X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcSplice.lhs;h=6146dfcacbe49f2368b9d53ecace7a42d3ffe1e3;hb=930421d4ed09e5389e0ef4c5eef36075a6809cc0;hp=e03993aab32ae5b16594b3ad3cce9b26e37930c8;hpb=1e50fd4185479a62e02d987bdfcb1c62712859ca;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcSplice.lhs b/compiler/typecheck/TcSplice.lhs
index e03993a..6146dfc 100644
--- a/compiler/typecheck/TcSplice.lhs
+++ b/compiler/typecheck/TcSplice.lhs
@@ -15,6 +15,7 @@ TcSplice: Template Haskell splices
 
 module TcSplice( kcSpliceType, tcSpliceExpr, tcSpliceDecls, tcBracket,
                  lookupThName_maybe,
+todoSession, todoTcM,
                  runQuasiQuoteExpr, runQuasiQuotePat, runAnnotation ) where
 
 #include "HsVersions.h"
@@ -81,6 +82,65 @@ import GHC.Desugar      ( AnnotationWrapper(..) )
 
 import GHC.Exts		( unsafeCoerce#, Int#, Int(..) )
 import System.IO.Error
+
+
+--here for every bad reason :-)
+import InstEnv
+import FamInstEnv
+--Session
+todoSession :: HscEnv -> Name -> IO (Messages, Maybe (LHsDecl RdrName))
+todoSession hsc_env name
+  = initTcPrintErrors hsc_env iNTERACTIVE $ 
+    setInteractiveContext hsc_env (hsc_IC hsc_env) $
+    todoTcM name
+
+
+todoTcM :: Name -> TcM (LHsDecl RdrName)
+todoTcM name = do
+  tcTyThing <- TcEnv.tcLookup name
+  thInfo <- TcSplice.reifyThing tcTyThing
+  let Just thDec = thGetDecFromInfo thInfo --BUG!
+  let Right [hsdecl] = Convert.convertToHsDecls
+        (error "srcspan of different package?")
+        [thDec]
+  return hsdecl
+
+thGetDecFromInfo :: TH.Info -> Maybe TH.Dec
+thGetDecFromInfo (TH.ClassI dec) = Just dec
+thGetDecFromInfo (TH.ClassOpI {}) = error "classop"
+thGetDecFromInfo (TH.TyConI dec) = Just dec
+thGetDecFromInfo (TH.PrimTyConI {}) = Nothing --error "sometimes we can invent a signature? or it's better not to?"
+thGetDecFromInfo (TH.DataConI {}) = error "datacon"
+thGetDecFromInfo (TH.VarI _name _type (Just dec) _fixity) = Just dec
+thGetDecFromInfo (TH.VarI _name _type Nothing _fixity) = error "vari"
+thGetDecFromInfo (TH.TyVarI {}) = Nothing --tyvars don't have decls? they kinda have a type though...
+
+setInteractiveContext :: HscEnv -> InteractiveContext -> TcRn a -> TcRn a
+setInteractiveContext hsc_env icxt thing_inside 
+  = let -- Initialise the tcg_inst_env with instances from all home modules.  
+        -- This mimics the more selective call to hptInstances in tcRnModule.
+	(home_insts, home_fam_insts) = hptInstances hsc_env (\_mod -> True)
+    in
+    updGblEnv (\env -> env { 
+	tcg_rdr_env      = ic_rn_gbl_env icxt,
+	tcg_inst_env     = extendInstEnvList    (tcg_inst_env env) home_insts,
+	tcg_fam_inst_env = extendFamInstEnvList (tcg_fam_inst_env env) 
+                                                home_fam_insts 
+      }) $
+
+    tcExtendGhciEnv (ic_tmp_ids icxt) $
+        -- tcExtendGhciEnv does lots: 
+        --   - it extends the local type env (tcl_env) with the given Ids,
+        --   - it extends the local rdr env (tcl_rdr) with the Names from 
+        --     the given Ids
+        --   - it adds the free tyvars of the Ids to the tcl_tyvars
+        --     set.
+        --
+        -- later ids in ic_tmp_ids must shadow earlier ones with the same
+        -- OccName, and tcExtendIdEnv implements this behaviour.
+
+    do	{ traceTc (text "setIC" <+> ppr (ic_tmp_ids icxt))
+ 	; thing_inside }
 \end{code}
 
 Note [Template Haskell levels]