src/Pure/Isar/toplevel.ML
author wenzelm
Thu Jan 24 23:51:22 2008 +0100 (2008-01-24)
changeset 25960 1f9956e0bd89
parent 25847 713519ba6860
child 26081 fbdb1161b4b0
permissions -rw-r--r--
removed unused properties;
replaced ContextPosition by Position.thread_data;
wenzelm@5828
     1
(*  Title:      Pure/Isar/toplevel.ML
wenzelm@5828
     2
    ID:         $Id$
wenzelm@5828
     3
    Author:     Markus Wenzel, TU Muenchen
wenzelm@5828
     4
wenzelm@5828
     5
The Isabelle/Isar toplevel.
wenzelm@5828
     6
*)
wenzelm@5828
     7
wenzelm@5828
     8
signature TOPLEVEL =
wenzelm@5828
     9
sig
wenzelm@19063
    10
  exception UNDEF
wenzelm@20963
    11
  type generic_theory
wenzelm@18589
    12
  type node
wenzelm@20963
    13
  val theory_node: node -> generic_theory option
wenzelm@18589
    14
  val proof_node: node -> ProofHistory.T option
wenzelm@20963
    15
  val cases_node: (generic_theory -> 'a) -> (Proof.state -> 'a) -> node -> 'a
wenzelm@20963
    16
  val presentation_context: node option -> xstring option -> Proof.context
wenzelm@5828
    17
  type state
wenzelm@7732
    18
  val is_toplevel: state -> bool
wenzelm@18589
    19
  val is_theory: state -> bool
wenzelm@18589
    20
  val is_proof: state -> bool
wenzelm@17076
    21
  val level: state -> int
wenzelm@6689
    22
  val node_history_of: state -> node History.T
wenzelm@5828
    23
  val node_of: state -> node
wenzelm@20963
    24
  val node_case: (generic_theory -> 'a) -> (Proof.state -> 'a) -> state -> 'a
wenzelm@21506
    25
  val context_of: state -> Proof.context
wenzelm@22089
    26
  val generic_theory_of: state -> generic_theory
wenzelm@5828
    27
  val theory_of: state -> theory
wenzelm@5828
    28
  val proof_of: state -> Proof.state
wenzelm@18589
    29
  val proof_position_of: state -> int
wenzelm@21007
    30
  val enter_proof_body: state -> Proof.state
wenzelm@16815
    31
  val print_state_context: state -> unit
wenzelm@16815
    32
  val print_state: bool -> state -> unit
wenzelm@16682
    33
  val quiet: bool ref
wenzelm@16682
    34
  val debug: bool ref
wenzelm@17321
    35
  val interact: bool ref
wenzelm@16682
    36
  val timing: bool ref
wenzelm@16682
    37
  val profiling: int ref
wenzelm@16815
    38
  val skip_proofs: bool ref
wenzelm@25584
    39
  val crashes: exn list ref
wenzelm@5828
    40
  exception TERMINATE
wenzelm@5990
    41
  exception RESTART
wenzelm@24055
    42
  exception TOPLEVEL_ERROR
wenzelm@20128
    43
  val exn_message: exn -> string
wenzelm@20128
    44
  val program: (unit -> 'a) -> 'a
wenzelm@16682
    45
  type transition
wenzelm@6689
    46
  val undo_limit: bool -> int option
wenzelm@5828
    47
  val empty: transition
wenzelm@14923
    48
  val name_of: transition -> string
wenzelm@14923
    49
  val source_of: transition -> OuterLex.token list option
wenzelm@5828
    50
  val name: string -> transition -> transition
wenzelm@5828
    51
  val position: Position.T -> transition -> transition
wenzelm@14923
    52
  val source: OuterLex.token list -> transition -> transition
wenzelm@5828
    53
  val interactive: bool -> transition -> transition
wenzelm@5828
    54
  val print: transition -> transition
wenzelm@16607
    55
  val print': string -> transition -> transition
wenzelm@17363
    56
  val three_buffersN: string
wenzelm@17363
    57
  val print3: transition -> transition
wenzelm@9010
    58
  val no_timing: transition -> transition
wenzelm@22056
    59
  val init_theory: (bool -> theory) -> (theory -> unit) -> (theory -> unit) ->
wenzelm@22056
    60
    transition -> transition
wenzelm@25441
    61
  val init_empty: (state -> bool) -> (unit -> unit) -> transition -> transition
wenzelm@6689
    62
  val exit: transition -> transition
wenzelm@21958
    63
  val undo_exit: transition -> transition
wenzelm@6689
    64
  val kill: transition -> transition
wenzelm@20128
    65
  val history: (node History.T -> node History.T) -> transition -> transition
wenzelm@5828
    66
  val keep: (state -> unit) -> transition -> transition
wenzelm@7612
    67
  val keep': (bool -> state -> unit) -> transition -> transition
wenzelm@5828
    68
  val imperative: (unit -> unit) -> transition -> transition
wenzelm@5828
    69
  val theory: (theory -> theory) -> transition -> transition
wenzelm@7612
    70
  val theory': (bool -> theory -> theory) -> transition -> transition
wenzelm@20985
    71
  val begin_local_theory: bool -> (theory -> local_theory) -> transition -> transition
wenzelm@21007
    72
  val end_local_theory: transition -> transition
wenzelm@20963
    73
  val local_theory: xstring option -> (local_theory -> local_theory) -> transition -> transition
wenzelm@20963
    74
  val present_local_theory: xstring option -> (bool -> node -> unit) -> transition -> transition
berghofe@24453
    75
  val local_theory_to_proof': xstring option -> (bool -> local_theory -> Proof.state) ->
berghofe@24453
    76
    transition -> transition
wenzelm@21007
    77
  val local_theory_to_proof: xstring option -> (local_theory -> Proof.state) ->
wenzelm@21007
    78
    transition -> transition
wenzelm@17363
    79
  val theory_to_proof: (theory -> Proof.state) -> transition -> transition
wenzelm@21007
    80
