src/Pure/Isar/specification.ML
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(*  Title:      Pure/Isar/specification.ML
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    Author:     Makarius
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Derived local theory specifications --- with type-inference and
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toplevel polymorphism.
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*)
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signature SPECIFICATION =
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sig
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  val check_spec:
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    (binding * typ option * mixfix) list -> (Attrib.binding * term) list -> Proof.context ->
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    (((binding * typ) * mixfix) list * (Attrib.binding * term) list) * Proof.context
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  val read_spec:
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    (binding * string option * mixfix) list -> (Attrib.binding * string) list -> Proof.context ->
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    (((binding * typ) * mixfix) list * (Attrib.binding * term) list) * Proof.context
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  val check_free_spec:
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    (binding * typ option * mixfix) list -> (Attrib.binding * term) list -> Proof.context ->
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    (((binding * typ) * mixfix) list * (Attrib.binding * term) list) * Proof.context
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  val read_free_spec:
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    (binding * string option * mixfix) list -> (Attrib.binding * string) list -> Proof.context ->
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    (((binding * typ) * mixfix) list * (Attrib.binding * term) list) * Proof.context
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  val check_specification: (binding * typ option * mixfix) list ->
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    (Attrib.binding * term list) list -> Proof.context ->
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    (((binding * typ) * mixfix) list * (Attrib.binding * term list) list) * Proof.context
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  val read_specification: (binding * string option * mixfix) list ->
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    (Attrib.binding * string list) list -> Proof.context ->
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    (((binding * typ) * mixfix) list * (Attrib.binding * term list) list) * Proof.context
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  val axiomatization: (binding * typ option * mixfix) list ->
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    (Attrib.binding * term list) list -> theory ->
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    (term list * thm list list) * theory
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  val axiomatization_cmd: (binding * string option * mixfix) list ->
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    (Attrib.binding * string list) list -> theory ->
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    (term list * thm list list) * theory
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  val axiom: Attrib.binding * term -> theory -> thm * theory
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  val axiom_cmd: Attrib.binding * string -> theory -> thm * theory
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  val definition:
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    (binding * typ option * mixfix) option * (Attrib.binding * term) ->
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    local_theory -> (term * (string * thm)) * local_theory
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  val definition':
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    (binding * typ option * mixfix) option * (Attrib.binding * term) ->
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    bool -> local_theory -> (term * (string * thm)) * local_theory
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  val definition_cmd:
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    (binding * string option * mixfix) option * (Attrib.binding * string) ->
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    bool -> local_theory -> (term * (string * thm)) * local_theory
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  val abbreviation: Syntax.mode -> (binding * typ option * mixfix) option * term ->
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    bool -> local_theory -> local_theory
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  val abbreviation_cmd: Syntax.mode -> (binding * string option * mixfix) option * string ->
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    bool -> local_theory -> local_theory
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  val type_notation: bool -> Syntax.mode -> (typ * mixfix) list -> local_theory -> local_theory
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  val type_notation_cmd: bool -> Syntax.mode -> (string * mixfix) list -> local_theory -> local_theory
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  val notation: bool -> Syntax.mode -> (term * mixfix) list -> local_theory -> local_theory
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  val notation_cmd: bool -> Syntax.mode -> (string * mixfix) list -> local_theory -> local_theory
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  val theorems: string ->
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    (Attrib.binding * (thm list * Attrib.src list) list) list ->
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    (binding * typ option * mixfix) list ->
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    bool -> local_theory -> (string * thm list) list * local_theory
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  val theorems_cmd: string ->
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    (Attrib.binding * (Facts.ref * Attrib.src list) list) list ->
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    (binding * string option * mixfix) list ->
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    bool -> local_theory -> (string * thm list) list * local_theory
