src/Pure/Isar/toplevel.ML
author wenzelm
Sat Jan 14 17:14:18 2006 +0100 (2006-01-14 ago)
changeset 18685 725660906cb3
parent 18664 ad7ae7870427
child 18718 d01837224eaf
permissions -rw-r--r--
sane ERROR vs. TOPLEVEL_ERROR handling;
added program;
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(*  Title:      Pure/Isar/toplevel.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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The Isabelle/Isar toplevel.
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*)
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signature TOPLEVEL =
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sig
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  type node
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  val theory_node: node -> theory option
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  val proof_node: node -> ProofHistory.T option
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  type state
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  val toplevel: state
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  val is_toplevel: state -> bool
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  val is_theory: state -> bool
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  val is_proof: state -> bool
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  val level: state -> int
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  exception UNDEF
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  val assert: bool -> unit
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  val node_history_of: state -> node History.T
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  val node_of: state -> node
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  val node_case: (theory -> 'a) -> (Proof.state -> 'a) -> state -> 'a
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  val context_of: state -> Context.generic
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  val theory_of: state -> theory
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  val body_context_of: state -> Proof.context
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  val proof_of: state -> Proof.state
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  val proof_position_of: state -> int
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  val enter_forward_proof: state -> Proof.state
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  val prompt_state_default: state -> string
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  val prompt_state_fn: (state -> string) ref
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  val print_state_context: state -> unit
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  val print_state_default: bool -> state -> unit
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  val print_state_hook: (bool -> state -> unit) -> unit
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  val print_state_fn: (bool -> state -> unit) ref
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  val print_state: bool -> state -> unit
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  val pretty_state: bool -> state -> Pretty.T list
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  val quiet: bool ref
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  val debug: bool ref
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  val interact: bool ref
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  val timing: bool ref
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  val profiling: int ref
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  val skip_proofs: bool ref
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  exception TERMINATE
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  exception RESTART
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  val no_body_context: state -> state
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  val checkpoint: state -> state
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  val copy: state -> state
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  type transition
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  val undo_limit: bool -> int option
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  val empty: transition
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  val name_of: transition -> string
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  val source_of: transition -> OuterLex.token list option
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  val name: string -> transition -> transition
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  val position: Position.T -> transition -> transition
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  val source: OuterLex.token list -> transition -> transition
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  val interactive: bool -> transition -> transition
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  val print: transition -> transition
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  val print': string -> transition -> transition
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  val three_buffersN: string
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  val print3: transition -> transition
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  val no_timing: transition -> transition
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  val reset: transition -> transition
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  val init: (bool -> node) -> (node -> unit) -> (node -> unit) -> transition -> transition
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  val exit: transition -> transition
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  val kill: transition -> transition
