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    1/*  Part of SWI-Prolog
    2
    3    Author:        Jan Wielemaker
    4    E-mail:        J.Wielemaker@vu.nl
    5    WWW:           http://www.swi-prolog.org
    6    Copyright (c)  2006-2023, University of Amsterdam
    7			      VU University Amsterdam
    8			      CWI, Amsterdam
    9                              SWI-Prolog Solutions b.v.
   10    All rights reserved.
   11
   12    Redistribution and use in source and binary forms, with or without
   13    modification, are permitted provided that the following conditions
   14    are met:
   15
   16    1. Redistributions of source code must retain the above copyright
   17       notice, this list of conditions and the following disclaimer.
   18
   19    2. Redistributions in binary form must reproduce the above copyright
   20       notice, this list of conditions and the following disclaimer in
   21       the documentation and/or other materials provided with the
   22       distribution.
   23
   24    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   25    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   26    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   27    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   28    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   29    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   30    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   31    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   32    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   34    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   35    POSSIBILITY OF SUCH DAMAGE.
   36*/
   37
   38:- module(pldoc_html,
   39	  [ doc_for_file/2,             % +FileSpec, +Options
   40	    doc_write_html/3,           % +Stream, +Title, +Term
   41	    doc_for_wiki_file/2,        % +FileSpec, +Options
   42					% Support doc_index
   43	    doc_page_dom/3,             % +Title, +Body, -DOM
   44	    print_html_head/1,          % +Stream
   45	    predref//1,                 % +PI //
   46	    predref//2,                 % +PI, Options //
   47	    nopredref//1,               % +PI //
   48	    module_info/3,              % +File, +Options0, -Options
   49	    doc_hide_private/3,         % +Doc0, -Doc, +Options
   50	    edit_button//2,             % +File, +Options, //
   51	    source_button//2,           % +File, +Options, //
   52	    zoom_button//2,             % +File, +Options, //
   53            pred_edit_button//2,        % +PredInd, +Options, //
   54	    object_edit_button//2,      % +Obj, +Options, //
   55	    object_source_button//2,    % +Obj, +Options, //
   56	    doc_resources//1,           % +Options
   57	    ensure_doc_objects/1,       % +File
   58					% Support other backends
   59	    doc_file_objects/5,         % +FSpec, -File, -Objs, -FileOpts, +Opts
   60	    existing_linked_file/2,     % +FileSpec, -Path
   61	    unquote_filespec/2,         % +FileSpec, -Unquoted
   62	    doc_tag_title/2,            % +Tag, -Title
   63	    mode_anchor_name/2,         % +Mode, -Anchor
   64	    pred_anchor_name/3,         % +Head, -PI, -Anchor
   65	    private/2,                  % +Obj, +Options
   66	    (multifile)/2,              % +Obj, +Options
   67	    is_pi/1,                    % @Term
   68	    is_op_type/2,               % +Atom, ?Type
   69					% Output routines
   70	    file//1,                    % +File, //
   71	    file//2,                    % +File, +Options, //
   72	    include//3,                 % +File, +Type, +Options //
   73	    tags//1,                    % +Tags, //
   74	    term//3,                    % +Text, +Term, +Bindings, //
   75	    file_header//2,             % +File, +Options, //
   76	    flagref//1,                 % +Flag
   77	    objects//2,                 % +Objects, +Options, //
   78	    object_ref//2,              % +Object, +Options, //
   79	    object_name//2,             % +Object, +Object
   80	    object_href/2,              % +Object, -URL
   81	    object_tree//3,             % +Tree, +Current, +Options
   82	    object_page//2,             % +Object, +Options, //
   83	    object_page_header//2,      % +File, +Options, //
   84	    object_synopsis//2,         % +Object, +Options, //
   85	    object_footer//2,           % +Object, +Options, //
   86	    object_page_footer//2,      % +Object, +Options, //
   87	    cite//1                     % +Citations
   88	  ]).   89% Get HTTP server infrastructure when available
   90:- if(exists_source(library(http/http_dispatch))).   91:- use_module(library(http/http_dispatch)).   92:- use_module(library(http/http_wrapper)).   93:- use_module(library(http/jquery)).   94
   95pldoc_server(true).
   96:- else.   97
   98:- multifile
   99    http:location/3.  100
  101http:location(pldoc_resource, '/pldoc/res', []).
  102
  103pldoc_server(false).
  104:- endif.  105
  106:- use_module(library(lists)).  107:- use_module(library(option)).  108:- use_module(library(uri)).  109:- use_module(library(readutil)).  110:- use_module(library(http/html_write)).  111:- use_module(library(http/http_path)).  112:- use_module(library(http/html_head)).  113:- use_module(library(http/term_html)).  114:- use_module(library(debug)).  115:- use_module(library(apply)).  116:- use_module(library(pairs)).  117:- use_module(library(filesex)).  118:- use_module(doc_process).  119:- use_module(doc_man).  120:- use_module(doc_modes).  121:- use_module(doc_wiki).  122:- use_module(doc_search).  123:- use_module(doc_index).  124:- use_module(doc_util).  125:- use_module(library(solution_sequences)).  126:- use_module(library(error)).  127:- use_module(library(occurs)).  128:- use_module(library(prolog_source)).  129:- use_module(library(prolog_xref)).  130
  131:- include(hooks).

PlDoc HTML backend

This module translates the Herbrand term from the documentation extracting module doc_wiki.pl into HTML+CSS.

To be done
- Split put generation from computation as computation is reusable in other backends. */
  143:- public
  144    args//1,                        % Called from \Term output created
  145    pred_dt//3,                     % by the wiki renderer
  146    section//2,
  147    tag//2.  148
  149
  150:- predicate_options(doc_for_wiki_file/2, 2,
  151		     [ edit(boolean)
  152		     ]).  153:- predicate_options(doc_hide_private/3, 3,
  154		     [module(atom), public(list), public_only(boolean)]).  155:- predicate_options(edit_button//2, 2,
  156		     [ edit(boolean)
  157		     ]).  158:- predicate_options(file//2, 2,
  159		     [ label(any),
  160		       absolute_path(atom),
  161		       href(atom),
  162		       map_extension(list),
  163		       files(list),
  164		       edit_handler(atom)
  165		     ]).  166:- predicate_options(file_header//2, 2,
  167		     [ edit(boolean),
  168		       files(list),
  169		       public_only(boolean)
  170		     ]).  171:- predicate_options(include//3, 3,
  172		     [ absolute_path(atom),
  173		       class(atom),
  174		       files(list),
  175		       href(atom),
  176		       label(any),
  177		       map_extension(list)
  178		     ]).  179:- predicate_options(object_edit_button//2, 2,
  180		     [ edit(boolean),
  181		       pass_to(pred_edit_button//2, 2)
  182		     ]).  183:- predicate_options(object_page//2, 2,
  184		     [ for(any),
  185		       header(boolean),
  186		       links(boolean),
  187		       no_manual(boolean),
  188		       try_manual(boolean),
  189		       search_in(oneof([all,app,man])),
  190		       search_match(oneof([name,summary])),
  191		       search_options(boolean)
  192		     ]).  193:- predicate_options(object_ref//2, 2,
  194		     [ files(list),
  195		       qualify(boolean),
  196		       style(oneof([number,title,number_title])),
  197		       secref_style(oneof([number,title,number_title]))
  198		     ]).  199:- predicate_options(object_synopsis//2, 2,
  200		     [ href(atom)
  201		     ]).  202:- predicate_options(pred_dt//3, 3,
  203		     [ edit(boolean)
  204		     ]).  205:- predicate_options(pred_edit_button//2, 2,
  206		     [ edit(boolean)
  207		     ]).  208:- predicate_options(predref//2, 2,
  209		     [ files(list),
  210		       prefer(oneof([manual,app])),
  211		       pass_to(object_ref/4, 2)
  212		     ]).  213:- predicate_options(private/2, 2,
  214		     [ module(atom),
  215		       public(list)
  216		     ]).  217:- predicate_options(source_button//2, 2,
  218		     [ files(list)
  219		     ]).  220
  221
  222		 /*******************************
  223		 *           RESOURCES          *
  224		 *******************************/
  225
  226:- if(pldoc_server(true)).  227:- html_resource(pldoc_css,
  228		 [ virtual(true),
  229		   requires([ pldoc_resource('pldoc.css')
  230			    ])
  231		 ]).  232:- html_resource(pldoc_resource('pldoc.js'),
  233		 [ requires([ jquery
  234			    ])
  235		 ]).  236:- html_resource(pldoc_js,
  237		 [ virtual(true),
  238		   requires([ pldoc_resource('pldoc.js')
  239			    ])
  240		 ]).  241:- html_resource(pldoc,
  242		 [ virtual(true),
  243		   requires([ pldoc_css,
  244			      pldoc_js
  245			    ])
  246		 ]).  247:- else.  248:- html_resource(pldoc_css, [virtual(true)]).  249:- html_resource(pldoc_resource('pldoc.js'), [virtual(true)]).  250:- html_resource(pldoc_js, [virtual(true)]).  251:- html_resource(pldoc, [virtual(true)]).  252:- endif.  253
  254
  255		 /*******************************
  256		 *       FILE PROCESSING        *
  257		 *******************************/
 doc_for_file(+File, +Options) is det
HTTP handler that writes documentation for File as HTML. Options:
public_only(+Bool)
If true (default), only emit documentation for exported predicates.
edit(Bool)
If true, provide edit buttons. Default, these buttons are suppressed.
title(+Title)
Specify the page title. Default is the base name of the file.
Arguments:
File- Prolog file specification or xref source id.
  278doc_for_file(FileSpec, Options) :-
  279    doc_file_objects(FileSpec, File, Objects, FileOptions, Options),
  280    doc_file_title(File, Title, FileOptions, Options),
  281    doc_write_page(
  282	pldoc(file(File, Title)),
  283	title(Title),
  284	\prolog_file(File, Objects, FileOptions, Options),
  285	Options).
  286
  287doc_file_title(_, Title, _, Options) :-
  288    option(title(Title), Options),
  289    !.
  290doc_file_title(File, Title, FileOptions, _) :-
  291    memberchk(file(Title0, _Comment), FileOptions),
  292    !,
  293    file_base_name(File, Base),
  294    atomic_list_concat([Base, ' -- ', Title0], Title).
  295doc_file_title(File, Title, _, _) :-
  296    file_base_name(File, Title).
  297
  298:- html_meta doc_write_page(+, html, html, +).  299
  300doc_write_page(Style, Head, Body, Options) :-
  301    option(files(_), Options),
  302    !,
  303    phrase(page(Style, Head, Body), HTML),
  304    print_html(HTML).
  305doc_write_page(Style, Head, Body, _) :-
  306    reply_html_page(Style, Head, Body).
  307
  308
  309prolog_file(File, Objects, FileOptions, Options) -->
  310    { b_setval(pldoc_file, File),   % TBD: delete?
  311      file_directory_name(File, Dir)
  312    },
  313    html([ \doc_resources(Options),
  314	   \doc_links(Dir, FileOptions),
  315	   \file_header(File, FileOptions)
  316	 | \objects(Objects, FileOptions)
  317	 ]),
  318    undocumented(File, Objects, FileOptions).
 doc_resources(+Options)// is det
Include required resources (CSS, JS) into the output. The first clause supports doc_files.pl. A bit hacky ...
  325doc_resources(Options) -->
  326    { option(resource_directory(ResDir), Options),
  327      nb_current(pldoc_output, OutputFile),
  328      !,
  329      directory_file_path(ResDir, 'pldoc.css', Res),
  330      relative_file_name(Res, OutputFile, Ref)
  331    },
  332    html_requires(Ref).
  333doc_resources(Options) -->
  334    { option(html_resources(Resoures), Options, pldoc)
  335    },
  336    html_requires(Resoures).
 doc_file_objects(+FileSpec, -File, -Objects, -FileOptions, +Options) is det
Extracts relevant information for FileSpec from the PlDoc database. FileOptions contains:

Objects contains

We distinguish three different states for FileSpec:

  1. File was cross-referenced with collection enabled. All information is in the xref database.
  2. File was loaded. If comments are not loaded, cross-reference the file, while storing the comments as the compiler would do.