  val end_proof: (bool -> Proof.state -> Proof.context) -> transition -> transition
wenzelm@21007
    81
  val forget_proof: transition -> transition
wenzelm@21177
    82
  val present_proof: (bool -> node -> unit) -> transition -> transition
wenzelm@21177
    83
  val proofs': (bool -> Proof.state -> Proof.state Seq.seq) -> transition -> transition
wenzelm@17904
    84
  val proof': (bool -> Proof.state -> Proof.state) -> transition -> transition
wenzelm@21177
    85
  val proofs: (Proof.state -> Proof.state Seq.seq) -> transition -> transition
wenzelm@21177
    86
  val proof: (Proof.state -> Proof.state) -> transition -> transition
wenzelm@16815
    87
  val actual_proof: (ProofHistory.T -> ProofHistory.T) -> transition -> transition
wenzelm@16815
    88
  val skip_proof: (int History.T -> int History.T) -> transition -> transition
wenzelm@17904
    89
  val skip_proof_to_theory: (int -> bool) -> transition -> transition
wenzelm@9512
    90
  val unknown_theory: transition -> transition
wenzelm@9512
    91
  val unknown_proof: transition -> transition
wenzelm@9512
    92
  val unknown_context: transition -> transition
wenzelm@17076
    93
  val present_excursion: (transition * (state -> state -> 'a -> 'a)) list -> 'a -> 'a
wenzelm@5828
    94
  val excursion: transition list -> unit
wenzelm@5828
    95
  val set_state: state -> unit
wenzelm@5828
    96
  val get_state: unit -> state
wenzelm@5828
    97
  val exn: unit -> (exn * string) option
wenzelm@5828
    98
  val >> : transition -> bool
wenzelm@14985
    99
  val >>> : transition list -> unit
wenzelm@21958
   100
  val init_state: unit -> unit
nipkow@14091
   101
  type 'a isar
wenzelm@25527
   102
  val loop: bool -> 'a isar -> unit
wenzelm@5828
   103
end;
wenzelm@5828
   104
wenzelm@6965
   105
structure Toplevel: TOPLEVEL =
wenzelm@5828
   106
struct
wenzelm@5828
   107
wenzelm@21958
   108
wenzelm@5828
   109
(** toplevel state **)
wenzelm@5828
   110
wenzelm@19063
   111
exception UNDEF;
wenzelm@19063
   112
wenzelm@19063
   113
wenzelm@21294
   114
(* local theory wrappers *)
wenzelm@5828
   115
wenzelm@20963
   116
type generic_theory = Context.generic;    (*theory or local_theory*)
wenzelm@20963
   117
wenzelm@25292
   118
val loc_init = TheoryTarget.context;
wenzelm@21294
   119
val loc_exit = ProofContext.theory_of o LocalTheory.exit;
wenzelm@21294
   120
wenzelm@25292
   121
fun loc_begin loc (Context.Theory thy) = loc_init (the_default "-" loc) thy
wenzelm@21294
   122
  | loc_begin NONE (Context.Proof lthy) = lthy
haftmann@25269
   123
  | loc_begin (SOME loc) (Context.Proof lthy) = loc_init loc (loc_exit lthy);
wenzelm@21294
   124
wenzelm@21294
   125
fun loc_finish _ (Context.Theory _) = Context.Theory o loc_exit
wenzelm@21294
   126
  | loc_finish NONE (Context.Proof _) = Context.Proof o LocalTheory.restore
wenzelm@25292
   127
  | loc_finish (SOME _) (Context.Proof lthy) = fn lthy' =>
wenzelm@25292
   128
      Context.Proof (LocalTheory.reinit (LocalTheory.raw_theory (K (loc_exit lthy')) lthy));
wenzelm@21294
   129
wenzelm@21294
   130
wenzelm@21958
   131
(* datatype node *)
wenzelm@21294
   132
wenzelm@5828
   133
datatype node =
wenzelm@20963
   134
  Theory of generic_theory * Proof.context option | (*theory with presentation context*)
wenzelm@21007
   135
  Proof of ProofHistory.T * ((Proof.context -> generic_theory) * generic_theory) |
wenzelm@21007
   136
    (*history of proof states, finish, original theory*)
wenzelm@21007
   137
  SkipProof of int History.T * (generic_theory * generic_theory);
wenzelm@18563
   138
    (*history of proof depths, resulting theory, original theory*)
wenzelm@5828
   139
wenzelm@22056
   140
val the_global_theory = fn Theory (Context.Theory thy, _) => thy | _ => raise UNDEF;
wenzelm@20963
   141
val theory_node = fn Theory (gthy, _) => SOME gthy | _ => NONE;
wenzelm@18589
   142
val proof_node = fn Proof (prf, _) => SOME prf | _ => NONE;
wenzelm@18589
   143
wenzelm@20963
   144
fun cases_node f _ (Theory (gthy, _)) = f gthy
wenzelm@19063
   145
  | cases_node _ g (Proof (prf, _)) = g (ProofHistory.current prf)
wenzelm@21007
   146
  | cases_node f _ (SkipProof (_, (gthy, _))) = f gthy;
wenzelm@19063
   147
wenzelm@20963
   148
fun presentation_context (SOME (Theory (_, SOME ctxt))) NONE = ctxt
wenzelm@20963
   149
  | presentation_context (SOME node) NONE = cases_node Context.proof_of Proof.context_of node
wenzelm@20963
   150
  | presentation_context (SOME node) (SOME loc) =
haftmann@25269
   151
      loc_init loc (cases_node Context.theory_of Proof.theory_of node)
wenzelm@20963
   152
  | presentation_context NONE _ = raise UNDEF;
wenzelm@19063
   153
wenzelm@21958
   154
wenzelm@21958
   155
(* datatype state *)
wenzelm@21958
   156
wenzelm@22056
   157
type state_info = node History.T * ((theory -> unit) * (theory -> unit));
wenzelm@5828
   158
wenzelm@21958
   159
datatype state =
wenzelm@21958
   160
  Toplevel of state_info option |  (*outer toplevel, leftover end state*)
wenzelm@21958
   161
  State of state_info;
wenzelm@5828
   162
wenzelm@21958
   163
val toplevel = Toplevel NONE;
wenzelm@21958
   164
wenzelm@21958
   165
fun is_toplevel (Toplevel _) = true
wenzelm@7732
   166
