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 BasicTypes ( Fixity, DeprecTxt )
39 import IfaceSyn ( IfaceBinding )
41 import SrcLoc ( Located(..) )
42 import Module ( Module, ModuleName )
45 All we actually declare here is the top-level structure for a module.
49 (Maybe (Located ModuleName))-- Nothing => "module X where" is omitted
50 -- (in which case the next field is Nothing too)
51 (Maybe [LIE name]) -- Export list; Nothing => export list omitted, so export everything
52 -- Just [] => export *nothing*
53 -- Just [...] => as you would expect...
54 [LImportDecl name] -- We snaffle interesting stuff out of the
55 -- imported interfaces early on, adding that
56 -- info to TyDecls/etc; so this list is
57 -- often empty, downstream.
58 [LHsDecl name] -- Type, class, value, and interface signature decls
59 (Maybe DeprecTxt) -- reason/explanation for deprecation of this module
61 data HsExtCore name -- Read from Foo.hcr
64 [TyClDecl name] -- Type declarations only; just as in Haskell source,
65 -- so that we can infer kinds etc
66 [IfaceBinding] -- And the bindings
70 instance (OutputableBndr name)
71 => Outputable (HsModule name) where
73 ppr (HsModule Nothing _ imports decls _)
74 = pp_nonnull imports $$ pp_nonnull decls
76 ppr (HsModule (Just name) exports imports decls deprec)
79 Nothing -> pp_header (ptext SLIT("where"))
82 nest 8 (fsep (punctuate comma (map ppr es))),
83 nest 4 (ptext SLIT(") where"))
89 pp_header rest = case deprec of
90 Nothing -> pp_modname <+> rest
91 Just d -> vcat [ pp_modname, ppr d, rest ]
93 pp_modname = ptext SLIT("module") <+> ppr name
96 pp_nonnull xs = vcat (map ppr xs)