src/Pure/System/isar.ML
author wenzelm
Wed Oct 28 22:01:40 2009 +0100 (2009-10-28 ago)
changeset 33289 d0c2ef490613
parent 33223 d27956b4d3b4
child 36950 75b8f26f2f07
permissions -rw-r--r--
Isar.goal: Proof.simple_goal, not raw version;
wenzelm@30175
     1
(*  Title:      Pure/System/isar.ML
wenzelm@26605
     2
    Author:     Makarius
wenzelm@26605
     3
wenzelm@26605
     4
The global Isabelle/Isar state and main read-eval-print loop.
wenzelm@26605
     5
*)
wenzelm@26605
     6
wenzelm@26605
     7
signature ISAR =
wenzelm@26605
     8
sig
wenzelm@29348
     9
  val init: unit -> unit
wenzelm@29348
    10
  val exn: unit -> (exn * string) option
wenzelm@26605
    11
  val state: unit -> Toplevel.state
wenzelm@26605
    12
  val context: unit -> Proof.context
wenzelm@33289
    13
  val goal: unit -> {context: Proof.context, facts: thm list, goal: thm}
wenzelm@27533
    14
  val print: unit -> unit
wenzelm@26605
    15
  val >> : Toplevel.transition -> bool
wenzelm@26605
    16
  val >>> : Toplevel.transition list -> unit
wenzelm@27529
    17
  val linear_undo: int -> unit
wenzelm@27524
    18
  val undo: int -> unit
wenzelm@27530
    19
  val kill: unit -> unit
wenzelm@27530
    20
  val kill_proof: unit -> unit
wenzelm@32738
    21
  val crashes: exn list Unsynchronized.ref
wenzelm@26643
    22
  val toplevel_loop: {init: bool, welcome: bool, sync: bool, secure: bool} -> unit
wenzelm@26605
    23
  val loop: unit -> unit
wenzelm@26606
    24
  val main: unit -> unit
wenzelm@26605
    25
end;
wenzelm@26605
    26
wenzelm@26605
    27
structure Isar: ISAR =
wenzelm@26605
    28
struct
wenzelm@26605
    29
wenzelm@27432
    30
wenzelm@29348
    31
(** TTY model -- SINGLE-THREADED! **)
wenzelm@29348
    32
wenzelm@29348
    33
(* the global state *)
wenzelm@29348
    34
wenzelm@29348
    35
type history = (Toplevel.state * Toplevel.transition) list;
wenzelm@29348
    36
  (*previous state, state transition -- regular commands only*)
wenzelm@29348
    37
wenzelm@29348
    38
local
wenzelm@32738
    39
  val global_history = Unsynchronized.ref ([]: history);
wenzelm@32738
    40
  val global_state = Unsynchronized.ref Toplevel.toplevel;
wenzelm@32738
    41
  val global_exn = Unsynchronized.ref (NONE: (exn * string) option);
wenzelm@29348
    42
in
wenzelm@29348
    43
wenzelm@29348
    44
fun edit_history count f = NAMED_CRITICAL "Isar" (fn () =>
wenzelm@29348
    45
  let
wenzelm@29348
    46
    fun edit 0 (st, hist) = (global_history := hist; global_state := st; global_exn := NONE)
wenzelm@29348
    47
      | edit n (st, hist) = edit (n - 1) (f st hist);
wenzelm@29348
    48
  in edit count (! global_state, ! global_history) end);
wenzelm@29348
    49
wenzelm@33223
    50
fun state () = ! global_state;
wenzelm@29348
    51
wenzelm@33223
    52
fun exn () = ! global_exn;
wenzelm@33223
    53
fun set_exn exn =  global_exn := exn;
wenzelm@29348
    54
wenzelm@29348
    55
end;
wenzelm@29348
    56
wenzelm@29348
    57
wenzelm@29348
    58
fun init () = edit_history 1 (K (K (Toplevel.toplevel, [])));
wenzelm@29348
    59
wenzelm@29348
    60
fun context () = Toplevel.context_of (state ())
wenzelm@29348
    61
  handle Toplevel.UNDEF => error "Unknown context";
wenzelm@29348
    62
wenzelm@33289
    63
fun goal () = Proof.goal (Toplevel.proof_of (state ()))
wenzelm@29348
    64
  handle Toplevel.UNDEF => error "No goal present";
wenzelm@29348
    65
wenzelm@29348
    66
fun print () = Toplevel.print_state false (state ());
