version 0.7.1

[helm.git] / helm / ocaml / tactics / variousTactics.ml

diff --git a/helm/ocaml/tactics/variousTactics.ml b/helm/ocaml/tactics/variousTactics.ml
index c1006032471a7d6fffc86959dcedca987c4a05bf..8bbe05dcb77b1cc78f19e857033aec95e3bee5a2 100644 (file)
--- a/helm/ocaml/tactics/variousTactics.ml
+++ b/helm/ocaml/tactics/variousTactics.ml
@@ -63,39 +63,69 @@ let assumption_tac =
 
 (* ANCORA DA DEBUGGARE *)
 
+exception UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly;;
+exception TheSelectedTermsMustLiveInTheGoalContext
 exception AllSelectedTermsMustBeConvertible;;
-
-(* serve una funzione che cerchi nel ty dal basso a partire da term, i lambda
-e li aggiunga nel context, poi si conta la lunghezza di questo nuovo
-contesto e si lifta di tot... COSA SIGNIFICA TUTTO CIO'?????? *)
+exception GeneralizationInHypothesesNotImplementedYet;;
 
 let generalize_tac 
- ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) terms
+ ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[])
+ pattern
  =
+(*
   let module PET = ProofEngineTypes in
-  let generalize_tac mk_fresh_name_callback terms status =
+  let generalize_tac mk_fresh_name_callback
+       ~pattern:(term,hyps_pat,concl_pat) status
+  =
+   if hyps_pat <> [] then raise GeneralizationInHypothesesNotImplementedYet;
    let (proof, goal) = status in
    let module C = Cic in
    let module P = PrimitiveTactics in
    let module T = Tacticals in
     let _,metasenv,_,_ = proof in
-    let _,context,ty = CicUtil.lookup_meta goal metasenv in
-     let typ,_ =
-      match terms with
-         [] -> assert false
-       | he::tl ->
-           (* We need to check that all the convertibility of all the terms *)
-           let u = List.fold_left ( (* TASSI: FIXME *)
-            fun u t ->
-              let b,u1 = CicReduction.are_convertible context he t u in 
-                if not b then 
-                  raise AllSelectedTermsMustBeConvertible
-                else
-                  u1) CicUniv.empty_ugraph tl in
-             (CicTypeChecker.type_of_aux' metasenv context he u)
-     in
-      PET.apply_tactic 
-      (T.thens 
+    let (_,context,ty) as conjecture = CicUtil.lookup_meta goal metasenv in
+    let selected_hyps,terms_with_context =
+     ProofEngineHelpers.select ~metasenv ~conjecture ~pattern in
+    let typ,term =
+     match terms_with_context, term with
+        [], None ->
+         raise UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly
+      | _, Some term
+      | (_,term)::_, None ->
+         fst
+          (CicTypeChecker.type_of_aux' metasenv context term
+            CicUniv.empty_ugraph),
+         term in
+    (* We need to check:
+        1. whether they live in the context of the goal;
+           if they do they are also well-typed since they are closed subterms
+           of a well-typed term in the well-typed context of the well-typed
+           term
+        2. whether they are convertible
+    *)
+    ignore (
+     (* TASSI: FIXME *)
+     List.fold_left
+      (fun u (context_of_t,t) ->
+        (* 1 *)
+        begin
+         try
+          ignore
+           (CicMetaSubst.delift_rels [] metasenv
+             (List.length context_of_t - List.length context) t)
+         with
+          CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable ->
+           raise TheSelectedTermsMustLiveInTheGoalContext
+        end;
+        (* 2 *)
+        let b,u1 = CicReduction.are_convertible context term t u in 
+         if not b then 
+          raise AllSelectedTermsMustBeConvertible
+         else
+          u1
+      ) CicUniv.empty_ugraph terms_with_context) ;
+    PET.apply_tactic 
+     (T.thens 
        ~start:
          (P.cut_tac 
           (C.Prod(
@@ -103,22 +133,15 @@ let generalize_tac
             typ,
             (ProofEngineReduction.replace_lifting_csc 1
               ~equality:(==) 
-              ~what:terms
-              ~with_what:(List.map (function _ -> C.Rel 1) terms)
+              ~what:(List.map snd terms_with_context)
+              ~with_what:(List.map (function _ -> C.Rel 1) terms_with_context)
               ~where:ty)
           )))
-       ~continuations: [(P.apply_tac ~term:(C.Rel 1)) ; T.id_tac])
+       ~continuations:
+         [(P.apply_tac ~term:(C.Appl [C.Rel 1; CicSubstitution.lift 1 term])) ;
+           T.id_tac])
        status
  in
-  PET.mk_tactic (generalize_tac mk_fresh_name_callback terms)
+  PET.mk_tactic (generalize_tac mk_fresh_name_callback ~pattern)
+*) assert false
 ;;
-
-let set_goal n =
-  ProofEngineTypes.mk_tactic
-    (fun (proof, goal) ->
-       let (_, metasenv, _, _) = proof in
-       if CicUtil.exists_meta n metasenv then
-         (proof, [n])
-       else
-         raise (ProofEngineTypes.Fail ("no such meta: " ^ string_of_int n)))
-