From: Ferruccio Guidi Date: Wed, 24 Oct 2007 10:50:58 +0000 (+0000) Subject: - new function for general relocation of local references (rels) in terms X-Git-Tag: 0.4.95@7852~108 X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=5a011973dc06d4c9a985c7a2a56421cd358c58a5;p=helm.git - new function for general relocation of local references (rels) in terms - swapped names injection and injection1 --- diff --git a/components/tactics/discriminationTactics.ml b/components/tactics/discriminationTactics.ml index 9d83ad595..21b609949 100644 --- a/components/tactics/discriminationTactics.ml +++ b/components/tactics/discriminationTactics.ml @@ -25,28 +25,75 @@ (* $Id$ *) +module C = Cic +module U = UriManager +module P = PrimitiveTactics +module T = Tacticals +module CR = CicReduction +module PST = ProofEngineStructuralRules +module PET = ProofEngineTypes +module CTC = CicTypeChecker +module CU = CicUniv +module S = CicSubstitution + let debug = false let debug_print = if debug then (fun x -> prerr_endline (Lazy.force x)) else (fun _ -> ()) ;; +(* funzione generale di rilocazione dei riferimenti locali *) + +let relocate_term map t = + let rec map_xnss k xnss = + let imap (uri, t) = uri, map_term k t in + List.map imap xnss + and map_mss k mss = + let imap = function + | None -> None + | Some t -> Some (map_term k t) + in + List.map imap mss + and map_fs len k fs = + let imap (name, i, ty, bo) = name, i, map_term k ty, map_term (k + len) bo in + List.map imap fs + and map_cfs len k cfs = + let imap (name, ty, bo) = name, map_term k ty, map_term (k + len) bo in + List.map imap cfs + and map_term k = function + | C.Rel m -> if m < k then C.Rel m else C.Rel (map (m - k)) + | C.Sort _ as t -> t + | C.Implicit _ as t -> t + | C.Var (uri, xnss) -> C.Var (uri, map_xnss k xnss) + | C.Const (uri, xnss) -> C.Const (uri, map_xnss k xnss) + | C.MutInd (uri, tyno, xnss) -> C.MutInd (uri, tyno, map_xnss k xnss) + | C.MutConstruct (uri, tyno, consno, xnss) -> + C.MutConstruct (uri, tyno, consno, map_xnss k xnss) + | C.Meta (i, mss) -> C.Meta(i, map_mss k mss) + | C.Cast (te, ty) -> C.Cast (map_term k te, map_term k ty) + | C.Appl ts -> C.Appl (List.map (map_term k) ts) + | C.MutCase (sp, i, outty, t, pl) -> + C.MutCase (sp, i, map_term k outty, map_term k t, List.map (map_term k) pl) + | C.Prod (n, s, t) -> C.Prod (n, map_term k s, map_term (succ k) t) + | C.Lambda (n, s, t) -> C.Lambda (n, map_term k s, map_term (succ k) t) + | C.LetIn (n, s, t) -> C.LetIn (n, map_term k s, map_term (succ k) t) + | C.Fix (i, fs) -> C.Fix (i, map_fs (List.length fs) k fs) + | C.CoFix (i, cfs) -> C.CoFix (i, map_cfs (List.length cfs) k cfs) + in + map_term 0 t + (* term ha tipo t1=t2; funziona solo se t1 e t2 hanno in testa costruttori diversi *) let discriminate_tac ~term = - let module C = Cic in - let module U = UriManager in - let module P = PrimitiveTactics in - let module T = Tacticals in let true_URI = match LibraryObjects.true_URI () with Some uri -> uri - | None -> raise (ProofEngineTypes.Fail (lazy "You need to register the default \"true\" definition first. Please use the \"default\" command")) in + | None -> raise (PET.Fail (lazy "You need to register the default \"true\" definition first. Please use the \"default\" command")) in let false_URI = match LibraryObjects.false_URI () with Some uri -> uri - | None -> raise (ProofEngineTypes.Fail (lazy "You need to register the default \"false\" definition first. Please use the \"default\" command")) in - let fail msg = raise (ProofEngineTypes.Fail (lazy ("Discriminate: " ^ msg))) in + | None -> raise (PET.Fail (lazy "You need to register the default \"false\" definition first. Please use the \"default\" command")) in + let fail msg = raise (PET.Fail (lazy ("Discriminate: " ^ msg))) in let find_discriminating_consno t1 t2 = let rec aux t1 t2 = match t1, t2 with @@ -90,11 +137,11 @@ let discriminate_tac ~term = List.map (fun (id,cty) -> (* dubbio: e' corretto ridurre in questo context ??? *) - let red_ty = CicReduction.whd context cty in + let red_ty = CR.whd context cty in let rec aux t k = match t with | C.Prod (_,_,target) when (k <= paramsno) -> - CicSubstitution.subst (List.nth args (k-1)) + S.subst (List.nth args (k-1)) (aux target (k+1)) | C.Prod (binder,source,target) when (k > paramsno) -> C.Lambda (binder, source, (aux target (k+1))) @@ -103,7 +150,7 @@ let discriminate_tac ~term = then (C.MutInd(false_URI,0,[])) else (C.MutInd(true_URI,0,[])) in - (CicSubstitution.lift 1 (aux red_ty 1))) + (S.lift 1 (aux red_ty 1))) constructor_list in let outtype = let seed = ref 0 in @@ -126,7 +173,7 @@ let discriminate_tac ~term = C.Appl (C.MutInd (turi, typeno, []) :: (List.map - (CicSubstitution.lift (argsno + 1)) + (S.lift (argsno + 1)) (List.rev rev_left_args)) @ mk_rels argsno) else @@ -134,7 +181,7 @@ let discriminate_tac ~term = C.Sort C.Prop) | 0, _, _ -> assert false (* seriously screwed up *) | n, he::tl, C.Prod (_,_,ta) -> - mk_lambdas (he::rev_left_args)(n-1,tl,CicSubstitution.subst he ta) + mk_lambdas (he::rev_left_args)(n-1,tl,S.subst he ta) | n,_,_ -> assert false (* we should probably reduce in some context *) in @@ -148,7 +195,7 @@ let discriminate_tac ~term = let _,metasenv,_subst,_,_, _ = proof in let _,context,_ = CicUtil.lookup_meta goal metasenv in let termty,_ = - CicTypeChecker.type_of_aux' metasenv context term CicUniv.empty_ugraph + CTC.type_of_aux' metasenv context term CicUniv.empty_ugraph in match termty with | C.Appl [(C.MutInd (equri, 0, [])) ; tty ; t1 ; t2] @@ -169,14 +216,14 @@ let discriminate_tac ~term = let branches,outtype = mk_branches_and_outtype turi typeno consno context args in - ProofEngineTypes.apply_tactic + PET.apply_tactic (T.then_ ~start:(EliminationTactics.elim_type_tac (C.MutInd (false_URI, 0, []))) ~continuation: (T.then_ ~start: (ReductionTactics.change_tac - ~pattern:(ProofEngineTypes.conclusion_pattern None) + ~pattern:(PET.conclusion_pattern None) (fun _ m u -> C.Appl [ C.Lambda ( C.Name "x", tty, @@ -188,157 +235,47 @@ let discriminate_tac ~term = ~start: (EqualityTactics.rewrite_simpl_tac ~direction:`RightToLeft - ~pattern:(ProofEngineTypes.conclusion_pattern None) + ~pattern:(PET.conclusion_pattern None) term []) ~continuation: (IntroductionTactics.constructor_tac ~n:1)))) status | _ -> fail "not an equality" in - ProofEngineTypes.mk_tactic (discriminate'_tac ~term) -;; + PET.mk_tactic (discriminate'_tac ~term) let exn_nonproj = - ProofEngineTypes.Fail (lazy "Injection: not a projectable equality");; + PET.Fail (lazy "Injection: not a projectable equality") let exn_noneq = - ProofEngineTypes.Fail (lazy "Injection: not an equality");; + PET.Fail (lazy "Injection: not an equality") let exn_nothingtodo = - ProofEngineTypes.Fail (lazy "Nothing to do");; + PET.Fail (lazy "Nothing to do") let exn_discrnonind = - ProofEngineTypes.Fail (lazy "Discriminate: object is not an Inductive Definition: it's imposible");; + PET.Fail (lazy "Discriminate: object is not an Inductive Definition: it's imposible") let exn_injwronggoal = - ProofEngineTypes.Fail (lazy "Injection: goal after cut is not correct");; + PET.Fail (lazy "Injection: goal after cut is not correct") let exn_noneqind = - ProofEngineTypes.Fail (lazy "Injection: not an equality over elements of an inductive type");; + PET.Fail (lazy "Injection: not an equality over elements of an inductive type") let pp ctx t = let names = List.map (function Some (n,_) -> Some n | None -> None) ctx in CicPp.pp t names -;; -let rec injection_tac ~first_time ~term ~liftno ~continuation = - let module C = Cic in - let module CR = CicReduction in - let module U = UriManager in - let module P = PrimitiveTactics in - let module T = Tacticals in - let module PST = ProofEngineStructuralRules in - let module PET = ProofEngineTypes in - let are_convertible hd1 hd2 metasenv context = - fst (CR.are_convertible ~metasenv context hd1 hd2 CicUniv.empty_ugraph) - in - let injection_tac ~term status = - let (proof, goal) = status in - let _,metasenv,_subst, _,_, _ = proof in - let _,context,_ = CicUtil.lookup_meta goal metasenv in - let term = CicSubstitution.lift liftno term in - let termty,_ = - CicTypeChecker.type_of_aux' metasenv context term CicUniv.empty_ugraph - in - debug_print (lazy ("\ninjection su: " ^ pp context termty)); - let tac = - match termty with - | C.Appl [(C.MutInd (equri, 0, [])) ; tty ; t1 ; t2] - when LibraryObjects.is_eq_URI equri -> begin - match (CicReduction.whd ~delta:true context tty) with - | C.MutInd (turi,typeno,ens) - | C.Appl (C.MutInd (turi,typeno,ens)::_) -> begin - match t1,t2 with - | C.MutConstruct (uri1,typeno1,consno1,ens1), - C.MutConstruct (uri2,typeno2,consno2,ens2) - when (uri1 = uri2) && (typeno1 = typeno2) && - (consno1 = consno2) && (ens1 = ens2) -> - if first_time then raise exn_nothingtodo - else continuation ~liftno - | C.Appl ((C.MutConstruct (uri1,typeno1,consno1,ens1))::applist1), - C.Appl ((C.MutConstruct (uri2,typeno2,consno2,ens2))::applist2) - when (uri1 = uri2) && (typeno1 = typeno2) && - (consno1 = consno2) && (ens1 = ens2) -> - let rec traverse_list i l1 l2 = - match l1,l2 with - | [],[] when first_time -> continuation - | [],[] -> begin - match term with - | C.Rel n -> begin - match List.nth context (n-1) with - | Some (C.Name id,_) -> - fun ~liftno -> - T.then_ ~start:(PST.clear ~hyps:[id]) - ~continuation:(continuation ~liftno) - | _ -> assert false - end - | _ -> assert false - end - | hd1::tl1,hd2::tl2 -> - if are_convertible hd1 hd2 metasenv context then - traverse_list (i+1) tl1 tl2 - else - injection1_tac ~i ~term - ~continuation:(traverse_list (i+1) tl1 tl2) - | _ -> assert false - (* i 2 termini hanno in testa lo stesso costruttore, - * ma applicato a un numero diverso di termini *) - in - traverse_list 1 applist1 applist2 ~liftno - | C.MutConstruct (uri1,typeno1,consno1,ens1), - C.MutConstruct (uri2,typeno2,consno2,ens2) - | C.MutConstruct (uri1,typeno1,consno1,ens1), - C.Appl ((C.MutConstruct (uri2,typeno2,consno2,ens2))::_) - | C.Appl ((C.MutConstruct (uri1,typeno1,consno1,ens1))::_), - C.MutConstruct (uri2,typeno2,consno2,ens2) - | C.Appl ((C.MutConstruct (uri1,typeno1,consno1,ens1))::_), - C.Appl ((C.MutConstruct (uri2,typeno2,consno2,ens2))::_) - when (consno1 <> consno2) || (ens1 <> ens2) -> - discriminate_tac ~term - | _ when not first_time -> continuation ~liftno - | _ (* when first_time *) -> - match term with - | Cic.Rel i -> - let name = - match List.nth context (i-1) with - | Some (Cic.Name s, Cic.Def _) -> s - | Some (Cic.Name s, Cic.Decl _) -> s - | _ -> assert false - in - Tacticals.then_ - ~start:(ReductionTactics.simpl_tac - ~pattern:(None,[name,Cic.Implicit (Some `Hole)],None)) - ~continuation:(injection_tac ~first_time:false ~term ~liftno - ~continuation) - | _ -> raise exn_nonproj - end - | _ when not first_time -> continuation ~liftno - | _ (* when first_time *) -> raise exn_nonproj - end - | _ -> raise exn_nonproj - in - PET.apply_tactic tac status - in - PET.mk_tactic (injection_tac ~term) - -and injection1_tac ~term ~i ~liftno ~continuation = - let module C = Cic in - let module CTC = CicTypeChecker in - let module CU = CicUniv in - let module S = CicSubstitution in - let module U = UriManager in - let module P = PrimitiveTactics