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Diff for /loncom/xml/lonxml.pm between versions 1.14 and 1.319

version 1.14, 2000/08/02 16:47:53 version 1.319, 2004/05/27 04:25:13
Line 1 Line 1
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # XML Parser Module   # XML Parser Module 
 #  #
 # last modified 06/26/00 by Alexander Sakharuk  # $Id$
   #
   # 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/
   #
   # Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
   # TtHfunc and TtMfunc (the "Code") may be compiled and linked into 
   # binary executable programs or libraries distributed by the 
   # Michigan State University (the "Licensee"), but any binaries so 
   # distributed are hereby licensed only for use in the context
   # of a program or computational system for which the Licensee is the 
   # primary author or distributor, and which performs substantial 
   # additional tasks beyond the translation of (La)TeX into HTML.
   # The C source of the Code may not be distributed by the Licensee
   # to any other parties under any circumstances.
   #
   
 package Apache::lonxml;   
   
   package Apache::lonxml; 
   use vars 
   qw(@pwd @outputstack $redirection $import @extlinks $metamode $evaluate %insertlist @namespace $errorcount $warningcount);
 use strict;  use strict;
 use HTML::TokeParser;  use HTML::LCParser();
 use Safe;  use HTML::TreeBuilder();
 use Opcode;  use HTML::Entities();
   use Safe();
   use Safe::Hole();
   use Math::Cephes();
   use Math::Random();
   use Opcode();
   use POSIX qw(strftime);
   
   
 sub register {  sub register {
   my $space;    my ($space,@taglist) = @_;
   my @taglist;    foreach my $temptag (@taglist) {
   my $temptag;      push(@{ $Apache::lonxml::alltags{$temptag} },$space);
   ($space,@taglist) = @_;  
   foreach $temptag (@taglist) {  
     $Apache::lonxml::alltags{$temptag}=$space;  
   }    }
 }  }
                                        
 use Apache::style;  sub deregister {
 use Apache::lontexconvert;    my ($space,@taglist) = @_;
 use Apache::run;    foreach my $temptag (@taglist) {
 use Apache::londefdef;      my $tempspace = $Apache::lonxml::alltags{$temptag}[-1];
 use Apache::scripttag;      if ($tempspace eq $space) {
         pop(@{ $Apache::lonxml::alltags{$temptag} });
       }
     }
     #&printalltags();
   }
   
   use Apache::Constants qw(:common);
   use Apache::lontexconvert();
   use Apache::style();
   use Apache::run();
   use Apache::londefdef();
   use Apache::scripttag();
   use Apache::languagetags();
   use Apache::edit();
   use Apache::inputtags();
   use Apache::outputtags();
   use Apache::lonnet();
   use Apache::File();
   use Apache::loncommon();
   use Apache::lonfeedback();
   use Apache::lonmsg();
   use Apache::loncacc();
   use Apache::lonlocal;
   
 #==================================================   Main subroutine: xmlparse    #==================================================   Main subroutine: xmlparse  
   #debugging control, to turn on debugging modify the correct handler
   $Apache::lonxml::debug=0;
   
   # keeps count of the number of warnings and errors generated in a parse
   $warningcount=0;
   $errorcount=0;
   
   #path to the directory containing the file currently being processed
   @pwd=();
   
   #these two are used for capturing a subset of the output for later processing,
   #don't touch them directly use &startredirection and &endredirection
   @outputstack = ();
   $redirection = 0;
   
   #controls wheter the <import> tag actually does
   $import = 1;
   @extlinks=();
   
   # meta mode is a bit weird only some output is to be turned off
   #<output> tag turns metamode off (defined in londefdef.pm)
   $metamode = 0;
   
   # turns on and of run::evaluate actually derefencing var refs
   $evaluate = 1;
   
   # data structure for eidt mode, determines what tags can go into what other tags
   %insertlist=();
   
   # stores the list of active tag namespaces
   @namespace=();
   
   # has the dynamic menu been updated to know about this resource
   $Apache::lonxml::registered=0;
   
   # a pointer the the Apache request object
   $Apache::lonxml::request='';
   
   # a problem number counter, and check on ether it is used
   $Apache::lonxml::counter=1;
   $Apache::lonxml::counter_changed=0;
   
   #internal check on whether to look at style defs
   $Apache::lonxml::usestyle=1;
   
   #locations used to store the parameter string for style substitutions
   $Apache::lonxml::style_values='';
   $Apache::lonxml::style_end_values='';
   
   #array of ssi calls that need to occur after we are done parsing
   @Apache::lonxml::ssi_info=();
   
   #should we do the postag variable interpolation
   $Apache::lonxml::post_evaluate=1;
   
