paulson@1591: (*  Title:      Pure/display.ML
paulson@1591:     ID:         $Id$
paulson@1591:     Author:     Lawrence C Paulson, Cambridge University Computer Laboratory
paulson@1591:     Copyright   1993  University of Cambridge
paulson@1591: 
paulson@1591: Printing of theories, theorems, etc.
paulson@1591: *)
paulson@1591: 
wenzelm@11883: signature BASIC_DISPLAY =
wenzelm@11883: sig
wenzelm@12081:   val goals_limit: int ref
wenzelm@11883:   val show_hyps: bool ref
wenzelm@11883:   val show_tags: bool ref
wenzelm@11883:   val string_of_thm: thm -> string
wenzelm@11883:   val print_thm: thm -> unit
wenzelm@11883:   val print_thms: thm list -> unit
wenzelm@11883:   val prth: thm -> thm
wenzelm@11883:   val prthq: thm Seq.seq -> thm Seq.seq
wenzelm@11883:   val prths: thm list -> thm list
wenzelm@11883:   val string_of_ctyp: ctyp -> string
wenzelm@11883:   val print_ctyp: ctyp -> unit
wenzelm@11883:   val string_of_cterm: cterm -> string
wenzelm@11883:   val print_cterm: cterm -> unit
wenzelm@11883:   val print_syntax: theory -> unit
wenzelm@11883:   val show_consts: bool ref
wenzelm@11883: end;
wenzelm@11883: 
paulson@1591: signature DISPLAY =
wenzelm@4950: sig
wenzelm@11883:   include BASIC_DISPLAY
wenzelm@14876:   val pretty_flexpair: Pretty.pp -> term * term -> Pretty.T
wenzelm@14876:   val pretty_thm_aux: Pretty.pp -> bool -> thm -> Pretty.T
wenzelm@6976:   val pretty_thm_no_quote: thm -> Pretty.T
wenzelm@11883:   val pretty_thm: thm -> Pretty.T
wenzelm@11883:   val pretty_thms: thm list -> Pretty.T
wenzelm@11883:   val pretty_thm_sg: Sign.sg -> thm -> Pretty.T
wenzelm@11883:   val pretty_thms_sg: Sign.sg -> thm list -> Pretty.T
wenzelm@11883:   val pprint_thm: thm -> pprint_args -> unit
wenzelm@11883:   val pretty_ctyp: ctyp -> Pretty.T
wenzelm@11883:   val pprint_ctyp: ctyp -> pprint_args -> unit
wenzelm@11883:   val pretty_cterm: cterm -> Pretty.T
wenzelm@11883:   val pprint_cterm: cterm -> pprint_args -> unit
wenzelm@11883:   val pretty_theory: theory -> Pretty.T
wenzelm@11883:   val pprint_theory: theory -> pprint_args -> unit
wenzelm@8720:   val pretty_full_theory: theory -> Pretty.T list
wenzelm@11883:   val pretty_name_space: string * NameSpace.T -> Pretty.T
wenzelm@14876:   val pretty_goals_aux: Pretty.pp -> string -> bool * bool -> int -> thm -> Pretty.T list
wenzelm@11883:   val pretty_goals: int -> thm -> Pretty.T list
wenzelm@11883:   val print_goals: int -> thm -> unit
wenzelm@11883:   val current_goals_markers: (string * string * string) ref
wenzelm@12418:   val pretty_current_goals: int -> int -> thm -> Pretty.T list
wenzelm@12418:   val print_current_goals_default: int -> int -> thm -> unit
wenzelm@12418:   val print_current_goals_fn: (int -> int -> thm -> unit) ref
wenzelm@4950: end;
paulson@1591: 
wenzelm@4950: structure Display: DISPLAY =
paulson@1591: struct
paulson@1591: 
wenzelm@11883: 
wenzelm@6087: (** print thm **)
wenzelm@6087: 
wenzelm@12081: val goals_limit = ref 10;       (*max number of goals to print -- set by user*)
wenzelm@12831: val show_hyps = ref false;      (*false: print meta-hypotheses as dots*)
wenzelm@11883: val show_tags = ref false;      (*false: suppress tags*)
wenzelm@6087: 
berghofe@14598: fun pretty_tag (name, args) = Pretty.strs (name :: map Library.quote args);
wenzelm@6087: val pretty_tags = Pretty.list "[" "]" o map pretty_tag;
paulson@1591: 
wenzelm@14876: fun pretty_flexpair pp (t, u) = Pretty.block
