src/Pure/Isar/isar_thy.ML
author wenzelm
Mon Jul 12 22:29:38 1999 +0200 (1999-07-12 ago)
changeset 6986 82a4ac9c6b03
parent 6952 0f7e8d42902b
child 7002 01a4e15ee253
permissions -rw-r--r--
local qeds: print rule;
     1 (*  Title:      Pure/Isar/isar_thy.ML
     2     ID:         $Id$
     3     Author:     Markus Wenzel, TU Muenchen
     4 
     5 Pure/Isar derived theory operations.
     6 *)
     7 
     8 signature ISAR_THY =
     9 sig
    10   val add_txt: Comment.text -> ProofHistory.T -> ProofHistory.T
    11   val add_text: Comment.text -> theory -> theory
    12   val add_title: Comment.text -> Comment.text -> Comment.text -> theory -> theory
    13   val add_chapter: Comment.text -> theory -> theory
    14   val add_section: Comment.text -> theory -> theory
    15   val add_subsection: Comment.text -> theory -> theory
    16   val add_subsubsection: Comment.text -> theory -> theory
    17   val add_classes: (bclass * xclass list) list * Comment.text -> theory -> theory
    18   val add_classes_i: (bclass * class list) list * Comment.text  -> theory -> theory
    19   val add_classrel: (xclass * xclass) * Comment.text -> theory -> theory
    20   val add_classrel_i: (class * class) * Comment.text -> theory -> theory
    21   val add_defsort: xsort * Comment.text -> theory -> theory
    22   val add_defsort_i: sort * Comment.text -> theory -> theory
    23   val add_nonterminals: (bstring * Comment.text) list -> theory -> theory
    24   val add_tyabbrs: ((bstring * string list * string * mixfix) * Comment.text) list
    25     -> theory -> theory
    26   val add_tyabbrs_i: ((bstring * string list * typ * mixfix) * Comment.text) list
    27     -> theory -> theory
    28   val add_arities: ((xstring * xsort list * xsort) * Comment.text) list -> theory -> theory
    29   val add_arities_i: ((string * sort list * sort) * Comment.text) list -> theory -> theory
    30   val add_typedecl: (bstring * string list * mixfix) * Comment.text -> theory -> theory
    31   val add_consts: ((bstring * string * mixfix) * Comment.text) list -> theory -> theory
    32   val add_consts_i: ((bstring * typ * mixfix) * Comment.text) list -> theory -> theory
    33   val add_modesyntax: string * bool -> ((bstring * string * mixfix) * Comment.text) list
    34     -> theory -> theory
    35   val add_modesyntax_i: string * bool -> ((bstring * typ * mixfix) * Comment.text) list
    36     -> theory -> theory
    37   val add_trrules: ((xstring * string) Syntax.trrule * Comment.text) list -> theory -> theory
    38   val add_trrules_i: (Syntax.ast Syntax.trrule * Comment.text) list -> theory -> theory
    39   val add_axioms: (((bstring * string) * Args.src list) * Comment.text) list -> theory -> theory
    40   val add_axioms_i: (((bstring * term) * theory attribute list) * Comment.text) list
    41     -> theory -> theory
    42   val add_defs: (((bstring * string) * Args.src list) * Comment.text) list -> theory -> theory
    43   val add_defs_i: (((bstring * term) * theory attribute list) * Comment.text) list
    44     -> theory -> theory
    45   val add_constdefs: (((bstring * string * mixfix) * Comment.text) * (string * Comment.text)) list
    46     -> theory -> theory
    47   val add_constdefs_i: (((bstring * typ * mixfix) * Comment.text) * (term * Comment.text)) list
    48     -> theory -> theory
    49   val apply_theorems: (xstring * Args.src list) list -> theory -> theory * thm list
    50   val apply_theorems_i: (thm * theory attribute list) list -> theory -> theory * thm list
    51   val have_theorems: ((bstring * Args.src list) * (xstring * Args.src list) list) * Comment.text
