src/Pure/Isar/local_theory.ML
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Sat, 24 Jul 2010 12:14:53 +0200
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permissions -rw-r--r--
moved management of auxiliary theory source files to Thy_Load -- as theory data instead of accidental loader state; theory loader: reduced warnings -- thy database can be bypassed in certain situations; Proof/Local_Theory.propagate_ml_env; ML use function: propagate ML environment as well; pervasive type generic_theory;
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(*  Title:      Pure/Isar/local_theory.ML
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    Author:     Makarius
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Local theory operations, with abstract target context.
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*)
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type local_theory = Proof.context;
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type generic_theory = Context.generic;
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signature LOCAL_THEORY =
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sig
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  type operations
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  val affirm: local_theory -> local_theory
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  val naming_of: local_theory -> Name_Space.naming
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  val full_name: local_theory -> binding -> string
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  val map_naming: (Name_Space.naming -> Name_Space.naming) -> local_theory -> local_theory
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  val conceal: local_theory -> local_theory
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  val new_group: local_theory -> local_theory
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  val reset_group: local_theory -> local_theory
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  val restore_naming: local_theory -> local_theory -> local_theory
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  val target_of: local_theory -> Proof.context
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  val raw_theory_result: (theory -> 'a * theory) -> local_theory -> 'a * local_theory
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  val raw_theory: (theory -> theory) -> local_theory -> local_theory
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  val theory_result: (theory -> 'a * theory) -> local_theory -> 'a * local_theory
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  val theory: (theory -> theory) -> local_theory -> local_theory
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  val target_result: (Proof.context -> 'a * Proof.context) -> local_theory -> 'a * local_theory
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  val target: (Proof.context -> Proof.context) -> local_theory -> local_theory
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  val map_contexts: (Context.generic -> Context.generic) -> local_theory -> local_theory
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  val propagate_ml_env: generic_theory -> generic_theory
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  val standard_morphism: local_theory -> Proof.context -> morphism
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  val target_morphism: local_theory -> morphism
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  val global_morphism: local_theory -> morphism
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  val pretty: local_theory -> Pretty.T list
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  val abbrev: Syntax.mode -> (binding * mixfix) * term -> local_theory ->
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    (term * term) * local_theory
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  val define: (binding * mixfix) * (Attrib.binding * term) -> local_theory ->
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    (term * (string * thm)) * local_theory
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  val note: Attrib.binding * thm list -> local_theory -> (string * thm list) * local_theory
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  val notes: (Attrib.binding * (thm list * Attrib.src list) list) list ->
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    local_theory -> (string * thm list) list * local_theory
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  val notes_kind: string -> (Attrib.binding * (thm list * Attrib.src list) list) list ->
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    local_theory -> (string * thm list) list * local_theory
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  val declaration: bool -> declaration -> local_theory -> local_theory
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  val syntax_declaration: bool -> declaration -> local_theory -> local_theory
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  val set_defsort: sort -> 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 notation: bool -> Syntax.mode -> (term * mixfix) list -> local_theory -> local_theory
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  val class_alias: binding -> class -> local_theory -> local_theory
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  val type_alias: binding -> string -> local_theory -> local_theory
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  val const_alias: binding -> string -> local_theory -> local_theory
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  val init: serial option -> string -> operations -> Proof.context -> local_theory
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  val restore: local_theory -> local_theory
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  val reinit: local_theory -> local_theory
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  val exit: local_theory -> Proof.context
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  val exit_global: local_theory -> theory
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  val exit_result: (morphism -> 'a -> 'b) -> 'a * local_theory -> 'b * Proof.context
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  val exit_result_global: (morphism -> 'a -> 'b) -> 'a * local_theory -> 'b * theory
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end;
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structure Local_Theory: LOCAL_THEORY =
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struct
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(** local theory data **)
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(* type lthy *)
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type operations =
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 {pretty: local_theory -> Pretty.T list,
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  abbrev: Syntax.mode -> (binding * mixfix) * term -> local_theory ->
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    (term * term) * local_theory,
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  define: (binding * mixfix) * (Attrib.binding * term) -> local_theory ->
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    (term * (string * thm)) * local_theory,
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  notes: string ->
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    (Attrib.binding * (thm list * Attrib.src list) list) list ->
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    local_theory -> (string * thm list) list * local_theory,
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  declaration: bool -> declaration -> local_theory -> local_theory,
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  syntax_declaration: bool -> declaration -> local_theory -> local_theory,
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  reinit: local_theory -> local_theory,
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  exit: local_theory -> Proof.context};
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datatype lthy = LThy of
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 {naming: Name_Space.naming,
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  theory_prefix: string,
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  operations: operations,
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  target: Proof.context};
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fun make_lthy (naming, theory_prefix, operations, target) =
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  LThy {naming = naming, theory_prefix = theory_prefix,
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    operations = operations, target = target};
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(* context data *)
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structure Data = Proof_Data
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(
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  type T = lthy option;
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  fun init _ = NONE;
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);
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fun get_lthy lthy =
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  (case Data.get lthy of
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    NONE => error "No local theory context"
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  | SOME (LThy data) => data);
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fun map_lthy f lthy =
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  let val {naming, theory_prefix, operations, target} = get_lthy lthy
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  in Data.put (SOME (make_lthy (f (naming, theory_prefix, operations, target)))) lthy end;
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val affirm = tap get_lthy;
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(* naming *)
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val naming_of = #naming o get_lthy;
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val full_name = Name_Space.full_name o naming_of;
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fun map_naming f = map_lthy (fn (naming, theory_prefix, operations, target) =>
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  (f naming, theory_prefix, operations, target));
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val conceal = map_naming Name_Space.conceal;
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val new_group = map_naming Name_Space.new_group;