wenzelm@14876:   [Pretty.term pp t, Pretty.str " =?=", Pretty.brk 1, Pretty.term pp u];
berghofe@13658: 
wenzelm@14876: fun pretty_thm_aux pp quote th =
paulson@1591:   let
berghofe@13658:     val {hyps, tpairs, prop, der = (ora, _), ...} = rep_thm th;
wenzelm@6087:     val xshyps = Thm.extra_shyps th;
wenzelm@6087:     val (_, tags) = Thm.get_name_tags th;
wenzelm@6087: 
berghofe@13658:     val q = if quote then Pretty.quote else I;
wenzelm@14876:     val prt_term = q o (Pretty.term pp);
wenzelm@6279: 
berghofe@13658:     val hlen = length xshyps + length hyps + length tpairs;
paulson@1591:     val hsymbs =
wenzelm@9500:       if hlen = 0 andalso not ora then []
paulson@1591:       else if ! show_hyps then
paulson@1591:         [Pretty.brk 2, Pretty.list "[" "]"
wenzelm@14876:           (map (q o pretty_flexpair pp) tpairs @ map prt_term hyps @
wenzelm@14876:            map (Pretty.sort pp) xshyps @
wenzelm@9500:             (if ora then [Pretty.str "!"] else []))]
wenzelm@6889:       else [Pretty.brk 2, Pretty.str ("[" ^ implode (replicate hlen ".") ^
wenzelm@9500:         (if ora then "!" else "") ^ "]")];
wenzelm@6087:     val tsymbs =
wenzelm@6087:       if null tags orelse not (! show_tags) then []
wenzelm@6087:       else [Pretty.brk 1, pretty_tags tags];
wenzelm@6279:   in Pretty.block (prt_term prop :: (hsymbs @ tsymbs)) end;
paulson@1591: 
wenzelm@12067: fun gen_pretty_thm quote th =
wenzelm@14876:   pretty_thm_aux (Sign.pp (Thm.sign_of_thm th)) quote th;
wenzelm@6889: 
wenzelm@12067: val pretty_thm = gen_pretty_thm true;
wenzelm@12067: val pretty_thm_no_quote = gen_pretty_thm false;
wenzelm@6889: 
wenzelm@6889: 
paulson@1591: val string_of_thm = Pretty.string_of o pretty_thm;
wenzelm@6279: val pprint_thm = Pretty.pprint o pretty_thm;
paulson@1591: 
wenzelm@6087: fun pretty_thms [th] = pretty_thm th
wenzelm@6087:   | pretty_thms ths = Pretty.block (Pretty.fbreaks (map pretty_thm ths));
paulson@1591: 
wenzelm@10010: val pretty_thm_sg = pretty_thm oo Thm.transfer_sg;
wenzelm@10010: val pretty_thms_sg = pretty_thms oo (map o Thm.transfer_sg);
wenzelm@10010: 
wenzelm@6087: 
wenzelm@6087: (* top-level commands for printing theorems *)
wenzelm@6087: 
wenzelm@6087: val print_thm = Pretty.writeln o pretty_thm;
wenzelm@6087: val print_thms = Pretty.writeln o pretty_thms;
paulson@1591: 
paulson@1591: fun prth th = (print_thm th; th);
paulson@1591: 
paulson@1591: (*Print and return a sequence of theorems, separated by blank lines. *)
paulson@1591: fun prthq thseq =
wenzelm@4270:   (Seq.print (fn _ => print_thm) 100000 thseq; thseq);
paulson@1591: 
paulson@1591: (*Print and return a list of theorems, separated by blank lines. *)
skalberg@15570: fun prths ths = (List.app (fn th => (print_thm th; writeln "")) ths; ths);
paulson@1591: 
paulson@1591: 
paulson@1591: (* other printing commands *)
paulson@1591: 
wenzelm@4126: fun pretty_ctyp cT =
wenzelm@4126:   let val {sign, T} = rep_ctyp cT in Sign.pretty_typ sign T end;
wenzelm@4126: 
paulson@1591: fun pprint_ctyp cT =
paulson@1591:   let val {sign, T} = rep_ctyp cT in Sign.pprint_typ sign T end;
paulson@1591: 
paulson@1591: fun string_of_ctyp cT =
paulson@1591:   let val {sign, T} = rep_ctyp cT in Sign.string_of_typ sign T end;
paulson@1591: 
paulson@1591: val print_ctyp = writeln o string_of_ctyp;
paulson@1591: 
wenzelm@3547: fun pretty_cterm ct =
