X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Ftactics%2FprimitiveTactics.ml;h=70b82092c8b16b688f186e7495d6104d67a56e3b;hb=cf25aeb5fa2c00ebfe93454fbe33421d590506d4;hp=3822b7eac075fd825a98b79b1383a5880dab1535;hpb=6719c0e318b312b51b089fea3d69d1b7103245ea;p=helm.git diff --git a/helm/software/components/tactics/primitiveTactics.ml b/helm/software/components/tactics/primitiveTactics.ml index 3822b7eac..70b82092c 100644 --- a/helm/software/components/tactics/primitiveTactics.ml +++ b/helm/software/components/tactics/primitiveTactics.ml @@ -366,6 +366,12 @@ let apply_tac ~term = in PET.mk_tactic (apply_tac ~term) +let applyP_tac ~term = + let applyP_tac status = + let res = PET.apply_tactic (apply_tac ~term) status in res + in + PET.mk_tactic applyP_tac + let intros_tac ?howmany ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) ()= let intros_tac (proof, goal) = @@ -514,20 +520,17 @@ let mk_predicate_for_elim (* FG: we find the predicate for the eliminator as in the rewrite tactic ****) let argty, _ugraph = TC.type_of_aux' metasenv context arg ugraph in let argty = CicReduction.whd context argty in - let fresh_name = + let fresh_name = FreshNamesGenerator.mk_fresh_name - ~subst:[] metasenv context' C.Anonymous ~typ:argty - in + ~subst:[] metasenv context' C.Anonymous ~typ:argty in let hyp = Some (fresh_name, C.Decl argty) in let lazy_term c m u = - let distance = List.length c - List.length context in - S.lift distance arg, m, u - in + let distance = List.length c - List.length context in + S.lift distance arg, m, u in let pattern = Some lazy_term, [], Some cpattern' in let subst, metasenv, _ugraph, _conjecture, selected_terms = - ProofEngineHelpers.select - ~metasenv ~ugraph ~conjecture:(0, context, pred) ~pattern - in + ProofEngineHelpers.select ~metasenv ~ugraph + ~conjecture:(0, context, pred) ~pattern in let metasenv = MS.apply_subst_metasenv subst metasenv in let map (_context_of_t, t) l = t :: l in let what = List.fold_right map selected_terms [] in @@ -607,17 +610,184 @@ let beta_after_elim_tac upto predicate = PET.apply_tactic tactic status in PET.mk_tactic beta_after_elim_tac - + +(* ANCORA DA DEBUGGARE *) + +exception UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly;; +exception TheSelectedTermsMustLiveInTheGoalContext +exception AllSelectedTermsMustBeConvertible;; +exception GeneralizationInHypothesesNotImplementedYet;; + +let generalize_tac + ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) + pattern + = + let module PET = ProofEngineTypes in + let generalize_tac mk_fresh_name_callback + ~pattern:(term,hyps_pat,_) status + = + if hyps_pat <> [] then raise GeneralizationInHypothesesNotImplementedYet; + let (proof, goal) = status in + let module C = Cic in + let module T = Tacticals in + let uri,metasenv,_subst,pbo,pty, attrs = proof in + let (_,context,ty) as conjecture = CicUtil.lookup_meta goal metasenv in + let subst,metasenv,u,selected_hyps,terms_with_context = + ProofEngineHelpers.select ~metasenv ~ugraph:CicUniv.oblivion_ugraph + ~conjecture ~pattern in + let context = CicMetaSubst.apply_subst_context subst context in + let metasenv = CicMetaSubst.apply_subst_metasenv subst metasenv in + let pbo = lazy (CicMetaSubst.apply_subst subst (Lazy.force pbo)) in + let pty = CicMetaSubst.apply_subst subst pty in + let term = + match term with + None -> None + | Some term -> + Some (fun context metasenv ugraph -> + let term, metasenv, ugraph = term context metasenv ugraph in + CicMetaSubst.apply_subst subst