  3. Neither of the above. In this case we cross-reference the file.
Arguments:
FileSpec- File specification as used for load_files/2.
File- Prolog canonical filename
  365doc_file_objects(FileSpec, File, Objects, FileOptions, Options) :-
  366    xref_current_source(FileSpec),
  367    xref_option(FileSpec, comments(collect)),
  368    !,
  369    File = FileSpec,
  370    findall(Object, xref_doc_object(File, Object), Objects0),
  371    reply_file_objects(File, Objects0, Objects, FileOptions, Options).
  372doc_file_objects(FileSpec, File, Objects, FileOptions, Options) :-
  373    absolute_file_name(FileSpec, File,
  374		       [ file_type(prolog),
  375			 access(read)
  376		       ]),
  377    source_file(File),
  378    !,
  379    ensure_doc_objects(File),
  380    Pos = File:Line,
  381    findall(Line-doc(Obj,Pos,Comment),
  382	    doc_comment(Obj, Pos, _, Comment), Pairs),
  383    sort(Pairs, Pairs1),            % remove duplicates
  384    keysort(Pairs1, ByLine),
  385    pairs_values(ByLine, Objs0),
  386    reply_file_objects(File, Objs0, Objects, FileOptions, Options).
  387doc_file_objects(FileSpec, File, Objects, FileOptions, Options) :-
  388    absolute_file_name(FileSpec, File,
  389		       [ file_type(prolog),
  390			 access(read)
  391		       ]),
  392    xref_source(File, [silent(true)]),
  393    findall(Object, xref_doc_object(File, Object), Objects0),
  394    reply_file_objects(File, Objects0, Objects, FileOptions, Options).
  395
  396
  397reply_file_objects(File, Objs0, Objects, FileOptions, Options) :-
  398    module_info(File, ModuleOptions, Options),
  399    file_info(Objs0, Objs1, FileOptions, ModuleOptions),
  400    doc_hide_private(Objs1, ObjectsSelf, ModuleOptions),
  401    include_reexported(ObjectsSelf, Objects1, File, FileOptions),
  402    remove_doc_duplicates(Objects1, Objects, []).
  403
  404remove_doc_duplicates([], [], _).
  405remove_doc_duplicates([H|T0], [H|T], Seen) :-
  406    H = doc(_, _, Comment),
  407    \+ memberchk(Comment, Seen),
  408    !,
  409    remove_doc_duplicates(T0, T, [Comment|Seen]).
  410remove_doc_duplicates([_|T0], T, Seen) :-
  411    remove_doc_duplicates(T0, T, Seen).
  412
  413include_reexported(SelfObjects, Objects, File, Options) :-
  414    option(include_reexported(true), Options),
  415    option(module(Module), Options),
  416    option(public(Exports), Options),
  417    select_undocumented(Exports, Module, SelfObjects, Undoc),
  418    re_exported_doc(Undoc, File, Module, REObjs, _),
  419    REObjs \== [],
  420    !,
  421    append(SelfObjects, REObjs, Objects).
  422include_reexported(Objects, Objects, _, _).
 xref_doc_object(File, DocObject) is nondet
  427xref_doc_object(File, doc(M:module(Title),File:0,Comment)) :-
  428    xref_comment(File, Title, Comment),
  429    xref_module(File, M).
  430xref_doc_object(File, doc(M:Name/Arity,File:0,Comment)) :-
  431    xref_comment(File, Head, _Summary, Comment),
  432    xref_module(File, Module),
  433    strip_module(Module:Head, M, Plain),
  434    functor(Plain, Name, Arity).
 ensure_doc_objects(+File) is det
Ensure we have documentation about File. If we have no comments for the file because it was loaded before comment collection was enabled, run the cross-referencer on it to collect the comments and meta-information.
Arguments:
File- is a canonical filename that is loaded.
  445:- dynamic
  446    no_comments/2.  447
  448ensure_doc_objects(File) :-
  449    source_file(File),
  450    !,
  451    (   doc_file_has_comments(File)
  452    ->  true
  453    ;   no_comments(File, TimeChecked),
  454	time_file(File, TimeChecked)
  455    ->  true
  456    ;   xref_source(File, [silent(true), comments(store)]),
  457	retractall(no_comments(File, _)),
  458	(   doc_file_has_comments(File)
  459	->  true
  460	;   time_file(File, TimeChecked),
  461	    assertz(no_comments(File, TimeChecked))
  462	)
  463    ).
  464ensure_doc_objects(File) :-
  465    xref_source(File, [silent(true)]).
 module_info(+File, -ModuleOptions, +OtherOptions) is det
Add options module(Name), public(Exports) to OtherOptions if File is a module file.
  472module_info(File, [module(Module), public(Exports)|Options], Options) :-
  473    module_property(Module, file(File)),
  474    !,
  475    module_property(Module, exports(Exports)).
  476module_info(File, [module(Module), public(Exports)|Options], Options) :-
  477    xref_module(File, Module),
  478    !,
  479    findall(PI, xref_exported_pi(File, PI), Exports).
  480module_info(_, Options, Options).
  481
  482xref_exported_pi(Src, Name/Arity) :-
  483    xref_exported(Src, Head),
  484    functor(Head, Name, Arity).
 doc_hide_private(+Objs, +Public, +Options)
Remove the private objects from Objs according to Options.
  490doc_hide_private(Objs, Objs, Options) :-
  491    option(public_only(false), Options, true),
  492    !.
  493doc_hide_private(Objs0, Objs, Options) :-
  494    hide_private(Objs0, Objs, Options).
  495
  496hide_private([], [], _).
  497hide_private([H|T0], T, Options) :-
  498    obj(H, Obj),
  499    private(Obj, Options),
  500    !,
  501    hide_private(T0, T, Options).
  502hide_private([H|T0], [H|T], Options) :-
  503    hide_private(T0, T, Options).
 obj(+Term, -Object) is det
Extract the documented object from its environment. It is assumed to be the first term. Note that if multiple objects are described by the same comment Term is a list.
  511obj(doc(Obj0, _Pos, _Summary), Obj) :-
  512    !,
  513    (   Obj0 = [Obj|_]
  514    ->  true
  515    ;   Obj = Obj0
  516    ).
  517obj(Obj0, Obj) :-
  518    (   Obj0 = [Obj|_]
  519    ->  true
  520    ;   Obj = Obj0
  521    ).
 private(+Obj, +Options) is semidet
True if Obj is not exported from Options. This means Options defined a module and Obj is not member of the exports of the module.
  530:- multifile
  531    prolog:doc_is_public_object/1.  532
  533private(Object, _Options) :-
  534    prolog:doc_is_public_object(Object), !, fail.
  535private(Module:PI, Options) :-
  536    multifile(Module:PI, Options), !, fail.
  537private(Module:PI, Options) :-
  538    public(Module:PI, Options), !, fail.
  539private(Module:PI, Options) :-
  540    option(module(Module), Options),
  541    option(public(Public), Options),
  542    !,
  543    \+ ( member(PI2, Public),
  544	 eq_pi(PI, PI2)
  545       ).
  546private(Module:PI, _Options) :-
  547    module_property(Module, file(_)),      % A loaded module
  548    !,
  549    module_property(Module, exports(Exports)),
  550    \+ ( member(PI2, Exports),
  551	 eq_pi(PI, PI2)
  552       ).
  553private(Module:PI, _Options) :-
  554    \+ (pi_to_head(PI, Head),
  555	xref_exported(Source, Head),
  556	xref_module(Source, Module)).
 prolog:doc_is_public_object(+Object) is semidet
Hook that allows objects to be displayed with the default public-only view.
 multifile(+Obj, +Options) is semidet
True if Obj is a multifile predicate.
  567multifile(Obj, _Options) :-
  568    strip_module(user:Obj, Module, PI),
  569    pi_to_head(PI, Head),
  570    (   predicate_property(Module:Head, multifile)
  571    ;   xref_module(Source, Module),
  572	xref_defined(Source, Head, multifile(_Line))
  573    ),
  574    !.
 public(+Options, +Options)
True if Obj is declared using public/1.
  580public(Obj, _Options) :-
  581    strip_module(user:Obj, Module, PI),
  582    pi_to_head(PI, Head),
  583    (   predicate_property(Module:Head, public)
  584    ;   xref_module(Source, Module),
  585	xref_defined(Source, Head, public(_Line))
  586    ),
  587    !.
  588
  589pi_to_head(Var, _) :-
  590    var(Var), !, fail.
  591pi_to_head(Name/Arity, Term) :-
  592    functor(Term, Name, Arity).
  593pi_to_head(Name//DCGArity, Term) :-
  594    Arity is DCGArity+2,
  595    functor(Term, Name, Arity).
 file_info(+Comments, -RestComment, -FileOptions, +OtherOptions) is det
Add options file(Title, Comment) to OtherOptions if available.
  601file_info(Comments, RestComments, [file(Title, Comment)|Opts], Opts) :-
  602    select(doc(_:module(Title),_,Comment), Comments, RestComments),
  603    !.
  604file_info(Comments, Comments, Opts, Opts).
 file_header(+File, +Options)// is det
Create the file header.
  611file_header(File, Options) -->
  612    { memberchk(file(Title, Comment), Options),
  613      !,
  614      file_base_name(File, Base)
  615    },
  616    file_title([Base, ' -- ', Title], File, Options),
  617    { is_structured_comment(Comment, Prefixes),
  618      string_codes(Comment, Codes),
  619      indented_lines(Codes, Prefixes, Lines),
  620      section_comment_header(Lines, _Header, Lines1),
  621      wiki_lines_to_dom(Lines1, [], DOM)
  622    },
  623    html(DOM).
  624file_header(File, Options) -->
  625    { file_base_name(File, Base)
  626    },
  627    file_title([Base], File, Options).
 file_title(+Title:list, +File, +Options)// is det
Emit the file-header and manipulation buttons.
  634file_title(Title, File, Options) -->
  635    prolog:doc_file_title(Title, File, Options),
  636    !.
  637file_title(Title, File, Options) -->
  638    { file_base_name(File, Base)
  639    },
  640    html(h1(class(file),
  641	    [ span(style('float:right'),
  642		   [ \reload_button(File, Base, Options),
  643		     \zoom_button(Base, Options),
  644		     \source_button(Base, Options),
  645		     \edit_button(File, Options)
  646		   ])
  647	    | Title
  648	    ])).
 reload_button(+File, +Base, +Options)// is det
Create a button for reloading the sources and updating the documentation page. Note that the button is not shown if the file is not loaded because we do not want to load files through the documentation system.
  658reload_button(File, _Base, Options) -->
  659    { \+ source_file(File),
  660      \+ option(files(_), Options)
  661    },
  662    !,
  663    html(span(class(file_anot), '[not loaded]')).
  664reload_button(_File, Base, Options) -->
  665    { option(edit(true), Options),
  666      !,
  667      option(public_only(Public), Options, true)
  668    },
  669    html(a(href(Base+[reload(true), public_only(Public)]),
  670	   img([ class(action),
  671		 alt('Reload'),
  672		 title('Make & Reload'),
  673		 src(location_by_id(pldoc_resource)+'reload.png')
  674	       ]))).
  675reload_button(_, _, _) --> [].
 edit_button(+File, +Options)// is det
Create an edit button for File. If the button is clicked, JavaScript sends a message to the server without modifying the current page. JavaScript code is in the file pldoc.js.
  683edit_button(File, Options) -->
  684    { option(edit(true), Options)
  685    },
  686    !,
  687    html(a([ onClick('HTTPrequest(\'' +
  688		     location_by_id(pldoc_edit) + [file(File)] +
  689		     '\')')
  690	   ],
  691	   img([ class(action),
  692		 alt(edit),
  693		 title('Edit file'),
  694		 src(location_by_id(pldoc_resource)+'edit.png')
  695	     ]))).