    52     -> theory -> theory
    53   val have_theorems_i: ((bstring * theory attribute list) * (thm * theory attribute list) list)
    54     * Comment.text -> theory -> theory
    55   val have_lemmas: ((bstring * Args.src list) * (xstring * Args.src list) list) * Comment.text
    56     -> theory -> theory
    57   val have_lemmas_i: ((bstring * theory attribute list) * (thm * theory attribute list) list)
    58     * Comment.text -> theory -> theory
    59   val have_facts: ((string * Args.src list) * (string * Args.src list) list) * Comment.text
    60     -> ProofHistory.T -> ProofHistory.T
    61   val have_facts_i: ((string * Proof.context attribute list) *
    62     (thm * Proof.context attribute list) list) * Comment.text -> ProofHistory.T -> ProofHistory.T
    63   val from_facts: (string * Args.src list) list * Comment.text -> ProofHistory.T -> ProofHistory.T
    64   val from_facts_i: (thm * Proof.context attribute list) list * Comment.text
    65     -> ProofHistory.T -> ProofHistory.T
    66   val with_facts: (string * Args.src list) list * Comment.text -> ProofHistory.T -> ProofHistory.T
    67   val with_facts_i: (thm * Proof.context attribute list) list * Comment.text
    68     -> ProofHistory.T -> ProofHistory.T
    69   val chain: Comment.text -> ProofHistory.T -> ProofHistory.T
    70   val export_chain: Comment.text -> ProofHistory.T -> ProofHistory.T
    71   val fix: (string * string option) list * Comment.text -> ProofHistory.T -> ProofHistory.T
    72   val fix_i: (string * typ) list * Comment.text -> ProofHistory.T -> ProofHistory.T
    73   val match_bind: ((string list * string) * Comment.text) list -> ProofHistory.T -> ProofHistory.T
    74   val match_bind_i: ((term list * term) * Comment.text) list -> ProofHistory.T -> ProofHistory.T
    75   val theorem: (bstring * Args.src list * (string * (string list * string list)))
    76     * Comment.text -> bool -> theory -> ProofHistory.T
    77   val theorem_i: (bstring * theory attribute list * (term * (term list * term list)))
    78     * Comment.text -> bool -> theory -> ProofHistory.T
    79   val lemma: (bstring * Args.src list * (string * (string list * string list)))
    80     * Comment.text -> bool -> theory -> ProofHistory.T
    81   val lemma_i: (bstring * theory attribute list * (term * (term list * term list)))
    82     * Comment.text -> bool -> theory -> ProofHistory.T
    83   val assume: (string * Args.src list * (string * (string list * string list)) list)
    84     * Comment.text -> ProofHistory.T -> ProofHistory.T
    85   val assume_i: (string * Proof.context attribute list * (term * (term list * term list)) list)
    86     * Comment.text -> ProofHistory.T -> ProofHistory.T
    87   val presume: (string * Args.src list * (string * (string list * string list)) list)
    88     * Comment.text -> ProofHistory.T -> ProofHistory.T
    89   val presume_i: (string * Proof.context attribute list * (term * (term list * term list)) list)
    90     * Comment.text -> ProofHistory.T -> ProofHistory.T
    91   val local_def: (string * Args.src list * ((string * string option) * (string * string list)))
    92     * Comment.text -> ProofHistory.T -> ProofHistory.T
    93   val local_def_i: (string * Args.src list * ((string * typ) * (term * term list)))
    94     * Comment.text -> ProofHistory.T -> ProofHistory.T
    95   val show: (string * Args.src list * (string * (string list * string list)))
    96     * Comment.text -> ProofHistory.T -> ProofHistory.T
    97   val show_i: (string * Proof.context attribute list * (term * (term list * term list)))
