src/Pure/Isar/proof.ML
author wenzelm
Thu Sep 18 14:06:58 2008 +0200 (2008-09-18)
changeset 28289 efd53393412b
parent 28278 7af26c1f02ec
child 28375 c879d88d038a
permissions -rw-r--r--
show: non-critical testing;
wenzelm@5820
     1
(*  Title:      Pure/Isar/proof.ML
wenzelm@5820
     2
    ID:         $Id$
wenzelm@5820
     3
    Author:     Markus Wenzel, TU Muenchen
wenzelm@5820
     4
wenzelm@19000
     5
The Isar/VM proof language interpreter: maintains a structured flow of
wenzelm@19000
     6
context elements, goals, refinements, and facts.
wenzelm@5820
     7
*)
wenzelm@5820
     8
wenzelm@5820
     9
signature PROOF =
wenzelm@5820
    10
sig
wenzelm@23639
    11
  type context = Context.proof
wenzelm@23639
    12
  type method = Method.method
wenzelm@5820
    13
  type state
wenzelm@17359
    14
  val init: context -> state
wenzelm@17359
    15
  val level: state -> int
wenzelm@17359
    16
  val assert_bottom: bool -> state -> state
wenzelm@5820
    17
  val context_of: state -> context
wenzelm@5820
    18
  val theory_of: state -> theory
wenzelm@13377
    19
  val map_context: (context -> context) -> state -> state
wenzelm@28278
    20
  val map_contexts: (context -> context) -> state -> state
wenzelm@17976
    21
  val add_binds_i: (indexname * term option) list -> state -> state
wenzelm@26251
    22
  val put_thms: bool -> string * thm list option -> state -> state
wenzelm@6091
    23
  val the_facts: state -> thm list
wenzelm@9469
    24
  val the_fact: state -> thm
wenzelm@17450
    25
  val put_facts: thm list option -> state -> state
wenzelm@6891
    26
  val assert_forward: state -> state
wenzelm@17359
    27
  val assert_chain: state -> state
wenzelm@9469
    28
  val assert_forward_or_chain: state -> state
wenzelm@5820
    29
  val assert_backward: state -> state
wenzelm@8206
    30
  val assert_no_chain: state -> state
wenzelm@5820
    31
  val enter_forward: state -> state
wenzelm@24543
    32
  val goal_message: (unit -> Pretty.T) -> state -> state
wenzelm@17359
    33
  val get_goal: state -> context * (thm list * thm)
wenzelm@19995
    34
  val schematic_goal: state -> bool
wenzelm@16539
    35
  val show_main_goal: bool ref
wenzelm@6529
    36
  val verbose: bool ref
wenzelm@12423
    37
  val pretty_state: int -> state -> Pretty.T list
wenzelm@10360
    38
  val pretty_goals: bool -> state -> Pretty.T list
wenzelm@17112
    39
  val refine: Method.text -> state -> state Seq.seq
wenzelm@17112
    40
  val refine_end: Method.text -> state -> state Seq.seq
wenzelm@18908
    41
  val refine_insert: thm list -> state -> state
wenzelm@20208
    42
  val goal_tac: thm -> int -> tactic
wenzelm@17359
    43
  val refine_goals: (context -> thm -> unit) -> context -> thm list -> state -> state Seq.seq
wenzelm@5936
    44
  val match_bind: (string list * string) list -> state -> state
wenzelm@5936
    45
  val match_bind_i: (term list * term) list -> state -> state
wenzelm@8617
    46
  val let_bind: (string list * string) list -> state -> state
wenzelm@8617
    47
  val let_bind_i: (term list * term) list -> state -> state
wenzelm@28083
    48
  val fix: (Name.binding * string option * mixfix) list -> state -> state
wenzelm@28083
    49
  val fix_i: (Name.binding * typ option * mixfix) list -> state -> state
wenzelm@20224
    50
  val assm: Assumption.export ->
wenzelm@28084
    51
    (Attrib.binding * (string * string list) list) list -> state -> state
wenzelm@20224
    52
  val assm_i: Assumption.export ->
wenzelm@28083
    53
    ((Name.binding * attribute list) * (term * term list) list) list -> state -> state
wenzelm@28084
    54
  val assume: (Attrib.binding * (string * string list) list) list -> state -> state
wenzelm@28083
    55
  val assume_i: ((Name.binding * attribute list) * (term * term list) list) list ->
wenzelm@28083
    56
    state -> state
wenzelm@28084
    57
  val presume: (Attrib.binding * (string * string list) list) list -> state -> state
wenzelm@28083
    58
  val presume_i: ((Name.binding * attribute list) * (term * term list) list) list ->
wenzelm@28083
    59
    state -> state
wenzelm@28084
    60
  val def: (Attrib.binding * ((Name.binding * mixfix) * (string * string list))) list ->
wenzelm@28084
    61
    state -> state
wenzelm@28083
    62
  val def_i: ((Name.binding * attribute list) *
wenzelm@28083
    63
    ((Name.binding * mixfix) * (term * term list))) list -> state -> state
wenzelm@17359
    64
  val chain: state -> state
wenzelm@17359
    65
  val chain_facts: thm list -> state -> state
wenzelm@26336
    66
  val get_thmss: state -> (Facts.ref * Attrib.src list) list -> thm list
wenzelm@28084
    67
  val note_thmss: (Attrib.binding * (Facts.ref * Attrib.src list) list) list -> state -> state
wenzelm@28083
    68
  val note_thmss_i: ((Name.binding * attribute list) *
wenzelm@18728
    69
    (thm list * attribute list) list) list -> state -> state
wenzelm@26336
    70
  val from_thmss: ((Facts.ref * Attrib.src list) list) list -> state -> state
wenzelm@18728
    71
  val from_thmss_i: ((thm list * attribute list) list) list -> state -> state
wenzelm@26336
    72
  val with_thmss: ((Facts.ref * Attrib.src list) list) list -> state -> state
wenzelm@18728
    73
  val with_thmss_i: ((thm list * attribute list) list) list -> state -> state
wenzelm@26336
    74
  val using: ((Facts.ref * Attrib.src list) list) list -> state -> state
wenzelm@18728
    75
  val using_i: ((thm list * attribute list) list) list -> state -> state
wenzelm@26336
    76
  val unfolding: ((Facts.ref * Attrib.src list) list) list -> state -> state
wenzelm@18728
    77
  val unfolding_i: ((thm list * attribute list) list) list -> state -> state
wenzelm@17112
    78
  val invoke_case: string * string option list * Attrib.src list -> state -> state
wenzelm@18728
    79
  val invoke_case_i: string * string option list * attribute list -> state -> state
wenzelm@17359
    80
  val begin_block: state -> state
wenzelm@17359
    81
  val next_block: state -> state
wenzelm@20309
    82
  val end_block: state -> state
wenzelm@17112
    83
  val proof: Method.text option -> state -> state Seq.seq
wenzelm@17112
    84
  val defer: int option -> state -> state Seq.seq
wenzelm@17112
    85
  val prefer: int -> state -> state Seq.seq
wenzelm@17112
    86