   #a header message to emit in the case of any generated warning or errors
   $Apache::lonxml::warnings_error_header='';
   
   sub xmlbegin {
     my $output='';
     if ($ENV{'browser.mathml'}) {
         $output='<?xml version="1.0"?>'
               .'<?xml-stylesheet type="text/css" href="/adm/MathML/mathml.css"?>'
               .'<!DOCTYPE html SYSTEM "/adm/MathML/mathml.dtd" '
               .'[<!ENTITY mathns "http://www.w3.org/1998/Math/MathML">]>'
               .'<html xmlns:math="http://www.w3.org/1998/Math/MathML" ' 
    .'xmlns="http://www.w3.org/TR/REC-html40">';
     } else {
         $output='<html>';
     }
     return $output;
   }
   
   sub xmlend {
       my $mode='xml';
       my $status='OPEN';
       if ($Apache::lonhomework::parsing_a_problem) {
    $mode='problem';
    $status=$Apache::inputtags::status[-1]; 
       }
       return &Apache::lonfeedback::list_discussion($mode,$status).'</html>';
   }
   
   sub tokeninputfield {
       my $defhost=$Apache::lonnet::perlvar{'lonHostID'};
       $defhost=~tr/a-z/A-Z/;
       return (<<ENDINPUTFIELD)
   <script type="text/javascript">
       function updatetoken() {
    var comp=new Array;
           var barcode=unescape(document.tokeninput.barcode.value);
           comp=barcode.split('*');
           if (typeof(comp[0])!="undefined") {
       document.tokeninput.codeone.value=comp[0];
    }
           if (typeof(comp[1])!="undefined") {
       document.tokeninput.codetwo.value=comp[1];
    }
           if (typeof(comp[2])!="undefined") {
               comp[2]=comp[2].toUpperCase();
       document.tokeninput.codethree.value=comp[2];
    }
           document.tokeninput.barcode.value='';
       }  
   </script>
   <form method="post" name="tokeninput">
   <table border="2" bgcolor="#FFFFBB">
   <tr><th>DocID Checkin</th></tr>
   <tr><td>
   <table>
   <tr>
   <td>Scan in Barcode</td>
   <td><input type="text" size="22" name="barcode" 
   onChange="updatetoken()"/></td>
   </tr>
   <tr><td><i>or</i> Type in DocID</td>
   <td>
   <input type="text" size="5" name="codeone" />
   <b><font size="+2">*</font></b>
   <input type="text" size="5" name="codetwo" />
   <b><font size="+2">*</font></b>
   <input type="text" size="10" name="codethree" value="$defhost" 
   onChange="this.value=this.value.toUpperCase()" />
   </td></tr>
   </table>
   </td></tr>
   <tr><td><input type="submit" value="Check in DocID" /></td></tr>
   </table>
   </form>
   ENDINPUTFIELD
   }
   
   sub maketoken {
       my ($symb,$tuname,$tudom,$tcrsid)=@_;
       unless ($symb) {
    $symb=&Apache::lonnet::symbread();
       }
       unless ($tuname) {
    $tuname=$ENV{'user.name'};
           $tudom=$ENV{'user.domain'};
           $tcrsid=$ENV{'request.course.id'};
       }
   
       return &Apache::lonnet::checkout($symb,$tuname,$tudom,$tcrsid);
   }
   
   sub printtokenheader {
       my ($target,$token,$tsymb,$tcrsid,$tudom,$tuname)=@_;
       unless ($token) { return ''; }
   
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
       unless ($tsymb) {
    $tsymb=$symb;
       }
       unless ($tuname) {
    $tuname=$name;
           $tudom=$domain;
           $tcrsid=$courseid;
       }
   
       my %reply=&Apache::lonnet::get('environment',
                 ['firstname','middlename','lastname','generation'],
                 $tudom,$tuname);
       my $plainname=$reply{'firstname'}.' '. 
                     $reply{'middlename'}.' '.
                     $reply{'lastname'}.' '.
     $reply{'generation'};
   
       if ($target eq 'web') {
           my %idhash=&Apache::lonnet::idrget($tudom,($tuname));
    return 
    '<img align="right" src="/cgi-bin/barcode.png?encode='.$token.'" />'.
                  &mt('Checked out for').' '.$plainname.
                  '<br />'.&mt('User').': '.$tuname.' at '.$tudom.
          '<br />'.&mt('ID').': '.$idhash{$tuname}.
          '<br />'.&mt('CourseID').': '.$tcrsid.
          '<br />'.&mt('Course').': '.$ENV{'course.'.$tcrsid.'.description'}.
                  '<br />'.&mt('DocID').': '.$token.
                  '<br />'.&mt('Time').': '.&Apache::lonlocal::locallocaltime().'<hr />';
       } else {
           return $token;
       }
   }
   
   sub fontsettings() {
       my $headerstring='';
       if (($ENV{'browser.os'} eq 'mac') && (!$ENV{'browser.mathml'})) { 
    $headerstring.=
       '<meta Content-Type="text/html; charset=x-mac-roman">';
       } elsif (!$ENV{'browser.mathml'} && $ENV{'browser.unicode'}) {
    $headerstring.=
       '<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />';
       }
       return $headerstring;
   }
   
   sub printalltags {
     my $temp;
     foreach $temp (sort keys %Apache::lonxml::alltags) {
       &Apache::lonxml::debug("$temp -- ".
     join(',',@{ $Apache::lonxml::alltags{$temp} }));
     }
   }
   
 sub xmlparse {  sub xmlparse {
    my ($request,$target,$content_file_string,$safeinit,%style_for_target) = @_;
   
