src/Pure/Thy/thy_load.ML
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defer actual parsing of command spans and thus allow new commands to be used in the same theory where defined;
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(*  Title:      Pure/Thy/thy_load.ML
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    Author:     Makarius
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Loading files that contribute to a theory.  Global master path.
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*)
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signature THY_LOAD =
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sig
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  val master_directory: theory -> Path.T
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  val imports_of: theory -> string list
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  val provide: Path.T * (Path.T * SHA1.digest) -> theory -> theory
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  val check_file: Path.T -> Path.T -> Path.T
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  val thy_path: Path.T -> Path.T
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  val check_thy: Path.T -> string ->
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    {master: Path.T * SHA1.digest, text: string, imports: string list, uses: (Path.T * bool) list}
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  val load_file: theory -> Path.T -> (Path.T * SHA1.digest) * string
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  val use_file: Path.T -> theory -> string * theory
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  val loaded_files: theory -> Path.T list
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  val all_current: theory -> bool
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  val use_ml: Path.T -> unit
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  val exec_ml: Path.T -> generic_theory -> generic_theory
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  val begin_theory: Path.T -> Thy_Header.header -> theory list -> theory
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  val load_thy: int -> Path.T -> Thy_Header.header -> Position.T -> string ->
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    theory list -> theory * unit future
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  val set_master_path: Path.T -> unit
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  val get_master_path: unit -> Path.T
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end;
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structure Thy_Load: THY_LOAD =
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struct
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(* manage source files *)
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type files =
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 {master_dir: Path.T,  (*master directory of theory source*)
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  imports: string list,  (*source specification of imports*)
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  required: Path.T list,  (*source path*)
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  provided: (Path.T * (Path.T * SHA1.digest)) list};  (*source path, physical path, digest*)
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fun make_files (master_dir, imports, required, provided): files =
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 {master_dir = master_dir, imports = imports, required = required, provided = provided};
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structure Files = Theory_Data
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(
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  type T = files;
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  val empty = make_files (Path.current, [], [], []);
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  fun extend _ = empty;
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  fun merge _ = empty;
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);
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fun map_files f =
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  Files.map (fn {master_dir, imports, required, provided} =>
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    make_files (f (master_dir, imports, required, provided)));
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val master_directory = #master_dir o Files.get;
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val imports_of = #imports o Files.get;
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fun put_deps dir imports = map_files (fn _ => (dir, imports, [], []));
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fun require src_path =
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  map_files (fn (master_dir, imports, required, provided) =>
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    if member (op =) required src_path then
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      error ("Duplicate source file dependency: " ^ Path.print src_path)
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    else (master_dir, imports, src_path :: required, provided));
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fun provide (src_path, path_id) =
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  map_files (fn (master_dir, imports, required, provided) =>
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    if AList.defined (op =) provided src_path then
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      error ("Duplicate resolution of source file dependency: " ^ Path.print src_path)
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    else (master_dir, imports, required, (src_path, path_id) :: provided));
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(* check files *)
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fun check_file dir file = File.check_file (File.full_path dir file);
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val thy_path = Path.ext "thy";
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fun check_thy dir name =
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  let
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    val path = thy_path (Path.basic name);
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    val master_file = check_file dir path;
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    val text = File.read master_file;
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    val (name', imports, uses) =
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      if name = Context.PureN then (Context.PureN, [], [])
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      else
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        let val {name, imports, uses, ...} = Thy_Header.read (Path.position master_file) text
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        in (name, imports, uses) end;
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    val _ = name <> name' andalso
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      error ("Bad file name " ^ Path.print path ^ " for theory " ^ quote name');
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  in {master = (master_file, SHA1.digest text), text = text, imports = imports, uses = uses} end;
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(* load files *)
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fun load_file thy src_path =
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  let
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    val full_path = check_file (master_directory thy) src_path;
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    val text = File.read full_path;
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    val id = SHA1.digest text;
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  in ((full_path, id), text) end;
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fun use_file src_path thy =
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  let
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    val (path_id, text) = load_file thy src_path;
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    val thy' = provide (src_path, path_id) thy;
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  in (text, thy') end;
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val loaded_files = map (#1 o #2) o #provided o Files.get;
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fun check_loaded thy =
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  let
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    val {required, provided, ...} = Files.get thy;
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    val provided_paths = map #1 provided;
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    val _ =