  val apply: Method.text -> state -> state Seq.seq
wenzelm@17112
    87
  val apply_end: Method.text -> state -> state Seq.seq
wenzelm@17359
    88
  val local_goal: (context -> ((string * string) * (string * thm list) list) -> unit) ->
wenzelm@18728
    89
    (theory -> 'a -> attribute) ->
wenzelm@17359
    90
    (context * 'b list -> context * (term list list * (context -> context))) ->
wenzelm@18124
    91
    string -> Method.text option -> (thm list list -> state -> state Seq.seq) ->
wenzelm@28083
    92
    ((Name.binding * 'a list) * 'b) list -> state -> state
wenzelm@17359
    93
  val local_qed: Method.text option * bool -> state -> state Seq.seq
wenzelm@21442
    94
  val theorem: Method.text option -> (thm list list -> context -> context) ->
wenzelm@21362
    95
    (string * string list) list list -> context -> state
wenzelm@21442
    96
  val theorem_i: Method.text option -> (thm list list -> context -> context) ->
wenzelm@21362
    97
    (term * term list) list list -> context -> state
wenzelm@20363
    98
  val global_qed: Method.text option * bool -> state -> context
wenzelm@17359
    99
  val local_terminal_proof: Method.text * Method.text option -> state -> state Seq.seq
wenzelm@17359
   100
  val local_default_proof: state -> state Seq.seq
wenzelm@17359
   101
  val local_immediate_proof: state -> state Seq.seq
wenzelm@17359
   102
  val local_done_proof: state -> state Seq.seq
wenzelm@17359
   103
  val local_skip_proof: bool -> state -> state Seq.seq
wenzelm@20363
   104
  val global_terminal_proof: Method.text * Method.text option -> state -> context
wenzelm@20363
   105
  val global_default_proof: state -> context
wenzelm@20363
   106
  val global_immediate_proof: state -> context
wenzelm@20363
   107
  val global_done_proof: state -> context
wenzelm@20363
   108
  val global_skip_proof: bool -> state -> context
wenzelm@18124
   109
  val have: Method.text option -> (thm list list -> state -> state Seq.seq) ->
wenzelm@28084
   110
    (Attrib.binding * (string * string list) list) list -> bool -> state -> state
wenzelm@18124
   111
  val have_i: Method.text option -> (thm list list -> state -> state Seq.seq) ->
wenzelm@28083
   112
    ((Name.binding * attribute list) * (term * term list) list) list -> bool -> state -> state
wenzelm@18124
   113
  val show: Method.text option -> (thm list list -> state -> state Seq.seq) ->
wenzelm@28084
   114
    (Attrib.binding * (string * string list) list) list -> bool -> state -> state
wenzelm@18124
   115
  val show_i: Method.text option -> (thm list list -> state -> state Seq.seq) ->
wenzelm@28083
   116
    ((Name.binding * attribute list) * (term * term list) list) list -> bool -> state -> state
wenzelm@5820
   117
end;
wenzelm@5820
   118
wenzelm@13377
   119
structure Proof: PROOF =
wenzelm@5820
   120
struct
wenzelm@5820
   121
wenzelm@20309
   122
type context = Context.proof;
wenzelm@17112
   123
type method = Method.method;
wenzelm@16813
   124
wenzelm@5820
   125
wenzelm@5820
   126
(** proof state **)
wenzelm@5820
   127
wenzelm@17359
   128
(* datatype state *)
wenzelm@5820
   129
wenzelm@17112
   130
datatype mode = Forward | Chain | Backward;
wenzelm@5820
   131
wenzelm@17359
   132
datatype state =
wenzelm@17359
   133
  State of node Stack.T
wenzelm@17359
   134
and node =
wenzelm@7176
   135
  Node of
wenzelm@7176
   136
   {context: context,
wenzelm@7176
   137
    facts: thm list option,
wenzelm@7176
   138
    mode: mode,
wenzelm@17359
   139
    goal: goal option}
wenzelm@17359
   140
and goal =
wenzelm@17359
   141
  Goal of
wenzelm@25958
   142
   {statement: (string * Position.T) * term list list,
wenzelm@25958
   143
                                          (*goal kind and statement (starting with vars)*)
wenzelm@25958
   144
    messages: (unit -> Pretty.T) list,    (*persistent messages (hints etc.)*)
wenzelm@25958
   145
    using: thm list,                      (*goal facts*)
wenzelm@25958
   146
    goal: thm,                            (*subgoals ==> statement*)
wenzelm@17859
   147
    before_qed: Method.text option,
wenzelm@18124
   148
    after_qed:
wenzelm@18124
   149
      (thm list list -> state -> state Seq.seq) *
wenzelm@20363
   150
      (thm list list -> context -> context)};
wenzelm@17359
   151
wenzelm@24543
   152
fun make_goal (statement, messages, using, goal, before_qed, after_qed) =
wenzelm@24543
   153
  Goal {statement = statement, messages = messages, using = using, goal = goal,
wenzelm@17859
   154
    before_qed = before_qed, after_qed = after_qed};
wenzelm@5820
   155
wenzelm@7176
   156
fun make_node (context, facts, mode, goal) =
wenzelm@7176
   157
  Node {context = context, facts = facts, mode = mode, goal = goal};
wenzelm@7176
   158
wenzelm@17359
   159
fun map_node f (Node {context, facts, mode, goal}) =
wenzelm@17359
   160
  make_node (f (context, facts, mode, goal));
wenzelm@5820
   161
wenzelm@21727
   162
val init_context =
wenzelm@21727
   163
  ProofContext.set_stmt true #> ProofContext.reset_naming;
wenzelm@21727
   164
wenzelm@21466
   165
fun init ctxt =
wenzelm@21727
   166
  State (Stack.init (make_node (init_context ctxt, NONE, Forward, NONE)));
wenzelm@5820
   167
wenzelm@17359
   168
fun current (State st) = Stack.top st |> (fn Node node => node);
wenzelm@21274
   169
fun map_current f (State st) = State (Stack.map_top (map_node f) st);
wenzelm@28278
   170
fun map_all f (State st) = State (Stack.map_all (map_node f) st);
wenzelm@12045
   171
wenzelm@5820
   172
wenzelm@5820
   173
wenzelm@5820
   174
(** basic proof state operations **)
wenzelm@5820
   175
wenzelm@17359
   176
(* block structure *)
wenzelm@17359
   177
wenzelm@17359
   178
fun open_block (State st) = State (Stack.push st);
wenzelm@17359
   179
wenzelm@18678
   180
fun close_block (State st) = State (Stack.pop st)
wenzelm@18678
   181
  handle Empty => error "Unbalanced block parentheses";
wenzelm@17359
   182
wenzelm@17359
   183
fun level (State st) = Stack.level st;
wenzelm@17359
   184
wenzelm@17359
   185
fun assert_bottom b state =
wenzelm@17359
   186
  let val b' = (level state <= 2) in
wenzelm@18678
   187
    if b andalso not b' then error "Not at bottom of proof!"
wenzelm@18678
   188
    else if not b andalso b' then error "Already at bottom of proof!"
