Annotation of loncom/homework/lonmaxima.pm, revision 1.24

1.1       www         1: # The LearningOnline Network with CAPA
                      2: # Interface routines to MAXIMA CAS
                      3: #
1.24    ! bisitz      4: # $Id: lonmaxima.pm,v 1.23 2008/06/14 16:34:54 www Exp $
1.1       www         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;
1.9       www        34: use Apache::response();
1.4       bisitz     35: use LONCAPA;
1.1       www        36: 
                     37: sub connect {
                     38:    return IO::Socket::UNIX->new(Peer    => $Apache::lonnet::perlvar{'lonSockDir'}.'/maximasock',
                     39: 				Type    => SOCK_STREAM,
                     40: 				Timeout => 10);
                     41: }
                     42: 
                     43: sub disconnect {
                     44:     my ($socket)=@_;
                     45:     if ($socket) { close($socket); }
                     46: }
                     47: 
                     48: sub maximareply {
                     49:     my ($socket,$cmd)=@_;
                     50:     if ($socket) {
1.4       bisitz     51: 	print $socket &escape($cmd)."\n";
1.1       www        52:         my $reply=<$socket>;
                     53:         chomp($reply);
                     54:         if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; }
1.4       bisitz     55:         return &unescape($reply);
1.1       www        56:     } else {
                     57:         return 'Error: no connection.';
                     58:     }
                     59: }
                     60: 
                     61: sub blacklisted {
                     62:     my ($cmd)=@_;
1.19      albertel   63:     foreach my $forbidden ('save','load','plot','lisp','includ','compil',
1.15      albertel   64: 			   'file','batch','stringout','translat','stout',
1.20      riegler    65: 			   'stin','block','system','concat','read','inchar',
1.21      riegler    66: 			   'outchar','ttyoff','with_stdout','writefile',
1.24    ! bisitz     67: 			   'reset','quit','\? ','\?','display2d','%i','%o','describe') {
1.2       www        68: 	if ($cmd=~/$forbidden/s) { return 1; }
1.1       www        69:     } 
                     70:     return 0;
                     71: }
                     72: 
1.23      www        73: sub maxima_allowed_libraries {
                     74:    return (
                     75:       "absimp","affine","atensor","atrig1","augmented_lagrangian","contrib_ode","ctensor","descriptive","diag",
                     76:       "eigen","facexp","fft","fourie","functs","ggf","grobner","impdiff","ineq","interpol","itensor","lapack",
                     77:       "lbfgs","lindstedt","linearalgebra","lsquares","makeOrders","mnewton","mchrpl","ntrig","orthopoly",
                     78:       "quadpack","rducon","romberg","scifac","simplex","solve_rec","sqdnst","stats","sterling","sym","units",
                     79:       "vect","zeilberger");
                     80: }
                     81: 
                     82: sub maxima_is_allowed_library {
                     83:     my ($library)=@_;
                     84:     foreach my $allowed_library (&maxima_allowed_libraries()) {
                     85:        if ($library eq $allowed_library) { return 1; }
                     86:     }
                     87:     return 0;
                     88: }
                     89: 
1.6       www        90: sub runscript {
1.23      www        91:     my ($socket,$fullscript,$libraries)=@_;
1.6       www        92:     if (&blacklisted($fullscript)) { return 'Error: blacklisted'; }
1.7       www        93:     my $reply;
                     94:     $fullscript=~s/[\n\r\l]//gs;
1.23      www        95:     if ($libraries) {
                     96:        foreach my $library (split(/\s*\,\s*/,$libraries)) {
                     97:           unless ($library=~/\w/) { next; }
                     98:           if (&maxima_is_allowed_library($library)) {
                     99:               $reply=&maximareply($socket,'load('.$library.')$'."\n");
                    100:               if ($reply=~/^Error\:/) { return $reply; }
                    101:           } else { 
