/usr/lib/swi-prolog/library/edinburgh.pl is in swi-prolog-nox 5.10.4-3ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 | /* $Id$
Part of SWI-Prolog
Author: Jan Wielemaker
E-mail: J.Wielemaker@uva.nl
WWW: http://www.swi-prolog.org
Copyright (C): 1985-2008, University of Amsterdam
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
As a special exception, if you link this library with other files,
compiled with a Free Software compiler, to produce an executable, this
library does not by itself cause the resulting executable to be covered
by the GNU General Public License. This exception does not however
invalidate any other reasons why the executable file might be covered by
the GNU General Public License.
*/
:- module(edinburgh,
[ display/1,
display/2,
unknown/2,
debug/0,
nodebug/0,
fileerrors/2
]).
/** <module> Some traditional Edinburgh predicates
This module defines predicates from `traditional Edinburgh Prolog'
(Dec10 and C-Prolog) whose functionality has been replaced by (ISO)
Standard Prolog.
*/
/*******************************
* TERM I/O *
*******************************/
%% 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).
display(Term) :-
write_term(Term, [ignore_ops(true)]).
display(Stream, Term) :-
write_term(Stream, Term, [ignore_ops(true)]).
/*******************************
* DEBUGGING *
*******************************/
%% unknown(-Old, +New) is det.
%
% Edinburgh Prolog predicate for dealing dealing with undefined
% procedures
:- meta_predicate unknown(:, :).
unknown(M:Old, M:New) :-
current_prolog_flag(M:unknown, O),
map_unknown(O, Old),
map_unknown(N, New), !,
set_prolog_flag(M:unknown, N).
map_unknown(error, trace).
map_unknown(warning, trace).
map_unknown(fail, fail).
%% 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.
debug :- set_prolog_flag(debug, true).
nodebug :- notrace, set_prolog_flag(debug, false).
:- '$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
fileerrors(Old, New) :-
current_prolog_flag(fileerrors, Old),
( Old == New
-> true
; set_prolog_flag(fileerrors, New)
).
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