X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Ftactics%2FdestructTactic.ml;h=a8bfc007d42ac395c2c5995686bc6cbc181daf33;hb=42f2dc48b4fef5b404f406bf512d6a0cde35c067;hp=8164fc5f68a2165029697fc74b4fbff6e31060c9;hpb=55891f80b4f14251dfd5c9111f22f5edcbde2e11;p=helm.git

diff --git a/components/tactics/destructTactic.ml b/components/tactics/destructTactic.ml
index 8164fc5f6..a8bfc007d 100644
--- a/components/tactics/destructTactic.ml
+++ b/components/tactics/destructTactic.ml
@@ -247,7 +247,7 @@ let exists context = function
    | C.Rel i -> List.nth context (pred i) <> None
    | _       -> true
 
-let rec recur_on_child_tac ~before =
+let recur_on_child_tac ~before ~after =
    let recur_on_child status = 
       let (proof, goal) = status in
       let _, metasenv, _subst, _, _, _ = proof in
@@ -259,13 +259,12 @@ let rec recur_on_child_tac ~before =
          S.lift distance term, m, ug
       in
       let lterm = mk_lterm (Cic.Rel 1) in
-      let continuation = destruct ~first_time:false lterm in
-      let tactic = T.then_ ~start:before ~continuation in
+      let tactic = T.then_ ~start:before ~continuation:(after lterm) in
       PET.apply_tactic tactic status  
    in
    PET.mk_tactic recur_on_child
    
-and injection_tac ~lterm ~i ~continuation =
+let injection_tac ~lterm ~i ~continuation ~recur =
  let give_name seed = function
    | C.Name _ as name -> name
    | C.Anonymous -> C.Name (incr seed; "y" ^ string_of_int !seed)
@@ -429,7 +428,7 @@ and injection_tac ~lterm ~i ~continuation =
 	let tactic = 
 	   T.thens ~start: (P.cut_tac cutted)
                    ~continuations:[
-	              recur_on_child_tac continuation;
+	              recur_on_child_tac continuation recur;
 		      fill_cut_tac term
 	           ]
         in
@@ -438,7 +437,7 @@ and injection_tac ~lterm ~i ~continuation =
  in
   PET.mk_tactic injection_tac
 
-and subst_tac ~lterm ~direction ~where ~continuation =
+let subst_tac ~lterm ~direction ~where ~continuation ~recur =
    let subst_tac status =
       let (proof, goal) = status in
       let _,metasenv,_subst,_,_, _ = proof in
@@ -455,17 +454,18 @@ and subst_tac ~lterm ~direction ~where ~continuation =
             debug_print (lazy ("nella premessa: " ^ name));
 	    let pattern = None, [name, PET.hole], None in
             let start = ET.rewrite_tac ~direction ~pattern term [] in
-            let ok_tactic = recur_on_child_tac continuation in
+            let ok_tactic = recur_on_child_tac continuation recur in
 	    T.if_ ~start ~continuation:ok_tactic ~fail:continuation	    
       in 
       PET.apply_tactic tactic status
    in
    PET.mk_tactic subst_tac
 
-and destruct ~first_time lterm =
+let rec destruct ~first_time lterm =
  let are_convertible hd1 hd2 metasenv context = 
    fst (CR.are_convertible ~metasenv context hd1 hd2 CU.empty_ugraph)
  in
+ let recur = destruct ~first_time:false in
  let destruct status = 
   let (proof, goal) = status in
   let _,metasenv,_subst, _,_, _ = proof in
@@ -492,10 +492,10 @@ and destruct ~first_time lterm =
 		    clear_term false (mk_lterm with_what)
 	         ]
 	      in
-	      subst_tac ~direction ~lterm ~where:None ~continuation
+	      subst_tac ~direction ~lterm ~where:None ~continuation ~recur
            | Some (C.Name name, _) :: tl when j < index && j <> k ->
 	      debug_print (lazy ("\nsubst programmata: cosa: " ^ string_of_int index ^ ", dove: " ^ string_of_int j));
-	      subst_tac ~direction ~lterm ~where:(Some name) 
+	      subst_tac ~direction ~lterm ~where:(Some name) ~recur 
 	                ~continuation:(traverse_context false (succ j) tl)
            | _ :: tl -> traverse_context first_time (succ j) tl
         in
@@ -519,7 +519,7 @@ and destruct ~first_time lterm =
                         if are_convertible hd1 hd2 metasenv context then
                            traverse_list first_time (succ i) tl1 tl2
                         else
-			   injection_tac ~i ~lterm ~continuation:
+			   injection_tac ~i ~lterm ~recur ~continuation:
 		              (traverse_list false (succ i) tl1 tl2)
                       | _ -> assert false 
                       (* i 2 termini hanno in testa lo stesso costruttore, 
@@ -563,7 +563,7 @@ and destruct ~first_time lterm =
    PET.mk_tactic destruct
 
 (* destruct performs either injection or discriminate or subst *)
-let destruct_tac xterm =
+let destruct_tac xterms =
    let destruct status =
       let (proof, goal) = status in
       let _,metasenv,_subst,_,_, _ = proof in
@@ -572,9 +572,11 @@ let destruct_tac xterm =
          let distance = List.length c - List.length context in
           S.lift distance term, m, ug
       in
-      let tactics = match xterm with 
-         | Some term -> [destruct ~first_time:true (mk_lterm term)]
-         | None      ->
+      let tactics = match xterms with 
+         | Some terms -> 
+	    let map term = destruct ~first_time:false (mk_lterm term) in
+	    List.map map terms
+         | None       ->
             let rec mk_tactics first_time i tacs = function
 	       | []           -> List.rev tacs
 	       | Some _ :: tl ->