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  val keep: (state -> unit) -> transition -> transition
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  val keep': (bool -> state -> unit) -> transition -> transition
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  val history: (node History.T -> node History.T) -> transition -> transition
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  val imperative: (unit -> unit) -> transition -> transition
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  val init_theory: (bool -> theory) -> (theory -> unit) -> (theory -> unit)
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    -> transition -> transition
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  val theory: (theory -> theory) -> transition -> transition
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  val theory': (bool -> theory -> theory) -> transition -> transition
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  val theory_context: (theory -> theory * Proof.context) -> transition -> transition
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  val theory_to_proof: (theory -> Proof.state) -> transition -> transition
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  val proof: (Proof.state -> Proof.state) -> transition -> transition
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  val proofs: (Proof.state -> Proof.state Seq.seq) -> transition -> transition
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  val proof': (bool -> Proof.state -> Proof.state) -> transition -> transition
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  val proofs': (bool -> Proof.state -> Proof.state Seq.seq) -> transition -> transition
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  val actual_proof: (ProofHistory.T -> ProofHistory.T) -> transition -> transition
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  val skip_proof: (int History.T -> int History.T) -> transition -> transition
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  val proof_to_theory: (Proof.state -> theory) -> transition -> transition
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  val proof_to_theory': (bool -> Proof.state -> theory) -> transition -> transition
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  val proof_to_theory_context: (bool -> Proof.state -> theory * Proof.context)
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    -> transition -> transition
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  val skip_proof_to_theory: (int -> bool) -> transition -> transition
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  val forget_proof: transition -> transition
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  val unknown_theory: transition -> transition
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  val unknown_proof: transition -> transition
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  val unknown_context: transition -> transition
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  val exn_message: exn -> string
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  val apply: bool -> transition -> state -> (state * (exn * string) option) option
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  val command: transition -> state -> state
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  val present_excursion: (transition * (state -> state -> 'a -> 'a)) list -> 'a -> 'a
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  val excursion: transition list -> unit
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  val program: (unit -> 'a) -> 'a
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  val set_state: state -> unit
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  val get_state: unit -> state
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  val exn: unit -> (exn * string) option
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  val >> : transition -> bool
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  val >>> : transition list -> unit
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  type 'a isar
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  val loop: 'a isar -> unit
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end;
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structure Toplevel: TOPLEVEL =
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struct
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(** toplevel state **)
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(* datatype state *)
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datatype node =
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  Theory of theory * Proof.context option |        (*theory with optional body context*)
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  Proof of ProofHistory.T * theory |               (*history of proof states, original theory*)
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  SkipProof of (int History.T * theory) * theory;
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    (*history of proof depths, resulting theory, original theory*)
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val theory_node = fn Theory (thy, _) => SOME thy | _ => NONE;
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val proof_node = fn Proof (prf, _) => SOME prf | _ => NONE;
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datatype state = State of (node History.T * ((node -> unit) * (node -> unit))) option;
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val toplevel = State NONE;
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fun is_toplevel (State NONE) = true
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  | is_toplevel _ = false;