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  val theorem: string -> Method.text option ->
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    (thm list list -> local_theory -> local_theory) -> Attrib.binding ->
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    Element.context_i list -> Element.statement_i ->
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    bool -> local_theory -> Proof.state
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  val theorem_cmd: string -> Method.text option ->
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    (thm list list -> local_theory -> local_theory) -> Attrib.binding ->
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    Element.context list -> Element.statement ->
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    bool -> local_theory -> Proof.state
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  val schematic_theorem: string -> Method.text option ->
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    (thm list list -> local_theory -> local_theory) -> Attrib.binding ->
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    Element.context_i list -> Element.statement_i ->
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    bool -> local_theory -> Proof.state
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  val schematic_theorem_cmd: string -> Method.text option ->
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    (thm list list -> local_theory -> local_theory) -> Attrib.binding ->
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    Element.context list -> Element.statement ->
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    bool -> local_theory -> Proof.state
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  val add_theorem_hook: (bool -> Proof.state -> Proof.state) -> Context.generic -> Context.generic
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end;
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structure Specification: SPECIFICATION =
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struct
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(* prepare specification *)
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local
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fun close_forms ctxt i xs As =
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  let
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    val commons = map #1 xs;
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    val _ =
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      (case duplicates (op =) commons of [] => ()
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      | dups => error ("Duplicate local variables " ^ commas_quote dups));
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    val frees = rev (fold (Variable.add_free_names ctxt) As (rev commons));
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    val types = map (Type_Infer.param i o rpair []) (Name.invent Name.context Name.aT (length frees));
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    val uniform_typing = the o AList.lookup (op =) (frees ~~ types);
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    fun abs_body lev y (Abs (x, T, b)) = Abs (x, T, abs_body (lev + 1) y b)
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      | abs_body lev y (t $ u) = abs_body lev y t $ abs_body lev y u
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      | abs_body lev y (t as Free (x, T)) =
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          if x = y then Type.constraint (uniform_typing x) (Type.constraint T (Bound lev))
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          else t
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      | abs_body _ _ a = a;
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    fun close (y, U) B =
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      let val B' = abs_body 0 y (Term.incr_boundvars 1 B)
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      in if Term.is_dependent B' then Term.all dummyT $ Abs (y, U, B') else B end;
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    fun close_form A =
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      let
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        val occ_frees = rev (Variable.add_free_names ctxt A []);
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        val bounds = xs @ map (rpair dummyT) (subtract (op =) commons occ_frees);
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      in fold_rev close bounds A end;
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  in map close_form As end;
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fun prepare prep_vars parse_prop prep_att do_close raw_vars raw_specss ctxt =
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  let
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    val thy = Proof_Context.theory_of ctxt;
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    val (vars, vars_ctxt) = ctxt |> prep_vars raw_vars;
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    val (xs, params_ctxt) = vars_ctxt |> Proof_Context.add_fixes vars;
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    val Asss =
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      (map o map) snd raw_specss
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      |> (burrow o burrow) (Par_List.map_name "Specification.parse_prop" (parse_prop params_ctxt));
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    val names = Variable.names_of (params_ctxt |> (fold o fold o fold) Variable.declare_term Asss)
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      |> fold Name.declare xs;
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    val Asss' = #1 ((fold_map o fold_map o fold_map) Term.free_dummy_patterns Asss names);
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    val idx = (fold o fold o fold) Term.maxidx_term Asss' ~1 + 1;
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    val specs =
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      (if do_close then
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        #1 (fold_map
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            (fn Ass => fn i => (burrow (close_forms params_ctxt i []) Ass, i + 1)) Asss' idx)
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      else Asss')
