src/Tools/Code/code_eval.ML
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(*  Title:      Tools/Code/code_eval.ML
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    Author:     Florian Haftmann, TU Muenchen
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Runtime services building on code generation into implementation language SML.
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*)
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signature CODE_EVAL =
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sig
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  val target: string
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  val eval: string option -> string * (unit -> 'a) option Unsynchronized.ref
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    -> ((term -> term) -> 'a -> 'a) -> theory -> term -> string list -> 'a
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  val setup: theory -> theory
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end;
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structure Code_Eval : CODE_EVAL =
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struct
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(** generic **)
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val target = "Eval";
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fun evaluation_code thy module_name tycos consts =
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  let
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    val (consts', (naming, program)) = Code_Thingol.consts_program thy false consts;
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    val tycos' = map (the o Code_Thingol.lookup_tyco naming) tycos;
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    val (ml_code, target_names) = Code_Target.produce_code_for thy
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      target NONE (SOME module_name) [] naming program (consts' @ tycos');
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    val (consts'', tycos'') = chop (length consts') target_names;
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    val consts_map = map2 (fn const => fn NONE =>
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        error ("Constant " ^ (quote o Code.string_of_const thy) const
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          ^ "\nhas a user-defined serialization")
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      | SOME const'' => (const, const'')) consts consts''
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    val tycos_map = map2 (fn tyco => fn NONE =>
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        error ("Type " ^ (quote o Sign.extern_type thy) tyco
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          ^ "\nhas a user-defined serialization")
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      | SOME tyco'' => (tyco, tyco'')) tycos tycos'';
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  in (ml_code, (tycos_map, consts_map)) end;
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(** evaluation **)
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fun eval some_target reff postproc thy t args =
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  let
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    val ctxt = ProofContext.init_global thy;
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    fun evaluator naming program ((_, (_, ty)), t) deps =
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      let
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        val _ = if Code_Thingol.contains_dictvar t then
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          error "Term to be evaluated contains free dictionaries" else ();
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        val value_name = "Value.VALUE.value"
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        val program' = program
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          |> Graph.new_node (value_name,
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              Code_Thingol.Fun (Term.dummy_patternN, ((([], ty), [(([], t), (NONE, true))]), NONE)))
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          |> fold (curry Graph.add_edge value_name) deps;
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        val (value_code, [SOME value_name']) = Code_Target.produce_code_for thy
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          (the_default target some_target) NONE (SOME "") [] naming program [value_name];
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        val sml_code = "let\n" ^ value_code ^ "\nin " ^ Long_Name.base_name value_name'
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          ^ space_implode " " (map (enclose "(" ")") args) ^ " end";
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      in ML_Context.evaluate ctxt false reff sml_code end;
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  in Code_Thingol.dynamic_eval_value thy postproc evaluator t end;
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(** instrumentalization by antiquotation **)
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local
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structure Code_Antiq_Data = Proof_Data
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(
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  type T = (string list * string list) * (bool
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    * (string * ((string * string) list * (string * string) list)) lazy);
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  fun init _ = (([], []), (true, (Lazy.value ("", ([], [])))));
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);
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val is_first_occ = fst o snd o Code_Antiq_Data.get;
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fun register_code new_tycos new_consts ctxt =
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  let
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    val ((tycos, consts), _) = Code_Antiq_Data.get ctxt;
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    val tycos' = fold (insert (op =)) new_tycos tycos;
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    val consts' = fold (insert (op =)) new_consts consts;
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    val acc_code = Lazy.lazy (fn () =>
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      evaluation_code (ProofContext.theory_of ctxt) "Code" tycos' consts');
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  in Code_Antiq_Data.put ((tycos', consts'), (false, acc_code)) ctxt end;
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fun register_const const = register_code [] [const];
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fun register_datatype tyco constrs = register_code [tyco] constrs;
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fun print_const const all_struct_name tycos_map consts_map =
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  (Long_Name.append all_struct_name o the o AList.lookup (op =) consts_map) const;
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fun print_code is_first print_it ctxt =
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  let
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    val (_, (_, acc_code)) = Code_Antiq_Data.get ctxt;
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    val (ml_code, (tycos_map, consts_map)) = Lazy.force acc_code;
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    val ml_code = if is_first then ml_code
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      else "";
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    val all_struct_name = "Isabelle";
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  in (ml_code, print_it all_struct_name tycos_map consts_map) end;
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in
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fun ml_code_antiq raw_const background =
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  let
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    val const = Code.check_const (ProofContext.theory_of background) raw_const;
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    val is_first = is_first_occ background;
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    val background' = register_const const background;
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  in (print_code is_first (print_const const), background') end;
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end; (*local*)
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(** reflection support **)
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fun check_datatype thy tyco consts =
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  let
