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(:).

   58                 /*******************************
   59                 *            TERM I/O          *
   60                 *******************************/

 display(+Term) is det

 display(+Stream, +Term) is det

Write a term, ignoring operators.

deprecated

- New code must use write_term/3 using the option ignore_ops(true).

   70display(Term) :-
   71    write_term(Term, [quoted(true), ignore_ops(true)]).
   72display(Stream, Term) :-
   73    write_term(Stream, Term, [quoted(true), ignore_ops(true)]).

 unknown(-Old, +New) is det

Edinburgh Prolog predicate for dealing dealing with undefined procedures

   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).

 reconsult(+FileOrList) is det

Load source file(s), wiping the old content first. SWI-Prolog's consult/1 and related predicates always do this.

deprecated

- The Edinburgh Prolog consult/reconsult distinction is no longer used throughout most of the Prolog world.

   99reconsult(File) :-
  100    consult(File).

 debug is det

 nodebug is det

Switch on/off debug mode. Note that nodebug/0 has been defined such that is is not traced itself.

  108debug   :- set_prolog_flag(debug, true).
  109nodebug :- notrace, set_prolog_flag(debug, false).
  110
  111:- '$hide'(nodebug/0).

 fileerrors(-Old, +New) is det

Query and change the fileerrors flag. Default it is set to true, causing file operations to raise an exception. Setting it to false activates the old Edinburgh mode of silent failure.

deprecated

- New code should use catch/3 to handle file errors silently

  123fileerrors(Old, New) :-
  124    current_prolog_flag(fileerrors, Old),
  125    (   Old == New
  126    ->  true
  127    ;   set_prolog_flag(fileerrors, New)
  128    )