[BACK]Return to run.pm CVS log [TXT] [DIR] Up to [LON-CAPA] / loncom / xml

Diff for /loncom/xml/run.pm between versions 1.19 and 1.60

version 1.19, 2001/10/05 22:27:41 version 1.60, 2008/11/24 18:55:01
Line 1 Line 1
 package Apache::run;  package Apache::run;
   #
 sub evaluateold {  # $Id$
   my ($expression,$safeeval,$decls) = @_;  #
 # print "inside2 evaluate $decls with $expression<br />\n";  # Copyright Michigan State University Board of Trustees
 # gerd's old method interpolates unset vars  #
 # $safeeval->reval('return qq('.$expression.');');  # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   unless (defined $expression) { return ''; }  #
   my $result = '';  # 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
   $safeeval->reval('$_=q|'.$expression.'|;');  # the Free Software Foundation; either version 2 of the License, or
   if ($@ eq '') {  # (at your option) any later version.
     $safeeval->reval('{'.$decls.'$_=~s/(\$[A-Za-z]\w*)/(defined(eval($1))?eval($1):$1)/ge;}');  #
     if ($@ eq '') {  # LON-CAPA is distributed in the hope that it will be useful,
       $result = $safeeval->reval('return $_;');  # but WITHOUT ANY WARRANTY; without even the implied warranty of
     } else {  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
       &Apache::lonxml::error("substitution on:$expression:with:$decls:caused");  # GNU General Public License for more details.
     }  #
   } else {  # You should have received a copy of the GNU General Public License
     &Apache::lonxml::error("defining:$expression:caused");  # along with LON-CAPA; if not, write to the Free Software
   }  # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   if ($@ ne '') {&Apache::lonxml::error($@);}  #
   return $result  # /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]
                   (?=[^\[\{\(]|$)/
    my ($__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;}
 }  }
   
 $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';    
   my %oldexpressions=();  
   while (!$oldexpressions{$_}) {  
     $oldexpressions{$_}=1;  
     $_ =~s/((?:\$|\&)(?:[\#|\$]*[A-Za-z][\w]*|\{[A-Za-z][\w]*\}))([\[\{][^\$\&\]\}]+[\]\}])*?(\([^\$\&\)]+\))*?(?=[^\[\{\(]|$)/eval(defined(eval($1.$2))?eval('$1.$2.$3'):'$1.$2.$3')/seg;  
   }  
 ENDEVALUATE  ENDEVALUATE
   
 sub evaluate {  sub evaluate {
   my ($expression,$safeeval,$decls) = @_;      my ($expression,$safeeval,$decls) = @_;
   unless (defined $expression) { return ''; }      unless (defined($expression)) { return ''; }
   if (!$Apache::lonxml::evaluate) { return $expression; }      if ($Apache::lonxml::evaluate < 1) { return $expression; }
   my $result = '';      my $result = '';
   $@='';      $@='';
   $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.      $Apache::run::timeout=0;
    "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');      local $main::SIG{'ALRM'} = sub {
 #  $safeeval->reval('{'.$decls.';<< &evaluate(q|'.$expression.'|);}');   $Apache::run::timeout=1;
   if ($@ eq '') {   die("timeout");
     $result = $safeeval->reval('return $_;');      };
     chomp $result;      my $innererror;
   } else {      eval {
     &Apache::lonxml::error("substitution on:$expression:with:$decls:caused $@");   &Apache::lonxml::start_alarm();
   }     $safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   return $result   "\n".'EXPRESSION'."\n".$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 = '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,$hideerrors) = @_;      my ($code,$safeeval,$hideerrors) = @_;
 #  print "inside run\n";      my @result;
   $@='';      $@='';
   my (@result)=$safeeval->reval($code);      $Apache::run::timeout=0;
   if ($@ ne '' && !$hideerrors) {      local $main::SIG{'ALRM'} = sub {
     &Apache::lonxml::error(":$code:caused");   $Apache::run::timeout=1;
     &Apache::lonxml::error($@);   die("timeout");
   }      };
   if ( $#result < '1') {      my $innererror;
     return $result[0];      eval {
   } else {   &Apache::lonxml::start_alarm();
     &Apache::lonxml::debug("<b>Got lots results</b>:$#result:");   @result=$safeeval->reval($code);
     return (@result);   $innererror=$@;
   }   &Apache::lonxml::end_alarm();
       };
       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> occurred while running <pre>';
    $code=&HTML::Entities::encode($code,'<>&"');
    if ($innererror=~/line (\d+)/) {
       my $linenumber=$1;
       my @code=split("\n",$code);
       if ($linenumber < scalar(@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 {  sub dump {
   my ($target,$safeeval)=@_;      my ($target,$safeeval)=@_;
   my $dump='';      my $dump='';
   foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {      foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
     if (($symname!~/^\_/) && ($symname!~/\:$/)) {   if (($symname!~ /^(INC|SIG)/) && ($symname!~/\027/) &&
       if ($safeeval->reval('defined $'.$symname)) {      ($symname!~/^\_/) && ($symname!~/\:$/)) {
  $dump.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";      my $line;
       }      if ($safeeval->reval('defined($'.$symname.')')) {
       if ($safeeval->reval('defined @'.$symname)) {   if ($symname =~ /^\w/) {
  $dump.='@'.$symname.'=('.      $line.='$'.$symname.'='.$safeeval->reval('$'.$symname)."\n";
   $safeeval->reval('join(",",@'.$symname.')').")\n";   }
       }      }
       if ($safeeval->reval('defined %'.$symname)) {      if ($safeeval->reval('defined(@'.$symname.')')) {
  $dump.='%'.$symname.'=(';   $line.='@'.$symname.'=('.
  $dump.=$safeeval->reval('join(",",map { $_."=>".$'.      $safeeval->reval('join(",",@'.$symname.')').")"."\n";
  $symname.'{$_} } sort keys %'.      }
  $symname.')').")\n";      if ($safeeval->reval('defined(%'.$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.='';
   $dump.='';      return $dump;
   return $dump;  
 }  }
   
 1;  1;
 __END__;  __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
   
Removed from v.1.19  
changed lines
  Added in v.1.60

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>