Return to run.pm CVS log

Up to [LON-CAPA] / loncom / xml

- trying to be UTF8 transparent

    1: package Apache::run;
    2: #
    3: # $Id: run.pm,v 1.46 2004/03/31 05:24:00 albertel Exp $
    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: #
   27: 
   28: use HTML::Entities;
   29: 
   30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
   31: my %_LONCAPA_INTERNAL_oldexpressions=();
   32: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
   33:     $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
   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:                 (?=[^\[\{\(]|$)/
   49:          &__LC_INTERNAL_EVALUATE__($1,$2,$3)/sexg;
   50:     if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
   51: }
   52: ENDEVALUATE
   53: 
   54: sub evaluate {
   55:     my ($expression,$safeeval,$decls) = @_;
   56:     unless (defined($expression)) { return ''; }
   57:     if ($Apache::lonxml::evaluate < 1) { return $expression; }
   58:     my $result = '';
   59:     $@='';
   60:     $Apache::run::timeout=0;
   61:     $main::SIG{'ALRM'} = sub {
   62: 	$Apache::run::timeout=1;
   63: 	die("timeout");
   64:     };
   65:     my $innererror;
   66:     eval {
   67: 	alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
   68: 	$safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
   69: 			 "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
   70: 	$innererror=$@;
   71: 	alarm(0);
   72:     };
   73:     my $error=$@;
   74:     if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
   75: 	$result = $safeeval->reval('return $_;');
   76: 	chomp $result;
   77:     } else {
   78: 	if ($Apache::run::timeout) {
   79: 	    $error = 'Code ran too long. It ran for more than '.
   80: 		$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
   81: 	}
   82: 	&Apache::lonxml::error('substitution on <pre>'.
   83: 			       &HTML::Entities::encode($expression,'<>&"').
   84: 			       '</pre> with <pre>'.
   85: 			       &HTML::Entities::encode($decls,'<>&"').
   86: 			       '</pre> caused <pre>'.
   87: 			       &HTML::Entities::encode($error,'<>&"').' '.
   88: 			       &HTML::Entities::encode($innererror,'<>&"').
   89: 			       '</pre>');
   90:     }
   91:     return $result
   92: }
   93: 
   94: sub run {
   95:     my ($code,$safeeval,$hideerrors) = @_;
   96:     my @result;
   97:     $@='';
   98:     $Apache::run::timeout=0;
   99:     $main::SIG{'ALRM'} = sub {
  100: 	$Apache::run::timeout=1;
  101: 	die("timeout");
  102:     };
  103:     my $innererror;
  104:     eval {
  105: 	alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
  106: 	@result=$safeeval->reval($code);
  107: 	$innererror=$@;
  108: 	alarm(0);
  109:     };
  110:     my $error=$@;
  111:     if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
  112: 	if ($Apache::run::timeout) {
  113: 	    $error = 'Code ran too long. It ran for more than '.
  114: 		$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
  115: 	}
  116: 	my $errormsg='<pre>'.&HTML::Entities::encode($error,'<>&"').' '.
  117: 	    &HTML::Entities::encode($innererror,'<>&"').
  118: 	    '</pre> occured while running <pre>';
  119: 	$code=&HTML::Entities::encode($code,'<>&"');
  120: 	if ($innererror=~/line (\d+)/) {
  121: 	    my $linenumber=$1;
  122: 	    my @code=split("\n",$code);
  123: 	    $code[$linenumber-1]='<b><font color="red">'.
  124: 		$code[$linenumber-1].'</font></b>';
  125: 	    $code=join("\n",@code);
  126: 	}
  127: 	&Apache::lonxml::error($errormsg.$code.'</pre>');
  128:     }
  129:     if ( $#result < '1') {
  130: 	return $result[0];
  131:     } else {
  132: 	&Apache::lonxml::debug("<b>Got lots results</b>:$#result:");
  133: 	return (@result);
  134:     }
  135: }
  136: 
  137: sub dump {
  138:     my ($target,$safeeval)=@_;
  139:     my $dump='';
  140:     foreach my $symname (sort keys %{$safeeval->varglob('main::')}) {
  141: 	if (($symname!~/^\_/) && ($symname!~/\:$/)) {
  142: 	    my $line;
  143: 	    if ($safeeval->reval('defined($'.$symname.')')) {
  144: 		$line='$'.$symname.'='.$safeeval->reval('$'.$symname);
  145: 	    }	
  146: 	    if ($safeeval->reval('defined(@'.$symname.')')) {
  147: 		$line='@'.$symname.'=('.
  148: 		    $safeeval->reval('join(",",@'.$symname.')').")";
  149: 	    }
  150: 	    if ($safeeval->reval('defined(%'.$symname.')')) {
  151: 		$line='%'.$symname.'=(';
  152: 		$line.=$safeeval->reval('join(",",map { $_."=>".$'.
  153: 					$symname.'{$_} } sort keys %'.
  154: 					$symname.')').")"
  155: 				    }
  156: 	    if ($line ne '') {$dump.=&HTML::Entities::encode($line,'<>&"')."<br />";}
  157: 	}
  158:     }
  159:     $dump.='';
  160:     return $dump;
  161: }
  162: 
  163: 1;
  164: __END__;