File:
[LON-CAPA] /
loncom /
homework /
lonmaxima.pm
Revision
1.21:
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Tue Aug 14 21:54:54 2007 UTC (17 years, 1 month ago) by
riegler
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CVS tags:
version_2_6_X,
version_2_6_3,
version_2_6_2,
version_2_6_1,
version_2_6_0,
version_2_5_X,
version_2_5_99_1,
version_2_5_99_0,
version_2_5_2,
version_2_5_1,
version_2_5_0,
HEAD
put reset on blacklist
1: # The LearningOnline Network with CAPA
2: # Interface routines to MAXIMA CAS
3: #
4: # $Id: lonmaxima.pm,v 1.21 2007/08/14 21:54:54 riegler 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: use Apache::response();
35: use LONCAPA;
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) {
51: print $socket &escape($cmd)."\n";
52: my $reply=<$socket>;
53: chomp($reply);
54: if ($reply=~/^Incorrect/) { $reply='Error: '.$reply; }
55: return &unescape($reply);
56: } else {
57: return 'Error: no connection.';
58: }
59: }
60:
61: sub blacklisted {
62: my ($cmd)=@_;
63: foreach my $forbidden ('save','load','plot','lisp','includ','compil',
64: 'file','batch','stringout','translat','stout',
65: 'stin','block','system','concat','read','inchar',
66: 'outchar','ttyoff','with_stdout','writefile',
67: 'reset') {
68: if ($cmd=~/$forbidden/s) { return 1; }
69: }
70: return 0;
71: }
72:
73: sub runscript {
74: my ($socket,$fullscript)=@_;
75: if (&blacklisted($fullscript)) { return 'Error: blacklisted'; }
76: my $reply;
77: $fullscript=~s/[\n\r\l]//gs;
78: foreach my $line (split(/\;/s,$fullscript)) {
79: if ($line=~/\w/) { $reply=&maximareply($socket,$line.";\n"); }
80: if ($reply=~/^Error\:/) { return $reply; }
81: }
82: $reply=~s/^\s*//gs;
83: $reply=~s/\s*$//gs;
84: &Apache::lonxml::debug("maxima $fullscript \n reply $reply");
85: return $reply;
86: }
87:
88: sub maxima_cas_formula_fix {
89: my ($expression)=@_;
90: return &Apache::response::implicit_multiplication($expression);
91: }
92:
93: sub maxima_run {
94: my ($script,$submission,$argument) = @_;
95: my $socket=&connect();
96: my @submissionarray=split(/\s*\,\s*/,$submission);
97: for (my $i=0;$i<=$#submissionarray;$i++) {
98: my $n=$i+1;
99: my $fixedsubmission=&maxima_cas_formula_fix($submissionarray[$i]);
100: $script=~s/RESPONSE\[$n\]/$fixedsubmission/gs;
101: }
102: my @argumentarray=@{$argument};
103: for (my $i=0;$i<=$#argumentarray;$i++) {
104: my $n=$i+1;
105: my $fixedargument=&maxima_cas_formula_fix($argumentarray[$i]);
106: $script=~s/LONCAPALIST\[$n\]/$fixedargument/gs;
107: }
108: my $reply=&runscript($socket,$script);
109: &disconnect($socket);
110: if ($reply=~/^\s*true\s*$/i) { return 'EXACT_ANS'; }
111: if ($reply=~/^\s*false\s*$/i) { return 'INCORRECT'; }
112: return 'BAD_FORMULA';
113: }
114:
115: sub maxima_eval {
116: my ($script) = @_;
117: my $socket=&connect();
118: my $reply=&runscript($socket,$script);
119: &disconnect($socket);
120: return $reply;
121: }
122:
123:
124: sub compareterms {
125: my ($socket,$terma,$termb)=@_;
126: my $difference=$terma.'-('.$termb.')';
127: if (&blacklisted($difference)) { return 'Error: blacklisted'; }
128: my $reply=&maximareply($socket,'trigsimp(trigreduce('.$difference.'));');
129: if ($reply=~/^\s*0\s*$/) { return 'true'; }
130: if ($reply=~/^Error\:/) { return $reply; }
131: return 'false';
132: }
133:
134: sub maxima_check {
135: my ($response,$answer,$reterror) = @_;
136: my $socket=&connect();
137: my $reply=&compareterms($socket,$response,$answer);
138: &disconnect($socket);
139: # integer to string mappings come from capaParser.h
140: # 1 maps to 'EXACT_ANS'
141: if ($reply eq 'true') { return 1; }
142: # 7 maps to 'INCORRECT'
143: return 7;
144: }
145:
146: 1;
147: __END__;
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