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Diff for /loncom/xml/run.pm between versions 1.5 and 1.46

version 1.5, 2000/06/29 20:27:44 version 1.46, 2004/03/31 05:24:00
Line 1 Line 1
 package Apache::run;  package Apache::run;
   #
   # $Id$
   #
   # 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/  # $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]
                   (?=[^\[\{\(]|$)/
            &__LC_INTERNAL_EVALUATE__($1,$2,$3)/sexg;
       if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
   }
   ENDEVALUATE
   
 sub evaluate {  sub evaluate {
   my ($expression,$safeeval,$decls) = @_;      my ($expression,$safeeval,$decls) = @_;
 # print "inside2 evaluate with $expression\n";      unless (defined($expression)) { return ''; }
 # gerd's old method interpolates unset vars      if ($Apache::lonxml::evaluate < 1) { return $expression; }
 # $safeeval->reval('return qq('.$expression.');');      my $result = '';
   unless (defined $expression) { return ''; }      $@='';
   $safeeval->reval('$_=\''.$expression.'\';');      $Apache::run::timeout=0;
   $safeeval->reval('{'.$decls.'$_=~s/(\$\{?[A-Za-z]\w*\}?)/(defined(eval($1))?eval($1):$1)/ge;}');      $main::SIG{'ALRM'} = sub {
   $safeeval->reval('return $_;');   $Apache::run::timeout=1;
    die("timeout");
       };
       my $innererror;
       eval {
    alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
    $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
    "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
    $innererror=$@;
    alarm(0);
       };
       my $error=$@;
       if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
    $result = $safeeval->reval('return $_;');
    chomp $result;
       } else {
    if ($Apache::run::timeout) {
       $error = 'Code ran too long. It ran for more than '.
    $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
    }
    &Apache::lonxml::error('substitution on <pre>'.
          &HTML::Entities::encode($expression,'<>&"').
          '</pre> with <pre>'.
          &HTML::Entities::encode($decls,'<>&"').
          '</pre> caused <pre>'.
          &HTML::Entities::encode($error,'<>&"').' '.
          &HTML::Entities::encode($innererror,'<>&"').
          '</pre>');
       }
       return $result
 }  }
   
 sub run {  sub run {
   my ($code,$safeeval) = @_;      my ($code,$safeeval,$hideerrors) = @_;
 #  print "inside run\n";      my @result;
   $safeeval->reval($code);      $@='';
       $Apache::run::timeout=0;
       $main::SIG{'ALRM'} = sub {
    $Apache::run::timeout=1;
    die("timeout");
       };
       my $innererror;
       eval {
    alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
    @result=$safeeval->reval($code);
    $innererror=$@;
    alarm(0);
       };
       my $error=$@;
       if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
    if ($Apache::run::timeout) {
       $error = 'Code ran too long. It ran for more than '.
    $Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
    }
    my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
       &HTML::Entities::encode($innererror,'<>&"').
       '</pre> occured while running <pre>';
    $code=&HTML::Entities::encode($code,'<>&"');
    if ($innererror=~/line (\d+)/) {
       my $linenumber=$1;
       my @code=split("\n",$code);
       $code[$linenumber-1]='<b><font color="red">'.
    $code[$linenumber-1].'</font></b>';
       $code=join("\n",@code);
    }
    &Apache::lonxml::error($errormsg.$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 />";}
    }
       }
       $dump.='';
       return $dump;
 }  }
   
 1;  1;
Removed from v.1.5  
changed lines
  Added in v.1.46

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