  | is_toplevel _ = false;
wenzelm@7732
   167
wenzelm@21958
   168
fun level (Toplevel _) = 0
wenzelm@21958
   169
  | level (State (node, _)) =
wenzelm@17076
   170
      (case History.current node of
wenzelm@21310
   171
        Theory _ => 0
wenzelm@21310
   172
      | Proof (prf, _) => Proof.level (ProofHistory.current prf)
wenzelm@21310
   173
      | SkipProof (h, _) => History.current h + 1);   (*different notion of proof depth!*)
wenzelm@17076
   174
wenzelm@21958
   175
fun str_of_state (Toplevel _) = "at top level"
wenzelm@21958
   176
  | str_of_state (State (node, _)) =
wenzelm@16815
   177
      (case History.current node of
wenzelm@20963
   178
        Theory (Context.Theory _, _) => "in theory mode"
wenzelm@20963
   179
      | Theory (Context.Proof _, _) => "in local theory mode"
wenzelm@16815
   180
      | Proof _ => "in proof mode"
wenzelm@16815
   181
      | SkipProof _ => "in skipped proof mode");
wenzelm@5946
   182
wenzelm@5946
   183
wenzelm@5828
   184
(* top node *)
wenzelm@5828
   185
wenzelm@21958
   186
fun node_history_of (Toplevel _) = raise UNDEF
wenzelm@21958
   187
  | node_history_of (State (node, _)) = node;
wenzelm@6689
   188
wenzelm@6689
   189
val node_of = History.current o node_history_of;
wenzelm@5828
   190
wenzelm@18589
   191
fun is_theory state = not (is_toplevel state) andalso is_some (theory_node (node_of state));
wenzelm@18589
   192
fun is_proof state = not (is_toplevel state) andalso is_some (proof_node (node_of state));
wenzelm@18589
   193
wenzelm@19063
   194
fun node_case f g state = cases_node f g (node_of state);
wenzelm@5828
   195
wenzelm@21506
   196
val context_of = node_case Context.proof_of Proof.context_of;
wenzelm@22089
   197
val generic_theory_of = node_case I (Context.Proof o Proof.context_of);
wenzelm@20963
   198
val theory_of = node_case Context.theory_of Proof.theory_of;
wenzelm@18589
   199
val proof_of = node_case (fn _ => raise UNDEF) I;
wenzelm@17208
   200
wenzelm@18589
   201
fun proof_position_of state =
wenzelm@18589
   202
  (case node_of state of
wenzelm@18589
   203
    Proof (prf, _) => ProofHistory.position prf
wenzelm@18589
   204
  | _ => raise UNDEF);
wenzelm@6664
   205
wenzelm@21007
   206
val enter_proof_body = node_case (Proof.init o Context.proof_of) Proof.enter_forward;
wenzelm@5828
   207
wenzelm@5828
   208
wenzelm@16815
   209
(* print state *)
wenzelm@16815
   210
wenzelm@25292
   211
val pretty_context = LocalTheory.pretty o Context.cases (TheoryTarget.init NONE) I;
wenzelm@16815
   212
wenzelm@23640
   213
fun print_state_context state =
wenzelm@24795
   214
  (case try node_of state of
wenzelm@21506
   215
    NONE => []
wenzelm@24795
   216
  | SOME (Theory (gthy, _)) => pretty_context gthy
wenzelm@24795
   217
  | SOME (Proof (_, (_, gthy))) => pretty_context gthy
wenzelm@24795
   218
  | SOME (SkipProof (_, (gthy, _))) => pretty_context gthy)
wenzelm@23640
   219
  |> Pretty.chunks |> Pretty.writeln;
wenzelm@16815
   220
wenzelm@23640
   221
fun print_state prf_only state =
wenzelm@23701
   222
  (case try node_of state of
wenzelm@23701
   223
    NONE => []
wenzelm@23701
   224
  | SOME (Theory (gthy, _)) => if prf_only then [] else pretty_context gthy
wenzelm@23701
   225
  | SOME (Proof (prf, _)) =>
wenzelm@23701
   226
      Proof.pretty_state (ProofHistory.position prf) (ProofHistory.current prf)
wenzelm@23701
   227
  | SOME (SkipProof (h, _)) =>
wenzelm@23701
   228
      [Pretty.str ("skipped proof: depth " ^ string_of_int (History.current h))])
wenzelm@23701
   229
  |> Pretty.markup_chunks Markup.state |> Pretty.writeln;
wenzelm@16815
   230
wenzelm@16815
   231
wenzelm@15668
   232
wenzelm@5828
   233
(** toplevel transitions **)
wenzelm@5828
   234
wenzelm@16682
   235
val quiet = ref false;
wenzelm@22135
   236
val debug = Output.debugging;
wenzelm@17321
   237
val interact = ref false;
wenzelm@16682
   238
val timing = Output.timing;
wenzelm@16682
   239
val profiling = ref 0;
wenzelm@16815
   240
val skip_proofs = ref false;
wenzelm@25584
   241
val crashes = ref ([]: exn list);
wenzelm@16682
   242
wenzelm@5828
   243
exception TERMINATE;
wenzelm@5990
   244
exception RESTART;
wenzelm@7022
   245
exception EXCURSION_FAIL of exn * string;
wenzelm@6689
   246
exception FAILURE of state * exn;
wenzelm@24055
   247
exception TOPLEVEL_ERROR;
wenzelm@5828
   248
wenzelm@20128
   249
wenzelm@20128
   250
(* print exceptions *)
wenzelm@20128
   251
wenzelm@20128
   252
local
wenzelm@20128
   253
wenzelm@20128
   254
fun with_context f xs =
wenzelm@22095
   255
  (case ML_Context.get_context () of NONE => []
wenzelm@22089
   256
  | SOME context => map (f (Context.proof_of context)) xs);
wenzelm@20128
   257
wenzelm@20128
   258
fun raised name [] = "exception " ^ name ^ " raised"
wenzelm@20128
   259
  | raised name [msg] = "exception " ^ name ^ " raised: " ^ msg
wenzelm@20128
   260
  | raised name msgs = cat_lines (("exception " ^ name ^ " raised:") :: msgs);
wenzelm@20128
   261
wenzelm@20128
   262
fun exn_msg _ TERMINATE = "Exit."
wenzelm@20128
   263
  | exn_msg _ RESTART = "Restart."
wenzelm@20128
   264
  | exn_msg _ Interrupt = "Interrupt."
wenzelm@24055
   265
  | exn_msg _ TOPLEVEL_ERROR = "Error."