                    102:              return 'Error: blacklisted'; 
                    103:           }
                    104:        }
                    105:     }
1.7       www       106:     foreach my $line (split(/\;/s,$fullscript)) {
                    107: 	if ($line=~/\w/) { $reply=&maximareply($socket,$line.";\n"); }
                    108: 	if ($reply=~/^Error\:/) { return $reply; }
                    109:     }
1.14      www       110:     $reply=~s/^\s*//gs;
                    111:     $reply=~s/\s*$//gs;
1.15      albertel  112:     &Apache::lonxml::debug("maxima $fullscript \n reply $reply");
1.7       www       113:     return $reply;
1.6       www       114: }
                    115: 
1.9       www       116: sub maxima_cas_formula_fix {
                    117:    my ($expression)=@_;
                    118:    return &Apache::response::implicit_multiplication($expression);
                    119: }
                    120: 
1.6       www       121: sub maxima_run {
1.23      www       122:     my ($script,$submission,$argument,$libraries) = @_;
1.6       www       123:     my $socket=&connect();
1.12      www       124:     my @submissionarray=split(/\s*\,\s*/,$submission);
                    125:     for (my $i=0;$i<=$#submissionarray;$i++) {
                    126:         my $n=$i+1;
                    127:         my $fixedsubmission=&maxima_cas_formula_fix($submissionarray[$i]);
                    128:         $script=~s/RESPONSE\[$n\]/$fixedsubmission/gs;
1.7       www       129:     }
1.12      www       130:     my @argumentarray=@{$argument};
                    131:     for (my $i=0;$i<=$#argumentarray;$i++) {
                    132:         my $n=$i+1;
                    133:         my $fixedargument=&maxima_cas_formula_fix($argumentarray[$i]);
                    134:         $script=~s/LONCAPALIST\[$n\]/$fixedargument/gs;
1.7       www       135:     }
1.23      www       136:     my $reply=&runscript($socket,$script,$libraries);
1.6       www       137:     &disconnect($socket);
1.13      raeburn   138:     if ($reply=~/^\s*true\s*$/i) { return 'EXACT_ANS'; }
                    139:     if ($reply=~/^\s*false\s*$/i) { return 'INCORRECT'; } 
1.6       www       140:     return 'BAD_FORMULA';
                    141: }
                    142: 
1.11      www       143: sub maxima_eval {
1.23      www       144:     my ($script,$libraries) = @_;
1.11      www       145:     my $socket=&connect();
1.23      www       146:     my $reply=&runscript($socket,$script,$libraries);
1.11      www       147:     &disconnect($socket);
                    148:     return $reply;
                    149: }
                    150: 
                    151: 
1.1       www       152: sub compareterms {
                    153:     my ($socket,$terma,$termb)=@_;
1.16      albertel  154:     my $difference=$terma.'-('.$termb.')';
1.1       www       155:     if (&blacklisted($difference)) { return 'Error: blacklisted'; }
                    156:     my $reply=&maximareply($socket,'trigsimp(trigreduce('.$difference.'));');
                    157:     if ($reply=~/^\s*0\s*$/) { return 'true'; }
                    158:     if ($reply=~/^Error\:/) { return $reply; }
                    159:     return 'false';
                    160: }
1.3       bisitz    161: 
                    162: sub maxima_check {
1.5       albertel  163:     my ($response,$answer,$reterror) = @_;
1.4       bisitz    164:     my $socket=&connect();
                    165:     my $reply=&compareterms($socket,$response,$answer);
                    166:     &disconnect($socket);
1.17      albertel  167:     # integer to string mappings come from capaParser.h
                    168:     # 1 maps to 'EXACT_ANS'
1.4       bisitz    169:     if ($reply eq 'true') { return 1; }
1.22      www       170:     # 11 maps to 'BAD_FORMULA'
                    171:     if ($reply=~/^Error\:/) { return 11; }
1.17      albertel  172:     # 7 maps to 'INCORRECT'
1.3       bisitz    173:     return 7;
                    174: }
1.1       www       175:  
                    176: 1;
                    177: __END__;

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