src/Pure/Thy/thy_load.ML
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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.
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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 * Position.T) list
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  val thy_path: Path.T -> Path.T
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  val read_files: Path.T -> string -> Path.T * Position.T -> Token.file list
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  val parse_files: string -> (theory -> Token.file list) parser
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  val check_thy: Path.T -> string ->
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   {master: Path.T * SHA1.digest, text: string, theory_pos: Position.T,
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    imports: (string * Position.T) list, keywords: Thy_Header.keywords}
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  val provide: Path.T * SHA1.digest -> theory -> theory
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  val provide_parse_files: string -> (theory -> Token.file list * theory) parser
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  val load_file: theory -> Path.T -> (Path.T * SHA1.digest) * string
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  val loaded_files: theory -> Path.T list
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  val loaded_files_current: theory -> bool
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  val begin_theory: Path.T -> Thy_Header.header -> theory list -> theory
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  val load_thy: bool -> (Toplevel.transition -> Time.time option) -> int -> Path.T ->
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    Thy_Header.header -> Position.T -> string -> theory list -> theory * (unit -> unit) * int
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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 * Position.T) list,  (*source specification of imports*)
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  provided: (Path.T * SHA1.digest) list};  (*source path, digest*)
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fun make_files (master_dir, imports, provided): files =
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 {master_dir = master_dir, imports = imports, 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, provided} =>
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    make_files (f (master_dir, imports, 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 master_dir imports = map_files (fn _ => (master_dir, imports, []));
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(* auxiliary files *)
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fun check_file dir file = File.check_file (File.full_path dir file);
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fun read_files dir cmd (path, pos) =
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  let
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    fun make_file file =
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      let
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        val _ = Position.report pos (Markup.path (Path.implode file));
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        val full_path = check_file dir file;
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      in {src_path = file, text = File.read full_path, pos = Path.position full_path} end;
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    val paths =
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      (case Keyword.command_files cmd of
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        [] => [path]
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      | exts => map (fn ext => Path.ext ext path) exts);
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  in map make_file paths end;
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fun parse_files cmd =
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  Scan.ahead Parse.not_eof -- Parse.path >> (fn (tok, name) => fn thy =>
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    (case Token.get_files tok of
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      SOME files => files
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    | NONE => read_files (master_directory thy) cmd (Path.explode name, Token.position_of tok)));
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(* theory files *)
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val thy_path = Path.ext "thy";
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fun check_thy dir thy_name =
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  let
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    val path = thy_path (Path.basic thy_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 = (name, pos), imports, keywords} =
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      Thy_Header.read (Path.position master_file) text;
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    val _ = thy_name <> name andalso
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      error ("Bad file name " ^ Path.print path ^ " for theory " ^ quote name ^ Position.here pos);
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  in
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   {master = (master_file, SHA1.digest text), text = text, theory_pos = pos,
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    imports = imports, keywords = keywords}
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  end;
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(* load files *)
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fun provide (src_path, id) =
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  map_files (fn (master_dir, imports, provided) =>
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    if AList.defined (op =) provided src_path then
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      error ("Duplicate use of source file: " ^ Path.print src_path)
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    else (master_dir, imports, (src_path, id) :: provided));
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fun provide_parse_files cmd =
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  parse_files cmd >> (fn files => fn thy =>
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    let
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      val fs = files thy;
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      val thy' = fold (fn {src_path, text, ...} => provide (src_path, SHA1.digest text)) fs thy;
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    in (fs, thy') end);
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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 loaded_files_current thy =
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  #provided (Files.get thy) |>
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    forall (fn (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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(*Proof General legacy*)
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fun loaded_files thy =
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  let val {master_dir, provided, ...} = Files.get thy
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  in map (File.full_path master_dir o #1) provided end;
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(* load_thy *)
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fun begin_theory master_dir {name, imports, keywords} parents =
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  Theory.begin_theory name parents
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  |> put_deps master_dir imports
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  |> fold Thy_Header.declare_keyword keywords;
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fun excursion last_timing init elements =
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  let
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    fun prepare_span span =
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      Thy_Syntax.span_content span
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      |> Command.read init
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      |> (fn tr => Toplevel.put_timing (last_timing tr) tr);
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    fun element_result span_elem (st, _) =
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      let
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        val elem = Thy_Syntax.map_element prepare_span span_elem;
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        val (results, st') = Toplevel.element_result elem st;
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        val pos' = Toplevel.pos_of (Thy_Syntax.last_element elem);
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      in (results, (st', pos')) end;
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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 (results, thy) end;
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fun load_thy document last_timing update_time master_dir header text_pos text parents =
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  let
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    val time = ! Toplevel.timing;
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    val {name = (name, _), ...} = header;
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    val _ = Thy_Header.define_keywords header;
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    val lexs = Keyword.get_lexicons ();
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    val toks = Thy_Syntax.parse_tokens lexs text_pos text;
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    val spans = map (Thy_Syntax.resolve_files (read_files master_dir)) (Thy_Syntax.parse_spans toks);
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    val elements = Thy_Syntax.parse_elements spans;
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    fun init () =
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      begin_theory master_dir header parents
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      |> Present.begin_theory update_time
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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 last_timing init elements);
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    val _ = if time then writeln ("**** Finished theory " ^ quote name ^ " ****\n") else ();
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    fun present () =
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      let
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        val res = filter_out (Toplevel.is_ignored o #1) (maps Toplevel.join_results results);
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        val ((minor, _), outer_syntax) = Outer_Syntax.get_syntax ();
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      in
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        if exists (Toplevel.is_skipped_proof o #2) res then
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          warning ("Cannot present theory with skipped proofs: " ^ quote name)
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        else
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          let val tex_source =
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            Thy_Output.present_thy minor Keyword.command_tags
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              (Outer_Syntax.is_markup outer_syntax) res toks
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            |> Buffer.content;
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          in if document then Present.theory_output name tex_source else () end
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      end;
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  in (thy, present, size text) end;
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42002
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(* document antiquotation *)
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val _ = Theory.setup
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  (Thy_Output.antiquotation (Binding.name "file") (Scan.lift (Parse.position Parse.path))
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    (fn {context = ctxt, ...} => fn (name, pos) =>
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      let
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        val dir = master_directory (Proof_Context.theory_of ctxt);
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        val path = Path.append dir (Path.explode name);
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        val _ =
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          if File.exists path then ()
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          else error ("Bad file: " ^ Path.print (Path.expand path) ^ Position.here pos);
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        val _ = Position.report pos (Markup.path name);
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      in
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        space_explode "/" name
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        |> map Thy_Output.verb_text
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        |> space_implode (Thy_Output.verb_text "/" ^ "\\discretionary{}{}{}")
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      end));
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end;