wenzelm@20128
   266
  | exn_msg _ (SYS_ERROR msg) = "## SYSTEM ERROR ##\n" ^ msg
wenzelm@20128
   267
  | exn_msg _ (ERROR msg) = msg
wenzelm@23975
   268
  | exn_msg detailed (Exn.EXCEPTIONS (exns, "")) = cat_lines (map (exn_msg detailed) exns)
wenzelm@23963
   269
  | exn_msg detailed (Exn.EXCEPTIONS (exns, msg)) = cat_lines (map (exn_msg detailed) exns @ [msg])
wenzelm@20128
   270
  | exn_msg detailed (EXCURSION_FAIL (exn, msg)) = cat_lines [exn_msg detailed exn, msg]
wenzelm@20128
   271
  | exn_msg false (THEORY (msg, _)) = msg
wenzelm@20128
   272
  | exn_msg true (THEORY (msg, thys)) = raised "THEORY" (msg :: map Context.str_of_thy thys)
wenzelm@20128
   273
  | exn_msg false (Syntax.AST (msg, _)) = raised "AST" [msg]
wenzelm@20128
   274
  | exn_msg true (Syntax.AST (msg, asts)) =
wenzelm@20128
   275
      raised "AST" (msg :: map (Pretty.string_of o Syntax.pretty_ast) asts)
wenzelm@20128
   276
  | exn_msg false (TYPE (msg, _, _)) = raised "TYPE" [msg]
wenzelm@20128
   277
  | exn_msg true (TYPE (msg, Ts, ts)) = raised "TYPE" (msg ::
wenzelm@24920
   278
        with_context Syntax.string_of_typ Ts @ with_context Syntax.string_of_term ts)
wenzelm@20128
   279
  | exn_msg false (TERM (msg, _)) = raised "TERM" [msg]
wenzelm@22089
   280
  | exn_msg true (TERM (msg, ts)) =
wenzelm@24920
   281
      raised "TERM" (msg :: with_context Syntax.string_of_term ts)
wenzelm@20128
   282
  | exn_msg false (THM (msg, _, _)) = raised "THM" [msg]
wenzelm@20128
   283
  | exn_msg true (THM (msg, i, thms)) =
wenzelm@22089
   284
      raised ("THM " ^ string_of_int i) (msg :: with_context ProofContext.string_of_thm thms)
wenzelm@20128
   285
  | exn_msg _ Option.Option = raised "Option" []
wenzelm@20128
   286
  | exn_msg _ Library.UnequalLengths = raised "UnequalLengths" []
wenzelm@20128
   287
  | exn_msg _ Empty = raised "Empty" []
wenzelm@20128
   288
  | exn_msg _ Subscript = raised "Subscript" []
wenzelm@20128
   289
  | exn_msg _ (Fail msg) = raised "Fail" [msg]
wenzelm@23940
   290
  | exn_msg _ exn = General.exnMessage exn;
wenzelm@20128
   291
wenzelm@20128
   292
in
wenzelm@20128
   293
wenzelm@20128
   294
fun exn_message exn = exn_msg (! debug) exn;
wenzelm@25809
   295
fun print_exn (exn, s) = Output.error_msg (cat_lines [exn_message exn, s]);
wenzelm@20128
   296
wenzelm@20128
   297
end;
wenzelm@20128
   298
wenzelm@20128
   299
wenzelm@20128
   300
(* controlled execution *)
wenzelm@20128
   301
wenzelm@20128
   302
local
wenzelm@20128
   303
wenzelm@18685
   304
fun debugging f x =
wenzelm@23940
   305
  if ! debug then exception_trace (fn () => f x)
wenzelm@18685
   306
  else f x;
wenzelm@18685
   307
wenzelm@20128
   308
fun interruptible f x =
wenzelm@25219
   309
  let val y = ref NONE
wenzelm@25219
   310
  in raise_interrupt (fn () => y := SOME (f x)) (); the (! y) end;
wenzelm@20128
   311
wenzelm@24055
   312
fun toplevel_error f x = f x
wenzelm@24055
   313
  handle exn => (Output.error_msg (exn_message exn); raise TOPLEVEL_ERROR);
wenzelm@24055
   314
wenzelm@20128
   315
in
wenzelm@20128
   316
wenzelm@20128
   317
fun controlled_execution f =
wenzelm@20128
   318
  f
wenzelm@20128
   319
  |> debugging
wenzelm@24055
   320
  |> interruptible;
wenzelm@20128
   321
wenzelm@20128
   322
fun program f =
wenzelm@24055
   323
 (f
wenzelm@24055
   324
  |> debugging
wenzelm@24055
   325
  |> toplevel_error) ();
wenzelm@20128
   326
wenzelm@20128
   327
end;
wenzelm@20128
   328
wenzelm@5828
   329
wenzelm@16815
   330
(* node transactions and recovery from stale theories *)
wenzelm@6689
   331
wenzelm@16815
   332
(*NB: proof commands should be non-destructive!*)
wenzelm@7022
   333
wenzelm@6689
   334
local
wenzelm@6689
   335
wenzelm@16452
   336
fun is_stale state = Context.is_stale (theory_of state) handle UNDEF => false;
wenzelm@6689
   337
wenzelm@18685
   338
val stale_theory = ERROR "Stale theory encountered after succesful execution!";
wenzelm@16815
   339
wenzelm@23363
   340
fun map_theory f = History.map_current
wenzelm@21177
   341
  (fn Theory (gthy, _) => Theory (Context.mapping f (LocalTheory.raw_theory f) gthy, NONE)
wenzelm@21177
   342
    | node => node);
wenzelm@6689
   343
skalberg@15531
   344
fun return (result, NONE) = result
skalberg@15531
   345
  | return (result, SOME exn) = raise FAILURE (result, exn);
wenzelm@7022
   346
wenzelm@6689
   347
in
wenzelm@6689
   348
wenzelm@23363
   349
fun transaction hist pos f (node, term) =
wenzelm@20128
   350
  let
wenzelm@21177
   351
    val cont_node = map_theory Theory.checkpoint node;
wenzelm@21177
   352
    val back_node = map_theory Theory.copy cont_node;
wenzelm@21958
   353
    fun state nd = State (nd, term);
wenzelm@20128
   354
    fun normal_state nd = (state nd, NONE);
wenzelm@20128
   355
    fun error_state nd exn = (state nd, SOME exn);
wenzelm@6689
   356
wenzelm@20128
   357
    val (result, err) =
wenzelm@20128
   358
      cont_node
wenzelm@20128
   359
      |> (f
wenzelm@23363
   360
          |> (if hist then History.apply' (History.current back_node) else History.map_current)
wenzelm@20128
   361
          |> controlled_execution)
wenzelm@20128
   362
      |> normal_state
wenzelm@20128
   363
      handle exn => error_state cont_node exn;
wenzelm@20128
   364
  in
wenzelm@20128
   365
    if is_stale result
wenzelm@20128
   366
    then return (error_state back_node (the_default stale_theory err))
wenzelm@20128
   367
    else return (result, err)
wenzelm@20128
   368
  end;
wenzelm@6689
   369
wenzelm@6689
   370
end;
wenzelm@6689
   371
