Annotation of loncom/xml/run.pm, revision 1.61
1.2 albertel 1: package Apache::run;
1.21 www 2: #
1.61 ! raeburn 3: # $Id: run.pm,v 1.60 2008/11/24 18:55:01 jms Exp $
1.21 www 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: #
1.1 sakharuk 27:
1.26 albertel 28: use HTML::Entities;
29:
1.45 albertel 30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
31: my %_LONCAPA_INTERNAL_oldexpressions=();
32: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
1.24 albertel 33: $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
1.45 albertel 34: $_ =~s/ # $1 will be the variable reference or subroutine name
35: ((?:\$|\&) #look for a starting $ or &
36: (?:[\#|\$]* #support $$ or $#$ etc.
37: [A-Za-z][\w]*| # get variable name
38: \{[A-Za-z][\w]*\})) # for ${a}
39: # $2 is 0 or more array dereferences []
40: # or hash dereferences {}
41: # the ^$ and ^& is because we do this iteratively
42: # $a[$c] becomes $a[3] which then evaluates
43: ([\[\{][^\$\&\]\}]+[\]\}])*?
44: # $3 is the list of arguments
45: (\([^\$\&\)]+\))*?
46: # only match the above if there is not { [ ( coming up
47: # Why? (I.e. this fails &a(1)[2]
48: (?=[^\[\{\(]|$)/
1.47 albertel 49: my ($__LC__a,$__LC__b,$__LC__c)=($1,$2,$3);
50: my $__LC__prefix;
1.49 albertel 51: my $__LC__result;
1.47 albertel 52: while (1) {
1.56 albertel 53: if ($__LC__a =~ m-^&(theta|pi|rho)$-) { last; }
1.47 albertel 54: {
55: use strict;
56: no strict "vars";
57: if (eval(defined(eval($__LC__a.$__LC__b)))) {
1.49 albertel 58: $__LC__result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
1.47 albertel 59: last;
60: }
61: }
62: $__LC__prefix.=substr($__LC__a,0,1,"");
63: if ($__LC__a!~m-^(\$|&|\#)-) { last; }
64: }
1.49 albertel 65: if (!defined($__LC__result)) {
66: $__LC__result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
1.47 albertel 67: }
1.49 albertel 68: $__LC__result;
1.47 albertel 69: /sexg;
1.30 albertel 70: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
1.45 albertel 71: }
1.11 albertel 72: ENDEVALUATE
73:
1.10 albertel 74: sub evaluate {
1.32 albertel 75: my ($expression,$safeeval,$decls) = @_;
76: unless (defined($expression)) { return ''; }
77: if ($Apache::lonxml::evaluate < 1) { return $expression; }
78: my $result = '';
79: $@='';
80: $Apache::run::timeout=0;
1.58 albertel 81: local $main::SIG{'ALRM'} = sub {
1.32 albertel 82: $Apache::run::timeout=1;
1.33 albertel 83: die("timeout");
1.32 albertel 84: };
1.34 albertel 85: my $innererror;
1.32 albertel 86: eval {
1.51 albertel 87: &Apache::lonxml::start_alarm();
1.32 albertel 88: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
89: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
1.34 albertel 90: $innererror=$@;
1.51 albertel 91: &Apache::lonxml::end_alarm();
1.32 albertel 92: };
1.51 albertel 93: my $error=$@;
1.34 albertel 94: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
1.32 albertel 95: $result = $safeeval->reval('return $_;');
96: chomp $result;
97: } else {
98: if ($Apache::run::timeout) {
99: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 100: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 101: }
1.34 albertel 102: &Apache::lonxml::error('substitution on <pre>'.
1.46 albertel 103: &HTML::Entities::encode($expression,'<>&"').
1.34 albertel 104: '</pre> with <pre>'.
1.46 albertel 105: &HTML::Entities::encode($decls,'<>&"').
1.34 albertel 106: '</pre> caused <pre>'.
1.46 albertel 107: &HTML::Entities::encode($error,'<>&"').' '.
108: &HTML::Entities::encode($innererror,'<>&"').
