X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Ftactics%2FeliminationTactics.ml;h=d05826ec0a514e962278afa6e69952bd8df919f7;hb=428ab5496e9c6d4d95642963df08952722b9cf0e;hp=e98bcd3c878d6fa597ffda35b85a4ee2e0d4d906;hpb=7f2444c2670cadafddd8785b687ef312158376b0;p=helm.git diff --git a/components/tactics/eliminationTactics.ml b/components/tactics/eliminationTactics.ml index e98bcd3c8..d05826ec0 100644 --- a/components/tactics/eliminationTactics.ml +++ b/components/tactics/eliminationTactics.ml @@ -32,44 +32,37 @@ module S = ProofEngineStructuralRules module F = FreshNamesGenerator module E = ProofEngineTypes module H = ProofEngineHelpers +module R = ReductionTactics (* -let induction_tac ~term status = - let (proof, goal) = status in - let module C = Cic in - let module R = CicReduction in - let module P = PrimitiveTactics in - let module T = Tacticals in - let module S = ProofEngineStructuralRules in - let module U = UriManager in - let (_,metasenv,_,_) = proof in - let _,context,ty = CicUtil.lookup_meta goal metasenv in - let termty = CicTypeChecker.type_of_aux' metasenv context term in (* per ora non serve *) - - T.then_ ~start:(T.repeat_tactic - ~tactic:(T.then_ ~start:(VariousTactics.generalize_tac ~term) (* chissa' se cosi' funziona? *) - ~continuation:(P.intros)) - ~continuation:(P.elim_intros_simpl ~term) - status -;; +(* search in term the Inductive Types and return a list of uris as triples like this: (uri,typeno,exp_named_subst) *) +let search_inductive_types ty = + let rec aux types = function + | C.MutInd (uri, typeno, _) when (not (List.mem (uri, typeno) types)) -> + (uri, typeno) :: types + | C.Appl applist -> List.fold_left aux types applist + | _ -> types + in + aux [] ty +(* N.B: in un caso tipo (and A forall C:Prop.(or B C)) l'or *non* viene selezionato! *) *) (* unexported tactics *******************************************************) -let get_name context index = - try match List.nth context (pred index) with - | Some (Cic.Name name, _) -> Some name - | _ -> None - with Invalid_argument "List.nth" -> None +type type_class = Other + | Ind + | Con of C.lazy_term + +let premise_pattern what = None, [what, C.Implicit (Some `Hole)], None let rec scan_tac ~old_context_length ~index ~tactic = let scan_tac status = let (proof, goal) = status in - let _, metasenv, _, _ = proof in + let _, metasenv, _, _, _ = proof in let _, context, _ = CicUtil.lookup_meta goal metasenv in let context_length = List.length context in let rec aux index = - match get_name context index with + match H.get_name context index with | _ when index <= 0 -> (proof, [goal]) | None -> aux (pred index) | Some what -> @@ -78,29 +71,37 @@ let rec scan_tac ~old_context_length ~index ~tactic = in try E.apply_tactic tac status with E.Fail _ -> aux (pred index) - in aux (index + context_length - old_context_length - 1) + in aux (index + context_length - old_context_length) in E.mk_tactic scan_tac -let rec check_inductive_types types = function - | C.MutInd (uri, typeno, _) -> List.mem (uri, typeno) types - | C.Appl (hd :: tl) -> check_inductive_types types hd - | _ -> false +let rec check_types types = function + | C.MutInd (uri, typeno, _) -> + if List.mem (uri, Some typeno) types then Ind else Other + | C.Const (uri, _) as t -> + if List.mem (uri, None) types then Con (E.const_lazy_term t) else Other + | C.Appl (hd :: tl) -> check_types types hd + | _ -> Other -let elim_clear_tac ~mk_fresh_name_callback ~types ~what = - let elim_clear_tac status = +let elim_clear_unfold_tac ~mk_fresh_name_callback ~types ~what = + let elim_clear_unfold_tac status = let (proof, goal) = status in - let _, metasenv, _, _ = proof in + let _, metasenv, _, _, _ = proof in let _, context, _ = CicUtil.lookup_meta goal metasenv in let index, ty = H.lookup_type metasenv context what in - if check_inductive_types types ty then - let tac = T.then_ ~start:(P.elim_intros_tac ~mk_fresh_name_callback (C.Rel index)) - ~continuation:(S.clear what) - in - E.apply_tactic tac status - else raise (E.Fail (lazy "unexported elim_clear: not an eliminable type")) + match check_types types ty with + | Ind -> + let tac = T.then_ ~start:(P.elim_intros_tac ~mk_fresh_name_callback (C.Rel index)) + ~continuation:(S.clear [what]) + in + E.apply_tactic tac status + | Con t -> + let tac = R.unfold_tac (Some t) ~pattern:(premise_pattern what) in + E.apply_tactic tac status + | Other -> + raise (E.Fail (lazy "unexported