\begin{code}
module HsPat (
- Pat(..), InPat, OutPat,
+ Pat(..), InPat, OutPat, LPat,
HsConDetails(..), hsConArgs,
patsAreAllCons, isConPat, isSigPat,
patsAreAllLits, isLitPat,
collectPatBinders, collectPatsBinders,
+ collectLocatedPatBinders, collectLocatedPatsBinders,
collectSigTysFromPat, collectSigTysFromPats
) where
-- friends:
import HsLit ( HsLit(HsCharPrim), HsOverLit )
-import HsTypes ( HsType, SyntaxName, PostTcType )
+import HsTypes ( LHsType, SyntaxName, PostTcType )
import BasicTypes ( Boxity, tupleParens )
-- others:
import TysWiredIn ( nilDataCon, charDataCon, charTy )
import DataCon ( DataCon )
import Outputable
import Type ( Type )
+import SrcLoc ( Located(..), unLoc, noLoc )
\end{code}
\begin{code}
-type InPat id = Pat id -- No 'Out' constructors
-type OutPat id = Pat id -- No 'In' constructors
+type InPat id = LPat id -- No 'Out' constructors
+type OutPat id = LPat id -- No 'In' constructors
+
+type LPat id = Located (Pat id)
data Pat id
= ------------ Simple patterns ---------------
WildPat PostTcType -- Wild card
| VarPat id -- Variable
- | LazyPat (Pat id) -- Lazy pattern
- | AsPat id (Pat id) -- As pattern
- | ParPat (Pat id) -- Parenthesised pattern
+ | LazyPat (LPat id) -- Lazy pattern
+ | AsPat (Located id) (LPat id) -- As pattern
+ | ParPat (LPat id) -- Parenthesised pattern
------------ Lists, tuples, arrays ---------------
- | ListPat [Pat id] -- Syntactic list
+ | ListPat [LPat id] -- Syntactic list
PostTcType -- The type of the elements
- | TuplePat [Pat id] -- Tuple
+ | TuplePat [LPat id] -- Tuple
Boxity -- UnitPat is TuplePat []
- | PArrPat [Pat id] -- Syntactic parallel array
+ | PArrPat [LPat id] -- Syntactic parallel array
PostTcType -- The type of the elements
------------ Constructor patterns ---------------
- | ConPatIn id
- (HsConDetails id (Pat id))
+ | ConPatIn (Located id)
+ (HsConDetails id (LPat id))
| ConPatOut DataCon
- (HsConDetails id (Pat id))
+ (HsConDetails id (LPat id))
Type -- The type of the pattern
[TyVar] -- Existentially bound type variables
[id] -- Ditto dictionaries
Type -- Type of pattern, t
(HsExpr id) -- Of type t -> Bool; detects match
- | NPlusKPatIn id -- n+k pattern
+ | NPlusKPatIn (Located id) -- n+k pattern
HsOverLit -- It'll always be an HsIntegral
SyntaxName -- Name of '-' (see RnEnv.lookupSyntaxName)
- | NPlusKPatOut id
+ | NPlusKPatOut (Located id)
Integer
(HsExpr id) -- Of type t -> Bool; detects match
(HsExpr id) -- Of type t -> t; subtracts k
------------ Generics ---------------
- | TypePat (HsType id) -- Type pattern for generic definitions
+ | TypePat (LHsType id) -- Type pattern for generic definitions
-- e.g f{| a+b |} = ...