wenzelm@6689
   372
wenzelm@6689
   373
(* primitive transitions *)
wenzelm@6689
   374
wenzelm@18563
   375
(*Note: Recovery from stale theories is provided only for theory-level
wenzelm@18589
   376
  operations via Transaction.  Other node or state operations should
wenzelm@18589
   377
  not touch theories at all.  Interrupts are enabled only for Keep and
wenzelm@18589
   378
  Transaction.*)
wenzelm@5828
   379
wenzelm@5828
   380
datatype trans =
wenzelm@22056
   381
  Init of (bool -> theory) * ((theory -> unit) * (theory -> unit)) |
wenzelm@21958
   382
                                                    (*init node; with exit/kill operation*)
wenzelm@25441
   383
  InitEmpty of (state -> bool) * (unit -> unit) |   (*init empty toplevel*)
wenzelm@21958
   384
  Exit |                                            (*conclude node -- deferred until init*)
wenzelm@21958
   385
  UndoExit |                                        (*continue after conclusion*)
wenzelm@21958
   386
  Kill |                                            (*abort node*)
wenzelm@21958
   387
  History of node History.T -> node History.T |     (*history operation (undo etc.)*)
wenzelm@21958
   388
  Keep of bool -> state -> unit |                   (*peek at state*)
wenzelm@21958
   389
  Transaction of bool * (bool -> node -> node);     (*node transaction*)
wenzelm@6689
   390
skalberg@15531
   391
fun undo_limit int = if int then NONE else SOME 0;
wenzelm@6689
   392
wenzelm@22056
   393
fun safe_exit (Toplevel (SOME (node, (exit, _)))) =
wenzelm@22056
   394
    (case try the_global_theory (History.current node) of
wenzelm@25219
   395
      SOME thy => controlled_execution exit thy
wenzelm@22056
   396
    | NONE => ())
wenzelm@22056
   397
  | safe_exit _ = ();
wenzelm@21958
   398
wenzelm@6689
   399
local
wenzelm@5828
   400
wenzelm@21958
   401
fun keep_state int f = controlled_execution (fn x => tap (f int) x);
wenzelm@21958
   402
wenzelm@23363
   403
fun apply_tr int _ (Init (f, term)) (state as Toplevel _) =
wenzelm@22056
   404
      let val node = Theory (Context.Theory (f int), NONE)
wenzelm@22056
   405
      in safe_exit state; State (History.init (undo_limit int) node, term) end
wenzelm@25441
   406
  | apply_tr int _ (InitEmpty (check, f)) (state as Toplevel _) =
wenzelm@25441
   407
      if check state then (safe_exit state; keep_state int (fn _ => fn _ => f ()) toplevel)
wenzelm@25441
   408
      else raise UNDEF
wenzelm@23363
   409
  | apply_tr _ _ Exit (State (node, term)) =
wenzelm@22056
   410
      (the_global_theory (History.current node); Toplevel (SOME (node, term)))
wenzelm@23363
   411
  | apply_tr _ _ UndoExit (Toplevel (SOME state_info)) = State state_info
wenzelm@23363
   412
  | apply_tr _ _ Kill (State (node, (_, kill))) =
wenzelm@22056
   413
      (kill (the_global_theory (History.current node)); toplevel)
wenzelm@23363
   414
  | apply_tr _ _ (History f) (State (node, term)) = State (f node, term)
wenzelm@23363
   415
  | apply_tr int _ (Keep f) state = keep_state int f state
wenzelm@23363
   416
  | apply_tr int pos (Transaction (hist, f)) (State state) =
wenzelm@23363
   417
      transaction hist pos (fn x => f int x) state
wenzelm@23363
   418
  | apply_tr _ _ _ _ = raise UNDEF;
wenzelm@5828
   419
wenzelm@23363
   420
fun apply_union _ _ [] state = raise FAILURE (state, UNDEF)
wenzelm@23363
   421
  | apply_union int pos (tr :: trs) state =
wenzelm@23363
   422
      apply_tr int pos tr state
wenzelm@23363
   423
        handle UNDEF => apply_union int pos trs state
wenzelm@23363
   424
          | FAILURE (alt_state, UNDEF) => apply_union int pos trs alt_state
wenzelm@6689
   425
          | exn as FAILURE _ => raise exn
wenzelm@6689
   426
          | exn => raise FAILURE (state, exn);
wenzelm@6689
   427
wenzelm@6689
   428
in
wenzelm@6689
   429
wenzelm@23363
   430
fun apply_trans int pos trs state = (apply_union int pos trs state, NONE)
skalberg@15531
   431
  handle FAILURE (alt_state, exn) => (alt_state, SOME exn) | exn => (state, SOME exn);
wenzelm@6689
   432
wenzelm@6689
   433
end;
wenzelm@5828
   434
wenzelm@5828
   435
wenzelm@5828
   436
(* datatype transition *)
wenzelm@5828
   437
wenzelm@5828
   438
datatype transition = Transition of
wenzelm@16815
   439
 {name: string,                        (*command name*)
wenzelm@16815
   440
  pos: Position.T,                     (*source position*)
wenzelm@16815
   441
  source: OuterLex.token list option,  (*source text*)
wenzelm@16815
   442
  int_only: bool,                      (*interactive-only*)
wenzelm@16815
   443
  print: string list,                  (*print modes (union)*)
wenzelm@16815
   444
  no_timing: bool,                     (*suppress timing*)
wenzelm@16815
   445
  trans: trans list};                  (*primitive transitions (union)*)
wenzelm@5828
   446
wenzelm@25960
   447
fun make_transition (name, pos, source, int_only, print, no_timing, trans) =
wenzelm@25960
   448
  Transition {name = name, pos = pos, source = source,
wenzelm@14923
   449
    int_only = int_only, print = print, no_timing = no_timing, trans = trans};
wenzelm@5828
   450
wenzelm@25960
   451
fun map_transition f (Transition {name, pos, source, int_only, print, no_timing, trans}) =
wenzelm@25960
   452
  make_transition (f (name, pos, source, int_only, print, no_timing, trans));
wenzelm@5828
   453
wenzelm@25960
   454
val empty = make_transition ("<unknown>", Position.none, NONE, false, [], false, []);
wenzelm@14923
   455
wenzelm@14923
   456
fun name_of (Transition {name, ...}) = name;