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fun level (State NONE) = 0
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  | level (State (SOME (node, _))) =
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      (case History.current node of
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        Theory _ => 0
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      | Proof (prf, _) => Proof.level (ProofHistory.current prf)
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      | SkipProof ((h, _), _) => History.current h + 1);    (*different notion of proof depth!*)
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fun str_of_state (State NONE) = "at top level"
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  | str_of_state (State (SOME (node, _))) =
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      (case History.current node of
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        Theory _ => "in theory mode"
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      | Proof _ => "in proof mode"
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      | SkipProof _ => "in skipped proof mode");
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(* top node *)
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exception UNDEF;
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fun assert true = ()
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  | assert false = raise UNDEF;
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fun node_history_of (State NONE) = raise UNDEF
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  | node_history_of (State (SOME (node, _))) = node;
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val node_of = History.current o node_history_of;
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fun is_theory state = not (is_toplevel state) andalso is_some (theory_node (node_of state));
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fun is_proof state = not (is_toplevel state) andalso is_some (proof_node (node_of state));
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fun node_case f g state =
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  (case node_of state of
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    Theory (thy, _) => f thy
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  | Proof (prf, _) => g (ProofHistory.current prf)
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  | SkipProof ((_, thy), _) => f thy);
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val context_of = node_case Context.Theory (Context.Proof o Proof.context_of);
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val theory_of = node_case I Proof.theory_of;
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fun body_context_of state =
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  (case node_of state of
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    Theory (_, SOME ctxt) => ctxt
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  | _ => node_case ProofContext.init Proof.context_of state);
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val proof_of = node_case (fn _ => raise UNDEF) I;
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fun proof_position_of state =
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  (case node_of state of
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    Proof (prf, _) => ProofHistory.position prf
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  | _ => raise UNDEF);
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val enter_forward_proof = node_case (Proof.init o ProofContext.init) Proof.enter_forward;
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(* prompt state *)
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fun prompt_state_default (State _) = Source.default_prompt;
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val prompt_state_fn = ref prompt_state_default;
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fun prompt_state state = ! prompt_state_fn state;
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(* print state *)
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fun pretty_context thy = [Pretty.block
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  [Pretty.str "theory", Pretty.brk 1, Pretty.str (Context.theory_name thy),
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    Pretty.str " =", Pretty.brk 1, ThyInfo.pretty_theory thy]];
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fun pretty_state_context state =
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  (case try theory_of state of NONE => []
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  | SOME thy => pretty_context thy);
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fun pretty_node prf_only (Theory (thy, _)) = if prf_only then [] else pretty_context thy
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  | pretty_node _ (Proof (prf, _)) =
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      Proof.pretty_state (ProofHistory.position prf) (ProofHistory.current prf)
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  | pretty_node _ (SkipProof ((h, _), _)) =
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      [Pretty.str ("skipped proof: depth " ^ string_of_int (History.current h))];
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fun pretty_state prf_only state =
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  let val ref (begin_state, end_state, _) = Display.current_goals_markers in
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    (case try node_of state of NONE => []
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    | SOME node =>
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        (if begin_state = "" then [] else [Pretty.str begin_state]) @