wenzelm@17359
   189
    else state
wenzelm@17359
   190
  end;
wenzelm@17359
   191
wenzelm@17359
   192
wenzelm@5820
   193
(* context *)
wenzelm@5820
   194
wenzelm@17359
   195
val context_of = #context o current;
wenzelm@5820
   196
val theory_of = ProofContext.theory_of o context_of;
wenzelm@5820
   197
wenzelm@17359
   198
fun map_context f =
wenzelm@17359
   199
  map_current (fn (ctxt, facts, mode, goal) => (f ctxt, facts, mode, goal));
wenzelm@5820
   200
wenzelm@17359
   201
fun map_context_result f state =
wenzelm@17859
   202
  f (context_of state) ||> (fn ctxt => map_context (K ctxt) state);
wenzelm@5820
   203
wenzelm@28278
   204
fun map_contexts f = map_all (fn (ctxt, facts, mode, goal) => (f ctxt, facts, mode, goal));
wenzelm@28278
   205
wenzelm@10809
   206
val add_binds_i = map_context o ProofContext.add_binds_i;
wenzelm@26251
   207
val put_thms = map_context oo ProofContext.put_thms;
wenzelm@5820
   208
wenzelm@5820
   209
wenzelm@5820
   210
(* facts *)
wenzelm@5820
   211
wenzelm@17359
   212
val get_facts = #facts o current;
wenzelm@17359
   213
wenzelm@17359
   214
fun the_facts state =
wenzelm@17359
   215
  (case get_facts state of SOME facts => facts
wenzelm@18678
   216
  | NONE => error "No current facts available");
wenzelm@5820
   217
wenzelm@9469
   218
fun the_fact state =
wenzelm@17359
   219
  (case the_facts state of [thm] => thm
wenzelm@18678
   220
  | _ => error "Single theorem expected");
wenzelm@7605
   221
wenzelm@17359
   222
fun put_facts facts =
wenzelm@19078
   223
  map_current (fn (ctxt, _, mode, goal) => (ctxt, facts, mode, goal)) #>
wenzelm@26251
   224
  put_thms true (AutoBind.thisN, facts);
wenzelm@5820
   225
wenzelm@17359
   226
fun these_factss more_facts (named_factss, state) =
wenzelm@19482
   227
  (named_factss, state |> put_facts (SOME (maps snd named_factss @ more_facts)));
wenzelm@5820
   228
wenzelm@17359
   229
fun export_facts inner outer =
wenzelm@17359
   230
  (case get_facts inner of
wenzelm@20309
   231
    NONE => put_facts NONE outer
wenzelm@17359
   232
  | SOME thms =>
wenzelm@17359
   233
      thms
wenzelm@20309
   234
      |> ProofContext.export (context_of inner) (context_of outer)
wenzelm@20309
   235
      |> (fn ths => put_facts (SOME ths) outer));
wenzelm@5820
   236
wenzelm@5820
   237
wenzelm@5820
   238
(* mode *)
wenzelm@5820
   239
wenzelm@17359
   240
val get_mode = #mode o current;
wenzelm@5820
   241
fun put_mode mode = map_current (fn (ctxt, facts, _, goal) => (ctxt, facts, mode, goal));
wenzelm@5820
   242
wenzelm@17359
   243
val mode_name = (fn Forward => "state" | Chain => "chain" | Backward => "prove");
wenzelm@5820
   244
wenzelm@5820
   245
fun assert_mode pred state =
wenzelm@5820
   246
  let val mode = get_mode state in
wenzelm@5820
   247
    if pred mode then state
wenzelm@18678
   248
    else error ("Illegal application of proof command in " ^ quote (mode_name mode) ^ " mode")
wenzelm@5820
   249
  end;
wenzelm@5820
   250
wenzelm@19308
   251
val assert_forward = assert_mode (fn mode => mode = Forward);
wenzelm@19308
   252
val assert_chain = assert_mode (fn mode => mode = Chain);
wenzelm@19308
   253
val assert_forward_or_chain = assert_mode (fn mode => mode = Forward orelse mode = Chain);
wenzelm@19308
   254
val assert_backward = assert_mode (fn mode => mode = Backward);
wenzelm@19308
   255
val assert_no_chain = assert_mode (fn mode => mode <> Chain);
wenzelm@5820
   256
wenzelm@17359
   257
val enter_forward = put_mode Forward;
wenzelm@17359
   258
val enter_chain = put_mode Chain;
wenzelm@17359
   259
val enter_backward = put_mode Backward;
wenzelm@5820
   260
wenzelm@17359
   261
wenzelm@17359
   262
(* current goal *)
wenzelm@17359
   263
wenzelm@17359
   264
fun current_goal state =
wenzelm@17359
   265
  (case current state of
wenzelm@17359
   266
    {context, goal = SOME (Goal goal), ...} => (context, goal)
wenzelm@18678
   267
  | _ => error "No current goal!");
wenzelm@5820
   268
wenzelm@17359
   269
fun assert_current_goal g state =
wenzelm@17359
   270
  let val g' = can current_goal state in
wenzelm@18678
   271
    if g andalso not g' then error "No goal in this block!"
wenzelm@18678
   272
    else if not g andalso g' then error "Goal present in this block!"
wenzelm@17359
   273
    else state
wenzelm@17359
   274
  end;
wenzelm@6776
   275
wenzelm@17359
   276
fun put_goal goal = map_current (fn (ctxt, using, mode, _) => (ctxt, using, mode, goal));
wenzelm@17359
   277
wenzelm@17859
   278
val before_qed = #before_qed o #2 o current_goal;
wenzelm@17859
   279
wenzelm@17359
   280
wenzelm@17359
   281
(* nested goal *)
wenzelm@5820
   282
wenzelm@17359
   283
fun map_goal f g (State (Node {context, facts, mode, goal = SOME goal}, nodes)) =
wenzelm@17359
   284
      let
wenzelm@24543
   285
        val Goal {statement, messages, using, goal, before_qed, after_qed} = goal;
wenzelm@24543
   286
        val goal' = make_goal (g (statement, messages, using, goal, before_qed, after_qed));
wenzelm@17359
   287
      in State (make_node (f context, facts, mode, SOME goal'), nodes) end
wenzelm@17359
   288
  | map_goal f g (State (nd, node :: nodes)) =
wenzelm@17359
   289
      let val State (node', nodes') = map_goal f g (State (node, nodes))
wenzelm@17359
   290
      in map_context f (State (nd, node' :: nodes')) end
wenzelm@17359
   291
  | map_goal _ _ state = state;
wenzelm@5820
   292
wenzelm@24556
   293
fun set_goal goal = map_goal I (fn (statement, _, using, _, before_qed, after_qed) =>
wenzelm@24556
   294
  (statement, [], using, goal, before_qed, after_qed));
wenzelm@19188
   295
wenzelm@24543
   296
fun goal_message msg = map_goal I (fn (statement, messages, using, goal, before_qed, after_qed) =>
wenzelm@24543
   297
  (statement, msg :: messages, using, goal, before_qed, after_qed));
wenzelm@24543
   298
wenzelm@24556
   299
fun using_facts using = map_goal I (fn (statement, _, _, goal, before_qed, after_qed) =>
wenzelm@24556
   300
  (statement, [], using, goal, before_qed, after_qed));
wenzelm@17359
   301
wenzelm@17359
   302
local
wenzelm@17359
   303
  fun find i state =
wenzelm@17359
   304
    (case try current_goal state of
wenzelm@17359
   305
      SOME (ctxt, goal) => (ctxt, (i, goal))
wenzelm@18678
   306
    | NONE => find (i + 1) (close_block state handle ERROR _ => error "No goal present"));
wenzelm@17359
   307
in val find_goal = find 0 end;
wenzelm@17359
   308
wenzelm@17359
   309
fun get_goal state =
wenzelm@17359
   310
  let val (ctxt, (_, {using, goal, ...})) = find_goal state
wenzelm@17359
   311
  in (ctxt, (using, goal)) end;
wenzelm@5820
   312
wenzelm@19995
   313
fun schematic_goal state =
wenzelm@21362
   314
  let val (_, (_, {statement = (_, propss), ...})) = find_goal state in
wenzelm@21362
   315
