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)  1999-2015, 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(edinburgh,
   37          [ display/1,
   38            display/2,
   39            unknown/2,
   40            reconsult/1,
   41            debug/0,
   42            nodebug/0,
   43            fileerrors/2
   44          ]).   45
   46:- meta_predicate
   47    unknown(:, :),
   48    reconsult(:).   49
   50
   51/** <module> Some traditional Edinburgh predicates
   52
   53This module defines  predicates  from   `traditional  Edinburgh  Prolog'
   54(Dec10 and C-Prolog) whose functionality  has   been  replaced  by (ISO)
   55Standard Prolog.
   56*/
   57
   58                 /*******************************
   59                 *            TERM I/O          *
   60                 *******************************/
   61
   62%!  display(+Term) is det.
   63%!  display(+Stream, +Term) is det.
   64%
   65%   Write a term, ignoring operators.
   66%
   67%   @deprecated     New code must use write_term/3 using the option
   68%                   ignore_ops(true).
   69
   70display(Term) :-
   71    write_term(Term, [quoted(true), ignore_ops(true)]).
   72display(Stream, Term) :-
   73    write_term(Stream, Term, [quoted(true), ignore_ops(true)]).
   74
   75%!  unknown(-Old, +New) is det.
   76%
   77%   Edinburgh Prolog predicate for dealing dealing with undefined
   78%   procedures
   79
   80unknown(M:Old, M:New) :-
   81    current_prolog_flag(M:unknown, O),
   82    map_unknown(O, Old),
   83    map_unknown(N, New),
   84    !,
   85    set_prolog_flag(M:unknown, N).
   86
   87map_unknown(error,   trace).
   88map_unknown(warning, trace).
   89map_unknown(fail,    fail).
   90
   91%!  reconsult(+FileOrList) is det.
   92%
   93%   Load source file(s), wiping the  old content first. SWI-Prolog's
   94%   consult/1 and related predicates always do this.
   95%
   96%   @deprecated The Edinburgh Prolog consult/reconsult distinction
   97%   is no longer used throughout most of the Prolog world.
   98
   99reconsult(File) :-
  100    consult(File).
  101
  102%!  debug is det.
  103%!  nodebug is det.
  104%
  105%   Switch on/off debug mode.  Note that nodebug/0 has been defined
  106%   such that is is not traced itself.
  107
  108debug   :- set_prolog_flag(debug, true).
  109nodebug :- notrace, set_prolog_flag(debug, false).
  110
  111:- '$hide'(nodebug/0).  112
  113%!  fileerrors(-Old, +New) is det.
  114%
  115%   Query and change the  fileerrors  flag.   Default  it  is set to
  116%   =true=, causing file operations to   raise an exception. Setting
  117%   it to =false=  activates  the  old   Edinburgh  mode  of  silent
  118%   failure.
  119%
  120%   @deprecated     New code should use catch/3 to handle file errors
  121%                   silently
  122
  123fileerrors(Old, New) :-
  124    current_prolog_flag(fileerrors, Old),
  125    (   Old == New
  126    ->  true
  127    ;   set_prolog_flag(fileerrors, New)
  128    )