    98     * Comment.text -> ProofHistory.T -> ProofHistory.T
    99   val have: (string * Args.src list * (string * (string list * string list)))
   100     * Comment.text -> ProofHistory.T -> ProofHistory.T
   101   val have_i: (string * Proof.context attribute list * (term * (term list * term list)))
   102     * Comment.text -> ProofHistory.T -> ProofHistory.T
   103   val thus: (string * Args.src list * (string * (string list * string list)))
   104     * Comment.text -> ProofHistory.T -> ProofHistory.T
   105   val thus_i: (string * Proof.context attribute list * (term * (term list * term list)))
   106     * Comment.text -> ProofHistory.T -> ProofHistory.T
   107   val hence: (string * Args.src list * (string * (string list * string list)))
   108     * Comment.text -> ProofHistory.T -> ProofHistory.T
   109   val hence_i: (string * Proof.context attribute list * (term * (term list * term list)))
   110     * Comment.text -> ProofHistory.T -> ProofHistory.T
   111   val begin_block: ProofHistory.T -> ProofHistory.T
   112   val next_block: ProofHistory.T -> ProofHistory.T
   113   val end_block: ProofHistory.T -> ProofHistory.T
   114   val tac: Method.text -> ProofHistory.T -> ProofHistory.T
   115   val then_tac: Method.text -> ProofHistory.T -> ProofHistory.T
   116   val proof: Comment.interest * (Method.text * Comment.interest) option
   117     -> ProofHistory.T -> ProofHistory.T
   118   val kill_proof: ProofHistory.T -> theory
   119   val qed: (Method.text * Comment.interest) option -> Toplevel.transition -> Toplevel.transition
   120   val terminal_proof: (Method.text * Comment.interest) * (Method.text * Comment.interest) option
   121     -> Toplevel.transition -> Toplevel.transition
   122   val immediate_proof: Toplevel.transition -> Toplevel.transition
   123   val default_proof: Toplevel.transition -> Toplevel.transition
   124   val skip_proof: Toplevel.transition -> Toplevel.transition
   125   val also: ((string * Args.src list) list * Comment.interest) option * Comment.text
   126     -> Toplevel.transition -> Toplevel.transition
   127   val also_i: (thm list * Comment.interest) option * Comment.text
   128     -> Toplevel.transition -> Toplevel.transition
   129   val finally: ((string * Args.src list) list * Comment.interest) option * Comment.text
   130     -> Toplevel.transition -> Toplevel.transition
   131   val finally_i: (thm list * Comment.interest) option * Comment.text
   132     -> Toplevel.transition -> Toplevel.transition
   133   val use_mltext: string -> theory option -> theory option
   134   val use_mltext_theory: string -> theory -> theory
   135   val use_setup: string -> theory -> theory
   136   val parse_ast_translation: string -> theory -> theory
   137   val parse_translation: string -> theory -> theory
   138   val print_translation: string -> theory -> theory
   139   val typed_print_translation: string -> theory -> theory
   140   val print_ast_translation: string -> theory -> theory
   141   val token_translation: string -> theory -> theory
   142   val add_oracle: (bstring * string) * Comment.text -> theory -> theory
   143   val begin_theory: string -> string list -> (string * bool) list -> theory
   144   val end_theory: theory -> theory
   145   val theory: string * string list * (string * bool) list
   146     -> Toplevel.transition -> Toplevel.transition
   147   val context: string -> Toplevel.transition -> Toplevel.transition
   148   val update_context: string -> Toplevel.transition -> Toplevel.transition
   149 end;
   150 
   151 structure IsarThy: ISAR_THY =
   152 struct
   153 
   154 
