2 % (c) The AQUA Project, Glasgow University, 1996
4 \section[PprEnv]{The @PprEnv@ type}
7 #include "HsVersions.h"
14 pCon, pLit, pMajBndr, pMinBndr, pOcc, pPrim, pSCC, pStyle,
15 pTy, pTyVar, pUVar, pUse,
18 SYN_IE(NmbrM), initNmbr,
20 mapNmbr, mapAndUnzipNmbr
21 -- nmbr1, nmbr2, nmbr3
22 -- rnumValVar, rnumTyVar, rnumUVar,
23 -- lookupValVar, lookupTyVar, lookupUVar
28 import Pretty ( SYN_IE(Pretty) )
29 import Unique ( initRenumberingUniques )
30 import UniqFM ( emptyUFM )
34 For tyvars and uvars, we {\em do} normally use these homogenized
35 names; for values, we {\em don't}. In printing interfaces, though,
36 we use homogenized value names, so that interfaces don't wobble
37 uncontrollably from changing Unique-based names.
40 data PprEnv tyvar uvar bndr occ
41 = PE PprStyle -- stored for safe keeping
43 (Literal -> Pretty) -- Doing these this way saves
44 (Id -> Pretty) -- carrying around a PprStyle
46 (CostCentre -> Pretty)
48 (tyvar -> Pretty) -- to print tyvars
49 (uvar -> Pretty) -- to print usage vars
51 (bndr -> Pretty) -- to print "major" val_bdrs
52 (bndr -> Pretty) -- to print "minor" val_bdrs
53 (occ -> Pretty) -- to print bindees
55 (GenType tyvar uvar -> Pretty)
56 (GenUsage uvar -> Pretty)
62 -> Maybe (Literal -> Pretty)
63 -> Maybe (Id -> Pretty)
64 -> Maybe (PrimOp -> Pretty)
65 -> Maybe (CostCentre -> Pretty)
66 -> Maybe (tyvar -> Pretty)
67 -> Maybe (uvar -> Pretty)
68 -> Maybe (bndr -> Pretty)
69 -> Maybe (bndr -> Pretty)
70 -> Maybe (occ -> Pretty)
71 -> Maybe (GenType tyvar uvar -> Pretty)
72 -> Maybe (GenUsage uvar -> Pretty)
73 -> PprEnv tyvar uvar bndr occ
75 -- you can specify all the printers individually; if
76 -- you don't specify one, you get bottom
78 initPprEnv sty l d p c tv uv maj_bndr min_bndr occ ty use
92 demaybe Nothing = bottom
95 bottom = panic "PprEnv.initPprEnv: unspecified printing function"
98 initPprEnv sty pmaj pmin pocc
99 = PE (ppr sty) -- for a Literal
100 (ppr sty) -- for a DataCon
101 (ppr sty) -- for a PrimOp
102 (\ cc -> ppStr (showCostCentre sty True cc)) -- CostCentre
104 (ppr sty) -- for a tyvar
105 (ppr sty) -- for a usage var
107 pmaj pmin pocc -- for GenIds in various guises
109 (ppr sty) -- for a Type
110 (ppr sty) -- for a Usage
115 pStyle (PE s _ _ _ _ _ _ _ _ _ _ _) = s
116 pLit (PE _ pp _ _ _ _ _ _ _ _ _ _) = pp
117 pCon (PE _ _ pp _ _ _ _ _ _ _ _ _) = pp
118 pPrim (PE _ _ _ pp _ _ _ _ _ _ _ _) = pp
119 pSCC (PE _ _ _ _ pp _ _ _ _ _ _ _) = pp
121 pTyVar (PE _ _ _ _ _ pp _ _ _ _ _ _) = pp
122 pUVar (PE _ _ _ _ _ _ pp _ _ _ _ _) = pp
124 pMajBndr (PE _ _ _ _ _ _ _ pp _ _ _ _) = pp
125 pMinBndr (PE _ _ _ _ _ _ _ _ pp _ _ _) = pp
126 pOcc (PE _ _ _ _ _ _ _ _ _ pp _ _) = pp
128 pTy (PE _ _ _ _ _ _ _ _ _ _ pp _) = pp
129 pUse (PE _ _ _ _ _ _ _ _ _ _ _ pp) = pp
132 We tend to {\em renumber} everything before printing, so that
133 we get consistent Uniques on everything from run to run.
136 = NmbrEnv Unique -- next "Unique" to give out for a value
137 Unique -- ... for a tyvar
138 Unique -- ... for a usage var
139 (UniqFM Id) -- mapping for value vars we know about
140 (UniqFM TyVar) -- ... for tyvars
141 (UniqFM Unique{-UVar-}) -- ... for usage vars
143 type NmbrM a = NmbrEnv -> (NmbrEnv, a)
145 initNmbr :: NmbrM a -> a
148 (v1,t1,u1) = initRenumberingUniques
149 init_nmbr_env = NmbrEnv v1 t1 u1 emptyUFM emptyUFM emptyUFM
151 snd (m init_nmbr_env)
153 returnNmbr x nenv = (nenv, x)
157 (nenv2, res) = m nenv
161 mapNmbr f [] = returnNmbr []
163 = f x `thenNmbr` \ r ->
164 mapNmbr f xs `thenNmbr` \ rs ->
167 mapAndUnzipNmbr f [] = returnNmbr ([],[])
168 mapAndUnzipNmbr f (x:xs)
169 = f x `thenNmbr` \ (r1, r2) ->
170 mapAndUnzipNmbr f xs `thenNmbr` \ (rs1, rs2) ->
171 returnNmbr (r1:rs1, r2:rs2)
176 (nenv1, new_x1) = x1 nenv
178 (nenv1, thing new_x1)
180 nmbr2 nenv thing x1 x2
182 (nenv1, new_x1) = x1 nenv
183 (nenv2, new_x2) = x2 nenv1
185 (nenv2, thing new_x1 new_x2)
187 nmbr3 nenv thing x1 x2 x3
189 (nenv1, new_x1) = x1 nenv
190 (nenv2, new_x2) = x2 nenv1
191 (nenv3, new_x3) = x3 nenv2
193 (nenv3, thing new_x1 new_x2 new_x3)
196 rnumValVar = panic "rnumValVar"
197 rnumTyVar = panic "rnumTyVar"
198 rnumUVar = panic "rnumUVar"
199 lookupValVar = panic "lookupValVar"
200 lookupTyVar = panic "lookupTyVar"
201 lookupUVar = panic "lookupUVar"