File:
[LON-CAPA] /
loncom /
xml /
run.pm
Revision
1.65:
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Sun Nov 10 20:40:59 2019 UTC (4 years, 9 months ago) by
raeburn
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- Suppress "Use of uninitialized value" (Config.pm line 62) warnings in logs
from reval of perl special hash: %!, in call to &Apache::run::dump()
when creating ScriptVars display for answer target.
package Apache::run;
#
# $Id: run.pm,v 1.65 2019/11/10 20:40:59 raeburn Exp $
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
use HTML::Entities;
use Apache::lonlocal;
$Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
my %_LONCAPA_INTERNAL_oldexpressions=();
while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
$_LONCAPA_INTERNAL_oldexpressions{$_}=1;
$_ =~s/ # $1 will be the variable reference or subroutine name
((?:\$|\&) #look for a starting $ or &
(?:[\#|\$]* #support $$ or $#$ etc.
[A-Za-z][\w]*| # get variable name
\{[A-Za-z][\w]*\})) # for ${a}
# $2 is 0 or more array dereferences []
# or hash dereferences {}
# the ^$ and ^& is because we do this iteratively
# $a[$c] becomes $a[3] which then evaluates
([\[\{][^\$\&\]\}]+[\]\}])*?
# $3 is the list of arguments
(\([^\$\&\)]+\))*?
# only match the above if there is not { [ ( coming up
# Why? (I.e. this fails &a(1)[2]
(?=[^\[\{\(]|$)/
my ($__LC__a,$__LC__b,$__LC__c)=($1,$2,$3);
my $__LC__prefix;
my $__LC__result;
while (1) {
if ($__LC__a =~ m-^&(theta|pi|rho)$-) { last; }
{
use strict;
no strict "vars";
if (eval(defined(eval($__LC__a.$__LC__b)))) {
$__LC__result= $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
last;
}
}
$__LC__prefix.=substr($__LC__a,0,1,"");
if ($__LC__a!~m-^(\$|&|\#)-) { last; }
}
if (!defined($__LC__result)) {
$__LC__result=$__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
}
$__LC__result;
/sexg;
if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
}
ENDEVALUATE
sub evaluate {
my ($expression,$safeeval,$decls) = @_;
unless (defined($expression)) { return ''; }
if ($Apache::lonxml::evaluate < 1) { return $expression; }
my $result = '';
$@='';
$Apache::run::timeout=0;
local $main::SIG{'ALRM'} = sub {
$Apache::run::timeout=1;
die("timeout");
};
my $innererror;
eval {
&Apache::lonxml::start_alarm();
$safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
"\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
$innererror=$@;
&Apache::lonxml::end_alarm();
};
my $error=$@;
if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
$result = $safeeval->reval('return $_;');
chomp $result;
} else {
if ($Apache::run::timeout) {
$error =
&mt('Code ran too long. It ran for more than [_1] seconds.',
$Apache::lonnet::perlvar{'lonScriptTimeout'});
}
&Apache::lonxml::error(
&mt('Substitution on [_1] with [_2] caused:',
'<pre>'. &HTML::Entities::encode($expression,'<>&"').'</pre>',
'<pre>'.&HTML::Entities::encode($decls,'<>&"').'</pre>')
.'<br />'
.'<pre>'.&HTML::Entities::encode($error,'<>&"').' '
.&HTML::Entities::encode($innererror,'<>&"').'</pre>');
}
return $result;
}
sub run {
my ($code,$safeeval,$hideerrors) = @_;
my @result;
$@='';
$Apache::run::timeout=0;
local $main::SIG{'ALRM'} = sub {
$Apache::run::timeout=1;
die("timeout");
};
my $innererror;
eval {
&Apache::lonxml::start_alarm();
@result=$safeeval->reval($code);
$innererror=$@;
&Apache::lonxml::end_alarm();
};
my $error=$@;
if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
if ($Apache::run::timeout) {
$error = &mt('Code ran too long. It ran for more than [_1] seconds.',
$Apache::lonnet::perlvar{'lonScriptTimeout'});
}
$code=&HTML::Entities::encode($code,'<>&"');
if ($innererror=~/line (\d+)/) {
my $linenumber=$1;
my @code=split("\n",$code);
if ($linenumber < scalar(@code)) {
$code[$linenumber-1]=
'<span style="color:red;font-weight:bold;">'.
$code[$linenumber-1].'</span>';
}
$code=join("\n",@code);
}
&Apache::lonxml::error(
'<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
&HTML::Entities::encode($innererror,'<>&"').
'</pre>'
.&mt('This occurred while running: [_1]',
'<pre>'.$code.'</pre>'));
}
if ( $#result < '1') {
return $result[0];
} else {
&Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
return (@result);
}
}
sub dump {
my ($target,$safeeval)=@_;
my $dump='';
foreach my $symname (sort(keys(%{$safeeval->varglob('main::')}))) {
if (($symname!~ /^(INC|SIG)/) && ($symname!~/\027/) && ($symname!~/\022/) &&
($symname!~/^\_/) && ($symname!~/\:$/) && ($symname ne '!')) {
my $line;
if ($safeeval->reval('defined($'.$symname.')')) {
if ($symname =~ /^\w/) {
$line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
}
}
if ($safeeval->reval('@'.$symname)) {
$line.='@'.$symname.'=('.
$safeeval->reval('join(",",@'.$symname.')').")"."\n";
}
if ($safeeval->reval('%'.$symname)) {
$line.='%'.$symname.'=(';
$line.=$safeeval->reval('join(",",map { $_."=>".$'.
$symname.'{$_} } sort(keys(%'.
$symname.')))').")"."\n";
}
if ($line ne '') {
$line=&HTML::Entities::encode($line,'<>&"');
$line=~s|\n|<br />|g;
$dump.=$line;
}
}
}
$dump.='';
return $dump;
}
1;
__END__;
=pod
=head1 NAME
Apache::run.pm
=head1 SYNOPSIS
Used to prevent poorly written problems from
causing lingering after effects
This is part of the LearningOnline Network with CAPA project
described at http://www.lon-capa.org.
=head1 NOTABLE SUBROUTINES
=over
=item run(), dump(), evaluate()
=back
=cut
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