wenzelm@3547:   let val {sign, t, ...} = rep_cterm ct in Sign.pretty_term sign t end;
wenzelm@3547: 
paulson@1591: fun pprint_cterm ct =
paulson@1591:   let val {sign, t, ...} = rep_cterm ct in Sign.pprint_term sign t end;
paulson@1591: 
paulson@1591: fun string_of_cterm ct =
paulson@1591:   let val {sign, t, ...} = rep_cterm ct in Sign.string_of_term sign t end;
paulson@1591: 
paulson@1591: val print_cterm = writeln o string_of_cterm;
paulson@1591: 
paulson@1591: 
wenzelm@4250: 
wenzelm@4250: (** print theory **)
paulson@1591: 
wenzelm@6390: val pretty_theory = Sign.pretty_sg o Theory.sign_of;
wenzelm@6390: val pprint_theory = Sign.pprint_sg o Theory.sign_of;
paulson@1591: 
wenzelm@6390: val print_syntax = Syntax.print_syntax o Theory.syn_of;
paulson@1591: 
wenzelm@4250: 
wenzelm@4498: (* pretty_name_space  *)
wenzelm@4498: 
wenzelm@4498: fun pretty_name_space (kind, space) =
wenzelm@4498:   let
wenzelm@4498:     fun prt_entry (name, accs) = Pretty.block
berghofe@14598:       (Pretty.str (Library.quote name ^ " =") :: Pretty.brk 1 ::
berghofe@14598:         Pretty.commas (map (Pretty.quote o Pretty.str) accs));
wenzelm@4498:   in
wenzelm@4498:     Pretty.fbreaks (Pretty.str (kind ^ ":") :: map prt_entry (NameSpace.dest space))
wenzelm@4498:     |> Pretty.block
wenzelm@4498:   end;
wenzelm@4498: 
wenzelm@4498: 
wenzelm@11883: (* pretty_full_theory *)
wenzelm@4250: 
wenzelm@8720: fun pretty_full_theory thy =
wenzelm@4250:   let
wenzelm@8720:     val sg = Theory.sign_of thy;
wenzelm@8720: 
wenzelm@4250:     fun prt_cls c = Sign.pretty_sort sg [c];
wenzelm@4250:     fun prt_sort S = Sign.pretty_sort sg S;
wenzelm@4250:     fun prt_arity t (c, Ss) = Sign.pretty_arity sg (t, Ss, [c]);
wenzelm@14996:     fun prt_typ ty = Pretty.quote (Sign.pretty_typ sg ty);
wenzelm@14996:     val prt_typ_no_tvars = prt_typ o #1 o Type.freeze_thaw_type;
wenzelm@8720:     fun prt_term t = Pretty.quote (Sign.pretty_term sg t);
wenzelm@4250: 
wenzelm@14794:     fun pretty_classrel (c, []) = prt_cls c
wenzelm@14794:       | pretty_classrel (c, cs) = Pretty.block
wenzelm@14794:           (prt_cls c :: Pretty.str " <" :: Pretty.brk 1 ::
wenzelm@14794:             Pretty.commas (map prt_cls cs));
wenzelm@4250: 
wenzelm@4250:     fun pretty_default S = Pretty.block
wenzelm@14794:       [Pretty.str "default sort:", Pretty.brk 1, prt_sort S];
wenzelm@4250: 
skalberg@15531:     fun pretty_witness NONE = Pretty.str "universal non-emptiness witness: -"
skalberg@15531:       | pretty_witness (SOME (T, S)) = Pretty.block
wenzelm@14794:           [Pretty.str "universal non-emptiness witness:", Pretty.brk 1,
wenzelm@14794:             prt_typ_no_tvars T, Pretty.str " ::", Pretty.brk 1, prt_sort S];
wenzelm@14794: 
wenzelm@14996:     val tfrees = map (fn v => TFree (v, []));
wenzelm@15000:     fun pretty_type syn (t, Type.LogicalType n) =
skalberg@15531:           if syn then NONE
skalberg@15531:           else SOME (prt_typ (Type (t, tfrees (Term.invent_names [] "'a" n))))
wenzelm@15000:       | pretty_type syn (t, Type.Abbreviation (vs, U, syn')) =
skalberg@15531:           if syn <> syn' then NONE
skalberg@15531:           else SOME (Pretty.block
wenzelm@14996:             [prt_typ (Type (t, tfrees vs)), Pretty.str " =", Pretty.brk 1, prt_typ U])
wenzelm@15000:       | pretty_type syn (t, Type.Nonterminal) =
skalberg@15531:           if not syn then NONE
skalberg@15531:           else SOME (prt_typ (Type (t, [])));
