X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_tactics%2FnDestructTac.ml;h=7814aacfd50cf6f7409733b24640970d7a13d133;hb=8156d113837e31604dd91340f58c4dc8c155503a;hp=fd745ccf6af77330023e55aa00703b16a0d1b4ab;hpb=ab739c4972971725f59c52275a3257ebf524143f;p=helm.git diff --git a/helm/software/components/ng_tactics/nDestructTac.ml b/helm/software/components/ng_tactics/nDestructTac.ml index fd745ccf6..7814aacfd 100644 --- a/helm/software/components/ng_tactics/nDestructTac.ml +++ b/helm/software/components/ng_tactics/nDestructTac.ml @@ -28,7 +28,7 @@ open NTacStatus open Continuationals.Stack -let debug = true +let debug = false let pp = if debug then (fun x -> prerr_endline (Lazy.force x)) else (fun _ -> ()) @@ -73,7 +73,7 @@ let subst_metasenv_and_fix_names status = (* input: nome della variabile riscritta * output: lista dei nomi delle variabili il cui tipo dipende dall'input *) -let cascade_select_in_ctx ~subst ctx iname = +let cascade_select_in_ctx ~subst ctx skip iname = let lctx, rctx = HExtlib.split_nth (iname - 1) ctx in let lctx = List.rev lctx in let rec rm_last = function @@ -85,7 +85,8 @@ let cascade_select_in_ctx ~subst ctx iname = (fun (acc,context) item -> match item with | n,(NCic.Decl s | NCic.Def (s,_)) - when not (List.for_all (fun x -> NCicTypeChecker.does_not_occur ~subst context (x-1) x s) acc) -> + when (not (List.for_all (fun x -> NCicTypeChecker.does_not_occur ~subst context (x-1) x s) acc) + && not (List.mem n skip)) -> List.iter (fun m -> pp (lazy ("acc has " ^ (string_of_int m)))) acc; pp (lazy ("acc occurs in the type of " ^ n)); (1::List.map ((+) 1) acc, item::context) @@ -362,13 +363,25 @@ let discriminate_tac ~context cur_eq status = NTactics.merge_tac; print_tac (lazy "the end of discriminate")] ) status ;; + +let saturate_skip status context skip = + HExtlib.list_uniq + (List.fold_left + (fun acc x -> + let ix = HExtlib.list_index ((=) x) (List.map fst context) + in match ix with + | None -> acc + | Some (i,_) -> + fst (cascade_select_in_ctx ~subst:(get_subst status) context [] (i+1)) @ acc) skip skip) +;; -let subst_tac ~context ~dir cur_eq = - fun status -> +let subst_tac ~context ~dir skip cur_eq = + fun status as oldstatus -> let eq_name,(NCic.Decl s | NCic.Def (s,_)) = List.nth context (cur_eq-1) in let _,ctx' = HExtlib.split_nth cur_eq context in let status, s = NTacStatus.whd status ctx' (mk_cic_term ctx' s) in let status, s = term_of_cic_term status s ctx' in + let skip = saturate_skip status context skip in pp (lazy (Printf.sprintf "subst: equation %s" eq_name)); let l, r = match s with | NCic.Appl [_;_;t1;t2] | NCic.Appl [_;_;t1;_;t2] -> t1,t2 @@ -382,9 +395,12 @@ let subst_tac ~context ~dir cur_eq = let names_to_gen, _ = match var with | NCic.Rel var -> - cascade_select_in_ctx ~subst:(get_subst status) context (var+cur_eq) - | _ -> cascade_select_in_ctx ~subst:(get_subst status) context cur_eq in + cascade_select_in_ctx ~subst:(get_subst status) context skip (var+cur_eq) + | _ -> cascade_select_in_ctx ~subst:(get_subst status) context skip cur_eq in let names_to_gen = List.filter (fun n -> n <> eq_name) names_to_gen in + if (List.exists (fun x -> List.mem x skip) names_to_gen) + then oldstatus + else let gen_tac x = NTactics.generalize_tac ~where:("",0,(Some (mk_id x),[], Some CicNotationPt.UserInput)) in @@ -394,16 +410,18 @@ let subst_tac ~context ~dir cur_eq = ~what:("",0,mk_id eq_name) ~where:default_pattern; NTactics.reduce_tac ~reduction:(`Normalize true) ~where:default_pattern; - NTactics.clear_tac [eq_name]]@ + NTactics.try_tac (NTactics.clear_tac [eq_name])]@ (List.map NTactics.intro_tac (List.rev names_to_gen))) status ;; -let clearid_tac ~context cur_eq = +let clearid_tac ~context skip cur_eq = fun status -> let eq_name,(NCic.Decl s | NCic.Def (s,_)) = List.nth