  696edit_button(_, _) -->
  697    [].
 zoom_button(BaseName, +Options)// is det
Add zoom in/out button to show/hide the private documentation.
  704zoom_button(_, Options) -->
  705    { option(files(_Map), Options) },
  706    !.    % generating files
  707zoom_button(Base, Options) -->
  708    {   (   option(public_only(true), Options, true)
  709	->  Zoom = 'public.png',
  710	    Alt = 'Public',
  711	    Title = 'Click to include private',
  712	    PublicOnly = false
  713	;   Zoom = 'private.png',
  714	    Alt = 'All predicates',
  715	    Title = 'Click to show exports only',
  716	    PublicOnly = true
  717	)
  718    },
  719    html(a(href(Base+[public_only(PublicOnly)]),
  720	   img([ class(action),
  721		 alt(Alt),
  722		 title(Title),
  723		 src(location_by_id(pldoc_resource)+Zoom)
  724	       ]))).
 source_button(+File, +Options)// is det
Add show-source button.
  731source_button(_File, Options) -->
  732    { option(files(_Map), Options) },
  733    !.    % generating files
  734source_button(File, _Options) -->
  735    { (   is_absolute_file_name(File)
  736      ->  doc_file_href(File, HREF0)
  737      ;   HREF0 = File
  738      )
  739    },
  740    html(a(href(HREF0+[show(src)]),
  741	   img([ class(action),
  742		 alt('Show source'),
  743		 title('Show source'),
  744		 src(location_by_id(pldoc_resource)+'source.png')
  745	       ]))).
 objects(+Objects:list, +Options)// is det
Emit the documentation body. Options includes:
navtree(+Boolean)
If true, provide a navitation tree.
  755objects(Objects, Options) -->
  756    { option(navtree(true), Options),
  757      !,
  758      objects_nav_tree(Objects, Tree)
  759    },
  760    html([ div(class(navtree),
  761	       div(class(navwindow),
  762		   \nav_tree(Tree, Objects, Options))),
  763	   div(class(navcontent),
  764	       \objects_nt(Objects, Options))
  765	 ]).
  766objects(Objects, Options) -->
  767    objects_nt(Objects, Options).
  768
  769objects_nt(Objects, Options) -->
  770    objects(Objects, [body], Options).
  771
  772objects([], Mode, _) -->
  773    pop_mode(body, Mode, _).
  774objects([Obj|T], Mode, Options) -->
  775    object(Obj, Mode, Mode1, Options),
  776    objects(T, Mode1, Options).
 object(+Spec, +ModeIn, -ModeOut, +Options)// is det
Emit the documentation of a single object.
Arguments:
Spec- is one of doc(Obj,Pos,Comment), which is used to list the objects documented in a file or a plain Obj, used for documenting the object regardless of its location.
  787object(doc(Obj,Pos,Comment), Mode0, Mode, Options) -->
  788    !,
  789    object(Obj, [Pos-Comment], Mode0, Mode, [scope(file)|Options]).
  790object(Obj, Mode0, Mode, Options) -->
  791    { findall(Pos-Comment,
  792	      doc_comment(Obj, Pos, _Summary, Comment),
  793	      Pairs)
  794    },
  795    !,
  796    { b_setval(pldoc_object, Obj) },
  797    object(Obj, Pairs, Mode0, Mode, Options).
  798
  799object(Obj, Pairs, Mode0, Mode, Options) -->
  800    { is_pi(Obj),
  801      !,
  802      maplist(pred_dom(Obj, Options), Pairs, DOMS),
  803      append(DOMS, DOM)
  804    },
  805    need_mode(dl, Mode0, Mode),
  806    html(DOM).
  807object([Obj|_Same], Pairs, Mode0, Mode, Options) -->
  808    !,
  809    object(Obj, Pairs, Mode0, Mode, Options).
  810object(Obj, _Pairs, Mode, Mode, _Options) -->
  811    { debug(pldoc, 'Skipped ~p', [Obj]) },
  812    [].
  813
  814pred_dom(Obj, Options, Pos-Comment, DOM) :-
  815    is_structured_comment(Comment, Prefixes),
  816    string_codes(Comment, Codes),
  817    indented_lines(Codes, Prefixes, Lines),
  818    strip_module(user:Obj, Module, _),
  819    process_modes(Lines, Module, Pos, Modes, Args, Lines1),
  820    (   private(Obj, Options)
  821    ->  Class = privdef             % private definition
  822    ;   multifile(Obj, Options)
  823    ->  (   option(scope(file), Options)
  824	->  (   more_doc(Obj, Pos)
  825	    ->  Class = multidef(object(Obj))
  826	    ;   Class = multidef
  827	    )
  828	;   Class = multidef(file((Pos)))
  829	)
  830    ;   public(Obj, Options)
  831    ->  Class = publicdef           % :- public definition
  832    ;   Class = pubdef              % exported definition
  833    ),
  834    (   Obj = Module:_
  835    ->  POptions = [module(Module)|Options]
  836    ;   POptions = Options
  837    ),
  838    Pos = File:Line,
  839    DTOptions = [file(File),line(Line)|POptions],
  840    DOM = [\pred_dt(Modes, Class, DTOptions), dd(class=defbody, DOM1)],
  841    wiki_lines_to_dom(Lines1, Args, DOM0),
  842    strip_leading_par(DOM0, DOM1).
  843
  844more_doc(Obj, File:_) :-
  845    doc_comment(Obj, File2:_, _, _),
  846    File2 \== File,
  847    !.
 need_mode(+Mode:atom, +Stack:list, -NewStack:list)// is det
While predicates are part of a description list, sections are not and we therefore need to insert <dl>...</dl> into the output. We do so by demanding an outer environment and push/pop the required elements.
  856need_mode(Mode, Stack, Stack) -->
  857    { Stack = [Mode|_] },
  858    !,
  859    [].
  860need_mode(Mode, Stack, Rest) -->
  861    { memberchk(Mode, Stack)
  862    },
  863    !,
  864    pop_mode(Mode, Stack, Rest).
  865need_mode(Mode, Stack, [Mode|Stack]) -->
  866    !,
  867    html_begin(Mode).
  868
  869pop_mode(Mode, Stack, Stack) -->
  870    { Stack = [Mode|_] },
  871    !,
  872    [].
  873pop_mode(Mode, [H|Rest0], Rest) -->
  874    html_end(H),
  875    pop_mode(Mode, Rest0, Rest).
 undocumented(+File, +Objects, +Options)// is det
Describe undocumented predicates if the file is a module file.
  881undocumented(File, Objs, Options) -->
  882    { memberchk(module(Module), Options),
  883      memberchk(public(Exports), Options),
  884      select_undocumented(Exports, Module, Objs, Undoc),
  885      re_exported_doc(Undoc, File, Module, UREObjs, ReallyUnDoc),
  886      sort(2, @=<, UREObjs, REObjs) % UREObjs = doc(PI,Pos,Comment)
  887                                    % i.e., sort on Pos
  888    },
  889    !,
  890    re_exported_doc(REObjs, Options),
  891    undocumented(ReallyUnDoc, Options).
  892undocumented(_, _, _) -->
  893    [].
  894
  895re_exported_doc([], _) --> !.
  896re_exported_doc(Objs, Options) -->
  897    reexport_header(Objs, Options),
  898    objects(Objs, Options).
  899
  900reexport_header(_, Options) -->
  901    { option(reexport_header(true), Options, true)
  902    },
  903    !,
  904    html([ h2(class(wiki), 'Re-exported predicates'),
  905	   p([ "The following predicates are exported from this file \c
  906                while their implementation is defined in imported modules \c
  907                or non-module files loaded by this module."
  908	     ])
  909	 ]).
  910reexport_header(_, _) -->
  911    [].
  912
  913undocumented([], _) --> !.
  914undocumented(UnDoc, Options) -->
  915    html([ h2(class(undoc), 'Undocumented predicates'),
  916	   p(['The following predicates are exported, but not ',
  917	      'or incorrectly documented.'
  918	     ]),
  919	   dl(class(undoc),
  920	      \undocumented_predicates(UnDoc, Options))
  921	 ]).
  922
  923
  924undocumented_predicates([], _) -->
  925    [].
  926undocumented_predicates([H|T], Options) -->
  927    undocumented_pred(H, Options),
  928    undocumented_predicates(T, Options).
  929
  930undocumented_pred(Name/Arity, Options) -->
  931    { functor(Head, Name, Arity) },
  932    html(dt(class=undoc, \pred_mode(Head, [], _, Options))).
  933
  934select_undocumented([], _, _, []).
  935select_undocumented([PI|T0], M, Objs, [PI|T]) :-
  936    is_pi(PI),
  937    \+ in_doc(M:PI, Objs),
  938    !,
  939    select_undocumented(T0, M, Objs, T).
  940select_undocumented([_|T0], M, Objs, T) :-
  941    select_undocumented(T0, M, Objs, T).
  942
  943in_doc(PI, Objs) :-
  944    member(doc(O,_,_), Objs),
  945    (   is_list(O)
  946    ->  member(O2, O),
  947	eq_pi(PI, O2)
  948    ;   eq_pi(PI, O)
  949    ).
 eq_pi(PI1, PI2) is semidet
True if PI1 and PI2 refer to the same predicate.
  956eq_pi(PI, PI) :- !.
  957eq_pi(M:PI1, M:PI2) :-
  958    atom(M),
  959    !,
  960    eq_pi(PI1, PI2).
  961eq_pi(Name/A, Name//DCGA) :-
  962    A =:= DCGA+2,
  963    !.
  964eq_pi(Name//DCGA, Name/A) :-
  965    A =:= DCGA+2.
 is_pi(@Term) is semidet
True if Term is a predicate indicator.
  971is_pi(Var) :-
  972    var(Var),
  973    !,
  974    fail.
  975is_pi(_:PI) :-
  976    !,
  977    is_pi(PI).
  978is_pi(_/_).
  979is_pi(_//_).
 re_exported_doc(+Undoc:list(pi), +File:atom, +Module:atom, -ImportedDoc, -ReallyUnDoc:list(pi))
  985re_exported_doc([], _, _, [], []).
  986re_exported_doc([PI|T0], File, Module, [doc(Orig:PI,Pos,Comment)|ObjT], UnDoc) :-
  987    pi_to_head(PI, Head),
  988    (   predicate_property(Module:Head, imported_from(Orig))
  989    ->  true
  990    ;   predicate_property(Module:Head, exported)
  991    ->  Orig = Module
  992    ;   xref_defined(File, Head, imported(File2)),
  993	ensure_doc_objects(File2),
  994	xref_module(File2, Orig)
  995    ),
  996    doc_comment(Orig:PI, Pos, _, Comment),
  997    !,
  998    re_exported_doc(T0, File, Module, ObjT, UnDoc).
  999re_exported_doc([PI|T0], File, Module, REObj, [PI|UnDoc]) :-
 1000    re_exported_doc(T0, File, Module, REObj, UnDoc).
 1001
 1002
 1003		 /*******************************
 1004		 *      SINGLE OBJECT PAGE      *
 1005		 *******************************/
 object_page(+Obj, +Options)// is semidet
Generate an HTML page describing Obj. The top presents the file the object is documented in and a search-form. Options:
header(+Boolean)
Show the navigation and search header.
 1015object_page(Obj, Options) -->
 1016    prolog:doc_object_page(Obj, Options),
 1017    !,
 1018    object_page_footer(Obj, Options).
 1019object_page(Obj, Options) -->
 1020    { doc_comment(Obj, File:_Line, _Summary, _Comment)
 1021    },
 1022    !,
 1023    (   { \+ ( doc_comment(Obj, File2:_, _, _),
 1024	       File2 \== File )
 1025	}
 1026    ->  html([ \html_requires(pldoc),
 1027	       \object_page_header(File, Options),
 1028	       \object_synopsis(Obj, []),
 1029	       \objects([Obj], Options)
 1030	     ])
 1031    ;   html([ \html_requires(pldoc),
 1032	       \object_page_header(-, Options),
 1033	       \objects([Obj], [synopsis(true)|Options])
 1034	     ])
 1035    ),
 1036    object_page_footer(Obj, Options).