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      |> flat |> burrow (Syntax.check_props params_ctxt);
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    val specs_ctxt = params_ctxt |> (fold o fold) Variable.declare_term specs;
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    val Ts = specs_ctxt |> fold_map Proof_Context.inferred_param xs |> fst;
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    val params = map2 (fn (b, _, mx) => fn T => ((b, T), mx)) vars Ts;
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    val name_atts = map (fn ((name, atts), _) => (name, map (prep_att thy) atts)) (flat raw_specss);
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  in ((params, name_atts ~~ specs), specs_ctxt) end;
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fun single_spec (a, prop) = [(a, [prop])];
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fun the_spec (a, [prop]) = (a, prop);
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fun prep_spec prep_vars parse_prop prep_att do_close vars specs =
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  prepare prep_vars parse_prop prep_att do_close
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    vars (map single_spec specs) #>> apsnd (map the_spec);
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in
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fun check_spec x = prep_spec Proof_Context.cert_vars (K I) (K I) true x;
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fun read_spec x = prep_spec Proof_Context.read_vars Syntax.parse_prop Attrib.intern_src true x;
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fun check_free_spec x = prep_spec Proof_Context.cert_vars (K I) (K I) false x;
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fun read_free_spec x = prep_spec Proof_Context.read_vars Syntax.parse_prop Attrib.intern_src false x;
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fun check_specification vars specs =
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  prepare Proof_Context.cert_vars (K I) (K I) true vars [specs];
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fun read_specification vars specs =
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  prepare Proof_Context.read_vars Syntax.parse_prop Attrib.intern_src true vars [specs];
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end;
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(* axiomatization -- within global theory *)
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fun gen_axioms prep raw_vars raw_specs thy =
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  let
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    val ((vars, specs), _) = prep raw_vars raw_specs (Proof_Context.init_global thy);
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    val xs = map (fn ((b, T), _) => (Variable.check_name b, T)) vars;
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    (*consts*)
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    val (consts, consts_thy) = thy |> fold_map Theory.specify_const vars;
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    val subst = Term.subst_atomic (map Free xs ~~ consts);
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    (*axioms*)
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    val (axioms, axioms_thy) = (specs, consts_thy) |-> fold_map (fn ((b, atts), props) =>
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        fold_map Thm.add_axiom_global
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          (map (apfst (fn a => Binding.map_name (K a) b))
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            (Global_Theory.name_multi (Variable.check_name b) (map subst props)))
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        #>> (fn ths => ((b, atts), [(map #2 ths, [])])));
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    (*facts*)
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    val (facts, facts_lthy) = axioms_thy
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      |> Named_Target.theory_init
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      |> Spec_Rules.add Spec_Rules.Unknown (consts, maps (maps #1 o #2) axioms)
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      |> Local_Theory.notes axioms;
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  in ((consts, map #2 facts), Local_Theory.exit_global facts_lthy) end;
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val axiomatization = gen_axioms check_specification;
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val axiomatization_cmd = gen_axioms read_specification;
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fun axiom (b, ax) = axiomatization [] [(b, [ax])] #>> (hd o hd o snd);
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fun axiom_cmd (b, ax) = axiomatization_cmd [] [(b, [ax])] #>> (hd o hd o snd);
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(* definition *)
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fun gen_def prep (raw_var, raw_spec) int lthy =
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  let
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    val (vars, [((raw_name, atts), prop)]) = fst (prep (the_list raw_var) [raw_spec] lthy);
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    val (((x, T), rhs), prove) = Local_Defs.derived_def lthy true prop;
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    val var as (b, _) =
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      (case vars of
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        [] => (Binding.name x, NoSyn)
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      | [((b, _), mx)] =>
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          let
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            val y = Variable.check_name b;
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            val _ = x = y orelse
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              error ("Head of definition " ^ quote x ^ " differs from declaration " ^ quote y ^
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                Position.str_of (Binding.pos_of b));
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          in (b, mx) end);
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    val name = Thm.def_binding_optional b raw_name;
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    val ((lhs, (_, raw_th)), lthy2) = lthy
