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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)  2006-2013, University of Amsterdam
    7                              VU University Amsterdam
    8    All rights reserved.
    9
   10    Redistribution and use in source and binary forms, with or without
   11    modification, are permitted provided that the following conditions
   12    are met:
   13
   14    1. Redistributions of source code must retain the above copyright
   15       notice, this list of conditions and the following disclaimer.
   16
   17    2. Redistributions in binary form must reproduce the above copyright
   18       notice, this list of conditions and the following disclaimer in
   19       the documentation and/or other materials provided with the
   20       distribution.
   21
   22    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   24    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   25    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   26    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   27    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   28    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   29    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   30    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   32    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   33    POSSIBILITY OF SUCH DAMAGE.
   34*/
   35
   36:- module(pldoc_register,
   37          [ process_stored_comments/0
   38          ]).   39:- use_module(doc_process).   40:- use_module(library(pldoc)).   41:- use_module(library(debug)).   42:- set_prolog_flag(generate_debug_info, false).   43
   44pldoc_module(pldoc_modes).              % avoid recursive behaviour
   45pldoc_module(pldoc_process).
   46pldoc_module(pldoc_wiki).
   47pldoc_module(pldoc).
   48pldoc_module(lists).
   49pldoc_module(apply).
   50pldoc_module(pairs).
   51
   52                 /*******************************
   53                 *            REGISTER          *
   54                 *******************************/
   55
   56:- multifile
   57    prolog:comment_hook/3,
   58    user:message_hook/3.   59
   60:- dynamic
   61    mydoc/3.                        %  +Comments, +TermPos, +File
   62
   63do_comment_hook(_, _, _, _) :-
   64    current_prolog_flag(pldoc_collecting, false),
   65    !.
   66do_comment_hook(Comments, TermPos, File, _) :-
   67    pldoc_loading,
   68    !,
   69    assert(mydoc(Comments, TermPos, File)).
   70do_comment_hook(Comments, TermPos, File, _Term) :-
   71    \+ current_prolog_flag(xref, true),
   72    prolog_load_context(module, Module),
   73    pldoc_module(Module),
   74    !,
   75    assert(mydoc(Comments, TermPos, File)).
   76do_comment_hook(Comments, TermPos, File, _) :-
   77    process_comments(Comments, TermPos, File).
   78
   79user:message_hook(load_file(done(0, _F, _A, _M, _T, _H)), _, _) :-
   80    (   mydoc(_, _, _)
   81    ->  debug(pldoc, 'Processing delayed comments', []),
   82        process_stored_comments
   83    ),
   84    fail.
   85
   86%!  prolog:comment_hook(+Comments, +TermPos, +Term) is det.
   87%
   88%   Hook called by the compiler and cross-referencer. In addition to
   89%   the comment, it passes the  term  itself   to  see  what term is
   90%   commented  as  well  as  the  start-position   of  the  term  to
   91%   distinguish between comments before the term and inside it.
   92%
   93%   @param Comments List of comments read before the end of Term
   94%   @param TermPos  Start location of Term
   95%   @param Term     Actual term read
   96
   97prolog:comment_hook(Comments, TermPos, Term) :-
   98    source_location(File, _TermLine),
   99    setup_call_cleanup(
  100        '$push_input_context'(pldoc),  % Preserve input file and line
  101        do_comment_hook(Comments, TermPos, File, Term),
  102        '$pop_input_context').
  103
  104process_stored_comments :-
  105    forall(retract(mydoc(Comments, TermPos, File)),
  106           delayed_process(Comments, TermPos, File)).
  107
  108delayed_process(Comments, TermPos, File) :-
  109    module_property(Module, file(File)),
  110    setup_call_cleanup(
  111        '$set_source_module'(Old, Module),
  112        process_comments(Comments, TermPos, File),
  113        '$set_source_module'(_, Old))