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      (case subtract (op =) provided_paths required of
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        [] => NONE
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      | bad => error ("Pending source file dependencies: " ^ commas (map Path.print (rev bad))));
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    val _ =
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      (case subtract (op =) required provided_paths of
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        [] => NONE
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      | bad => error ("Undeclared source file dependencies: " ^ commas (map Path.print (rev bad))));
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  in () end;
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fun all_current thy =
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  let
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    val {provided, ...} = Files.get thy;
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    fun current (src_path, (_, id)) =
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      (case try (load_file thy) src_path of
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        NONE => false
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      | SOME ((_, id'), _) => id = id');
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  in can check_loaded thy andalso forall current provided end;
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val _ = Context.>> (Context.map_theory (Theory.at_end (fn thy => (check_loaded thy; NONE))));
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(* provide files *)
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fun eval_file path text = ML_Context.eval_text true (Path.position path) text;
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fun use_ml src_path =
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  if is_none (Context.thread_data ()) then
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    let val path = check_file Path.current src_path
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    in eval_file path (File.read path) end
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  else
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    let
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      val thy = ML_Context.the_global_context ();
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      val ((path, id), text) = load_file thy src_path;
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      val _ = eval_file path text;
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      val _ = Context.>> Local_Theory.propagate_ml_env;
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      val provide = provide (src_path, (path, id));
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      val _ = Context.>> (Context.mapping provide (Local_Theory.background_theory provide));
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    in () end;
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fun exec_ml src_path = ML_Context.exec (fn () => use_ml src_path);
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(* load_thy *)
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fun begin_theory dir {name, imports, keywords, uses} parents =
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  Theory.begin_theory name parents
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  |> put_deps dir imports
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  |> fold Thy_Header.declare_keyword keywords
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  |> fold (require o fst) uses
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  |> fold (fn (path, true) => Context.theory_map (exec_ml path) o Theory.checkpoint | _ => I) uses
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  |> Theory.checkpoint;
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fun excursion init elements =
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  let
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    val immediate = not (Goal.future_enabled ());
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    fun proof_result (tr, trs) (st, _) =
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      let
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        val (result, st') = Toplevel.proof_result immediate (tr, trs) st;
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        val pos' = Toplevel.pos_of (List.last (tr :: trs));
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      in (result, (st', pos')) end;
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    fun element_result elem x =
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      fold_map proof_result
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        (Outer_Syntax.read_element (#2 (Outer_Syntax.get_syntax ())) init elem) x;
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    val (results, (end_state, end_pos)) =
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      fold_map element_result elements (Toplevel.toplevel, Position.none);
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    val thy = Toplevel.end_theory end_pos end_state;
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  in (flat results, thy) end;
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fun load_thy update_time dir header pos text parents =
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  let
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    val time = ! Toplevel.timing;
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    val {name, imports, uses, ...} = header;
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    val _ = Thy_Header.define_keywords header;
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    val _ = Present.init_theory name;
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    fun init () =
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      begin_theory dir header parents
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      |> Present.begin_theory update_time dir uses;
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    val lexs = Keyword.get_lexicons ();
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    val toks = Thy_Syntax.parse_tokens lexs pos text;
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    val spans = Thy_Syntax.parse_spans toks;
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    val elements = Thy_Syntax.parse_elements spans;
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    val _ = Present.theory_source name
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      (fn () => HTML.html_mode (implode o map Thy_Syntax.present_span) spans);
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    val _ = if time then writeln ("\n**** Starting theory " ^ quote name ^ " ****") else ();
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    val (results, thy) = cond_timeit time "" (fn () => excursion init elements);
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    val _ = if time then writeln ("**** Finished theory " ^ quote name ^ " ****\n") else ();
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    val present =
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      singleton (Future.cond_forks {name = "Outer_Syntax.present:" ^ name, group = NONE,
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        deps = map Future.task_of results, pri = 0, interrupts = true})
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      (fn () =>
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        let val ((minor, _), outer_syntax) = Outer_Syntax.get_syntax () in
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          Thy_Output.present_thy minor Keyword.command_tags
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            (Outer_Syntax.is_markup outer_syntax)
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            (maps Future.join results) toks
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          |> Buffer.content
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          |> Present.theory_output name
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        end);
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  in (thy, present) end;
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(* global master path *)
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local
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  val master_path = Unsynchronized.ref Path.current;
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in
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fun set_master_path path = master_path := path;
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fun get_master_path () = ! master_path;
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end;
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end;