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      |> Local_Theory.define (var, ((Binding.suffix_name "_raw" name, []), rhs));
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    val th = prove lthy2 raw_th;
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    val lthy3 = lthy2 |> Spec_Rules.add Spec_Rules.Equational ([lhs], [th]);
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    val ([(def_name, [th'])], lthy4) = lthy3
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      |> Local_Theory.notes_kind ""
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        [((name, Code.add_default_eqn_attrib :: atts), [([th], [])])];
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    val lhs' = Morphism.term (Local_Theory.target_morphism lthy4) lhs;
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    val _ = Proof_Display.print_consts int lthy4 (member (op =) (Term.add_frees lhs' [])) [(x, T)];
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  in ((lhs, (def_name, th')), lthy4) end;
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val definition' = gen_def check_free_spec;
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fun definition spec = definition' spec false;
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val definition_cmd = gen_def read_free_spec;
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(* abbreviation *)
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fun gen_abbrev prep mode (raw_var, raw_prop) int lthy =
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  let
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    val ((vars, [(_, prop)]), _) =
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      prep (the_list raw_var) [(Attrib.empty_binding, raw_prop)]
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        (lthy |> Proof_Context.set_mode Proof_Context.mode_abbrev);
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    val ((x, T), rhs) = Local_Defs.abs_def (#2 (Local_Defs.cert_def lthy prop));
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    val var =
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      (case vars of
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        [] => (Binding.name x, NoSyn)
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      | [((b, _), mx)] =>
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          let
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            val y = Variable.check_name b;
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            val _ = x = y orelse
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              error ("Head of abbreviation " ^ quote x ^ " differs from declaration " ^ quote y ^
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                Position.str_of (Binding.pos_of b));
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          in (b, mx) end);
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    val lthy' = lthy
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      |> Proof_Context.set_syntax_mode mode    (* FIXME ?!? *)
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      |> Local_Theory.abbrev mode (var, rhs) |> snd
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      |> Proof_Context.restore_syntax_mode lthy;
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    val _ = Proof_Display.print_consts int lthy' (K false) [(x, T)];
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  in lthy' end;
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val abbreviation = gen_abbrev check_free_spec;
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val abbreviation_cmd = gen_abbrev read_free_spec;
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(* notation *)
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local
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fun gen_type_notation prep_type add mode args lthy =
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  lthy |> Local_Theory.type_notation add mode (map (apfst (prep_type lthy)) args);
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fun gen_notation prep_const add mode args lthy =
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  lthy |> Local_Theory.notation add mode (map (apfst (prep_const lthy)) args);
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in
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val type_notation = gen_type_notation (K I);
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val type_notation_cmd = gen_type_notation (fn ctxt => Proof_Context.read_type_name ctxt false);
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val notation = gen_notation (K I);
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val notation_cmd = gen_notation (fn ctxt => Proof_Context.read_const ctxt false dummyT);
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end;
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(* fact statements *)
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local
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fun gen_theorems prep_fact prep_att prep_vars
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    kind raw_facts raw_fixes int lthy =
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  let
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    val attrib = prep_att (Proof_Context.theory_of lthy);
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    val facts = raw_facts |> map (fn ((name, atts), bs) =>
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      ((name, map attrib atts),
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        bs |> map (fn (b, more_atts) => (prep_fact lthy b, map attrib more_atts))));
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    val (_, ctxt') = lthy |> prep_vars raw_fixes |-> Proof_Context.add_fixes;
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    val facts' = facts
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      |> Attrib.partial_evaluation ctxt'
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      |> Element.facts_map (Element.transform_ctxt (Proof_Context.export_morphism ctxt' lthy));
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    val (res, lthy') = lthy |> Local_Theory.notes_kind kind facts';
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    val _ = Proof_Display.print_results int lthy' ((kind, ""), res);
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  in (res, lthy') end;