 1037object_page(M:Name/Arity, Options) -->          % specified module, but public
 1038    { functor(Head, Name, Arity),
 1039      (   predicate_property(M:Head, exported)
 1040      ->  module_property(M, class(library))
 1041      ;   \+ predicate_property(M:Head, defined)
 1042      )
 1043    },
 1044    prolog:doc_object_page(Name/Arity, Options),
 1045    !,
 1046    object_page_footer(Name/Arity, Options).
 1047
 1048object_page_header(File, Options) -->
 1049    prolog:doc_page_header(file(File), Options),
 1050    !.
 1051object_page_header(File, Options) -->
 1052    { option(header(true), Options, true) },
 1053    !,
 1054    html(div(class(navhdr),
 1055	     [ div(class(jump), \file_link(File)),
 1056	       div(class(search), \search_form(Options)),
 1057	       br(clear(right))
 1058	     ])).
 1059object_page_header(_, _) --> [].
 1060
 1061file_link(-) -->
 1062    !,
 1063    places_menu(-).
 1064file_link(File) -->
 1065    { file_directory_name(File, Dir)
 1066    },
 1067    places_menu(Dir),
 1068    html([ div(a(href(location_by_id(pldoc_doc)+File), File))
 1069	 ]).
 object_footer(+Obj, +Options)// is det
Call the hook doc_object_footer//2. This hook will be used to deal with examples.
 1076object_footer(Obj, Options) -->
 1077    prolog:doc_object_footer(Obj, Options),
 1078    !.
 1079object_footer(_, _) --> [].
 object_page_footer(+Obj, +Options)// is det
Call the hook doc_object_page_footer//2. This hook will be used to deal with annotations.
 1087object_page_footer(Obj, Options) -->
 1088    prolog:doc_object_page_footer(Obj, Options),
 1089    !.
 1090object_page_footer(_, _) --> [].
 object_synopsis(Obj, Options)// is det
Provide additional information about Obj. Note that due to reexport facilities, predicates may be available from multiple modules.
To be done
- Currently we provide a synopsis for the one where the definition resides. This is not always correct. Notably there are cases where multiple implementation modules are bundled in a larger interface that is the `preferred' module.
 1104object_synopsis(Name/Arity, _) -->
 1105    { functor(Head, Name, Arity),
 1106      predicate_property(system:Head, built_in)
 1107    },
 1108    synopsis([span(class(builtin), 'built-in')]).
 1109object_synopsis(Name/Arity, Options) -->
 1110    !,
 1111    object_synopsis(_:Name/Arity, Options).
 1112object_synopsis(M:Name/Arity, Options) -->
 1113    { functor(Head, Name, Arity),
 1114      (   option(source(Spec), Options)
 1115      ->  absolute_file_name(Spec, File,
 1116			     [ access(read),
 1117			       file_type(prolog),
 1118			       file_errors(fail)
 1119			     ])
 1120      ;   predicate_property(M:Head, exported),
 1121	  \+ predicate_property(M:Head, imported_from(_)),
 1122	  module_property(M, file(File)),
 1123	  file_name_on_path(File, Spec)
 1124      ),
 1125      !,
 1126      unquote_filespec(Spec, Unquoted)
 1127    },
 1128    use_module_synopsis(Head, File, Unquoted, Options).
 1129object_synopsis(Name//Arity, Options) -->
 1130    !,
 1131    { DCGArity is Arity+2 },
 1132    object_synopsis(Name/DCGArity, Options).
 1133object_synopsis(Module:Name//Arity, Options) -->
 1134    !,
 1135    { DCGArity is Arity+2 },
 1136    object_synopsis(Module:Name/DCGArity, Options).
 1137object_synopsis(f(_/_), _) -->
 1138    synopsis(span(class(function),
 1139		  [ 'Arithmetic function (see ',
 1140		    \object_ref(is/2, []),
 1141		    ')'
 1142		  ])).
 1143object_synopsis(c(Func), _) -->
 1144    {   sub_atom(Func, 0, _, _, 'PL_')
 1145    ;   sub_atom(Func, 0, _, _, 'S')
 1146    },
 1147    !,
 1148    synopsis([span(class(cfunc), 'C-language interface function')]).
 1149object_synopsis(_, _) --> [].
 1150
 1151:- html_meta(synopsis(html,?,?)). 1152
 1153use_module_synopsis(Head, File, Unquoted, Options) -->
 1154    { Args = [class(copy), title('Click to copy')] },
 1155    (   { option(href(HREF), Options) }
 1156    ->  synopsis([ code(Args, [':- use_module(',a(href(HREF), '~q'-[Unquoted]),').'])
 1157                 | \can_autoload(Head, File)
 1158                 ])
 1159    ;   synopsis([ code(Args, ':- use_module(~q).'-[Unquoted])
 1160                 | \can_autoload(Head, File)
 1161                 ])
 1162    ).
 1163
 1164synopsis(HTML) -->
 1165    html(div(class(synopsis),
 1166	     [ span(class('synopsis-hdr'), 'Availability:')
 1167	     | HTML
 1168	     ])).
 1169
 1170can_autoload(Head, File) -->
 1171    { predicate_property(Head, autoload(FileBase)),
 1172      file_name_extension(FileBase, _Ext, File)
 1173    },
 1174    !,
 1175    html(span(class(autoload), \can_be_autoloaded)).
 1176can_autoload(_, _) -->
 1177    [].
 1178
 1179can_be_autoloaded -->
 1180    { catch(http_link_to_id(pldoc_man, [section(autoload)], HREF),
 1181            error(_,_), fail)
 1182    },
 1183    html(['(can be ', a(href(HREF), autoloaded), ')']).
 1184can_be_autoloaded -->
 1185    html('(can be autoloaded)').
 unquote_filespec(+Spec, -Unquoted) is det
Translate e.g. library('semweb/rdf_db') into library(semweb/rdf_db).
 1193unquote_filespec(Spec, Unquoted) :-
 1194    compound(Spec),
 1195    Spec =.. [Alias,Path],
 1196    atom(Path),
 1197    atomic_list_concat(Parts, /, Path),
 1198    maplist(need_no_quotes, Parts),
 1199    !,
 1200    parts_to_path(Parts, UnquotedPath),
 1201    Unquoted =.. [Alias, UnquotedPath].
 1202unquote_filespec(Spec, Spec).
 1203
 1204need_no_quotes(Atom) :-
 1205    format(atom(A), '~q', [Atom]),
 1206    \+ sub_atom(A, 0, _, _, '\'').
 1207
 1208parts_to_path([One], One) :- !.
 1209parts_to_path(List, More/T) :-
 1210    (   append(H, [T], List)
 1211    ->  parts_to_path(H, More)
 1212    ).
 1213
 1214
 1215		 /*******************************
 1216		 *             PRINT            *
 1217		 *******************************/
 doc_write_html(+Out:stream, +Title:atomic, +DOM) is det
Write HTML for the documentation page DOM using Title to Out.
 1223doc_write_html(Out, Title, Doc) :-
 1224    doc_page_dom(Title, Doc, DOM),
 1225    phrase(html(DOM), Tokens),
 1226    print_html_head(Out),
 1227    print_html(Out, Tokens).
 doc_page_dom(+Title, +Body, -DOM) is det
Create the complete HTML DOM from the Title and Body. It adds links to the style-sheet and javaScript files.
 1234doc_page_dom(Title, Body, DOM) :-
 1235    DOM = html([ head([ title(Title),
 1236			link([ rel(stylesheet),
 1237			       type('text/css'),
 1238			       href(location_by_id(pldoc_resource)+'pldoc.css')
 1239			     ]),
 1240			script([ src(location_by_id(pldoc_resource)+'pldoc.js'),
 1241				 type('text/javascript')
 1242			       ], [])
 1243		      ]),
 1244		 body(Body)
 1245	       ]).
 print_html_head(+Out:stream) is det
Print the DOCTYPE line.
 1251print_html_head(Out) :-
 1252    format(Out,
 1253	   '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" \c
 1254	       "http://www.w3.org/TR/html4/strict.dtd">~n', []).
 1255
 1256% Rendering rules
 1257%
 1258% These rules translate \-terms produced by wiki.pl
 tags(+Tags)// is det
Emit the @tag tags of a description. Tags is produced by tags/3.
See also
- combine_tags/2.
 1266tags(Tags) -->
 1267    html(dl(class=tags, Tags)).
 tag(+Tag, +Values:list)// is det
Called from \tag(Name, Values) terms produced by doc_wiki.pl.
 1273tag(Tag, Values) -->
 1274    {   doc_tag_title(Tag, Title),
 1275	atom_concat('keyword-', Tag, Class)
 1276    },
 1277    html([ dt(class=Class, Title),
 1278	   \tag_values(Values, Class)
 1279	 ]).
 1280
 1281tag_values([], _) -->
 1282    [].
 1283tag_values([H|T], Class) -->
 1284    html(dd(class=Class, ['- '|H])),
 1285    tag_values(T, Class).
 doc_tag_title(+Tag, -Title) is det
Title is the name to use for Tag in the generated documentation.
 1292doc_tag_title(Tag, Title) :-
 1293    tag_title(Tag, Title),
 1294    !.
 1295doc_tag_title(Tag, Tag).
 1296
 1297tag_title(compat, 'Compatibility').
 1298tag_title(tbd,    'To be done').
 1299tag_title(see,    'See also').
 1300tag_title(error,  'Errors').
 1301tag_title(since,  'Since').
 args(+Params:list) is det
Called from \args(List) created by doc_wiki.pl. Params is a list of arg(Name, Descr).
 1308args(Params) -->
 1309    html([ dt(class=tag, 'Arguments:'),
 1310	   dd(table(class=arglist,
 1311		    \arg_list(Params)))
 1312	 ]).
 1313
 1314arg_list([]) -->
 1315    [].
 1316arg_list([H|T]) -->
 1317    argument(H),
 1318    arg_list(T).
 1319
 1320argument(arg(Name,Descr)) -->
 1321    html(tr([td(var(Name)), td(class=argdescr, ['- '|Descr])])).
 1322
 1323
 1324		 /*******************************
 1325		 *         NAVIGATION TREE      *
 1326		 *******************************/
 objects_nav_tree(+Objects, -Tree) is det
Provide a navigation tree showing the context of Object. Tree is of the form node(Object, Children).
 1333objects_nav_tree(Objects, Tree) :-
 1334    maplist(object_nav_tree, Objects, Trees),
 1335    union_trees(Trees, Tree0),
 1336    remove_unique_root(Tree0, Tree).
 1337
 1338object_nav_tree(Obj, Tree) :-
 1339    Node = node(directory(Dir), FileNodes),
 1340    FileNode = node(file(File), Siblings),
 1341    doc_comment(Obj, File:_Line, _Summary, _Comment),
 1342    !,
 1343    file_directory_name(File, Dir),
 1344    sibling_file_nodes(Dir, FileNodes0),
 1345    selectchk(node(file(File),[]), FileNodes0, FileNode, FileNodes),
 1346    findall(Sibling, doc_comment(Sibling, File:_, _, _), Siblings0),
 1347    delete(Siblings0, _:module(_), Siblings1),
 1348    doc_hide_private(Siblings1, Siblings2, []),
 1349    flatten(Siblings2, Siblings),   % a comment may describe objects
 1350    embed_directories(Node, Tree).
 1351
 1352sibling_file_nodes(Dir, Nodes) :-
 1353    findall(node(file(File), []),
 1354	    (   source_file(File),
 1355		file_directory_name(File, Dir)
 1356	    ),
 1357	    Nodes).
 1358
 1359embed_directories(Node, Tree) :-
 1360    Node = node(file(File), _),
 1361    !,
 1362    file_directory_name(File, Dir),
 1363    Super = node(directory(Dir), [Node]),
 1364    embed_directories(Super, Tree).
