X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Focaml%2Ftactics%2FfwdSimplTactic.ml;h=a5c7878c7341336a822e39587adcaa5947b9d018;hb=4167cea65ca58897d1a3dbb81ff95de5074700cc;hp=e7d25daae63ecc24e4457a91b3188d49054105a9;hpb=ebaf3deffea9ac78a2b8b2a6c128cc24ad8459ef;p=helm.git

diff --git a/helm/ocaml/tactics/fwdSimplTactic.ml b/helm/ocaml/tactics/fwdSimplTactic.ml
index e7d25daae..a5c7878c7 100644
--- a/helm/ocaml/tactics/fwdSimplTactic.ml
+++ b/helm/ocaml/tactics/fwdSimplTactic.ml
@@ -23,9 +23,8 @@
  * http://cs.unibo.it/helm/.
  *)
 
-(*
+
 module PEH = ProofEngineHelpers 
-*)
 module U  = CicUniv
 module TC = CicTypeChecker 
 module PET = ProofEngineTypes 
@@ -37,13 +36,22 @@ module MI = CicMkImplicit
 module PESR = ProofEngineStructuralRules
 
 let fail_msg0 = "unexported clearbody: invalid argument"
-let fail_msg1 = "fwd: argument is not premise in the current goal"
 let fail_msg2 = "fwd: no applicable simplification"
 
-let error msg = raise (PET.Fail msg)
+let error msg = raise (PET.Fail (lazy msg))
 
 (* unexported tactics *******************************************************)
 
+let id_tac = 
+   let id_tac (proof,goal) = 
+      try
+         let _, metasenv, _, _ = proof in
+         let _, _, _ = CicUtil.lookup_meta goal metasenv in
+         (proof,[goal])
+      with CicUtil.Meta_not_found _ -> (proof, [])
+   in 
+   PET.mk_tactic id_tac
+
 let clearbody ~index =
    let rec find_name index = function
       | Some (Cic.Name name, _) :: _ when index = 1 -> name
@@ -68,20 +76,21 @@ let strip_prods metasenv context ?how_many to_what term =
       metasenv, Cic.Meta (index, irl), index
    in
    let update_counters = function
-      | None, []                 -> None, T.id_tac, []
-      | None, to_what :: tail    -> None, PT.apply_tac ~term:to_what, tail
-      | Some hm, []              -> Some (pred hm), T.id_tac, []
-      | Some hm, to_what :: tail -> Some (pred hm), PT.apply_tac ~term:to_what, tail
+      | None, []                 -> None, false, id_tac, []
+      | None, to_what :: tail    -> None, true, PT.apply_tac ~term:to_what, tail
+      | Some hm, []              -> Some (pred hm), false, id_tac, []
+      | Some hm, to_what :: tail -> Some (pred hm), true, PT.apply_tac ~term:to_what, tail
    in 
    let rec aux metasenv metas conts tw = function
       | Some hm, _ when hm <= 0               -> metasenv, metas, conts 
       | xhm, Cic.Prod (Cic.Name _, t1, t2)    ->
          let metasenv, meta, index = mk_meta metasenv t1 in    
-	 aux metasenv (meta :: metas) ((T.id_tac, index) :: conts) tw (xhm, (S.subst meta t2))      
+	 aux metasenv (meta :: metas) (conts @ [id_tac, index]) tw (xhm, (S.subst meta t2))      
       | xhm, Cic.Prod (Cic.Anonymous, t1, t2) ->
-         let xhm, tac, tw = update_counters (xhm, tw) in 
+         let xhm, pos, tac, tw = update_counters (xhm, tw) in 
          let metasenv, meta, index = mk_meta metasenv t1 in    
-	 aux metasenv (meta :: metas) ((tac, index) :: conts) tw (xhm, (S.subst meta t2))
+	 let conts = if pos then (tac, index) :: conts else conts @ [tac, index] in 
+	 aux metasenv (meta :: metas) conts tw (xhm, (S.subst meta t2))
       | _, t                                  -> metasenv, metas, conts 
    in
    aux metasenv [] [] to_what (how_many, term)
@@ -95,9 +104,11 @@ let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~sub
       let lemma, _ = TC.type_of_aux' metasenv context what U.empty_ugraph in
       let lemma = FNG.clean_dummy_dependent_types lemma in
       let metasenv, metas, conts = strip_prods metasenv context ?how_many to_what lemma in      
-      let conclusion =  Cic.Appl (what :: List.rev metas) in
-      let tac = T.thens ~start:(letin_tac conclusion)
-	                ~continuations:[clearbody ~index:1]
+      let conclusion =  
+         match metas with [] -> what | _ -> Cic.Appl (what :: List.rev metas)
+      in
+      let tac = T.then_ ~start:(letin_tac conclusion) 
+        ~continuation:(clearbody ~index:1)
       in
       let proof = (xuri, metasenv, u, t) in
       let aux (proof, goals) (tac, goal) = 
@@ -110,19 +121,9 @@ let lapply_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~sub
 	 
 (* fwd **********************************************************************)
 
-let fwd_simpl_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) 
-                  ~hyp ~dbd =
-   let find_type metasenv context =
-      let rec aux p = function
-         | Some (Cic.Name name, Cic.Decl t) :: _ when name = hyp -> p, t
-         | Some (Cic.Name name, Cic.Def (_, Some t)) :: _ when name = hyp -> p, t
-         | Some (Cic.Name name, Cic.Def (u, _)) :: tail when name = hyp ->
-            p, fst (TC.type_of_aux' metasenv tail u U.empty_ugraph)
-         | _ :: tail -> aux (succ p) tail
-         | [] -> error fail_msg1
-      in
-      aux 1 context
-   in
+let fwd_simpl_tac
+     ?(mk_fresh_name_callback = FNG.mk_fresh_name ~subst:[])
+     ~dbd hyp =
    let lapply_tac to_what lemma = 
       lapply_tac ~mk_fresh_name_callback ~how_many:1 ~to_what:[to_what] lemma
    in
@@ -130,13 +131,13 @@ let fwd_simpl_tac ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~
       let (proof, goal) = status in
       let _, metasenv, _, _ = proof in
       let _, context, ty = CicUtil.lookup_meta goal metasenv in
-      let index, major = find_type metasenv context in 
+      let index, major = PEH.lookup_type metasenv context hyp in 
       match MetadataQuery.fwd_simpl ~dbd major with
          | []       -> error fail_msg2
          | uri :: _ -> 
 	    Printf.eprintf "fwd: %s\n" (UriManager.string_of_uri uri); flush stderr;
 	    let start = lapply_tac (Cic.Rel index) (Cic.Const (uri, [])) in  
-            let tac = T.thens ~start ~continuations:[PESR.clearbody hyp] in
+            let tac = T.then_ ~start ~continuation:(PESR.clear hyp) in
             PET.apply_tactic tac status
    in
    PET.mk_tactic fwd_simpl_tac