    exists (exists (Term.exists_subterm Term.is_Var)) propss orelse
wenzelm@21362
   316
    exists (exists (Term.exists_type (Term.exists_subtype Term.is_TVar))) propss
wenzelm@21362
   317
  end;
wenzelm@19995
   318
wenzelm@5820
   319
wenzelm@5820
   320
wenzelm@12423
   321
(** pretty_state **)
wenzelm@5820
   322
nipkow@13869
   323
val show_main_goal = ref false;
wenzelm@16539
   324
val verbose = ProofContext.verbose;
nipkow@13698
   325
wenzelm@24961
   326
val pretty_goals_local = Display.pretty_goals_aux o Syntax.pp;
wenzelm@12085
   327
skalberg@15531
   328
fun pretty_facts _ _ NONE = []
skalberg@15531
   329
  | pretty_facts s ctxt (SOME ths) =
wenzelm@12055
   330
      [Pretty.big_list (s ^ "this:") (map (ProofContext.pretty_thm ctxt) ths), Pretty.str ""];
wenzelm@6756
   331
wenzelm@17359
   332
fun pretty_state nr state =
wenzelm@5820
   333
  let
wenzelm@17359
   334
    val {context, facts, mode, goal = _} = current state;
wenzelm@5820
   335
wenzelm@5820
   336
    fun levels_up 0 = ""
wenzelm@17359
   337
      | levels_up 1 = "1 level up"
wenzelm@17359
   338
      | levels_up i = string_of_int i ^ " levels up";
wenzelm@5820
   339
wenzelm@11556
   340
    fun subgoals 0 = ""
wenzelm@17359
   341
      | subgoals 1 = "1 subgoal"
wenzelm@17359
   342
      | subgoals n = string_of_int n ^ " subgoals";
wenzelm@17359
   343
wenzelm@17359
   344
    fun description strs =
wenzelm@17359
   345
      (case filter_out (equal "") strs of [] => ""
wenzelm@17359
   346
      | strs' => enclose " (" ")" (commas strs'));
wenzelm@12146
   347
wenzelm@24550
   348
    fun prt_goal (SOME (ctxt, (i,
wenzelm@25958
   349
            {statement = ((_, pos), _), messages, using, goal, before_qed, after_qed}))) =
wenzelm@17359
   350
          pretty_facts "using " ctxt
wenzelm@17359
   351
            (if mode <> Backward orelse null using then NONE else SOME using) @
wenzelm@21442
   352
          [Pretty.str ("goal" ^
wenzelm@21442
   353
            description [levels_up (i div 2), subgoals (Thm.nprems_of goal)] ^ ":")] @
wenzelm@23639
   354
          pretty_goals_local ctxt Markup.subgoal
wenzelm@24543
   355
            (true, ! show_main_goal) (! Display.goals_limit) goal @
wenzelm@25958
   356
          (map (fn msg => Position.setmp_thread_data pos msg ()) (rev messages))
wenzelm@17359
   357
      | prt_goal NONE = [];
wenzelm@6848
   358
wenzelm@17359
   359
    val prt_ctxt =
wenzelm@17359
   360
      if ! verbose orelse mode = Forward then ProofContext.pretty_context context
wenzelm@18670
   361
      else if mode = Backward then ProofContext.pretty_ctxt context
wenzelm@7575
   362
      else [];
wenzelm@17359
   363
  in
wenzelm@17359
   364
    [Pretty.str ("proof (" ^ mode_name mode ^ "): step " ^ string_of_int nr ^
wenzelm@17359
   365
      (if ! verbose then ", depth " ^ string_of_int (level state div 2 - 1) else "")),
wenzelm@17359
   366
      Pretty.str ""] @
wenzelm@17359
   367
    (if null prt_ctxt then [] else prt_ctxt @ [Pretty.str ""]) @
wenzelm@17359
   368
    (if ! verbose orelse mode = Forward then
wenzelm@17359
   369
       pretty_facts "" context facts @ prt_goal (try find_goal state)
wenzelm@17359
   370
     else if mode = Chain then pretty_facts "picking " context facts
wenzelm@17359
   371
     else prt_goal (try find_goal state))
wenzelm@17359
   372
  end;
wenzelm@5820
   373
wenzelm@12085
   374
fun pretty_goals main state =
wenzelm@19188
   375
  let val (ctxt, (_, goal)) = get_goal state
wenzelm@23639
   376
  in pretty_goals_local ctxt Markup.none (false, main) (! Display.goals_limit) goal end;
wenzelm@10320
   377
wenzelm@5820
   378
wenzelm@5820
   379
wenzelm@5820
   380
(** proof steps **)
wenzelm@5820
   381
wenzelm@17359
   382
(* refine via method *)
wenzelm@5820
   383
wenzelm@8234
   384
local
wenzelm@8234
   385
wenzelm@16146
   386
fun goalN i = "goal" ^ string_of_int i;
wenzelm@16146
   387
fun goals st = map goalN (1 upto Thm.nprems_of st);
wenzelm@16146
   388
wenzelm@16146
   389
fun no_goal_cases st = map (rpair NONE) (goals st);
wenzelm@16146
   390
wenzelm@16146
   391
fun goal_cases st =
wenzelm@18607
   392
  RuleCases.make_common true (Thm.theory_of_thm st, Thm.prop_of st) (map (rpair []) (goals st));
wenzelm@16146
   393
wenzelm@25958
   394
fun apply_method current_context pos meth state =
wenzelm@6848
   395
  let
wenzelm@24556
   396
    val (goal_ctxt, (_, {statement, messages = _, using, goal, before_qed, after_qed})) =
wenzelm@24543
   397
      find_goal state;
wenzelm@25958
   398
    val ctxt = if current_context then context_of state else goal_ctxt;
wenzelm@16146
   399
  in
wenzelm@25958
   400
    Method.apply pos meth ctxt using goal |> Seq.map (fn (meth_cases, goal') =>
wenzelm@6848
   401
      state
wenzelm@16146
   402
      |> map_goal
wenzelm@18475
   403
          (ProofContext.add_cases false (no_goal_cases goal @ goal_cases goal') #>
wenzelm@18475
   404
           ProofContext.add_cases true meth_cases)
wenzelm@24556
   405
          (K (statement, [], using, goal', before_qed, after_qed)))
wenzelm@16146
   406
  end;
wenzelm@5820
   407
wenzelm@19188
   408
fun select_goals n meth state =
wenzelm@19224
   409
  state
wenzelm@19224
   410
  |> (#2 o #2 o get_goal)
wenzelm@21687
   411
  |> ALLGOALS Goal.conjunction_tac
wenzelm@19224
   412
  |> Seq.maps (fn goal =>
wenzelm@19188
   413
    state
wenzelm@21687
   414
    |> Seq.lift set_goal (Goal.extract 1 n goal |> Seq.maps (Goal.conjunction_tac 1))
wenzelm@19188
   415
    |> Seq.maps meth
wenzelm@19188
   416
    |> Seq.maps (fn state' => state'
wenzelm@19188
   417
      |> Seq.lift set_goal (Goal.retrofit 1 n (#2 (#2 (get_goal state'))) goal))
wenzelm@23360
   418
    |> Seq.maps (apply_method true Position.none (K Method.succeed)));
wenzelm@19188
   419
wenzelm@17112
   420
fun apply_text cc text state =
wenzelm@17112
   421
  let
wenzelm@17112
   422
    val thy = theory_of state;
wenzelm@23360
   423
    val pos_of = #2 o Args.dest_src;
wenzelm@17112
   424
wenzelm@23360
   425
    fun eval (Method.Basic (m, pos)) = apply_method cc pos m
wenzelm@23360
   426
      | eval (Method.Source src) = apply_method cc (pos_of src) (Method.method thy src)
wenzelm@23360
   427
      | eval (Method.Source_i src) = apply_method cc (pos_of src) (Method.method_i thy src)
wenzelm@17112
   428
      | eval (Method.Then txts) = Seq.EVERY (map eval txts)
wenzelm@17112
   429
      | eval (Method.Orelse txts) = Seq.FIRST (map eval txts)
wenzelm@17112
   430
      | eval (Method.Try txt) = Seq.TRY (eval txt)
wenzelm@19188
   431
      | eval (Method.Repeat1 txt) = Seq.REPEAT1 (eval txt)
wenzelm@19188
   432
      | eval (Method.SelectGoals (n, txt)) = select_goals n (eval txt);
wenzelm@17112
   433
  in eval text state end;
wenzelm@17112
   434
wenzelm@8234
   435
in
wenzelm@8234
   436
wenzelm@17112
