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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