import {-# SOURCE #-} InteractiveEval ( Resume )
#endif
-import RdrName ( GlobalRdrEnv, emptyGlobalRdrEnv, GlobalRdrElt(..),
- mkRdrUnqual, ImpDeclSpec(..), Provenance(..),
- ImportSpec(..), lookupGlobalRdrEnv, lookupGRE_RdrName )
+import RdrName
import Name ( Name, NamedThing, getName, nameOccName, nameModule )
import NameEnv
import NameSet
import TyCon
import DataCon ( DataCon, dataConImplicitIds )
import PrelNames ( gHC_PRIM )
-import Packages ( PackageId )
+import Packages hiding ( Version(..) )
import DynFlags ( DynFlags(..), isOneShot, HscTarget (..) )
import DriverPhases ( HscSource(..), isHsBoot, hscSourceString, Phase )
import BasicTypes ( Version, initialVersion, IPName,
import UniqSupply ( UniqSupply )
import FastString ( FastString )
import StringBuffer ( StringBuffer )
+import Util
import System.Time ( ClockTime )
import Data.IORef
#endif
}
-icPrintUnqual :: InteractiveContext -> PrintUnqualified
-icPrintUnqual ictxt = mkPrintUnqualified (ic_rn_gbl_env ictxt)
+icPrintUnqual :: DynFlags -> InteractiveContext -> PrintUnqualified
+icPrintUnqual dflags ictxt = mkPrintUnqualified dflags (ic_rn_gbl_env ictxt)
extendInteractiveContext
%* *
%************************************************************************
+Deciding how to print names is pretty tricky. We are given a name
+P:M.T, where P is the package name, M is the defining module, and T is
+the occurrence name, and we have to decide in which form to display
+the name given a GlobalRdrEnv describing the current scope.
+
+Ideally we want to display the name in the form in which it is in
+scope. However, the name might not be in scope at all, and that's
+where it gets tricky. Here are the cases:
+
+ 1. T uniquely maps to P:M.T ---> "T"
+ 2. there is an X for which X.T uniquely maps to P:M.T ---> "X.T"
+ 3. there is no binding for "M.T" ---> "M.T"
+ 4. otherwise ---> "P:M.T"
+
+3 and 4 apply when P:M.T is not in scope. In these cases we want to
+refer to the name as "M.T", but "M.T" might mean something else in the
+current scope (e.g. if there's an "import X as M"), so to avoid
+confusion we avoid using "M.T" if there's already a binding for it.
+
+There's one further subtlety: if the module M cannot be imported
+because it is not exposed by any package, then we must refer to it as
+"P:M". This is handled by the qual_mod component of PrintUnqualified.
+
\begin{code}
-mkPrintUnqualified :: GlobalRdrEnv -> PrintUnqualified
-mkPrintUnqualified env = (qual_name, qual_mod)
+mkPrintUnqualified :: DynFlags -> GlobalRdrEnv -> PrintUnqualified
+mkPrintUnqualified dflags env = (qual_name, qual_mod)
where
qual_name mod occ -- The (mod,occ) pair is the original name of the thing
- | [gre] <- unqual_gres, right_name gre = Nothing
+ | [gre] <- unqual_gres, right_name gre = NameUnqual
-- If there's a unique entity that's in scope unqualified with 'occ'
-- AND that entity is the right one, then we can use the unqualified name
- | [gre] <- qual_gres = Just (get_qual_mod (gre_prov gre))
+ | [gre] <- qual_gres = NameQual (get_qual_mod (gre_prov gre))
- | null qual_gres = Just (moduleName mod)
- -- it isn't in scope at all, this probably shouldn't happen,
- -- but we'll qualify it by the original module anyway.
+ | null qual_gres =
+ if null (lookupGRE_RdrName (mkRdrQual (moduleName mod) occ) env)
+ then NameNotInScope1
+ else NameNotInScope2
| otherwise = panic "mkPrintUnqualified"
where
get_qual_mod LocalDef = moduleName mod
get_qual_mod (Imported is) = ASSERT( not (null is) ) is_as (is_decl (head is))
- qual_mod mod = Nothing -- For now, we never qualify module names with their packages
+ -- we can mention a module P:M without the P: qualifier iff
+ -- "import M" would resolve unambiguously to P:M. (if P is the
+ -- current package we can just assume it is unqualified).
+
+ qual_mod mod
+ | modulePackageId mod == thisPackage dflags = False
+
+ | [pkgconfig] <- [pkg | (pkg,exposed_module) <- lookup,
+ exposed pkg && exposed_module],
+ packageConfigId pkgconfig == modulePackageId mod
+ -- this says: we are given a module P:M, is there just one exposed package
+ -- that exposes a module M, and is it package P?
+ = False
+
+ | otherwise = True
+ where lookup = lookupModuleInAllPackages dflags (moduleName mod)
\end{code}
\begin{code}
tyThingTyCon (ATyCon tc) = tc
-tyThingTyCon other = pprPanic "tyThingTyCon" (ppr other)
+tyThingTyCon other = pprPanic "tyThingTyCon" (pprTyThing other)
tyThingClass (AClass cls) = cls
-tyThingClass other = pprPanic "tyThingClass" (ppr other)
+tyThingClass other = pprPanic "tyThingClass" (pprTyThing other)
tyThingDataCon (ADataCon dc) = dc
-tyThingDataCon other = pprPanic "tyThingDataCon" (ppr other)
+tyThingDataCon other = pprPanic "tyThingDataCon" (pprTyThing other)
tyThingId (AnId id) = id
-tyThingId other = pprPanic "tyThingId" (ppr other)
+tyThingId other = pprPanic "tyThingId" (pprTyThing other)
\end{code}
%************************************************************************
projects / ghc-hetmet.git / blobdiff