2 % (c) The GRASP/AQUA Project, Glasgow University, 1992-1998
5 \section[RdrName]{@RdrName@}
12 mkRdrUnqual, mkRdrQual,
13 mkSrcUnqual, mkSrcQual,
14 mkSysUnqual, mkSysQual,
15 mkPreludeQual, qualifyRdrName,
16 dummyRdrVarName, dummyRdrTcName,
19 rdrNameModule, rdrNameOcc,
20 isRdrDataCon, isRdrTyVar, isQual, isUnqual
23 #include "HsVersions.h"
25 import OccName ( NameSpace, tcName,
28 mkSrcOccFS, mkSrcVarOcc,
31 import Module ( ModuleName,
32 mkSysModuleFS, mkSrcModuleFS
35 import Util ( thenCmp )
39 %************************************************************************
41 \subsection{The main data type}
43 %************************************************************************
46 data RdrName = RdrName Qual OccName
49 | Qual ModuleName -- The (encoded) module name
53 %************************************************************************
55 \subsection{Simple functions}
57 %************************************************************************
60 rdrNameModule :: RdrName -> ModuleName
61 rdrNameModule (RdrName (Qual m) _) = m
63 rdrNameOcc :: RdrName -> OccName
64 rdrNameOcc (RdrName _ occ) = occ
68 -- These two are the basic constructors
69 mkRdrUnqual :: OccName -> RdrName
70 mkRdrUnqual occ = RdrName Unqual occ
72 mkRdrQual :: ModuleName -> OccName -> RdrName
73 mkRdrQual mod occ = RdrName (Qual mod) occ
75 -- These two are used when parsing source files
76 -- They do encode the module and occurrence names
77 mkSrcUnqual :: NameSpace -> FAST_STRING -> RdrName
78 mkSrcUnqual sp n = RdrName Unqual (mkSrcOccFS sp n)
80 mkSrcQual :: NameSpace -> FAST_STRING -> FAST_STRING -> RdrName
81 mkSrcQual sp m n = RdrName (Qual (mkSrcModuleFS m)) (mkSrcOccFS sp n)
83 -- These two are used when parsing interface files
84 -- They do not encode the module and occurrence name
85 mkSysUnqual :: NameSpace -> FAST_STRING -> RdrName
86 mkSysUnqual sp n = RdrName Unqual (mkSysOccFS sp n)
88 mkSysQual :: NameSpace -> (FAST_STRING, FAST_STRING) -> RdrName
89 mkSysQual sp (m,n) = RdrName (Qual (mkSysModuleFS m)) (mkSysOccFS sp n)
91 mkPreludeQual :: NameSpace -> ModuleName -> FAST_STRING -> RdrName
92 mkPreludeQual sp mod n = RdrName (Qual mod) (mkSrcOccFS sp n)
94 qualifyRdrName :: ModuleName -> RdrName -> RdrName
95 qualifyRdrName mod (RdrName Unqual occ) = RdrName (Qual mod) occ
96 qualifyRdrName mod rdr_name = rdr_name
100 -- This guy is used by the reader when HsSyn has a slot for
101 -- an implicit name that's going to be filled in by
102 -- the renamer. We can't just put "error..." because
103 -- we sometimes want to print out stuff after reading but
105 dummyRdrVarName = RdrName Unqual (mkSrcVarOcc SLIT("V-DUMMY"))
106 dummyRdrTcName = RdrName Unqual (mkSrcOccFS tcName SLIT("TC-DUMMY"))
111 isRdrDataCon (RdrName _ occ) = isDataOcc occ
112 isRdrTyVar (RdrName _ occ) = isTvOcc occ
114 isUnqual (RdrName Unqual _) = True
115 isUnqual other = False
117 isQual rdr_name = not (isUnqual rdr_name)
121 %************************************************************************
123 \subsection{Instances}
125 %************************************************************************
128 instance Outputable RdrName where
129 ppr (RdrName qual occ) = pp_qual qual <> ppr occ
131 pp_qual Unqual = empty
132 pp_qual (Qual mod) = ppr mod <> dot
134 instance Eq RdrName where
135 a == b = case (a `compare` b) of { EQ -> True; _ -> False }
136 a /= b = case (a `compare` b) of { EQ -> False; _ -> True }
138 instance Ord RdrName where
139 a <= b = case (a `compare` b) of { LT -> True; EQ -> True; GT -> False }
140 a < b = case (a `compare` b) of { LT -> True; EQ -> False; GT -> False }
141 a >= b = case (a `compare` b) of { LT -> False; EQ -> True; GT -> True }
142 a > b = case (a `compare` b) of { LT -> False; EQ -> False; GT -> True }
144 compare (RdrName q1 o1) (RdrName q2 o2)
145 = (o1 `compare` o2) `thenCmp`
148 cmpQual Unqual Unqual = EQ
149 cmpQual Unqual (Qual _) = LT
150 cmpQual (Qual _) Unqual = GT
151 cmpQual (Qual m1) (Qual m2) = m1 `compare` m2