[project @ 2002-04-29 14:03:38 by simonmar]

[ghc-hetmet.git] / ghc / compiler / deSugar / Desugar.lhs

diff --git a/ghc/compiler/deSugar/Desugar.lhs b/ghc/compiler/deSugar/Desugar.lhs
index 261f319..55152d9 100644 (file)
--- a/ghc/compiler/deSugar/Desugar.lhs
+++ b/ghc/compiler/deSugar/Desugar.lhs
@@ -4,19 +4,21 @@
 \section[Desugar]{@deSugar@: the main function}
 
 \begin{code}
-module Desugar ( deSugar, deSugarExpr ) where
+module Desugar ( deSugar, deSugarExpr,
+                 deSugarCore ) where
 
 #include "HsVersions.h"
 
 import CmdLineOpts     ( DynFlags, DynFlag(..), dopt, opt_SccProfilingOn )
-import HscTypes                ( ModDetails(..) )
+import HscTypes                ( ModDetails(..), TypeEnv )
 import HsSyn           ( MonoBinds, RuleDecl(..), RuleBndr(..), 
                          HsExpr(..), HsBinds(..), MonoBinds(..) )
-import TcHsSyn         ( TypecheckedRuleDecl, TypecheckedHsExpr )
+import TcHsSyn         ( TypecheckedRuleDecl, TypecheckedHsExpr,
+                          TypecheckedCoreBind )
 import TcModule                ( TcResults(..) )
 import Id              ( Id )
 import CoreSyn
-import PprCore         ( pprIdCoreRule, pprCoreExpr )
+import PprCore         ( pprIdRules, pprCoreExpr )
 import Subst           ( substExpr, mkSubst, mkInScopeSet )
 import DsMonad
 import DsExpr          ( dsExpr )
@@ -35,6 +37,7 @@ import ErrUtils               ( doIfSet, dumpIfSet_dyn, pprBagOfWarnings )
 import Outputable
 import UniqSupply      ( mkSplitUniqSupply )
 import HscTypes                ( HomeSymbolTable, PersistentCompilerState(..), TyThing(..), lookupType,  )
+import FastString
 \end{code}
 
 %************************************************************************
@@ -51,14 +54,14 @@ deSugar :: DynFlags
        -> PersistentCompilerState -> HomeSymbolTable
        -> Module -> PrintUnqualified
         -> TcResults
-       -> IO (ModDetails, (SDoc, SDoc, [FAST_STRING], [CoreBndr]))
+       -> IO (ModDetails, (SDoc, SDoc, [FastString], [CoreBndr]))
 
 deSugar dflags pcs hst mod_name unqual
-        (TcResults {tc_env   = type_env,
-                   tc_binds = all_binds,
-                   tc_insts = insts,
-                   tc_rules = rules,
-                   tc_fords = fo_decls})
+        (TcResults {tc_env    = type_env,
+                   tc_binds  = all_binds,
+                   tc_insts  = insts,
+                   tc_rules  = rules,
+                   tc_fords  = fo_decls})
   = do { showPass dflags "Desugar"
        ; us <- mkSplitUniqSupply 'd'
 
@@ -67,7 +70,7 @@ deSugar dflags pcs hst mod_name unqual
                                             (dsProgram mod_name all_binds rules fo_decls)    
 
              (ds_binds, ds_rules, foreign_stuff) = ds_result
-       
+             
              mod_details = ModDetails { md_types = type_env,
                                         md_insts = insts,
                                         md_rules = ds_rules,
@@ -150,7 +153,25 @@ dsProgram mod_name all_binds rules fo_decls
 ppr_ds_rules [] = empty
 ppr_ds_rules rules
   = text "" $$ text "-------------- DESUGARED RULES -----------------" $$
-    vcat (map pprIdCoreRule rules)
+    pprIdRules rules
+\end{code}
+
+Simplest thing in the world, desugaring External Core:
+
+\begin{code}
+deSugarCore :: (TypeEnv, [TypecheckedCoreBind], [TypecheckedRuleDecl])
+           -> IO (ModDetails, (SDoc, SDoc, [FastString], [CoreBndr]))
+deSugarCore (type_env, pairs, rules) 
+  = return (mod_details, no_foreign_stuff)
+  where
+    mod_details = ModDetails { md_types = type_env
+                            , md_insts = []
+                            , md_rules = ds_rules
+                            , md_binds = ds_binds }
+    ds_binds = [Rec pairs]
+    ds_rules = [(fun,rule) | IfaceRuleOut fun rule <- rules]
+
+    no_foreign_stuff = (empty,empty,[],[])
 \end{code}