term, + CicMetaSubst.apply_subst_metasenv subst metasenv, + ugraph) + in + let u,typ,term, metasenv' = + let context_of_t, (t, metasenv, u) = + match terms_with_context, term with + [], None -> + raise + UnableToDetectTheTermThatMustBeGeneralizedYouMustGiveItExplicitly + | [], Some t -> context, t context metasenv u + | (context_of_t, _)::_, Some t -> + context_of_t, t context_of_t metasenv u + | (context_of_t, t)::_, None -> context_of_t, (t, metasenv, u) + in + let t,subst,metasenv' = + try + CicMetaSubst.delift_rels [] metasenv + (List.length context_of_t - List.length context) t + with + CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable -> + raise TheSelectedTermsMustLiveInTheGoalContext + in + (*CSC: I am not sure about the following two assertions; + maybe I need to propagate the new subst and metasenv *) + assert (subst = []); + assert (metasenv' = metasenv); + let typ,u = CicTypeChecker.type_of_aux' ~subst metasenv context t u in + u,typ,t,metasenv + in + (* We need to check: + 1. whether they live in the context of the goal; + if they do they are also well-typed since they are closed subterms + of a well-typed term in the well-typed context of the well-typed + term + 2. whether they are convertible + *) + ignore ( + List.fold_left + (fun u (context_of_t,t) -> + (* 1 *) + let t,subst,metasenv'' = + try + CicMetaSubst.delift_rels [] metasenv' + (List.length context_of_t - List.length context) t + with + CicMetaSubst.DeliftingARelWouldCaptureAFreeVariable -> + raise TheSelectedTermsMustLiveInTheGoalContext in + (*CSC: I am not sure about the following two assertions; + maybe I need to propagate the new subst and metasenv *) + assert (subst = []); + assert (metasenv'' = metasenv'); + (* 2 *) + let b,u1 = CicReduction.are_convertible ~subst context term t u in + if not b then + raise AllSelectedTermsMustBeConvertible + else + u1 + ) u terms_with_context) ; + let status = (uri,metasenv',_subst,pbo,pty, attrs),goal in + let proof,goals = + PET.apply_tactic + (T.thens + ~start: + (cut_tac + (C.Prod( + (mk_fresh_name_callback metasenv context C.Anonymous ~typ:typ), + typ, + (ProofEngineReduction.replace_lifting_csc 1 + ~equality:(==) + ~what:(List.map snd terms_with_context) + ~with_what:(List.map (function _ -> C.Rel 1) terms_with_context) + ~where:ty) + ))) + ~continuations: + [(apply_tac ~term:(C.Appl [C.Rel 1; CicSubstitution.lift 1 term])) ; + T.id_tac]) + status + in + let _,metasenv'',_subst,_,_, _ = proof in + (* CSC: the following is just a bad approximation since a meta + can be closed and then re-opened! *) + (proof, + goals @ + (List.filter + (fun j -> List.exists (fun (i,_,_) -> i = j) metasenv'') + (ProofEngineHelpers.compare_metasenvs ~oldmetasenv:metasenv + ~newmetasenv:metasenv'))) + in + PET.mk_tactic (generalize_tac mk_fresh_name_callback ~pattern) +;; + +let generalize_pattern_tac pattern = + let generalize_pattern_tac (proof,goal) = + let _,metasenv,_,_,_,_ = proof in + let conjecture = CicUtil.lookup_meta goal metasenv in + let _,context,_ = conjecture in + let generalize_hyps = + let _,hpatterns,_ = ProofEngineHelpers.sort_pattern_hyps context pattern in + List.map fst hpatterns in + let ids_and_patterns = + List.map + (fun id -> + let rel,_ = ProofEngineHelpers.find_hyp id context in + id,(Some (fun ctx m u -> CicSubstitution.lift (List.length ctx - List.length context) rel,m,u), [], Some (ProofEngineTypes.hole)) + ) generalize_hyps in + let tactics = + List.map + (function (id,pattern) -> + Tacticals.then_ ~start:(generalize_tac