   437
val refine = apply_text true;
wenzelm@17112
   438
val refine_end = apply_text false;
wenzelm@8234
   439
wenzelm@18908
   440
fun refine_insert [] = I
wenzelm@23360
   441
  | refine_insert ths = Seq.hd o refine (Method.Basic (K (Method.insert ths), Position.none));
wenzelm@18908
   442
wenzelm@8234
   443
end;
wenzelm@8234
   444
wenzelm@5820
   445
wenzelm@17359
   446
(* refine via sub-proof *)
wenzelm@17359
   447
wenzelm@20208
   448
fun goal_tac rule =
wenzelm@21687
   449
  Goal.norm_hhf_tac THEN' Tactic.rtac rule THEN_ALL_NEW
wenzelm@21687
   450
    (Goal.norm_hhf_tac THEN' (SUBGOAL (fn (goal, i) =>
wenzelm@18186
   451
      if can Logic.unprotect (Logic.strip_assums_concl goal) then
wenzelm@18186
   452
        Tactic.etac Drule.protectI i
wenzelm@18186
   453
      else all_tac)));
wenzelm@11816
   454
wenzelm@19915
   455
fun refine_goals print_rule inner raw_rules state =
wenzelm@19915
   456
  let
wenzelm@19915
   457
    val (outer, (_, goal)) = get_goal state;
wenzelm@20208
   458
    fun refine rule st = (print_rule outer rule; FINDGOAL (goal_tac rule) st);
wenzelm@19915
   459
  in
wenzelm@19915
   460
    raw_rules
wenzelm@20309
   461
    |> ProofContext.goal_export inner outer
wenzelm@20309
   462
    |> (fn rules => Seq.lift set_goal (EVERY (map refine rules) goal) state)
wenzelm@19915
   463
  end;
wenzelm@17359
   464
wenzelm@6932
   465
wenzelm@17359
   466
(* conclude_goal *)
wenzelm@6932
   467
wenzelm@18503
   468
fun conclude_goal state goal propss =
wenzelm@5820
   469
  let
wenzelm@19774
   470
    val thy = theory_of state;
wenzelm@5820
   471
    val ctxt = context_of state;
wenzelm@24920
   472
    val string_of_term = Syntax.string_of_term ctxt;
wenzelm@19774
   473
    val string_of_thm = ProofContext.string_of_thm ctxt;
wenzelm@5820
   474
wenzelm@17359
   475
    val ngoals = Thm.nprems_of goal;
wenzelm@19774
   476
    val _ = ngoals = 0 orelse error (Pretty.string_of (Pretty.chunks
wenzelm@23639
   477
      (pretty_goals_local ctxt Markup.none (true, ! show_main_goal) (! Display.goals_limit) goal @
wenzelm@23639
   478
        [Pretty.str (string_of_int ngoals ^ " unsolved goal(s)!")])));
wenzelm@20224
   479
wenzelm@20224
   480
    val extra_hyps = Assumption.extra_hyps ctxt goal;
wenzelm@20224
   481
    val _ = null extra_hyps orelse
wenzelm@20224
   482
      error ("Additional hypotheses:\n" ^ cat_lines (map string_of_term extra_hyps));
wenzelm@5820
   483
wenzelm@23418
   484
    fun lost_structure () = error ("Lost goal structure:\n" ^ string_of_thm goal);
wenzelm@23418
   485
berghofe@23782
   486
    val th = Goal.conclude
wenzelm@23806
   487
      (if length (flat propss) > 1 then Thm.norm_proof goal else goal)
berghofe@23782
   488
      handle THM _ => lost_structure ();
wenzelm@23418
   489
    val goal_propss = filter_out null propss;
wenzelm@23418
   490
    val results =
wenzelm@23418
   491
      Conjunction.elim_balanced (length goal_propss) th
wenzelm@23418
   492
      |> map2 Conjunction.elim_balanced (map length goal_propss)
wenzelm@23418
   493
      handle THM _ => lost_structure ();
wenzelm@23418
   494
    val _ = Unify.matches_list thy (flat goal_propss) (map Thm.prop_of (flat results)) orelse
wenzelm@19774
   495
      error ("Proved a different theorem:\n" ^ string_of_thm th);
wenzelm@23418
   496
wenzelm@23418
   497
    fun recover_result ([] :: pss) thss = [] :: recover_result pss thss
wenzelm@23418
   498
      | recover_result (_ :: pss) (ths :: thss) = ths :: recover_result pss thss
wenzelm@23418
   499
      | recover_result [] [] = []
wenzelm@23418
   500
      | recover_result _ _ = lost_structure ();
wenzelm@23418
   501
  in recover_result propss results end;
wenzelm@5820
   502
wenzelm@5820
   503
wenzelm@5820
   504
wenzelm@5820
   505
(*** structured proof commands ***)
wenzelm@5820
   506
wenzelm@17112
   507
(** context elements **)
wenzelm@5820
   508
wenzelm@17112
   509
(* bindings *)
wenzelm@5820
   510
wenzelm@16813
   511
local
wenzelm@16813
   512
wenzelm@17359
   513
fun gen_bind bind args state =
wenzelm@5820
   514
  state
wenzelm@5820
   515
  |> assert_forward
wenzelm@18308
   516
  |> map_context (bind args #> snd)
wenzelm@17359
   517
  |> put_facts NONE;
wenzelm@5820
   518
wenzelm@16813
   519
in
wenzelm@16813
   520
wenzelm@8617
   521
val match_bind = gen_bind (ProofContext.match_bind false);
wenzelm@8617
   522
val match_bind_i = gen_bind (ProofContext.match_bind_i false);
wenzelm@8617
   523
val let_bind = gen_bind (ProofContext.match_bind true);
wenzelm@8617
   524
val let_bind_i = gen_bind (ProofContext.match_bind_i true);
wenzelm@5820
   525
wenzelm@16813
   526
end;
wenzelm@16813
   527
wenzelm@5820
   528
wenzelm@17359
   529
(* fix *)
wenzelm@9196
   530
wenzelm@12714
   531
local
wenzelm@12714
   532
wenzelm@18670
   533
fun gen_fix add_fixes args =
wenzelm@17359
   534
  assert_forward
wenzelm@19846
   535
  #> map_context (snd o add_fixes args)
wenzelm@17359
   536
  #> put_facts NONE;
wenzelm@5820
   537
wenzelm@16813
   538
in
wenzelm@16813
   539
wenzelm@18670
   540
val fix = gen_fix ProofContext.add_fixes;
wenzelm@18670
   541
val fix_i = gen_fix ProofContext.add_fixes_i;
wenzelm@5820
   542
wenzelm@16813
   543
end;
wenzelm@16813
   544
wenzelm@5820
   545
wenzelm@17359
   546
(* assume etc. *)
wenzelm@5820
   547
wenzelm@16813
   548
local
wenzelm@16813
   549
wenzelm@17112
   550
fun gen_assume asm prep_att exp args state =
wenzelm@5820
   551
  state
wenzelm@5820
   552
  |> assert_forward
wenzelm@17112
   553
  |> map_context_result (asm exp (Attrib.map_specs (prep_att (theory_of state)) args))
wenzelm@17359
   554
  |> these_factss [] |> #2;
wenzelm@6932
   555
wenzelm@16813
   556
in
wenzelm@16813
   557
wenzelm@18728
   558
val assm      = gen_assume ProofContext.add_assms Attrib.attribute;
wenzelm@18670
   559
val assm_i    = gen_assume ProofContext.add_assms_i (K I);
wenzelm@20224
   560
val assume    = assm Assumption.assume_export;
wenzelm@20224
   561
val assume_i  = assm_i Assumption.assume_export;
wenzelm@20224
   562
val presume   = assm Assumption.presume_export;
wenzelm@20224
   563
val presume_i = assm_i Assumption.presume_export;
wenzelm@5820
   564
wenzelm@16813
   565
end;
wenzelm@16813
   566
wenzelm@7271
   567
wenzelm@17359
   568
(* def *)
wenzelm@11891
   569
wenzelm@16813
   570
local
wenzelm@16813
   571
wenzelm@20913
   572
fun gen_def prep_att prep_vars prep_binds args state =
wenzelm@11891
   573
  let
wenzelm@11891
   574
    val _ = assert_forward state;
wenzelm@17112
   575
    val thy = theory_of state;
wenzelm@20913
   576
    val ctxt = context_of state;
wenzelm@11891
   577
wenzelm@20913
   578
    val (raw_name_atts, (raw_vars, raw_rhss)) = args |> split_list ||> split_list;
wenzelm@20913
   579