   155 (** derived theory and proof operations **)
   156 
   157 (* formal comments *)
   158 
   159 fun add_txt comment = ProofHistory.apply Proof.assert_forward;
   160 fun add_text comment thy = thy;
   161 fun add_title title author date thy = thy;
   162 val add_chapter = add_text;
   163 val add_section = add_text;
   164 val add_subsection = add_text;
   165 val add_subsubsection = add_text;
   166 
   167 
   168 (* signature and syntax *)
   169 
   170 val add_classes = Theory.add_classes o Comment.ignore;
   171 val add_classes_i = Theory.add_classes_i o Comment.ignore;
   172 val add_classrel = Theory.add_classrel o single o Comment.ignore;
   173 val add_classrel_i = Theory.add_classrel_i o single o Comment.ignore;
   174 val add_defsort = Theory.add_defsort o Comment.ignore;
   175 val add_defsort_i = Theory.add_defsort_i o Comment.ignore;
   176 val add_nonterminals = Theory.add_nonterminals o map Comment.ignore;
   177 val add_tyabbrs = Theory.add_tyabbrs o map Comment.ignore;
   178 val add_tyabbrs_i = Theory.add_tyabbrs_i o map Comment.ignore;
   179 val add_arities = Theory.add_arities o map Comment.ignore;
   180 val add_arities_i = Theory.add_arities_i o map Comment.ignore;
   181 val add_typedecl = PureThy.add_typedecls o single o Comment.ignore;
   182 val add_consts = Theory.add_consts o map Comment.ignore;
   183 val add_consts_i = Theory.add_consts_i o map Comment.ignore;
   184 fun add_modesyntax mode = Theory.add_modesyntax mode o map Comment.ignore;
   185 fun add_modesyntax_i mode = Theory.add_modesyntax_i mode o map Comment.ignore;
   186 val add_trrules = Theory.add_trrules o map Comment.ignore;
   187 val add_trrules_i = Theory.add_trrules_i o map Comment.ignore;
   188 
   189 
   190 
   191 (* axioms and defs *)
   192 
   193 fun add_axms f args thy =
   194   f (map (fn (x, srcs) => (x, map (Attrib.global_attribute thy) srcs)) args) thy;
   195 
   196 val add_axioms = add_axms PureThy.add_axioms o map Comment.ignore;
   197 val add_axioms_i = PureThy.add_axioms_i o map Comment.ignore;
   198 val add_defs = add_axms PureThy.add_defs o map Comment.ignore;
   199 val add_defs_i = PureThy.add_defs_i o map Comment.ignore;
   200 
   201 
   202 (* constdefs *)
   203 
   204 fun gen_add_constdefs consts defs args thy =
   205   thy
   206   |> consts (map (Comment.ignore o fst) args)
   207   |> defs (map (fn (((c, _, mx), _), (s, _)) =>
   208     (((Thm.def_name (Syntax.const_name c mx), s), []), Comment.none)) args);
   209 
   210 fun add_constdefs args = gen_add_constdefs Theory.add_consts add_defs args;
   211 fun add_constdefs_i args = gen_add_constdefs Theory.add_consts_i add_defs_i args;
   212 
   213 
   214 (* theorems *)
   215 
   216 fun gen_have_thmss get attrib f ((name, more_srcs), th_srcs) x =
   217   f name (map (attrib x) more_srcs)
   218     (map (fn (s, srcs) => (get x s, map (attrib x) srcs)) th_srcs) x;
   219 
   220 fun global_have_thmss x = gen_have_thmss PureThy.get_thms Attrib.global_attribute x;
   221 
   222 fun local_have_thmss x =
   223   gen_have_thmss (ProofContext.get_thms o Proof.context_of)
   224     (Attrib.local_attribute o Proof.theory_of) x;
   225 
   226 fun have_thmss_i f ((name, more_atts), th_atts) =
   227   f name more_atts (map (apfst single) th_atts);
   228 
   229 fun have_lemss name atts = PureThy.have_thmss name (atts @ [Drule.tag_lemma]);
   230 
   231 
   232 fun apply_theorems th_srcs = global_have_thmss PureThy.have_thmss ((None, []), th_srcs);
   233 fun apply_theorems_i th_srcs = have_thmss_i PureThy.have_thmss ((None, []), th_srcs);