wenzelm@4250: 
skalberg@15570:     val pretty_arities = List.concat o map (fn (t, ars) => map (prt_arity t) ars);
skalberg@14223: 
wenzelm@14794:     fun pretty_const (c, (ty, _)) = Pretty.block
wenzelm@10737:       [Pretty.str c, Pretty.str " ::", Pretty.brk 1, prt_typ_no_tvars ty];
wenzelm@4250: 
wenzelm@14996:     fun pretty_final (c, []) = Pretty.str c
wenzelm@14996:       | pretty_final (c, tys) = Pretty.block
wenzelm@14996:           (Pretty.str c :: Pretty.str " ::" :: Pretty.brk 1 ::
wenzelm@14996:              Pretty.commas (map prt_typ_no_tvars tys));
wenzelm@14996: 
wenzelm@8720:     fun prt_axm (a, t) = Pretty.block [Pretty.str (a ^ ":"), Pretty.brk 1, prt_term t];
wenzelm@8720: 
wenzelm@8720: 
wenzelm@14996:     val {sign = _, const_deps = _, final_consts, axioms, oracles,
wenzelm@14996:       parents = _, ancestors = _} = Theory.rep_theory thy;
wenzelm@14794:     val {self = _, tsig, consts, path, spaces, data} = Sign.rep_sg sg;
wenzelm@14794:     val {classes, default, types, arities, log_types = _, witness} = Type.rep_tsig tsig;
wenzelm@14996: 
wenzelm@14996:     val spcs = Library.sort_wrt #1 spaces;
wenzelm@15000:     val tdecls = Symtab.dest types |> map (fn (t, (d, _)) =>
wenzelm@15000:       (Sign.cond_extern sg Sign.typeK t, (t, d))) |> Library.sort_wrt #1 |> map #2;
wenzelm@14794:     val cnsts = Sign.cond_extern_table sg Sign.constK consts;
wenzelm@14996:     val finals = Sign.cond_extern_table sg Sign.constK final_consts;
wenzelm@8720:     val axms = Sign.cond_extern_table sg Theory.axiomK axioms;
wenzelm@8720:     val oras = Sign.cond_extern_table sg Theory.oracleK oracles;
wenzelm@4250:   in
wenzelm@8720:     [Pretty.strs ("stamps:" :: Sign.stamp_names_of sg),
wenzelm@8720:       Pretty.strs ("data:" :: Sign.data_kinds data),
skalberg@15570:       Pretty.strs ["name prefix:", NameSpace.pack (getOpt (path,["-"]))],
wenzelm@14996:       Pretty.big_list "name spaces:" (map pretty_name_space spcs),
wenzelm@14794:       Pretty.big_list "classes:" (map pretty_classrel (Graph.dest classes)),
wenzelm@8720:       pretty_default default,
wenzelm@14794:       pretty_witness witness,
skalberg@15570:       Pretty.big_list "syntactic types:" (List.mapPartial (pretty_type true) tdecls),
skalberg@15570:       Pretty.big_list "logical types:" (List.mapPartial (pretty_type false) tdecls),
wenzelm@14996:       Pretty.big_list "type arities:" (pretty_arities (Symtab.dest arities)),
wenzelm@14794:       Pretty.big_list "consts:" (map pretty_const cnsts),
wenzelm@14996:       Pretty.big_list "finals consts:" (map pretty_final finals),
wenzelm@8720:       Pretty.big_list "axioms:" (map prt_axm axms),
wenzelm@8720:       Pretty.strs ("oracles:" :: (map #1 oras))]
wenzelm@4250:   end;
wenzelm@4250: 
wenzelm@4250: 
wenzelm@11883: 
wenzelm@11883: (** print_goals **)
wenzelm@11883: 
wenzelm@11883: (* print_goals etc. *)
wenzelm@11883: 
wenzelm@8908: (*show consts with types in proof state output?*)
wenzelm@3851: val show_consts = ref false;
wenzelm@3851: 
paulson@1591: 
wenzelm@11883: (*print thm A1,...,An/B in "goal style" -- premises as numbered subgoals*)
wenzelm@11883: 
wenzelm@11883: local
wenzelm@11883: 
wenzelm@12081: fun ins_entry (x, y) [] = [(x, [y])]
wenzelm@12081:   | ins_entry (x, y) ((pair as (x', ys')) :: pairs) =
wenzelm@12081:       if x = x' then (x', y ins ys') :: pairs
wenzelm@12081:       else pair :: ins_entry (x, y) pairs;