    val name_atts = map (apsnd (map (prep_att thy))) raw_name_atts;
wenzelm@11891
   580
  in
wenzelm@20913
   581
    state
wenzelm@20913
   582
    |> map_context_result (prep_vars (map (fn (x, mx) => (x, NONE, mx)) raw_vars))
wenzelm@20913
   583
    |>> map (fn (x, _, mx) => (x, mx))
wenzelm@20913
   584
    |-> (fn vars =>
wenzelm@20913
   585
      map_context_result (prep_binds false (map swap raw_rhss))
wenzelm@20913
   586
      #-> (fn rhss => map_context_result (LocalDefs.add_defs (vars ~~ (name_atts ~~ rhss)))))
wenzelm@20913
   587
    |-> (put_facts o SOME o map (#2 o #2))
wenzelm@11891
   588
  end;
wenzelm@11891
   589
wenzelm@16813
   590
in
wenzelm@16813
   591
wenzelm@20913
   592
val def = gen_def Attrib.attribute ProofContext.read_vars ProofContext.match_bind;
wenzelm@20913
   593
val def_i = gen_def (K I) ProofContext.cert_vars ProofContext.match_bind_i;
wenzelm@11891
   594
wenzelm@16813
   595
end;
wenzelm@16813
   596
wenzelm@11891
   597
wenzelm@8374
   598
wenzelm@17112
   599
(** facts **)
wenzelm@5820
   600
wenzelm@17359
   601
(* chain *)
wenzelm@5820
   602
wenzelm@24011
   603
fun clean_facts ctxt =
wenzelm@24050
   604
  put_facts (SOME (filter_out Thm.is_dummy (the_facts ctxt))) ctxt;
wenzelm@24011
   605
wenzelm@17359
   606
val chain =
wenzelm@17359
   607
  assert_forward
wenzelm@24011
   608
  #> clean_facts
wenzelm@17359
   609
  #> enter_chain;
wenzelm@5820
   610
wenzelm@17359
   611
fun chain_facts facts =
wenzelm@17359
   612
  put_facts (SOME facts)
wenzelm@17359
   613
  #> chain;
wenzelm@5820
   614
wenzelm@5820
   615
wenzelm@17359
   616
(* note etc. *)
wenzelm@17112
   617
wenzelm@28083
   618
fun no_binding args = map (pair (Name.no_binding, [])) args;
wenzelm@17112
   619
wenzelm@17112
   620
local
wenzelm@17112
   621
wenzelm@17359
   622
fun gen_thmss note_ctxt more_facts opt_chain opt_result prep_atts args state =
wenzelm@17112
   623
  state
wenzelm@17112
   624
  |> assert_forward
wenzelm@17112
   625
  |> map_context_result (note_ctxt (Attrib.map_facts (prep_atts (theory_of state)) args))
wenzelm@17112
   626
  |> these_factss (more_facts state)
wenzelm@17359
   627
  ||> opt_chain
wenzelm@17359
   628
  |> opt_result;
wenzelm@17112
   629
wenzelm@17112
   630
in
wenzelm@17112
   631
wenzelm@21442
   632
val note_thmss = gen_thmss (ProofContext.note_thmss "") (K []) I #2 Attrib.attribute;
wenzelm@21442
   633
val note_thmss_i = gen_thmss (ProofContext.note_thmss_i "") (K []) I #2 (K I);
wenzelm@17112
   634
wenzelm@17112
   635
val from_thmss =
wenzelm@21442
   636
  gen_thmss (ProofContext.note_thmss "") (K []) chain #2 Attrib.attribute o no_binding;
wenzelm@21442
   637
val from_thmss_i = gen_thmss (ProofContext.note_thmss_i "") (K []) chain #2 (K I) o no_binding;
wenzelm@17112
   638
wenzelm@17112
   639
val with_thmss =
wenzelm@21442
   640
  gen_thmss (ProofContext.note_thmss "") the_facts chain #2 Attrib.attribute o no_binding;
wenzelm@21442
   641
val with_thmss_i = gen_thmss (ProofContext.note_thmss_i "") the_facts chain #2 (K I) o no_binding;
wenzelm@17359
   642
wenzelm@18808
   643
val local_results =
wenzelm@21442
   644
  gen_thmss (ProofContext.note_thmss_i "") (K []) I I (K I) o map (apsnd Thm.simple_fact);
wenzelm@17359
   645
wenzelm@28083
   646
fun get_thmss state srcs = the_facts (note_thmss [((Name.no_binding, []), srcs)] state);
wenzelm@17112
   647
wenzelm@17112
   648
end;
wenzelm@17112
   649
wenzelm@17112
   650
wenzelm@18548
   651
(* using/unfolding *)
wenzelm@17112
   652
wenzelm@17112
   653
local
wenzelm@17112
   654
wenzelm@18548
   655
fun gen_using f g note prep_atts args state =
wenzelm@17112
   656
  state
wenzelm@17112
   657
  |> assert_backward
wenzelm@21442
   658
  |> map_context_result
wenzelm@21442
   659
    (note "" (Attrib.map_facts (prep_atts (theory_of state)) (no_binding args)))
wenzelm@18843
   660
  |> (fn (named_facts, state') =>
wenzelm@24556
   661
    state' |> map_goal I (fn (statement, _, using, goal, before_qed, after_qed) =>
wenzelm@18843
   662
      let
wenzelm@18843
   663
        val ctxt = context_of state';
wenzelm@19482
   664
        val ths = maps snd named_facts;
wenzelm@24556
   665
      in (statement, [], f ctxt ths using, g ctxt ths goal, before_qed, after_qed) end));
wenzelm@18548
   666
wenzelm@24050
   667
fun append_using _ ths using = using @ filter_out Thm.is_dummy ths;
wenzelm@18878
   668
fun unfold_using ctxt ths = map (LocalDefs.unfold ctxt ths);
wenzelm@18878
   669
val unfold_goals = LocalDefs.unfold_goals;
wenzelm@17112
   670
wenzelm@17112
   671
in
wenzelm@17112
   672
wenzelm@18843
   673
val using = gen_using append_using (K (K I)) ProofContext.note_thmss Attrib.attribute;
wenzelm@18843
   674
val using_i = gen_using append_using (K (K I)) ProofContext.note_thmss_i (K I);
wenzelm@18826
   675
val unfolding = gen_using unfold_using unfold_goals ProofContext.note_thmss Attrib.attribute;
wenzelm@18826
   676
val unfolding_i = gen_using unfold_using unfold_goals ProofContext.note_thmss_i (K I);
wenzelm@17112
   677
wenzelm@17112
   678
end;
wenzelm@17112
   679
wenzelm@17112
   680
wenzelm@17112
   681
(* case *)
wenzelm@17112
   682
wenzelm@17112
   683
local
wenzelm@17112
   684
wenzelm@17112
   685
fun gen_invoke_case prep_att (name, xs, raw_atts) state =
wenzelm@17112
   686
  let
wenzelm@17112
   687
    val atts = map (prep_att (theory_of state)) raw_atts;
wenzelm@19078
   688
    val (asms, state') = state |> map_context_result (fn ctxt =>
wenzelm@19078
   689
      ctxt |> ProofContext.apply_case (ProofContext.get_case ctxt name xs));
wenzelm@28083
   690
    val assumptions = asms |> map (fn (a, ts) => ((Name.binding a, atts), map (rpair []) ts));
wenzelm@17112
   691
  in
wenzelm@17112
   692
    state'
wenzelm@17359
   693
    |> map_context (ProofContext.qualified_names #> ProofContext.no_base_names)
wenzelm@17112
   694
    |> assume_i assumptions
wenzelm@17976
   695
    |> add_binds_i AutoBind.no_facts
wenzelm@17112
   696
    |> map_context (ProofContext.restore_naming (context_of state))
wenzelm@28083
   697
    |> `the_facts |-> (fn thms => note_thmss_i [((Name.binding name, []), [(thms, [])])])
wenzelm@17112
   698
  end;
wenzelm@17112
   699
wenzelm@17112
   700
in
wenzelm@17112
   701
wenzelm@18728
   702
val invoke_case = gen_invoke_case Attrib.attribute;
wenzelm@17112
   703
val invoke_case_i = gen_invoke_case (K I);
wenzelm@17112
   704
wenzelm@17112
   705
end;
wenzelm@17112
   706
wenzelm@17112
   707
wenzelm@17112
   708
wenzelm@17359
   709
(** proof structure **)
wenzelm@17359
   710
wenzelm@17359
   711
(* blocks *)
wenzelm@17359
   712
wenzelm@17359
   713
val begin_block =
wenzelm@17359
   714
  assert_forward
wenzelm@17359
   715
  #> open_block
wenzelm@17359
   716
  #> put_goal NONE
wenzelm@17359
   717
  #> open_block;
wenzelm@17359
   718
wenzelm@17359