pattern) + ~continuation:(Tacticals.try_tactic + (ProofEngineStructuralRules.clear [id])) + ) ids_and_patterns + in + PET.apply_tactic (Tacticals.seq tactics) (proof,goal) + in + PET.mk_tactic (generalize_pattern_tac) +;; + +let pattern_after_generalize_pattern_tac (tp, hpatterns, cpattern) = + let cpattern = + match cpattern with + None -> ProofEngineTypes.hole + | Some t -> t + in + let cpattern = + List.fold_left + (fun t (_,ty) -> Cic.Prod (Cic.Anonymous, ty, t)) cpattern hpatterns + in + tp, [], Some cpattern +;; + let elim_tac ?using ?(pattern = PET.conclusion_pattern None) term = - let elim_tac (proof, goal) = - let cpattern = match pattern with - | None, [], Some cpattern -> cpattern - | _ -> raise (PET.Fail (lazy "not implemented")) - in + let elim_tac pattern (proof, goal) = let ugraph = CicUniv.oblivion_ugraph in let curi, metasenv, _subst, proofbo, proofty, attrs = proof in let conjecture = CicUtil.lookup_meta goal metasenv in let metano, context, ty = conjecture in + let pattern = pattern_after_generalize_pattern_tac pattern in + let cpattern = + match pattern with + | None, [], Some cpattern -> cpattern + | _ -> raise (PET.Fail (lazy "not implemented")) in let termty,_ugraph = TC.type_of_aux' metasenv context term ugraph in let termty = CicReduction.whd context termty in let termty, metasenv', arguments, _fresh_meta = @@ -710,17 +880,39 @@ let elim_tac ?using ?(pattern = PET.conclusion_pattern None) term = (T.then_ ~start:(PET.mk_tactic (fun _ -> res)) ~continuation) dummy_status in - PET.mk_tactic elim_tac + let reorder_pattern ((proof, goal) as status) = + let _,metasenv,_,_,_,_ = proof in + let conjecture = CicUtil.lookup_meta goal metasenv in + let _,context,_ = conjecture in + let pattern = ProofEngineHelpers.sort_pattern_hyps context pattern in + PET.apply_tactic + (Tacticals.then_ ~start:(generalize_pattern_tac pattern) + ~continuation:(PET.mk_tactic (elim_tac pattern))) status + in + PET.mk_tactic reorder_pattern ;; -let cases_intros_tac ?(howmany=(-1)) ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) term = - let cases_tac ~term (proof, goal) = +let cases_intros_tac ?(howmany=(-1)) ?(mk_fresh_name_callback = FreshNamesGenerator.mk_fresh_name ~subst:[]) ?(pattern = PET.conclusion_pattern None) term = + let cases_tac pattern (proof, goal) = let module TC = CicTypeChecker in let module U = UriManager in let module R = CicReduction in let module C = Cic in let (curi,metasenv,_subst, proofbo,proofty, attrs) = proof in let metano,context,ty = CicUtil.lookup_meta goal metasenv in + let pattern = pattern_after_generalize_pattern_tac pattern in + let _cpattern = + match pattern with + | None, [], Some cpattern -> + let rec is_hole = + function + Cic.Implicit (Some `Hole) -> true + | Cic.Prod (Cic.Anonymous,so,tgt) -> is_hole so && is_hole tgt + | _ -> false + in + if not (is_hole cpattern) then + raise (PET.Fail (lazy "not implemented")) + | _ -> raise (PET.Fail (lazy "not implemented")) in let termty,_ = TC.type_of_aux' metasenv context term CicUniv.oblivion_ugraph in let termty = CicReduction.whd context termty in let (termty,metasenv',arguments,fresh_meta) = @@ -763,7 +955,7 @@ let cases_intros_tac ?(howmany=(-1)) ?(mk_fresh_name_callback = FreshNamesGenera right_args | _ -> assert false in - let outtype = + let outtypes = let n_right_args = List.length right_args in let n_lambdas = n_right_args + 1 in let lifted_ty = CicSubstitution.lift n_lambdas ty in @@ -793,10 +985,11 @@ let cases_intros_tac ?(howmany=(-1)) ?