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/* 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)).
/** <module> 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] ].
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