src/Pure/Thy/present.ML
author wenzelm
Thu Jan 19 21:22:08 2006 +0100 (2006-01-19 ago)
changeset 18708 4b3dadb4fe33
parent 17934 ab08250b80df
child 19046 bc5c6c9b114e
permissions -rw-r--r--
setup: theory -> theory;
     1 (*  Title:      Pure/Thy/present.ML
     2     ID:         $Id$
     3     Author:     Markus Wenzel and Stefan Berghofer, TU Muenchen
     4 
     5 Theory presentation: HTML, graph files, (PDF)LaTeX documents.
     6 *)
     7 
     8 signature BASIC_PRESENT =
     9 sig
    10   val no_document: ('a -> 'b) -> 'a -> 'b
    11   val section: string -> unit
    12 end;
    13 
    14 signature PRESENT =
    15 sig
    16   include BASIC_PRESENT
    17   val get_info: theory -> {name: string, session: string list, is_local: bool}
    18   val write_graph: {name: string, ID: string, dir: string, unfold: bool,
    19    path: string, parents: string list} list -> Path.T -> unit
    20   val init: bool -> bool -> string -> bool -> string list -> string list ->
    21     string -> (bool * Path.T) option -> Url.T option * bool -> bool -> unit
    22   val finish: unit -> unit
    23   val init_theory: string -> unit
    24   val verbatim_source: string -> (unit -> Symbol.symbol list) -> unit
    25   val theory_output: string -> string -> unit
    26   val begin_theory: Path.T option -> string -> string list ->
    27     (Path.T * bool) list -> theory -> theory
    28   val add_hook: (string -> (string * thm list) list -> unit) -> unit
    29   val results: string -> (string * thm list) list -> unit
    30   val theorem: string -> thm -> unit
    31   val theorems: string -> thm list -> unit
    32   val chapter: string -> unit
    33   val subsection: string -> unit
    34   val subsubsection: string -> unit
    35   val drafts: string -> Path.T list -> Path.T
    36 end;
    37 
    38 structure Present: PRESENT =
    39 struct
    40 
    41 
    42 (** paths **)
    43 
    44 val output_path = Path.variable "ISABELLE_BROWSER_INFO";
    45 
    46 val tex_ext = Path.ext "tex";
    47 val tex_path = tex_ext o Path.basic;
    48 val html_ext = Path.ext "html";
    49 val html_path = html_ext o Path.basic;
    50 val index_path = Path.basic "index.html";
    51 val readme_html_path = Path.basic "README.html";
    52 val readme_path = Path.basic "README";
    53 val documentN = "document";
    54 val document_path = Path.basic documentN;
    55 val doc_indexN = "session";
    56 val graph_path = Path.basic "session.graph";
    57 val graph_pdf_path = Path.basic "session_graph.pdf";
    58 val graph_eps_path = Path.basic "session_graph.eps";
    59 
    60 val session_path = Path.basic ".session";
    61 val session_entries_path = Path.unpack ".session/entries";
    62 val pre_index_path = Path.unpack ".session/pre-index";
    63 
    64 fun mk_rel_path [] ys = Path.make ys
    65   | mk_rel_path xs [] = Path.appends (replicate (length xs) Path.parent)
    66   | mk_rel_path (ps as x :: xs) (qs as y :: ys) = if x = y then mk_rel_path xs ys else
    67       Path.appends (replicate (length ps) Path.parent @ [Path.make qs]);
    68 
    69 fun show_path path = Path.pack (Path.append (File.pwd ()) path);
    70 
    71 
    72 
    73 (** additional theory data **)
    74 
    75 structure BrowserInfoData = TheoryDataFun
    76 (struct
    77   val name = "Pure/browser_info";
    78   type T = {name: string, session: string list, is_local: bool};
    79   val empty = {name = "", session = [], is_local = false}: T;
    80   val copy = I;
    81   fun extend _ = empty;
    82   fun merge _ _ = empty;
    83   fun print _ _ = ();
    84 end);
    85 
    86 val _ = Context.add_setup BrowserInfoData.init;
    87 
    88 fun get_info thy =
    89   if Context.theory_name thy mem_string [Context.ProtoPureN, Context.PureN, Context.CPureN]
    90   then {name = Context.PureN, session = [], is_local = false}
    91   else BrowserInfoData.get thy;
    92 
    93 
    94 
    95 (** graphs **)
    96 
    97 type graph_node =
    98   {name: string, ID: string, dir: string, unfold: bool,
    99    path: string, parents: string list};
   100 
   101 fun write_graph gr path =
