src/Pure/Isar/isar_cmd.ML
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print_context;
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(*  Title:      Pure/Isar/isar_cmd.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Non-logical toplevel commands.
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*)
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signature ISAR_CMD =
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sig
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  val exit: Toplevel.transition -> Toplevel.transition
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  val quit: Toplevel.transition -> Toplevel.transition
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  val init_toplevel: Toplevel.transition -> Toplevel.transition
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  val touch_all_thys: Toplevel.transition -> Toplevel.transition
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  val touch_thy: string -> Toplevel.transition -> Toplevel.transition
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  val remove_thy: string -> Toplevel.transition -> Toplevel.transition
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  val kill_theory: Toplevel.transition -> Toplevel.transition
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  val cannot_undo: string -> Toplevel.transition -> Toplevel.transition
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  val clear_undo: Toplevel.transition -> Toplevel.transition
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  val redo: Toplevel.transition -> Toplevel.transition
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  val undos_proof: int -> Toplevel.transition -> Toplevel.transition
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  val kill_proof: Toplevel.transition -> Toplevel.transition
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  val undo_theory: Toplevel.transition -> Toplevel.transition
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  val undo: Toplevel.transition -> Toplevel.transition
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  val use: string -> Toplevel.transition -> Toplevel.transition
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  val use_mltext_theory: string -> Toplevel.transition -> Toplevel.transition
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  val use_mltext: string -> Toplevel.transition -> Toplevel.transition
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  val use_commit: Toplevel.transition -> Toplevel.transition
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  val cd: string -> Toplevel.transition -> Toplevel.transition
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  val pwd: Toplevel.transition -> Toplevel.transition
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  val use_thy: string -> Toplevel.transition -> Toplevel.transition
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  val use_thy_only: string -> Toplevel.transition -> Toplevel.transition
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  val update_thy: string -> Toplevel.transition -> Toplevel.transition
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  val update_thy_only: string -> Toplevel.transition -> Toplevel.transition
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  val pretty_setmargin: int -> Toplevel.transition -> Toplevel.transition
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  val print_context: Toplevel.transition -> Toplevel.transition
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  val print_theory: Toplevel.transition -> Toplevel.transition
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  val print_syntax: Toplevel.transition -> Toplevel.transition
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  val print_theorems: Toplevel.transition -> Toplevel.transition
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  val print_attributes: Toplevel.transition -> Toplevel.transition
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  val print_methods: Toplevel.transition -> Toplevel.transition
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  val print_binds: Toplevel.transition -> Toplevel.transition
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  val print_lthms: Toplevel.transition -> Toplevel.transition
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  val print_thms: (string * Args.src list) list -> Toplevel.transition -> Toplevel.transition
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  val print_prop: string -> Toplevel.transition -> Toplevel.transition
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  val print_term: string -> Toplevel.transition -> Toplevel.transition
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  val print_type: string -> Toplevel.transition -> Toplevel.transition
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end;
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structure IsarCmd: ISAR_CMD =
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struct
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(* variations on exit *)
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val exit = Toplevel.keep (fn state =>
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  (Context.set_context (try Toplevel.theory_of state);
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    writeln "Leaving the Isar loop.  Invoke 'loop();' to restart.";
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    raise Toplevel.TERMINATE));
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val quit = Toplevel.imperative quit;
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val init_toplevel = Toplevel.imperative (fn () => raise Toplevel.RESTART);
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(* touch theories *)
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val touch_all_thys = Toplevel.imperative ThyInfo.touch_all_thys;
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fun touch_thy name = Toplevel.imperative (fn () => ThyInfo.touch_thy name);
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fun remove_thy name = Toplevel.imperative (fn () => ThyInfo.remove_thy name);
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val kill_theory = Toplevel.imperative (fn () => warning "Nothing to kill.") o Toplevel.kill;
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(* history commands *)
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fun cannot_undo txt = Toplevel.imperative (fn () => error ("Cannot undo " ^ quote txt));
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val clear_undo = Toplevel.history History.clear o Toplevel.proof ProofHistory.clear;
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val redo = Toplevel.history History.redo o Toplevel.proof ProofHistory.redo;
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fun undos_proof n = Toplevel.proof (fn prf =>
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  if ProofHistory.is_initial prf then raise Toplevel.UNDEF else funpow n ProofHistory.undo prf);