 1365embed_directories(Node, Tree) :-
 1366    Node = node(directory(Dir), _),
 1367    file_directory_name(Dir, SuperDir),
 1368    SuperDir \== Dir,
 1369    !,
 1370    Super = node(directory(SuperDir), [Node]),
 1371    embed_directories(Super, Tree).
 1372embed_directories(Tree, Tree).
 1373
 1374
 1375union_trees([Tree], Tree) :- !.
 1376union_trees([T1,T2|Trees], Tree) :-
 1377    merge_trees(T1, T2, M1),
 1378    union_trees([M1|Trees], Tree).
 1379
 1380merge_trees(node(R, Ch1), node(R, Ch2), node(R, Ch)) :-
 1381    merge_nodes(Ch1, Ch2, Ch).
 1382
 1383merge_nodes([], Ch, Ch) :- !.
 1384merge_nodes(Ch, [], Ch) :- !.
 1385merge_nodes([node(Root, Ch1)|T1], N1, [T1|Nodes]) :-
 1386    selectchk(node(Root, Ch2), N1, N2),
 1387    !,
 1388    merge_trees(node(Root, Ch1), node(Root, Ch2), T1),
 1389    merge_nodes(T1, N2, Nodes).
 1390merge_nodes([Node|T1], N1, [Node|Nodes]) :-
 1391    merge_nodes(T1, N1, Nodes).
 remove_unique_root(+TreeIn, -Tree)
Remove the root part that does not branch
 1397remove_unique_root(node(_, [node(R1, [R2])]), Tree) :-
 1398    !,
 1399    remove_unique_root(node(R1, [R2]), Tree).
 1400remove_unique_root(Tree, Tree).
 nav_tree(+Tree, +Current, +Options)// is det
Render the navigation tree
 1406nav_tree(Tree, Current, Options) -->
 1407    html(ul(class(nav),
 1408	    \object_tree(Tree, Current, Options))).
 object_tree(+Tree, +Current, +Options)// is det
Render a tree of objects used for navigation.
 1414object_tree(node(Id, []), Target, Options) -->
 1415    !,
 1416    { node_class(Id, Target, Class) },
 1417    html(li(class(Class),
 1418	    \node(Id, Options))).
 1419object_tree(node(Id, Children), Target, Options) -->
 1420    !,
 1421    { node_class(Id, Target, Class) },
 1422    html(li(class(Class),
 1423	    [ \node(Id, Options),
 1424	      ul(class(nav),
 1425		 \object_trees(Children, Target, Options))
 1426	    ])).
 1427object_tree(Id, Target, Options) -->
 1428    !,
 1429    { node_class(Id, Target, Class) },
 1430    html(li(class([obj|Class]), \node(Id, Options))).
 1431
 1432object_trees([], _, _) --> [].
 1433object_trees([H|T], Target, Options) -->
 1434    object_tree(H, Target, Options),
 1435    object_trees(T, Target, Options).
 1436
 1437node_class(Ids, Current, Class) :-
 1438    is_list(Ids),
 1439    !,
 1440    (   member(Id, Ids), memberchk(Id, Current)
 1441    ->  Class = [nav,current]
 1442    ;   Class = [nav]
 1443    ).
 1444node_class(Id, Current, Class) :-
 1445    (   memberchk(Id, Current)
 1446    ->  Class = [nav,current]
 1447    ;   Class = [nav]
 1448    ).
 1449
 1450node(file(File), Options) -->
 1451    !,
 1452    object_ref(file(File), [style(title)|Options]).
 1453node(Id, Options) -->
 1454    object_ref(Id, Options).
 1455
 1456
 1457		 /*******************************
 1458		 *            SECTIONS          *
 1459		 *******************************/
 1460
 1461section(Type, Title) -->
 1462    { string_codes(Title, Codes),
 1463      wiki_codes_to_dom(Codes, [], Content0),
 1464      strip_leading_par(Content0, Content),
 1465      make_section(Type, Content, HTML)
 1466    },
 1467    html(HTML).
 1468
 1469make_section(module,  Title, h1(class=module,  Title)).
 1470make_section(section, Title, h1(class=section, Title)).
 1471
 1472
 1473		 /*******************************
 1474		 *       PRED MODE HEADER       *
 1475		 *******************************/
 pred_dt(+Modes, +Class, Options)// is det
Emit the predicate header.
Arguments:
Modes- List as returned by process_modes/5.
 1483pred_dt(Modes, Class, Options) -->
 1484    pred_dt(Modes, Class, [], _Done, Options).
 1485
 1486pred_dt([], _, Done, Done, _) -->
 1487    [].
 1488pred_dt([H|T], Class, Done0, Done, Options) -->
 1489    { functor(Class, CSSClass, _) },
 1490    html(dt(class=CSSClass,
 1491	    [ \pred_mode(H, Done0, Done1, Options),
 1492	      \mode_anot(Class)
 1493	    ])),
 1494    pred_dt(T, Class, Done1, Done, Options).
 1495
 1496mode_anot(privdef) -->
 1497    !,
 1498    html(span([class(anot), style('float:right')],
 1499	      '[private]')).
 1500mode_anot(multidef(object(Obj))) -->
 1501    !,
 1502    { object_href(Obj, HREF) },
 1503    html(span([class(anot), style('float:right')],
 1504	      ['[', a(href(HREF), multifile), ']'
 1505	      ])).
 1506mode_anot(multidef(file(File:_))) -->
 1507    !,
 1508    { file_name_on_path(File, Spec),
 1509      unquote_filespec(Spec, Unquoted),
 1510      doc_file_href(File, HREF)
 1511    },
 1512    html(span([class(anot), style('float:right')],
 1513	      ['[multifile, ', a(href(HREF), '~q'-[Unquoted]), ']'
 1514	      ])).
 1515mode_anot(multidef) -->
 1516    !,
 1517    html(span([class(anot), style('float:right')],
 1518	      '[multifile]')).
 1519mode_anot(_) -->
 1520    [].
 1521
 1522pred_mode(mode(Head,Vars), Done0, Done, Options) -->
 1523    !,
 1524    { bind_vars(Head, Vars) },
 1525    pred_mode(Head, Done0, Done, Options).
 1526pred_mode(Head is Det, Done0, Done, Options) -->
 1527    !,
 1528    anchored_pred_head(Head, Done0, Done, Options),
 1529    pred_det(Det).
 1530pred_mode(Head, Done0, Done, Options) -->
 1531    anchored_pred_head(Head, Done0, Done, Options).
 1532
 1533bind_vars(Term, Bindings) :-
 1534    bind_vars(Bindings),
 1535    anon_vars(Term).
 1536
 1537bind_vars([]).
 1538bind_vars([Name=Var|T]) :-
 1539    Var = '$VAR'(Name),
 1540    bind_vars(T).
 anon_vars(+Term) is det
Bind remaining variables in Term to '$VAR'('_'), so they are printed as '_'.
 1547anon_vars(Var) :-
 1548    var(Var),
 1549    !,
 1550    Var = '$VAR'('_').
 1551anon_vars(Term) :-
 1552    compound(Term),
 1553    !,
 1554    Term =.. [_|Args],
 1555    maplist(anon_vars, Args).
 1556anon_vars(_).
 1557
 1558
 1559anchored_pred_head(Head, Done0, Done, Options) -->
 1560    { pred_anchor_name(Head, PI, Name) },
 1561    (   { memberchk(PI, Done0) }
 1562    ->  { Done = Done0 },
 1563	pred_head(Head)
 1564    ;   html([ span(style('float:right'),
 1565		    [ \pred_edit_or_source_button(Head, Options),
 1566		      &(nbsp)
 1567		    ]),
 1568	       a(name=Name, \pred_head(Head))
 1569	     ]),
 1570	{ Done = [PI|Done0] }
 1571    ).
 1572
 1573
 1574pred_edit_or_source_button(Head, Options) -->
 1575    { option(edit(true), Options) },
 1576    !,
 1577    pred_edit_button(Head, Options).
 1578pred_edit_or_source_button(Head, Options) -->
 1579    { option(source_link(true), Options) },
 1580    !,
 1581    pred_source_button(Head, Options).
 1582pred_edit_or_source_button(_, _) --> [].
 pred_edit_button(+PredIndicator, +Options)// is det
Create a button for editing the given predicate. Options processed:
module(M)
Resolve to module M
file(F)
For multi-file predicates: link to version in file.
line(L)
Line to edit (in file)
 1596pred_edit_button(_, Options) -->
 1597    { \+ option(edit(true), Options) },
 1598    !.
 1599pred_edit_button(PI0, Options0) -->
 1600    { canonicalise_predref(PI0, PI, Options0, Options) },
 1601    pred_edit_button2(PI, Options).
 1602
 1603pred_edit_button2(Name/Arity, Options) -->
 1604    { \+ ( memberchk(file(_), Options), % always edit if file and line
 1605	   memberchk(line(_), Options)  % are given.
 1606	 ),
 1607      functor(Head, Name, Arity),
 1608      option(module(M), Options, _),
 1609      \+ ( current_module(M),
 1610	   source_file(M:Head, _File)
 1611	 )
 1612    },
 1613    !.
 1614pred_edit_button2(Name/Arity, Options) -->
 1615    { include(edit_param, Options, Extra),
 1616      http_link_to_id(pldoc_edit,
 1617		      [name(Name),arity(Arity)|Extra],
 1618		      EditHREF)
 1619    },
 1620    html(a(onClick('HTTPrequest(\'' + EditHREF + '\')'),
 1621	   img([ class(action),
 1622		 alt('Edit predicate'),
 1623		 title('Edit predicate'),
 1624		 src(location_by_id(pldoc_resource)+'editpred.png')
 1625	       ]))).
 1626pred_edit_button2(_, _) -->
 1627    !,
 1628    [].
 1629
 1630edit_param(module(_)).
 1631edit_param(file(_)).
 1632edit_param(line(_)).
 object_edit_button(+Object, +Options)// is det
Create a button for editing Object.
 1639object_edit_button(_, Options) -->
 1640    { \+ option(edit(true), Options) },
 1641    !.
 1642object_edit_button(PI, Options) -->
 1643    { is_pi(PI) },
 1644    !,
 1645    pred_edit_button(PI, Options).
 1646object_edit_button(_, _) -->
 1647    [].
 pred_source_button(+PredIndicator, +Options)// is det
Create a button for viewing the source of a predicate.
 1654pred_source_button(PI0, Options0) -->
 1655    { canonicalise_predref(PI0, PI, Options0, Options),
 1656      option(module(M), Options, _),
 1657      pred_source_href(PI, M, HREF), !
 1658    },
 1659    html(a([ href(HREF),
 1660             class(source)
 1661	   ],
 1662	   img([ class(action),
 1663		 alt('Source'),
 1664		 title('Show source'),
 1665		 src(location_by_id(pldoc_resource)+'source.png')
 1666	       ]))).
 1667pred_source_button(_, _) -->
 1668    [].
 object_source_button(+Object, +Options)// is det
Create a button for showing the source of Object.
 1675object_source_button(PI, Options) -->
 1676    { is_pi(PI),
 1677      option(source_link(true), Options, true)
 1678    },
 1679    !,
 1680    pred_source_button(PI, Options).
 1681object_source_button(_, _) -->
 1682    [].
 canonicalise_predref(+PredRef, -PI:Name/Arity, +Options0, -Options) is det
Canonicalise a predicate reference. A possible module qualifier is added as module(M) to Options.
 1690canonicalise_predref(M:PI0, PI, Options0, [module(M)|Options]) :-
 1691    !,
 1692    canonicalise_predref(PI0, PI, Options0, Options).
