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/* Part of XPCE --- The SWI-Prolog GUI toolkit
Author: Jan Wielemaker and Anjo Anjewierden
E-mail: jan@swi.psy.uva.nl
WWW: http://www.swi.psy.uva.nl/projects/xpce/
Copyright (c) 1985-2002, University of 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(pce_renew, [pce_renew/1]).
:- use_module(library(pce)).
:- require([ between/3
, memberchk/2
]).
:- dynamic renew_mode/1.
pce_renew(Mode) :-
memberchk(Mode, [trace, free, rename, ask]),
!,
retractall(renew_mode(_)),
assert(renew_mode(Mode)).
pce_renew(_Mode) :-
send(@pce, report, error,
'pce_renew/1: mode is {trace,free,rename,ask}'),
fail.
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
This library traps the redefined_assoc exception generated on an attempt
to create an object with an already existing reference. A prompter is
displayed that allows the user to free the old object, rename it or
generate the normal error (thus allowing the programmer to inspect the
context of the redefinition).
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
:- send(@pce?exception_handlers, value, redefined_assoc,
message(@prolog, call, confirm, @arg1)).
confirm(_Ref) :- % trace
renew_mode(trace),
!,
fail.
confirm(Ref) :- % free
renew_mode(free),
!,
send(@Ref, free).
confirm(Ref) :- % rename
renew_mode(rename),
!,
Object = @Ref,
between(1, 100000, X),
atom_concat(Ref, X, NewName),
\+ object(@NewName),
!,
send(Object, name_reference, NewName).
confirm(Ref) :- % ask
Object = @Ref,
between(1, 100000, X),
atom_concat(Ref, X, NewName),
\+ object(@NewName),
!,
new(D, dialog),
send(D, kind, transient),
send(D, append,
label(message,
string('PCE: new: object %s/%s already exists.',
Ref, Object?'_class_name'))),
send(D, append,
button('Free old object',
and(message(Object, '_free'),
message(D, return, free)))),
send(D, append,
button(string('Rename into @%s', NewName),
and(message(Object, name_reference, NewName),
message(D, return, rename)))),
send(D, append,
button(error,
message(D, return, error))),
get(D, confirm_centered, Answer),
send(D, destroy),
Answer \== error.
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