wenzelm@14923
   457
fun source_of (Transition {source, ...}) = source;
wenzelm@5828
   458
wenzelm@5828
   459
wenzelm@5828
   460
(* diagnostics *)
wenzelm@5828
   461
wenzelm@5828
   462
fun str_of_transition (Transition {name, pos, ...}) = quote name ^ Position.str_of pos;
wenzelm@5828
   463
wenzelm@5828
   464
fun command_msg msg tr = msg ^ "command " ^ str_of_transition tr;
wenzelm@5828
   465
fun at_command tr = command_msg "At " tr ^ ".";
wenzelm@5828
   466
wenzelm@5828
   467
fun type_error tr state =
wenzelm@18685
   468
  ERROR (command_msg "Illegal application of " tr ^ " " ^ str_of_state state);
wenzelm@5828
   469
wenzelm@5828
   470
wenzelm@5828
   471
(* modify transitions *)
wenzelm@5828
   472
wenzelm@25960
   473
fun name nm = map_transition (fn (_, pos, source, int_only, print, no_timing, trans) =>
wenzelm@25960
   474
  (nm, pos, source, int_only, print, no_timing, trans));
wenzelm@5828
   475
wenzelm@25960
   476
fun position pos = map_transition (fn (name, _, source, int_only, print, no_timing, trans) =>
wenzelm@25960
   477
  (name, pos, source, int_only, print, no_timing, trans));
wenzelm@9010
   478
wenzelm@25960
   479
fun source src = map_transition (fn (name, pos, _, int_only, print, no_timing, trans) =>
wenzelm@25960
   480
  (name, pos, SOME src, int_only, print, no_timing, trans));
wenzelm@5828
   481
wenzelm@25960
   482
fun interactive int_only = map_transition (fn (name, pos, source, _, print, no_timing, trans) =>
wenzelm@25960
   483
  (name, pos, source, int_only, print, no_timing, trans));
wenzelm@14923
   484
wenzelm@25960
   485
val no_timing = map_transition (fn (name, pos, source, int_only, print, _, trans) =>
wenzelm@25960
   486
  (name, pos, source, int_only, print, true, trans));
wenzelm@17363
   487
wenzelm@25960
   488
fun add_trans tr = map_transition (fn (name, pos, source, int_only, print, no_timing, trans) =>
wenzelm@25960
   489
  (name, pos, source, int_only, print, no_timing, trans @ [tr]));
wenzelm@17363
   490
wenzelm@25960
   491
fun print' mode = map_transition (fn (name, pos, source, int_only, print, no_timing, trans) =>
wenzelm@25960
   492
  (name, pos, source, int_only, insert (op =) mode print, no_timing, trans));
wenzelm@16607
   493
wenzelm@16607
   494
val print = print' "";
wenzelm@5828
   495
wenzelm@17363
   496
val three_buffersN = "three_buffers";
wenzelm@17363
   497
val print3 = print' three_buffersN;
wenzelm@5828
   498
wenzelm@5828
   499
wenzelm@21007
   500
(* basic transitions *)
wenzelm@5828
   501
wenzelm@22056
   502
fun init_theory f exit kill = add_trans (Init (f, (exit, kill)));
wenzelm@25441
   503
fun init_empty check f = add_trans (InitEmpty (check, f));
wenzelm@6689
   504
val exit = add_trans Exit;
wenzelm@21958
   505
val undo_exit = add_trans UndoExit;
wenzelm@6689
   506
val kill = add_trans Kill;
wenzelm@20128
   507
val history = add_trans o History;
wenzelm@7612
   508
val keep' = add_trans o Keep;
wenzelm@18592
   509
fun map_current f = add_trans (Transaction (false, f));
wenzelm@18592
   510
fun app_current f = add_trans (Transaction (true, f));
wenzelm@5828
   511
wenzelm@7612
   512
fun keep f = add_trans (Keep (fn _ => f));
wenzelm@5828
   513
fun imperative f = keep (fn _ => f ());
wenzelm@5828
   514
wenzelm@21007
   515
val unknown_theory = imperative (fn () => warning "Unknown theory context");
wenzelm@21007
   516
val unknown_proof = imperative (fn () => warning "Unknown proof context");
wenzelm@21007
   517
val unknown_context = imperative (fn () => warning "Unknown context");
wenzelm@15668
   518
wenzelm@21007
   519
wenzelm@21007
   520
(* theory transitions *)
wenzelm@15668
   521
wenzelm@20963
   522
fun theory' f = app_current (fn int =>
wenzelm@20963
   523
  (fn Theory (Context.Theory thy, _) => Theory (Context.Theory (f int thy), NONE)
wenzelm@20963
   524
    | _ => raise UNDEF));
wenzelm@20963
   525
wenzelm@20963
   526
fun theory f = theory' (K f);
wenzelm@20963
   527
wenzelm@21294
   528
fun begin_local_theory begin f = app_current (fn _ =>
wenzelm@20963
   529
  (fn Theory (Context.Theory thy, _) =>
wenzelm@20963
   530
        let
wenzelm@20985
   531
          val lthy = f thy;
wenzelm@21294
   532
          val gthy = if begin then Context.Proof lthy else Context.Theory (loc_exit lthy);
wenzelm@21294
   533
        in Theory (gthy, SOME lthy) end
wenzelm@20963
   534
    | _ => raise UNDEF));
wenzelm@17076
   535
wenzelm@21294
   536
val end_local_theory = app_current (fn _ =>
wenzelm@21294
   537
  (fn Theory (Context.Proof lthy, _) => Theory (Context.Theory (loc_exit lthy), SOME lthy)
wenzelm@21007
   538
    | _ => raise UNDEF));
wenzelm@21007
   539
wenzelm@21007
   540
local
wenzelm@21007
   541
wenzelm@20963
   542
fun local_theory_presentation loc f g = app_current (fn int =>
wenzelm@21294
   543
  (fn Theory (gthy, _) =>
wenzelm@21294
   544
        let
wenzelm@21294
   545
          val finish = loc_finish loc gthy;
wenzelm@25960
   546
          val lthy' = f (loc_begin loc gthy);
wenzelm@21294
   547
        in Theory (finish lthy', SOME lthy') end
wenzelm@20963
   548
    | _ => raise UNDEF) #> tap (g int));
wenzelm@15668
   549
wenzelm@21007
   550
in
wenzelm@21007
   551
wenzelm@20963
   552
fun local_theory loc f = local_theory_presentation loc f (K I);
wenzelm@20963
   553
fun present_local_theory loc g = local_theory_presentation loc I g;
wenzelm@18955
   554
wenzelm@21007
   555
end;
wenzelm@21007
   556
wenzelm@21007
   557
wenzelm@21007
   558
(* proof transitions *)
wenzelm@21007
   559
wenzelm@21007
