rename file

1 files changed, 26 insertions, 2 deletions

diff --git a/spartan/core/types.ML b/spartan/core/typechecking.ML
index 1eaf60b..437a2dc 100644
--- a/spartan/core/types.ML
+++ b/spartan/core/typechecking.ML
@@ -1,7 +1,7 @@
-(*  Title:      types.ML
+(*  Title:      typechecking.ML
     Author:     Joshua Chen
 
-Type information storage.
+Type information and typechecking infrastructure.
 *)
 
 structure Types: sig
@@ -11,8 +11,13 @@ val types: Proof.context -> term -> thm list
 val put_type: thm -> Proof.context -> Proof.context
 val put_types: thm list -> Proof.context -> Proof.context
 
+val check: Proof.context -> thm -> int -> tactic
+val infer: Proof.context -> thm -> int -> tactic
+
 end = struct
 
+(* Context data *)
+
 structure Data = Generic_Data (
   type T = thm Item_Net.T
   val empty = Item_Net.init Thm.eq_thm
@@ -26,4 +31,23 @@ fun types ctxt tm = Item_Net.retrieve (Data ctxt) tm
 fun put_type typing = Context.proof_map (Data.map (Item_Net.update typing))
 fun put_types typings = foldr1 (op o) (map put_type typings)
 
+
+(* Checking and inference *)
+
+local
+
+fun checkable prop = Lib.is_typing prop
+  andalso not (exists_subterm is_Var (Lib.type_of_typing prop))
+
+in
+
+fun check ctxt rule = Subgoal.FOCUS_PREMS (
+  fn {context = goal_ctxt, prems, concl, ...} => no_tac) ctxt
+
+fun infer ctxt rule = Subgoal.FOCUS_PREMS (
+  fn {context = goal_ctxt, prems, concl, ...} => no_tac) ctxt
+
+end
+
+
 end