src/Pure/Isar/toplevel.ML
author paulson
Tue Sep 20 13:17:32 2005 +0200 (2005-09-20 ago)
changeset 17500 964bad535ac6
parent 17452 178344c74562
child 17513 0393718c2f1c
permissions -rw-r--r--
uniform handling of interrupts
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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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  datatype node =
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    Theory of theory * Proof.context option |
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    Proof of ProofHistory.T |
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    SkipProof of int History.T * theory
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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 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 theory_of: state -> theory
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  val sign_of: state -> theory    (*obsolete*)
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  val body_context_of: state -> Proof.context
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  val no_body_context: state -> state
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  val proof_of: state -> Proof.state
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  val is_proof: state -> bool
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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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  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: (ProofHistory.T -> ProofHistory.T) -> transition -> transition
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  val proof': (bool -> ProofHistory.T -> ProofHistory.T) -> 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: (ProofHistory.T -> theory) -> transition -> transition
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  val proof_to_theory': (bool -> ProofHistory.T -> theory) -> transition -> transition
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  val proof_to_theory_context: (bool -> ProofHistory.T -> theory * Proof.context)
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    -> transition -> transition
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  val skip_proof_to_theory: (int History.T -> bool) -> 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 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 |                  (*history of proof states*)
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  SkipProof of int History.T * theory;       (*history of proof depths*)
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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 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 theory_of = node_case I Proof.theory_of;
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val sign_of = 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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fun no_body_context (State NONE) = State NONE
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  | no_body_context (State (SOME (node, x))) =
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      State (SOME (History.apply (fn Theory (thy, _) => Theory (thy, NONE) | nd => nd) node, x));
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val proof_of = node_case (fn _ => raise UNDEF) I;
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val is_proof = can proof_of;
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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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(* 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_MESSAGE "Stale theory encountered after succesful execution!";
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fun checkpoint_node true (Theory (thy, ctxt)) = Theory (Theory.checkpoint thy, ctxt)
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  | checkpoint_node _ node = node;
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fun copy_node true (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 debug_trans f x =
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  if ! debug then
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    setmp Output.transform_exceptions false
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      exception_trace (fn () => f x)
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  else f x;
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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 int hist f (State (SOME (node, term))) =
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      let
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        val cont_node = History.map (checkpoint_node int) node;
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        val back_node = History.map (copy_node int) 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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          |> ((fn nd => f int nd)
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              |> (if hist then History.apply_copy (copy_node int) else History.map)
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              |> debug_trans
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              |> interruptible
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              |> transform_error)
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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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end;