-- These show up only in class declarations,
-- and should be a top-level pattern
------------ Pattern type signatures ---------------
- | SigPatIn (Pat id) -- Pattern with a type signature
- (HsType id)
+ | SigPatIn (LPat id) -- Pattern with a type signature
+ (LHsType id)
- | SigPatOut (Pat id) -- Pattern p
+ | SigPatOut (LPat id) -- Pattern p
Type -- Type, t, of the whole pattern
(HsExpr id) -- Coercion function,
-- of type t -> typeof(p)
\begin{code}
data HsConDetails id arg
= PrefixCon [arg] -- C p1 p2 p3
- | RecCon [(id, arg)] -- C { x = p1, y = p2 }
+ | RecCon [(Located id, arg)] -- C { x = p1, y = p2 }
| InfixCon arg arg -- p1 `C` p2
hsConArgs :: HsConDetails id arg -> [arg]
pprPat (WildPat _) = char '_'
pprPat (LazyPat pat) = char '~' <> ppr pat
pprPat (AsPat name pat) = parens (hcat [ppr name, char '@', ppr pat])
-pprPat (ParPat pat) = parens (pprPat pat)
+pprPat (ParPat pat) = parens (ppr pat)
pprPat (ListPat pats _) = brackets (interpp'SP pats)
pprPat (PArrPat pats _) = pabrackets (interpp'SP pats)
\begin{code}
mkPrefixConPat :: DataCon -> [OutPat id] -> Type -> OutPat id
-- Make a vanilla Prefix constructor pattern
-mkPrefixConPat dc pats ty = ConPatOut dc (PrefixCon pats) ty [] []
+mkPrefixConPat dc pats ty = noLoc $ ConPatOut dc (PrefixCon pats) ty [] []
mkNilPat :: Type -> OutPat id
mkNilPat ty = mkPrefixConPat nilDataCon [] ty
-mkCharLitPat :: Int -> OutPat id
-mkCharLitPat c = mkPrefixConPat charDataCon [LitPat (HsCharPrim c)] charTy
+mkCharLitPat :: Char -> OutPat id
+mkCharLitPat c = mkPrefixConPat charDataCon [noLoc $ LitPat (HsCharPrim c)] charTy
\end{code}
patsAreAllCons :: [Pat id] -> Bool
patsAreAllCons pat_list = all isConPat pat_list
-isConPat (AsPat _ pat) = isConPat pat
+isConPat (AsPat _ pat) = isConPat (unLoc pat)
isConPat (ConPatIn _ _) = True
isConPat (ConPatOut _ _ _ _ _) = True
isConPat (ListPat _ _) = True
patsAreAllLits :: [Pat id] -> Bool
patsAreAllLits pat_list = all isLitPat pat_list
-isLitPat (AsPat _ pat) = isLitPat pat
+isLitPat (AsPat _ pat) = isLitPat (unLoc pat)
isLitPat (LitPat _) = True
isLitPat (NPatIn _ _) = True
isLitPat (NPatOut _ _ _) = True
are *not* collected.
\begin{code}
-collectPatBinders :: Pat a -> [a]
-collectPatBinders pat = collect pat []
+collectPatBinders :: LPat a -> [a]
+collectPatBinders pat = map unLoc (collectLocatedPatBinders pat)
+
+collectLocatedPatBinders :: LPat a -> [Located a]
+collectLocatedPatBinders pat = collectl pat []
+
+collectPatsBinders :: [LPat a] -> [a]
+collectPatsBinders pats = map unLoc (collectLocatedPatsBinders pats)
-collectPatsBinders :: [Pat a] -> [a]
-collectPatsBinders pats = foldr collect [] pats
+collectLocatedPatsBinders :: [LPat a] -> [Located a]
+collectLocatedPatsBinders pats = foldr collectl [] pats
+
+collectl (L l (VarPat var)) bndrs = L l var : bndrs
+collectl pat bndrs = collect (unLoc pat) bndrs
collect (WildPat _) bndrs = bndrs
-collect (VarPat var) bndrs = var : bndrs
-collect (LazyPat pat) bndrs = collect pat bndrs
-collect (AsPat a pat) bndrs = a : collect pat bndrs
