package Apache::run;
#
# $Id: run.pm,v 1.33 2003/03/25 03:00:31 albertel 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;
$Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
my %_LONCAPA_INTERNAL_oldexpressions=();
while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
$_LONCAPA_INTERNAL_oldexpressions{$_}=1;
$_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;
if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
}
ENDEVALUATE
sub evaluate {
my ($expression,$safeeval,$decls) = @_;
unless (defined($expression)) { return ''; }
if ($Apache::lonxml::evaluate < 1) { return $expression; }
my $result = '';
$@='';
$Apache::run::timeout=0;
$main::SIG{'ALRM'} = sub {
$Apache::run::timeout=1;
die("timeout");
};
eval {
alarm(Apache->request->server->timeout);
$safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
"\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
alarm(0);
};
my $error=$@;
if ($error eq '' && !$Apache::run::timeout) {
$result = $safeeval->reval('return $_;');
chomp $result;
} else {
if ($Apache::run::timeout) {
$error = 'Code ran too long. It ran for more than '.
Apache->request->server->timeout.' seconds';
}
&Apache::lonxml::error('substitution on <pre>'.$expression.
'</pre> with <pre>'.$decls.
'</pre> caused <pre>'.$error);
}
return $result
}
sub run {
my ($code,$safeeval,$hideerrors) = @_;
my @result;
$@='';
$Apache::run::timeout=0;
$main::SIG{'ALRM'} = sub {
$Apache::run::timeout=1;
die("timeout");
};
eval {
alarm(Apache->request->server->timeout);
@result=$safeeval->reval($code);
alarm(0);
};
my $error=$@;
if (($Apache::run::timeout || $error ne '') && !$hideerrors) {
if ($Apache::run::timeout) {
$error = 'Code ran too long. It ran for more than '.
Apache->request->server->timeout.' seconds';
}
&Apache::lonxml::error('<pre>'.&HTML::Entities::encode($error).
'</pre> occured while running <pre>'.
&HTML::Entities::encode($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 (($symname!~/^\_/) && ($symname!~/\:$/)) {
my $line;
if ($safeeval->reval('defined($'.$symname.')')) {
$line='$'.$symname.'='.$safeeval->reval('$'.$symname);
}
if ($safeeval->reval('defined(@'.$symname.')')) {
$line='@'.$symname.'=('.
$safeeval->reval('join(",",@'.$symname.')').")";
}
if ($safeeval->reval('defined(%'.$symname.')')) {
$line='%'.$symname.'=(';
$line.=$safeeval->reval('join(",",map { $_."=>".$'.
$symname.'{$_} } sort keys %'.
$symname.')').")"
}
if ($line ne '') { $dump.=&HTML::Entities::encode($line)."<br />\n"; }
}
}
$dump.='';
return $dump;
}
1;
__END__;
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