(mk_fresh_name_callback = FreshNamesGenera if not !replaced then (* this means the matched term is not there, * but maybe right params are: we user rels (to right args lambdas) *) - replace ~what ~with_what:(with_what false) ~where:captured + [replace ~what ~with_what:(with_what false) ~where:captured] else (* since the matched is there, rights should be inferrable *) - replace ~what ~with_what:(with_what true) ~where:captured + [replace ~what ~with_what:(with_what false) ~where:captured; + replace ~what ~with_what:(with_what true) ~where:captured] in let captured_term_ty = let term_ty = CicSubstitution.lift n_right_args termty in @@ -811,39 +1004,56 @@ let cases_intros_tac ?(howmany=(-1)) ?(mk_fresh_name_callback = FreshNamesGenera fstn [] args paramsno @ mkrels n_right_args) | _ -> raise NotAnInductiveTypeToEliminate in - let rec add_lambdas = function + let rec add_lambdas captured_ty = function | 0 -> captured_ty | 1 -> - C.Lambda (C.Name "matched", captured_term_ty, (add_lambdas 0)) + C.Lambda (C.Name "matched", captured_term_ty, (add_lambdas captured_ty 0)) | n -> C.Lambda (C.Name ("right_"^(string_of_int (n-1))), - C.Implicit None, (add_lambdas (n-1))) + C.Implicit None, (add_lambdas captured_ty (n-1))) in - add_lambdas n_lambdas - in - let term_to_refine = C.MutCase (uri,typeno,outtype,term,patterns) in - let refined_term,_,metasenv'',_ = - CicRefine.type_of_aux' metasenv' context term_to_refine - CicUniv.oblivion_ugraph - in - let new_goals = - ProofEngineHelpers.compare_metasenvs - ~oldmetasenv:metasenv ~newmetasenv:metasenv'' + List.map (fun x -> add_lambdas x n_lambdas) captured_ty in - let proof' = curi,metasenv'',_subst,proofbo,proofty, attrs in - let proof'', new_goals' = - PET.apply_tactic (apply_tac ~term:refined_term) (proof',goal) - in - (* The apply_tactic can have closed some of the new_goals *) - let patched_new_goals = - let (_,metasenv''',_subst,_,_,_) = proof'' in - List.filter - (function i -> List.exists (function (j,_,_) -> j=i) metasenv''') - new_goals @ new_goals' - in - proof'', patched_new_goals + let rec first = (* easier than using tacticals *) + function + | [] -> raise (PET.Fail (lazy ("unable to generate a working outtype"))) + | outtype::rest -> + let term_to_refine = C.MutCase (uri,typeno,outtype,term,patterns) in + try + let refined_term,_,metasenv'',_ = + CicRefine.type_of_aux' metasenv' context term_to_refine + CicUniv.oblivion_ugraph + in + let new_goals = + ProofEngineHelpers.compare_metasenvs + ~oldmetasenv:metasenv ~newmetasenv:metasenv'' + in + let proof' = curi,metasenv'',_subst,proofbo,proofty, attrs in + let proof'', new_goals' = + PET.apply_tactic (apply_tac ~term:refined_term) (proof',goal) + in + (* The apply_tactic can have closed some of the new_goals *) + let patched_new_goals = + let (_,metasenv''',_subst,_,_,_) = proof'' in + List.filter + (function i -> List.exists (function (j,_,_) -> j=i) metasenv''') + new_goals @ new_goals' + in + proof'', patched_new_goals + with PET.Fail _ | CicRefine.RefineFailure _ | CicRefine.Uncertain _ -> first rest in - PET.mk_tactic (cases_tac ~term) + first outtypes + in + let reorder_pattern ((proof, goal) as status) = + let _,metasenv,_,_,_,_ = proof in + let conjecture = CicUtil.lookup_meta goal metasenv in + let _,context,_ = conjecture in + let pattern = ProofEngineHelpers.sort_pattern_hyps context pattern in + PET.apply_tactic + (Tacticals.then_ ~start:(generalize_pattern_tac pattern) + ~continuation:(PET.mk_tactic (cases_tac pattern))) status + in + PET.mk_tactic reorder_pattern ;;