2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
4 \section{Haskell abstract syntax definition}
6 This module glues together the pieces of the Haskell abstract syntax,
7 which is declared in the various \tr{Hs*} modules. This module,
8 therefore, is almost nothing but re-exporting.
13 -- NB: don't reexport HsCore or HsPragmas;
14 -- this module tells about "real Haskell"
27 collectTopBinders, collectMonoBinders, collectLocatedMonoBinders
30 #include "HsVersions.h"
42 import BasicTypes ( Fixity, Version, NewOrData )
46 import SrcLoc ( SrcLoc )
48 import Module ( ModuleName, pprModuleName )
51 All we actually declare here is the top-level structure for a module.
53 data HsModule name pat
55 ModuleName -- module name
56 (Maybe Version) -- source interface version number
57 (Maybe [IE name]) -- export list; Nothing => export everything
58 -- Just [] => export *nothing* (???)
59 -- Just [...] => as you would expect...
60 [ImportDecl name] -- We snaffle interesting stuff out of the
61 -- imported interfaces early on, adding that
62 -- info to TyDecls/etc; so this list is
63 -- often empty, downstream.
64 [HsDecl name pat] -- Type, class, value, and interface signature decls
65 (Maybe DeprecTxt) -- reason/explanation for deprecation of this module
70 instance (Outputable name, Outputable pat)
71 => Outputable (HsModule name pat) where
73 ppr (HsModule name iface_version exports imports
77 Nothing -> pp_header (ptext SLIT("where"))
80 nest 8 (fsep (punctuate comma (map ppr es))),
81 nest 4 (ptext SLIT(") where"))
87 pp_header rest = case deprec of
88 Nothing -> pp_modname <+> rest
89 Just d -> vcat [ pp_modname, ppr d, rest ]
91 pp_modname = ptext SLIT("module") <+> pprModuleName name
94 pp_nonnull xs = vcat (map ppr xs)
98 %************************************************************************
100 \subsection{Collecting binders from @HsBinds@}
102 %************************************************************************
104 Get all the binders in some @MonoBinds@, IN THE ORDER OF APPEARANCE.
106 These functions are here, rather than in HsBinds, to avoid a loop between HsPat and HsBinds.
115 it should return @[x, y, f, a, b]@ (remember, order important).
118 collectTopBinders :: HsBinds name (InPat name) -> Bag (name,SrcLoc)
119 collectTopBinders EmptyBinds = emptyBag
120 collectTopBinders (MonoBind b _ _) = listToBag (collectLocatedMonoBinders b)
121 collectTopBinders (ThenBinds b1 b2) = collectTopBinders b1 `unionBags` collectTopBinders b2
123 collectLocatedMonoBinders :: MonoBinds name (InPat name) -> [(name,SrcLoc)]
124 collectLocatedMonoBinders binds
127 go EmptyMonoBinds acc = acc
128 go (PatMonoBind pat _ loc) acc = map (\v->(v,loc)) (collectPatBinders pat) ++ acc
129 go (FunMonoBind f _ _ loc) acc = (f,loc) : acc
130 go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)
132 collectMonoBinders :: MonoBinds name (InPat name) -> [name]
133 collectMonoBinders binds
136 go EmptyMonoBinds acc = acc
137 go (PatMonoBind pat _ loc) acc = collectPatBinders pat ++ acc
138 go (FunMonoBind f _ _ loc) acc = f : acc
139 go (AndMonoBinds bs1 bs2) acc = go bs1 (go bs2 acc)