This file is part of Logtalk https://logtalk.org/ SPDX-FileCopyrightText: 2003 Gregory J. Duck SPDX-FileCopyrightText: 2019 Paulo Moura <pmoura@logtalk.org> SPDX-License-Identifier: GPL-2.0-or-later

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 General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

`toychr`

This folder contains a Logtalk port of ToyCHR, a reference implementation of Constraint Handling Rules (CHR) available from:

https://www.comp.nus.edu.sg/~gregory/toychr/

The port is work in progress and includes significant modifications to the original code:

Instead of compiling `.chr` files, it uses the term-expansion mechanism, by defining toychrdb as a hook object, to support writing rules inside objects and categories. As a consequence, the original chr_compile/1 is not available.
The port is portable and should run on all supported backends. The port also includes examples ported from the SWI-Prolog CHR package examples and documentation. These examples are ported using the same license of the original code (BSD-2-Clause).
For sample queries, please see the SCRIPT.txt file.

API documentation

Open the [../../docs/library_index.html#toychr](../../docs/library_index.html#toychr) link in a web browser.

Loading

To load all entities in this port, load the loader.lgt file:

| ?- logtalk_load(toychr(loader)).

Testing

To test this port predicates, load the tester.lgt file:

| ?- logtalk_load(toychr(tester)).