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Annotation of loncom/xml/run.pm, revision 1.45

1.2       albertel    1: package Apache::run;
1.21      www         2: #
1.45    ! albertel    3: # $Id: run.pm,v 1.44 2004/02/26 22:08:54 albertel Exp $
1.21      www         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: #
1.1       sakharuk   27: 
1.26      albertel   28: use HTML::Entities;
                     29: 
1.45    ! albertel   30: $Apache::run::EVALUATE_STRING=<<'ENDEVALUATE';
        !            31: my %_LONCAPA_INTERNAL_oldexpressions=();
        !            32: while (!$_LONCAPA_INTERNAL_oldexpressions{$_}) {
1.24      albertel   33:     $_LONCAPA_INTERNAL_oldexpressions{$_}=1;
1.45    ! albertel   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,$3)/sexg;
1.30      albertel   50:     if (scalar(values(%_LONCAPA_INTERNAL_oldexpressions))>10) {last;}
1.45    ! albertel   51: }
1.11      albertel   52: ENDEVALUATE
                     53: 
1.10      albertel   54: sub evaluate {
1.32      albertel   55:     my ($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;
1.33      albertel   63: 	die("timeout");
1.32      albertel   64:     };
1.34      albertel   65:     my $innererror;
1.32      albertel   66:     eval {
1.35      albertel   67: 	alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
1.32      albertel   68: 	$safeeval->reval('{'.$decls.';$_=<<\'EXPRESSION\';'."\n".$expression.
                     69: 			 "\n".'EXPRESSION'."\n".$EVALUATE_STRING.'}');
1.34      albertel   70: 	$innererror=$@;
1.32      albertel   71: 	alarm(0);
                     72:     };
                     73:     my $error=$@;
1.34      albertel   74:     if ($error eq '' && $innererror eq '' && !$Apache::run::timeout) {
1.32      albertel   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 '.
1.43      albertel   80: 		$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32      albertel   81: 	}
1.34      albertel   82: 	&Apache::lonxml::error('substitution on <pre>'.
                     83: 			       &HTML::Entities::encode($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>');
1.32      albertel   90:     }
                     91:     return $result
1.2       albertel   92: }
                     93: 
                     94: sub run {
1.32      albertel   95:     my ($code,$safeeval,$hideerrors) = @_;
                     96:     my @result;
                     97:     $@='';
                     98:     $Apache::run::timeout=0;
                     99:     $main::SIG{'ALRM'} = sub {
                    100: 	$Apache::run::timeout=1;
1.33      albertel  101: 	die("timeout");
1.32      albertel  102:     };
1.34      albertel  103:     my $innererror;
1.32      albertel  104:     eval {
1.35      albertel  105: 	alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
1.32      albertel  106: 	@result=$safeeval->reval($code);
1.34      albertel  107: 	$innererror=$@;
1.32      albertel  108: 	alarm(0);
                    109:     };
                    110:     my $error=$@;
1.34      albertel  111:     if (($Apache::run::timeout || $error ne '' || $innererror ne '') && !$hideerrors) {
1.32      albertel  112: 	if ($Apache::run::timeout) {
                    113: 	    $error = 'Code ran too long. It ran for more than '.
1.43      albertel  114: 		$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds';
1.32      albertel  115: 	}
1.40      albertel  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>');
1.32      albertel  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:     }
1.2       albertel  135: }
                    136: 
1.19      albertel  137: sub dump {
1.42      albertel  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: 	}
1.19      albertel  158:     }
1.42      albertel  159:     $dump.='';
                    160:     return $dump;
1.19      albertel  161: }
                    162: 
1.2       albertel  163: 1;
                    164: __END__;