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) 2019, VU University Amsterdam 7 All rights reserved. 8 9 Redistribution and use in source and binary forms, with or without 10 modification, are permitted provided that the following conditions 11 are met: 12 13 1. Redistributions of source code must retain the above copyright 14 notice, this list of conditions and the following disclaimer. 15 16 2. Redistributions in binary form must reproduce the above copyright 17 notice, this list of conditions and the following disclaimer in 18 the documentation and/or other materials provided with the 19 distribution. 20 21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 31 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 POSSIBILITY OF SUCH DAMAGE. 33*/ 34 35:- module(standard, 36 [ error_write/1, % @Message 37 error_writeln/1, % @Message 38 console_write/1, % @Message 39 console_writeln/1, % @Message 40 warning/1, % @Message 41 message/1, % @Message 42 messageln/1 % @Message 43 ]).
55:- create_prolog_flag(warning_action, print_warning, [keep(true)]).
user_error
.62error_write(Term) :- 63 write(user_error, Term). 64error_writeln(Term) :- 65 writeln(user_error, Term).
user_error
. The XSB version writes to
STDFDBK
. What does that mean?73console_write(Term) :- 74 write(user_error, Term). 75console_writeln(Term) :- 76 writeln(user_error, Term).
warning_action
,
which can be one of:
error(xsb_warning(Message), _)
If Message is a list or comma-list, the elements are concatenated without a space.
93warning(Message) :- 94 current_prolog_flag(warning_action, Action), 95 warning(Action, Message). 96 97warning(silent_warning, _) :- 98 !. 99warning(error_warning, Term) :- 100 !, 101 throw(error(xsb_warning(Term), _)). 102warning(_, Term) :- 103 print_message(warning, xsb_warning(Term)). 104 105:- multifile 106 prolog:message//1. 107 108prologmessage(xsb_warning(Term)) --> 109 [ 'XSB:'-[] ], 110 xsb_warning(Term). 111prologerror_message(xsb_warning(Term)) --> 112 [ 'XSB:'-[] ], 113 xsb_warning(Term). 114 115xsb_warning(List) --> 116 { is_list(List) }, 117 !, 118 xsb_warning_list(List). 119xsb_warning(Var) --> 120 { var(Var) }, 121 !, 122 [ '~w'-[Var] ]. 123xsb_warning((A,B)) --> 124 !, 125 xsb_warning(A), 126 xsb_warning(B). 127xsb_warning(Term) --> 128 [ '~w'-[Term] ]. 129 130xsb_warning_list([]) --> 131 []. 132xsb_warning_list([H|T]) --> 133 [ '~w'-[H] ], 134 xsb_warning_list(T).
user_error
. As warning/1, Message can be a list
or comma list.
145message(Message) :- 146 is_list(Message), 147 !, 148 maplist(message_elem, Message). 149message(Var) :- 150 var(Var), 151 !, 152 message_elem(Var). 153message((A,B)) :- 154 !, 155 message(A), 156 message(B). 157message(Term) :- 158 message_elem(Term). 159 160messageln(Term) :- 161 message(Term), 162 nl(user_error). 163 164message_elem(Term) :- 165 write(user_error, Term)
XSB Term Writing to Designated I/O Streams
This module emulates the XSB dedicated term writing predicates from the
standard
module.user_error
. Onlt warning/1 is redirected through SWI-Prolog's print_message/2 interface. */