   102   File.write path (cat_lines (map (fn {name, ID, dir, unfold, path, parents} =>
   103     "\"" ^ name ^ "\" \"" ^ ID ^ "\" \"" ^ dir ^ (if unfold then "\" + \"" else "\" \"") ^
   104     path ^ "\" > " ^ space_implode " " (map Library.quote parents) ^ " ;") gr));
   105 
   106 fun ID_of sess s = space_implode "/" (sess @ [s]);
   107 
   108 (*retrieve graph data from initial theory loader database*)
   109 fun init_graph remote_path curr_sess = map (fn name =>
   110   let
   111     val {name = sess_name, session, is_local} = get_info (ThyInfo.theory name);
   112     val path' = Path.append (Path.make session) (html_path name);
   113   in
   114    {name = name, ID = ID_of session name, dir = sess_name,
   115     path =
   116       if null session then "" else
   117       if is_some remote_path andalso not is_local then
   118         Url.pack (Url.append (the remote_path) (Url.File
   119           (Path.append (Path.make session) (html_path name))))
   120       else Path.pack (Path.append (mk_rel_path curr_sess session) (html_path name)),
   121     unfold = false,
   122     parents =
   123       map (fn s => ID_of (#session (get_info (ThyInfo.theory s))) s) (ThyInfo.get_preds name)}
   124   end) (ThyInfo.names ());
   125 
   126 fun ins_graph_entry (entry as {ID, ...}) (gr: graph_node list) =
   127   filter_out (fn entry' => #ID entry' = ID) gr @ [entry];
   128 
   129 
   130 
   131 (** global browser info state **)
   132 
   133 (* type theory_info *)
   134 
   135 type theory_info = {tex_source: Buffer.T, html_source: Buffer.T, html: Buffer.T};
   136 
   137 fun make_theory_info (tex_source, html_source, html) =
   138   {tex_source = tex_source, html_source = html_source, html = html}: theory_info;
   139 
   140 val empty_theory_info = make_theory_info (Buffer.empty, Buffer.empty, Buffer.empty);
   141 
   142 fun map_theory_info f {tex_source, html_source, html} =
   143   make_theory_info (f (tex_source, html_source, html));
   144 
   145 
   146 (* type browser_info *)
   147 
   148 type browser_info = {theories: theory_info Symtab.table, files: (Path.T * string) list,
   149   tex_index: Buffer.T, html_index: Buffer.T, graph: graph_node list};
   150 
   151 fun make_browser_info (theories, files, tex_index, html_index, graph) =
   152   {theories = theories, files = files, tex_index = tex_index, html_index = html_index,
   153     graph = graph}: browser_info;
   154 
   155 val empty_browser_info = make_browser_info (Symtab.empty, [], Buffer.empty, Buffer.empty, []);
   156 
   157 fun init_browser_info remote_path curr_sess = make_browser_info
   158   (Symtab.empty, [], Buffer.empty, Buffer.empty, init_graph remote_path curr_sess);
   159 
   160 fun map_browser_info f {theories, files, tex_index, html_index, graph} =
   161   make_browser_info (f (theories, files, tex_index, html_index, graph));
   162 
   163 
   164 (* state *)
   165 
   166 val browser_info = ref empty_browser_info;
   167 fun change_browser_info f = browser_info := map_browser_info f (! browser_info);
   168 
   169 val suppress_tex_source = ref false;
   170 fun no_document f x = Library.setmp suppress_tex_source true f x;
   171 
   172 fun init_theory_info name info =
   173   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>
   174     (Symtab.update (name, info) theories, files, tex_index, html_index, graph));
   175 
   176 fun change_theory_info name f =
   177   change_browser_info (fn (info as (theories, files, tex_index, html_index, graph)) =>
   178     (case Symtab.lookup theories name of
   179       NONE => (warning ("Browser info: cannot access theory document " ^ quote name); info)
   180     | SOME info => (Symtab.update (name, map_theory_info f info) theories, files,
   181         tex_index, html_index, graph)));
   182 
   183 
   184 fun add_file file =
   185   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>
   186     (theories, file :: files, tex_index, html_index, graph));
   187 
   188 fun add_tex_index txt =
   189   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>
   190     (theories, files, Buffer.add txt tex_index, html_index, graph));
   191 