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val kill_proof = Toplevel.history (fn hist =>
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  (case History.current hist of
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    Toplevel.Theory _ => raise Toplevel.UNDEF
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  | Toplevel.Proof _ => History.undo hist));
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val undo_theory = Toplevel.history (fn hist =>
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  if History.is_initial hist then raise Toplevel.UNDEF else History.undo hist);
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val undo = kill_theory o undo_theory o undos_proof 1;
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(* use ML text *)
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fun use name = Toplevel.keep (fn state =>
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  Context.setmp (try Toplevel.theory_of state) ThyInfo.use name);
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(*passes changes of theory context*)
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val use_mltext_theory = Toplevel.theory o IsarThy.use_mltext_theory;
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(*ignore result theory context*)
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fun use_mltext txt = Toplevel.keep (fn state =>
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  (IsarThy.use_mltext txt (try Toplevel.theory_of state); ()));
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(*Note: commit is dynamically bound*)
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val use_commit = use_mltext "commit();";
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(* current working directory *)
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fun print_cd _ = writeln (Path.pack (File.pwd ()));
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fun cd dir = Toplevel.imperative (fn () => (File.cd (Path.unpack dir); print_cd ()));
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val pwd = Toplevel.imperative print_cd;
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(* load theory files *)
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fun use_thy name = Toplevel.imperative (fn () => Context.save ThyInfo.use_thy name);
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fun use_thy_only name = Toplevel.imperative (fn () => Context.save ThyInfo.use_thy_only name);
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fun update_thy name = Toplevel.imperative (fn () => Context.save ThyInfo.update_thy name);
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fun update_thy_only name =
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  Toplevel.imperative (fn () => Context.save ThyInfo.update_thy_only name);
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(* pretty_setmargin *)
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fun pretty_setmargin n = Toplevel.imperative (fn () => Pretty.setmargin n);
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(* print theory *)
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val print_context = Toplevel.keep Toplevel.print_state_context;
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val print_theory = Toplevel.keep (PureThy.print_theory o Toplevel.theory_of);
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val print_syntax = Toplevel.keep (Display.print_syntax o Toplevel.theory_of);
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val print_theorems = Toplevel.keep (PureThy.print_theorems o Toplevel.theory_of);
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val print_attributes = Toplevel.keep (Attrib.print_attributes o Toplevel.theory_of);
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val print_methods = Toplevel.keep (Method.print_methods o Toplevel.theory_of);
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(* print proof context contents *)
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val print_binds = Toplevel.keep (ProofContext.print_binds o Proof.context_of o Toplevel.proof_of);
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val print_lthms = Toplevel.keep (ProofContext.print_thms o Proof.context_of o Toplevel.proof_of);
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(* print theorems / types / terms / props *)
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fun print_thms args = Toplevel.keep (fn state =>
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  let val st = Toplevel.node_case Proof.init_state Proof.enter_forward state
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  in Display.print_thms (IsarThy.get_thmss args st) end);
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fun read_typ thy = Sign.read_typ (Theory.sign_of thy, K None);
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fun read_term T thy s =
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  Thm.term_of (#1 (Thm.read_def_cterm (Theory.sign_of thy, K None, K None) [] true (s, T)));
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fun print_type s = Toplevel.keep (fn state =>
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  let
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    val sign = Toplevel.sign_of state;
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    val T = Toplevel.node_case read_typ (ProofContext.read_typ o Proof.context_of) state s;
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  in Pretty.writeln (Pretty.quote (Sign.pretty_typ sign T)) end);
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fun print_term s = Toplevel.keep (fn state =>
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  let
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    val sign = Toplevel.sign_of state;
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    val t = Toplevel.node_case (read_term (TVar (("'z", 0), logicS)))
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      (ProofContext.read_term o Proof.context_of) state s;
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    val T = Term.type_of t;
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  in
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    Pretty.writeln (Pretty.block [Pretty.quote (Sign.pretty_term sign t), Pretty.fbrk,
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      Pretty.str "::", Pretty.brk 1, Pretty.quote (Sign.pretty_typ sign T)])
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  end);
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fun print_prop s = Toplevel.keep (fn state =>
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  let
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    val sign = Toplevel.sign_of state;
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    val prop =
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      Toplevel.node_case (read_term propT) (ProofContext.read_prop o Proof.context_of) state s;
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  in Pretty.writeln (Pretty.quote (Sign.pretty_term sign prop)) end);
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end;