   719
val next_block =
wenzelm@17359
   720
  assert_forward
wenzelm@17359
   721
  #> close_block
wenzelm@17359
   722
  #> open_block
wenzelm@17359
   723
  #> put_goal NONE
wenzelm@17359
   724
  #> put_facts NONE;
wenzelm@17359
   725
wenzelm@17359
   726
fun end_block state =
wenzelm@17359
   727
  state
wenzelm@17359
   728
  |> assert_forward
wenzelm@17359
   729
  |> close_block
wenzelm@17359
   730
  |> assert_current_goal false
wenzelm@17359
   731
  |> close_block
wenzelm@17359
   732
  |> export_facts state;
wenzelm@17359
   733
wenzelm@17359
   734
wenzelm@17359
   735
(* sub-proofs *)
wenzelm@17359
   736
wenzelm@17359
   737
fun proof opt_text =
wenzelm@17359
   738
  assert_backward
wenzelm@17859
   739
  #> refine (the_default Method.default_text opt_text)
wenzelm@17359
   740
  #> Seq.map (using_facts [] #> enter_forward);
wenzelm@17359
   741
wenzelm@23360
   742
fun end_proof bot txt state =
wenzelm@23360
   743
  state
wenzelm@23360
   744
  |> assert_forward
wenzelm@23360
   745
  |> assert_bottom bot
wenzelm@23360
   746
  |> close_block
wenzelm@23360
   747
  |> assert_current_goal true
wenzelm@23360
   748
  |> using_facts []
wenzelm@23360
   749
  |> `before_qed |-> (refine o the_default Method.succeed_text)
wenzelm@25958
   750
  |> Seq.maps (refine (Method.finish_text txt (Position.thread_data ())));
wenzelm@17359
   751
wenzelm@17359
   752
wenzelm@17359
   753
(* unstructured refinement *)
wenzelm@17359
   754
wenzelm@23360
   755
fun defer i = assert_no_chain #> refine (Method.Basic (K (Method.defer i), Position.none));
wenzelm@23360
   756
fun prefer i = assert_no_chain #> refine (Method.Basic (K (Method.prefer i), Position.none));
wenzelm@17359
   757
wenzelm@17359
   758
fun apply text = assert_backward #> refine text #> Seq.map (using_facts []);
wenzelm@17359
   759
fun apply_end text = assert_forward #> refine_end text;
wenzelm@17359
   760
wenzelm@17359
   761
wenzelm@17359
   762
wenzelm@17112
   763
(** goals **)
wenzelm@17112
   764
wenzelm@17359
   765
(* generic goals *)
wenzelm@17359
   766
wenzelm@19774
   767
local
wenzelm@19774
   768
wenzelm@19846
   769
fun implicit_vars dest add props =
wenzelm@19846
   770
  let
wenzelm@19846
   771
    val (explicit_vars, props') = take_prefix (can dest) props |>> map dest;
wenzelm@19846
   772
    val vars = rev (subtract (op =) explicit_vars (fold add props []));
wenzelm@19846
   773
    val _ =
wenzelm@19846
   774
      if null vars then ()
wenzelm@19846
   775
      else warning ("Goal statement contains unbound schematic variable(s): " ^
wenzelm@19846
   776
        commas_quote (map (Term.string_of_vname o fst) vars));
wenzelm@19846
   777
  in (rev vars, props') end;
wenzelm@19774
   778
wenzelm@19774
   779
fun refine_terms n =
wenzelm@19774
   780
  refine (Method.Basic (K (Method.RAW_METHOD
wenzelm@19774
   781
    (K (HEADGOAL (PRECISE_CONJUNCTS n
wenzelm@23360
   782
      (HEADGOAL (CONJUNCTS (ALLGOALS (rtac Drule.termI)))))))), Position.none))
wenzelm@19774
   783
  #> Seq.hd;
wenzelm@19774
   784
wenzelm@19774
   785
in
wenzelm@17359
   786
wenzelm@17859
   787
fun generic_goal prepp kind before_qed after_qed raw_propp state =
wenzelm@5820
   788
  let
wenzelm@17359
   789
    val thy = theory_of state;
wenzelm@23418
   790
    val cert = Thm.cterm_of thy;
wenzelm@17359
   791
    val chaining = can assert_chain state;
wenzelm@25958
   792
    val pos = Position.thread_data ();
wenzelm@17359
   793
wenzelm@17359
   794
    val ((propss, after_ctxt), goal_state) =
wenzelm@5936
   795
      state
wenzelm@5936
   796
      |> assert_forward_or_chain
wenzelm@5936
   797
      |> enter_forward
wenzelm@17359
   798
      |> open_block
wenzelm@17859
   799
      |> map_context_result (fn ctxt => swap (prepp (ctxt, raw_propp)));
wenzelm@19482
   800
    val props = flat propss;
wenzelm@15703
   801
wenzelm@19846
   802
    val (_, props') =
wenzelm@19846
   803
      implicit_vars (dest_TVar o Logic.dest_type o Logic.dest_term) Term.add_tvars props;
wenzelm@19846
   804
    val (vars, _) = implicit_vars (dest_Var o Logic.dest_term) Term.add_vars props';
wenzelm@19774
   805
wenzelm@19774
   806
    val propss' = map (Logic.mk_term o Var) vars :: propss;
wenzelm@23418
   807
    val goal_propss = filter_out null propss';
wenzelm@23418
   808
    val goal = Goal.init (cert
wenzelm@23418
   809
      (Logic.mk_conjunction_balanced (map Logic.mk_conjunction_balanced goal_propss)));
wenzelm@18124
   810
    val after_qed' = after_qed |>> (fn after_local =>
wenzelm@18124
   811
      fn results => map_context after_ctxt #> after_local results);
wenzelm@5820
   812
  in
wenzelm@17359
   813
    goal_state
wenzelm@21727
   814
    |> map_context (init_context #> Variable.set_body true)
wenzelm@25958
   815
    |> put_goal (SOME (make_goal (((kind, pos), propss'), [], [], goal, before_qed, after_qed')))
wenzelm@17359
   816
    |> map_context (ProofContext.auto_bind_goal props)
wenzelm@21565
   817
    |> chaining ? (`the_facts #-> using_facts)
wenzelm@17359
   818
    |> put_facts NONE
wenzelm@17359
   819
    |> open_block
wenzelm@17359
   820
    |> put_goal NONE
wenzelm@5820
   821
    |> enter_backward
wenzelm@23418
   822
    |> not (null vars) ? refine_terms (length goal_propss)
wenzelm@23360
   823
    |> null props ? (refine (Method.Basic (Method.assumption, Position.none)) #> Seq.hd)
wenzelm@5820
   824
  end;
wenzelm@5820
   825
wenzelm@17359
   826
fun generic_qed state =
wenzelm@12503
   827
  let
wenzelm@25958
   828
    val (goal_ctxt, {statement, goal, after_qed, ...}) = current_goal state;
wenzelm@8617
   829
    val outer_state = state |> close_block;
wenzelm@8617
   830
    val outer_ctxt = context_of outer_state;
wenzelm@8617
   831
wenzelm@25958
   832
    val ((_, pos), stmt) = statement;
wenzelm@18503
   833
    val props =
wenzelm@19774
   834
      flat (tl stmt)
wenzelm@19915
   835
      |> Variable.exportT_terms goal_ctxt outer_ctxt;
wenzelm@17359
   836
    val results =
wenzelm@19774
   837
      tl (conclude_goal state goal stmt)
wenzelm@20309
   838
      |> burrow (ProofContext.export goal_ctxt outer_ctxt);
wenzelm@25958
   839
wenzelm@25958
   840
    val (after_local, after_global) = after_qed;
wenzelm@25958
   841
    fun after_local' x y = Position.setmp_thread_data_seq pos (fn () => after_local x y) ();
wenzelm@25958
   842
    fun after_global' x y = Position.setmp_thread_data pos (fn () => after_global x y) ();
wenzelm@17359
   843
  in
wenzelm@17359
   844
    outer_state
wenzelm@17359
   845
    |> map_context (ProofContext.auto_bind_facts props)
wenzelm@25958
   846
    |> pair ((after_local', after_global'), results)
wenzelm@17359
   847
  end;
wenzelm@17359
   848
wenzelm@19774
   849
end;
wenzelm@19774
   850
wenzelm@9469
   851
wenzelm@17359
   852
(* local goals *)