    &setup_globals($request,$target);
    &Apache::inputtags::initialize_inputtags();
    &Apache::outputtags::initialize_outputtags();
    &Apache::edit::initialize_edit();
    &Apache::londefdef::initialize_londefdef();
   
   #
   # do we have a course style file?
   #
   
    if ($ENV{'request.course.id'} && $ENV{'request.state'} ne 'construct') {
        my $bodytext=
    $ENV{'course.'.$ENV{'request.course.id'}.'.default_xml_style'};
        if ($bodytext) {
          my $location=&Apache::lonnet::filelocation('',$bodytext);
          my $styletext=&Apache::lonnet::getfile($location);
          if ($styletext ne '-1') {
             %style_for_target = (%style_for_target,
                             &Apache::style::styleparser($target,$styletext));
          }
       }
    } elsif ($ENV{'construct.style'} && ($ENV{'request.state'} eq 'construct')) {
        my $location=&Apache::lonnet::filelocation('',$ENV{'construct.style'});
        my $styletext=&Apache::lonnet::getfile($location);
          if ($styletext ne '-1') {
             %style_for_target = (%style_for_target,
                             &Apache::style::styleparser($target,$styletext));
         }
    }
   #&printalltags();
    my @pars = ();
    my $pwd=$ENV{'request.filename'};
    $pwd =~ s:/[^/]*$::;
    &newparser(\@pars,\$content_file_string,$pwd);
   
  my ($target,$content_file_string,%style_for_target) = @_;  
  my $pars = HTML::TokeParser->new(\$content_file_string);  
  my $currentstring = '';  
  my $finaloutput = '';   
  my $newarg = '';  
  my $safeeval = new Safe;   my $safeeval = new Safe;
  $safeeval->permit("entereval");   my $safehole = new Safe::Hole;
  $safeeval->permit(":base_math");   &init_safespace($target,$safeeval,$safehole,$safeinit);
 #-------------------- Redefinition of the target in the case of compound target  #-------------------- Redefinition of the target in the case of compound target
   
  ($target, my @tenta) = split('&&',$target);   ($target, my @tenta) = split('&&',$target);
   
 #------------------------- Stack definition (in stack we have all current tags)   my @stack = ();
   
  my @stack = ();   
  my @parstack = ();   my @parstack = ();
    &initdepth;
   
 #------------------------------------- Parse input string (content_file_string)   my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars,
       $safeeval,\%style_for_target);
  my $token;  
     if ($ENV{'request.uri'}) {
  while ($token = $pars->get_token) {      &writeallows($ENV{'request.uri'});
    if ($token->[0] eq 'T') {  
      $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');  
    } elsif ($token->[0] eq 'S') {  
      # add tag to stack      
      push (@stack,$token->[1]);  
      # add parameters list to another stack  
      push (@parstack,&parstring($token));  
        
      if (exists $style_for_target{$token->[1]}) {  
        #basically recurse, but we never got more than one level down so just   
        #create the new context here  
        my @innerstack = ();   
        my @innerparstack = ();  
        # use style file definition  
        $newarg = $style_for_target{$token->[1]};         
        my $pat = HTML::TokeParser->new(\$newarg);  
        my $tokenpat = '';  
        my $partstring = '';  
   
        while  ($tokenpat = $pat->get_token) {  
  if ($tokenpat->[0] eq 'T') {  
    $partstring = $tokenpat->[1];  
  } elsif ($tokenpat->[0] eq 'S') {  
    push (@innerstack,$tokenpat->[1]);  
    push (@innerparstack,&parstring($tokenpat));  
    $partstring = &callsub("start_$tokenpat->[1]",   
   $target, $tokenpat, \@innerparstack,  
   $pat, $safeeval, \%style_for_target);  
  } elsif ($tokenpat->[0] eq 'E') {  
    #clear out any tags that didn't end  
    while ($tokenpat->[1] ne $innerstack[$#innerstack]   
   && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}  
    $partstring = &callsub("end_$tokenpat->[1]",  
   $target, $tokenpat, \@innerparstack,  
   $pat, $safeeval, \%style_for_target);  
  }  
  #pass both the variable to the style tag, and the tag we   
  #are processing inside the <definedtag>  
  if ($partstring ne "" ) {  
    $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,  
  $parstack[$#parstack].$innerparstack[$#innerparstack]);  
  }  
  if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }  
        }  
      } else {  
        my $result = &callsub("start_$token->[1]", $target, $token,\@parstack,  
      $pars, $safeeval, \%style_for_target);  
        if ($result ne "" ) {  
  $finaloutput .= &Apache::run::evaluate($result,$safeeval,  
  $parstack[$#parstack]);  
        }  
      }                
    } elsif ($token->[0] eq 'E')  {  
      #clear out any tags that didn't end  
      while ($token->[1] ne $stack[$#stack]   
     && ($#stack > 0)) {pop @stack;pop @parstack;}  
   
      if (exists $style_for_target{'/'."$token->[1]"}) {  
        my @innerstack = ();   
        my @innerparstack = ();  
        $newarg = $style_for_target{'/'."$token->[1]"};  
        my $pat = HTML::TokeParser->new(\$newarg);  
        my $tokenpat;  
        my $partstring = '';  
          