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    val constrs = (map (fst o fst) o snd o Code.get_type thy) tyco;
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    val missing_constrs = subtract (op =) consts constrs;
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    val _ = if null missing_constrs then []
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      else error ("Missing constructor(s) " ^ commas (map quote missing_constrs)
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        ^ " for datatype " ^ quote tyco);
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    val false_constrs = subtract (op =) constrs consts;
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    val _ = if null false_constrs then []
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      else error ("Non-constructor(s) " ^ commas (map quote false_constrs)
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        ^ " for datatype " ^ quote tyco);
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  in () end;
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fun add_eval_tyco (tyco, tyco') thy =
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  let
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    val k = Sign.arity_number thy tyco;
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    fun pr pr' fxy [] = tyco'
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      | pr pr' fxy [ty] =
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          Code_Printer.concat [pr' Code_Printer.BR ty, tyco']
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      | pr pr' fxy tys =
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          Code_Printer.concat [Code_Printer.enum "," "(" ")" (map (pr' Code_Printer.BR) tys), tyco']
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  in
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    thy
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    |> Code_Target.add_tyco_syntax target tyco (SOME (k, pr))
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  end;
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fun add_eval_constr (const, const') thy =
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  let
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    val k = Code.args_number thy const;
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    fun pr pr' fxy ts = Code_Printer.brackify fxy
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      (const' :: the_list (Code_Printer.tuplify pr' Code_Printer.BR (map fst ts)));
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  in
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    thy
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    |> Code_Target.add_const_syntax target const (SOME (Code_Printer.simple_const_syntax (k, pr)))
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  end;
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fun add_eval_const (const, const') = Code_Target.add_const_syntax target
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  const (SOME (Code_Printer.simple_const_syntax (0, (K o K o K) const')));
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fun process (code_body, (tyco_map, (constr_map, const_map))) module_name NONE thy =
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      let
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        val pr = Code_Printer.str o Long_Name.append module_name;
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      in
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        thy
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        |> Code_Target.add_reserved target module_name
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        |> Context.theory_map
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          (ML_Context.exec (fn () => ML_Context.eval_text true Position.none code_body))
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        |> fold (add_eval_tyco o apsnd pr) tyco_map
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        |> fold (add_eval_constr o apsnd pr) constr_map
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        |> fold (add_eval_const o apsnd pr) const_map
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      end
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  | process (code_body, _) _ (SOME file_name) thy =
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      let
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        val preamble =
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          "(* Generated from " ^ Path.implode (Thy_Header.thy_path (Context.theory_name thy))
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          ^ "; DO NOT EDIT! *)";
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        val _ = File.write (Path.explode file_name) (preamble ^ "\n\n" ^ code_body);
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      in
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        thy
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      end;
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fun gen_code_reflect prep_type prep_const raw_datatypes raw_functions module_name some_file thy  =
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  let
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    val datatypes = map (fn (raw_tyco, raw_cos) =>
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      (prep_type thy raw_tyco, map (prep_const thy) raw_cos)) raw_datatypes;
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    val _ = map (uncurry (check_datatype thy)) datatypes;
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    val tycos = map fst datatypes;
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    val constrs = maps snd datatypes;
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    val functions = map (prep_const thy) raw_functions;
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    val result = evaluation_code thy module_name tycos (constrs @ functions)
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      |> (apsnd o apsnd) (chop (length constrs));
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  in
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    thy
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    |> process result module_name some_file
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  end;
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val code_reflect = gen_code_reflect Code_Target.cert_tyco Code.check_const;
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val code_reflect_cmd = gen_code_reflect Code_Target.read_tyco Code.read_const;
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(** Isar setup **)
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val _ = ML_Context.add_antiq "code" (fn _ => Args.term >> ml_code_antiq);
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local
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val datatypesK = "datatypes";
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val functionsK = "functions";
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val fileK = "file";
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val andK = "and"
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val _ = List.app Keyword.keyword [datatypesK, functionsK];
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val parse_datatype =
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  Parse.name --| Parse.$$$ "=" -- (Parse.term ::: (Scan.repeat (Parse.$$$ "|" |-- Parse.term)));
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in
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val _ =
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  Outer_Syntax.command "code_reflect" "enrich runtime environment with generated code"
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    Keyword.thy_decl (Parse.name -- Scan.optional (Parse.$$$ datatypesK |-- (parse_datatype
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      ::: Scan.repeat (Parse.$$$ andK |-- parse_datatype))) []
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    -- Scan.optional (Parse.$$$ functionsK |-- Scan.repeat1 Parse.name) []
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    -- Scan.option (Parse.$$$ fileK |-- Parse.name)
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  >> (fn (((module_name, raw_datatypes), raw_functions), some_file) => Toplevel.theory
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    (code_reflect_cmd raw_datatypes raw_functions module_name some_file)));
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end; (*local*)
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val setup = Code_Target.extend_target (target, (Code_ML.target_SML, K I));
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end; (*struct*)