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  54(Dec10 and C-Prolog) whose functionality  has   been  replaced  by (ISO)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    ).