   234 val have_theorems = #1 oo (global_have_thmss (PureThy.have_thmss o Some) o Comment.ignore);
   235 val have_theorems_i = #1 oo (have_thmss_i (PureThy.have_thmss o Some) o Comment.ignore);
   236 val have_lemmas = #1 oo (global_have_thmss (have_lemss o Some) o Comment.ignore);
   237 val have_lemmas_i = #1 oo (have_thmss_i (have_lemss o Some) o Comment.ignore);
   238 val have_facts = ProofHistory.apply o local_have_thmss (Proof.have_thmss []) o Comment.ignore;
   239 val have_facts_i = ProofHistory.apply o have_thmss_i (Proof.have_thmss []) o Comment.ignore;
   240 
   241 
   242 (* forward chaining *)
   243 
   244 fun gen_from_facts f = ProofHistory.apply o (Proof.chain oo curry f ("", []));
   245 
   246 fun add_thmss name atts ths_atts state =
   247   Proof.have_thmss (Proof.the_facts state) name atts ths_atts state;
   248 
   249 val from_facts = gen_from_facts (local_have_thmss (Proof.have_thmss [])) o Comment.ignore;
   250 val from_facts_i = gen_from_facts (have_thmss_i (Proof.have_thmss [])) o Comment.ignore;
   251 val with_facts = gen_from_facts (local_have_thmss add_thmss) o Comment.ignore;
   252 val with_facts_i = gen_from_facts (have_thmss_i add_thmss) o Comment.ignore;
   253 
   254 fun chain comment_ignore = ProofHistory.apply Proof.chain;
   255 fun export_chain comment_ignore = ProofHistory.applys Proof.export_chain;
   256 
   257 
   258 (* context *)
   259 
   260 val fix = ProofHistory.apply o Proof.fix o Comment.ignore;
   261 val fix_i = ProofHistory.apply o Proof.fix_i o Comment.ignore;
   262 val match_bind = ProofHistory.apply o Proof.match_bind o map Comment.ignore;
   263 val match_bind_i = ProofHistory.apply o Proof.match_bind_i o map Comment.ignore;
   264 
   265 
   266 (* statements *)
   267 
   268 fun global_statement f (name, src, s) int thy =
   269   ProofHistory.init (Toplevel.undo_limit int)
   270     (f name (map (Attrib.global_attribute thy) src) s thy);
   271 
   272 fun global_statement_i f (name, atts, t) int thy =
   273   ProofHistory.init (Toplevel.undo_limit int) (f name atts t thy);
   274 
   275 fun local_statement f g (name, src, s) = ProofHistory.apply (fn state =>
   276   f name (map (Attrib.local_attribute (Proof.theory_of state)) src) s (g state));
   277 
   278 fun local_statement_i f g (name, atts, t) = ProofHistory.apply (f name atts t o g);
   279 
   280 val theorem     = global_statement Proof.theorem o Comment.ignore;
   281 val theorem_i   = global_statement_i Proof.theorem_i o Comment.ignore;
   282 val lemma       = global_statement Proof.lemma o Comment.ignore;
   283 val lemma_i     = global_statement_i Proof.lemma_i o Comment.ignore;
   284 val assume      = local_statement Proof.assume I o Comment.ignore;
   285 val assume_i    = local_statement_i Proof.assume_i I o Comment.ignore;
   286 val presume     = local_statement Proof.presume I o Comment.ignore;
   287 val presume_i   = local_statement_i Proof.presume_i I o Comment.ignore;
   288 val local_def   = local_statement LocalDefs.def I o Comment.ignore;
   289 val local_def_i = local_statement LocalDefs.def_i I o Comment.ignore;
   290 val show        = local_statement Proof.show I o Comment.ignore;
   291 val show_i      = local_statement_i Proof.show_i I o Comment.ignore;
   292 val have        = local_statement Proof.have I o Comment.ignore;
   293 val have_i      = local_statement_i Proof.have_i I o Comment.ignore;
   294 val thus        = local_statement Proof.show Proof.chain o Comment.ignore;
   295 val thus_i      = local_statement_i Proof.show_i Proof.chain o Comment.ignore;
   296 val hence       = local_statement Proof.have Proof.chain o Comment.ignore;
