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    1: # The LearningOnline Network with CAPA
    2: # Interface routines to MAXIMA CAS
    3: #
    4: # $Id: lonmaxima.pm,v 1.3 2006/06/12 13:51:13 bisitz Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28:  
   29: package Apache::lonmaxima;
   30:  
   31: use strict;
   32: use IO::Socket;
   33: use Apache::lonnet;
   34: 
   35: sub connect {
   36:    return IO::Socket::UNIX->new(Peer    => $Apache::lonnet::perlvar{'lonSockDir'}.'/maximasock',
   37: 				Type    => SOCK_STREAM,
   38: 				Timeout => 10);
   39: }
   40: 
   41: sub disconnect {
   42:     my ($socket)=@_;
   43:     if ($socket) { close($socket); }
   44: }
   45: 
   46: sub maximareply {
   47:     my ($socket,$cmd)=@_;
   48:     if ($socket) {
   49: 	print $socket &Apache::lonnet::escape($cmd)."\n";
   50:         my $reply=<$socket>;
   51:         chomp($reply);
   52:         if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; }
   53:         return &Apache::lonnet::unescape($reply);
   54:     } else {
   55:         return 'Error: no connection.';
   56:     }
   57: }
   58: 
   59: sub blacklisted {
   60:     my ($cmd)=@_;
   61:     foreach my $forbidden ('save','load','plot','lisp','includ','compil','file','batch','stringout','translat','stout','stin','block','system') {
   62: 	if ($cmd=~/$forbidden/s) { return 1; }
   63:     } 
   64:     return 0;
   65: }
   66: 
   67: sub compareterms {
   68:     my ($socket,$terma,$termb)=@_;
   69:     my $difference=$terma.'-'.$termb;
   70:     if (&blacklisted($difference)) { return 'Error: blacklisted'; }
   71:     my $reply=&maximareply($socket,'trigsimp(trigreduce('.$difference.'));');
   72:     if ($reply=~/^\s*0\s*$/) { return 'true'; }
   73:     if ($reply=~/^Error\:/) { return $reply; }
   74:     return 'false';
   75: }
   76: 
   77: sub maxima_check {
   78:     my ($response,$answer,$type,
   79:         $tol_type,$tol,
   80:         $sig_lbound,$sig_ubound,
   81:         $ans_fmt,$unit,$calc,$id_list,
   82:         $points,
   83:         $randomseed,
   84:         $reterror) = @_;
   85:     return 7;
   86: }
   87:  
   88: 1;
   89: __END__;