wenzelm@17359
   853
wenzelm@17859
   854
fun local_goal print_results prep_att prepp kind before_qed after_qed stmt state =
wenzelm@17359
   855
  let
wenzelm@21362
   856
    val thy = theory_of state;
wenzelm@21362
   857
    val ((names, attss), propp) =
wenzelm@21362
   858
      Attrib.map_specs (prep_att thy) stmt |> split_list |>> split_list;
wenzelm@17359
   859
wenzelm@18124
   860
    fun after_qed' results =
wenzelm@18808
   861
      local_results ((names ~~ attss) ~~ results)
wenzelm@17359
   862
      #-> (fn res => tap (fn st => print_results (context_of st) ((kind, ""), res) : unit))
wenzelm@18124
   863
      #> after_qed results;
wenzelm@5820
   864
  in
wenzelm@17359
   865
    state
wenzelm@21362
   866
    |> generic_goal prepp kind before_qed (after_qed', K I) propp
wenzelm@19900
   867
    |> tap (Variable.warn_extra_tfrees (context_of state) o context_of)
wenzelm@5820
   868
  end;
wenzelm@5820
   869
wenzelm@17359
   870
fun local_qed txt =
wenzelm@20309
   871
  end_proof false txt #>
wenzelm@20309
   872
  Seq.maps (generic_qed #-> (fn ((after_qed, _), results) => after_qed results));
wenzelm@5820
   873
wenzelm@5820
   874
wenzelm@17359
   875
(* global goals *)
wenzelm@17359
   876
wenzelm@21442
   877
fun global_goal prepp before_qed after_qed propp ctxt =
wenzelm@21362
   878
  init ctxt
wenzelm@21442
   879
  |> generic_goal (prepp #> ProofContext.auto_fixes) ""
wenzelm@21362
   880
    before_qed (K Seq.single, after_qed) propp;
wenzelm@17359
   881
wenzelm@21362
   882
val theorem = global_goal ProofContext.bind_propp_schematic;
wenzelm@21362
   883
val theorem_i = global_goal ProofContext.bind_propp_schematic_i;
wenzelm@12065
   884
wenzelm@18678
   885
fun check_result msg sq =
wenzelm@17112
   886
  (case Seq.pull sq of
wenzelm@18678
   887
    NONE => error msg
wenzelm@19475
   888
  | SOME (s', sq') => Seq.cons s' sq');
wenzelm@17112
   889
wenzelm@17359
   890
fun global_qeds txt =
wenzelm@17359
   891
  end_proof true txt
wenzelm@20309
   892
  #> Seq.map (generic_qed #> (fn (((_, after_qed), results), state) =>
wenzelm@20363
   893
    after_qed results (context_of state)))
wenzelm@17112
   894
  |> Seq.DETERM;   (*backtracking may destroy theory!*)
wenzelm@17112
   895
wenzelm@18678
   896
fun global_qed txt =
wenzelm@18678
   897
  global_qeds txt
wenzelm@18678
   898
  #> check_result "Failed to finish proof"
wenzelm@18678
   899
  #> Seq.hd;
wenzelm@12959
   900
wenzelm@5820
   901
wenzelm@17359
   902
(* concluding steps *)
wenzelm@17112
   903
wenzelm@17359
   904
fun local_terminal_proof (text, opt_text) =
wenzelm@17359
   905
  proof (SOME text) #> Seq.maps (local_qed (opt_text, true));
wenzelm@17112
   906
wenzelm@17112
   907
val local_default_proof = local_terminal_proof (Method.default_text, NONE);
wenzelm@17112
   908
val local_immediate_proof = local_terminal_proof (Method.this_text, NONE);
wenzelm@17359
   909
val local_done_proof = proof (SOME Method.done_text) #> Seq.maps (local_qed (NONE, false));
wenzelm@17359
   910
fun local_skip_proof int = local_terminal_proof (Method.sorry_text int, NONE);
wenzelm@17112
   911
wenzelm@18678
   912
fun global_term_proof immed (text, opt_text) =
wenzelm@18678
   913
  proof (SOME text)
wenzelm@18678
   914
  #> check_result "Terminal proof method failed"
wenzelm@18678
   915
  #> Seq.maps (global_qeds (opt_text, immed))
wenzelm@18678
   916
  #> check_result "Failed to finish proof (after successful terminal method)"
wenzelm@18678
   917
  #> Seq.hd;
wenzelm@17112
   918
wenzelm@17112
   919
val global_terminal_proof = global_term_proof true;
wenzelm@17112
   920
val global_default_proof = global_terminal_proof (Method.default_text, NONE);
wenzelm@17112
   921
val global_immediate_proof = global_terminal_proof (Method.this_text, NONE);
wenzelm@17112
   922
val global_done_proof = global_term_proof false (Method.done_text, NONE);
wenzelm@17359
   923
fun global_skip_proof int = global_terminal_proof (Method.sorry_text int, NONE);
wenzelm@5820
   924
wenzelm@6896
   925
wenzelm@17359
   926
(* common goal statements *)
wenzelm@17359
   927
wenzelm@17359
   928
local
wenzelm@17359
   929
wenzelm@17859
   930
fun gen_have prep_att prepp before_qed after_qed stmt int =
wenzelm@17859
   931
  local_goal (ProofDisplay.print_results int) prep_att prepp "have" before_qed after_qed stmt;
wenzelm@6896
   932
wenzelm@17859
   933
fun gen_show prep_att prepp before_qed after_qed stmt int state =
wenzelm@17359
   934
  let
wenzelm@17359
   935
    val testing = ref false;
wenzelm@17359
   936
    val rule = ref (NONE: thm option);
wenzelm@17359
   937
    fun fail_msg ctxt =
wenzelm@17359
   938
      "Local statement will fail to solve any pending goal" ::
wenzelm@17359
   939
      (case ! rule of NONE => [] | SOME th => [ProofDisplay.string_of_rule ctxt "Failed" th])
wenzelm@17359
   940
      |> cat_lines;
wenzelm@6896
   941
wenzelm@17359
   942
    fun print_results ctxt res =
wenzelm@17359
   943
      if ! testing then () else ProofDisplay.print_results int ctxt res;
wenzelm@17359
   944
    fun print_rule ctxt th =
wenzelm@17359
   945
      if ! testing then rule := SOME th
wenzelm@17359
   946
      else if int then priority (ProofDisplay.string_of_rule ctxt "Successful" th)
wenzelm@17359
   947
      else ();
wenzelm@17359
   948
    val test_proof =
wenzelm@17359
   949
      (Seq.pull oo local_skip_proof) true
wenzelm@28289
   950
      |> setmp_noncritical testing true
wenzelm@23963
   951
      |> Exn.capture;
wenzelm@6896
   952
wenzelm@18124
   953
    fun after_qed' results =
wenzelm@19482
   954
      refine_goals print_rule (context_of state) (flat results)
wenzelm@18124
   955
      #> Seq.maps (after_qed results);
wenzelm@17359
   956
  in
wenzelm@17359
   957
    state
wenzelm@17859
   958
    |> local_goal print_results prep_att prepp "show" before_qed after_qed' stmt
wenzelm@21565
   959
    |> int ? (fn goal_state =>
wenzelm@17359
   960
      (case test_proof goal_state of
wenzelm@23963
   961
        Exn.Result (SOME _) => goal_state
wenzelm@23963
   962
      | Exn.Result NONE => error (fail_msg (context_of goal_state))
wenzelm@23963
   963
      | Exn.Exn Interrupt => raise Interrupt
wenzelm@23963
   964
      | Exn.Exn exn => raise Exn.EXCEPTIONS ([exn], fail_msg (context_of goal_state))))
wenzelm@17359
   965
  end;
wenzelm@17359
   966
wenzelm@17359
   967
in
wenzelm@17359
   968
wenzelm@18728
   969
val have = gen_have Attrib.attribute ProofContext.bind_propp;
wenzelm@17359
   970
val have_i = gen_have (K I) ProofContext.bind_propp_i;
wenzelm@18728
   971
val show = gen_show Attrib.attribute ProofContext.bind_propp;
wenzelm@17359
   972
val show_i = gen_show (K I) ProofContext.bind_propp_i;
wenzelm@6896
   973
wenzelm@5820
   974
end;
wenzelm@17359
   975
wenzelm@17359
   976
end;