   560
fun end_proof f = map_current (fn int =>
wenzelm@24795
   561
  (fn Proof (prf, (finish, _)) =>
wenzelm@21007
   562
        let val state = ProofHistory.current prf in
wenzelm@21007
   563
          if can (Proof.assert_bottom true) state then
wenzelm@21007
   564
            let
wenzelm@21007
   565
              val ctxt' = f int state;
wenzelm@21007
   566
              val gthy' = finish ctxt';
wenzelm@21007
   567
            in Theory (gthy', SOME ctxt') end
wenzelm@21007
   568
          else raise UNDEF
wenzelm@21007
   569
        end
wenzelm@21007
   570
    | SkipProof (h, (gthy, _)) =>
wenzelm@21007
   571
        if History.current h = 0 then Theory (gthy, NONE) else raise UNDEF
wenzelm@21007
   572
    | _ => raise UNDEF));
wenzelm@21007
   573
wenzelm@21294
   574
local
wenzelm@21294
   575
wenzelm@21294
   576
fun begin_proof init finish = app_current (fn int =>
wenzelm@21294
   577
  (fn Theory (gthy, _) =>
wenzelm@21294
   578
    let
berghofe@24453
   579
      val prf = init int gthy;
wenzelm@21294
   580
      val schematic = Proof.schematic_goal prf;
wenzelm@21294
   581
    in
wenzelm@21294
   582
      if ! skip_proofs andalso schematic then
wenzelm@21294
   583
        warning "Cannot skip proof of schematic goal statement"
wenzelm@21294
   584
      else ();
wenzelm@21294
   585
      if ! skip_proofs andalso not schematic then
wenzelm@21294
   586
        SkipProof
wenzelm@21294
   587
          (History.init (undo_limit int) 0, (finish gthy (Proof.global_skip_proof int prf), gthy))
wenzelm@21294
   588
      else Proof (ProofHistory.init (undo_limit int) prf, (finish gthy, gthy))
wenzelm@21294
   589
    end
wenzelm@21294
   590
  | _ => raise UNDEF));
wenzelm@21294
   591
wenzelm@21294
   592
in
wenzelm@21294
   593
wenzelm@24780
   594
fun local_theory_to_proof' loc f = begin_proof
wenzelm@25960
   595
  (fn int => fn gthy => f int (loc_begin loc gthy))
wenzelm@24780
   596
  (loc_finish loc);
wenzelm@24780
   597
berghofe@24453
   598
fun local_theory_to_proof loc f = local_theory_to_proof' loc (K f);
wenzelm@21294
   599
wenzelm@21294
   600
fun theory_to_proof f = begin_proof
wenzelm@24780
   601
  (K (fn Context.Theory thy => f thy | _ => raise UNDEF))
wenzelm@24780
   602
  (K (Context.Theory o ProofContext.theory_of));
wenzelm@21294
   603
wenzelm@21294
   604
end;
wenzelm@21294
   605
wenzelm@21007
   606
val forget_proof = map_current (fn _ =>
wenzelm@21007
   607
  (fn Proof (_, (_, orig_gthy)) => Theory (orig_gthy, NONE)
wenzelm@21007
   608
    | SkipProof (_, (_, orig_gthy)) => Theory (orig_gthy, NONE)
wenzelm@21007
   609
    | _ => raise UNDEF));
wenzelm@21007
   610
wenzelm@21177
   611
fun present_proof f = map_current (fn int =>
wenzelm@21177
   612
  (fn Proof (prf, x) => Proof (ProofHistory.apply I prf, x)
wenzelm@21177
   613
    | SkipProof (h, x) => SkipProof (History.apply I h, x)
wenzelm@21177
   614
    | _ => raise UNDEF) #> tap (f int));
wenzelm@21177
   615
wenzelm@17904
   616
fun proofs' f = map_current (fn int =>
wenzelm@21007
   617
  (fn Proof (prf, x) => Proof (ProofHistory.applys (f int) prf, x)
wenzelm@21007
   618
    | SkipProof (h, x) => SkipProof (History.apply I h, x)
wenzelm@16815
   619
    | _ => raise UNDEF));
wenzelm@15668
   620
wenzelm@17904
   621
fun proof' f = proofs' (Seq.single oo f);
wenzelm@17904
   622
val proofs = proofs' o K;
wenzelm@6689
   623
val proof = proof' o K;
wenzelm@16815
   624
wenzelm@16815
   625
fun actual_proof f = map_current (fn _ =>
wenzelm@21007
   626
  (fn Proof (prf, x) => Proof (f prf, x)
wenzelm@20963
   627
    | _ => raise UNDEF));
wenzelm@16815
   628
wenzelm@16815
   629
fun skip_proof f = map_current (fn _ =>
wenzelm@21007
   630
  (fn SkipProof (h, x) => SkipProof (f h, x)
wenzelm@18563
   631
    | _ => raise UNDEF));
wenzelm@18563
   632
wenzelm@16815
   633
fun skip_proof_to_theory p = map_current (fn _ =>
wenzelm@21007
   634
  (fn SkipProof (h, (gthy, _)) =>
wenzelm@21007
   635
    if p (History.current h) then Theory (gthy, NONE)
wenzelm@17904
   636
    else raise UNDEF
wenzelm@17904
   637
  | _ => raise UNDEF));
wenzelm@5828
   638
wenzelm@5828
   639
wenzelm@5828
   640
wenzelm@5828
   641
(** toplevel transactions **)
wenzelm@5828
   642
wenzelm@25960
   643
(* thread position *)
wenzelm@25799
   644
wenzelm@25960
   645
fun setmp_thread_position (Transition {pos, ...}) f x =
wenzelm@25819
   646
  Position.setmp_thread_data pos f x;
wenzelm@25799
   647
wenzelm@25799
   648
wenzelm@5828
   649
(* apply transitions *)
wenzelm@5828
   650
wenzelm@6664
   651
local
wenzelm@6664
   652
wenzelm@25799
   653
fun app int (tr as Transition {trans, pos, int_only, print, no_timing, ...}) =
wenzelm@25819
   654
  setmp_thread_position tr (fn state =>
wenzelm@25799
   655
    let
wenzelm@25799
   656
      val _ =
wenzelm@25799
   657
        if not int andalso int_only then warning (command_msg "Interactive-only " tr)
wenzelm@25799
   658
        else ();
wenzelm@16682
   659
wenzelm@25799
   660
      fun do_timing f x = (warning (command_msg "" tr); timeap f x);
wenzelm@25799
   661
      fun do_profiling f x = profile (! profiling) f x;
wenzelm@25799
   662
wenzelm@25799
   663
      val (result, opt_exn) =
wenzelm@25799
   664
         state |> (apply_trans int pos trans
wenzelm@25799
   665
          |> (if ! profiling > 0 andalso not no_timing then do_profiling else I)
wenzelm@25799
   666
          |> (if ! profiling > 0 orelse ! timing andalso not no_timing then do_timing else I));
wenzelm@25799
   667
      val _ =
