut (PArrPat _ pats) bndrs = foldr collectOut bndrs pats
+collectOut (TuplePat pats _) bndrs = foldr collectOut bndrs pats
+collectOut (ConPat _ _ _ ds pats) bndrs = ds ++ foldr collectOut bndrs pats
+collectOut (RecPat _ _ _ ds fields) bndrs = ds ++ foldr comb bndrs fields
+ where
+ comb (_, pat, _) bndrs = collectOut pat bndrs
+collectOut (LitPat _ _) bndrs = bndrs
+collectOut (NPat _ _ _) bndrs = bndrs
+collectOut (NPlusKPat n _ _ _ _) bndrs = n : bndrs
+collectOut (DictPat ids1 ids2) bndrs = ids1 ++ ids2 ++ bndrs
\end{code}
\begin{code}
collectSigTysFromPats :: [InPat name] -> [HsType name]
collectSigTysFromPats pats = foldr collect_pat [] pats
+collectSigTysFromPat :: InPat name -> [HsType name]
+collectSigTysFromPat pat = collect_pat pat []
+
collect_pat (SigPatIn pat ty) acc = collect_pat pat (ty:acc)
collect_pat WildPatIn acc = acc
collect_pat (VarPatIn var) acc = acc
collect_pat (LitPatIn _) acc = acc
collect_pat (LazyPatIn pat) acc = collect_pat pat acc
collect_pat (AsPatIn a pat) acc = collect_pat pat acc
-collect_pat (NPatIn _) acc = acc
+collect_pat (NPatIn _ _) acc = acc
collect_pat (NPlusKPatIn n _ _) acc = acc
collect_pat (ConPatIn c pats) acc = foldr collect_pat acc pats
collect_pat (ConOpPatIn p1 c f p2) acc = collect_pat p1 (collect_pat p2 acc)
collect_pat (ParPatIn pat) acc = collect_pat pat acc
collect_pat (ListPatIn pats) acc = foldr collect_pat acc pats
+collect_pat (PArrPatIn pats) acc = foldr collect_pat acc pats
collect_pat (TuplePatIn pats _) acc = foldr collect_pat acc pats
collect_pat (RecPatIn c fields) acc = foldr (\ (f,pat,_) acc -> collect_pat pat acc) acc fields
-- Generics
projects / ghc-hetmet.git / blobdiff