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        pretty_node prf_only node @
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        (if end_state = "" then [] else [Pretty.str end_state]))
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  end;
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val print_state_context = Pretty.writelns o pretty_state_context;
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fun print_state_default prf_only state = Pretty.writelns (pretty_state prf_only state);
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val print_state_hooks = ref ([]: (bool -> state -> unit) list);
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fun print_state_hook f = change print_state_hooks (cons f);
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val print_state_fn = ref print_state_default;
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fun print_state prf_only state =
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 (List.app (fn f => (try (fn () => f prf_only state) (); ())) (! print_state_hooks);
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  ! print_state_fn prf_only state);
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(** toplevel transitions **)
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val quiet = ref false;
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val debug = ref false;
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val interact = ref false;
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val timing = Output.timing;
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val profiling = ref 0;
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val skip_proofs = ref false;
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exception TERMINATE;
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exception RESTART;
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exception EXCURSION_FAIL of exn * string;
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exception FAILURE of state * exn;
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fun debugging f x =
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  if ! debug then
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    setmp Library.do_transform_failure false
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      exception_trace (fn () => f x)
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  else f x;
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(* node transactions and recovery from stale theories *)
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(*NB: proof commands should be non-destructive!*)
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local
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fun is_stale state = Context.is_stale (theory_of state) handle UNDEF => false;
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val stale_theory = ERROR "Stale theory encountered after succesful execution!";
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fun checkpoint_node (Theory (thy, ctxt)) = Theory (Theory.checkpoint thy, ctxt)
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  | checkpoint_node node = node;
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fun copy_node (Theory (thy, ctxt)) = Theory (Theory.copy thy, ctxt)
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  | copy_node node = node;
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fun return (result, NONE) = result
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  | return (result, SOME exn) = raise FAILURE (result, exn);
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fun interruptible f x =
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  let val y = ref x
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  in raise_interrupt (fn () => y := f x) (); ! y end;
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in
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fun transaction _ _ (State NONE) = raise UNDEF
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  | transaction hist f (State (SOME (node, term))) =
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      let
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        val cont_node = History.map checkpoint_node node;
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        val back_node = History.map copy_node cont_node;
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        fun state nd = State (SOME (nd, term));
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        fun normal_state nd = (state nd, NONE);
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        fun error_state nd exn = (state nd, SOME exn);
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        val (result, err) =
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          cont_node
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          |> (f
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              |> (if hist then History.apply_copy copy_node else History.map)
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              |> debugging
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              |> interruptible
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              |> setmp Output.do_toplevel_errors false)
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          |> normal_state
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          handle exn => error_state cont_node exn;
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      in
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        if is_stale result
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        then return (error_state back_node (if_none err stale_theory))
