src/Pure/PIDE/command.ML
author wenzelm
Wed, 03 Jul 2013 16:19:57 +0200
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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_result: 'a memo -> 'a
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  val eval: span -> Toplevel.transition ->
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    Toplevel.state * {malformed: bool} -> {failed: bool} * (Toplevel.state * {malformed: bool})
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  val no_print: unit lazy
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  val print: Toplevel.transition -> Toplevel.state -> unit lazy
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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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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_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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end;
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(* side-comments *)
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local
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fun cmts (t1 :: t2 :: toks) =
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      if Token.keyword_with (fn s => s = "--") t1 then t2 :: cmts toks
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      else cmts (t2 :: toks)
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  | cmts _ = [];
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val span_cmts = filter Token.is_proper #> cmts;
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in
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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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      span_cmts 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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end;
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(* 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 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 (st, {malformed}) =
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  if malformed then
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    ({failed = true}, (Toplevel.toplevel, {malformed = malformed}))
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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}, (st, {malformed = malformed'})) 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}, (st', {malformed = malformed'})) end)
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    end;
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end;
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(* print *)
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val no_print = Lazy.value ();
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fun print tr st' =
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  let
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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 do_print =
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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
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    if do_print then
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      (Lazy.lazy o Toplevel.setmp_thread_position tr)
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        (fn () => Toplevel.print_state false st')
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    else no_print
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  end;
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end;
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