in - let module PET = ProofEngineTypes in - let module T = Tacticals in +let rec injection_tac ~term ~i ~liftno ~continuation = let give_name seed = function | C.Name _ as name -> name | C.Anonymous -> C.Name (incr seed; "y" ^ string_of_int !seed) in let rec mk_rels = function | 0 -> [] | n -> C.Rel n :: (mk_rels (n - 1)) in - let injection1_tac ~term ~i status = + let injection_tac ~term ~i status = let (proof, goal) = status in (* precondizione: t1 e t2 hanno in testa lo stesso costruttore ma * differiscono (o potrebbero differire?) nell'i-esimo parametro * del costruttore *) - let term = CicSubstitution.lift liftno term in + let term = S.lift liftno term in let _,metasenv,_subst,_,_, _ = proof in let _,context,_ = CicUtil.lookup_meta goal metasenv in let termty,_ = - CicTypeChecker.type_of_aux' metasenv context term CicUniv.empty_ugraph + CTC.type_of_aux' metasenv context term CicUniv.empty_ugraph in debug_print (lazy ("\ninjection1 su : " ^ pp context termty)); match termty with (* an equality *) @@ -371,11 +308,11 @@ and injection1_tac ~term ~i ~liftno ~continuation = let seed = ref 0 in List.map (function (id,cty) -> - let reduced_cty = CicReduction.whd context cty in + let reduced_cty = CR.whd context cty in let rec aux k = function | C.Prod (_,_,tgt) when k <= paramsno -> let left = List.nth left_params (k-1) in - aux (k+1) (CicSubstitution.subst left tgt) + aux (k+1) (S.subst left tgt) | C.Prod (binder,source,target) when k > paramsno -> let binder' = give_name seed binder in C.Lambda (binder',source,(aux (k+1) target)) @@ -385,29 +322,29 @@ and injection1_tac ~term ~i ~liftno ~continuation = else S.lift nr_param_constr t1' (* + 1 per liftare anche il lambda aggiunto * esternamente al case *) - in CicSubstitution.lift 1 (aux 1 reduced_cty)) + in S.lift 1 (aux 1 reduced_cty)) constructor_list in (* this code should be taken from cases_tac *) let outtype = let seed = ref 0 in let rec to_lambdas te head = - match CicReduction.whd context te with + match CR.whd context te with | C.Prod (binder,so,ta) -> let binder' = give_name seed binder in C.Lambda (binder',so,to_lambdas ta head) | _ -> head in let rec skip_prods params te = - match params, CicReduction.whd context te with + match params, CR.whd context te with | [], _ -> te | left::tl, C.Prod (_,_,ta) -> - skip_prods tl (CicSubstitution.subst left ta) + skip_prods tl (S.subst left ta) | _, _ -> assert false in let abstracted_tty = let tty = - List.fold_left (fun x y -> CicSubstitution.subst y x) tty left_params + List.fold_left (fun x y -> S.subst y x) tty left_params in (* non lift, ma subst coi left! *) match S.lift 1 tty with @@ -441,22 +378,22 @@ and injection1_tac ~term ~i ~liftno ~continuation = (* check if cutted and changed are well typed and if t1' ~ changed *) let go_on = try - let _,g = CicTypeChecker.type_of_aux' metasenv context cutted + let _,g = CTC.type_of_aux' metasenv context cutted CicUniv.empty_ugraph in - let _,g = CicTypeChecker.type_of_aux' metasenv context changed g in - fst (CicReduction.are_convertible ~metasenv context t1' changed g) + let _,g = CTC.type_of_aux' metasenv context changed g in + fst (CR.are_convertible ~metasenv context t1' changed g) with - | CicTypeChecker.TypeCheckerFailure _ -> false + | CTC.TypeCheckerFailure _ -> false in if not go_on then - PET.apply_tactic Tacticals.id_tac status + PET.apply_tactic T.id_tac status else (debug_print (lazy ("CUT: " ^ pp context cutted)); PET.apply_tactic (T.thens ~start: (P.cut_tac cutted) ~continuations: - [injection_tac ~first_time:false ~liftno:0 ~term:(C.Rel 1) + [injection1_tac ~first_time:false ~liftno:0 ~term:(C.Rel 1) ~continuation: (fun ~liftno:x -> continuation ~liftno:(liftno+1+x)) (* here I need to lift all the continuations