wenzelm@12081: 
wenzelm@12081: fun add_consts (Const (c, T), env) = ins_entry (T, (c, T)) env
wenzelm@12081:   | add_consts (t $ u, env) = add_consts (u, add_consts (t, env))
wenzelm@12081:   | add_consts (Abs (_, _, t), env) = add_consts (t, env)
wenzelm@12081:   | add_consts (_, env) = env;
wenzelm@11883: 
wenzelm@12081: fun add_vars (Free (x, T), env) = ins_entry (T, (x, ~1)) env
wenzelm@12081:   | add_vars (Var (xi, T), env) = ins_entry (T, xi) env
wenzelm@12081:   | add_vars (Abs (_, _, t), env) = add_vars (t, env)
wenzelm@12081:   | add_vars (t $ u, env) = add_vars (u, add_vars (t, env))
wenzelm@12081:   | add_vars (_, env) = env;
wenzelm@11883: 
skalberg@15574: fun add_varsT (Type (_, Ts), env) = foldr add_varsT env Ts
wenzelm@12081:   | add_varsT (TFree (x, S), env) = ins_entry (S, (x, ~1)) env
wenzelm@12081:   | add_varsT (TVar (xi, S), env) = ins_entry (S, xi) env;
wenzelm@11883: 
paulson@14472: fun sort_idxs vs = map (apsnd (sort (prod_ord String.compare Int.compare))) vs;
wenzelm@12081: fun sort_cnsts cs = map (apsnd (sort_wrt fst)) cs;
wenzelm@12081: 
wenzelm@12081: fun consts_of t = sort_cnsts (add_consts (t, []));
wenzelm@12081: fun vars_of t = sort_idxs (add_vars (t, []));
wenzelm@12081: fun varsT_of t = rev (sort_idxs (it_term_types add_varsT (t, [])));
wenzelm@12081: 
wenzelm@12081: in
wenzelm@11883: 
wenzelm@14876: fun pretty_goals_aux pp begin_goal (msg, main) maxgoals state =
wenzelm@12081:   let
wenzelm@12081:     fun prt_atoms prt prtT (X, xs) = Pretty.block
wenzelm@12081:       [Pretty.block (Pretty.commas (map prt xs)), Pretty.str " ::",
wenzelm@12081:         Pretty.brk 1, prtT X];
wenzelm@11883: 
wenzelm@14876:     fun prt_var (x, ~1) = Pretty.term pp (Syntax.free x)
wenzelm@14876:       | prt_var xi = Pretty.term pp (Syntax.var xi);
wenzelm@12081: 
wenzelm@14876:     fun prt_varT (x, ~1) = Pretty.typ pp (TFree (x, []))
wenzelm@14876:       | prt_varT xi = Pretty.typ pp (TVar (xi, []));
wenzelm@12081: 
wenzelm@14876:     val prt_consts = prt_atoms (Pretty.term pp o Const) (Pretty.typ pp);
wenzelm@14876:     val prt_vars = prt_atoms prt_var (Pretty.typ pp);
wenzelm@14876:     val prt_varsT = prt_atoms prt_varT (Pretty.sort pp);
wenzelm@11883: 
wenzelm@11883: 
wenzelm@12081:     fun pretty_list _ _ [] = []
wenzelm@12081:       | pretty_list name prt lst = [Pretty.big_list name (map prt lst)];
wenzelm@11883: 
wenzelm@14876:     fun pretty_subgoal (n, A) = Pretty.blk (0,
wenzelm@14876:      [Pretty.str (begin_goal ^ " " ^ string_of_int n ^ ". "), Pretty.term pp A]);
wenzelm@12081:     fun pretty_subgoals As = map pretty_subgoal (1 upto length As ~~ As);
wenzelm@11883: 
wenzelm@14876:     val pretty_ffpairs = pretty_list "flex-flex pairs:" (pretty_flexpair pp);
wenzelm@11883: 
wenzelm@12081:     val pretty_consts = pretty_list "constants:" prt_consts o consts_of;
wenzelm@12081:     val pretty_vars = pretty_list "variables:" prt_vars o vars_of;
wenzelm@12081:     val pretty_varsT = pretty_list "type variables:" prt_varsT o varsT_of;
wenzelm@11883: 
wenzelm@11883: 
berghofe@13658:     val {prop, tpairs, ...} = rep_thm state;
berghofe@13658:     val (As, B) = Logic.strip_horn prop;
wenzelm@12081:     val ngoals = length As;
wenzelm@11883: 
wenzelm@12081:     fun pretty_gs (types, sorts) =
wenzelm@14876:       (if main then [Pretty.term pp B] else []) @
wenzelm@12081:        (if ngoals = 0 then [Pretty.str "No subgoals!"]