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        else return (result, err)
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      end;
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fun mapping f (State (SOME (node, term))) = State (SOME (History.map f node, term))
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  | mapping _ state = state;
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val no_body_context = mapping (fn Theory (thy, _) => Theory (thy, NONE) | node => node);
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val checkpoint = mapping checkpoint_node;
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val copy = mapping copy_node;
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end;
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(* primitive transitions *)
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(*Note: Recovery from stale theories is provided only for theory-level
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  operations via Transaction.  Other node or state operations should
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  not touch theories at all.  Interrupts are enabled only for Keep and
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  Transaction.*)
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datatype trans =
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  Reset |                                               (*empty toplevel*)
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  Init of (bool -> node) * ((node -> unit) * (node -> unit)) |
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                                                        (*init node; with exit/kill operation*)
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  Exit |                                                (*conclude node*)
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  Kill |                                                (*abort node*)
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  Keep of bool -> state -> unit |                       (*peek at state*)
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  History of node History.T -> node History.T |         (*history operation (undo etc.)*)
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  Transaction of bool * (bool -> node -> node);         (*node transaction*)
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fun undo_limit int = if int then NONE else SOME 0;
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local
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fun apply_tr _ Reset _ = toplevel
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  | apply_tr int (Init (f, term)) (State NONE) =
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      State (SOME (History.init (undo_limit int) (f int), term))
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  | apply_tr _ (Init _ ) (State (SOME _)) = raise UNDEF
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  | apply_tr _ Exit (State NONE) = raise UNDEF
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  | apply_tr _ Exit (State (SOME (node, (exit, _)))) =
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      (exit (History.current node); State NONE)
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  | apply_tr _ Kill (State NONE) = raise UNDEF
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  | apply_tr _ Kill (State (SOME (node, (_, kill)))) =
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      (kill (History.current node); State NONE)
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  | apply_tr int (Keep f) state = (raise_interrupt (f int) state; state)
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  | apply_tr _ (History _) (State NONE) = raise UNDEF
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  | apply_tr _ (History f) (State (SOME (node, term))) = State (SOME (f node, term))
wenzelm@18592
   345
  | apply_tr int (Transaction (hist, f)) state = transaction hist (fn x => f int x) state;
wenzelm@5828
   346
wenzelm@6689
   347
fun apply_union _ [] state = raise FAILURE (state, UNDEF)
wenzelm@6689
   348
  | apply_union int (tr :: trs) state =
wenzelm@18685
   349
      apply_tr int tr state
wenzelm@6689
   350
        handle UNDEF => apply_union int trs state
wenzelm@6689
   351
          | FAILURE (alt_state, UNDEF) => apply_union int trs alt_state
wenzelm@6689
   352
          | exn as FAILURE _ => raise exn
wenzelm@6689
   353
          | exn => raise FAILURE (state, exn);
wenzelm@6689
   354
wenzelm@6689
   355
in
wenzelm@6689
   356
skalberg@15531
   357
fun apply_trans int trs state = (apply_union int trs state, NONE)
skalberg@15531
   358
  handle FAILURE (alt_state, exn) => (alt_state, SOME exn) | exn => (state, SOME exn);
wenzelm@6689
   359
wenzelm@6689
   360
end;
wenzelm@5828
   361
wenzelm@5828
   362
wenzelm@5828
   363
(* datatype transition *)
wenzelm@5828
   364
wenzelm@5828
   365
datatype transition = Transition of
wenzelm@16815
   366
 {name: string,                        (*command name*)
wenzelm@16815
   367
  pos: Position.T,                     (*source position*)
wenzelm@16815
   368
  source: OuterLex.token list option,  (*source text*)
wenzelm@16815
   369
  int_only: bool,                      (*interactive-only*)
wenzelm@16815
   370
  print: string list,                  (*print modes (union)*)
wenzelm@16815
   371
  no_timing: bool,                     (*suppress timing*)
wenzelm@16815
   372
  trans: trans list};                  (*primitive transitions (union)*)
wenzelm@5828
   373
wenzelm@14923
   374
fun make_transition (name, pos, source, int_only, print, no_timing, trans) =
wenzelm@14923
   375
  Transition {name = name, pos = pos, source = source,