   192 fun add_html_index txt =
   193   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>
   194     (theories, files, tex_index, Buffer.add txt html_index, graph));
   195 
   196 fun add_graph_entry e =
   197   change_browser_info (fn (theories, files, tex_index, html_index, graph) =>
   198     (theories, files, tex_index, html_index, ins_graph_entry e graph));
   199 
   200 fun add_tex_source name txt =
   201   if ! suppress_tex_source then ()
   202   else change_theory_info name (fn (tex_source, html_source, html) =>
   203     (Buffer.add txt tex_source, html_source, html));
   204 
   205 fun add_html_source name txt = change_theory_info name (fn (tex_source, html_source, html) =>
   206   (tex_source, Buffer.add txt html_source, html));
   207 
   208 fun add_html name txt = change_theory_info name (fn (tex_source, html_source, html) =>
   209   (tex_source, html_source, Buffer.add txt html));
   210 
   211 
   212 
   213 (** global session state **)
   214 
   215 (* session_info *)
   216 
   217 type session_info =
   218   {name: string, parent: string, session: string, path: string list, html_prefix: Path.T,
   219     info: bool, doc_format: string, doc_graph: bool, documents: (string * string) list,
   220     doc_prefix1: (Path.T * Path.T) option, doc_prefix2: (bool * Path.T) option,
   221     remote_path: Url.T option, verbose: bool, readme: Path.T option};
   222 
   223 fun make_session_info
   224   (name, parent, session, path, html_prefix, info, doc_format, doc_graph, documents,
   225     doc_prefix1, doc_prefix2, remote_path, verbose, readme) =
   226   {name = name, parent = parent, session = session, path = path, html_prefix = html_prefix,
   227     info = info, doc_format = doc_format, doc_graph = doc_graph, documents = documents,
   228     doc_prefix1 = doc_prefix1, doc_prefix2 = doc_prefix2, remote_path = remote_path,
   229     verbose = verbose, readme = readme}: session_info;
   230 
   231 
   232 (* state *)
   233 
   234 val session_info = ref (NONE: session_info option);
   235 
   236 fun with_session x f = (case ! session_info of NONE => x | SOME info => f info);
   237 fun with_context f = f (Context.theory_name (Context.the_context ()));
   238 
   239 
   240 
   241 (** document preparation **)
   242 
   243 (* maintain index *)
   244 
   245 val session_entries =
   246   HTML.session_entries o
   247     map (fn name => (Url.File (Path.append (Path.basic name) index_path), name));
   248 
   249 fun get_entries dir =
   250   split_lines (File.read (Path.append dir session_entries_path));
   251 
   252 fun put_entries entries dir =
   253   File.write (Path.append dir session_entries_path) (cat_lines entries);
   254 
   255 
   256 fun create_index dir =
   257   File.read (Path.append dir pre_index_path) ^
   258     session_entries (get_entries dir) ^ HTML.end_index
   259   |> File.write (Path.append dir index_path);
   260 
   261 fun update_index dir name =
   262   (case try get_entries dir of
   263     NONE => warning ("Browser info: cannot access session index of " ^ quote (Path.pack dir))
   264   | SOME es => (put_entries ((es \ name) @ [name]) dir; create_index dir));
   265 
   266 
   267 (* document versions *)
   268 
   269 fun read_version str =
   270   (case space_explode "=" str of
   271     [name] => (name, "")
   272   | [name, tags] => (name, tags)
   273   | _ => error ("Malformed document version specification: " ^ quote str));
   274 
   275 fun read_versions strs =
   276   rev (gen_distinct (eq_fst (op =)) (rev ((documentN, "") :: map read_version strs)))
   277   |> filter_out (equal "-" o #2);
   278 
   279 
   280 (* init session *)
   281 
   282 fun name_of_session elems = space_implode "/" ("Isabelle" :: elems);
   283 
   284 fun init build info doc doc_graph doc_versions path name doc_prefix2
   285     (remote_path, first_time) verbose =
   286   if not build andalso not info andalso doc = "" andalso is_none doc_prefix2 then
   287     (browser_info := empty_browser_info; session_info := NONE)
   288   else
   289     let
   290       val parent_name = name_of_session (Library.take (length path - 1, path));
