# The LearningOnline Network with CAPA
# Interface routines to MAXIMA CAS
#
# $Id: lonmaxima.pm,v 1.3 2006/06/12 13:51:13 bisitz Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA 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.
#
# LON-CAPA 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 LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
package Apache::lonmaxima;
use strict;
use IO::Socket;
use Apache::lonnet;
sub connect {
return IO::Socket::UNIX->new(Peer => $Apache::lonnet::perlvar{'lonSockDir'}.'/maximasock',
Type => SOCK_STREAM,
Timeout => 10);
}
sub disconnect {
my ($socket)=@_;
if ($socket) { close($socket); }
}
sub maximareply {
my ($socket,$cmd)=@_;
if ($socket) {
print $socket &Apache::lonnet::escape($cmd)."\n";
my $reply=<$socket>;
chomp($reply);
if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; }
return &Apache::lonnet::unescape($reply);
} else {
return 'Error: no connection.';
}
}
sub blacklisted {
my ($cmd)=@_;
foreach my $forbidden ('save','load','plot','lisp','includ','compil','file','batch','stringout','translat','stout','stin','block','system') {
if ($cmd=~/$forbidden/s) { return 1; }
}
return 0;
}
sub compareterms {
my ($socket,$terma,$termb)=@_;
my $difference=$terma.'-'.$termb;
if (&blacklisted($difference)) { return 'Error: blacklisted'; }
my $reply=&maximareply($socket,'trigsimp(trigreduce('.$difference.'));');
if ($reply=~/^\s*0\s*$/) { return 'true'; }
if ($reply=~/^Error\:/) { return $reply; }
return 'false';
}
sub maxima_check {
my ($response,$answer,$type,
$tol_type,$tol,
$sig_lbound,$sig_ubound,
$ans_fmt,$unit,$calc,$id_list,
$points,
$randomseed,
$reterror) = @_;
return 7;
}
1;
__END__;
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