let debug = true
let debug_print s = if debug then prerr_endline (Lazy.force s) else ()
-exception Error of string lazy_t
-let fail msg = raise (Error msg)
-
-type lowtac_status = {
- pstatus : NCic.obj;
- lstatus : LexiconEngine.status
-}
-
-type lowtactic = lowtac_status * int -> lowtac_status * int list * int list
-
-type tac_status = {
- gstatus : Continuationals.Stack.t;
- istatus : lowtac_status;
-}
-
-type tactic = tac_status -> tac_status
-
-type tactic_term = CicNotationPt.term Disambiguate.disambiguator_input
-
-let pp_tac_status status =
- prerr_endline (NCicPp.ppobj status.istatus.pstatus)
-;;
-
open Continuationals.Stack
+open NTacStatus
let dot_tac status =
let new_gstatus =
{ status with gstatus = new_gstatus }
;;
-let fold_tactic tac status =
+let block_tac l status =
+ List.fold_left (fun status tac -> tac status) status l
+;;
+
+let compare_statuses ~past ~present =
+ let _,_,past,_,_ = past.pstatus in
+ let _,_,present,_,_ = present.pstatus in
+ List.map fst (List.filter (fun (i,_) -> not (List.mem_assoc i past)) present),
+ List.map fst (List.filter (fun (i,_) -> not (List.mem_assoc i present)) past)
+;;
+
+
+
+(* Exec and distribute_tac form a retraction pair:
+ 1) exec (distribute_tac low_tac) (s,i) = low_tac (s,i)
+ 2) tac [s]::G = G1::...::Gn::G' && G' is G with some goals closed =>
+ distribute_tac (exec tac) [s]::G = (G1@...Gn)::G'
+ 3) tac G = distribute_tac (exec tac) G if
+ tac = distribute_tac lowtac
+
+ Note that executing an high tactic on a set of goals may be stronger
+ than executing the same tactic on those goals, but once at a time
+ (e.g. the tactic could perform a global analysis of the set of goals)
+*)
+
+let exec tac low_status g =
+ let stack = [ [0,Open g], [], [], `NoTag ] in
+ let status = tac { gstatus = stack ; istatus = low_status } in
+ status.istatus
+;;
+
+let distribute_tac tac status =
match status.gstatus with
| [] -> assert false
| (g, t, k, tag) :: s ->
match switch_of_loc loc with
| Closed _ -> fail (lazy "cannot apply to a Closed goal")
| Open n ->
- let s, go', gc' = tac (s,n) in
- s, (go @- gc') @+ go', gc @+ gc'
+ let sn = tac s n in
+ let go', gc' = compare_statuses ~past:s ~present:sn in
+ sn, (go @- gc') @+ go', gc @+ gc'
in
aux s go gc loc_tl
in
;;
-let apply t (status,goal) =
- let _,_,metasenv, subst,_ = status.pstatus in
- let _,context,gty = List.assoc goal metasenv in
- let metasenv, subst, lexicon_status, t =
- GrafiteDisambiguate.disambiguate_nterm (Some gty) status.lstatus context metasenv subst t
+let select ~where status goal =
+ let goalty = get_goalty status goal in
+ let (wanted,_,where) = GrafiteDisambiguate.disambiguate_npattern where in
+ let path =
+ match where with None -> NCic.Implicit `Term | Some where -> where
+ in
+ let status, newgoalty = select_term status goalty (wanted,path) in
+ let status, instance =
+ mk_meta status (ctx_of newgoalty) (`Decl newgoalty)
+ in
+ instantiate status goal instance
+;;
+
+let select_tac ~where = distribute_tac (select ~where) ;;
+
+let exact t status goal =
+ let goalty = get_goalty status goal in
+ let status, t = disambiguate status t (Some goalty) (ctx_of goalty) in
+ instantiate status goal t
+;;
+
+let exact_tac t = distribute_tac (exact t) ;;
+
+let reopen status =
+ let n,h,metasenv,subst,o = status.pstatus in
+ let subst, newm =