        while  ($tokenpat = $pat->get_token) {  
  if ($tokenpat->[0] eq 'T') {  
    $partstring = $tokenpat->[1];  
  } elsif ($tokenpat->[0] eq 'S') {  
    push (@innerstack,$tokenpat->[1]);  
    push (@innerparstack,&parstring($tokenpat));  
    $partstring = &callsub("start_$tokenpat->[1]",   
   $target, $tokenpat, \@innerparstack,  
   $pat, $safeeval, \%style_for_target);  
  } elsif ($tokenpat->[0] eq 'E') {  
    #clear out any tags that didn't end  
    while ($tokenpat->[1] ne $innerstack[$#innerstack]   
   && ($#innerstack > 0)) {pop @innerstack;pop @innerparstack;}  
    $partstring = &callsub("end_$tokenpat->[1]",  
   $target, $tokenpat, \@innerparstack,  
   $pat, $safeeval, \%style_for_target);  
  }  
  #pass both the variable to the style tag, and the tag we   
  #are processing inside the <definedtag>  
  if ( $partstring ne "" ) {  
    $finaloutput .= &Apache::run::evaluate($partstring,$safeeval,  
  $parstack[$#parstack].$innerparstack[$#innerparstack]);  
  }  
  if ($tokenpat->[0] eq 'E') { pop @innerstack;pop @innerparstack; }  
        }  
      } else {  
        my $result = &callsub("end_$token->[1]", $target, $token, \@parstack,  
      $pars,$safeeval, \%style_for_target);  
        if ($result ne "") {  
  $finaloutput .= &Apache::run::evaluate($result,$safeeval,  
  $parstack[$#parstack]);  
        }  
      }  
      pop @stack;   
      pop @parstack;  
    }  
  }   }
    &do_registered_ssi();
    if ($Apache::lonxml::counter_changed) { &store_counter() }
  return $finaloutput;   return $finaloutput;
 }  }
   
   sub htmlclean {
       my ($raw,$full)=@_;
   
       my $tree = HTML::TreeBuilder->new;
       $tree->ignore_unknown(0);
   
       $tree->parse($raw);
   
       my $output= $tree->as_HTML(undef,' ');
   
       $output=~s/\<(br|hr|img|meta|allow)(.*?)\>/\<$1$2 \/\>/gis;
       $output=~s/\<\/(br|hr|img|meta|allow)\>//gis;
       unless ($full) {
          $output=~s/\<[\/]*(body|head|html)\>//gis;
       }
   
       $tree = $tree->delete;
   
       return $output;
   }
   
   sub latex_special_symbols {
       my ($string,$where)=@_;
       if ($where eq 'header') {
    $string =~ s/(\\|_|\^)/ /g;
    $string =~ s/(\$|%|\{|\})/\\$1/g;
    $string =~ s/_/ /g;
    $string=&Apache::lonprintout::character_chart($string);
    # any & or # leftover should be safe to just escape
           $string=~s/([^\\])\&/$1\\\&/g;
           $string=~s/([^\\])\#/$1\\\#/g;
       } else {
    $string=~s/\\/\\ensuremath{\\backslash}/g;
    $string=~s/([^\\]|^)\%/$1\\\%/g;
    $string=~s/([^\\]|^)(\$|_)/$1\\$2/g;
    $string=~s/\$\$/\$\\\$/g;
    $string=~s/\#\#/\#\\\#/g;
           $string=~s/([^\\]|^)(\~|\^)/$1\\$2\\strut /g;
    $string=~s/(>|<)/\\ensuremath\{$1\}/g; #more or less
    $string=&Apache::lonprintout::character_chart($string);
    # any & or # leftover should be safe to just escape
           $string=~s/([^\\]|^)\&/$1\\\&/g;
           $string=~s/([^\\]|^)\#/$1\\\#/g;
   #single { or } How to escape?
       }
       return $string;
   }
   
