module PEH = ProofEngineHelpers
module ET = EqualityTactics
module DTI = DoubleTypeInference
-module FNG = FreshNamesGenerator
-let debug = true
+let debug = false
let debug_print =
if debug then (fun x -> prerr_endline (Lazy.force x)) else (fun _ -> ())
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 recur_on_child_tac ~before ~after =
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 tactic = T.then_ ~start:before ~continuation:(after lterm) in
+ PET.apply_tactic tactic status
in
PET.mk_tactic recur_on_child
-and injection_tac ~lterm ~i ~continuation =
+let injection_tac ~lterm ~i ~continuation ~recur =
let give_name seed = function
| C.Name _ as name -> name
| C.Anonymous -> C.Name (incr seed; "y" ^ string_of_int !seed)
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 recur;
fill_cut_tac term
]
in
in
PET.mk_tactic injection_tac
-and subst_tac ~lterm ~direction ~where ~continuation =
+let subst_tac ~lterm ~direction ~where ~continuation ~recur =
let subst_tac status =
let (proof, goal) = status in
let _,metasenv,_subst,_,_, _ = proof in
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 recur in
T.if_ ~start ~continuation:ok_tactic ~fail:continuation
in
PET.apply_tactic tactic status
in
PET.mk_tactic subst_tac
-and destruct ?(simplified = false) ~first_time term =
+let rec destruct ~first_time lterm =
let are_convertible hd1 hd2 metasenv context =
fst (CR.are_convertible ~metasenv context hd1 hd2 CU.empty_ugraph)
in
+ let recur = destruct ~first_time:false in
let destruct status =
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 ~recur
+ | 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) ~recur
+ ~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
if are_convertible hd1 hd2 metasenv context then
traverse_list first_time (succ i) tl1 tl2
else
- injection_tac ~i ~lterm ~continuation:
+ injection_tac ~i ~lterm ~recur ~continuation:
(traverse_list false (succ i) tl1 tl2)
| _ -> assert false
(* i 2 termini hanno in testa lo stesso costruttore,
| _, C.Rel i2 when DTI.does_not_occur i2 t1 ->
mk_subst_chain `RightToLeft i2 t1 t2
(* else part *)
- | _ when first_time && simplified -> raise exn_nothingtodo
- | _ when simplified (* && not first time *) -> T.id_tac
- | _ (* when not simplified *) ->
- T.then_ ~start:(simpl_in_term context term)
- ~continuation:(destruct ~simplified:true ~first_time term)
+ | _ when first_time -> raise exn_nothingtodo
+ | _ (* when not first time *) -> T.id_tac
end
- | _ when first_time && simplified -> raise exn_nothingtodo
- | _ when simplified (* && not first time *) -> T.id_tac
- | _ (* when not simplified *) ->
- T.then_ ~start:(simpl_in_term context term)
- ~continuation:(destruct ~simplified:true ~first_time term)
- in
- PET.apply_tactic tac status
+ | _ when first_time -> raise exn_nothingtodo
+ | _ (* when not first time *) -> T.id_tac
+ 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 xterms =
+ 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 xterms with
+ | Some terms ->
+ let map term = destruct ~first_time:false (mk_lterm term) in
+ List.map map terms
+ | 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
projects / helm.git / blobdiff