%
-% (c) The AQUA Project, Glasgow University, 1996
+% (c) The AQUA Project, Glasgow University, 1996-1998
%
\section[PprEnv]{The @PprEnv@ type}
\begin{code}
-#include "HsVersions.h"
-
module PprEnv (
- PprEnv{-abstract-},
+ PprEnv, --
+ BindingSite(..),
initPprEnv,
- pCon, pLit, pMajBndr, pMinBndr, pOcc, pPrim, pSCC, pStyle,
- pTy, pTyVar, pUVar, pUse,
-
- NmbrEnv(..),
- NmbrM(..), initNmbr,
- returnNmbr, thenNmbr,
- mapNmbr, mapAndUnzipNmbr
--- nmbr1, nmbr2, nmbr3
--- rnumValVar, rnumTyVar, rnumUVar,
--- lookupValVar, lookupTyVar, lookupUVar
+ pCon, pBndr, pOcc, pSCC,
+ pTy, pTyVarO
) where
-IMP_Ubiq(){-uitous-}
+#include "HsVersions.h"
-import Pretty ( Pretty(..) )
-import Unique ( initRenumberingUniques )
-import UniqFM ( emptyUFM )
-import Util ( panic )
+import {-# SOURCE #-} Const ( Con )
+
+import Var ( Id, TyVar )
+import CostCentre ( CostCentre )
+import Type ( Type )
+import Outputable
\end{code}
-For tyvars and uvars, we {\em do} normally use these homogenized
-names; for values, we {\em don't}. In printing interfaces, though,
-we use homogenized value names, so that interfaces don't wobble
-uncontrollably from changing Unique-based names.
+%************************************************************************
+%* *
+\subsection{Public interfaces for Core printing (excluding instances)}
+%* *
+%************************************************************************
\begin{code}
-data PprEnv tyvar uvar bndr occ
- = PE PprStyle -- stored for safe keeping
+data PprEnv bndr
+ = PE {
+ pCon :: Con -> SDoc,
+ pSCC :: CostCentre -> SDoc,
- (Literal -> Pretty) -- Doing these this way saves
- (Id -> Pretty) -- carrying around a PprStyle
- (PrimOp -> Pretty)
- (CostCentre -> Pretty)
+ pTyVarO :: TyVar -> SDoc, -- to print tyvar occurrences
+ pTy :: Type -> SDoc, -- to print types
- (tyvar -> Pretty) -- to print tyvars
- (uvar -> Pretty) -- to print usage vars
+ pBndr :: BindingSite -> bndr -> SDoc, -- to print value binders
+ pOcc :: Id -> SDoc -- to print value occurrences
+ }
+\end{code}
- (bndr -> Pretty) -- to print "major" val_bdrs
- (bndr -> Pretty) -- to print "minor" val_bdrs
- (occ -> Pretty) -- to print bindees
+@BindingSite@ is used to tell the thing that prints binder what
+language construct is binding the identifier.
- (GenType tyvar uvar -> Pretty)
- (GenUsage uvar -> Pretty)
+\begin{code}
+data BindingSite = LambdaBind | CaseBind | LetBind
\end{code}
\begin{code}
initPprEnv
- :: PprStyle
- -> Maybe (Literal -> Pretty)
- -> Maybe (Id -> Pretty)
- -> Maybe (PrimOp -> Pretty)
- -> Maybe (CostCentre -> Pretty)
- -> Maybe (tyvar -> Pretty)
- -> Maybe (uvar -> Pretty)
- -> Maybe (bndr -> Pretty)
- -> Maybe (bndr -> Pretty)
- -> Maybe (occ -> Pretty)
- -> Maybe (GenType tyvar uvar -> Pretty)
- -> Maybe (GenUsage uvar -> Pretty)
- -> PprEnv tyvar uvar bndr occ
+ :: Maybe (Con -> SDoc)
+ -> Maybe (CostCentre -> SDoc)
+ -> Maybe (TyVar -> SDoc)
+ -> Maybe (Type -> SDoc)
+ -> Maybe (BindingSite -> bndr -> SDoc)
+ -> Maybe (Id -> SDoc)
+ -> PprEnv bndr
-- you can specify all the printers individually; if