wenzelm@12081:         else if ngoals > maxgoals then
skalberg@15570:           pretty_subgoals (Library.take (maxgoals, As)) @
wenzelm@12081:           (if msg then [Pretty.str ("A total of " ^ string_of_int ngoals ^ " subgoals...")]
wenzelm@12081:            else [])
wenzelm@12081:         else pretty_subgoals As) @
wenzelm@12081:       pretty_ffpairs tpairs @
wenzelm@12081:       (if ! show_consts then pretty_consts prop else []) @
wenzelm@12081:       (if types then pretty_vars prop else []) @
wenzelm@12081:       (if sorts then pretty_varsT prop else []);
wenzelm@12081:   in
wenzelm@12081:     setmp show_no_free_types true
skalberg@14178:       (setmp show_types (! show_types orelse ! show_sorts orelse ! show_all_types)
wenzelm@12081:         (setmp show_sorts false pretty_gs))
skalberg@14178:    (! show_types orelse ! show_sorts orelse ! show_all_types, ! show_sorts)
wenzelm@11883:   end;
wenzelm@11883: 
wenzelm@12081: fun pretty_goals_marker bg n th =
wenzelm@14876:   pretty_goals_aux (Sign.pp (Thm.sign_of_thm th)) bg (true, true) n th;
wenzelm@12081: 
wenzelm@12081: val pretty_goals = pretty_goals_marker "";
wenzelm@12418: val print_goals = (Pretty.writeln o Pretty.chunks) oo pretty_goals_marker "";
wenzelm@12081: 
paulson@1591: end;
paulson@1591: 
wenzelm@11883: 
wenzelm@11883: (* print_current_goals *)
wenzelm@11883: 
wenzelm@11883: val current_goals_markers = ref ("", "", "");
wenzelm@11883: 
wenzelm@12418: fun pretty_current_goals n m th =
wenzelm@11883:   let
wenzelm@11883:     val ref (begin_state, end_state, begin_goal) = current_goals_markers;
wenzelm@11883:     val ngoals = nprems_of th;
wenzelm@11883:   in
wenzelm@12418:     (if begin_state = "" then [] else [Pretty.str begin_state]) @
wenzelm@12418:     [Pretty.str ("Level " ^ string_of_int n ^
wenzelm@11883:       (if ngoals > 0 then " (" ^ string_of_int ngoals ^ " subgoal" ^
wenzelm@11883:         (if ngoals <> 1 then "s" else "") ^ ")"
wenzelm@12418:       else ""))] @
wenzelm@12418:     pretty_goals_marker begin_goal m th @
wenzelm@12418:     (if end_state = "" then [] else [Pretty.str end_state])
wenzelm@11883:   end;
wenzelm@11883: 
wenzelm@12418: fun print_current_goals_default n m th =
wenzelm@12418:   Pretty.writeln (Pretty.chunks (pretty_current_goals n m th));
wenzelm@12418: 
wenzelm@11883: val print_current_goals_fn = ref print_current_goals_default;
wenzelm@11883: 
wenzelm@11883: end;
wenzelm@11883: 
wenzelm@11883: structure BasicDisplay: BASIC_DISPLAY = Display;
wenzelm@11883: open BasicDisplay;