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val reset_group = map_naming Name_Space.reset_group;
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val restore_naming = map_naming o K o naming_of;
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(* target *)
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val target_of = #target o get_lthy;
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fun map_target f = map_lthy (fn (naming, theory_prefix, operations, target) =>
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  (naming, theory_prefix, operations, f target));
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(* substructure mappings *)
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fun raw_theory_result f lthy =
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  let
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    val (res, thy') = f (ProofContext.theory_of lthy);
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    val lthy' = lthy
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      |> map_target (ProofContext.transfer thy')
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      |> ProofContext.transfer thy';
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  in (res, lthy') end;
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fun raw_theory f = #2 o raw_theory_result (f #> pair ());
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val checkpoint = raw_theory Theory.checkpoint;
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fun theory_result f lthy =
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  lthy |> raw_theory_result (fn thy =>
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    thy
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    |> Sign.map_naming (K (naming_of lthy))
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    |> f
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    ||> Sign.restore_naming thy
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    ||> Theory.checkpoint);
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fun theory f = #2 o theory_result (f #> pair ());
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fun target_result f lthy =
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  let
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    val (res, ctxt') = target_of lthy
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      |> Context_Position.set_visible false
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      |> f
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      ||> Context_Position.restore_visible lthy;
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    val thy' = ProofContext.theory_of ctxt';
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    val lthy' = lthy
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      |> map_target (K ctxt')
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      |> ProofContext.transfer thy';
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  in (res, lthy') end;
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fun target f = #2 o target_result (f #> pair ());
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fun map_contexts f =
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  theory (Context.theory_map f) #>
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  target (Context.proof_map f) #>
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  Context.proof_map f;
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fun propagate_ml_env (context as Context.Proof lthy) =
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      Context.Proof (map_contexts (ML_Env.inherit context) lthy)
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  | propagate_ml_env context = context;
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(* morphisms *)
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fun standard_morphism lthy ctxt =
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  ProofContext.norm_export_morphism lthy ctxt $>
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  Morphism.binding_morphism (Name_Space.transform_binding (naming_of lthy));
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fun target_morphism lthy = standard_morphism lthy (target_of lthy);
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fun global_morphism lthy =
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  standard_morphism lthy (ProofContext.init_global (ProofContext.theory_of lthy));
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(* primitive operations *)
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fun operation f lthy = f (#operations (get_lthy lthy)) lthy;
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fun operation1 f x = operation (fn ops => f ops x);
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fun operation2 f x y lthy = operation (fn ops => f ops x y) lthy;
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val pretty = operation #pretty;
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val abbrev = apsnd checkpoint ooo operation2 #abbrev;
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val define = apsnd checkpoint oo operation1 #define;
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val notes_kind = apsnd checkpoint ooo operation2 #notes;
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val declaration = checkpoint ooo operation2 #declaration;
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val syntax_declaration = checkpoint ooo operation2 #syntax_declaration;
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(** basic derived operations **)
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val notes = notes_kind "";
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fun note (a, ths) = notes [(a, [(ths, [])])] #>> the_single;
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fun set_defsort S =
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  syntax_declaration false (K (Context.mapping (Sign.set_defsort S) (ProofContext.set_defsort S)));
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(* notation *)
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fun type_notation add mode raw_args lthy =
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  let val args = map (apfst (Morphism.typ (target_morphism lthy))) raw_args
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  in syntax_declaration false (ProofContext.target_type_notation add mode args) lthy end;
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fun notation add mode raw_args lthy =
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  let val args = map (apfst (Morphism.term (target_morphism lthy))) raw_args
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  in syntax_declaration false (ProofContext.target_notation add mode args) lthy end;
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(* name space aliases *)
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fun alias global_alias local_alias b name =
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  syntax_declaration false (fn phi =>
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    let val b' = Morphism.binding phi b
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    in Context.mapping (global_alias b' name) (local_alias b' name) end)
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  #> local_alias b name;
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val class_alias = alias Sign.class_alias ProofContext.class_alias;
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val type_alias = alias Sign.type_alias ProofContext.type_alias;
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val const_alias = alias Sign.const_alias ProofContext.const_alias;
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(** init and exit **)
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(* init *)
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fun init group theory_prefix operations target =
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  let val naming =
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    Sign.naming_of (ProofContext.theory_of target)
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    |> Name_Space.set_group group
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    |> Name_Space.mandatory_path theory_prefix;
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  in
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    target |> Data.map
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      (fn NONE => SOME (make_lthy (naming, theory_prefix, operations, target))
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        | SOME _ => error "Local theory already initialized")
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    |> checkpoint
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  end;
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fun restore lthy =
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  let val {naming, theory_prefix, operations, target} = get_lthy lthy
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  in init (Name_Space.get_group naming) theory_prefix operations target end;
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val reinit = checkpoint o operation #reinit;
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(* exit *)
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val exit = ProofContext.theory Theory.checkpoint o operation #exit;
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val exit_global = ProofContext.theory_of o exit;
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fun exit_result f (x, lthy) =
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  let
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    val ctxt = exit lthy;
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    val phi = standard_morphism lthy ctxt;
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  in (f phi x, ctxt) end;
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fun exit_result_global f (x, lthy) =
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  let
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    val thy = exit_global lthy;
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    val thy_ctxt = ProofContext.init_global thy;
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    val phi = standard_morphism lthy thy_ctxt;
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  in (f phi x, thy) end;
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end;