   297 val hence_i     = local_statement_i Proof.have_i Proof.chain o Comment.ignore;
   298 
   299 
   300 (* blocks *)
   301 
   302 val begin_block = ProofHistory.apply Proof.begin_block;
   303 val next_block = ProofHistory.apply Proof.next_block;
   304 val end_block = ProofHistory.applys Proof.end_block;
   305 
   306 
   307 (* backward steps *)
   308 
   309 val tac = ProofHistory.applys o Method.tac;
   310 val then_tac = ProofHistory.applys o Method.then_tac;
   311 
   312 val proof =
   313   ProofHistory.applys o Method.proof o apsome Comment.ignore_interest o Comment.ignore_interest';
   314 
   315 
   316 (* print result *)
   317 
   318 fun pretty_result {kind, name, thm} =
   319   Pretty.block [Pretty.str (kind ^ " " ^ name ^ ":"), Pretty.fbrk, Proof.pretty_thm thm];
   320 
   321 fun pretty_rule thm =
   322   Pretty.block [Pretty.str "solving goal by rule:", Pretty.fbrk, Proof.pretty_thm thm];
   323 
   324 val print_result = Pretty.writeln o pretty_result;
   325 
   326 fun cond_print_result_rule int =
   327   if int then (print_result, Pretty.writeln o pretty_rule)
   328   else (K (), K ());
   329 
   330 fun proof'' f = Toplevel.proof' (f o cond_print_result_rule);
   331 
   332 
   333 (* local endings *)
   334 
   335 val local_qed =
   336   proof'' o (ProofHistory.applys oo Method.local_qed) o apsome Comment.ignore_interest;
   337 
   338 fun ignore_interests (x, y) = (Comment.ignore_interest x, apsome Comment.ignore_interest y);
   339 
   340 val local_terminal_proof =
   341   proof'' o (ProofHistory.applys oo Method.local_terminal_proof) o ignore_interests;
   342 
   343 val local_immediate_proof = proof'' (ProofHistory.applys o Method.local_immediate_proof);
   344 val local_default_proof = proof'' (ProofHistory.applys o Method.local_default_proof);
   345 val local_skip_proof = proof'' (ProofHistory.applys o SkipProof.local_skip_proof);
   346 
   347 
   348 (* global endings *)
   349 
   350 val kill_proof = Proof.theory_of o ProofHistory.current;
   351 
   352 fun global_result finish = Toplevel.proof_to_theory (fn prf =>
   353   let
   354     val state = ProofHistory.current prf;
   355     val _ = if Proof.at_bottom state then () else raise Toplevel.UNDEF;
   356     val (thy, res) = finish state;
   357   in print_result res; thy end);
   358 
   359 val global_qed = global_result o Method.global_qed o apsome Comment.ignore_interest;
   360 val global_terminal_proof = global_result o Method.global_terminal_proof o ignore_interests;
   361 val global_immediate_proof = global_result Method.global_immediate_proof;
   362 val global_default_proof = global_result Method.global_default_proof;
   363 val global_skip_proof = global_result SkipProof.global_skip_proof;
   364 
   365 
   366 (* common endings *)
   367 
   368 fun qed meth = local_qed meth o global_qed meth;
   369 fun terminal_proof meths = local_terminal_proof meths o global_terminal_proof meths;
   370 val immediate_proof = local_immediate_proof o global_immediate_proof;
   371 val default_proof = local_default_proof o global_default_proof;
   372 val skip_proof = local_skip_proof o global_skip_proof;
   373 
   374 
   375 (* calculational proof commands *)
   376 
   377 local
   378 
   379 fun cond_print_calc int thm =
   380   if int then Pretty.writeln (Pretty.big_list "calculation:" [Proof.pretty_thm thm])
   381   else ();
   382 
   383 fun proof''' f = Toplevel.proof' (f o cond_print_calc);
   384 
   385 fun get_thmss srcs = Proof.the_facts o local_have_thmss (Proof.have_thmss []) (("", []), srcs); 
