File:
[LON-CAPA] /
loncom /
xml /
run.pm
Revision
1.58:
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Thu Mar 16 15:47:37 2006 UTC (18 years, 6 months ago) by
albertel
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CVS tags:
version_2_7_0,
version_2_6_X,
version_2_6_99_1,
version_2_6_99_0,
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,
version_2_4_X,
version_2_4_99_0,
version_2_4_2,
version_2_4_1,
version_2_4_0,
version_2_3_X,
version_2_3_99_0,
version_2_3_2,
version_2_3_1,
version_2_3_0,
version_2_2_X,
version_2_2_99_1,
version_2_2_99_0,
version_2_2_2,
version_2_2_1,
version_2_2_0,
version_2_1_99_3,
version_2_1_99_2,
version_2_1_99_1,
version_2_1_99_0,
HEAD
- bug #4702
1: package Apache::run;
2: #
3: # $Id: run.pm,v 1.58 2006/03/16 15:47:37 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/ # $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: (?=[^\[\{\(]|$)/
49: my ($__LC__a,$__LC__b,$__LC__c)=($1,$2,$3);
50: my $__LC__prefix;
51: my $__LC__result;
52: while (1) {
53: if ($__LC__a =~ m-^&(theta|pi|rho)$-) { last; }
54: {
55: use strict;
56: no strict "vars";
57: if (eval(defined(eval($__LC__a.$__LC__b)))) {
58: $__LC__result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
59: last;
60: }
61: }
62: $__LC__prefix.=substr($__LC__a,0,1,"");
63: if ($__LC__a!~m-^(\$|&|\#)-) { last; }
64: }
65: if (!defined($__LC__result)) {
66: $__LC__result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
67: }
68: $__LC__result;
69: /sexg;
70: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
71: }
72: ENDEVALUATE
73:
74: sub evaluate {
75: my ($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;
81: local $main::SIG{'ALRM'} = sub {
82: $Apache::run::timeout=1;
83: die("timeout");
84: };
85: my $innererror;
86: eval {
87: &Apache::lonxml::start_alarm();
88: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
89: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
90: $innererror=$@;
91: &Apache::lonxml::end_alarm();
92: };
93: my $error=$@;
94: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
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 '.
100: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
101: }
102: &Apache::lonxml::error('substitution on <pre>'.
103: &HTML::Entities::encode($expression,'<>&"').
104: '</pre> with <pre>'.
105: &HTML::Entities::encode($decls,'<>&"').
106: '</pre> caused <pre>'.
107: &HTML::Entities::encode($error,'<>&"').' '.
108: &HTML::Entities::encode($innererror,'<>&"').
109: '</pre>');
110: }
111: return $result
112: }
113:
114: sub run {
115: my ($code,$safeeval,$hideerrors) = @_;
116: my @result;
117: $@='';
118: $Apache::run::timeout=0;
119: local $main::SIG{'ALRM'} = sub {
120: $Apache::run::timeout=1;
121: die("timeout");
122: };
123: my $innererror;
124: eval {
125: &Apache::lonxml::start_alarm();
126: @result=$safeeval->reval($code);
127: $innererror=$@;
128: &Apache::lonxml::end_alarm();
129: };
130: my $error=$@;
131: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
132: if ($Apache::run::timeout) {
133: $error = 'Code ran too long. It ran for more than '.
134: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
135: }
136: my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
137: &HTML::Entities::encode($innererror,'<>&"').
138: '</pre> occured while running <pre>';
139: $code=&HTML::Entities::encode($code,'<>&"');
140: if ($innererror=~/line (\d+)/) {
141: my $linenumber=$1;
142: my @code=split("\n",$code);
143: if ($linenumber < scalar(@code)) {
144: $code[$linenumber-1]='<b><font color="red">'.
145: $code[$linenumber-1].'</font></b>';
146: }
147: $code=join("\n",@code);
148: }
149: &Apache::lonxml::error($errormsg.$code.'</pre>');
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: }
157: }
158:
159: sub dump {
160: my ($target,$safeeval)=@_;
161: my $dump='';
162: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
163: if (($symname!~ /^(INC|SIG)/) && ($symname!~/\027/) &&
164: ($symname!~/^\_/) && ($symname!~/\:$/)) {
165: my $line;
166: if ($safeeval->reval('defined($'.$symname.')')) {
167: if ($symname =~ /^\w/) {
168: $line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
169: }
170: }
171: if ($safeeval->reval('defined(@'.$symname.')')) {
172: $line.='@'.$symname.'=('.
173: $safeeval->reval('join(",",@'.$symname.')').")"."\n";
174: }
175: if ($safeeval->reval('defined(%'.$symname.')')) {
176: $line.='%'.$symname.'=(';
177: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
178: $symname.'{$_} } sort keys %'.
179: $symname.')').")"."\n";
180: }
181: if ($line ne '') {
182: $line=&HTML::Entities::encode($line,'<>&"');
183: $line=~s|\n|<br />|g;
184: $dump.=$line;
185: }
186: }
187: }
188: $dump.='';
189: return $dump;
190: }
191:
192: 1;
193: __END__;
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