-collect (ParPat pat) bndrs = collect pat bndrs
+collect (LazyPat pat) bndrs = collectl pat bndrs
+collect (AsPat a pat) bndrs = a : collectl pat bndrs
+collect (ParPat pat) bndrs = collectl pat bndrs
-collect (ListPat pats _) bndrs = foldr collect bndrs pats
-collect (PArrPat pats _) bndrs = foldr collect bndrs pats
-collect (TuplePat pats _) bndrs = foldr collect bndrs pats
+collect (ListPat pats _) bndrs = foldr collectl bndrs pats
+collect (PArrPat pats _) bndrs = foldr collectl bndrs pats
+collect (TuplePat pats _) bndrs = foldr collectl bndrs pats
-collect (ConPatIn c ps) bndrs = foldr collect bndrs (hsConArgs ps)
-collect (ConPatOut c ps _ _ ds) bndrs = ds ++ foldr collect bndrs (hsConArgs ps)
+collect (ConPatIn c ps) bndrs = foldr collectl bndrs (hsConArgs ps)
+collect (ConPatOut c ps _ _ ds) bndrs = map noLoc ds
+ ++ foldr collectl bndrs (hsConArgs ps)
collect (LitPat _) bndrs = bndrs
collect (NPatIn _ _) bndrs = bndrs
collect (NPlusKPatIn n _ _) bndrs = n : bndrs
collect (NPlusKPatOut n _ _ _) bndrs = n : bndrs
-collect (SigPatIn pat _) bndrs = collect pat bndrs
-collect (SigPatOut pat _ _) bndrs = collect pat bndrs
+collect (SigPatIn pat _) bndrs = collectl pat bndrs
+collect (SigPatOut pat _ _) bndrs = collectl pat bndrs
collect (TypePat ty) bndrs = bndrs
-collect (DictPat ids1 ids2) bndrs = ids1 ++ ids2 ++ bndrs
+collect (DictPat ids1 ids2) bndrs = map noLoc ids1 ++ map noLoc ids2
+ ++ bndrs
\end{code}
\begin{code}
-collectSigTysFromPats :: [InPat name] -> [HsType name]
-collectSigTysFromPats pats = foldr collect_pat [] pats
+collectSigTysFromPats :: [InPat name] -> [LHsType name]
+collectSigTysFromPats pats = foldr collect_lpat [] pats
+
+collectSigTysFromPat :: InPat name -> [LHsType name]
+collectSigTysFromPat pat = collect_lpat pat []
-collectSigTysFromPat :: InPat name -> [HsType name]
-collectSigTysFromPat pat = collect_pat pat []
+collect_lpat pat acc = collect_pat (unLoc pat) acc
-collect_pat (SigPatIn pat ty) acc = collect_pat pat (ty:acc)
+collect_pat (SigPatIn pat ty) acc = collect_lpat pat (ty:acc)
collect_pat (TypePat ty) acc = ty:acc
-collect_pat (LazyPat pat) acc = collect_pat pat acc
-collect_pat (AsPat a pat) acc = collect_pat pat acc
-collect_pat (ParPat pat) acc = collect_pat pat acc
-collect_pat (ListPat pats _) acc = foldr collect_pat acc pats
-collect_pat (PArrPat pats _) acc = foldr collect_pat acc pats
-collect_pat (TuplePat pats _) acc = foldr collect_pat acc pats
-collect_pat (ConPatIn c ps) acc = foldr collect_pat acc (hsConArgs ps)
+collect_pat (LazyPat pat) acc = collect_lpat pat acc
+collect_pat (AsPat a pat) acc = collect_lpat pat acc
+collect_pat (ParPat pat) acc = collect_lpat pat acc
+collect_pat (ListPat pats _) acc = foldr collect_lpat acc pats
+collect_pat (PArrPat pats _) acc = foldr collect_lpat acc pats
+collect_pat (TuplePat pats _) acc = foldr collect_lpat acc pats
+collect_pat (ConPatIn c ps) acc = foldr collect_lpat acc (hsConArgs ps)
collect_pat other acc = acc -- Literals, vars, wildcard
\end{code}
-
projects / ghc-hetmet.git / blobdiff