# The LearningOnline Network with CAPA # Interface routines to MAXIMA CAS # # $Id: lonmaxima.pm,v 1.4 2006/06/12 14:22:01 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; use LONCAPA; 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 $socket &escape($cmd)."\n"; my $reply=<$socket>; chomp($reply); if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; } return &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) = @_; my $socket=&connect(); my $reply=&compareterms($socket,$response,$answer); &disconnect($socket); if ($reply eq 'true') { return 1; } return 7; } 1; __END__;