wenzelm@29348
    67
wenzelm@29348
    68
wenzelm@29348
    69
(* history navigation *)
wenzelm@29348
    70
wenzelm@29348
    71
local
wenzelm@29348
    72
wenzelm@29348
    73
fun find_and_undo _ [] = error "Undo history exhausted"
wenzelm@29348
    74
  | find_and_undo which ((prev, tr) :: hist) =
wenzelm@29348
    75
      ((case Toplevel.init_of tr of SOME name => ThyInfo.kill_thy name | NONE => ());
wenzelm@29348
    76
        if which (Toplevel.name_of tr) then (prev, hist) else find_and_undo which hist);
wenzelm@29348
    77
wenzelm@29348
    78
in
wenzelm@29348
    79
wenzelm@29348
    80
fun linear_undo n = edit_history n (K (find_and_undo (K true)));
wenzelm@29348
    81
wenzelm@29348
    82
fun undo n = edit_history n (fn st => fn hist =>
wenzelm@29348
    83
  find_and_undo (if Toplevel.is_proof st then K true else OuterKeyword.is_theory) hist);
wenzelm@29348
    84
wenzelm@29348
    85
fun kill () = edit_history 1 (fn st => fn hist =>
wenzelm@29348
    86
  find_and_undo
wenzelm@29348
    87
    (if Toplevel.is_proof st then OuterKeyword.is_theory else OuterKeyword.is_theory_begin) hist);
wenzelm@29348
    88
wenzelm@29348
    89
fun kill_proof () = edit_history 1 (fn st => fn hist =>
wenzelm@29348
    90
  if Toplevel.is_proof st then find_and_undo OuterKeyword.is_theory hist
wenzelm@29348
    91
  else raise Toplevel.UNDEF);
wenzelm@29348
    92
wenzelm@29348
    93
end;
wenzelm@29348
    94
wenzelm@29348
    95
wenzelm@29348
    96
(* interactive state transformations *)
wenzelm@29348
    97
wenzelm@29348
    98
fun op >> tr =
wenzelm@29348
    99
  (case Toplevel.transition true tr (state ()) of
wenzelm@29348
   100
    NONE => false
wenzelm@29348
   101
  | SOME (_, SOME err) => (set_exn (SOME err); Toplevel.error_msg tr err; true)
wenzelm@29348
   102
  | SOME (st', NONE) =>
wenzelm@29348
   103
      let
wenzelm@29348
   104
        val name = Toplevel.name_of tr;
wenzelm@29348
   105
        val _ = if OuterKeyword.is_theory_begin name then init () else ();
wenzelm@29348
   106
        val _ =
wenzelm@29348
   107
          if OuterKeyword.is_regular name
wenzelm@29348
   108
          then edit_history 1 (fn st => fn hist => (st', (st, tr) :: hist)) else ();
wenzelm@29348
   109
      in true end);
wenzelm@29348
   110
wenzelm@29348
   111
fun op >>> [] = ()
wenzelm@29348
   112
  | op >>> (tr :: trs) = if op >> tr then op >>> trs else ();
wenzelm@29348
   113
wenzelm@29348
   114
wenzelm@29348
   115
(* toplevel loop *)
wenzelm@29348
   116
wenzelm@32738
   117
val crashes = Unsynchronized.ref ([]: exn list);
wenzelm@29348
   118
wenzelm@29348
   119
local
wenzelm@29348
   120
wenzelm@29348
   121
fun raw_loop secure src =
wenzelm@29348
   122
  let
wenzelm@29348
   123
    fun check_secure () =
wenzelm@29348
   124
      (if secure then warning "Secure loop -- cannot exit to ML" else (); secure);
wenzelm@29348
   125
  in
wenzelm@29348
   126
    (case Source.get_single (Source.set_prompt Source.default_prompt src) of
wenzelm@29348
   127
      NONE => if secure then quit () else ()
wenzelm@29348
   128
    | SOME (tr, src') => if op >> tr orelse check_secure () then raw_loop secure src' else ())
wenzelm@29370
   129
    handle exn =>
wenzelm@31478
   130
      (Output.error_msg (ML_Compiler.exn_message exn)
wenzelm@29370
   131
        handle crash =>
wenzelm@32738
   132
          (CRITICAL (fn () => Unsynchronized.change crashes (cons crash));
wenzelm@29370
