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.
22 HsModule(..), HsExtCore(..)
25 #include "HsVersions.h"
35 import HscTypes ( DeprecTxt )
36 import BasicTypes ( Fixity, NewOrData )
40 import IfaceSyn ( IfaceBinding )
42 import SrcLoc ( Located(..), unLoc, noLoc )
43 import Module ( Module )
44 import Bag ( Bag, foldrBag )
47 All we actually declare here is the top-level structure for a module.
51 (Maybe (Located Module))-- Nothing => "module X where" is omitted
52 -- (in which case the next field is Nothing too)
53 (Maybe [LIE name]) -- Export list; Nothing => export list omitted, so export everything
54 -- Just [] => export *nothing*
55 -- Just [...] => as you would expect...
56 [LImportDecl name] -- We snaffle interesting stuff out of the
57 -- imported interfaces early on, adding that
58 -- info to TyDecls/etc; so this list is
59 -- often empty, downstream.
60 [LHsDecl name] -- Type, class, value, and interface signature decls
61 (Maybe DeprecTxt) -- reason/explanation for deprecation of this module
63 data HsExtCore name -- Read from Foo.hcr
66 [TyClDecl name] -- Type declarations only; just as in Haskell source,
67 -- so that we can infer kinds etc
68 [IfaceBinding] -- And the bindings
72 instance (OutputableBndr name)
73 => Outputable (HsModule name) where
75 ppr (HsModule Nothing _ imports decls _)
76 = pp_nonnull imports $$ pp_nonnull decls
78 ppr (HsModule (Just name) exports imports decls deprec)
81 Nothing -> pp_header (ptext SLIT("where"))
84 nest 8 (fsep (punctuate comma (map ppr es))),
85 nest 4 (ptext SLIT(") where"))
91 pp_header rest = case deprec of
92 Nothing -> pp_modname <+> rest
93 Just d -> vcat [ pp_modname, ppr d, rest ]
95 pp_modname = ptext SLIT("module") <+> ppr name
98 pp_nonnull xs = vcat (map ppr xs)