wenzelm@14923
   376
    int_only = int_only, print = print, no_timing = no_timing, trans = trans};
wenzelm@5828
   377
wenzelm@14923
   378
fun map_transition f (Transition {name, pos, source, int_only, print, no_timing, trans}) =
wenzelm@14923
   379
  make_transition (f (name, pos, source, int_only, print, no_timing, trans));
wenzelm@5828
   380
wenzelm@16607
   381
val empty = make_transition ("<unknown>", Position.none, NONE, false, [], false, []);
wenzelm@14923
   382
wenzelm@14923
   383
fun name_of (Transition {name, ...}) = name;
wenzelm@14923
   384
fun source_of (Transition {source, ...}) = source;
wenzelm@5828
   385
wenzelm@5828
   386
wenzelm@5828
   387
(* diagnostics *)
wenzelm@5828
   388
wenzelm@5828
   389
fun str_of_transition (Transition {name, pos, ...}) = quote name ^ Position.str_of pos;
wenzelm@5828
   390
wenzelm@5828
   391
fun command_msg msg tr = msg ^ "command " ^ str_of_transition tr;
wenzelm@5828
   392
fun at_command tr = command_msg "At " tr ^ ".";
wenzelm@5828
   393
wenzelm@5828
   394
fun type_error tr state =
wenzelm@18685
   395
  ERROR (command_msg "Illegal application of " tr ^ " " ^ str_of_state state);
wenzelm@5828
   396
wenzelm@5828
   397
wenzelm@5828
   398
(* modify transitions *)
wenzelm@5828
   399
wenzelm@14923
   400
fun name nm = map_transition (fn (_, pos, source, int_only, print, no_timing, trans) =>
wenzelm@14923
   401
  (nm, pos, source, int_only, print, no_timing, trans));
wenzelm@5828
   402
wenzelm@14923
   403
fun position pos = map_transition (fn (name, _, source, int_only, print, no_timing, trans) =>
wenzelm@14923
   404
  (name, pos, source, int_only, print, no_timing, trans));
wenzelm@9010
   405
wenzelm@14923
   406
fun source src = map_transition (fn (name, pos, _, int_only, print, no_timing, trans) =>
skalberg@15531
   407
  (name, pos, SOME src, int_only, print, no_timing, trans));
wenzelm@5828
   408
wenzelm@14923
   409
fun interactive int_only = map_transition (fn (name, pos, source, _, print, no_timing, trans) =>
wenzelm@14923
   410
  (name, pos, source, int_only, print, no_timing, trans));
wenzelm@14923
   411
wenzelm@17363
   412
val no_timing = map_transition (fn (name, pos, source, int_only, print, _, trans) =>
wenzelm@17363
   413
  (name, pos, source, int_only, print, true, trans));
wenzelm@17363
   414
wenzelm@17363
   415
fun add_trans tr = map_transition (fn (name, pos, source, int_only, print, no_timing, trans) =>
wenzelm@17363
   416
  (name, pos, source, int_only, print, no_timing, trans @ [tr]));
wenzelm@17363
   417
wenzelm@16607
   418
fun print' mode = map_transition (fn (name, pos, source, int_only, print, no_timing, trans) =>
wenzelm@16607
   419
  (name, pos, source, int_only, insert (op =) mode print, no_timing, trans));
wenzelm@16607
   420
wenzelm@16607
   421
val print = print' "";
wenzelm@5828
   422
wenzelm@17363
   423
val three_buffersN = "three_buffers";
wenzelm@17363
   424
val print3 = print' three_buffersN;
wenzelm@5828
   425
wenzelm@5828
   426
wenzelm@5828
   427
(* build transitions *)
wenzelm@5828
   428
wenzelm@5828
   429
val reset = add_trans Reset;
wenzelm@6689
   430
fun init f exit kill = add_trans (Init (f, (exit, kill)));
wenzelm@6689
   431
val exit = add_trans Exit;
wenzelm@6689
   432
val kill = add_trans Kill;
wenzelm@7612
   433
val keep' = add_trans o Keep;
wenzelm@6689
   434
val history = add_trans o History;
wenzelm@18592
   435
fun map_current f = add_trans (Transaction (false, f));
wenzelm@18592
   436
fun app_current f = add_trans (Transaction (true, f));
wenzelm@5828
   437
wenzelm@7612
   438
fun keep f = add_trans (Keep (fn _ => f));
wenzelm@5828
   439
fun imperative f = keep (fn _ => f ());
wenzelm@5828
   440
wenzelm@6689
   441
fun init_theory f exit kill =
wenzelm@17076
   442
  init (fn int => Theory (f int, NONE))
wenzelm@17076
   443
    (fn Theory (thy, _) => exit thy | _ => raise UNDEF)
wenzelm@17076
   444
    (fn Theory (thy, _) => kill thy | _ => raise UNDEF);
wenzelm@5828
   445
wenzelm@15668
   446
wenzelm@15668
   447
(* typed transitions *)
wenzelm@15668
   448
wenzelm@18592
   449
fun theory f = app_current
wenzelm@18563
   450
  (K (fn Theory (thy, _) => Theory (f thy, NONE) | _ => raise UNDEF));
wenzelm@18563
   451
wenzelm@18592
   452
fun theory' f = app_current (fn int =>
wenzelm@17076
   453
  (fn Theory (thy, _) => Theory (f int thy, NONE) | _ => raise UNDEF));
wenzelm@17076
   454
wenzelm@18592
   455
fun theory_context f = app_current
wenzelm@18563
   456
  (K (fn Theory (thy, _) => Theory (apsnd SOME (f thy)) | _ => raise UNDEF));
wenzelm@15668
   457
wenzelm@18592
   458
fun theory_to_proof f = app_current (fn int =>
wenzelm@17076
   459
  (fn Theory (thy, _) =>
wenzelm@18592
   460
    if ! skip_proofs then
wenzelm@18592
   461
      SkipProof ((History.init (undo_limit int) 0, #1 (Proof.global_skip_proof int (f thy))), thy)
wenzelm@18592
   462
    else Proof (ProofHistory.init (undo_limit int) (f thy), thy)
wenzelm@18592
   463
  | _ => raise UNDEF));
wenzelm@18563
   464
wenzelm@17904
   465
fun proofs' f = map_current (fn int =>
wenzelm@18563
   466
  (fn Proof (prf, orig_thy) => Proof (ProofHistory.applys (f int) prf, orig_thy)
wenzelm@18563
   467
    | SkipProof ((h, thy), orig_thy) => SkipProof ((History.apply I h, thy), orig_thy)
wenzelm@16815
   468
    | _ => raise UNDEF));
wenzelm@15668
   469
wenzelm@17904
   470
fun proof' f = proofs' (Seq.single oo f);
wenzelm@17904
   471
val proofs = proofs' o K;
wenzelm@6689
   472
val proof = proof' o K;
wenzelm@16815
   473
wenzelm@16815
   474
fun actual_proof f = map_current (fn _ =>
wenzelm@18563
   475
  (fn Proof (prf, orig_thy) => Proof (f prf, orig_thy) | _ => raise UNDEF));
wenzelm@16815
   476
wenzelm@16815
   477
fun skip_proof f = map_current (fn _ =>
