From 3f80cc92f978742517a77c8a48a6e471a1eb8393 Mon Sep 17 00:00:00 2001
From: Iavor Diatchki <iavor.diatchki@gmail.com>
Date: Wed, 27 Sep 2017 16:43:00 -0700
Subject: [PATCH] Checkpoint: not complete, commit to continue WFH

---
 src/Cryptol/ModuleSystem/InstantiateModule.hs | 102 ++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 src/Cryptol/ModuleSystem/InstantiateModule.hs

diff --git a/src/Cryptol/ModuleSystem/InstantiateModule.hs b/src/Cryptol/ModuleSystem/InstantiateModule.hs
new file mode 100644
index 00000000..e372a684
--- /dev/null
+++ b/src/Cryptol/ModuleSystem/InstantiateModule.hs
@@ -0,0 +1,102 @@
+-- | Assumes that local names do not shadow top level names.
+module Cryptol.ModuleSystem.InstantiateModule (instantiateModule) where
+
+import Data.Set (Set)
+import qualified Data.Set as Set
+
+import Cryptol.ModuleSystem.Name
+import Cryptol.TypeCheck.AST
+
+instantiateModule ::
+  Supply           {- ^ Use to generate fresh names -} ->
+  Module           {- ^ This is the functor the instantiate -} ->
+  Map TParam Type  {- ^ Definitions of type parameters -} ->
+  Map Name Expr    {- ^ Definitions of function parameters -} ->
+  (Module,Supply)
+instantiateModule = undefined
+
+type InstM = IO
+
+data Env = Env
+  { funNameMap  :: Map Name Name
+  , tyNameMap   :: Map Name Name
+  , tyParamMap  :: Map TParam Name
+  }
+
+class Inst t where
+  inst :: Env -> t -> t
+
+instance Inst a => Inst [a] where
+  inst env = map (inst env)
+
+instance Inst Expr where
+  inst env = go
+    where
+    go expr =
+      case expr of
+        EVar x                    -> undefined
+
+        EList xs t                -> EList (go xs) (inst env t)
+        ETuple es                 -> ETuple (go es)
+        ERec xs                   -> ERec [ (f,go e) | (f,e) <- xs ]
+        ESel e s                  -> ESel (go e) s
+        EIf e1 e2 e3              -> EIf (go e1) (go e2) (go e3)
+        EComp t1 t2 e mss         -> EComp (inst env t1) (inst env t2)
+                                           (go e)
+                                           (inst mss)
+        ETAbs t e                 -> ETAbs t (go e)
+        ETApp e t                 -> ETApp (go e) (inst env t)
+        EApp e1 e2                -> EApp (go e1) (go e2)
+        EAbs x t e                -> EAbs x (inst env t) (go e)
+        EProofAbs p e             -> EProofAbs (inst env t) (go e)
+        EProofApp e               -> EProofApp (go e)
+        EWhere e ds               -> EWhere (go e) (inst env ds)
+
+
+instance Inst DeclGroup where
+  inst env d =
+    case d of
+      NonRecursive d -> NonRecursive (inst env d)
+      Recursive ds   -> Recursive (inst env ds)
+
+instance Inst Decl where
+  inst env d = d { dSignature = inst env (dSignature d)
+                 , dDefinition = inst env (dDefinition d)
+                 }
+
+instance Inst Match where
+  inst env m =
+    case m of
+      From x t1 t2 e -> From x (inst env t1) (inst env t2) (inst env e)
+      Let d          -> Let (inst env d)
+
+instance Inst Schema where
+  inst env s = s { sProps = inst env (sProps s)
+                 , sType  = inst env (sType s)
+                 }
+
+instance Inst Type where
+  inst env ty =
+    case ty of
+      TCon tc ts    -> TCon (inst env tc) (inst env ts)
+      TVar tv       -> undefined
+      TUser x ts t  -> TUser (undefined x) (inst env ts) (inst env t)
+      TRec fs       -> TRec [ (f, inst env t) | (f,t) <- fs ]
+
+
+
+class Defines t where
+  defines :: t -> Set Name
+
+instance Defines t => Defines [t]
+  defines = Set.unoins . map defines
+
+instance Defines Decl where
+  defines = Set.singleton . dName
+
+instance Defines DeclGroup where
+  defines d =
+    case d of
+      NonRecursive x -> defines x
+      Recursive x    -> defines x
+