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(* primitive transitions *)
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(*NB: recovery from stale theories is provided only for theory-level
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  operations via MapCurrent and AppCurrent.  Other node or state
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  operations should not touch theories at all.
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  Interrupts are enabled only for Keep, MapCurrent, and AppCurrent.*)
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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; provide 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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  MapCurrent of bool -> node -> node |          (*change node, bypassing history*)
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  AppCurrent of bool -> node -> node;           (*change node, recording history*)
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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))
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  | apply_tr int (MapCurrent f) state = transaction int false f state
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  | apply_tr int (AppCurrent f) state = transaction int true f state;
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fun apply_union _ [] state = raise FAILURE (state, UNDEF)
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  | apply_union int (tr :: trs) state =
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      transform_error (apply_tr int tr) state
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        handle UNDEF => apply_union int trs state
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          | FAILURE (alt_state, UNDEF) => apply_union int trs alt_state
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          | exn as FAILURE _ => raise exn
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          | exn => raise FAILURE (state, exn);
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in
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fun apply_trans int trs state = (apply_union int trs state, NONE)
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  handle FAILURE (alt_state, exn) => (alt_state, SOME exn) | exn => (state, SOME exn);
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end;
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(* datatype transition *)
wenzelm@5828
   346
wenzelm@5828
   347
datatype transition = Transition of
wenzelm@16815
   348
 {name: string,                        (*command name*)
wenzelm@16815
   349
  pos: Position.T,                     (*source position*)
wenzelm@16815
   350
  source: OuterLex.token list option,  (*source text*)
wenzelm@16815
   351
  int_only: bool,                      (*interactive-only*)
wenzelm@16815
   352
  print: string list,                  (*print modes (union)*)
wenzelm@16815
   353
  no_timing: bool,                     (*suppress timing*)
wenzelm@16815
   354
  trans: trans list};                  (*primitive transitions (union)*)
wenzelm@5828
   355
wenzelm@14923
   356
fun make_transition (name, pos, source, int_only, print, no_timing, trans) =
wenzelm@14923
   357
  Transition {name = name, pos = pos, source = source,
wenzelm@14923
   358
    int_only = int_only, print = print, no_timing = no_timing, trans = trans};
wenzelm@5828
   359
wenzelm@14923
   360
fun map_transition f (Transition {name, pos, source, int_only, print, no_timing, trans}) =
wenzelm@14923
   361
  make_transition (f (name, pos, source, int_only, print, no_timing, trans));
wenzelm@5828
   362
wenzelm@16607
   363
val empty = make_transition ("<unknown>", Position.none, NONE, false, [], false, []);
wenzelm@14923
   364
wenzelm@14923
   365
fun name_of (Transition {name, ...}) = name;
wenzelm@14923
   366
fun source_of (Transition {source, ...}) = source;
wenzelm@5828
   367
wenzelm@5828
   368
wenzelm@5828
   369
(* diagnostics *)
wenzelm@5828
   370
wenzelm@5828
   371
fun str_of_transition (Transition {name, pos, ...}) = quote name ^ Position.str_of pos;
wenzelm@5828
   372
wenzelm@5828
   373
fun command_msg msg tr = msg ^ "command " ^ str_of_transition tr;
wenzelm@5828
   374
fun at_command tr = command_msg "At " tr ^ ".";
wenzelm@5828
   375
wenzelm@5828
   376
fun type_error tr state =
wenzelm@6689
   377
  ERROR_MESSAGE (command_msg "Illegal application of " tr ^ " " ^ str_of_state state);
wenzelm@5828
   378
wenzelm@5828
   379
wenzelm@5828
   380
(* modify transitions *)
wenzelm@5828
   381
wenzelm@14923
   382
fun name nm = map_transition (fn (_, pos, source, int_only, print, no_timing, trans) =>
wenzelm@14923
   383
  (nm, pos, source, int_only, print, no_timing, trans));
wenzelm@5828
   384
wenzelm@14923
   385
fun position pos = map_transition (fn (name, _, source, int_only, print, no_timing, trans) =>
wenzelm@14923
   386
  (name, pos, source, int_only, print, no_timing, trans));
wenzelm@9010
   387
wenzelm@14923
   388
fun source src = map_transition (fn (name, pos, _, int_only, print, no_timing, trans) =>
skalberg@15531
   389
  (name, pos, SOME src, int_only, print, no_timing, trans));
wenzelm@5828
   390
wenzelm@14923
   391
fun interactive int_only = map_transition (fn (name, pos, source, _, print, no_timing, trans) =>
wenzelm@14923
   392
  (name, pos, source, int_only, print, no_timing, trans));
wenzelm@14923
   393
wenzelm@17363
   394
