/* Part of SWI-Prolog Author: Jan Wielemaker E-mail: J.Wielemaker@vu.nl WWW: http://www.swi-prolog.org Copyright (c) 2019, VU University Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(error_handler, [ check_acyclic/3, % ?Term,+Predicate,+Arg check_atom/3, % ?Term,+Predicate,+Arg check_callable/3, % ?Term,+Predicate,+Arg check_integer/3, % ?Term,+Predicate,+Arg check_nonvar/3, % ?Term,+Predicate,+Arg check_nonvar_list/3, % ?Term,+Predicate,+Arg % check_one_thread/3, % +Operation,+Object_Type,+Predicate check_stream/3, % ?Term,+Predicate,+Arg check_var/3, % ?Term,+Predicate,+Arg check_ground/3, % ?Term,+Predicate,+Arg domain_error/4, % +Valid_type,-Culprit,+Predicate,+Arg print_backtrace/1, % +Backtrace xsb_error_get_tag/2, % +ErrorTerm, -Formal xsb_error_get_message/2 % +ErrorTerm, -Message ]). :- use_module(library(error)). :- use_module(library(prolog_stack)). /** XSB compatible error handling */ check_acyclic(Term, _Pred, _Arg) :- must_be(acyclic, Term). check_atom(Term, _Pred, _Arg) :- must_be(atom, Term). check_callable(Term, _Pred, _Arg) :- must_be(callable, Term). check_integer(Term, _Pred, _Arg) :- must_be(integer, Term). check_nonvar(Term, _Pred, _Arg) :- must_be(nonvar, Term). check_nonvar_list(Term, _Pred, _Arg) :- must_be(list(nonvar), Term). check_stream(Term, _Pred, _Arg) :- must_be(stream, Term). check_var(Term, _Pred, _Arg) :- must_be(var, Term). check_ground(Term, _Pred, _Arg) :- must_be(ground, Term). %! xsb_error_get_tag(+Term, -Tag) is semidet. % % Tag is the formal part of an error(Formal,Context) term. xsb_error_get_tag(error(Tag, _), Tag). %! xsb_error_get_message(+Term, -Message) is semidet. % % Message is the additional explanation context for an error term, xsb_error_get_message(error(_, Context), Message) :- error_context_message(Context, Message). error_context_message(Var, Var) :- var(Var), !. error_context_message(context(Message, _Stack), Message). %! domain_error(+Valid_type, -Culprit, +Predicate, +Arg) % % Throws a domain error. domain_error(Type, Culprit, _Pred, _Arg) :- domain_error(Type, Culprit). %! print_backtrace(+Backtrace) % % This predicate, which is used by XSB’s default error handler, prints % a backtrace structure to XSB’s standard error stream. print_backtrace(Backtrace) :- print_prolog_backtrace(user_error, Backtrace). /******************************* * MESSAGES * *******************************/ :- multifile prolog:message//1. prolog:message(aborted(Text)) --> [ '(abort) ~w'-[Text] ].