wenzelm@48240
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(* Title: Pure/PIDE/command.ML
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Author: Makarius
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Prover command execution.
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*)
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signature COMMAND =
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sig
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type span = Token.T list
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val range: span -> Position.range
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val proper_range: span -> Position.range
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type 'a memo
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val memo: (unit -> 'a) -> 'a memo
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val memo_value: 'a -> 'a memo
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val memo_eval: 'a memo -> 'a
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val memo_fork: Future.params -> 'a memo -> unit
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val memo_result: 'a memo -> 'a
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val memo_stable: 'a memo -> bool
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val read: span -> Toplevel.transition
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type eval_state =
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{failed: bool, malformed: bool, command: Toplevel.transition, state: Toplevel.state}
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type eval = {exec_id: Document_ID.exec, eval: eval_state memo}
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val no_eval: eval
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val eval_result: eval -> eval_state
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val eval: span -> Toplevel.transition -> eval_state -> eval_state
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type print_fn = Toplevel.transition -> Toplevel.state -> unit
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type print = {name: string, pri: int, exec_id: Document_ID.exec, print: unit memo}
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val print: string -> eval -> print list
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val print_function: {name: string, pri: int} -> (string -> print_fn option) -> unit
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type exec = eval * print list
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val no_exec: exec
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val exec_ids: exec -> Document_ID.exec list
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val exec_result: exec -> eval_state
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val exec_run: exec -> unit
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val stable_eval: eval -> bool
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val stable_print: print -> bool
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end;
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structure Command: COMMAND =
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struct
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(* source *)
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type span = Token.T list;
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val range = Token.position_range_of;
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wenzelm@52403
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val proper_range = Token.position_range_of o #1 o take_suffix Token.is_improper;
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(* memo results *)
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datatype 'a expr =
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Expr of unit -> 'a |
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Result of 'a Exn.result;
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abstype 'a memo = Memo of 'a expr Synchronized.var
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with
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fun memo e = Memo (Synchronized.var "Command.memo" (Expr e));
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fun memo_value a = Memo (Synchronized.var "Command.memo" (Result (Exn.Res a)));
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fun memo_eval (Memo v) =
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(case Synchronized.value v of
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Result res => res
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| _ =>
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Synchronized.guarded_access v
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(fn Result res => SOME (res, Result res)
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| Expr e =>
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let val res = Exn.capture e (); (*memoing of physical interrupts!*)
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in SOME (res, Result res) end))
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|> Exn.release;
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fun memo_fork params (Memo v) =
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(case Synchronized.value v of
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Result _ => ()
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| _ => ignore ((singleton o Future.forks) params (fn () => memo_eval (Memo v))));
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fun memo_result (Memo v) =
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(case Synchronized.value v of
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Result res => Exn.release res
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| _ => raise Fail "Unfinished memo result");
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fun memo_stable (Memo v) =
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(case Synchronized.value v of
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Expr _ => true
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| Result res => not (Exn.is_interrupt_exn res));
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end;
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(** main phases: read -- eval -- print **)
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(* read *)
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fun read span =
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let
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val outer_syntax = #2 (Outer_Syntax.get_syntax ());
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val command_reports = Outer_Syntax.command_reports outer_syntax;
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val proper_range = Position.set_range (proper_range span);
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val pos =
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(case find_first Token.is_command span of
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SOME tok => Token.position_of tok
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| NONE => proper_range);
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val (is_malformed, token_reports) = Thy_Syntax.reports_of_tokens span;
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val _ = Position.reports_text (token_reports @ maps command_reports span);
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in
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if is_malformed then Toplevel.malformed pos "Malformed command syntax"
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else
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(case Outer_Syntax.read_spans outer_syntax span of
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[tr] =>
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if Keyword.is_control (Toplevel.name_of tr) then
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Toplevel.malformed pos "Illegal control command"
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else tr
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| [] => Toplevel.ignored (Position.set_range (range span))
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| _ => Toplevel.malformed proper_range "Exactly one command expected")
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handle ERROR msg => Toplevel.malformed proper_range msg
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end;
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(* eval *)
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type eval_state =
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{failed: bool, malformed: bool, command: Toplevel.transition, state: Toplevel.state};
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val no_eval_state: eval_state =
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{failed = false, malformed = false, command = Toplevel.empty, state = Toplevel.toplevel};
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type eval = {exec_id: Document_ID.exec, eval: eval_state memo};
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val no_eval: eval = {exec_id = Document_ID.none, eval = memo_value no_eval_state};
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fun eval_result ({eval, ...}: eval) = memo_result eval;
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local
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fun run int tr st =
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if Goal.future_enabled () andalso Keyword.is_diag (Toplevel.name_of tr) then
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(Goal.fork_params {name = "Toplevel.diag", pos = Toplevel.pos_of tr, pri = ~1}
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(fn () => Toplevel.command_exception int tr st); ([], SOME st))
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else Toplevel.command_errors int tr st;
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fun check_cmts span tr st' =