val no_timing = map_transition (fn (name, pos, source, int_only, print, _, trans) =>
wenzelm@17363
   395
  (name, pos, source, int_only, print, true, trans));
wenzelm@17363
   396
wenzelm@17363
   397
fun add_trans tr = map_transition (fn (name, pos, source, int_only, print, no_timing, trans) =>
wenzelm@17363
   398
  (name, pos, source, int_only, print, no_timing, trans @ [tr]));
wenzelm@17363
   399
wenzelm@16607
   400
fun print' mode = map_transition (fn (name, pos, source, int_only, print, no_timing, trans) =>
wenzelm@16607
   401
  (name, pos, source, int_only, insert (op =) mode print, no_timing, trans));
wenzelm@16607
   402
wenzelm@16607
   403
val print = print' "";
wenzelm@5828
   404
wenzelm@17363
   405
val three_buffersN = "three_buffers";
wenzelm@17363
   406
val print3 = print' three_buffersN;
wenzelm@5828
   407
wenzelm@5828
   408
wenzelm@5828
   409
(* build transitions *)
wenzelm@5828
   410
wenzelm@5828
   411
val reset = add_trans Reset;
wenzelm@6689
   412
fun init f exit kill = add_trans (Init (f, (exit, kill)));
wenzelm@6689
   413
val exit = add_trans Exit;
wenzelm@6689
   414
val kill = add_trans Kill;
wenzelm@7612
   415
val keep' = add_trans o Keep;
wenzelm@6689
   416
val history = add_trans o History;
wenzelm@5828
   417
val map_current = add_trans o MapCurrent;
wenzelm@6689
   418
val app_current = add_trans o AppCurrent;
wenzelm@5828
   419
wenzelm@7612
   420
fun keep f = add_trans (Keep (fn _ => f));
wenzelm@5828
   421
fun imperative f = keep (fn _ => f ());
wenzelm@5828
   422
wenzelm@6689
   423
fun init_theory f exit kill =
wenzelm@17076
   424
  init (fn int => Theory (f int, NONE))
wenzelm@17076
   425
    (fn Theory (thy, _) => exit thy | _ => raise UNDEF)
wenzelm@17076
   426
    (fn Theory (thy, _) => kill thy | _ => raise UNDEF);
wenzelm@5828
   427
wenzelm@15668
   428
wenzelm@15668
   429
(* typed transitions *)
wenzelm@15668
   430
wenzelm@17076
   431
fun theory f = app_current (K (fn Theory (thy, _) => Theory (f thy, NONE) | _ => raise UNDEF));
wenzelm@17076
   432
fun theory' f = app_current (fn int =>
wenzelm@17076
   433
  (fn Theory (thy, _) => Theory (f int thy, NONE) | _ => raise UNDEF));
wenzelm@17076
   434
wenzelm@17076
   435
fun theory_context f =
wenzelm@17076
   436
  app_current (K (fn Theory (thy, _) => Theory (apsnd SOME (f thy)) | _ => raise UNDEF));
wenzelm@15668
   437
berghofe@15237
   438
fun theory_to_proof f = app_current (fn int =>
wenzelm@17076
   439
  (fn Theory (thy, _) =>
wenzelm@17452
   440
      let val st = f thy in
wenzelm@17452
   441
        if Theory.eq_thy (thy, Proof.theory_of st) then ()
wenzelm@17452
   442
        else error "Theory changed at start of proof";
wenzelm@17452
   443
        if ! skip_proofs then
wenzelm@17452
   444
          SkipProof (History.init (undo_limit int) 0, #1 (Proof.global_skip_proof int st))
wenzelm@17452
   445
        else Proof (ProofHistory.init (undo_limit int) st)
wenzelm@17452
   446
      end
berghofe@15237
   447
    | _ => raise UNDEF));
wenzelm@15668
   448
wenzelm@16815
   449
fun proof' f = map_current (fn int =>
wenzelm@16815
   450
  (fn Proof prf => Proof (f int prf)
wenzelm@16815
   451
    | SkipProof (h, thy) => SkipProof (History.apply I h, thy)   (*approximate f*)
wenzelm@16815
   452
    | _ => raise UNDEF));
wenzelm@15668
   453
wenzelm@6689
   454
val proof = proof' o K;
wenzelm@16815
   455
wenzelm@16815
   456
fun actual_proof f = map_current (fn _ =>
wenzelm@16815
   457
  (fn Proof prf => Proof (f prf) | _ => raise UNDEF));
wenzelm@16815
   458
wenzelm@16815
   459
fun skip_proof f = map_current (fn _ =>
wenzelm@16815
   460
  (fn SkipProof (h, thy) => SkipProof (f h, thy) | _ => raise UNDEF));
wenzelm@15668
   461
wenzelm@17076
   462
fun end_proof f =
berghofe@15237
   463
  map_current (fn int => (fn Proof prf => Theory (f int prf)
wenzelm@17076
   464
    | SkipProof (h, thy) => if History.current h = 0 then Theory (thy, NONE) else raise UNDEF
berghofe@15237
   465
    | _ => raise UNDEF));
wenzelm@15668
   466
wenzelm@17076
   467
fun proof_to_theory' f = end_proof (rpair NONE oo f);
wenzelm@17076
   468
fun proof_to_theory f = proof_to_theory' (K f);
wenzelm@17115
   469
fun proof_to_theory_context f = end_proof (apsnd SOME oo f);
wenzelm@15668
   470
wenzelm@16815
   471
fun skip_proof_to_theory p = map_current (fn _ =>
wenzelm@17076
   472
  (fn SkipProof (h, thy) => if p h then Theory (thy, NONE) else raise UNDEF | _ => raise UNDEF));
wenzelm@5828
   473
wenzelm@9512
   474
val unknown_theory = imperative (fn () => warning "Unknown theory context");
wenzelm@9512
   475
val unknown_proof = imperative (fn () => warning "Unknown proof context");
wenzelm@9512
   476
val unknown_context = imperative (fn () => warning "Unknown context");
wenzelm@9512
   477
wenzelm@5828
   478
wenzelm@5828
   479
wenzelm@5828
   480
(** toplevel transactions **)
wenzelm@5828
   481
wenzelm@5828
   482
(* print exceptions *)
wenzelm@5828
   483
wenzelm@15668
   484
local
wenzelm@15668
   485
wenzelm@15668
   486
fun with_context f xs =
wenzelm@15668
   487
  (case Context.get_context () of NONE => []
wenzelm@16452
   488
  | SOME thy => map (f thy) xs);
wenzelm@15668
   489
wenzelm@15668
   490
fun raised name [] = "exception " ^ name ^ " raised"
wenzelm@15668
   491
  | raised name [msg] = "exception " ^ name ^ " raised: " ^ msg
wenzelm@15668
   492
  | raised name msgs = cat_lines (("exception " ^ name ^ " raised:") :: msgs);
wenzelm@5828
   493
wenzelm@15668
   494
fun exn_msg _ TERMINATE = "Exit."