elim_clear: not an eliminable type")) in - E.mk_tactic elim_clear_tac + E.mk_tactic elim_clear_unfold_tac (* elim type ****************************************************************) @@ -129,89 +130,24 @@ let debug_print = fun _ -> () (** debugging print *) let warn s = debug_print (lazy ("DECOMPOSE: " ^ (Lazy.force s))) -(* search in term the Inductive Types and return a list of uris as triples like this: (uri,typeno,exp_named_subst) *) -let search_inductive_types ty = - let rec aux types = function - | C.MutInd (uri, typeno, _) when (not (List.mem (uri, typeno) types)) -> - (uri, typeno) :: types - | C.Appl applist -> List.fold_left aux types applist - | _ -> types - in - aux [] ty -(* N.B: in un caso tipo (and A forall C:Prop.(or B C)) l'or *non* viene selezionato! *) - (* roba seria ------------------------------------------------------------- *) let decompose_tac ?(mk_fresh_name_callback = F.mk_fresh_name ~subst:[]) - ?(user_types=[]) ~dbd what = + ?(user_types=[]) ?what ~dbd = let decompose_tac status = let (proof, goal) = status in - let _, metasenv,_,_ = proof in + let _, metasenv,_,_, _ = proof in let _, context, _ = CicUtil.lookup_meta goal metasenv in let types = List.rev_append user_types (FwdQueries.decomposables dbd) in - let tactic = elim_clear_tac ~mk_fresh_name_callback ~types in - let old_context_length = List.length context in - let tac = T.then_ ~start:(tactic ~what) - ~continuation:(scan_tac ~old_context_length ~index:1 ~tactic) + let tactic = elim_clear_unfold_tac ~mk_fresh_name_callback ~types in + let old_context_length = List.length context in + let tac = match what with + | Some what -> + T.then_ ~start:(tactic ~what) + ~continuation:(scan_tac ~old_context_length ~index:1 ~tactic) + | None -> + scan_tac ~old_context_length ~index:old_context_length ~tactic in E.apply_tactic tac status in E.mk_tactic decompose_tac - -(* -module R = CicReduction - - let rec elim_clear_tac ~term' ~nr_of_hyp_still_to_elim status = - let (proof, goal) = status in - warn (lazy ("nr_of_hyp_still_to_elim=" ^ (string_of_int nr_of_hyp_still_to_elim))); - if nr_of_hyp_still_to_elim <> 0 then - let _,metasenv,_,_ = proof in - let _,context,_ = CicUtil.lookup_meta goal metasenv in - let old_context_len = List.length context in - let termty,_ = - CicTypeChecker.type_of_aux' metasenv context term' - CicUniv.empty_ugraph in - warn (lazy ("elim_clear termty= " ^ CicPp.ppterm termty)); - match termty with - C.MutInd (uri,typeno,exp_named_subst) - | C.Appl((C.MutInd (uri,typeno,exp_named_subst))::_) - when (List.mem (uri,typeno,exp_named_subst) urilist) -> - warn (lazy ("elim " ^ CicPp.ppterm termty)); - ProofEngineTypes.apply_tactic - (T.then_ - ~start:(P.elim_intros_simpl_tac term') - ~continuation:( - (* clear the hyp that has just been eliminated *) - ProofEngineTypes.mk_tactic (fun status -> - let (proof, goal) = status in - let _,metasenv,_,_ = proof in - let _,context,_ = CicUtil.lookup_meta goal metasenv in - let new_context_len = List.length context in - warn (lazy ("newcon=" ^ (string_of_int new_context_len) ^ " & oldcon=" ^ (string_of_int old_context_len) ^ " & old_nr_of_hyp=" ^ (string_of_int nr_of_hyp_still_to_elim))); - let new_nr_of_hyp_still_to_elim = nr_of_hyp_still_to_elim + (new_context_len - old_context_len) - 1 in - let hyp_name = - match List.nth context new_nr_of_hyp_still_to_elim with - None - | Some (Cic.Anonymous,_) -> assert false - | Some (Cic.Name name,_) -> name - in - ProofEngineTypes.apply_tactic - (T.then_ - ~start:( - if (term'==term) (* if it's the first application of elim, there's no need to clear the hyp *) - then begin debug_print (lazy ("%%%%%%% no clear")); T.id_tac end - else begin debug_print (lazy ("%%%%%%% clear " ^ (string_of_int (new_nr_of_hyp_still_to_elim)))); (S.clear ~hyp:hyp_name) end) - ~continuation:(ProofEngineTypes.mk_tactic (elim_clear_tac ~term':(C.Rel new_nr_of_hyp_still_to_elim) ~nr_of_hyp_still_to_elim:new_nr_of_hyp_still_to_elim))) - status - ))) - status - | _ -> - let new_nr_of_hyp_still_to_elim = nr_of_hyp_still_to_elim - 1 in - warn (lazy ("fail; hyp=" ^ (string_of_int new_nr_of_hyp_still_to_elim))); - elim_clear_tac ~term':(C.Rel new_nr_of_hyp_still_to_elim) ~nr_of_hyp_still_to_elim:new_nr_of_hyp_still_to_elim status - else (* no hyp to elim left in this goal *) - ProofEngineTypes.apply_tactic T.id_tac status - - in - elim_clear_tac ~term':term ~nr_of_hyp_still_to_elim:1 status -*)