wenzelm@18563
   478
  (fn SkipProof ((h, thy), orig_thy) => SkipProof ((f h, thy), orig_thy) | _ => raise UNDEF));
wenzelm@15668
   479
wenzelm@17904
   480
fun end_proof f = map_current (fn int =>
wenzelm@18563
   481
  (fn Proof (prf, _) => Theory (f int (ProofHistory.current prf))
wenzelm@18563
   482
    | SkipProof ((h, thy), _) => if History.current h = 0 then Theory (thy, NONE) else raise UNDEF
wenzelm@18563
   483
    | _ => raise UNDEF));
wenzelm@18563
   484
wenzelm@18563
   485
val forget_proof = map_current (fn _ =>
wenzelm@18563
   486
  (fn Proof (_, orig_thy) => Theory (orig_thy, NONE)
wenzelm@18563
   487
    | SkipProof (_, orig_thy) => Theory (orig_thy, NONE)
berghofe@15237
   488
    | _ => raise UNDEF));
wenzelm@15668
   489
wenzelm@17076
   490
fun proof_to_theory' f = end_proof (rpair NONE oo f);
wenzelm@17076
   491
fun proof_to_theory f = proof_to_theory' (K f);
wenzelm@17115
   492
fun proof_to_theory_context f = end_proof (apsnd SOME oo f);
wenzelm@15668
   493
wenzelm@16815
   494
fun skip_proof_to_theory p = map_current (fn _ =>
wenzelm@18563
   495
  (fn SkipProof ((h, thy), _) =>
wenzelm@17904
   496
    if p (History.current h) then Theory (thy, NONE)
wenzelm@17904
   497
    else raise UNDEF
wenzelm@17904
   498
  | _ => raise UNDEF));
wenzelm@5828
   499
wenzelm@9512
   500
val unknown_theory = imperative (fn () => warning "Unknown theory context");
wenzelm@9512
   501
val unknown_proof = imperative (fn () => warning "Unknown proof context");
wenzelm@9512
   502
val unknown_context = imperative (fn () => warning "Unknown context");
wenzelm@9512
   503
wenzelm@5828
   504
wenzelm@5828
   505
wenzelm@5828
   506
(** toplevel transactions **)
wenzelm@5828
   507
wenzelm@5828
   508
(* print exceptions *)
wenzelm@5828
   509
wenzelm@15668
   510
local
wenzelm@15668
   511
wenzelm@15668
   512
fun with_context f xs =
wenzelm@15668
   513
  (case Context.get_context () of NONE => []
wenzelm@16452
   514
  | SOME thy => map (f thy) xs);
wenzelm@15668
   515
wenzelm@15668
   516
fun raised name [] = "exception " ^ name ^ " raised"
wenzelm@15668
   517
  | raised name [msg] = "exception " ^ name ^ " raised: " ^ msg
wenzelm@15668
   518
  | raised name msgs = cat_lines (("exception " ^ name ^ " raised:") :: msgs);
wenzelm@5828
   519
wenzelm@15668
   520
fun exn_msg _ TERMINATE = "Exit."
wenzelm@15668
   521
  | exn_msg _ RESTART = "Restart."
wenzelm@15668
   522
  | exn_msg _ Interrupt = "Interrupt."
wenzelm@18685
   523
  | exn_msg _ Output.TOPLEVEL_ERROR = "Error."
wenzelm@18685
   524
  | exn_msg _ (ERROR msg) = msg
wenzelm@17363
   525
  | exn_msg detailed (EXCEPTION (exn, msg)) = cat_lines [exn_msg detailed exn, msg]
wenzelm@16452
   526
  | exn_msg detailed (EXCURSION_FAIL (exn, msg)) = cat_lines [exn_msg detailed exn, msg]
wenzelm@15668
   527
  | exn_msg false (THEORY (msg, _)) = msg
wenzelm@16452
   528
  | exn_msg true (THEORY (msg, thys)) = raised "THEORY" (msg :: map Context.str_of_thy thys)
wenzelm@15668
   529
  | exn_msg detailed (MetaSimplifier.SIMPROC_FAIL (name, exn)) =
wenzelm@15668
   530
      fail_msg detailed "simproc" ((name, Position.none), exn)
wenzelm@15668
   531
  | exn_msg detailed (Attrib.ATTRIB_FAIL info) = fail_msg detailed "attribute" info
wenzelm@15668
   532
  | exn_msg detailed (Method.METHOD_FAIL info) = fail_msg detailed "method" info
wenzelm@15668
   533
  | exn_msg detailed (Antiquote.ANTIQUOTE_FAIL info) = fail_msg detailed "antiquotation" info
wenzelm@15668
   534
  | exn_msg false (Syntax.AST (msg, _)) = raised "AST" [msg]
wenzelm@15668
   535
  | exn_msg true (Syntax.AST (msg, asts)) =
wenzelm@15668
   536
      raised "AST" (msg :: map (Pretty.string_of o Syntax.pretty_ast) asts)
wenzelm@15668
   537
  | exn_msg false (TYPE (msg, _, _)) = raised "TYPE" [msg]
wenzelm@15668
   538
  | exn_msg true (TYPE (msg, Ts, ts)) = raised "TYPE" (msg ::
wenzelm@15668
   539
        with_context Sign.string_of_typ Ts @ with_context Sign.string_of_term ts)
wenzelm@15668
   540
  | exn_msg false (TERM (msg, _)) = raised "TERM" [msg]
wenzelm@15668
   541
  | exn_msg true (TERM (msg, ts)) = raised "TERM" (msg :: with_context Sign.string_of_term ts)
wenzelm@15668
   542
  | exn_msg false (THM (msg, _, _)) = raised "THM" [msg]
wenzelm@15668
   543
  | exn_msg true (THM (msg, i, thms)) =
wenzelm@15668
   544
      raised ("THM " ^ string_of_int i) (msg :: map Display.string_of_thm thms)
wenzelm@15668
   545
  | exn_msg _ Option = raised "Option" []
wenzelm@15668
   546
  | exn_msg _ UnequalLengths = raised "UnequalLengths" []
wenzelm@15668
   547
  | exn_msg _ Empty = raised "Empty" []
wenzelm@15668
   548
  | exn_msg _ Subscript = raised "Subscript" []
wenzelm@16197
   549
  | exn_msg _ (Fail msg) = raised "Fail" [msg]
wenzelm@15668
   550
  | exn_msg _ exn = General.exnMessage exn
wenzelm@15668
   551
and fail_msg detailed kind ((name, pos), exn) =
wenzelm@15668
   552
  "Error in " ^ kind ^ " " ^ quote name ^ Position.str_of pos ^ ":\n" ^ exn_msg detailed exn;
ballarin@15519
   553
wenzelm@15668
   554
in
wenzelm@15668
   555
wenzelm@15668
   556
fun exn_message exn = exn_msg (! debug) exn;
wenzelm@5828
   557
skalberg@15531
   558
fun print_exn NONE = ()
wenzelm@18685
   559
  | print_exn (SOME (exn, s)) = Output.error_msg (cat_lines [exn_message exn, s]);
wenzelm@5828
   560
wenzelm@15668
   561
end;
wenzelm@15668
   562
wenzelm@5828
   563
wenzelm@5828
   564
(* apply transitions *)
wenzelm@5828
   565
wenzelm@6664
   566
local
wenzelm@6664
   567
wenzelm@9010
   568
fun app int (tr as Transition {trans, int_only, print, no_timing, ...}) state =
wenzelm@5828
   569
  let
wenzelm@16682
   570
    val _ = conditional (not int andalso int_only) (fn () =>
wenzelm@16682
   571
      warning (command_msg "Interactive-only " tr));
wenzelm@16682
   572