-- you don't specify one, you get bottom
-initPprEnv sty l d p c tv uv maj_bndr min_bndr occ ty use
- = PE sty
- (demaybe l)
- (demaybe d)
- (demaybe p)
+initPprEnv p c tvo ty bndr occ
+ = PE (demaybe p)
(demaybe c)
- (demaybe tv)
- (demaybe uv)
- (demaybe maj_bndr)
- (demaybe min_bndr)
- (demaybe occ)
+ (demaybe tvo)
(demaybe ty)
- (demaybe use)
+ (demaybe bndr)
+ (demaybe occ)
where
demaybe Nothing = bottom
demaybe (Just x) = x
bottom = panic "PprEnv.initPprEnv: unspecified printing function"
-
-{-
-initPprEnv sty pmaj pmin pocc
- = PE (ppr sty) -- for a Literal
- (ppr sty) -- for a DataCon
- (ppr sty) -- for a PrimOp
- (\ cc -> ppStr (showCostCentre sty True cc)) -- CostCentre
-
- (ppr sty) -- for a tyvar
- (ppr sty) -- for a usage var
-
- pmaj pmin pocc -- for GenIds in various guises
-
- (ppr sty) -- for a Type
- (ppr sty) -- for a Usage
--}
-\end{code}
-
-\begin{code}
-pStyle (PE s _ _ _ _ _ _ _ _ _ _ _) = s
-pLit (PE _ pp _ _ _ _ _ _ _ _ _ _) = pp
-pCon (PE _ _ pp _ _ _ _ _ _ _ _ _) = pp
-pPrim (PE _ _ _ pp _ _ _ _ _ _ _ _) = pp
-pSCC (PE _ _ _ _ pp _ _ _ _ _ _ _) = pp
-
-pTyVar (PE _ _ _ _ _ pp _ _ _ _ _ _) = pp
-pUVar (PE _ _ _ _ _ _ pp _ _ _ _ _) = pp
-
-pMajBndr (PE _ _ _ _ _ _ _ pp _ _ _ _) = pp
-pMinBndr (PE _ _ _ _ _ _ _ _ pp _ _ _) = pp
-pOcc (PE _ _ _ _ _ _ _ _ _ pp _ _) = pp
-
-pTy (PE _ _ _ _ _ _ _ _ _ _ pp _) = pp
-pUse (PE _ _ _ _ _ _ _ _ _ _ _ pp) = pp
\end{code}
-We tend to {\em renumber} everything before printing, so that
-we get consistent Uniques on everything from run to run.
-\begin{code}
-data NmbrEnv
- = NmbrEnv Unique -- next "Unique" to give out for a value
- Unique -- ... for a tyvar
- Unique -- ... for a usage var
- (UniqFM Id) -- mapping for value vars we know about
- (UniqFM TyVar) -- ... for tyvars
- (UniqFM Unique{-UVar-}) -- ... for usage vars
-
-type NmbrM a = NmbrEnv -> (NmbrEnv, a)
-
-initNmbr :: NmbrM a -> a
-initNmbr m
- = let
- (v1,t1,u1) = initRenumberingUniques
- init_nmbr_env = NmbrEnv v1 t1 u1 emptyUFM emptyUFM emptyUFM
- in
- snd (m init_nmbr_env)
-
-returnNmbr x nenv = (nenv, x)
-
-thenNmbr m k nenv
- = let
- (nenv2, res) = m nenv
- in
- k res nenv2
-
-mapNmbr f [] = returnNmbr []
-mapNmbr f (x:xs)
- = f x `thenNmbr` \ r ->
- mapNmbr f xs `thenNmbr` \ rs ->
- returnNmbr (r:rs)
-
-mapAndUnzipNmbr f [] = returnNmbr ([],[])
-mapAndUnzipNmbr f (x:xs)
- = f x `thenNmbr` \ (r1, r2) ->
- mapAndUnzipNmbr f xs `thenNmbr` \ (rs1, rs2) ->
- returnNmbr (r1:rs1, r2:rs2)
-
-{-
-nmbr1 nenv thing x1
- = let
- (nenv1, new_x1) = x1 nenv
- in
- (nenv1, thing new_x1)
-
-nmbr2 nenv thing x1 x2
- = let
- (nenv1, new_x1) = x1 nenv
- (nenv2, new_x2) = x2 nenv1
- in
- (nenv2, thing new_x1 new_x2)
-
-nmbr3 nenv thing x1 x2 x3
- = let
- (nenv1, new_x1) = x1 nenv
- (nenv2, new_x2) = x2 nenv1
- (nenv3, new_x3) = x3 nenv2
- in
- (nenv3, thing new_x1 new_x2 new_x3)
--}
-
-rnumValVar = panic "rnumValVar"
-rnumTyVar = panic "rnumTyVar"
-rnumUVar = panic "rnumUVar"
-lookupValVar = panic "lookupValVar"
-lookupTyVar = panic "lookupTyVar"
-lookupUVar = panic "lookupUVar"
-\end{code}
projects / ghc-hetmet.git / blobdiff