"by j let x : T such that P(x)" generalized to allow arbitrary justifications.

[helm.git] / components / tactics / declarative.ml

diff --git a/components/tactics/declarative.ml b/components/tactics/declarative.ml
index 77276d92909866cfcba3c458c10f99eccc32f472..110f72fb1fb4c5fb511be332f50ff552e858c539 100644 (file)
--- a/components/tactics/declarative.ml
+++ b/components/tactics/declarative.ml
@@ -121,22 +121,41 @@ let we_need_to_prove t id ty =
       ProofEngineTypes.mk_tactic aux
 ;;
 
-let existselim t id1 t1 id2 t2 =
-(*BUG: t1 and t2 not used *)
-(*PARSING BUG: t2 is parsed in the current context, but it may
-  have occurrences of id1 in it *)
- Tactics.elim_intros t
-  ~mk_fresh_name_callback:
-    (let i = ref 0 in
-      fun _ _ _  ~typ ->
-       incr i;
-       if !i = 1 then Cic.Name id1 else Cic.Name id2)
+let existselim ~dbd ~universe t id1 t1 id2 t2 =
+ let aux (proof, goal) = 
+  let (n,metasenv,bo,ty,attrs) = proof in
+  let metano,context,_ = CicUtil.lookup_meta goal metasenv in
+  let t2, metasenv, _ = t2 (Some (Cic.Name id1, Cic.Decl t1) :: context) metasenv CicUniv.oblivion_ugraph in
+  let proof' = (n,metasenv,bo,ty,attrs) in
+   ProofEngineTypes.apply_tactic (
+   Tacticals.thens
+    ~start:(Tactics.cut (Cic.Appl [Cic.MutInd (UriManager.uri_of_string "cic:/matita/logic/connectives/ex.ind", 0, []); t1 ; Cic.Lambda (Cic.Name id1, t1, t2)]))
+    ~continuations:
+     [ Tactics.elim_intros (Cic.Rel 1)
+        ~mk_fresh_name_callback:
+          (let i = ref 0 in
+            fun _ _ _  ~typ ->
+             incr i;
+             if !i = 1 then Cic.Name id1 else Cic.Name id2) ;
+       (match t with
+          None -> Tactics.auto ~dbd ~params:[] ~universe
+        | Some t -> Tactics.apply t)
+     ]) (proof', goal)
+ in
+  ProofEngineTypes.mk_tactic aux
+;;
 
-let andelim = existselim;;
+let andelim t id1 t1 id2 t2 = 
+ Tactics.elim_intros t
+      ~mk_fresh_name_callback:
+        (let i = ref 0 in
+          fun _ _ _  ~typ ->
+           incr i;
+           if !i = 1 then Cic.Name id1 else Cic.Name id2)
 
 let rewritingstep ~dbd ~universe lhs rhs just last_step =
  let aux ((proof,goal) as status) =
-  let (curi,metasenv,proofbo,proofty) = proof in
+  let (curi,metasenv,proofbo,proofty, attrs) = proof in
   let _,context,gty = CicUtil.lookup_meta goal metasenv in
   let eq,trans =
    match LibraryObjects.eq_URI () with
@@ -196,7 +215,7 @@ let rewritingstep ~dbd ~universe lhs rhs just last_step =
              FreshNamesGenerator.mk_fresh_name ~subst:[] metasenv context
                (Cic.Name name) ~typ
            in
-            let proof = curi,metasenv,proofbo,proofty in
+            let proof = curi,metasenv,proofbo,proofty, attrs in
             let proof,goals =
              ProofEngineTypes.apply_tactic
               (Tacticals.thens
@@ -225,6 +244,11 @@ let rewritingstep ~dbd ~universe lhs rhs just last_step =
   ProofEngineTypes.mk_tactic aux
 ;;
 
+let we_proceed_by_cases_on t pat =
+ (*BUG here: pat unused *)
+ Tactics.cases_intros t
+;;
+
 let we_proceed_by_induction_on t pat =
  (*BUG here: pat unused *)
  Tactics.elim_intros ~depth:0 t