   291       val session_name = name_of_session path;
   292       val sess_prefix = Path.make path;
   293       val html_prefix = Path.append (Path.expand output_path) sess_prefix;
   294 
   295       val (doc_prefix1, documents) =
   296         if doc = "" then (NONE, [])
   297         else if not (File.exists document_path) then (conditional verbose (fn () =>
   298           std_error "Warning: missing document directory\n"); (NONE, []))
   299         else (SOME (Path.append html_prefix document_path, html_prefix),
   300           read_versions doc_versions);
   301 
   302       val parent_index_path = Path.append Path.parent index_path;
   303       val index_up_lnk = if first_time then
   304           Url.append (the remote_path) (Url.File (Path.append sess_prefix parent_index_path))
   305         else Url.File parent_index_path;
   306       val readme =
   307         if File.exists readme_html_path then SOME readme_html_path
   308         else if File.exists readme_path then SOME readme_path
   309         else NONE;
   310 
   311       val docs =
   312         (case readme of NONE => [] | SOME p => [(Url.File p, "README")]) @
   313         map (fn (name, _) => (Url.File (Path.ext doc (Path.basic name)), name)) documents;
   314       val index_text = HTML.begin_index (index_up_lnk, parent_name)
   315         (Url.File index_path, session_name) docs (Url.unpack "medium.html");
   316     in
   317       session_info := SOME (make_session_info (name, parent_name, session_name, path, html_prefix,
   318       info, doc, doc_graph, documents, doc_prefix1, doc_prefix2, remote_path, verbose, readme));
   319       browser_info := init_browser_info remote_path path;
   320       add_html_index index_text
   321     end;
   322 
   323 
   324 (* isatool wrappers *)
   325 
   326 fun isatool_document verbose format name tags path result_path =
   327   let
   328     val s = "\"$ISATOOL\" document -c -o '" ^ format ^ "' \
   329       \-n '" ^ name ^ "' -t '" ^ tags ^ "' " ^ File.shell_path path ^
   330       " 2>&1" ^ (if verbose then "" else " >/dev/null");
   331     val doc_path = Path.append result_path (Path.ext format (Path.basic name));
   332   in
   333     conditional verbose (fn () => writeln s);
   334     system s;
   335     conditional (not (File.exists doc_path)) (fn () =>
   336       error ("No document: " ^ quote (show_path doc_path)));
   337     doc_path
   338   end;
   339 
   340 fun isatool_browser graph =
   341   let
   342     val pdf_path = File.tmp_path graph_pdf_path;
   343     val eps_path = File.tmp_path graph_eps_path;
   344     val gr_path = File.tmp_path graph_path;
   345     val s = "browser -o " ^ File.shell_path pdf_path ^ " " ^ File.shell_path gr_path;
   346   in
   347     write_graph graph gr_path;
   348     if File.isatool s <> 0 orelse not (File.exists eps_path) orelse not (File.exists pdf_path)
   349     then error "Failed to prepare dependency graph"
   350     else
   351       let val pdf = File.read pdf_path and eps = File.read eps_path
   352       in File.rm pdf_path; File.rm eps_path; File.rm gr_path; (pdf, eps) end
   353   end;
   354 
   355 
   356 (* finish session -- output all generated text *)
   357 
   358 fun write_tex src name path =
   359   Buffer.write (Path.append path (tex_path name)) src;
   360 
   361 fun write_tex_index tex_index path =
   362   write_tex (Buffer.add Latex.tex_trailer tex_index) doc_indexN path;
   363 
   364 
   365 fun finish () = with_session () (fn {name, info, html_prefix, doc_format, doc_graph,
   366     documents, doc_prefix1, doc_prefix2, path, verbose, readme, ...} =>
   367   let
   368     val {theories, files, tex_index, html_index, graph} = ! browser_info;
   369     val thys = Symtab.dest theories;
   370     val parent_html_prefix = Path.append html_prefix Path.parent;
   371 
   372     fun finish_tex path (a, {tex_source, ...}: theory_info) = write_tex tex_source a path;
   373     fun finish_html (a, {html, ...}: theory_info) =
   374       Buffer.write (Path.append html_prefix (html_path a)) (Buffer.add HTML.end_theory html);
   375 