by 1; @@ -507,12 +444,103 @@ and injection1_tac ~term ~i ~liftno ~continuation = status) | _ -> raise exn_noneq in - PET.mk_tactic (injection1_tac ~term ~i) -;; + PET.mk_tactic (injection_tac ~term ~i) + +and injection1_tac ~first_time ~term ~liftno ~continuation = + let are_convertible hd1 hd2 metasenv context = + fst (CR.are_convertible ~metasenv context hd1 hd2 CicUniv.empty_ugraph) + in + let injection1_tac ~term status = + let (proof, goal) = status in + let _,metasenv,_subst, _,_, _ = proof in + let _,context,_ = CicUtil.lookup_meta goal metasenv in + let term = S.lift liftno term in + let termty,_ = + CTC.type_of_aux' metasenv context term CicUniv.empty_ugraph + in + debug_print (lazy ("\ninjection su: " ^ pp context termty)); + let tac = + match termty with + | C.Appl [(C.MutInd (equri, 0, [])) ; tty ; t1 ; t2] + when LibraryObjects.is_eq_URI equri -> begin + match (CR.whd ~delta:true context tty) with + | C.MutInd (turi,typeno,ens) + | C.Appl (C.MutInd (turi,typeno,ens)::_) -> begin + match t1,t2 with + | C.MutConstruct (uri1,typeno1,consno1,ens1), + C.MutConstruct (uri2,typeno2,consno2,ens2) + when (uri1 = uri2) && (typeno1 = typeno2) && + (consno1 = consno2) && (ens1 = ens2) -> + if first_time then raise exn_nothingtodo + else continuation ~liftno + | C.Appl ((C.MutConstruct (uri1,typeno1,consno1,ens1))::applist1), + C.Appl ((C.MutConstruct (uri2,typeno2,consno2,ens2))::applist2) + when (uri1 = uri2) && (typeno1 = typeno2) && + (consno1 = consno2) && (ens1 = ens2) -> + let rec traverse_list i l1 l2 = + match l1,l2 with + | [],[] when first_time -> continuation + | [],[] -> begin + match term with + | C.Rel n -> begin + match List.nth context (n-1) with + | Some (C.Name id,_) -> + fun ~liftno -> + T.then_ ~start:(PST.clear ~hyps:[id]) + ~continuation:(continuation ~liftno) + | _ -> assert false + end + | _ -> assert false + end + | hd1::tl1,hd2::tl2 -> + if are_convertible hd1 hd2 metasenv context then + traverse_list (i+1) tl1 tl2 + else + injection_tac ~i ~term + ~continuation:(traverse_list (i+1) tl1 tl2) + | _ -> assert false + (* i 2 termini hanno in testa lo stesso costruttore, + * ma applicato a un numero diverso di termini *) + in + traverse_list 1 applist1 applist2 ~liftno + | C.MutConstruct (uri1,typeno1,consno1,ens1), + C.MutConstruct (uri2,typeno2,consno2,ens2) + | C.MutConstruct (uri1,typeno1,consno1,ens1), + C.Appl ((C.MutConstruct (uri2,typeno2,consno2,ens2))::_) + | C.Appl ((C.MutConstruct (uri1,typeno1,consno1,ens1))::_), + C.MutConstruct (uri2,typeno2,consno2,ens2) + | C.Appl ((C.MutConstruct (uri1,typeno1,consno1,ens1))::_), + C.Appl ((C.MutConstruct (uri2,typeno2,consno2,ens2))::_) + when (consno1 <> consno2) || (ens1 <> ens2) -> + discriminate_tac ~term + | _ when not first_time -> continuation ~liftno + | _ (* when first_time *) -> + match term with + | Cic.Rel i -> + let name = + match List.nth context (i-1) with + | Some (Cic.Name s, Cic.Def _) -> s + | Some (Cic.Name s, Cic.Decl _) -> s + | _ -> assert false + in + T.then_ + ~start:(ReductionTactics.simpl_tac + ~pattern:(None,[name,Cic.Implicit (Some `Hole)],None)) + ~continuation:(injection1_tac ~first_time:false ~term ~liftno + ~continuation) + | _ -> raise exn_nonproj + end + | _ when not first_time -> continuation ~liftno + | _ (* when first_time *) -> raise exn_nonproj + end + | _ -> raise exn_nonproj + in + PET.apply_tactic tac status + in + PET.mk_tactic (injection1_tac ~term) (* destruct performs either injection or discriminate *) (* equivalent to Coq's "analyze equality" *) let destruct_tac = - injection_tac - ~first_time:true ~liftno:0 ~continuation:(fun ~liftno -> Tacticals.id_tac) -;; + injection1_tac + ~first_time:true ~liftno:0 ~continuation:(fun ~liftno -> T.id_tac)