1.34 albertel 109: '</pre>');
1.32 albertel 110: }
111: return $result
1.2 albertel 112: }
113:
114: sub run {
1.32 albertel 115: my ($code,$safeeval,$hideerrors) = @_;
116: my @result;
117: $@='';
118: $Apache::run::timeout=0;
1.58 albertel 119: local $main::SIG{'ALRM'} = sub {
1.32 albertel 120: $Apache::run::timeout=1;
1.33 albertel 121: die("timeout");
1.32 albertel 122: };
1.34 albertel 123: my $innererror;
1.32 albertel 124: eval {
1.51 albertel 125: &Apache::lonxml::start_alarm();
1.32 albertel 126: @result=$safeeval->reval($code);
1.34 albertel 127: $innererror=$@;
1.51 albertel 128: &Apache::lonxml::end_alarm();
1.32 albertel 129: };
130: my $error=$@;
1.34 albertel 131: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
1.32 albertel 132: if ($Apache::run::timeout) {
133: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 134: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 135: }
1.46 albertel 136: my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
137: &HTML::Entities::encode($innererror,'<>&"').
1.59 bisitz 138: '</pre> occurred while running <pre>';
1.46 albertel 139: $code=&HTML::Entities::encode($code,'<>&"');
1.40 albertel 140: if ($innererror=~/line (\d+)/) {
141: my $linenumber=$1;
142: my @code=split("\n",$code);
1.57 albertel 143: if ($linenumber < scalar(@code)) {
144: $code[$linenumber-1]='<b><font color="red">'.
145: $code[$linenumber-1].'</font></b>';
146: }
1.40 albertel 147: $code=join("\n",@code);
148: }
149: &Apache::lonxml::error($errormsg.$code.'</pre>');
1.32 albertel 150: }
151: if ( $#result < '1') {
152: return $result[0];
153: } else {
154: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
155: return (@result);
156: }
1.2 albertel 157: }
158:
1.19 albertel 159: sub dump {
1.42 albertel 160: my ($target,$safeeval)=@_;
161: my $dump='';
162: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
1.54 albertel 163: if (($symname!~ /^(INC|SIG)/) && ($symname!~/\027/) &&
164: ($symname!~/^\_/) && ($symname!~/\:$/)) {
1.42 albertel 165: my $line;
166: if ($safeeval->reval('defined($'.$symname.')')) {
1.50 albertel 167: if ($symname =~ /^\w/) {
168: $line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
169: }
1.42 albertel 170: }
1.61 ! raeburn 171: if ($safeeval->reval('@'.$symname)) {
1.49 albertel 172: $line.='@'.$symname.'=('.
173: $safeeval->reval('join(",",@'.$symname.')').")"."\n";
1.42 albertel 174: }
1.61 ! raeburn 175: if ($safeeval->reval('%'.$symname)) {
1.49 albertel 176: $line.='%'.$symname.'=(';
1.42 albertel 177: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
178: $symname.'{$_} } sort keys %'.
1.53 albertel 179: $symname.')').")"."\n";
180: }
1.49 albertel 181: if ($line ne '') {
182: $line=&HTML::Entities::encode($line,'<>&"');
1.52 albertel 183: $line=~s|\n|<br />|g;
1.49 albertel 184: $dump.=$line;
185: }
1.42 albertel 186: }
1.19 albertel 187: }
1.42 albertel 188: $dump.='';
189: return $dump;
1.19 albertel 190: }
191:
1.2 albertel 192: 1;
193: __END__;
1.60 jms 194:
195: =pod
196:
197: =head1 NAME
198:
199: Apache::run.pm
200:
201: =head1 SYNOPSIS
202:
203: Used to prevent poorly written problems from
204: causing lingering after effects
205:
206: This is part of the LearningOnline Network with CAPA project
207: described at http://www.lon-capa.org.
208:
209:
210: =head1 NOTABLE SUBROUTINES
211:
212: =over
213:
214: =item run(), dump(), evaluate()
215:
216: =back
217:
218: =cut
219:
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