wenzelm@18685
   573
    fun do_timing f x = (Output.info (command_msg "" tr); timeap f x);
wenzelm@16682
   574
    fun do_profiling f x = profile (! profiling) f x;
wenzelm@16682
   575
wenzelm@6689
   576
    val (result, opt_exn) =
wenzelm@16729
   577
       state |> (apply_trans int trans
wenzelm@16729
   578
        |> (if ! profiling > 0 then do_profiling else I)
wenzelm@16729
   579
        |> (if ! profiling > 0 orelse ! timing andalso not no_timing then do_timing else I));
wenzelm@16607
   580
    val _ = conditional (int andalso not (! quiet) andalso
wenzelm@16607
   581
        exists (fn m => m mem_string print) ("" :: ! print_mode))
wenzelm@16607
   582
      (fn () => print_state false result);
skalberg@15570
   583
  in (result, Option.map (fn UNDEF => type_error tr state | exn => exn) opt_exn) end;
wenzelm@6664
   584
wenzelm@6664
   585
in
wenzelm@5828
   586
wenzelm@6689
   587
fun apply int tr st =
wenzelm@6965
   588
  (case app int tr st of
skalberg@15531
   589
    (_, SOME TERMINATE) => NONE
skalberg@15531
   590
  | (_, SOME RESTART) => SOME (toplevel, NONE)
skalberg@15531
   591
  | (state', SOME (EXCURSION_FAIL exn_info)) => SOME (state', SOME exn_info)
skalberg@15531
   592
  | (state', SOME exn) => SOME (state', SOME (exn, at_command tr))
skalberg@15531
   593
  | (state', NONE) => SOME (state', NONE));
wenzelm@6664
   594
wenzelm@17266
   595
fun command tr st =
wenzelm@17266
   596
  (case apply false tr st of
wenzelm@17266
   597
    SOME (st', NONE) => st'
wenzelm@17266
   598
  | SOME (st', SOME exn_info) => raise EXCURSION_FAIL exn_info
wenzelm@17266
   599
  | NONE => raise EXCURSION_FAIL (TERMINATE, at_command tr));
wenzelm@17266
   600
wenzelm@6664
   601
end;
wenzelm@5828
   602
wenzelm@5828
   603
wenzelm@17076
   604
(* excursion: toplevel -- apply transformers/presentation -- toplevel *)
wenzelm@5828
   605
wenzelm@6664
   606
local
wenzelm@6664
   607
wenzelm@5828
   608
fun excur [] x = x
wenzelm@17076
   609
  | excur ((tr, pr) :: trs) (st, res) =
wenzelm@17321
   610
      (case apply (! interact) tr st of
skalberg@15531
   611
        SOME (st', NONE) =>
wenzelm@18685
   612
          excur trs (st', pr st st' res handle exn =>
wenzelm@10324
   613
            raise EXCURSION_FAIL (exn, "Presentation failed\n" ^ at_command tr))
skalberg@15531
   614
      | SOME (st', SOME exn_info) => raise EXCURSION_FAIL exn_info
skalberg@15531
   615
      | NONE => raise EXCURSION_FAIL (TERMINATE, at_command tr));
wenzelm@5828
   616
wenzelm@17076
   617
fun no_pr _ _ _ = ();
wenzelm@17076
   618
wenzelm@6664
   619
in
wenzelm@6664
   620
wenzelm@17076
   621
fun present_excursion trs res =
skalberg@15531
   622
  (case excur trs (State NONE, res) of
skalberg@15531
   623
    (State NONE, res') => res'
wenzelm@18685
   624
  | _ => error "Unfinished development at end of input")
wenzelm@9134
   625
  handle exn => error (exn_message exn);
wenzelm@9134
   626
wenzelm@17076
   627
fun excursion trs = present_excursion (map (rpair no_pr) trs) ();
wenzelm@7062
   628
wenzelm@6664
   629
end;
wenzelm@6664
   630
wenzelm@5828
   631
wenzelm@18685
   632
(* program: independent of state *)
wenzelm@18685
   633
wenzelm@18685
   634
fun program f =
wenzelm@18685
   635
  ((fn () => debugging f () handle exn => error (exn_message exn))
wenzelm@18685
   636
    |> setmp Output.do_toplevel_errors true
wenzelm@18685
   637
    |> Output.toplevel_errors) ();
wenzelm@18685
   638
wenzelm@18685
   639
wenzelm@5828
   640
wenzelm@5828
   641
(** interactive transformations **)
wenzelm@5828
   642
wenzelm@5828
   643
(* the global state reference *)
wenzelm@5828
   644
skalberg@15531
   645
val global_state = ref (toplevel, NONE: (exn * string) option);
wenzelm@5828
   646
skalberg@15531
   647
fun set_state state = global_state := (state, NONE);
wenzelm@5828
   648
fun get_state () = fst (! global_state);
wenzelm@5828
   649
fun exn () = snd (! global_state);
wenzelm@5828
   650
wenzelm@5828
   651
wenzelm@6965
   652
(* the Isar source of transitions *)
wenzelm@6965
   653
nipkow@14091
   654
type 'a isar =
wenzelm@6965
   655
  (transition, (transition option,
wenzelm@12881
   656
    (OuterLex.token, (OuterLex.token option, (OuterLex.token, (OuterLex.token,
nipkow@14091
   657
      Position.T * (Symbol.symbol, (string, 'a) Source.source) Source.source)
wenzelm@12881
   658
          Source.source) Source.source) Source.source) Source.source) Source.source) Source.source;
wenzelm@6965
   659
wenzelm@6965
   660
wenzelm@5828
   661
(* apply transformers to global state *)
wenzelm@5828
   662
wenzelm@14985
   663
nonfix >> >>>;
wenzelm@5828
   664
wenzelm@5828
   665
fun >> tr =
wenzelm@5828
   666
  (case apply true tr (get_state ()) of
skalberg@15531
   667
    NONE => false
skalberg@15531
   668
  | SOME (state', exn_info) =>
wenzelm@5828
   669
      (global_state := (state', exn_info);
wenzelm@16729
   670
        print_exn exn_info;
wenzelm@5828
   671
        true));
wenzelm@5828
   672
wenzelm@14985
   673
fun >>> [] = ()
wenzelm@14985
   674
  | >>> (tr :: trs) = if >> tr then >>> trs else ();
wenzelm@14985
   675
wenzelm@17513
   676
(*Spurious interrupts ahead!  Race condition?*)
wenzelm@17513
   677
fun get_interrupt src = SOME (Source.get_single src) handle Interrupt => NONE;
wenzelm@7602
   678
wenzelm@5828
   679
fun raw_loop src =
wenzelm@7602
   680
  (case get_interrupt (Source.set_prompt (prompt_state (get_state ())) src) of
skalberg@15531
   681
    NONE => (writeln "\nInterrupt."; raw_loop src)
skalberg@15531
   682
  | SOME NONE => ()
skalberg@15531
   683
  | SOME (SOME (tr, src')) => if >> tr then raw_loop src' else ());
wenzelm@5828
   684
wenzelm@12987
   685
fun loop src = ignore_interrupt raw_loop src;
wenzelm@5828
   686
wenzelm@5828
   687
end;