wenzelm@15668
   495
  | exn_msg _ RESTART = "Restart."
wenzelm@15668
   496
  | exn_msg _ Interrupt = "Interrupt."
wenzelm@15668
   497
  | exn_msg _ ERROR = "ERROR."
wenzelm@15668
   498
  | exn_msg _ (ERROR_MESSAGE msg) = msg
wenzelm@17363
   499
  | exn_msg detailed (EXCEPTION (exn, msg)) = cat_lines [exn_msg detailed exn, msg]
wenzelm@16452
   500
  | exn_msg detailed (EXCURSION_FAIL (exn, msg)) = cat_lines [exn_msg detailed exn, msg]
wenzelm@15668
   501
  | exn_msg false (THEORY (msg, _)) = msg
wenzelm@16452
   502
  | exn_msg true (THEORY (msg, thys)) = raised "THEORY" (msg :: map Context.str_of_thy thys)
wenzelm@15668
   503
  | exn_msg _ (ProofContext.CONTEXT (msg, _)) = msg
wenzelm@15668
   504
  | exn_msg _ (Proof.STATE (msg, _)) = msg
wenzelm@15668
   505
  | exn_msg _ (ProofHistory.FAIL msg) = msg
wenzelm@15668
   506
  | exn_msg detailed (MetaSimplifier.SIMPROC_FAIL (name, exn)) =
wenzelm@15668
   507
      fail_msg detailed "simproc" ((name, Position.none), exn)
wenzelm@15668
   508
  | exn_msg detailed (Attrib.ATTRIB_FAIL info) = fail_msg detailed "attribute" info
wenzelm@15668
   509
  | exn_msg detailed (Method.METHOD_FAIL info) = fail_msg detailed "method" info
wenzelm@15668
   510
  | exn_msg detailed (Antiquote.ANTIQUOTE_FAIL info) = fail_msg detailed "antiquotation" info
wenzelm@15668
   511
  | exn_msg false (Syntax.AST (msg, _)) = raised "AST" [msg]
wenzelm@15668
   512
  | exn_msg true (Syntax.AST (msg, asts)) =
wenzelm@15668
   513
      raised "AST" (msg :: map (Pretty.string_of o Syntax.pretty_ast) asts)
wenzelm@15668
   514
  | exn_msg false (TYPE (msg, _, _)) = raised "TYPE" [msg]
wenzelm@15668
   515
  | exn_msg true (TYPE (msg, Ts, ts)) = raised "TYPE" (msg ::
wenzelm@15668
   516
        with_context Sign.string_of_typ Ts @ with_context Sign.string_of_term ts)
wenzelm@15668
   517
  | exn_msg false (TERM (msg, _)) = raised "TERM" [msg]
wenzelm@15668
   518
  | exn_msg true (TERM (msg, ts)) = raised "TERM" (msg :: with_context Sign.string_of_term ts)
wenzelm@15668
   519
  | exn_msg false (THM (msg, _, _)) = raised "THM" [msg]
wenzelm@15668
   520
  | exn_msg true (THM (msg, i, thms)) =
wenzelm@15668
   521
      raised ("THM " ^ string_of_int i) (msg :: map Display.string_of_thm thms)
wenzelm@15668
   522
  | exn_msg _ Option = raised "Option" []
wenzelm@15668
   523
  | exn_msg _ UnequalLengths = raised "UnequalLengths" []
wenzelm@15668
   524
  | exn_msg _ Empty = raised "Empty" []
wenzelm@15668
   525
  | exn_msg _ Subscript = raised "Subscript" []
wenzelm@16197
   526
  | exn_msg _ (Fail msg) = raised "Fail" [msg]
wenzelm@15668
   527
  | exn_msg _ exn = General.exnMessage exn
wenzelm@15668
   528
and fail_msg detailed kind ((name, pos), exn) =
wenzelm@15668
   529
  "Error in " ^ kind ^ " " ^ quote name ^ Position.str_of pos ^ ":\n" ^ exn_msg detailed exn;
ballarin@15519
   530
wenzelm@15668
   531
in
wenzelm@15668
   532
wenzelm@15668
   533
fun exn_message exn = exn_msg (! debug) exn;
wenzelm@5828
   534
skalberg@15531
   535
fun print_exn NONE = ()
skalberg@15531
   536
  | print_exn (SOME (exn, s)) = error_msg (cat_lines [exn_message exn, s]);
