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Annotation of loncom/homework/lonmaxima.pm, revision 1.1

1.1     ! www         1: # The LearningOnline Network with CAPA
        !             2: # Interface routines to MAXIMA CAS
        !             3: #
        !             4: # $Id: loncommon.pm,v 1.305 2006/03/04 21:32:30 www 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=~/$forbidden/) { return 1; }
        !            63:     } 
        !            64:     return 0;
        !            65: }
        !            66: 
        !            67: sub compareterms {
        !            68:     my ($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: 1;
        !            78: __END__;