src/Pure/Isar/local_theory.ML
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(*  Title:      Pure/Isar/local_theory.ML
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    ID:         $Id$
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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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signature LOCAL_THEORY =
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sig
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  type operations
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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 full_name: local_theory -> bstring -> string
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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 assert: local_theory -> local_theory
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  val pretty: local_theory -> Pretty.T list
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  val consts: (string * typ -> bool) ->
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    ((bstring * typ) * mixfix) list -> local_theory -> (term * thm) list * local_theory
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  val axioms: string -> ((bstring * Attrib.src list) * term list) list -> local_theory ->
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    (bstring * thm list) list * local_theory
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  val defs: string -> ((bstring * mixfix) * ((bstring * Attrib.src list) * term)) list ->
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    local_theory -> (term * (bstring * thm)) list * local_theory
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  val notes: string -> ((bstring * Attrib.src list) * (thm list * Attrib.src list) list) list ->
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    local_theory -> (bstring * thm list) list * local_theory
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  val type_syntax: (morphism -> Context.generic -> Context.generic) -> local_theory -> local_theory
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  val term_syntax: (morphism -> Context.generic -> Context.generic) -> local_theory -> local_theory
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  val declaration: (morphism -> Context.generic -> Context.generic) -> local_theory -> local_theory
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  val def: string -> (bstring * mixfix) * ((bstring * Attrib.src list) * term) ->
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    local_theory -> (term * (bstring * thm)) * local_theory
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  val note: string -> (bstring * Attrib.src list) * thm list ->
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    local_theory -> (bstring * thm list) * Proof.context
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  val notation: Syntax.mode -> (term * mixfix) list -> local_theory -> local_theory
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  val abbrevs: Syntax.mode -> ((bstring * mixfix) * term) list -> local_theory -> local_theory
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  val target_morphism: local_theory -> morphism
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  val target_name: local_theory -> bstring -> string
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  val init: string -> operations -> Proof.context -> local_theory
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  val restore: local_theory -> local_theory
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  val reinit: local_theory -> theory -> local_theory
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  val exit: local_theory -> Proof.context
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end;
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structure LocalTheory: 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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  consts: (string * typ -> bool) -> ((bstring * typ) * mixfix) list -> local_theory ->
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    (term * thm) list * local_theory,
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  axioms: string -> ((bstring * Attrib.src list) * term list) list -> local_theory ->
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    (bstring * thm list) list * local_theory,
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  defs: string -> ((bstring * mixfix) * ((bstring * Attrib.src list) * term)) list ->
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    local_theory -> (term * (bstring * thm)) list * local_theory,
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  notes: string ->
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    ((bstring * Attrib.src list) * (thm list * Attrib.src list) list) list ->
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    local_theory -> (bstring * thm list) list * local_theory,
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  type_syntax: (morphism -> Context.generic -> Context.generic) -> local_theory -> local_theory,
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  term_syntax: (morphism -> Context.generic -> Context.generic) -> local_theory -> local_theory,
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  declaration: (morphism -> Context.generic -> Context.generic) -> local_theory -> local_theory,
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  target_morphism: local_theory -> morphism,
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  target_name: local_theory -> bstring -> string,
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  reinit: local_theory -> theory -> local_theory,
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  exit: local_theory -> Proof.context};
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datatype lthy = LThy of
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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 (theory_prefix, operations, target) =
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  LThy {theory_prefix = theory_prefix, operations = operations, target = target};
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(* context data *)
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structure Data = ProofDataFun
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(
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  val name = "Pure/local_theory";
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  type T = lthy option;
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  fun init _ = NONE;
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  fun print _ _ = ();
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);
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val _ = Context.add_setup Data.init;
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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 {theory_prefix, operations, target} = get_lthy lthy
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  in Data.put (SOME (make_lthy (f (theory_prefix, operations, target)))) lthy end;
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val target_of = #target o get_lthy;
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val assert = tap target_of;
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fun map_target f = map_lthy (fn (theory_prefix, operations, target) =>
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  (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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fun full_name lthy =
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  let
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    val naming = Sign.naming_of (ProofContext.theory_of lthy)
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      |> NameSpace.sticky_prefix (#theory_prefix (get_lthy lthy))
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      |> NameSpace.qualified_names;
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  in NameSpace.full naming end;  
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fun theory_result f lthy = lthy |> raw_theory_result (fn thy => thy
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  |> Sign.sticky_prefix (#theory_prefix (get_lthy lthy))
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  |> Sign.qualified_names
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  |> f
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  ||> Sign.restore_naming thy);
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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') = f (#target (get_lthy 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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(* 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 = operation (fn ops => f ops x y);
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val pretty = operation #pretty;
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val consts = operation2 #consts;
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val axioms = operation2 #axioms;
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val defs = operation2 #defs;
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val notes = operation2 #notes;
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val type_syntax = operation1 #type_syntax;
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val term_syntax = operation1 #term_syntax;
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val declaration = operation1 #declaration;
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val target_morphism = operation #target_morphism;
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val target_name = operation #target_name;
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(* derived operations *)
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fun def kind arg lthy = lthy |> defs kind [arg] |>> hd;
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fun note kind (a, ths) lthy = lthy |> notes kind [(a, [(ths, [])])] |>> hd;
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fun notation mode args = term_syntax (fn phi =>
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  let val args' = args |> map (fn (t, mx) => (Morphism.term phi t, mx))
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  in Context.mapping (Sign.add_notation mode args') (ProofContext.add_notation mode args') end);
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fun abbrevs mode args = term_syntax (fn phi =>
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  let val args' = args |> map (fn ((c, mx), t) => ((Morphism.name phi c, mx), Morphism.term phi t))
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  in
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    Context.mapping
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      (snd o Sign.add_abbrevs mode args') (snd o ProofContext.add_abbrevs mode args')
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  end);
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(* init -- exit *)
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fun init theory_prefix operations target = target |> Data.map
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  (fn NONE => SOME (make_lthy (theory_prefix, operations, target))
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    | SOME _ => error "Local theory already initialized");
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fun restore lthy =
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  let val {theory_prefix, operations, target} = get_lthy lthy
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  in init theory_prefix operations target end;
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val reinit = operation #reinit;
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val exit = operation #exit;
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end;