subst
;;
-
+
+exception MatchingFailure;;
+
+let matching metasenv context t1 t2 ugraph =
+ try
+ let subst, metasenv, ugraph =
+ CicUnification.fo_unif metasenv context t1 t2 ugraph
+ in
+ let t' = CicMetaSubst.apply_subst subst t1 in
+ if not (meta_convertibility t1 t') then
+ raise MatchingFailure
+ else
+ let metas = metas_of_term t1 in
+ let fix_subst = function
+ | (i, (c, Cic.Meta (j, lc), ty)) when List.mem i metas ->
+ (j, (c, Cic.Meta (i, lc), ty))
+ | s -> s
+ in
+ let subst = List.map fix_subst subst in
+ subst, metasenv, ugraph
+ with e ->
+ raise MatchingFailure
+;;
+
+
let beta_expand ?(metas_ok=true) ?(match_only=false)
what type_of_what where context metasenv ugraph =
let module S = CicSubstitution in
let subst', metasenv', ugraph' =
(* Printf.printf "provo a unificare %s e %s\n" *)
(* (CicPp.ppterm (S.lift lift_amount what)) (CicPp.ppterm term); *)
- CicUnification.fo_unif metasenv context
- (S.lift lift_amount what) term ugraph
+ if match_only then
+ matching metasenv context term (S.lift lift_amount what)ugraph
+ else
+ CicUnification.fo_unif metasenv context
+ (S.lift lift_amount what) term ugraph
in
(* Printf.printf "Ok, trovato: %s\n\nwhat: %s" (CicPp.ppterm term) *)
(* (CicPp.ppterm (S.lift lift_amount what)); *)
(* Printf.printf "substitution:\n%s\n\n" (print_subst subst'); *)
(* Printf.printf "metasenv': %s\n" (print_metasenv metasenv'); *)
(* Printf.printf "metasenv: %s\n\n" (print_metasenv metasenv); *)
- if match_only then
- let t' = CicMetaSubst.apply_subst subst' term in
- if not (meta_convertibility term t') then (
-(* if print_info then ( *)
-(* let names = names_of_context context in *)
-(* Printf.printf *)
-(* "\nbeta_expand: term e t' sono diversi!:\n%s\n%s\n\n" *)
-(* (CicPp.pp term names) (CicPp.pp t' names) *)
-(* ); *)
- res, lifted_term
- ) else (
- let metas = metas_of_term term in
-(* let ok = ref false in *)
- let fix_subst = function
- | (i, (c, C.Meta (j, lc), ty)) when List.mem i metas ->
-(* Printf.printf "fix_subst: scambio ?%d e ?%d\n" i j; *)
-(* ok := true; *)
- (j, (c, C.Meta (i, lc), ty))
- | s -> s
- in
- let subst' = List.map fix_subst subst' in
-(* if !ok then ( *)
-(* Printf.printf "aaa:\nterm: %s\nt'%s\n term subst': %s\n" *)
-(* (CicPp.ppterm term) *)
-(* (CicPp.ppterm t') *)
-(* (CicPp.ppterm (CicMetaSubst.apply_subst subst' term)) *)
-(* ); *)
- ((C.Rel (1 + lift_amount), subst', metasenv', ugraph')::res,
- lifted_term)
- )
-(* ((C.Rel (1 + lift_amount), restore_subst context subst', *)
-(* metasenv', ugraph')::res, lifted_term) *)
- else
+(* if match_only then *)
+(* let t' = CicMetaSubst.apply_subst subst' term in *)
+(* if not (meta_convertibility term t') then ( *)
+(* res, lifted_term *)
+(* ) else ( *)
+(* let metas = metas_of_term term in *)
+(* let fix_subst = function *)
+(* | (i, (c, C.Meta (j, lc), ty)) when List.mem i metas -> *)
+(* (j, (c, C.Meta (i, lc), ty)) *)
+(* | s -> s *)
+(* in *)
+(* let subst' = List.map fix_subst subst' in *)
+(* ((C.Rel (1 + lift_amount), subst', metasenv', ugraph')::res, *)
+(* lifted_term) *)
+(* ) *)
+(* else *)
((C.Rel (1 + lift_amount), subst', metasenv', ugraph')::res,
lifted_term)
with e ->
*)
+let subsumption env target source =
+ let _, (ty, tl, tr), tmetas, _ = target
+ and _, (ty', sl, sr), smetas, _ = source in
+ if ty <> ty' then
+ false
+ else
+ let metasenv, context, ugraph = env in
+ let metasenv = metasenv @ tmetas @ smetas in
+ let names = names_of_context context in
+ let samesubst subst subst' =
+(* Printf.printf "samesubst:\nsubst: %s\nsubst': %s\n" *)
+(* (print_subst subst) (print_subst subst'); *)
+(* print_newline (); *)
+ let tbl = Hashtbl.create (List.length subst) in
+ List.iter (fun (m, (c, t1, t2)) -> Hashtbl.add tbl m (c, t1, t2)) subst;
+ List.for_all
+ (fun (m, (c, t1, t2)) ->
+ try
+ let c', t1', t2' = Hashtbl.find tbl m in
+ if (c = c') && (t1 = t1') && (t2 = t2') then true
+ else false
+ with Not_found ->
+ true)
+ subst'
+ in
+ let subsaux left right left' right' =
+ try
+ let subst, menv, ug = matching metasenv context left left' ugraph
+ and subst', menv', ug' = matching metasenv context right right' ugraph
+ in
+(* Printf.printf "left = right: %s = %s\n" *)
+(* (CicPp.pp left names) (CicPp.pp right names); *)
+(* Printf.printf "left' = right': %s = %s\n" *)
+(* (CicPp.pp left' names) (CicPp.pp right' names); *)
+ samesubst subst subst'
+ with e ->
+(* print_endline (Printexc.to_string e); *)
+ false
+ in
+ let res =
+ if subsaux tl tr sl sr then true
+ else subsaux tl tr sr sl
+ in
+ if res then (
+ Printf.printf "subsumption!:\ntarget: %s\nsource: %s\n"
+ (string_of_equality ~env target) (string_of_equality ~env source);
+ print_newline ();
+ );
+ res
+;;