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Toplevel.setmp_thread_position tr
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(fn () =>
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Outer_Syntax.side_comments span |> maps (fn cmt =>
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(Thy_Output.check_text (Token.source_position_of cmt) st'; [])
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handle exn => ML_Compiler.exn_messages_ids exn)) ();
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fun proof_status tr st =
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(case try Toplevel.proof_of st of
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SOME prf => Toplevel.status tr (Proof.status_markup prf)
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| NONE => ());
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in
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fun eval span tr ({malformed, state = st, ...}: eval_state) =
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if malformed then
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{failed = true, malformed = malformed, command = tr, state = Toplevel.toplevel}
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else
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let
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val malformed' = Toplevel.is_malformed tr;
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val is_init = Toplevel.is_init tr;
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val is_proof = Keyword.is_proof (Toplevel.name_of tr);
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val _ = Multithreading.interrupted ();
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val _ = Toplevel.status tr Markup.running;
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val (errs1, result) = run (is_init orelse is_proof) (Toplevel.set_print false tr) st;
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val errs2 = (case result of NONE => [] | SOME st' => check_cmts span tr st');
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val errs = errs1 @ errs2;
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val _ = Toplevel.status tr Markup.finished;
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val _ = List.app (Future.error_msg (Toplevel.pos_of tr)) errs;
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in
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(case result of
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NONE =>
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let
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val _ = if null errs then Exn.interrupt () else ();
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val _ = Toplevel.status tr Markup.failed;
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in {failed = true, malformed = malformed', command = tr, state = st} end
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| SOME st' =>
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let
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val _ = proof_status tr st';
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in {failed = false, malformed = malformed', command = tr, state = st'} end)
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end;
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end;
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(* print *)
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type print = {name: string, pri: int, exec_id: Document_ID.exec, print: unit memo};
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type print_fn = Toplevel.transition -> Toplevel.state -> unit;
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local
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type print_function = string * (int * (string -> print_fn option));
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val print_functions = Synchronized.var "Command.print_functions" ([]: print_function list);
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fun output_error tr exn =
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List.app (Future.error_msg (Toplevel.pos_of tr)) (ML_Compiler.exn_messages_ids exn);
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fun print_error tr f x =
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(Toplevel.setmp_thread_position tr o Runtime.controlled_execution) f x
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handle exn => output_error tr exn;
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in
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fun print command_name eval =
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rev (Synchronized.value print_functions) |> map_filter (fn (name, (pri, get_print_fn)) =>
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(case Exn.capture (Runtime.controlled_execution get_print_fn) command_name of
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Exn.Res NONE => NONE
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| Exn.Res (SOME print_fn) =>
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let
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val exec_id = Document_ID.make ();
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fun body () =
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let
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val {failed, command, state = st', ...} = eval_result eval;
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val tr = Toplevel.put_id exec_id command;
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in if failed then () else print_error tr (fn () => print_fn tr st') () end;
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in SOME {name = name, pri = pri, exec_id = exec_id, print = memo body} end
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| Exn.Exn exn =>
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let
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val exec_id = Document_ID.make ();
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fun body () =
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let
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val {command, ...} = eval_result eval;
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val tr = Toplevel.put_id exec_id command;
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in output_error tr exn end;
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in SOME {name = name, pri = pri, exec_id = exec_id, print = memo body} end));
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fun print_function {name, pri} f =
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Synchronized.change print_functions (fn funs =>
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(if not (AList.defined (op =) funs name) then ()
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else warning ("Redefining command print function: " ^ quote name);
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AList.update (op =) (name, (pri, f)) funs));
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end;
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val _ =
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print_function {name = "print_state", pri = 0} (fn command_name => SOME (fn tr => fn st' =>
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let
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val is_init = Keyword.is_theory_begin command_name;
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wenzelm@53663
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val is_proof = Keyword.is_proof command_name;
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wenzelm@53663
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val do_print =
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wenzelm@53663
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not is_init andalso
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(Toplevel.print_of tr orelse (is_proof andalso Toplevel.is_proof st'));
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in if do_print then Toplevel.print_state false st' else () end));
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(** managed evaluation **)
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(* execution *)
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type exec = eval * print list;
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val no_exec: exec = (no_eval, []);
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fun exec_ids (({exec_id, ...}, prints): exec) = exec_id :: map #exec_id prints;
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fun exec_result (({eval, ...}, _): exec) = memo_result eval;
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fun exec_run (({eval, ...}, prints): exec) =
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(memo_eval eval;
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prints |> List.app (fn {name, pri, print, ...} =>
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wenzelm@53669
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memo_fork {name = name, group = NONE, deps = [], pri = pri, interrupts = true} print));
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(* stable situations after cancellation *)
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fun stable_goals exec_id =
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wenzelm@53669
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not (Par_Exn.is_interrupted (Future.join_results (Goal.peek_futures exec_id)));
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fun stable_eval ({exec_id, eval}: eval) =
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stable_goals exec_id andalso memo_stable eval;
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fun stable_print ({exec_id, print, ...}: print) =
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stable_goals exec_id andalso memo_stable print;
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end;
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