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in
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val theorems = gen_theorems (K I) (K I) Proof_Context.cert_vars;
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val theorems_cmd = gen_theorems Proof_Context.get_fact Attrib.intern_src Proof_Context.read_vars;
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end;
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(* complex goal statements *)
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local
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fun prep_statement prep_att prep_stmt elems concl ctxt =
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  (case concl of
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    Element.Shows shows =>
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      let
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        val (propp, elems_ctxt) = prep_stmt elems (map snd shows) ctxt;
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        val prems = Assumption.local_prems_of elems_ctxt ctxt;
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        val stmt = Attrib.map_specs (map prep_att) (map fst shows ~~ propp);
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        val goal_ctxt = (fold o fold) (Variable.auto_fixes o fst) propp elems_ctxt;
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      in (([], prems, stmt, NONE), goal_ctxt) end
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  | Element.Obtains obtains =>
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      let
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        val case_names = obtains |> map_index (fn (i, (b, _)) =>
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          if Binding.is_empty b then string_of_int (i + 1) else Variable.check_name b);
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        val constraints = obtains |> map (fn (_, (vars, _)) =>
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          Element.Constrains
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            (vars |> map_filter (fn (x, SOME T) => SOME (Variable.check_name x, T) | _ => NONE)));
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        val raw_propp = obtains |> map (fn (_, (_, props)) => map (rpair []) props);
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        val (propp, elems_ctxt) = prep_stmt (elems @ constraints) raw_propp ctxt;
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        val thesis = Object_Logic.fixed_judgment (Proof_Context.theory_of ctxt) Auto_Bind.thesisN;
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        fun assume_case ((name, (vars, _)), asms) ctxt' =
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          let
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            val bs = map fst vars;
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            val xs = map Variable.check_name bs;
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            val props = map fst asms;
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            val (Ts, _) = ctxt'
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              |> fold Variable.declare_term props
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              |> fold_map Proof_Context.inferred_param xs;
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            val asm = Term.list_all_free (xs ~~ Ts, Logic.list_implies (props, thesis));
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            val _ = ctxt' |> Proof_Context.add_fixes (map (fn b => (b, NONE, NoSyn)) bs);
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          in
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            ctxt'
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            |> Variable.auto_fixes asm
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            |> Proof_Context.add_assms_i Assumption.assume_export
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              [((name, [Context_Rules.intro_query NONE]), [(asm, [])])]
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            |>> (fn [(_, [th])] => th)
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          end;
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        val more_atts = map (Attrib.internal o K)
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          [Rule_Cases.consumes (~ (length obtains)), Rule_Cases.case_names case_names];
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        val prems = Assumption.local_prems_of elems_ctxt ctxt;
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        val stmt = [((Binding.empty, []), [(thesis, [])])];
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        val (facts, goal_ctxt) = elems_ctxt
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          |> (snd o Proof_Context.add_fixes [(Binding.name Auto_Bind.thesisN, NONE, NoSyn)])
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          |> fold_map assume_case (obtains ~~ propp)
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          |-> (fn ths =>
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            Proof_Context.note_thmss "" [((Binding.name Obtain.thatN, []), [(ths, [])])] #>
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            #2 #> pair ths);
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      in ((more_atts, prems, stmt, SOME facts), goal_ctxt) end);
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structure Theorem_Hook = Generic_Data
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(
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  type T = ((bool -> Proof.state -> Proof.state) * stamp) list;
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  val empty = [];
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  val extend = I;
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  fun merge data : T = Library.merge (eq_snd op =) data;
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);
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fun gen_theorem schematic prep_att prep_stmt
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    kind before_qed after_qed (name, raw_atts) raw_elems raw_concl int lthy =
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  let