   133
            warning "Recovering from Isar toplevel crash -- see also Isar.crashes");
wenzelm@29370
   134
          raw_loop secure src)
wenzelm@29348
   135
  end;
wenzelm@29348
   136
wenzelm@29348
   137
in
wenzelm@29348
   138
wenzelm@29348
   139
fun toplevel_loop {init = do_init, welcome, sync, secure} =
wenzelm@29348
   140
 (Context.set_thread_data NONE;
wenzelm@32739
   141
  Secure.open_unsynchronized ();
wenzelm@32486
   142
  if do_init then init () else ();
wenzelm@29348
   143
  if welcome then writeln (Session.welcome ()) else ();
wenzelm@29348
   144
  uninterruptible (fn _ => fn () => raw_loop secure (OuterSyntax.isar sync)) ());
wenzelm@29348
   145
wenzelm@29348
   146
end;
wenzelm@29348
   147
wenzelm@29348
   148
fun loop () =
wenzelm@29348
   149
  toplevel_loop {init = false, welcome = false, sync = false, secure = Secure.is_secure ()};
wenzelm@29348
   150
wenzelm@29348
   151
fun main () =
wenzelm@29348
   152
  toplevel_loop {init = true, welcome = true, sync = false, secure = Secure.is_secure ()};
wenzelm@29348
   153
wenzelm@29348
   154
wenzelm@29348
   155
wenzelm@30173
   156
(** command syntax **)
wenzelm@28300
   157
wenzelm@28300
   158
local
wenzelm@28300
   159
wenzelm@30173
   160
structure P = OuterParse and K = OuterKeyword;
wenzelm@28300
   161
val op >> = Scan.>>;
wenzelm@28300
   162
wenzelm@28300
   163
in
wenzelm@28300
   164
wenzelm@30173
   165
(* global history *)
wenzelm@30173
   166
wenzelm@30173
   167
val _ =
wenzelm@30173
   168
  OuterSyntax.improper_command "init_toplevel" "init toplevel point-of-interest" K.control
wenzelm@30173
   169
    (Scan.succeed (Toplevel.no_timing o Toplevel.imperative init));
wenzelm@30173
   170
wenzelm@30173
   171
val _ =
wenzelm@30173
   172
  OuterSyntax.improper_command "linear_undo" "undo commands" K.control
wenzelm@30173
   173
    (Scan.optional P.nat 1 >>
wenzelm@30173
   174
      (fn n => Toplevel.no_timing o Toplevel.imperative (fn () => linear_undo n)));
wenzelm@30173
   175
wenzelm@30173
   176
val _ =
wenzelm@30173
   177
  OuterSyntax.improper_command "undo" "undo commands (skipping closed proofs)" K.control
wenzelm@30173
   178
    (Scan.optional P.nat 1 >>
wenzelm@30173
   179
      (fn n => Toplevel.no_timing o Toplevel.imperative (fn () => undo n)));
wenzelm@30173
   180
wenzelm@30173
   181
val _ =
wenzelm@30173
   182
  OuterSyntax.improper_command "undos_proof" "undo commands (skipping closed proofs)" K.control
wenzelm@30173
   183
    (Scan.optional P.nat 1 >> (fn n => Toplevel.no_timing o
wenzelm@30173
   184
      Toplevel.keep (fn state =>
wenzelm@30173
   185
        if Toplevel.is_proof state then (undo n; print ()) else raise Toplevel.UNDEF)));
wenzelm@30173
   186
wenzelm@30173
   187
val _ =
wenzelm@30173
   188
  OuterSyntax.improper_command "cannot_undo" "partial undo -- Proof General legacy" K.control
wenzelm@30173
   189
    (P.name >>
wenzelm@30173
   190
      (fn "end" => Toplevel.no_timing o Toplevel.imperative (fn () => undo 1)
wenzelm@30173
   191
        | txt => Toplevel.imperative (fn () => error ("Cannot undo " ^ quote txt))));
wenzelm@30173
   192
wenzelm@30173
   193
val _ =
wenzelm@30173
   194
  OuterSyntax.improper_command "kill" "kill partial proof or theory development" K.control
wenzelm@30173
   195
    (Scan.succeed (Toplevel.no_timing o Toplevel.imperative kill));
wenzelm@30173
   196
wenzelm@26605
   197
end;
wenzelm@26605
   198
wenzelm@28300
   199
end;