   sub inner_xmlparse {
     my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target)=@_;
     my $finaloutput = '';
     my $result;
     my $token;
     my $dontpop=0;
     while ( $#$pars > -1 ) {
       while ($token = $$pars['-1']->get_token) {
         if (($token->[0] eq 'T') || ($token->[0] eq 'C') ) {
    if ($metamode<1) {
       my $text=$token->[1];
       if ($token->[0] eq 'C' && $target eq 'tex') {
    $text = '';
   # $text = '%'.$text."\n";
       }
       $result.=$text;
    }
         } elsif (($token->[0] eq 'D')) {
    if ($metamode<1 && $target eq 'web') {
       my $text=$token->[1];
       $result.=$text;
    }
         } elsif ($token->[0] eq 'PI') {
    if ($metamode<1 && $target eq 'web') {
     $result=$token->[2];
    }
         } elsif ($token->[0] eq 'S') {
    # add tag to stack
    push (@$stack,$token->[1]);
    # add parameters list to another stack
    push (@$parstack,&parstring($token));
    &increasedepth($token);
    if ($Apache::lonxml::usestyle &&
       exists($$style_for_target{$token->[1]})) {
       $Apache::lonxml::usestyle=0;
       my $string=$$style_for_target{$token->[1]}.
         '<LONCAPA_INTERNAL_TURN_STYLE_ON />';
       &Apache::lonxml::newparser($pars,\$string);
       $Apache::lonxml::style_values=$$parstack[-1];
       $Apache::lonxml::style_end_values=$$parstack[-1];
    } else {
     $result = &callsub("start_$token->[1]", $target, $token, $stack,
        $parstack, $pars, $safeeval, $style_for_target);
    }
         } elsif ($token->[0] eq 'E') {
    if ($Apache::lonxml::usestyle &&
       exists($$style_for_target{'/'."$token->[1]"})) {
       $Apache::lonxml::usestyle=0;
       my $string=$$style_for_target{'/'.$token->[1]}.
         '<LONCAPA_INTERNAL_TURN_STYLE_ON end="'.$token->[1].'" />';
       &Apache::lonxml::newparser($pars,\$string);
       $Apache::lonxml::style_values=$Apache::lonxml::style_end_values;
       $Apache::lonxml::style_end_values='';
       $dontpop=1;
    } else {
       #clear out any tags that didn't end
       while ($token->[1] ne $$stack['-1'] && ($#$stack > -1)) {
    my $lasttag=$$stack[-1];
    if ($token->[1] =~ /^\Q$lasttag\E$/i) {
       &Apache::lonxml::warning('Using tag &lt;/'.$token->[1].'&gt; on line '.$token->[3].' as end tag to &lt;'.$$stack[-1].'&gt;');
       last;
    } else {
       &Apache::lonxml::warning('Found tag &lt;/'.$token->[1].'&gt; on line '.$token->[3].' when looking for &lt;/'.$$stack[-1].'&gt; in file');
       &end_tag($stack,$parstack,$token);
    }
       }
       $result = &callsub("end_$token->[1]", $target, $token, $stack,
          $parstack, $pars,$safeeval, $style_for_target);
    }
         } else {
    &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
         }
         #evaluate variable refs in result
         if ($Apache::lonxml::post_evaluate &&$result ne "") {
     my $extras;
     if (!$Apache::lonxml::usestyle) {
         $extras=$Apache::lonxml::style_values;
     }
    if ( $#$parstack > -1 ) {
     $result=&Apache::run::evaluate($result,$safeeval,$extras.$$parstack[-1]);
    } else {
     $result= &Apache::run::evaluate($result,$safeeval,$extras);
    }
         }
         $Apache::lonxml::post_evaluate=1;
   
         if (($token->[0] eq 'T') || ($token->[0] eq 'C') || ($token->[0] eq 'D') ) {
     #Style file definitions should be correct
     if ($target eq 'tex' && ($Apache::lonxml::usestyle)) {
         $result=&latex_special_symbols($result);
     }
         }
   
         if ($Apache::lonxml::redirection) {
    $Apache::lonxml::outputstack['-1'] .= $result;
         } else {
    $finaloutput.=$result;
         }
         $result = '';
   
         if ($token->[0] eq 'E' && !$dontpop) {
    &end_tag($stack,$parstack,$token);
         }
         $dontpop=0;
       }
       if ($#$pars > -1) {
    pop @$pars;
    pop @Apache::lonxml::pwd;
       }
     }
   
     # if ($target eq 'meta') {
     #   $finaloutput.=&endredirection;
     # }
   
   
     if (($ENV{'QUERY_STRING'}) && ($target eq 'web')) {
       $finaloutput=&afterburn($finaloutput);
     }    
     return $finaloutput;
   }
   
   ## 
   ## Looks to see if there is a subroutine defined for this tag.  If so, call it,
   ## otherwise do not call it as we do not know what it is.
   ##
 sub callsub {  sub callsub {
   my ($sub,$target,$token,$parstack,$parser,$safeeval,$style)=@_;    my ($sub,$target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $currentstring='';    my $currentstring='';
     my $nodefault;
   {    {
       my $sub1;
     no strict 'refs';      no strict 'refs';
     if (my $space=$Apache::lonxml::alltags{$token->[1]}) {      my $tag=$token->[1];
       #print "Calling sub $sub in $space \n";  # get utterly rid of extended html tags
       $sub="$space\:\:$sub";      if ($tag=~/^x\-/i) { return ''; }
       $currentstring = &$sub($target,$token,\@$parstack,$parser,$safeeval,$style);      my $space=$Apache::lonxml::alltags{$tag}[-1];
     } else {      if (!$space) {
       #print "NOT Calling sub $sub\n";        $tag=~tr/A-Z/a-z/;
       if (defined($token->[4])) {   $sub=~tr/A-Z/a-z/;
  $currentstring = $token->[4];   $space=$Apache::lonxml::alltags{$tag}[-1]
       }
   