wenzelm@5828
   537
wenzelm@15668
   538
end;
wenzelm@15668
   539
wenzelm@5828
   540
wenzelm@5828
   541
(* apply transitions *)
wenzelm@5828
   542
wenzelm@6664
   543
local
wenzelm@6664
   544
wenzelm@9010
   545
fun app int (tr as Transition {trans, int_only, print, no_timing, ...}) state =
wenzelm@5828
   546
  let
wenzelm@16682
   547
    val _ = conditional (not int andalso int_only) (fn () =>
wenzelm@16682
   548
      warning (command_msg "Interactive-only " tr));
wenzelm@16682
   549
wenzelm@16682
   550
    fun do_timing f x = (info (command_msg "" tr); timeap f x);
wenzelm@16682
   551
    fun do_profiling f x = profile (! profiling) f x;
wenzelm@16682
   552
wenzelm@6689
   553
    val (result, opt_exn) =
wenzelm@16729
   554
       state |> (apply_trans int trans
wenzelm@16729
   555
        |> (if ! profiling > 0 then do_profiling else I)
wenzelm@16729
   556
        |> (if ! profiling > 0 orelse ! timing andalso not no_timing then do_timing else I));
wenzelm@16607
   557
    val _ = conditional (int andalso not (! quiet) andalso
wenzelm@16607
   558
        exists (fn m => m mem_string print) ("" :: ! print_mode))
wenzelm@16607
   559
      (fn () => print_state false result);
skalberg@15570
   560
  in (result, Option.map (fn UNDEF => type_error tr state | exn => exn) opt_exn) end;
wenzelm@6664
   561
wenzelm@6664
   562
in
wenzelm@5828
   563
wenzelm@6689
   564
fun apply int tr st =
wenzelm@6965
   565
  (case app int tr st of
skalberg@15531
   566
    (_, SOME TERMINATE) => NONE
skalberg@15531
   567
  | (_, SOME RESTART) => SOME (toplevel, NONE)
skalberg@15531
   568
  | (state', SOME (EXCURSION_FAIL exn_info)) => SOME (state', SOME exn_info)
skalberg@15531
   569
  | (state', SOME exn) => SOME (state', SOME (exn, at_command tr))
skalberg@15531
   570
  | (state', NONE) => SOME (state', NONE));
wenzelm@6664
   571
wenzelm@17266
   572
fun command tr st =
wenzelm@17266
   573
  (case apply false tr st of
wenzelm@17266
   574
    SOME (st', NONE) => st'
wenzelm@17266
   575
  | SOME (st', SOME exn_info) => raise EXCURSION_FAIL exn_info
wenzelm@17266
   576
  | NONE => raise EXCURSION_FAIL (TERMINATE, at_command tr));
wenzelm@17266
   577
wenzelm@6664
   578
end;
wenzelm@5828
   579
wenzelm@5828
   580
wenzelm@17076
   581
(* excursion: toplevel -- apply transformers/presentation -- toplevel *)
wenzelm@5828
   582
wenzelm@6664
   583
local
wenzelm@6664
   584
wenzelm@5828
   585
fun excur [] x = x
wenzelm@17076
   586
  | excur ((tr, pr) :: trs) (st, res) =
wenzelm@17321
   587
      (case apply (! interact) tr st of
skalberg@15531
   588
        SOME (st', NONE) =>
wenzelm@17076
   589
          excur trs (st', transform_error (fn () => pr st st' res) () handle exn =>
wenzelm@10324
   590
            raise EXCURSION_FAIL (exn, "Presentation failed\n" ^ at_command tr))
skalberg@15531
   591
      | SOME (st', SOME exn_info) => raise EXCURSION_FAIL exn_info
skalberg@15531
   592
      | NONE => raise EXCURSION_FAIL (TERMINATE, at_command tr));
wenzelm@5828
   593
wenzelm@17076
   594
fun no_pr _ _ _ = ();
wenzelm@17076