   376     val opt_graphs =
   377       if doc_graph andalso (is_some doc_prefix1 orelse is_some doc_prefix2) then
   378         SOME (isatool_browser graph)
   379       else NONE;
   380 
   381     fun prepare_sources cp path =
   382      (File.mkdir path;
   383       if cp then File.copy_dir document_path path else ();
   384       File.isatool ("latex -o sty " ^ File.shell_path (Path.append path (Path.basic "root.tex")));
   385       (case opt_graphs of NONE => () | SOME (pdf, eps) =>
   386         (File.write (Path.append path graph_pdf_path) pdf;
   387           File.write (Path.append path graph_eps_path) eps));
   388       write_tex_index tex_index path;
   389       List.app (finish_tex path) thys);
   390   in
   391     conditional info (fn () =>
   392      (File.mkdir (Path.append html_prefix session_path);
   393       Buffer.write (Path.append html_prefix pre_index_path) html_index;
   394       File.write (Path.append html_prefix session_entries_path) "";
   395       create_index html_prefix;
   396       if length path > 1 then update_index parent_html_prefix name else ();
   397       (case readme of NONE => () | SOME path => File.copy path html_prefix);
   398       write_graph graph (Path.append html_prefix graph_path);
   399       File.copy (Path.unpack "~~/lib/browser/GraphBrowser.jar") html_prefix;
   400       List.app (fn (a, txt) => File.write (Path.append html_prefix (Path.basic a)) txt)
   401         (HTML.applet_pages name (Url.File index_path, name));
   402       File.copy (Path.unpack "~~/lib/html/isabelle.css") html_prefix;
   403       List.app finish_html thys;
   404       List.app (uncurry File.write) files;
   405       conditional verbose (fn () =>
   406         std_error ("Browser info at " ^ show_path html_prefix ^ "\n"))));
   407 
   408     (case doc_prefix2 of NONE => () | SOME (cp, path) =>
   409      (prepare_sources cp path;
   410       conditional verbose (fn () => std_error ("Document sources at " ^ show_path path ^ "\n"))));
   411 
   412     (case doc_prefix1 of NONE => () | SOME (path, result_path) =>
   413       documents |> List.app (fn (name, tags) =>
   414        let
   415          val _ = prepare_sources true path;
   416          val doc_path = isatool_document true doc_format name tags path result_path;
   417        in
   418          conditional verbose (fn () => std_error ("Document at " ^ show_path doc_path ^ "\n"))
   419        end));
   420 
   421     browser_info := empty_browser_info;
   422     session_info := NONE
   423   end);
   424 
   425 
   426 (* theory elements *)
   427 
   428 fun init_theory name = with_session () (fn _ => init_theory_info name empty_theory_info);
   429 
   430 fun verbatim_source name mk_text =
   431   with_session () (fn _ => add_html_source name (HTML.verbatim_source (mk_text ())));
   432 
   433 fun theory_output name s =
   434   with_session () (fn _ => add_tex_source name (Latex.isabelle_file name s));
   435 
   436 
   437 fun parent_link remote_path curr_session name =
   438   let val {name = _, session, is_local} = get_info (ThyInfo.theory name)
   439   in (if null session then NONE else
   440      SOME (if is_some remote_path andalso not is_local then
   441        Url.append (the remote_path) (Url.File
   442          (Path.append (Path.make session) (html_path name)))
   443      else Url.File (Path.append (mk_rel_path curr_session session)
   444        (html_path name))), name)
   445   end;
   446 
   447 fun begin_theory optpath name raw_parents orig_files thy =
   448     with_session thy (fn {name = sess_name, session, path, html_prefix, remote_path, ...} =>
   449   let
   450     val parents = map (parent_link remote_path path) raw_parents;
   451     val ml_path = ThyLoad.ml_path name;
   452     val files = map (apsnd SOME) orig_files @
   453       (if is_some (ThyLoad.check_file optpath ml_path) then [(ml_path, NONE)] else []);
   454 
   455     fun prep_file (raw_path, loadit) =
   456       (case ThyLoad.check_file optpath raw_path of
   457         SOME (path, _) =>
   458           let
   459             val base = Path.base path;