   386 fun get_thmss_i thms _ = thms;
   387 
   388 fun gen_calc get f (args, _) prt state =
   389   f (apsome (fn (srcs, _) => get srcs state) args) prt state;
   390 
   391 in
   392 
   393 fun also x = proof''' (ProofHistory.applys o gen_calc get_thmss Calculation.also x);
   394 fun also_i x = proof''' (ProofHistory.applys o gen_calc get_thmss_i Calculation.also x);
   395 fun finally x = proof''' (ProofHistory.applys o gen_calc get_thmss Calculation.finally x);
   396 fun finally_i x = proof''' (ProofHistory.applys o gen_calc get_thmss_i Calculation.finally x);
   397 
   398 end;
   399 
   400 
   401 (* use ML text *)
   402 
   403 fun use_mltext txt opt_thy = #2 (Context.pass opt_thy (use_text false) txt);
   404 fun use_mltext_theory txt thy = #2 (Context.pass_theory thy (use_text false) txt);
   405 
   406 fun use_context txt = use_mltext_theory ("Context.>> (" ^ txt ^ ");");
   407 
   408 fun use_let name body txt =
   409   use_context ("let val " ^ name ^ " = " ^ txt ^ " in\n" ^ body ^ " end");
   410 
   411 val use_setup =
   412   use_let "setup: (theory -> theory) list" "Library.apply setup";
   413 
   414 
   415 (* translation functions *)
   416 
   417 val parse_ast_translation =
   418   use_let "parse_ast_translation: (string * (Syntax.ast list -> Syntax.ast)) list"
   419     "Theory.add_trfuns (parse_ast_translation, [], [], [])";
   420 
   421 val parse_translation =
   422   use_let "parse_translation: (string * (term list -> term)) list"
   423     "Theory.add_trfuns ([], parse_translation, [], [])";
   424 
   425 val print_translation =
   426   use_let "print_translation: (string * (term list -> term)) list"
   427     "Theory.add_trfuns ([], [], print_translation, [])";
   428 
   429 val print_ast_translation =
   430   use_let "print_ast_translation: (string * (Syntax.ast list -> Syntax.ast)) list"
   431     "Theory.add_trfuns ([], [], [], print_ast_translation)";
   432 
   433 val typed_print_translation =
   434   use_let "typed_print_translation: (string * (bool -> typ -> term list -> term)) list"
   435     "Theory.add_trfunsT typed_print_translation";
   436 
   437 val token_translation =
   438   use_let "token_translation: (string * string * (string -> string * int)) list"
   439     "Theory.add_tokentrfuns token_translation";
   440 
   441 
   442 (* add_oracle *)
   443 
   444 fun add_oracle ((name, txt), comment_ignore) =
   445   use_let
   446     "oracle: bstring * (Sign.sg * Object.T -> term)"
   447     "Theory.add_oracle oracle"
   448     ("(" ^ quote name ^ ", " ^ txt ^ ")");
   449 
   450 
   451 (* theory init and exit *)
   452 
   453 fun begin_theory name parents files =
   454   let
   455     val paths = map (apfst Path.unpack) files;
   456     val thy = ThyInfo.begin_theory name parents paths;
   457   in Present.begin_theory name parents paths thy end;
   458 
   459 fun end_theory thy =
   460   (Present.end_theory (PureThy.get_name thy); ThyInfo.end_theory thy);
   461 
   462 fun kill_theory thy = ThyInfo.remove_thy (PureThy.get_name thy);
   463 
   464 fun bg_theory (name, parents, files) () = begin_theory name parents files;
   465 fun en_theory thy = (end_theory thy; ());
   466 
   467 fun theory spec = Toplevel.init_theory (bg_theory spec) en_theory kill_theory;
   468 
   469 
   470 (* context switch *)
   471 
   472 fun switch_theory load s =
   473   Toplevel.init_theory (fn () => (the (#2 (Context.pass None load s)))) (K ()) (K ());
   474 
   475 val context = switch_theory ThyInfo.use_thy;
   476 val update_context = switch_theory ThyInfo.update_thy;
   477 
   478 
   479 end;