       my $deleted=0;
       $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
       if (($token->[0] eq 'S') && ($target eq 'modified')) {
         $deleted=&Apache::edit::handle_delete($space,$target,$token,$tagstack,
        $parstack,$parser,$safeeval,
        $style);
       }
       if (!$deleted) {
         if ($space) {
    #&Apache::lonxml::debug("Calling sub $sub in $space $metamode");
    $sub1="$space\:\:$sub";
    ($currentstring,$nodefault) = &$sub1($target,$token,$tagstack,
        $parstack,$parser,$safeeval,
        $style);
       } else {        } else {
  $currentstring = $token->[2];            if ($target eq 'tex') {
                 # throw away tag name
                 return '';
             }
    #&Apache::lonxml::debug("NOT Calling sub $sub in $space $metamode");
    if ($metamode <1) {
     if (defined($token->[4]) && ($metamode < 1)) {
       $currentstring = $token->[4];
     } else {
       $currentstring = $token->[2];
     }
    }
         }
         #    &Apache::lonxml::debug("nodefalt:$nodefault:");
         if ($currentstring eq '' && $nodefault eq '') {
    if ($target eq 'edit') {
     #&Apache::lonxml::debug("doing default edit for $token->[1]");
     if ($token->[0] eq 'S') {
       $currentstring = &Apache::edit::tag_start($target,$token);
     } elsif ($token->[0] eq 'E') {
       $currentstring = &Apache::edit::tag_end($target,$token);
     }
    } elsif ($target eq 'modified') {
     if ($token->[0] eq 'S') {
       $currentstring = $token->[4];
       $currentstring.=&Apache::edit::handle_insert();
     } elsif ($token->[0] eq 'E') {
       $currentstring = $token->[2];
               $currentstring.=&Apache::edit::handle_insertafter($token->[1]);
     } else {
       $currentstring = $token->[2];
     }
    }
       }        }
     }      }
     use strict 'refs';      use strict 'refs';
Line 178  sub callsub { Line 600  sub callsub {
   return $currentstring;    return $currentstring;
 }  }
   
   sub setup_globals {
     my ($request,$target)=@_;
     $Apache::lonxml::request=$request;
     $Apache::lonxml::registered = 0;
     $errorcount=0;
     $warningcount=0;
     $Apache::lonxml::default_homework_loaded=0;
     $Apache::lonxml::usestyle=1;
     &init_counter();
     @Apache::lonxml::pwd=();
     @Apache::lonxml::extlinks=();
     @Apache::lonxml::ssi_info=();
     $Apache::lonxml::post_evaluate=1;
     $Apache::lonxml::warnings_error_header='';
     if ($target eq 'meta') {
       $Apache::lonxml::redirection = 0;
       $Apache::lonxml::metamode = 1;
       $Apache::lonxml::evaluate = 1;
       $Apache::lonxml::import = 0;
     } elsif ($target eq 'answer') {
       $Apache::lonxml::redirection = 0;
       $Apache::lonxml::metamode = 1;
       $Apache::lonxml::evaluate = 1;
       $Apache::lonxml::import = 1;
     } elsif ($target eq 'grade') {
       &startredirection;
       $Apache::lonxml::metamode = 0;
       $Apache::lonxml::evaluate = 1;
       $Apache::lonxml::import = 1;
     } elsif ($target eq 'modified') {
       $Apache::lonxml::redirection = 0;
       $Apache::lonxml::metamode = 0;
       $Apache::lonxml::evaluate = 0;
       $Apache::lonxml::import = 0;
     } elsif ($target eq 'edit') {
       $Apache::lonxml::redirection = 0;
       $Apache::lonxml::metamode = 0;
       $Apache::lonxml::evaluate = 0;
       $Apache::lonxml::import = 0;
     } elsif ($target eq 'analyze') {
       $Apache::lonxml::redirection = 0;
       $Apache::lonxml::metamode = 0;
       $Apache::lonxml::evaluate = 1;
       $Apache::lonxml::import = 1;
     } else {
       $Apache::lonxml::redirection = 0;
       $Apache::lonxml::metamode = 0;
       $Apache::lonxml::evaluate = 1;
       $Apache::lonxml::import = 1;
     }
   }
   
   sub init_safespace {
     my ($target,$safeeval,$safehole,$safeinit) = @_;
     $safeeval->permit("entereval");
     $safeeval->permit(":base_math");
     $safeeval->permit("sort");
     $safeeval->permit("time");
     $safeeval->deny(":base_io");
     $safehole->wrap(\&Apache::scripttag::xmlparse,$safeeval,'&xmlparse');
     $safehole->wrap(\&Apache::outputtags::multipart,$safeeval,'&multipart');
     $safehole->wrap(\&Apache::lonnet::EXT,$safeeval,'&EXT');
     
     $safehole->wrap(\&Math::Cephes::asin,$safeeval,'&asin');
     $safehole->wrap(\&Math::Cephes::acos,$safeeval,'&acos');
     $safehole->wrap(\&Math::Cephes::atan,$safeeval,'&atan');
     $safehole->wrap(\&Math::Cephes::sinh,$safeeval,'&sinh');
     $safehole->wrap(\&Math::Cephes::cosh,$safeeval,'&cosh');
     $safehole->wrap(\&Math::Cephes::tanh,$safeeval,'&tanh');
     $safehole->wrap(\&Math::Cephes::asinh,$safeeval,'&asinh');
     $safehole->wrap(\&Math::Cephes::acosh,$safeeval,'&acosh');
     $safehole->wrap(\&Math::Cephes::atanh,$safeeval,'&atanh');
     $safehole->wrap(\&Math::Cephes::erf,$safeeval,'&erf');
     $safehole->wrap(\&Math::Cephes::erfc,$safeeval,'&erfc');
     $safehole->wrap(\&Math::Cephes::j0,$safeeval,'&j0');
     $safehole->wrap(\&Math::Cephes::j1,$safeeval,'&j1');
     $safehole->wrap(\&Math::Cephes::jn,$safeeval,'&jn');
     $safehole->wrap(\&Math::Cephes::jv,$safeeval,'&jv');
     $safehole->wrap(\&Math::Cephes::y0,$safeeval,'&y0');
     $safehole->wrap(\&Math::Cephes::y1,$safeeval,'&y1');
     $safehole->wrap(\&Math::Cephes::yn,$safeeval,'&yn');
     $safehole->wrap(\&Math::Cephes::yv,$safeeval,'&yv');
     
