2 % (c) The AQUA Project, Glasgow University, 1996
4 \section[DsHsSyn]{Haskell abstract syntax---added things for desugarer}
7 #include "HsVersions.h"
13 import HsSyn ( OutPat(..), HsBinds(..), Bind(..), MonoBinds(..),
14 Sig, HsExpr, GRHSsAndBinds, Match, HsLit )
15 import TcHsSyn ( TypecheckedPat(..), TypecheckedBind(..),
16 TypecheckedMonoBinds(..) )
19 import PrelInfo ( mkListTy, mkTupleTy, unitTy )
23 Note: If @outPatType@ doesn't bear a strong resemblance to @coreExprType@,
24 then something is wrong.
26 outPatType :: TypecheckedPat -> Type
28 outPatType (WildPat ty) = ty
29 outPatType (VarPat var) = idType var
30 outPatType (LazyPat pat) = outPatType pat
31 outPatType (AsPat var pat) = idType var
32 outPatType (ConPat _ ty _) = ty
33 outPatType (ConOpPat _ _ _ ty) = ty
34 outPatType (ListPat ty _) = mkListTy ty
35 outPatType (TuplePat pats) = mkTupleTy (length pats) (map outPatType pats)
36 outPatType (LitPat lit ty) = ty
37 outPatType (NPat lit ty _) = ty
38 outPatType (DictPat ds ms) = case (length ds + length ms) of
40 1 -> idType (head (ds ++ ms))
41 n -> mkTupleTy n (map idType (ds ++ ms))
45 Nota bene: DsBinds relies on the fact that at least for simple
46 tuple patterns @collectTypedPatBinders@ returns the binders in
47 the same order as they appear in the tuple.
49 collectTypedBinders and collectedTypedPatBinders are the exportees.
52 collectTypedBinders :: TypecheckedBind -> [Id]
53 collectTypedBinders EmptyBind = []
54 collectTypedBinders (NonRecBind bs) = collectTypedMonoBinders bs
55 collectTypedBinders (RecBind bs) = collectTypedMonoBinders bs
57 collectTypedMonoBinders :: TypecheckedMonoBinds -> [Id]
58 collectTypedMonoBinders EmptyMonoBinds = []
59 collectTypedMonoBinders (PatMonoBind pat _ _) = collectTypedPatBinders pat
60 collectTypedMonoBinders (FunMonoBind f _ _) = [f]
61 collectTypedMonoBinders (VarMonoBind v _) = [v]
62 collectTypedMonoBinders (AndMonoBinds bs1 bs2)
63 = collectTypedMonoBinders bs1 ++ collectTypedMonoBinders bs2
65 collectTypedPatBinders :: TypecheckedPat -> [Id]
66 collectTypedPatBinders (VarPat var) = [var]
67 collectTypedPatBinders (LazyPat pat) = collectTypedPatBinders pat
68 collectTypedPatBinders (AsPat a pat) = a : collectTypedPatBinders pat
69 collectTypedPatBinders (ConPat _ _ pats) = concat (map collectTypedPatBinders pats)
70 collectTypedPatBinders (ConOpPat p1 _ p2 _) = collectTypedPatBinders p1 ++ collectTypedPatBinders p2
71 collectTypedPatBinders (ListPat t pats) = concat (map collectTypedPatBinders pats)
72 collectTypedPatBinders (TuplePat pats) = concat (map collectTypedPatBinders pats)
73 collectTypedPatBinders (DictPat ds ms) = ds ++ ms
74 collectTypedPatBinders any_other_pat = [ {-no binders-} ]