Annotation of loncom/xml/run.pm, revision 1.47
1.2 albertel 1: package Apache::run;
1.21 www 2: #
1.47 ! albertel 3: # $Id: run.pm,v 1.46 2004/03/31 05:24:00 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:
1.45 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;
! 51: my $result;
! 52: while (1) {
! 53: {
! 54: use strict;
! 55: no strict "vars";
! 56: if (eval(defined(eval($__LC__a.$__LC__b)))) {
! 57: $result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
! 58: last;
! 59: }
! 60: }
! 61: $__LC__prefix.=substr($__LC__a,0,1,"");
! 62: if ($__LC__a!~m-^(\$|&|\#)-) { last; }
! 63: }
! 64: if (!defined($result)) {
! 65: $result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
! 66: }
! 67: $result;
! 68: /sexg;
1.30 albertel 69: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
1.45 albertel 70: }
1.11 albertel 71: ENDEVALUATE
72:
1.10 albertel 73: sub evaluate {
1.32 albertel 74: my ($expression,$safeeval,$decls) = @_;
75: unless (defined($expression)) { return ''; }
76: if ($Apache::lonxml::evaluate < 1) { return $expression; }
77: my $result = '';
78: $@='';
79: $Apache::run::timeout=0;
80: $main::SIG{'ALRM'} = sub {
81: $Apache::run::timeout=1;
1.33 albertel 82: die("timeout");
1.32 albertel 83: };
1.34 albertel 84: my $innererror;
1.47 ! albertel 85: $safeeval->permit("require");
1.32 albertel 86: eval {
1.35 albertel 87: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
1.32 albertel 88: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
89: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
1.34 albertel 90: $innererror=$@;
1.32 albertel 91: alarm(0);
92: };
1.47 ! albertel 93: $safeeval->deny("require");
1.32 albertel 94: my $error=$@;
1.34 albertel 95: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
1.32 albertel 96: $result = $safeeval->reval('return $_;');
97: chomp $result;
98: } else {
99: if ($Apache::run::timeout) {
100: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 101: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 102: }
1.34 albertel 103: &Apache::lonxml::error('substitution on <pre>'.
1.46 albertel 104: &HTML::Entities::encode($expression,'<>&"').
1.34 albertel 105: '</pre> with <pre>'.
1.46 albertel 106: &HTML::Entities::encode($decls,'<>&"').
1.34 albertel 107: '</pre> caused <pre>'.
1.46 albertel 108: &HTML::Entities::encode($error,'<>&"').' '.
109: &HTML::Entities::encode($innererror,'<>&"').
1.34 albertel 110: '</pre>');
1.32 albertel 111: }
112: return $result
1.2 albertel 113: }
114:
115: sub run {
1.32 albertel 116: my ($code,$safeeval,$hideerrors) = @_;
117: my @result;
118: $@='';
119: $Apache::run::timeout=0;
120: $main::SIG{'ALRM'} = sub {
121: $Apache::run::timeout=1;
1.33 albertel 122: die("timeout");
1.32 albertel 123: };
1.34 albertel 124: my $innererror;
1.32 albertel 125: eval {
1.35 albertel 126: alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
1.32 albertel 127: @result=$safeeval->reval($code);
1.34 albertel 128: $innererror=$@;
1.32 albertel 129: alarm(0);
130: };
131: my $error=$@;
1.34 albertel 132: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
1.32 albertel 133: if ($Apache::run::timeout) {
134: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 135: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 136: }
1.46 albertel 137: my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
138: &HTML::Entities::encode($innererror,'<>&"').
1.40 albertel 139: '</pre> occured while running <pre>';
1.46 albertel 140: $code=&HTML::Entities::encode($code,'<>&"');
1.40 albertel 141: if ($innererror=~/line (\d+)/) {
142: my $linenumber=$1;
143: my @code=split("\n",$code);
144: $code[$linenumber-1]='<b><font color="red">'.
145: $code[$linenumber-1].'</font></b>';
146: $code=join("\n",@code);
147: }
148: &Apache::lonxml::error($errormsg.$code.'</pre>');
1.32 albertel 149: }
150: if ( $#result < '1') {
151: return $result[0];
152: } else {
153: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
154: return (@result);
155: }
1.2 albertel 156: }
157:
1.19 albertel 158: sub dump {
1.42 albertel 159: my ($target,$safeeval)=@_;
160: my $dump='';
161: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
162: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
163: my $line;
164: if ($safeeval->reval('defined($'.$symname.')')) {
165: $line='$'.$symname.'='.$safeeval->reval('$'.$symname);
166: }
167: if ($safeeval->reval('defined(@'.$symname.')')) {
168: $line='@'.$symname.'=('.
169: $safeeval->reval('join(",",@'.$symname.')').")";
170: }
171: if ($safeeval->reval('defined(%'.$symname.')')) {
172: $line='%'.$symname.'=(';
173: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
174: $symname.'{$_} } sort keys %'.
175: $symname.')').")"
176: }
1.46 albertel 177: if ($line ne '') {$dump.=&HTML::Entities::encode($line,'<>&"')."<br />";}
1.42 albertel 178: }
1.19 albertel 179: }
1.42 albertel 180: $dump.='';
181: return $dump;
1.19 albertel 182: }
183:
1.2 albertel 184: 1;
185: __END__;
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