   595
wenzelm@6664
   596
in
wenzelm@6664
   597
wenzelm@17076
   598
fun present_excursion trs res =
skalberg@15531
   599
  (case excur trs (State NONE, res) of
skalberg@15531
   600
    (State NONE, res') => res'
wenzelm@9134
   601
  | _ => raise ERROR_MESSAGE "Unfinished development at end of input")
wenzelm@9134
   602
  handle exn => error (exn_message exn);
wenzelm@9134
   603
wenzelm@17076
   604
fun excursion trs = present_excursion (map (rpair no_pr) trs) ();
wenzelm@7062
   605
wenzelm@6664
   606
end;
wenzelm@6664
   607
wenzelm@5828
   608
wenzelm@5828
   609
wenzelm@5828
   610
(** interactive transformations **)
wenzelm@5828
   611
wenzelm@5828
   612
(* the global state reference *)
wenzelm@5828
   613
skalberg@15531
   614
val global_state = ref (toplevel, NONE: (exn * string) option);
wenzelm@5828
   615
skalberg@15531
   616
fun set_state state = global_state := (state, NONE);
wenzelm@5828
   617
fun get_state () = fst (! global_state);
wenzelm@5828
   618
fun exn () = snd (! global_state);
wenzelm@5828
   619
wenzelm@5828
   620
wenzelm@6965
   621
(* the Isar source of transitions *)
wenzelm@6965
   622
nipkow@14091
   623
type 'a isar =
wenzelm@6965
   624
  (transition, (transition option,
wenzelm@12881
   625
    (OuterLex.token, (OuterLex.token option, (OuterLex.token, (OuterLex.token,
nipkow@14091
   626
      Position.T * (Symbol.symbol, (string, 'a) Source.source) Source.source)
wenzelm@12881
   627
          Source.source) Source.source) Source.source) Source.source) Source.source) Source.source;
wenzelm@6965
   628
wenzelm@6965
   629
wenzelm@5828
   630
(* apply transformers to global state *)
wenzelm@5828
   631
wenzelm@14985
   632
nonfix >> >>>;
wenzelm@5828
   633
wenzelm@5828
   634
fun >> tr =
wenzelm@5828
   635
  (case apply true tr (get_state ()) of
skalberg@15531
   636
    NONE => false
skalberg@15531
   637
  | SOME (state', exn_info) =>
wenzelm@5828
   638
      (global_state := (state', exn_info);
wenzelm@16729
   639
        print_exn exn_info;
wenzelm@5828
   640
        true));
wenzelm@5828
   641
wenzelm@14985
   642
fun >>> [] = ()
wenzelm@14985
   643
  | >>> (tr :: trs) = if >> tr then >>> trs else ();
wenzelm@14985
   644
paulson@17434
   645
(*Note: we really do not intend to exhibit interrupts here.
paulson@17434
   646
  Poly/ML needs exception Interrupt to be handled. SML/NJ needs IO to be handled.*)
paulson@17434
   647
fun get_interrupt src = SOME (Source.get_single src) 
paulson@17434
   648
                        handle Interrupt => NONE
paulson@17500
   649
                             | IO.Io _ => NONE;
wenzelm@7602
   650
wenzelm@5828
   651
fun raw_loop src =
wenzelm@7602
   652
  (case get_interrupt (Source.set_prompt (prompt_state (get_state ())) src) of
skalberg@15531
   653
    NONE => (writeln "\nInterrupt."; raw_loop src)
skalberg@15531
   654
  | SOME NONE => ()
skalberg@15531
   655
  | SOME (SOME (tr, src')) => if >> tr then raw_loop src' else ());
wenzelm@5828
   656
wenzelm@12987
   657
fun loop src = ignore_interrupt raw_loop src;
wenzelm@5828
   658
wenzelm@5828
   659
end;