Annotation of loncom/xml/run.pm, revision 1.44
1.2 albertel 1: package Apache::run;
1.21 www 2: #
1.44 ! albertel 3: # $Id: run.pm,v 1.43 2004/01/29 18:46:25 albertel 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:
1.11 albertel 30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
1.24 albertel 31: my %_LONCAPA_INTERNAL_oldexpressions=();
32: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
33: $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
1.44 ! albertel 34: $_ =~s/((?:\$|\&)(?:(?:\#\$|\#)?[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
1.30 albertel 35: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
1.11 albertel 36: }
37: ENDEVALUATE
38:
1.10 albertel 39: sub evaluate {
1.32 albertel 40: my ($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;
1.33 albertel 48: die("timeout");
1.32 albertel 49: };
1.34 albertel 50: my $innererror;
1.32 albertel 51: eval {
1.35 albertel 52: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
1.32 albertel 53: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
54: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
1.34 albertel 55: $innererror=$@;
1.32 albertel 56: alarm(0);
57: };
58: my $error=$@;
1.34 albertel 59: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
1.32 albertel 60: $result = $safeeval->reval('return $_;');
61: chomp $result;
62: } else {
63: if ($Apache::run::timeout) {
64: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 65: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 66: }
1.34 albertel 67: &Apache::lonxml::error('substitution on <pre>'.
68: &HTML::Entities::encode($expression).
69: '</pre> with <pre>'.
70: &HTML::Entities::encode($decls).
71: '</pre> caused <pre>'.
72: &HTML::Entities::encode($error).' '.
73: &HTML::Entities::encode($innererror).
74: '</pre>');
1.32 albertel 75: }
76: return $result
1.2 albertel 77: }
78:
79: sub run {
1.32 albertel 80: my ($code,$safeeval,$hideerrors) = @_;
81: my @result;
82: $@='';
83: $Apache::run::timeout=0;
84: $main::SIG{'ALRM'} = sub {
85: $Apache::run::timeout=1;
1.33 albertel 86: die("timeout");
1.32 albertel 87: };
1.34 albertel 88: my $innererror;
1.32 albertel 89: eval {
1.35 albertel 90: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
1.32 albertel 91: @result=$safeeval->reval($code);
1.34 albertel 92: $innererror=$@;
1.32 albertel 93: alarm(0);
94: };
95: my $error=$@;
1.34 albertel 96: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
1.32 albertel 97: if ($Apache::run::timeout) {
98: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 99: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 100: }
1.40 albertel 101: my $errormsg='<pre>'.&HTML::Entities::encode($error).' '.
102: &HTML::Entities::encode($innererror).
103: '</pre> occured while running <pre>';
104: $code=&HTML::Entities::encode($code);
105: if ($innererror=~/line (\d+)/) {
106: my $linenumber=$1;
107: my @code=split("\n",$code);
108: $code[$linenumber-1]='<b><font color="red">'.
109: $code[$linenumber-1].'</font></b>';
110: $code=join("\n",@code);
111: }
112: &Apache::lonxml::error($errormsg.$code.'</pre>');
1.32 albertel 113: }
114: if ( $#result < '1') {
115: return $result[0];
116: } else {
117: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
118: return (@result);
119: }
1.2 albertel 120: }
121:
1.19 albertel 122: sub dump {
1.42 albertel 123: my ($target,$safeeval)=@_;
124: my $dump='';
125: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
126: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
127: my $line;
128: if ($safeeval->reval('defined($'.$symname.')')) {
129: $line='$'.$symname.'='.$safeeval->reval('$'.$symname);
130: }
131: if ($safeeval->reval('defined(@'.$symname.')')) {
132: $line='@'.$symname.'=('.
133: $safeeval->reval('join(",",@'.$symname.')').")";
134: }
135: if ($safeeval->reval('defined(%'.$symname.')')) {
136: $line='%'.$symname.'=(';
137: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
138: $symname.'{$_} } sort keys %'.
139: $symname.')').")"
140: }
141: if ($line ne '') {$dump.=&HTML::Entities::encode($line)."<br />";}
142: }
1.19 albertel 143: }
1.42 albertel 144: $dump.='';
145: return $dump;
1.19 albertel 146: }
147:
1.2 albertel 148: 1;
149: __END__;
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