   460             val base_html = html_ext base;
   461           in
   462             add_file (Path.append html_prefix base_html,
   463               HTML.ml_file (Url.File base) (File.read path));
   464             (SOME (Url.File base_html), Url.File raw_path, loadit)
   465           end
   466       | NONE => (warning ("Browser info: expected to find ML file" ^ quote (Path.pack raw_path));
   467           (NONE, Url.File raw_path, loadit)));
   468 
   469     val files_html = map prep_file files;
   470 
   471     fun prep_html_source (tex_source, html_source, html) =
   472       let
   473         val txt = HTML.begin_theory (Url.File index_path, session)
   474           name parents files_html (Buffer.content html_source)
   475       in (tex_source, Buffer.empty, Buffer.add txt html) end;
   476 
   477     val entry =
   478      {name = name, ID = ID_of path name, dir = sess_name, unfold = true,
   479       path = Path.pack (html_path name),
   480       parents = map (fn s => ID_of (#session (get_info (ThyInfo.theory s))) s) raw_parents};
   481 
   482   in
   483     change_theory_info name prep_html_source;
   484     add_graph_entry entry;
   485     add_html_index (HTML.theory_entry (Url.File (html_path name), name));
   486     add_tex_index (Latex.theory_entry name);
   487     BrowserInfoData.put {name = sess_name, session = path, is_local = is_some remote_path} thy
   488   end);
   489 
   490 
   491 val hooks = ref ([]: (string -> (string * thm list) list -> unit) list);
   492 fun add_hook f = hooks := (f :: ! hooks);
   493 
   494 fun results k xs =
   495  (List.app (fn f => (try (fn () => f k xs) (); ())) (! hooks);
   496   with_session () (fn _ => with_context add_html (HTML.results k xs)));
   497 
   498 fun theorem a th = results "theorem" [(a, [th])];
   499 fun theorems a ths = results "theorems" [(a, ths)];
   500 fun chapter s = with_session () (fn _ => with_context add_html (HTML.chapter s));
   501 fun section s = with_session () (fn _ => with_context add_html (HTML.section s));
   502 fun subsection s = with_session () (fn _ => with_context add_html (HTML.subsection s));
   503 fun subsubsection s = with_session () (fn _ => with_context add_html (HTML.subsubsection s));
   504 
   505 
   506 
   507 (** draft document output **)
   508 
   509 fun drafts doc_format src_paths =
   510   let
   511     fun prep_draft (tex_index, path) =
   512       let
   513         val base = Path.base path;
   514         val name =
   515           (case Path.pack (#1 (Path.split_ext base)) of "" => gensym "DUMMY" | s => s);
   516       in
   517         if File.exists path then
   518           (Buffer.add (Latex.theory_entry name) tex_index, (name, base, File.read path))
   519         else error ("Bad file: " ^ quote (Path.pack path))
   520       end;
   521     val (tex_index, srcs) = foldl_map prep_draft (Buffer.empty, src_paths);
   522 
   523     val doc_path = File.tmp_path document_path;
   524     val result_path = Path.append doc_path Path.parent;
   525     val _ = File.mkdir doc_path;
   526     val root_path = Path.append doc_path (Path.basic "root.tex");
   527     val _ = File.copy (Path.unpack "~~/lib/texinputs/draft.tex") root_path;
   528     val _ = File.isatool ("latex -o sty " ^ File.shell_path root_path);
   529     val _ = File.isatool ("latex -o syms " ^ File.shell_path root_path);
   530 
   531     fun known name =
   532       let val ss = split_lines (File.read (Path.append doc_path (Path.basic name)))
   533       in fn s => s mem_string ss end;
   534     val known_syms = known "syms.lst";
   535     val known_ctrls = known "ctrls.lst";
   536 
   537     val _ = srcs |> List.app (fn (name, base, txt) =>
   538       Symbol.explode txt
   539       |> Latex.symbol_source (known_syms, known_ctrls) (Path.pack base)
   540       |> File.write (Path.append doc_path (tex_path name)));
   541     val _ = write_tex_index tex_index doc_path;
   542   in isatool_document false doc_format documentN "" doc_path result_path end;
   543 
   544 
   545 end;
   546 
   547 structure BasicPresent: BASIC_PRESENT = Present;
   548 open BasicPresent;