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    val _ = Local_Theory.affirm lthy;
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    val thy = Proof_Context.theory_of lthy;
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    val attrib = prep_att thy;
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    val elems = raw_elems |> map (Element.map_ctxt_attrib attrib);
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    val ((more_atts, prems, stmt, facts), goal_ctxt) =
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      prep_statement attrib prep_stmt elems raw_concl lthy;
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    val atts = more_atts @ map attrib raw_atts;
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    fun after_qed' results goal_ctxt' =
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      let
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        val results' = burrow (map Goal.norm_result o Proof_Context.export goal_ctxt' lthy) results;
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        val (res, lthy') =
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          if forall (Attrib.is_empty_binding o fst) stmt then (map (pair "") results', lthy)
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          else
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            Local_Theory.notes_kind kind
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              (map2 (fn (b, _) => fn ths => (b, [(ths, [])])) stmt results') lthy;
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        val lthy'' =
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          if Attrib.is_empty_binding (name, atts) then
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            (Proof_Display.print_results int lthy' ((kind, ""), res); lthy')
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          else
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            let
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              val ([(res_name, _)], lthy'') =
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   405
                Local_Theory.notes_kind kind [((name, atts), [(maps #2 res, [])])] lthy';
44192
a32ca9165928 less verbosity in batch mode -- spam reduction and notable performance improvement;
wenzelm
parents: 43329
diff changeset
   406
              val _ = Proof_Display.print_results int lthy' ((kind, res_name), res);
45584
41a768a431a6 do not store vacuous theorem specifications -- relevant for frugal local theory content;
wenzelm
parents: 45583
diff changeset
   407
            in lthy'' end;
41a768a431a6 do not store vacuous theorem specifications -- relevant for frugal local theory content;
wenzelm
parents: 45583
diff changeset
   408
      in after_qed results' lthy'' end;
21036
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   409
  in
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   410
    goal_ctxt
42360
da8817d01e7c modernized structure Proof_Context;
wenzelm
parents: 42357
diff changeset
   411
    |> Proof_Context.note_thmss "" [((Binding.name Auto_Bind.assmsN, []), [(prems, [])])]
21450
f16c9e6401d1 theorem(_i): note assms of statement;
wenzelm
parents: 21435
diff changeset
   412
    |> snd
36323
655e2d74de3a modernized naming conventions of main Isar proof elements;
wenzelm
parents: 36317
diff changeset
   413
    |> Proof.theorem before_qed after_qed' (map snd stmt)
32856
92d9555ac790 clarified Proof.refine_insert -- always "refine" to apply standard method treatment (of conjunctions);
wenzelm
parents: 32786
diff changeset
   414
    |> (case facts of NONE => I | SOME ths => Proof.refine_insert ths)
36317
506d732cb522 explicit 'schematic_theorem' etc. for schematic theorem statements;
wenzelm
parents: 36106
diff changeset
   415
    |> tap (fn state => not schematic andalso Proof.schematic_goal state andalso
506d732cb522 explicit 'schematic_theorem' etc. for schematic theorem statements;
wenzelm
parents: 36106
diff changeset
   416
        error "Illegal schematic goal statement")
37216
3165bc303f66 modernized some structure names, keeping a few legacy aliases;
wenzelm
parents: 37145
diff changeset
   417
    |> Library.apply (map (fn (f, _) => f int) (rev (Theorem_Hook.get (Context.Proof goal_ctxt))))
21036
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   418
  end;
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   419
21230
abfdce60b371 theorem statements: incorporate Obtain.statement, tuned;
wenzelm
parents: 21206
diff changeset
   420
in
abfdce60b371 theorem statements: incorporate Obtain.statement, tuned;
wenzelm
parents: 21206
diff changeset
   421
44192
a32ca9165928 less verbosity in batch mode -- spam reduction and notable performance improvement;
wenzelm
parents: 43329
diff changeset
   422
val theorem' = gen_theorem false (K I) Expression.cert_statement;
a32ca9165928 less verbosity in batch mode -- spam reduction and notable performance improvement;
wenzelm
parents: 43329
diff changeset
   423
fun theorem a b c d e f = theorem' a b c d e f;
36317
506d732cb522 explicit 'schematic_theorem' etc. for schematic theorem statements;
wenzelm
parents: 36106
diff changeset
   424
val theorem_cmd = gen_theorem false Attrib.intern_src Expression.read_statement;
506d732cb522 explicit 'schematic_theorem' etc. for schematic theorem statements;
wenzelm
parents: 36106
diff changeset
   425
506d732cb522 explicit 'schematic_theorem' etc. for schematic theorem statements;
wenzelm
parents: 36106
diff changeset
   426
val schematic_theorem = gen_theorem true (K I) Expression.cert_statement;
506d732cb522 explicit 'schematic_theorem' etc. for schematic theorem statements;
wenzelm
parents: 36106
diff changeset
   427
val schematic_theorem_cmd = gen_theorem true Attrib.intern_src Expression.read_statement;
21036
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   428
37216
3165bc303f66 modernized some structure names, keeping a few legacy aliases;
wenzelm
parents: 37145
diff changeset
   429
fun add_theorem_hook f = Theorem_Hook.map (cons (f, stamp ()));
24452
93b113c5ac33 - theorem(_i) now also takes "interactive" flag as argument
berghofe
parents: 24219
diff changeset
   430
18620
fc8b5f275359 Theory specifications --- with type-inference, but no internal polymorphism.
wenzelm
parents:
diff changeset
   431
end;
21036
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   432
0eed532acfca added theorem(_i);
wenzelm
parents: 20914
diff changeset
   433
end;