src/Pure/PIDE/resources.ML
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(*  Title:      Pure/PIDE/resources.ML
42002
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    Author:     Makarius
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Resources for theories and auxiliary files.
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*)
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signature RESOURCES =
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sig
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  val default_qualifier: string
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  val init_session_base:
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    {global_theories: (string * string) list,
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     loaded_theories: string list,
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     known_theories: (string * string) list} -> unit
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  val finish_session_base: unit -> unit
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  val global_theory: string -> string option
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  val loaded_theory: string -> bool
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  val known_theory: string -> Path.T option
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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 begin_theory: Path.T -> Thy_Header.header -> theory list -> theory
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  val thy_path: Path.T -> Path.T
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  val theory_qualifier: string -> string
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  val import_name: string -> Path.T -> string -> {master_dir: Path.T, theory_name: string}
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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 parse_files: string -> (theory -> Token.file list) parser
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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 loaded_files_current: theory -> bool
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  val check_path: Proof.context -> Path.T -> string * Position.T -> Path.T
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  val check_file: Proof.context -> Path.T -> string * Position.T -> Path.T
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  val check_dir: Proof.context -> Path.T -> string * Position.T -> Path.T
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end;
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structure Resources: RESOURCES =
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struct
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(* session base *)
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val default_qualifier = "Draft";
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val empty_session_base =
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  {global_theories = Symtab.empty: string Symtab.table,
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   loaded_theories = Symtab.empty: unit Symtab.table,
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   known_theories = Symtab.empty: Path.T Symtab.table};
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val global_session_base =
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  Synchronized.var "Sessions.base" empty_session_base;
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fun init_session_base {global_theories, loaded_theories, known_theories} =
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  Synchronized.change global_session_base
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    (fn _ =>
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      {global_theories = Symtab.make global_theories,
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       loaded_theories = Symtab.make_set loaded_theories,
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       known_theories = Symtab.make (map (apsnd Path.explode) known_theories)});
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fun finish_session_base () =
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  Synchronized.change global_session_base
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    (fn {global_theories, loaded_theories, ...} =>
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      {global_theories = global_theories,
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       loaded_theories = loaded_theories,
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       known_theories = #known_theories empty_session_base});
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fun get_session_base f = f (Synchronized.value global_session_base);
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fun global_theory a = Symtab.lookup (get_session_base #global_theories) a;
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fun loaded_theory a = Symtab.defined (get_session_base #loaded_theories) a;
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fun known_theory a = Symtab.lookup (get_session_base #known_theories) a;
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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 begin_theory master_dir {name, imports, keywords} parents =
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  Theory.begin_theory name parents
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  |> map_files (fn _ => (master_dir, imports, []))
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  |> Thy_Header.add_keywords keywords;
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(* theory files *)
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val thy_path = Path.ext "thy";
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fun theory_qualifier theory =
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  (case global_theory theory of
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    SOME qualifier => qualifier
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  | NONE => Long_Name.qualifier theory);
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fun theory_name qualifier theory =
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  if Long_Name.is_qualified theory orelse is_some (global_theory theory)
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  then theory
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  else Long_Name.qualify qualifier theory;
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fun import_name qualifier dir s =
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  let val theory = theory_name qualifier (Thy_Header.import_name s) in
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    if loaded_theory theory then {master_dir = Path.current, theory_name = theory}
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    else
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      let
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        val node_name =
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          (case known_theory theory of
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            SOME node_name => node_name
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          | NONE =>
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              if Thy_Header.is_base_name s andalso Long_Name.is_qualified s
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              then Path.explode s
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              else File.full_path dir (thy_path (Path.expand (Path.explode s))));
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      in {master_dir = Path.dir node_name, theory_name = theory} end
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  end;
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fun check_file dir file = File.check_file (File.full_path dir file);
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fun check_thy dir thy_name =
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  let
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    val thy_base_name = Long_Name.base_name thy_name;
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    val master_file =
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      (case known_theory thy_name of
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        SOME known_path => check_file Path.current known_path
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      | NONE => check_file dir (thy_path (Path.basic thy_base_name)));
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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 _ =
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      thy_base_name <> name andalso
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        error ("Bad theory name " ^ quote name ^
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          " for file " ^ Path.print (Path.base master_file) ^ 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 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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      [] =>
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        let
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          val keywords = Thy_Header.get_keywords thy;
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          val master_dir = master_directory thy;
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          val pos = Token.pos_of tok;
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          val src_paths = Keyword.command_files keywords cmd (Path.explode name);
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        in map (Command.read_file master_dir pos) src_paths end
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    | files => map Exn.release 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, digest, ...} => provide (src_path, digest)) 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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(* antiquotations *)
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local
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fun gen_check check_file ctxt dir (name, pos) =
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  let
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    fun err msg = error (msg ^ Position.here pos);
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    val _ = Context_Position.report ctxt pos Markup.language_path;
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    val path = Path.append dir (Path.explode name) handle ERROR msg => err msg;
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    val _ = Path.expand path handle ERROR msg => err msg;
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    val _ = Context_Position.report ctxt pos (Markup.path (Path.smart_implode path));
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    val _ = check_file path handle ERROR msg => err msg;
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  in path end;
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fun document_antiq check ctxt (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 _ = check ctxt dir (name, pos);
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  in
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    space_explode "/" name
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    |> map Latex.output_ascii
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    |> space_implode (Latex.output_ascii "/" ^ "\\discretionary{}{}{}")
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    |> enclose "\\isatt{" "}"
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  end;
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fun ML_antiq check ctxt (name, pos) =
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  let val path = check ctxt Path.current (name, pos);
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  in "Path.explode " ^ ML_Syntax.print_string (Path.implode path) end;
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in
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val check_path = gen_check I;
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val check_file = gen_check File.check_file;
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val check_dir = gen_check File.check_dir;
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val _ = Theory.setup
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 (Thy_Output.antiquotation \<^binding>\<open>path\<close> (Scan.lift (Parse.position Parse.path))
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    (document_antiq check_path o #context) #>
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  Thy_Output.antiquotation \<^binding>\<open>file\<close> (Scan.lift (Parse.position Parse.path))
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    (document_antiq check_file o #context) #>
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  Thy_Output.antiquotation \<^binding>\<open>dir\<close> (Scan.lift (Parse.position Parse.path))
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    (document_antiq check_dir o #context) #>
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  ML_Antiquotation.value \<^binding>\<open>path\<close>
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    (Args.context -- Scan.lift (Parse.position Parse.path) >> uncurry (ML_antiq check_path)) #>
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  ML_Antiquotation.value \<^binding>\<open>file\<close>
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    (Args.context -- Scan.lift (Parse.position Parse.path) >> uncurry (ML_antiq check_file)) #>
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  ML_Antiquotation.value \<^binding>\<open>dir\<close>
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    (Args.context -- Scan.lift (Parse.position Parse.path) >> uncurry (ML_antiq check_dir)));
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end;
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end;