     $safehole->wrap(\&Math::Cephes::bdtr  ,$safeeval,'&bdtr'  );
     $safehole->wrap(\&Math::Cephes::bdtrc ,$safeeval,'&bdtrc' );
     $safehole->wrap(\&Math::Cephes::bdtri ,$safeeval,'&bdtri' );
     $safehole->wrap(\&Math::Cephes::btdtr ,$safeeval,'&btdtr' );
     $safehole->wrap(\&Math::Cephes::chdtr ,$safeeval,'&chdtr' );
     $safehole->wrap(\&Math::Cephes::chdtrc,$safeeval,'&chdtrc');
     $safehole->wrap(\&Math::Cephes::chdtri,$safeeval,'&chdtri');
     $safehole->wrap(\&Math::Cephes::fdtr  ,$safeeval,'&fdtr'  );
     $safehole->wrap(\&Math::Cephes::fdtrc ,$safeeval,'&fdtrc' );
     $safehole->wrap(\&Math::Cephes::fdtri ,$safeeval,'&fdtri' );
     $safehole->wrap(\&Math::Cephes::gdtr  ,$safeeval,'&gdtr'  );
     $safehole->wrap(\&Math::Cephes::gdtrc ,$safeeval,'&gdtrc' );
     $safehole->wrap(\&Math::Cephes::nbdtr ,$safeeval,'&nbdtr' );
     $safehole->wrap(\&Math::Cephes::nbdtrc,$safeeval,'&nbdtrc');
     $safehole->wrap(\&Math::Cephes::nbdtri,$safeeval,'&nbdtri');
     $safehole->wrap(\&Math::Cephes::ndtr  ,$safeeval,'&ndtr'  );
     $safehole->wrap(\&Math::Cephes::ndtri ,$safeeval,'&ndtri' );
     $safehole->wrap(\&Math::Cephes::pdtr  ,$safeeval,'&pdtr'  );
     $safehole->wrap(\&Math::Cephes::pdtrc ,$safeeval,'&pdtrc' );
     $safehole->wrap(\&Math::Cephes::pdtri ,$safeeval,'&pdtri' );
     $safehole->wrap(\&Math::Cephes::stdtr ,$safeeval,'&stdtr' );
     $safehole->wrap(\&Math::Cephes::stdtri,$safeeval,'&stdtri');
   
   #  $safehole->wrap(\&Math::Cephes::new_fract,$safeeval,'&new_fract');
   #  $safehole->wrap(\&Math::Cephes::radd,$safeeval,'&radd');
   #  $safehole->wrap(\&Math::Cephes::rsub,$safeeval,'&rsub');
   #  $safehole->wrap(\&Math::Cephes::rmul,$safeeval,'&rmul');
   #  $safehole->wrap(\&Math::Cephes::rdiv,$safeeval,'&rdiv');
   #  $safehole->wrap(\&Math::Cephes::euclid,$safeeval,'&euclid');
   
     $safehole->wrap(\&Math::Random::random_beta,$safeeval,'&math_random_beta');
     $safehole->wrap(\&Math::Random::random_chi_square,$safeeval,'&math_random_chi_square');
     $safehole->wrap(\&Math::Random::random_exponential,$safeeval,'&math_random_exponential');
     $safehole->wrap(\&Math::Random::random_f,$safeeval,'&math_random_f');
     $safehole->wrap(\&Math::Random::random_gamma,$safeeval,'&math_random_gamma');
     $safehole->wrap(\&Math::Random::random_multivariate_normal,$safeeval,'&math_random_multivariate_normal');
     $safehole->wrap(\&Math::Random::random_multinomial,$safeeval,'&math_random_multinomial');
     $safehole->wrap(\&Math::Random::random_noncentral_chi_square,$safeeval,'&math_random_noncentral_chi_square');
     $safehole->wrap(\&Math::Random::random_noncentral_f,$safeeval,'&math_random_noncentral_f');
     $safehole->wrap(\&Math::Random::random_normal,$safeeval,'&math_random_normal');
     $safehole->wrap(\&Math::Random::random_permutation,$safeeval,'&math_random_permutation');
     $safehole->wrap(\&Math::Random::random_permuted_index,$safeeval,'&math_random_permuted_index');
     $safehole->wrap(\&Math::Random::random_uniform,$safeeval,'&math_random_uniform');
     $safehole->wrap(\&Math::Random::random_poisson,$safeeval,'&math_random_poisson');
     $safehole->wrap(\&Math::Random::random_uniform_integer,$safeeval,'&math_random_uniform_integer');
     $safehole->wrap(\&Math::Random::random_negative_binomial,$safeeval,'&math_random_negative_binomial');
     $safehole->wrap(\&Math::Random::random_binomial,$safeeval,'&math_random_binomial');
     $safehole->wrap(\&Math::Random::random_seed_from_phrase,$safeeval,'&random_seed_from_phrase');
     $safehole->wrap(\&Math::Random::random_set_seed_from_phrase,$safeeval,'&random_set_seed_from_phrase');
     $safehole->wrap(\&Math::Random::random_get_seed,$safeeval,'&random_get_seed');
     $safehole->wrap(\&Math::Random::random_set_seed,$safeeval,'&random_set_seed');
     $safehole->wrap(\&Apache::lonxml::error,$safeeval,'&LONCAPA_INTERNAL_ERROR');
     $safehole->wrap(\&Apache::lonxml::debug,$safeeval,'&LONCAPA_INTERNAL_DEBUG');
   
