X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Ftactics%2FdestructTactic.ml;h=8164fc5f68a2165029697fc74b4fbff6e31060c9;hb=5c0c5980586c1fc530fd304275607dd2f8afeba0;hp=ea871a0d4aff09e491194cf03d1dbf33ad0650b2;hpb=ae98f5490e20dd26ece5804d9847acfba0e4d16b;p=helm.git diff --git a/components/tactics/destructTactic.ml b/components/tactics/destructTactic.ml index ea871a0d4..8164fc5f6 100644 --- a/components/tactics/destructTactic.ml +++ b/components/tactics/destructTactic.ml @@ -39,7 +39,6 @@ module RT = ReductionTactics module PEH = ProofEngineHelpers module ET = EqualityTactics module DTI = DoubleTypeInference -module FNG = FreshNamesGenerator let debug = false let debug_print = @@ -244,40 +243,25 @@ let clear_term first_time lterm = in PET.mk_tactic clear_term -let simpl_in_term context = function - | Cic.Rel i -> - let name = match List.nth context (pred i) with - | Some (Cic.Name s, Cic.Def _) -> s - | Some (Cic.Name s, Cic.Decl _) -> s - | _ -> assert false - in - RT.simpl_tac ~pattern:(None,[name,Cic.Implicit (Some `Hole)],None) - | _ -> T.id_tac - -let mk_fresh_name metasenv context name typ = - let name = C.Name name in - match FNG.mk_fresh_name ~subst:[] metasenv context name ~typ with - | C.Name s -> s - | C.Anonymous -> assert false - let exists context = function | C.Rel i -> List.nth context (pred i) <> None | _ -> true -let rec recur_on_child_tac name = +let rec recur_on_child_tac ~before = let recur_on_child status = let (proof, goal) = status in let _, metasenv, _subst, _, _, _ = proof in let _, context, _ = CicUtil.lookup_meta goal metasenv in - debug_print (lazy ("\nrecur_on_child su: " ^ name)); + debug_print (lazy ("\nrecur_on_child")); debug_print (lazy ("nel contesto:\n" ^ CicPp.ppcontext context)); - let rec search_name i = function - | [] -> T.id_tac - | Some (Cic.Name n, _) :: _ when n = name -> - destruct ~first_time:false (Cic.Rel i) - | _ :: tl -> search_name (succ i) tl + let mk_lterm term c m ug = + let distance = List.length c - List.length context in + S.lift distance term, m, ug in - PET.apply_tactic (search_name 1 context) status + let lterm = mk_lterm (Cic.Rel 1) in + let continuation = destruct ~first_time:false lterm in + let tactic = T.then_ ~start:before ~continuation in + PET.apply_tactic tactic status in PET.mk_tactic recur_on_child @@ -442,13 +426,10 @@ and injection_tac ~lterm ~i ~continuation = PET.mk_tactic fill_cut in debug_print (lazy ("CUT: " ^ pp context cutted)); - let name = mk_fresh_name metasenv context "Hcut" cutted in - let mk_fresh_name_callback = PEH.namer_of [Some name] in - debug_print (lazy ("figlio: " ^ name)); let tactic = - T.thens ~start: (P.cut_tac ~mk_fresh_name_callback cutted) + T.thens ~start: (P.cut_tac cutted) ~continuations:[ - T.seq ~tactics:[continuation; recur_on_child_tac name]; + recur_on_child_tac continuation; fill_cut_tac term ] in @@ -474,17 +455,14 @@ 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 = - T.seq ~tactics:[continuation; recur_on_child_tac name] - in - debug_print (lazy ("figlio: " ^ name)); + let ok_tactic = recur_on_child_tac continuation 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 term = +and destruct ~first_time lterm = let are_convertible hd1 hd2 metasenv context = fst (CR.are_convertible ~metasenv context hd1 hd2 CU.empty_ugraph) in @@ -492,38 +470,38 @@ and destruct ~first_time term = let (proof, goal) = status in let _,metasenv,_subst, _,_, _ = proof in let _,context,_ = CicUtil.lookup_meta goal metasenv in - debug_print (lazy ("\ndestruct di: " ^ pp context term)); - debug_print (lazy ("nel contesto:\n" ^ CicPp.ppcontext context)); - let termty,_ = - CTC.type_of_aux' metasenv context term CU.empty_ugraph - in - debug_print (lazy ("\ndestruct su: " ^ pp context termty)); - let mk_lterm term c m ug = - let distance = List.length c - List.length context in - S.lift distance term, m, ug - in - let lterm = mk_lterm term in - let mk_subst_chain direction index with_what what = - let k = match term with C.Rel i -> i | _ -> -1 in - let rec traverse_context first_time