1: package Apache::run;
2: #
3: # $Id: run.pm,v 1.33 2003/03/25 03:00:31 albertel Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27:
28: use HTML::Entities;
29:
30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
31: my %_LONCAPA_INTERNAL_oldexpressions=();
32: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
33: $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
34: $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
35: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
36: }
37: ENDEVALUATE
38:
39: sub evaluate {
40: my ($expression,$safeeval,$decls) = @_;
41: unless (defined($expression)) { return ''; }
42: if ($Apache::lonxml::evaluate < 1) { return $expression; }
43: my $result = '';
44: $@='';
45: $Apache::run::timeout=0;
46: $main::SIG{'ALRM'} = sub {
47: $Apache::run::timeout=1;
48: die("timeout");
49: };
50: eval {
51: alarm(Apache->request->server->timeout);
52: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
53: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
54: alarm(0);
55: };
56: my $error=$@;
57: if ($error eq '' && !$Apache::run::timeout) {
58: $result = $safeeval->reval('return $_;');
59: chomp $result;
60: } else {
61: if ($Apache::run::timeout) {
62: $error = 'Code ran too long. It ran for more than '.
63: Apache->request->server->timeout.' seconds';
64: }
65: &Apache::lonxml::error('substitution on <pre>'.$expression.
66: '</pre> with <pre>'.$decls.
67: '</pre> caused <pre>'.$error);
68: }
69: return $result
70: }
71:
72: sub run {
73: my ($code,$safeeval,$hideerrors) = @_;
74: my @result;
75: $@='';
76: $Apache::run::timeout=0;
77: $main::SIG{'ALRM'} = sub {
78: $Apache::run::timeout=1;
79: die("timeout");
80: };
81: eval {
82: alarm(Apache->request->server->timeout);
83: @result=$safeeval->reval($code);
84: alarm(0);
85: };
86: my $error=$@;
87: if (($Apache::run::timeout || $error ne '') && !$hideerrors) {
88: if ($Apache::run::timeout) {
89: $error = 'Code ran too long. It ran for more than '.
90: Apache->request->server->timeout.' seconds';
91: }
92: &Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
93: '</pre> occured while running <pre>'.
94: &HTML::Entities::encode($code).'</pre>');
95: }
96: if ( $#result < '1') {
97: return $result[0];
98: } else {
99: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
100: return (@result);
101: }
102: }
103:
104: sub dump {
105: my ($target,$safeeval)=@_;
106: my $dump='';
107: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
108: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
109: my $line;
110: if ($safeeval->reval('defined($'.$symname.')')) {
111: $line='$'.$symname.'='.$safeeval->reval('$'.$symname);
112: }
113: if ($safeeval->reval('defined(@'.$symname.')')) {
114: $line='@'.$symname.'=('.
115: $safeeval->reval('join(",",@'.$symname.')').")";
116: }
117: if ($safeeval->reval('defined(%'.$symname.')')) {
118: $line='%'.$symname.'=(';
119: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
120: $symname.'{$_} } sort keys %'.
121: $symname.')').")"
122: }
123: if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
124: }
125: }
126: $dump.='';
127: return $dump;
128: }
129:
130: 1;
131: __END__;
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