 1693canonicalise_predref(//(Head), PI, Options0, Options) :-
 1694    !,
 1695    functor(Head, Name, Arity),
 1696    PredArity is Arity + 2,
 1697    canonicalise_predref(Name/PredArity, PI, Options0, Options).
 1698canonicalise_predref(Name//Arity, PI, Options0, Options) :-
 1699    integer(Arity), Arity >= 0,
 1700    !,
 1701    PredArity is Arity + 2,
 1702    canonicalise_predref(Name/PredArity, PI, Options0, Options).
 1703canonicalise_predref(PI, PI, Options, Options) :-
 1704    PI = Name/Arity,
 1705    atom(Name), integer(Arity), Arity >= 0,
 1706    !.
 1707canonicalise_predref(Head, PI, Options0, Options) :-
 1708    functor(Head, Name, Arity),
 1709    canonicalise_predref(Name/Arity, PI, Options0, Options).
 pred_head(+Term) is det
Emit a predicate head. The functor is typeset as a span using class pred and the arguments and var using class arglist.
 1717pred_head(Var) -->
 1718    { var(Var),
 1719      !,
 1720      instantiation_error(Var)
 1721    }.
 1722pred_head(//(Head)) -->
 1723    !,
 1724    pred_head(Head),
 1725    html(//).
 1726pred_head(M:Head) -->
 1727    html([span(class=module, M), :]),
 1728    pred_head(Head).
 1729pred_head(Head) -->
 1730    { atom(Head) },
 1731    !,
 1732    html(b(class=pred, Head)).
 1733pred_head(Head) -->                     % Infix operators
 1734    { Head =.. [Functor,Left,Right],
 1735      is_op_type(Functor, infix)
 1736    },
 1737    !,
 1738    html([ var(class=arglist, \pred_arg(Left, 1)),
 1739	   ' ', b(class=pred, Functor), ' ',
 1740	   var(class=arglist, \pred_arg(Right, 2))
 1741	 ]).
 1742pred_head(Head) -->                     % Prefix operators
 1743    { Head =.. [Functor,Arg],
 1744      is_op_type(Functor, prefix)
 1745    },
 1746    !,
 1747    html([ b(class=pred, Functor), ' ',
 1748	   var(class=arglist, \pred_arg(Arg, 1))
 1749	 ]).
 1750pred_head(Head) -->                     % Postfix operators
 1751    { Head =.. [Functor,Arg],
 1752      is_op_type(Functor, postfix)
 1753    },
 1754    !,
 1755    html([ var(class=arglist, \pred_arg(Arg, 1)),
 1756	   ' ', b(class=pred, Functor)
 1757	 ]).
 1758pred_head({Head}) -->
 1759    !,
 1760    html([ b(class=pred, '{'),
 1761	   var(class=arglist,
 1762	       \pred_args([Head], 1)),
 1763	   b(class=pred, '}')
 1764	 ]).
 1765pred_head(Head) -->                     % Plain terms
 1766    { Head =.. [Functor|Args] },
 1767    html([ b(class=pred, Functor),
 1768	   var(class=arglist,
 1769	       [ '(', \pred_args(Args, 1), ')' ])
 1770	 ]).
 is_op_type(+Atom, ?Type)
True if Atom is an operator of Type. Type is one of prefix, infix or postfix.
 1777is_op_type(Functor, Type) :-
 1778    current_op(_Pri, F, Functor),
 1779    op_type(F, Type).
 1780
 1781op_type(fx,  prefix).
 1782op_type(fy,  prefix).
 1783op_type(xf,  postfix).
 1784op_type(yf,  postfix).
 1785op_type(xfx, infix).
 1786op_type(xfy, infix).
 1787op_type(yfx, infix).
 1788op_type(yfy, infix).
 1789
 1790
 1791pred_args([], _) -->
 1792    [].
 1793pred_args([H|T], I) -->
 1794    pred_arg(H, I),
 1795    (   {T==[]}
 1796    ->  []
 1797    ;   html(', '),
 1798	{ I2 is I + 1 },
 1799	pred_args(T, I2)
 1800    ).
 1801
 1802pred_arg(Var, I) -->
 1803    { var(Var) },
 1804    !,
 1805    html(['Arg', I]).
 1806pred_arg(...(Term), I) -->
 1807    !,
 1808    pred_arg(Term, I),
 1809    html('...').
 1810pred_arg(Term, I) -->
 1811    { Term =.. [Ind,Arg],
 1812      mode_indicator(Ind)
 1813    },
 1814    !,
 1815    html([Ind, \pred_arg(Arg, I)]).
 1816pred_arg(Arg:Type, _) -->
 1817    !,
 1818    html([\argname(Arg), :, \argtype(Type)]).
 1819pred_arg(Arg, _) -->
 1820    argname(Arg).
 1821
 1822argname('$VAR'(Name)) -->
 1823    !,
 1824    html(Name).
 1825argname(Name) -->
 1826    !,
 1827    html(Name).
 1828
 1829argtype(Term) -->
 1830    { format(string(S), '~W',
 1831	     [ Term,
 1832	       [ quoted(true),
 1833		 numbervars(true)
 1834	       ]
 1835	     ]) },
 1836    html(S).
 1837
 1838pred_det(unknown) -->
 1839    [].
 1840pred_det(Det) -->
 1841    html([' is ', b(class=det, Det)]).
 term(+Text, +Term, +Bindings)// is det
Process the \term element as produced by doc_wiki.pl.
To be done
- Properly merge with pred_head//1
 1850term(_, Atom, []) -->
 1851    { atomic(Atom),
 1852      !,
 1853      format(string(S), '~W', [Atom,[quoted(true)]])
 1854    },
 1855    html(span(class=functor, S)).
 1856term(_, Key:Type, [TypeName=Type]) -->
 1857    { atomic(Key)
 1858    },
 1859    !,
 1860    html([span(class='pl-key', Key), :, span(class('pl-var'), TypeName)]).
 1861term(_, Term, Bindings) -->
 1862    { is_mode(Term is det),         % HACK. Bit too strict?
 1863      bind_vars(Bindings)
 1864    },
 1865    !,
 1866    pred_head(Term).
 1867term(_, Term, Bindings) -->
 1868    term(Term,
 1869	 [ variable_names(Bindings),
 1870	   quoued(true)
 1871	 ]).
 1872
 1873
 1874		 /*******************************
 1875		 *             PREDREF          *
 1876		 *******************************/
 predref(+PI)// is det
 predref(+PI, +Options)// is det
Create a reference to a predicate. The reference consists of the relative path to the file using the predicate indicator as anchor.

Current file must be available through the global variable pldoc_file. If this variable not set it creates a link to /doc/<file>#anchor. Such links only work in the online browser.

 1889predref(Term) -->
 1890    { catch(nb_getval(pldoc_options, Options), _, Options = []) },
 1891    predref(Term, Options).
 1892
 1893predref(Obj, Options) -->
 1894    { Obj = _:_,
 1895      doc_comment(Obj, File:_Line, _, _),
 1896      (   (   option(files(Map), Options)
 1897	  ->  memberchk(file(File,_), Map)
 1898	  ;   true
 1899	  )
 1900      ->  object_href(Obj, HREF, Options)
 1901      ;   manref(Obj, HREF, Options)
 1902      )
 1903    },
 1904    !,
 1905    html(a(href(HREF), \object_name(Obj, [qualify(true)|Options]))).
 1906predref(M:Term, Options) -->
 1907    !,
 1908    predref(Term, M, Options).
 1909predref(Term, Options) -->
 1910    predref(Term, _, Options).
 1911
 1912predref(Name/Arity, _, Options) -->             % Builtin; cannot be overruled
 1913    { prolog:doc_object_summary(Name/Arity, manual, _, _),
 1914      !,
 1915      manref(Name/Arity, HREF, Options)
 1916    },
 1917    html(a([class=builtin, href=HREF], [Name, /, Arity])).
 1918predref(Name/Arity, _, Options) -->             % From packages
 1919    { option(prefer(manual), Options),
 1920      prolog:doc_object_summary(Name/Arity, Category, _, _),
 1921      !,
 1922      manref(Name/Arity, HREF, Options)
 1923    },
 1924    html(a([class=Category, href=HREF], [Name, /, Arity])).
 1925predref(Obj, Module, Options) -->               % Local
 1926    { doc_comment(Module:Obj, File:_Line, _, _),
 1927      (   option(files(Map), Options)
 1928      ->  memberchk(file(File,_), Map)
 1929      ;   true
 1930      )
 1931    },
 1932    !,
 1933    object_ref(Module:Obj, Options).
 1934predref(Name/Arity, Module, Options) -->
 1935    { \+ option(files(_), Options),
 1936      pred_href(Name/Arity, Module, HREF)
 1937    },
 1938    !,
 1939    html(a(href=HREF, [Name, /, Arity])).
 1940predref(Name//Arity, Module, Options) -->
 1941    { \+ option(files(_), Options),
 1942      PredArity is Arity + 2,
 1943      pred_href(Name/PredArity, Module, HREF)
 1944    },
 1945    !,
 1946    html(a(href=HREF, [Name, //, Arity])).
 1947predref(PI, _, Options) -->             % From packages
 1948    { canonical_pi(PI, CPI, HTML),
 1949      (   option(files(_), Options)
 1950      ->  Category = extmanual
 1951      ;   prolog:doc_object_summary(CPI, Category, _, _)
 1952      ),
 1953      manref(CPI, HREF, Options)
 1954    },
 1955    html(a([class=Category, href=HREF], HTML)).
 1956predref(PI, _, _Options) -->
 1957    { canonical_pi(PI, _CPI, HTML)
 1958    },
 1959    !,
 1960    html(span(class=undef, HTML)).
 1961predref(Callable, Module, Options) -->
 1962    { callable(Callable),
 1963      functor(Callable, Name, Arity)
 1964    },
 1965    predref(Name/Arity, Module, Options).
 1966
 1967canonical_pi(Name/Arity, Name/Arity, [Name, /, Arity]) :-
 1968    atom(Name), integer(Arity),
 1969    !.
 1970canonical_pi(Name//Arity, Name/Arity2, [Name, //, Arity]) :-
 1971    atom(Name), integer(Arity),
 1972    !,
 1973    Arity2 is Arity+2.
 nopredref(+PI)//
Result of name/arity, non-linking predicate indicator.
 1979nopredref(PI) -->
 1980    { canonical_pi(PI, _CPI, HTML)
 1981    },
 1982    !,
 1983    html(span(class=nopredref, HTML)).
 flagref(+Flag)//
Reference to a Prolog flag.
To be done
- generate a link to the Prolog website?
 1991flagref(Flag) -->
 1992    html(code(Flag)).
 cite(+Citations)// is det
Emit citations. This is indented to allow for [@cite1;@cite2] for generating LaTex.
 1999cite(Citations) -->
 2000    html('['), citations(Citations), html(']').
 2001
 2002citations([]) --> [].
 2003citations([H|T]) -->
 2004    citation(H),
 2005    (   {T==[]}
 2006    ->  []
 2007    ;   [';'],
 2008	citations(T)
 2009    ).
 2010
 2011citation(H) -->
 2012    html([@,H]).
 manref(+NameArity, -HREF, +Options) is det
Create reference to a manual page. When generating files, this listens to the option man_server(+Server).
 2020manref(PI, HREF, Options) :-
 2021    predname(PI, PredName),
 2022    (   option(files(_Map), Options)
 2023    ->  option(man_server(Server), Options,
 2024	       'http://www.swi-prolog.org/pldoc'),
 2025	uri_components(Server, Comp0),
 2026	uri_data(path, Comp0, Path0),
 2027	directory_file_path(Path0, man, Path),
 2028	uri_data(path, Comp0, Path, Components),
 2029	uri_query_components(Query, [predicate=PredName]),
 2030	uri_data(search, Components, Query),
 2031	uri_components(HREF, Components)
 2032    ;   http_link_to_id(pldoc_man, [predicate=PredName], HREF)
 2033    ).
 2034
 2035predname(Name/Arity, PredName) :-
 2036    !,
 2037    format(atom(PredName), '~w/~d', [Name, Arity]).