context (cur_eq-1) in let _,ctx' = HExtlib.split_nth cur_eq context in let status, s = NTacStatus.whd status ctx' (mk_cic_term ctx' s) in let status, s = term_of_cic_term status s ctx' in + let skip = saturate_skip status context skip in + (* let streicher_id = match s with | NCic.Appl [_;_;_;_] -> mk_id "streicherK" @@ -431,6 +449,63 @@ let clearid_tac ~context cur_eq = | [] -> [] | _::tl -> tl in List.map NTactics.intro_tac names_to_intro)) status +*) + + pp (lazy (Printf.sprintf "clearid: equation %s" eq_name)); + match s with + | NCic.Appl [_;_;_;_] -> + (* leibniz *) + let streicher_id = mk_id "streicherK" + in + let names_to_gen, _ = + cascade_select_in_ctx ~subst:(get_subst status) context skip cur_eq in + let names_to_gen = names_to_gen @ [eq_name] in + let gen_tac x = + NTactics.generalize_tac + ~where:("",0,(Some (mk_id x),[], Some CicNotationPt.UserInput)) in + NTactics.block_tac ((List.map gen_tac names_to_gen)@ + [NTactics.clear_tac names_to_gen; + NTactics.apply_tac ("",0, mk_appl [streicher_id; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne]); + NTactics.reduce_tac ~reduction:(`Normalize true) + ~where:default_pattern] @ + (let names_to_intro = + match List.rev names_to_gen with + | [] -> [] + | _::tl -> tl in + List.map NTactics.intro_tac names_to_intro)) status + | NCic.Appl [_;_;_;_;_] -> + (* JMeq *) + let streicher_id = mk_id "streicherK" + in + let names_to_gen, _ = + cascade_select_in_ctx ~subst:(get_subst status) context skip cur_eq in + let names_to_gen = names_to_gen (* @ [eq_name]*) in + let gen_tac x = + NTactics.generalize_tac + ~where:("",0,(Some (mk_id x),[], Some CicNotationPt.UserInput)) in + let gen_eq = NTactics.generalize_tac + ~where:("",0,(Some (mk_appl [mk_id "jmeq_to_eq"; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne; + mk_id eq_name]),[], Some CicNotationPt.UserInput)) in + NTactics.block_tac ((List.map gen_tac names_to_gen)@gen_eq:: + [NTactics.clear_tac names_to_gen; + NTactics.try_tac (NTactics.clear_tac [eq_name]); + NTactics.apply_tac ("",0, mk_appl [streicher_id; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne; + CicNotationPt.Implicit `JustOne]); + NTactics.reduce_tac ~reduction:(`Normalize true) + ~where:default_pattern] @ + (let names_to_intro = List.rev names_to_gen in + List.map NTactics.intro_tac names_to_intro)) status + | _ -> assert false ;; let get_ctx st goal = @@ -438,7 +513,7 @@ let get_ctx st goal = ;; (* = select + classify *) -let select_eq ctx acc status goal = +let select_eq ctx acc domain status goal = let classify ~subst ctx' l r = (* FIXME: metasenv *) if NCicReduction.are_convertible ~metasenv:[] ~subst ctx' l r @@ -487,14 +562,15 @@ let select_eq ctx acc status goal = status, Some (List.length ctx - i), kind | `Cycle | `Blob | `NonEq -> aux (i+1) (* XXX: skip cyclic/blob equations for now *) | _ -> - if (List.for_all (fun x -> x <> n) acc) then - status, Some (List.length ctx - i), kind + if (List.for_all (fun x -> x <> n) acc) && + (List.exists (fun x -> x = n) domain) + then status, Some (List.length ctx - i), kind else aux (i+1)) with Failure _ | Invalid_argument _ -> status, None, `Blob in aux 0 ;; -let rec destruct_tac0 nprods acc status goal = +let rec destruct_tac0 nprods acc domain skip status goal = let ctx = get_ctx status goal in let subst = get_subst status in let get_newgoal os ns ogoal = @@ -502,33 +578,56 @@ let rec destruct_tac0 nprods acc status goal = let go' = ([ogoal] @- gc) @+ go in match go' with [] -> assert false | g::_ -> g in - let status, selection, kind = select_eq ctx acc status goal in + let status, selection, kind = select_eq ctx acc domain status goal in pp (lazy ("destruct: acc is " ^ String.concat "," acc )); match selection, kind with | None, _ -> pp (lazy (Printf.sprintf "destruct: nprods is %d, no selection, context is %s" nprods (NCicPp.ppcontext ~metasenv:[] ~subst ctx))); - if nprods > 0 then - let status' = NTactics.exec (NTactics.intro_tac (mk_fresh_name ctx 'e' 0)) status goal in - destruct_tac0 (nprods-1) acc status' (get_newgoal status status' goal) + if nprods > 0 then + let fresh = mk_fresh_name ctx 'e' 0 in + let status' = NTactics.exec (NTactics.intro_tac fresh) status goal in + destruct_tac0 (nprods-1) acc (fresh::domain) skip status' (get_newgoal status status' goal) else status | Some cur_eq, `Discriminate (newprods,conflict) -> pp (lazy (Printf.sprintf "destruct: discriminate - nprods is %d, selection is %d, context is %s" nprods cur_eq (NCicPp.ppcontext ~metasenv:[] ~subst ctx))); let status' = NTactics.exec (discriminate_tac ~context:ctx cur_eq) status goal in if conflict then status' - else destruct_tac0 (nprods+newprods) - (name_of_rel ~context:ctx cur_eq::acc) status' (get_newgoal status status' goal) + else + destruct_tac0 (nprods+newprods) + (name_of_rel ~context:ctx cur_eq::acc) + (List.filter (fun x -> x <> name_of_rel ~context:ctx cur_eq) domain) + skip + status' (get_newgoal status status' goal) | Some cur_eq, `Subst dir -> pp (lazy (Printf.sprintf "destruct: subst - nprods is %d, selection is %d, context is %s" nprods cur_eq (NCicPp.ppcontext ~metasenv:[] ~subst ctx))); - let status' = NTactics.exec (subst_tac ~context:ctx ~dir cur_eq) status goal in + let status' = NTactics.exec (subst_tac ~context:ctx ~dir skip cur_eq) status goal in pp (lazy (Printf.sprintf " ctx after subst = %s" (NCicPp.ppcontext ~metasenv:[] ~subst (get_ctx status' (get_newgoal status status' goal))))); let eq_name,_ = List.nth ctx (cur_eq-1) in - destruct_tac0 nprods (List.filter (fun x -> x <> eq_name) acc) status' (get_newgoal status status' goal) - | Some cur_eq, `Identity -> + let newgoal = get_newgoal status status' goal in + let has_cleared = + try + let _ = NTactics.find_in_context eq_name (get_ctx status' newgoal) in false + with _ -> true in + let rm_eq b l = if b then List.filter (fun x -> x <> eq_name) l else l in + let acc = rm_eq has_cleared acc in + let skip = rm_eq has_cleared skip in + let domain = rm_eq has_cleared domain in + destruct_tac0 nprods acc domain skip status' newgoal + | Some cur_eq, `Identity -> pp (lazy (Printf.sprintf "destruct: identity - nprods is %d, selection is %d, context is %s" nprods cur_eq (NCicPp.ppcontext ~metasenv:[] ~subst ctx))); let eq_name,_ = List.nth ctx (cur_eq-1) in - let status' = NTactics.exec (clearid_tac ~context:ctx cur_eq) status goal in - destruct_tac0 nprods (List.filter (fun x -> x <> eq_name) acc) status' (get_newgoal status status' goal) + let status' = NTactics.exec (clearid_tac ~context:ctx skip cur_eq) status goal in + let newgoal = get_newgoal status status' goal in + let has_cleared = + try + let _ = NTactics.find_in_context eq_name (get_ctx status' newgoal) in false + with _ -> true in + let rm_eq b l = if b then List.filter (fun x -> x <> eq_name) l else l in + let acc = rm_eq has_cleared acc in + let skip = rm_eq has_cleared skip in + let domain = rm_eq has_cleared domain in + destruct_tac0 nprods acc domain skip status' newgoal | Some cur_eq, `Cycle -> (* TODO, should never happen *) pp (lazy (Printf.sprintf "destruct: cycle - nprods is %d, selection is %d, context is %s" nprods cur_eq (NCicPp.ppcontext ~metasenv:[] ~subst ctx))); assert false @@ -538,4 +637,12 @@ let rec destruct_tac0 nprods acc status goal = | _ -> assert false ;; -let destruct_tac s = NTactics.distribute_tac (destruct_tac0 0 []) s;; +let destruct_tac dom skip s = + NTactics.distribute_tac + (fun s' g -> + let ctx = get_ctx s' g in + let domain = match dom with + | None -> List.map (fun (n,_) -> n) ctx + | Some l -> l + in + destruct_tac0 0 [] domain skip s' g) s;;