j = function - | [] -> - let continuation = - T.seq ~tactics:[ - clear_term first_time lterm; - clear_term false (mk_lterm what); - clear_term false (mk_lterm with_what) - ] - in - subst_tac ~direction ~lterm ~where:None ~continuation - | 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) - ~continuation:(traverse_context false (succ j) tl) - | _ :: tl -> traverse_context first_time (succ j) tl + let term, metasenv, _ugraph = lterm context metasenv CU.empty_ugraph in + let tactic = if not (first_time || exists context term) then T.id_tac else begin + debug_print (lazy ("\ndestruct di: " ^ pp context term)); + debug_print (lazy ("nel contesto:\n" ^ CicPp.ppcontext context)); + let termty,_ = CTC.type_of_aux' metasenv context term CU.empty_ugraph in + debug_print (lazy ("\ndestruct su: " ^ pp context termty)); + let mk_lterm term c m ug = + let distance = List.length c - List.length context in + S.lift distance term, m, ug in - traverse_context first_time 1 context - in - let tac = match termty with + let lterm = mk_lterm term in + let mk_subst_chain direction index with_what what = + let k = match term with C.Rel i -> i | _ -> -1 in + let rec traverse_context first_time j = function + | [] -> + let continuation = + T.seq ~tactics:[ + clear_term first_time lterm; + clear_term false (mk_lterm what); + clear_term false (mk_lterm with_what) + ] + in + subst_tac ~direction ~lterm ~where:None ~continuation + | 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) + ~continuation:(traverse_context false (succ j) tl) + | _ :: tl -> traverse_context first_time (succ j) tl + in + traverse_context first_time 1 context + in + match termty with | C.Appl [(C.MutInd (equri, 0, [])) ; tty ; t1 ; t2] when LibraryObjects.is_eq_URI equri -> begin match t1,t2 with @@ -579,46 +557,34 @@ and destruct ~first_time term = end | _ when first_time -> raise exn_nothingtodo | _ (* when not first time *) -> T.id_tac - in - PET.apply_tactic tac status + end in + PET.apply_tactic tactic status in PET.mk_tactic destruct -let lazy_destruct_tac ~first_time ~lterm = - let lazy_destruct status = +(* destruct performs either injection or discriminate or subst *) +let destruct_tac xterm = + let destruct status = let (proof, goal) = status in let _,metasenv,_subst,_,_, _ = proof in let _,context,_ = CicUtil.lookup_meta goal metasenv in - let term, _, _ = lterm context metasenv CU.empty_ugraph in - let tactic = - if exists context term then destruct ~first_time term else T.id_tac + let mk_lterm term c m ug = + let distance = List.length c - List.length context in + S.lift distance term, m, ug in - PET.apply_tactic tactic status - in - PET.mk_tactic lazy_destruct - -(* destruct performs either injection or discriminate *) -(* equivalent to Coq's "analyze equality" *) -let destruct_tac = function - | Some term -> destruct ~first_time:true term - | None -> - let destruct_all status = - let (proof, goal) = status in - let _,metasenv,_subst,_,_, _ = proof in - let _,context,_ = CicUtil.lookup_meta goal metasenv in - let mk_lterm term c m ug = - let distance = List.length c - List.length context in - S.lift distance term, m, ug - in - let rec mk_tactics first_time i tacs = function - | [] -> List.rev tacs - | Some _ :: tl -> - let lterm = mk_lterm (C.Rel i) in - let tacs = lazy_destruct_tac ~first_time ~lterm :: tacs in - mk_tactics false (succ i) tacs tl - | _ :: tl -> mk_tactics first_time (succ i) tacs tl - in - let tactics = mk_tactics false 1 [] context in - PET.apply_tactic (T.seq ~tactics) status + let tactics = match xterm with + | Some term -> [destruct ~first_time:true (mk_lterm term)] + | None -> + let rec mk_tactics first_time i tacs = function + | [] -> List.rev tacs + | Some _ :: tl -> + let lterm = mk_lterm (C.Rel i) in + let tacs = destruct ~first_time lterm :: tacs in + mk_tactics false (succ i) tacs tl + | _ :: tl -> mk_tactics first_time (succ i) tacs tl + in + mk_tactics false 1 [] context in - PET.mk_tactic destruct_all + PET.apply_tactic (T.seq ~tactics) status + in + PET.mk_tactic destruct