Annotation of loncom/xml/run.pm, revision 1.51
1.2 albertel 1: package Apache::run;
1.21 www 2: #
1.51 ! albertel 3: # $Id: run.pm,v 1.50 2005/02/26 06:10:30 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;
1.49 albertel 51: my $__LC__result;
1.47 albertel 52: while (1) {
53: {
54: use strict;
55: no strict "vars";
56: if (eval(defined(eval($__LC__a.$__LC__b)))) {
1.49 albertel 57: $__LC__result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
1.47 albertel 58: last;
59: }
60: }
61: $__LC__prefix.=substr($__LC__a,0,1,"");
62: if ($__LC__a!~m-^(\$|&|\#)-) { last; }
63: }
1.49 albertel 64: if (!defined($__LC__result)) {
65: $__LC__result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
1.47 albertel 66: }
1.49 albertel 67: $__LC__result;
1.47 albertel 68: /sexg;
1.30 albertel 69: if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
1.45 albertel 70: }
1.11 albertel 71: ENDEVALUATE
72:
1.10 albertel 73: sub evaluate {
1.32 albertel 74: my ($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;
1.32 albertel 85: eval {
1.51 ! albertel 86: &Apache::lonxml::start_alarm();
1.32 albertel 87: $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
88: "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
1.34 albertel 89: $innererror=$@;
1.51 ! albertel 90: &Apache::lonxml::end_alarm();
1.32 albertel 91: };
1.51 ! albertel 92: my $error=$@;
1.34 albertel 93: if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
1.32 albertel 94: $result = $safeeval->reval('return $_;');
95: chomp $result;
96: } else {
97: if ($Apache::run::timeout) {
98: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 99: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 100: }
1.34 albertel 101: &Apache::lonxml::error('substitution on <pre>'.
1.46 albertel 102: &HTML::Entities::encode($expression,'<>&"').
1.34 albertel 103: '</pre> with <pre>'.
1.46 albertel 104: &HTML::Entities::encode($decls,'<>&"').
1.34 albertel 105: '</pre> caused <pre>'.
1.46 albertel 106: &HTML::Entities::encode($error,'<>&"').' '.
107: &HTML::Entities::encode($innererror,'<>&"').
1.34 albertel 108: '</pre>');
1.32 albertel 109: }
110: return $result
1.2 albertel 111: }
112:
113: sub run {
1.32 albertel 114: my ($code,$safeeval,$hideerrors) = @_;
115: my @result;
116: $@='';
117: $Apache::run::timeout=0;
118: $main::SIG{'ALRM'} = sub {
119: $Apache::run::timeout=1;
1.33 albertel 120: die("timeout");
1.32 albertel 121: };
1.34 albertel 122: my $innererror;
1.32 albertel 123: eval {
1.51 ! albertel 124: &Apache::lonxml::start_alarm();
1.32 albertel 125: @result=$safeeval->reval($code);
1.34 albertel 126: $innererror=$@;
1.51 ! albertel 127: &Apache::lonxml::end_alarm();
1.32 albertel 128: };
129: my $error=$@;
1.34 albertel 130: if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
1.32 albertel 131: if ($Apache::run::timeout) {
132: $error = 'Code ran too long. It ran for more than '.
1.43 albertel 133: $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32 albertel 134: }
1.46 albertel 135: my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
136: &HTML::Entities::encode($innererror,'<>&"').
1.40 albertel 137: '</pre> occured while running <pre>';
1.46 albertel 138: $code=&HTML::Entities::encode($code,'<>&"');
1.40 albertel 139: if ($innererror=~/line (\d+)/) {
140: my $linenumber=$1;
141: my @code=split("\n",$code);
142: $code[$linenumber-1]='<b><font color="red">'.
143: $code[$linenumber-1].'</font></b>';
144: $code=join("\n",@code);
145: }
146: &Apache::lonxml::error($errormsg.$code.'</pre>');
1.32 albertel 147: }
148: if ( $#result < '1') {
149: return $result[0];
150: } else {
151: &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
152: return (@result);
153: }
1.2 albertel 154: }
155:
1.19 albertel 156: sub dump {
1.42 albertel 157: my ($target,$safeeval)=@_;
158: my $dump='';
159: foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
160: if (($symname!~/^\_/) && ($symname!~/\:$/)) {
161: my $line;
162: if ($safeeval->reval('defined($'.$symname.')')) {
1.50 albertel 163: if ($symname =~ /^\w/) {
164: $line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
165: }
1.42 albertel 166: }
167: if ($safeeval->reval('defined(@'.$symname.')')) {
1.49 albertel 168: $line.='@'.$symname.'=('.
169: $safeeval->reval('join(",",@'.$symname.')').")"."\n";
1.42 albertel 170: }
171: if ($safeeval->reval('defined(%'.$symname.')')) {
1.49 albertel 172: $line.='%'.$symname.'=(';
1.42 albertel 173: $line.=$safeeval->reval('join(",",map { $_."=>".$'.
174: $symname.'{$_} } sort keys %'.
1.49 albertel 175: $symname.')').")"."\n"
1.42 albertel 176: }
1.49 albertel 177: if ($line ne '') {
178: $line=&HTML::Entities::encode($line,'<>&"');
179: $line=~s|\n|<br />|;
180: $dump.=$line;
181: }
1.42 albertel 182: }
1.19 albertel 183: }
1.42 albertel 184: $dump.='';
185: return $dump;
1.19 albertel 186: }
187:
1.2 albertel 188: 1;
189: __END__;
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