(* $Id: nCicRefiner.mli 9227 2008-11-21 16:00:06Z tassi $ *)
+let debug s = prerr_endline (Lazy.force s);;
+let debug _ = ();;
+
module COT : Set.OrderedType with type t = NCic.term * int * int =
struct
type t = NCic.term * int * int
type db = DB.t * DB.t
-let index_coercion (db_src,db_tgt) c src tgt arity arg =
+let empty_db = DB.empty,DB.empty
+
+class status =
+ object
+ val db = empty_db
+ method coerc_db = db
+ method set_coerc_db v = {< db = v >}
+ method set_coercion_status
+ : 'status. < coerc_db : db; .. > as 'status -> 'self
+ = fun o -> {< db = o#coerc_db >}
+ end
+
+let index_coercion status c src tgt arity arg =
+ let db_src,db_tgt = status#coerc_db in
let data = (c,arity,arg) in
-(*
- prerr_endline ("INDEX:" ^
+
+ debug (lazy ("INDEX:" ^
NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] src ^ " ===> " ^
NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] tgt ^ " := " ^
- NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] c);
-*)
+ NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] c ^ " " ^
+ string_of_int arg ^ " " ^ string_of_int arity));
+
let db_src = DB.index db_src src data in
let db_tgt = DB.index db_tgt tgt data in
- db_src, db_tgt
+ status#set_coerc_db (db_src, db_tgt)
;;
-let index_old_db odb db =
+let index_old_db odb (status : #status) =
List.fold_left
- (fun db (_,tgt,clist) ->
+ (fun status (_,tgt,clist) ->
List.fold_left
- (fun db (uri,_,arg) ->
+ (fun status (uri,_,arg) ->
try
let c=fst (OCic2NCic.convert_term uri (CicUtil.term_of_uri uri)) in
let arity = match tgt with | CoercDb.Fun i -> i | _ -> 0 in
NCicSubstitution.subst (NCic.Meta (-1,(0,NCic.Irl 0))) tgt
in
(*
- prerr_endline (Printf.sprintf "indicizzo %s (%d) : %s ===> %s"
+ debug (lazy (Printf.sprintf "indicizzo %s (%d)) : %s ===> %s"
(NCicPp.ppterm ~metasenv ~subst:[] ~context:[] scty) (arity+1)
(NCicPp.ppterm ~metasenv ~subst:[] ~context:[] src)
(NCicPp.ppterm ~metasenv ~subst:[] ~context:[] tgt));
*)
src, tgt
| t ->
- prerr_endline (
- NCicPp.ppterm ~metasenv ~subst:[] ~context:[] t);
+ debug (lazy (
+ NCicPp.ppterm ~metasenv ~subst:[] ~context:[] t));
assert false
in
- index_coercion db c src tgt arity arg
+ index_coercion status c src tgt arity arg
with
| NCicEnvironment.BadDependency _
- | NCicTypeChecker.TypeCheckerFailure _ -> db)
- db clist)
- db (CoercDb.to_list odb)
+ | NCicTypeChecker.TypeCheckerFailure _ -> status)
+ status clist)
+ status (CoercDb.to_list odb)
;;
-let empty_db = (DB.empty,DB.empty) ;;
-
-
-let look_for_coercion (db_src,db_tgt) metasenv subst context infty expty =
+let look_for_coercion status metasenv subst context infty expty =
+ let db_src,db_tgt = status#coerc_db in
match infty, expty with
| (NCic.Meta _ | NCic.Appl (NCic.Meta _::_)),
(NCic.Meta _ | NCic.Appl (NCic.Meta _::_)) -> []
| _ ->
-(*
- prerr_endline ("LOOK FOR COERCIONS: " ^
+
+ debug (lazy ("LOOK FOR COERCIONS: " ^
NCicPp.ppterm ~metasenv ~subst ~context infty ^ " |===> " ^
- NCicPp.ppterm ~metasenv ~subst ~context expty);
-*)
+ NCicPp.ppterm ~metasenv ~subst ~context expty));
+
let set_src = DB.retrieve_unifiables db_src infty in
let set_tgt = DB.retrieve_unifiables db_tgt expty in
let candidates = CoercionSet.inter set_src set_tgt in
-(*
- prerr_endline ("CANDIDATES: " ^
+
+ debug (lazy ("CANDIDATES: " ^
String.concat "," (List.map (fun (t,_,_) ->
NCicPp.ppterm ~metasenv ~subst ~context t)
- (CoercionSet.elements candidates)));
-*)
+ (CoercionSet.elements candidates))));
+
List.map
(fun (t,arity,arg) ->
- let ty = NCicTypeChecker.typeof ~metasenv:[] ~subst:[] [] t in
+ let ty =
+ try NCicTypeChecker.typeof ~metasenv:[] ~subst:[] [] t
+ with NCicTypeChecker.TypeCheckerFailure s ->
+ prerr_endline ("illtyped coercion: "^Lazy.force s);
+ prerr_endline (NCicPp.ppterm ~metasenv:[] ~subst:[] ~context:[] t);
+ assert false
+ in
let ty, metasenv, args =
NCicMetaSubst.saturate ~delta:max_int metasenv subst context ty arity
in
- (* prerr_endline (
+
+ debug (lazy (
NCicPp.ppterm ~metasenv ~subst:[] ~context:[] ty ^ " --- " ^
NCicPp.ppterm ~metasenv ~subst ~context
(NCicUntrusted.mk_appl t args) ^ " --- " ^
- string_of_int (List.length args) ^ " == " ^ string_of_int arg); *)
+ string_of_int (List.length args) ^ " == " ^ string_of_int arg));
+
metasenv, NCicUntrusted.mk_appl t args, ty, List.nth args arg)
(CoercionSet.elements candidates)
;;
+
+(* CSC: very inefficient implementation!
+ Enrico, can we use a discrimination tree here? *)
+let match_coercion status ~metasenv ~subst ~context t =
+ let db =
+ DB.fold (fst (status#coerc_db)) (fun _ v l -> (CoercionSet.elements v)@l) []
+ in
+ (HExtlib.list_findopt
+ (fun (p,arity,cpos) _ ->
+ try
+ let t =
+ match p,t with
+ NCic.Appl lp, NCic.Appl lt ->
+ (match fst (HExtlib.split_nth (List.length lp) lt) with
+ [t] -> t
+ | l -> NCic.Appl l)
+ | _,NCic.Appl (he::_) -> he
+ | _,_ -> t
+ in
+ let b = NCicReduction.alpha_eq metasenv subst context p t in
+ if not b then None else
+ let ty = NCicTypeChecker.typeof ~metasenv:[] ~subst:[] [] p in
+ let pis =
+ let rec aux = function NCic.Prod (_,_,t) -> 1+aux t | _ -> 0 in
+ aux ty
+ in
+ Some (p,pis - arity - cpos - 1,cpos)
+ with
+ Failure _ -> None (* raised by split_nth *)
+ ) db)
+;;
projects / helm.git / blobdiff