 2038predname(Module:Name/Arity, PredName) :-
 2039    !,
 2040    format(atom(PredName), '~w:~w/~d', [Module, Name, Arity]).
 pred_href(+NameArity, +Module, -HREF) is semidet
Create reference. Prefer:
  1. Local definition
  2. If from package and documented: package documentation
  3. From any file
bug
- Should analyse import list to find where the predicate comes from.
 2054pred_href(Name/Arity, Module, HREF) :-
 2055    format(string(FragmentId), '~w/~d', [Name, Arity]),
 2056    uri_data(fragment, Components, FragmentId),
 2057    functor(Head, Name, Arity),
 2058    (   catch(relative_file(Module:Head, File), _, fail)
 2059    ->  uri_data(path, Components, File),
 2060	uri_components(HREF, Components)
 2061    ;   in_file(Module:Head, File)
 2062    ->  (   current_prolog_flag(home, SWI),
 2063	    sub_atom(File, 0, _, _, SWI),
 2064	    prolog:doc_object_summary(Name/Arity, packages, _, _)
 2065	->  http_link_to_id(pldoc_man, [predicate=FragmentId], HREF)
 2066	;   http_location_by_id(pldoc_doc, DocHandler),
 2067	    atom_concat(DocHandler, File, Path),
 2068	    uri_data(path, Components, Path),
 2069	    uri_components(HREF, Components)
 2070	)
 2071    ).
 2072
 2073relative_file(Head, '') :-
 2074    b_getval(pldoc_file, CurrentFile), CurrentFile \== [],
 2075    in_file(Head, CurrentFile),
 2076    !.
 2077relative_file(Head, RelFile) :-
 2078    b_getval(pldoc_file, CurrentFile), CurrentFile \== [],
 2079    in_file(Head, DefFile),
 2080    relative_file_name(DefFile, CurrentFile, RelFile).
 pred_source_href(+Pred:predicate_indicator, +Module, -HREF) is semidet
HREF is a URL to show the predicate source in its file.
 2086pred_source_href(Name/Arity, Module, HREF) :-
 2087    format(string(FragmentId), '~w/~d', [Name, Arity]),
 2088    uri_data(fragment, Components, FragmentId),
 2089    uri_query_components(Query, [show=src]),
 2090    uri_data(search, Components, Query),
 2091    functor(Head, Name, Arity),
 2092    (   catch(relative_file(Module:Head, File), _, fail)
 2093    ->  uri_data(path, Components, File),
 2094	uri_components(HREF, Components)
 2095    ;   in_file(Module:Head, File0)
 2096    ->  insert_alias(File0, File),
 2097	http_location_by_id(pldoc_doc, DocHandler),
 2098	atom_concat(DocHandler, File, Path),
 2099	uri_data(path, Components, Path),
 2100	uri_components(HREF, Components)
 2101    ).
 object_ref(+Object, +Options)// is det
Create a hyperlink to Object. Points to the /doc_for URL. Object is as the first argument of doc_comment/4. Note this can be a list of objects.
 2110object_ref([], _) -->
 2111    !,
 2112    [].
 2113object_ref([H|T], Options) -->
 2114    !,
 2115    object_ref(H, Options),
 2116    (   {T == []}
 2117    ->  html(', '),
 2118	object_ref(T, Options)
 2119    ;   []
 2120    ).
 2121object_ref(Obj, Options) -->
 2122    { object_href(Obj, HREF, Options)
 2123    },
 2124    html(a(href(HREF), \object_name(Obj, Options))).
 object_href(+Object, -HREF) is det
 object_href(+Object, -HREF, +Options) is det
HREF is the URL to access Object.
 2131object_href(Obj, HREF) :-
 2132    object_href(Obj, HREF, []).
 2133
 2134object_href(M:PI0, HREF, Options) :-
 2135    option(files(Map), Options),
 2136    (   module_property(M, file(File))
 2137    ->  true
 2138    ;   xref_module(File, M)
 2139    ),
 2140    memberchk(file(File, DocFile), Map),
 2141    !,
 2142    file_base_name(DocFile, LocalFile),     % TBD: proper directory index
 2143    expand_pi(PI0, PI),
 2144    term_to_string(PI, PIS),
 2145    uri_data(path, Components, LocalFile),
 2146    uri_data(fragment, Components, PIS),
 2147    uri_components(HREF, Components).
 2148object_href(file(File), HREF, _Options) :-
 2149    doc_file_href(File, HREF),
 2150    !.
 2151object_href(directory(Dir), HREF, _Options) :-
 2152    directory_file_path(Dir, 'index.html', Index),
 2153    doc_file_href(Index, HREF),
 2154    !.
 2155object_href(Obj, HREF, _Options) :-
 2156    prolog:doc_object_href(Obj, HREF),
 2157    !.
 2158object_href(Obj0, HREF, _Options) :-
 2159    localise_object(Obj0, Obj),
 2160    term_to_string(Obj, String),
 2161    http_link_to_id(pldoc_object, [object=String], HREF).
 2162
 2163expand_pi(Name//Arity0, Name/Arity) :-
 2164    !,
 2165    Arity is Arity0+2.
 2166expand_pi(PI, PI).
 localise_object(+ObjIn, -ObjOut) is det
Abstract path-details to make references more stable over versions.
 2174localise_object(Obj0, Obj) :-
 2175    prolog:doc_canonical_object(Obj0, Obj),
 2176    !.
 2177localise_object(Obj, Obj).
 term_to_string(+Term, -String) is det
Convert Term, possibly holding variables, into a canonical string using A, B, ... for variables and _ for singletons.
 2185term_to_string(Term, String) :-
 2186    State = state(-),
 2187    (   numbervars(Term, 0, _, [singletons(true)]),
 2188	with_output_to(string(String),
 2189		       write_term(Term,
 2190				  [ numbervars(true),
 2191				    quoted(true)
 2192				  ])),
 2193	nb_setarg(1, State, String),
 2194	fail
 2195    ;   arg(1, State, String)
 2196    ).
 object_name(+Obj, +Options)// is det
HTML description of documented Obj. Obj is as the first argument of doc_comment/4. Options:
style(+Style)
One of inline or title
qualify(+Boolean)
Qualify predicates by their module
secref_style(Style)
One of number, title or number_title
 2210object_name(Obj, Options) -->
 2211    { option(style(Style), Options, inline)
 2212    },
 2213    object_name(Style, Obj, Options).
 2214
 2215object_name(title, Obj, Options) -->
 2216    { merge_options(Options, [secref_style(title)], Options1) },
 2217    prolog:doc_object_link(Obj, Options1),
 2218    !.
 2219object_name(inline, Obj, Options) -->
 2220    prolog:doc_object_link(Obj, Options),
 2221    !.
 2222object_name(title, f(Name/Arity), _Options) -->
 2223    !,
 2224    html(['Function ', Name, /, Arity]).
 2225object_name(inline, f(Name/Arity), _Options) -->
 2226    !,
 2227    html([Name, /, Arity]).
 2228object_name(Style, PI, Options) -->
 2229    { is_pi(PI) },
 2230    !,
 2231    pi(Style, PI, Options).
 2232object_name(inline, Module:module(_Title), _) -->
 2233    !,
 2234    { module_property(Module, file(File)),
 2235      file_base_name(File, Base)
 2236    },
 2237    !,
 2238    html(Base).
 2239object_name(title, Module:module(Title), _) -->
 2240    { module_property(Module, file(File)),
 2241      file_base_name(File, Base)
 2242    },
 2243    !,
 2244    html([Base, ' -- ', Title]).
 2245object_name(title, file(File), _) -->
 2246    { module_property(Module, file(File)),
 2247      doc_comment(Module:module(Title), _, _, _),
 2248      !,
 2249      file_base_name(File, Base)
 2250    },
 2251    html([Base, ' -- ', Title]).
 2252object_name(_, file(File), _) -->
 2253    { file_base_name(File, Base) },
 2254    html(Base).
 2255object_name(_, directory(Dir), _) -->
 2256    { file_base_name(Dir, Base) },
 2257    html(Base).
 2258object_name(_, module(Title), _Options) -->
 2259    { print_message(warning,
 2260		    pldoc(module_comment_outside_module(Title)))
 2261    }.
 2262
 2263pi(title, PI, Options) -->
 2264    pi_type(PI),
 2265    pi(PI, Options).
 2266pi(inline, PI, Options) -->
 2267    pi(PI, Options).
 2268
 2269pi(M:PI, Options) -->
 2270    !,
 2271    (   { option(qualify(true), Options) }
 2272    ->  html([span(class(module), M), :])
 2273    ;   []
 2274    ),
 2275    pi(PI, Options).
 2276pi(Name/Arity, _) -->
 2277    !,
 2278    html([Name, /, \arity(Arity)]).
 2279pi(Name//Arity, _) -->
 2280    html([Name, //, \arity(Arity)]).
 2281
 2282arity(Arity) -->
 2283    { var(Arity) },
 2284    !,
 2285    html('_').
 2286arity(Arity) -->
 2287    html(Arity).
 2288
 2289pi_type(_:PI) -->
 2290    !,
 2291    pi_type(PI).
 2292pi_type(_/_) -->
 2293    html(['Predicate ']).
 2294pi_type(_//_) -->
 2295    html(['Grammar rule ']).
 in_file(+Head, ?File) is nondet
File is the name of a file containing the Predicate Head. Head may be qualified with a module.
To be done
- Prefer local, then imported, then `just anywhere'
- Look for documented and/or public predicates.
 2307in_file(Module:Head, File) :-
 2308    !,
 2309    distinct(File, in_file(Module, Head, File)).
 2310in_file(Head, File) :-
 2311    distinct(File, in_file(_, Head, File)).
 2312
 2313in_file(Module, Head, File) :-
 2314    var(Module),
 2315    (   predicate_property(system:Head, foreign)
 2316    ->  !,
 2317	fail
 2318    ;   predicate_property(system:Head, file(File)),
 2319	\+ system_arithmetic_function(Head)
 2320    ->  !
 2321    ;   predicate_property(Head, autoload(File0))
 2322    ->  !,
 2323	file_name_extension(File0, pl, File)
 2324    ;   exported_from(Module, Head, File),
 2325	module_property(Module, class(library))
 2326    ).
 2327in_file(Module, Head, File) :-
 2328    nonvar(Module),
 2329    predicate_property(Module:Head, file(File)),
 2330    \+ predicate_property(Module:Head, imported_from(_)).
 2331in_file(Module, Head, File) :-
 2332    xref_defined(File, Head, How),
 2333    xref_current_source(File),
 2334    atom(File),                     % only plain files
 2335    xref_module(File, Module),
 2336    How \= imported(_From).
 2337in_file(Module, Head, File) :-
 2338    exported_from(Module, Head, File).
 2339in_file(Module, Head, File) :-
 2340    predicate_property(Module:Head, file(File)),
 2341    \+ predicate_property(Module:Head, imported_from(_)).
 2342in_file(Module, Head, File) :-
 2343    current_module(Module),
 2344    source_file(Module:Head, File).
 2345
 2346exported_from(Module, Head, File) :-
 2347    distinct(Primary,
 2348	     (   predicate_property(Module:Head, exported),
 2349		 (   predicate_property(Module:Head, imported_from(Primary))
 2350		 ->  true
 2351		 ;   Primary = Module
 2352		 ))),
 2353    module_property(Primary, file(File)).
 2354
 2355:- multifile
 2356    arithmetic:evaluable/2. 2357
 2358system_arithmetic_function(Head) :-
 2359    functor(Head, Name, Arity),
 2360    FArith is Arity-1,
 2361    FArith >= 0,
 2362    functor(FHead, Name, FArith),
 2363    arithmetic:evaluable(FHead, system).
 file(+FileName)// is det
 file(+FileName, +Options)// is det
Create a link to another filename if the file exists. Called by \file(File) terms in the DOM term generated by wiki.pl. Supported options are:
label(+Label)
Label to use for the link to the file.
absolute_path(+Path)
Absolute location of the referenced file.
href(+HREF)
Explicitely provided link; overrule link computation.
map_extension(+Pairs)
Map the final extension if OldExt-NewExt is in Pairs.
files(+Map)
List of file(Name, Link) that specifies that we must user Link for the given physical file Name.
edit_handler(+Id)
HTTP handler Id to call if the user clicks the edit button.
