1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
|
%
% (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
%
\section[HsImpExp]{Abstract syntax: imports, exports, interfaces}
\begin{code}
module HsImpExp where
#include "HsVersions.h"
import Module ( Module )
import Outputable
import FastString
import SrcLoc ( Located(..) )
import Char ( isAlpha )
\end{code}
%************************************************************************
%* *
\subsection{Import and export declaration lists}
%* *
%************************************************************************
One per \tr{import} declaration in a module.
\begin{code}
type LImportDecl name = Located (ImportDecl name)
data ImportDecl name
= ImportDecl (Located Module) -- module name
Bool -- True <=> {-# SOURCE #-} import
Bool -- True => qualified
(Maybe Module) -- as Module
(Maybe (Bool, [LIE name])) -- (True => hiding, names)
\end{code}
\begin{code}
instance (Outputable name) => Outputable (ImportDecl name) where
ppr (ImportDecl mod from qual as spec)
= hang (hsep [ptext SLIT("import"), ppr_imp from,
pp_qual qual, ppr mod, pp_as as])
4 (pp_spec spec)
where
pp_qual False = empty
pp_qual True = ptext SLIT("qualified")
pp_as Nothing = empty
pp_as (Just a) = ptext SLIT("as ") <+> ppr a
ppr_imp True = ptext SLIT("{-# SOURCE #-}")
ppr_imp False = empty
pp_spec Nothing = empty
pp_spec (Just (False, spec))
= parens (interpp'SP spec)
pp_spec (Just (True, spec))
= ptext SLIT("hiding") <+> parens (interpp'SP spec)
ideclName (ImportDecl mod_nm _ _ _ _) = mod_nm
\end{code}
%************************************************************************
%* *
\subsection{Imported and exported entities}
%* *
%************************************************************************
\begin{code}
type LIE name = Located (IE name)
data IE name
= IEVar name
| IEThingAbs name -- Class/Type (can't tell)
| IEThingAll name -- Class/Type plus all methods/constructors
| IEThingWith name [name] -- Class/Type plus some methods/constructors
| IEModuleContents Module -- (Export Only)
\end{code}
\begin{code}
ieName :: IE name -> name
ieName (IEVar n) = n
ieName (IEThingAbs n) = n
ieName (IEThingWith n _) = n
ieName (IEThingAll n) = n
ieNames :: IE a -> [a]
ieNames (IEVar n ) = [n]
ieNames (IEThingAbs n ) = [n]
ieNames (IEThingAll n ) = [n]
ieNames (IEThingWith n ns) = n:ns
ieNames (IEModuleContents _ ) = []
\end{code}
\begin{code}
instance (Outputable name) => Outputable (IE name) where
ppr (IEVar var) = pprHsVar var
ppr (IEThingAbs thing) = ppr thing
ppr (IEThingAll thing) = hcat [ppr thing, text "(..)"]
ppr (IEThingWith thing withs)
= ppr thing <> parens (fsep (punctuate comma (map pprHsVar withs)))
ppr (IEModuleContents mod)
= ptext SLIT("module") <+> ppr mod
\end{code}
\begin{code}
pprHsVar :: Outputable name => name -> SDoc
pprHsVar v | isOperator ppr_v = parens ppr_v
| otherwise = ppr_v
where
ppr_v = ppr v
isOperator :: SDoc -> Bool
isOperator ppr_v
= case showSDocUnqual ppr_v of
('(':s) -> False -- (), (,) etc
('[':s) -> False -- []
('$':c:s) -> not (isAlpha c) -- Don't treat $d as an operator
(':':c:s) -> not (isAlpha c) -- Don't treat :T as an operator
('_':s) -> False -- Not an operator
(c:s) -> not (isAlpha c) -- Starts with non-alpha
other -> False
-- We use (showSDoc (ppr v)), rather than isSymOcc (getOccName v) simply so
-- that we don't need NamedThing in the context of all these functions.
-- Gruesome, but simple.
\end{code}
|