+ List.partition
+ (function (_,(Some tag,_,_,_)) ->
+ tag <> NCicMetaSubst.in_scope_tag &&
+ not (NCicMetaSubst.is_out_scope_tag tag)
+ | _ -> true)
+ subst
+ in
+ let in_m, out_m =
+ List.partition
+ (function (_,(Some tag,_,_,_)) ->
+ tag = NCicMetaSubst.in_scope_tag | _ -> assert false)
+ newm
+ in
+ let metasenv = List.map (fun (i,(_,c,_,t)) -> i,(None,c,t)) in_m @ metasenv in
+ let in_m = List.map fst in_m in
+ let out_m = match out_m with [i] -> i | _ -> assert false in
+ { status with pstatus = n,h,metasenv,subst,o }, in_m, out_m
+;;
+
+let change ~where ~with_what status goal =
+ let goalty = get_goalty status goal in
+ let (wanted,_,where) = GrafiteDisambiguate.disambiguate_npattern where in
+ let path =
+ match where with None -> NCic.Implicit `Term | Some where -> where
+ in
+ let status, newgoalty = select_term status goalty (wanted,path) in
+ let status, in_scope, out_scope = reopen status in
+ let status = List.fold_left (exact with_what) status in_scope in
+
+ let j,(n,cctx,bo,_) = out_scope in
+ let _ = typeof status (ctx_of goalty) (Obj.magic (n,cctx,bo)) in
+
+ let n,h,metasenv,subst,o = status.pstatus in
+ let subst = out_scope :: subst in
+ let status = { status with pstatus = n,h,metasenv,subst,o } in
+
+ let status, instance =
+ mk_meta status (ctx_of newgoalty) (`Decl newgoalty)
+ in
+ instantiate status goal instance
+;;
+
+let apply t status goal = exact t status goal;;
+
+let apply_tac t = distribute_tac (apply t) ;;
+let change_tac ~where ~with_what = distribute_tac (change ~where ~with_what) ;;
+
+let elim_tac ~what ~where status =
+ block_tac
+ [ select_tac ~where;
+ distribute_tac (fun status goal ->
+ let goalty = get_goalty status goal in
+ let _,_,w = what in
+ let status, what =
+ disambiguate status what None (ctx_of goalty) in
+ let _ty_what = typeof status (ctx_of what) what in
+ (* check inductive... find eliminator *)
+ let holes = [
+ CicNotationPt.Implicit;CicNotationPt.Implicit;CicNotationPt.Implicit]
+ in
+ let eliminator =
+ CicNotationPt.Appl(CicNotationPt.Ident("nat_ind",None)::holes @ [ w ])
+ in
+ exec (apply_tac ("",0,eliminator)) status goal) ]
+ status
+;;
+
+let intro_tac name =
+ exact_tac
+ ("",0,(CicNotationPt.Binder (`Lambda,
+ (CicNotationPt.Ident (name,None),None),CicNotationPt.Implicit)))
+;;
+
+let case ~what status goal =
+ let gty = get_goalty status goal in
+ let status, what = disambiguate status what None (ctx_of gty) in
+ let ty = typeof status (ctx_of what) what in
+ let ref, consno, left, right = analyse_indty status ty in
+ let t =
+ NCic.Match (ref,NCic.Implicit `Term,NCic.Rel 1,
+ HExtlib.mk_list (NCic.Implicit `Term) consno)
in
- prerr_endline ("termine disambiguato: " ^ NCicPp.ppterm ~context ~metasenv ~subst t);
- prerr_endline ("menv:" ^ NCicPp.ppmetasenv ~subst metasenv);
- prerr_endline ("subst:" ^ NCicPp.ppsubst subst ~metasenv);
- prerr_endline "fine napply";
- { status with lstatus = lexicon_status }, [goal], []
+ let ctx = ctx_of gty in
+ let status,t,ty = refine status ctx (mk_cic_term ctx t) None in
+ instantiate status goal t
;;
-let apply_tac t = fold_tactic (apply t) ;;
+let case_tac ~what = distribute_tac (case ~what);;
+let case1_tac name =
+ block_tac [ intro_tac name;
+ case_tac ~what:("",0,CicNotationPt.Ident (name,None)) ]
+;;
projects / helm.git / blobdiff