To be done
- Translation of files to HREFS is a mess. How to relate these elegantly?
 2394file(File) -->
 2395    file(File, []).
 2396
 2397file(File, Options) -->
 2398    { catch(nb_getval(pldoc_options, GenOptions), _, GenOptions = []),
 2399      merge_options(Options, GenOptions, FinalOptions)
 2400    },
 2401    link_file(File, FinalOptions),
 2402    !.
 2403file(File, Options) -->
 2404    { option(edit_handler(Handler), Options),
 2405      http_current_request(Request),
 2406      memberchk(path(Path), Request),
 2407      absolute_file_name(File, Location,
 2408			 [ relative_to(Path)
 2409			 ]),
 2410      http_link_to_id(Handler, [location(Location)], HREF),
 2411      format(atom(Title), 'Click to create ~w', [File])
 2412    },
 2413    html(a([href(HREF), class(nofile), title(Title)], File)).
 2414file(File, _) -->
 2415    html(code(class(nofile), File)).
 2416
 2417link_file(File, Options) -->
 2418    { file_href(File, HREF, Options),
 2419      option(label(Label), Options, File),
 2420      option(class(Class), Options, file)
 2421    },
 2422    html(a([class(Class), href(HREF)], Label)).
 file_href(+FilePath, -HREF, +Options) is det
Find URL for refering to FilePath based on Options.
 2428file_href(_, HREF, Options) :-
 2429    option(href(HREF), Options),
 2430    !.
 2431file_href(File, HREF, Options) :-
 2432    file_href_real(File, HREF0, Options),
 2433    map_extension(HREF0, HREF, Options).
 map_extension(+HREFIn, -HREFOut, Options) is det
Replace extension using the option
 2441map_extension(HREF0, HREF, Options) :-
 2442    option(map_extension(Map), Options),
 2443    file_name_extension(Base, Old, HREF0),
 2444    memberchk(Old-New, Map),
 2445    !,
 2446    file_name_extension(Base, New, HREF).
 2447map_extension(HREF, HREF, _).
 2448
 2449
 2450file_href_real(File, HREF, Options) :-
 2451    (   option(absolute_path(Path), Options)
 2452    ;   existing_linked_file(File, Path)
 2453    ),
 2454    !,
 2455    (   option(files(Map), Options),
 2456	memberchk(file(Path, LinkFile), Map)
 2457    ->  true
 2458    ;   LinkFile = Path
 2459    ),
 2460    file_href(LinkFile, HREF).
 2461file_href_real(File, HREF, _) :-
 2462    directory_alias(Alias),
 2463    Term =.. [Alias,File],
 2464    absolute_file_name(Term, _,
 2465		       [ access(read),
 2466			 file_errors(fail)
 2467		       ]),
 2468    !,
 2469    http_absolute_location(Term, HREF, []).
 2470
 2471directory_alias(icons).
 2472directory_alias(css).
 file_href(+FilePath, -HREF) is det
Create a relative URL from the current location to the given absolute file name. It resolves the filename relative to the file being processed that is available through the global variable pldoc_file.
 2482file_href(Path, HREF) :-                % a loaded Prolog file
 2483    source_file(Path),
 2484    !,
 2485    doc_file_href(Path, HREF).
 2486file_href(Path, HREF) :-
 2487    (   nb_current(pldoc_output, CFile)
 2488    ;   nb_current(pldoc_file, CFile)
 2489    ),
 2490    CFile \== [],
 2491    !,
 2492    relative_file_name(Path, CFile, HREF).
 2493file_href(Path, Path).
 existing_linked_file(+File, -Path) is semidet
True if File is a path to an existing file relative to the current file. Path is the absolute location of File.
 2501existing_linked_file(File, Path) :-
 2502    catch(b_getval(pldoc_file, CurrentFile), _, fail),
 2503    CurrentFile \== [],
 2504    absolute_file_name(File, Path,
 2505		       [ relative_to(CurrentFile),
 2506			 access(read),
 2507			 file_errors(fail)
 2508		       ]).
 include(+FileName, +Type, +Options)// is det
Inline FileName. If this is an image file, show an inline image. Else we create a link like file//1. Called by \include(File, Type) terms in the DOM term generated by wiki.pl if it encounters [[file.ext]].
 2518include(PI, predicate, _) -->
 2519    !,
 2520    (   html_tokens_for_predicates(PI, [])
 2521    ->  []
 2522    ;   html(['[[', \predref(PI), ']]'])
 2523    ).
 2524include(File, image, Options) -->
 2525    { file_name_extension(_, svg, File),
 2526      file_href(File, HREF, Options),
 2527      !,
 2528      include(image_attribute, Options, Attrs0),
 2529      merge_options(Attrs0,
 2530		    [ alt(File),
 2531		      data(HREF),
 2532		      type('image/svg+xml')
 2533		    ], Attrs)
 2534    },
 2535    (   { option(caption(Caption), Options) }
 2536    ->  html(div(class(figure),
 2537		 [ div(class(image), object(Attrs, [])),
 2538		   div(class(caption), Caption)
 2539		 ]))
 2540    ;   html(object(Attrs, []))
 2541    ).
 2542include(File, image, Options) -->
 2543    { file_href(File, HREF, Options),
 2544      !,
 2545      include(image_attribute, Options, Attrs0),
 2546      merge_options(Attrs0,
 2547		    [ alt(File),
 2548		      border(0),
 2549		      src(HREF)
 2550		    ], Attrs)
 2551    },
 2552    (   { option(caption(Caption), Options) }
 2553    ->  html(div(class(figure),
 2554		 [ div(class(image), img(Attrs)),
 2555		   div(class(caption), Caption)
 2556		 ]))
 2557    ;   html(img(Attrs))
 2558    ).
 2559include(File, wiki, _Options) -->       % [[file.txt]] is included
 2560    { access_file(File, read),
 2561      !,
 2562      read_file_to_codes(File, String, []),
 2563      wiki_codes_to_dom(String, [], DOM)
 2564    },
 2565    html(DOM).
 2566include(File, _Type, Options) -->
 2567    link_file(File, Options),
 2568    !.
 2569include(File, _, _) -->
 2570    html(code(class(nofile), ['[[',File,']]'])).
 2571
 2572image_attribute(src(_)).
 2573image_attribute(alt(_)).
 2574image_attribute(title(_)).
 2575image_attribute(align(_)).
 2576image_attribute(width(_)).
 2577image_attribute(height(_)).
 2578image_attribute(border(_)).
 2579image_attribute(class(_)).
 2580image_attribute(style(_)).
 html_tokens_for_predicates(+PI, +Options)// is semidet
Inline description for a predicate as produced by the text below from wiki processing.
        * [[member/2]]
        * [[append/3]]
 2593html_tokens_for_predicates([], _Options) -->
 2594    [].
 2595html_tokens_for_predicates([H|T], Options) -->
 2596    !,
 2597    html_tokens_for_predicates(H, Options),
 2598    html_tokens_for_predicates(T, Options).
 2599html_tokens_for_predicates(PI, Options) -->
 2600    { PI = _:_/_,
 2601      !,
 2602      (   doc_comment(PI, Pos, _Summary, Comment)
 2603      ->  true
 2604      ;   Comment = ''
 2605      )
 2606    },
 2607    object(PI, [Pos-Comment], [dl], _, Options).
 2608html_tokens_for_predicates(Spec, Options) -->
 2609    { findall(PI, documented_pi(Spec, PI), List),
 2610      List \== [], !
 2611    },
 2612    html_tokens_for_predicates(List, Options).
 2613html_tokens_for_predicates(Spec, Options) -->
 2614    man_page(Spec,
 2615	     [ links(false),                % no header
 2616	       navtree(false),              % no navigation tree
 2617	       footer(false),               % no footer
 2618	       synopsis(false)              % no synopsis
 2619	     | Options
 2620	     ]).
 2621
 2622
 2623documented_pi(Spec, PI) :-
 2624    generalise_spec(Spec, PI),
 2625    doc_comment(PI, _Pos, _Summary, _Comment).
 2626
 2627generalise_spec(Name/Arity, _M:Name/Arity).
 2628generalise_spec(Name//Arity, _M:Name//Arity).
 2629
 2630
 2631		 /*******************************
 2632		 *           WIKI FILES         *
 2633		 *******************************/
 doc_for_wiki_file(+File, +Options) is det
Write HTML for the File containing wiki data.
 2640doc_for_wiki_file(FileSpec, Options) :-
 2641    absolute_file_name(FileSpec, File,
 2642		       [ access(read)
 2643		       ]),
 2644    read_file_to_codes(File, String, []),
 2645    b_setval(pldoc_file, File),
 2646    call_cleanup(reply_wiki_page(File, String, Options),
 2647		 nb_delete(pldoc_file)).
 2648
 2649reply_wiki_page(File, String, Options) :-
 2650    wiki_codes_to_dom(String, [], DOM0),
 2651    title(DOM0, File, Title),
 2652    insert_edit_button(DOM0, File, DOM, Options),
 2653    reply_html_page(pldoc(wiki),
 2654		    title(Title),
 2655		    [ \html_requires(pldoc)
 2656		    | DOM
 2657		    ]).
 2658
 2659title(DOM, _, Title) :-
 2660    sub_term(h1(_,Title), DOM),
 2661    !.
 2662title(_, File, Title) :-
 2663    file_base_name(File, Title).
 2664
 2665insert_edit_button(DOM, _, DOM, Options) :-
 2666    option(edit(false), Options, false),
 2667    !.
 2668insert_edit_button([h1(Attrs,Title)|DOM], File,
 2669		   [h1(Attrs,[ span(style('float:right'),
 2670				   \edit_button(File, [edit(true)]))
 2671			     | Title
 2672			     ])|DOM], _) :- !.
 2673insert_edit_button(DOM, File,
 2674		   [ h1(class(wiki),
 2675			[ span(style('float:right'),
 2676			       \edit_button(File, [edit(true)]))
 2677			])
 2678		   | DOM
 2679		   ], _).
 2680
 2681
 2682		 /*******************************
 2683		 *            ANCHORS           *
 2684		 *******************************/
 mode_anchor_name(+Mode, -Anchor:atom) is det
Get the anchor name for a mode.
 2690mode_anchor_name(Var, _) :-
 2691    var(Var),
 2692    !,
 2693    instantiation_error(Var).
 2694mode_anchor_name(mode(Head, _), Anchor) :-
 2695    !,
 2696    mode_anchor_name(Head, Anchor).
 2697mode_anchor_name(Head is _Det, Anchor) :-
 2698    !,
 2699    mode_anchor_name(Head, Anchor).
 2700mode_anchor_name(Head, Anchor) :-
 2701    pred_anchor_name(Head, _, Anchor).
 pred_anchor_name(+Head, -PI:atom/integer, -Anchor:atom) is det
Create an HTML anchor name from Head.
 2708pred_anchor_name(//(Head), Name/Arity, Anchor) :-
 2709    !,
 2710    functor(Head, Name, DCGArity),
 2711    Arity is DCGArity+2,
 2712    format(atom(Anchor), '~w/~d', [Name, Arity]).
 2713pred_anchor_name(Head, Name/Arity, Anchor) :-
 2714    functor(Head, Name, Arity),
 2715    format(atom(Anchor), '~w/~d', [Name, Arity]).
 2716
 2717:- multifile prolog:message//1. 2718
 2719prolog:message(pldoc(module_comment_outside_module(Title))) -->
 2720    [ 'PlDoc comment <module> ~w does not appear in a module'-[Title] ]