wenzelm@25799
   668
        if int andalso not (! quiet) andalso exists (member (op =) print) ("" :: print_mode_value ())
wenzelm@25799
   669
        then print_state false result else ();
wenzelm@25799
   670
    in (result, Option.map (fn UNDEF => type_error tr state | exn => exn) opt_exn) end);
wenzelm@6664
   671
wenzelm@6664
   672
in
wenzelm@5828
   673
wenzelm@6689
   674
fun apply int tr st =
wenzelm@6965
   675
  (case app int tr st of
skalberg@15531
   676
    (_, SOME TERMINATE) => NONE
skalberg@15531
   677
  | (_, SOME RESTART) => SOME (toplevel, NONE)
skalberg@15531
   678
  | (state', SOME (EXCURSION_FAIL exn_info)) => SOME (state', SOME exn_info)
skalberg@15531
   679
  | (state', SOME exn) => SOME (state', SOME (exn, at_command tr))
skalberg@15531
   680
  | (state', NONE) => SOME (state', NONE));
wenzelm@6664
   681
wenzelm@6664
   682
end;
wenzelm@5828
   683
wenzelm@5828
   684
wenzelm@17076
   685
(* excursion: toplevel -- apply transformers/presentation -- toplevel *)
wenzelm@5828
   686
wenzelm@6664
   687
local
wenzelm@6664
   688
wenzelm@5828
   689
fun excur [] x = x
wenzelm@17076
   690
  | excur ((tr, pr) :: trs) (st, res) =
wenzelm@17321
   691
      (case apply (! interact) tr st of
skalberg@15531
   692
        SOME (st', NONE) =>
wenzelm@18685
   693
          excur trs (st', pr st st' res handle exn =>
wenzelm@10324
   694
            raise EXCURSION_FAIL (exn, "Presentation failed\n" ^ at_command tr))
skalberg@15531
   695
      | SOME (st', SOME exn_info) => raise EXCURSION_FAIL exn_info
skalberg@15531
   696
      | NONE => raise EXCURSION_FAIL (TERMINATE, at_command tr));
wenzelm@5828
   697
wenzelm@17076
   698
fun no_pr _ _ _ = ();
wenzelm@17076
   699
wenzelm@6664
   700
in
wenzelm@6664
   701
wenzelm@17076
   702
fun present_excursion trs res =
wenzelm@21958
   703
  (case excur trs (toplevel, res) of
wenzelm@22056
   704
    (state as Toplevel _, res') => (safe_exit state; res')
wenzelm@18685
   705
  | _ => error "Unfinished development at end of input")
wenzelm@9134
   706
  handle exn => error (exn_message exn);
wenzelm@9134
   707
wenzelm@17076
   708
fun excursion trs = present_excursion (map (rpair no_pr) trs) ();
wenzelm@7062
   709
wenzelm@6664
   710
end;
wenzelm@6664
   711
wenzelm@5828
   712
wenzelm@5828
   713
wenzelm@5828
   714
(** interactive transformations **)
wenzelm@5828
   715
wenzelm@5828
   716
(* the global state reference *)
wenzelm@5828
   717
skalberg@15531
   718
val global_state = ref (toplevel, NONE: (exn * string) option);
wenzelm@5828
   719
skalberg@15531
   720
fun set_state state = global_state := (state, NONE);
wenzelm@5828
   721
fun get_state () = fst (! global_state);
wenzelm@5828
   722
fun exn () = snd (! global_state);
wenzelm@5828
   723
wenzelm@5828
   724
wenzelm@24295
   725
(* apply transformers to global state --- NOT THREAD-SAFE! *)
wenzelm@5828
   726
wenzelm@14985
   727
nonfix >> >>>;
wenzelm@5828
   728
wenzelm@24295
   729
fun >> tr =
wenzelm@5828
   730
  (case apply true tr (get_state ()) of
skalberg@15531
   731
    NONE => false
skalberg@15531
   732
  | SOME (state', exn_info) =>
wenzelm@5828
   733
      (global_state := (state', exn_info);
wenzelm@25809
   734
        (case exn_info of
wenzelm@25809
   735
          NONE => ()
wenzelm@25819
   736
        | SOME err => setmp_thread_position tr print_exn err);
wenzelm@24295
   737
        true));
wenzelm@5828
   738
wenzelm@14985
   739
fun >>> [] = ()
wenzelm@14985
   740
  | >>> (tr :: trs) = if >> tr then >>> trs else ();
wenzelm@14985
   741
wenzelm@25441
   742
fun init_state () = (>> (init_empty (K true) (K ()) empty); ());
wenzelm@21958
   743
wenzelm@21958
   744
wenzelm@21958
   745
(* the Isar source of transitions *)
wenzelm@21958
   746
wenzelm@21958
   747
type 'a isar =
wenzelm@21958
   748
  (transition, (transition option,
wenzelm@21958
   749
    (OuterLex.token, (OuterLex.token option, (OuterLex.token, (OuterLex.token,
wenzelm@21958
   750
      Position.T * (Symbol.symbol, (string, 'a) Source.source) Source.source)
wenzelm@21958
   751
          Source.source) Source.source) Source.source) Source.source) Source.source) Source.source;
wenzelm@21958
   752
wenzelm@25527
   753
local
wenzelm@25527
   754
wenzelm@17513
   755
(*Spurious interrupts ahead!  Race condition?*)
wenzelm@17513
   756
fun get_interrupt src = SOME (Source.get_single src) handle Interrupt => NONE;
wenzelm@7602
   757
wenzelm@25527
   758
fun raw_loop secure src =
wenzelm@25527
   759
  let
wenzelm@25527
   760
    fun check_secure () =
wenzelm@25527
   761
      (if secure then warning "Secure loop -- cannot exit to ML" else (); secure);
wenzelm@25527
   762
  in
wenzelm@25847
   763
    (case get_interrupt (Source.set_prompt Source.default_prompt src) of
wenzelm@25527
   764
      NONE => (writeln "\nInterrupt."; raw_loop secure src)
wenzelm@25527
   765
    | SOME NONE => if secure then quit () else ()
wenzelm@25527
   766
    | SOME (SOME (tr, src')) => if >> tr orelse check_secure () then raw_loop secure src' else ())
wenzelm@25584
   767
    handle exn => (CRITICAL (fn () => change crashes (cons exn));
wenzelm@25584
   768
      warning "Recovering after Isar toplevel crash -- see also Toplevel.crashes";
wenzelm@25584
   769
      raw_loop secure src)
wenzelm@23640
   770
  end;
wenzelm@5828
   771
wenzelm@25527
   772
in
wenzelm@25527
   773
wenzelm@25527
   774
fun loop secure src = ignore_interrupt (raw_loop secure) src;
wenzelm@5828
   775
wenzelm@5828
   776
end;
wenzelm@25527
   777
wenzelm@25527
   778
end;