   #need to inspect this class of ops
   # $safeeval->deny(":base_orig");
     $safeinit .= ';$external::target="'.$target.'";';
     my $rndseed;
     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
     $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name);
     $safeinit .= ';$external::randomseed="'.$rndseed.'";';
     &Apache::lonxml::debug("Setting rndseed to $rndseed");
     &Apache::run::run($safeinit,$safeeval);
   
     my $subroutine=<<'EVALUATESUB';
   sub __LC_INTERNAL_EVALUATE__ {
       my ($__LC__a,$__LC__b,$__LC__c)=@_;
       my $__LC__prefix;
       while(1){
    { 
       use strict;
       no strict "vars";
       if (eval(defined(eval($__LC__a.$__LC__b)))) {
    return $__LC__prefix.eval($__LC__a.$__LC__b.$__LC__c);
       }
    }
    $__LC__prefix.=substr($__LC__a,0,1,"");
    if ($__LC__a!~/^(\$|&|\#)/) { last; }
       }
       return $__LC__prefix.$__LC__a.$__LC__b.$__LC__c;
   }
   EVALUATESUB
       $safeeval->permit("require");
       $safeeval->reval($subroutine);
       $safeeval->deny("require");
   }
   
   sub default_homework_load {
       my ($safeeval)=@_;
       &Apache::lonxml::debug('Loading default_homework');
       my $default=&Apache::lonnet::getfile('/home/httpd/html/res/adm/includes/default_homework.lcpm');
       if ($default eq -1) {
    &Apache::lonxml::error("<b>Unable to find <i>default_homework.lcpm</i></b>");
       } else {
    &Apache::run::run($default,$safeeval);
    $Apache::lonxml::default_homework_loaded=1;
       }
   }
   
   sub startredirection {
     $Apache::lonxml::redirection++;
     push (@Apache::lonxml::outputstack, '');
   }
   
   sub endredirection {
     if (!$Apache::lonxml::redirection) {
       &Apache::lonxml::error("Endredirection was called, before a startredirection, perhaps you have unbalanced tags. Some debuging information:".join ":",caller);
       return '';
     }
     $Apache::lonxml::redirection--;
     pop @Apache::lonxml::outputstack;
   }
   
   sub end_tag {
     my ($tagstack,$parstack,$token)=@_;
     pop(@$tagstack);
     pop(@$parstack);
     &decreasedepth($token);
   }
   
   sub initdepth {
     @Apache::lonxml::depthcounter=();
     $Apache::lonxml::depth=-1;
     $Apache::lonxml::olddepth=-1;
   }
   
   sub increasedepth {
     my ($token) = @_;
     $Apache::lonxml::depth++;
     $Apache::lonxml::depthcounter[$Apache::lonxml::depth]++;
     if ($Apache::lonxml::depthcounter[$Apache::lonxml::depth]==1) {
       $Apache::lonxml::olddepth=$Apache::lonxml::depth;
     }
     my $curdepth=join('_',@Apache::lonxml::depthcounter);
     &Apache::lonxml::debug("s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n");
   #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
   }
   
   sub decreasedepth {
     my ($token) = @_;
     $Apache::lonxml::depth--;
     if ($Apache::lonxml::depth<$Apache::lonxml::olddepth-1) {
       $#Apache::lonxml::depthcounter--;
       $Apache::lonxml::olddepth=$Apache::lonxml::depth+1;
     }
     if (  $Apache::lonxml::depth < -1) {
       &Apache::lonxml::warning(&mt("Missing tags, unable to properly run file."));
       $Apache::lonxml::depth='-1';
     }
     my $curdepth=join('_',@Apache::lonxml::depthcounter);
     &Apache::lonxml::debug("e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n");
   #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
   }
   
   sub get_all_text_unbalanced {
   #there is a copy of this in lonpublisher.pm
    my($tag,$pars)= @_;
    my $token;
    my $result='';
    $tag='<'.$tag.'>';
    while ($token = $$pars[-1]->get_token) {
      if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
        $result.=$token->[1];
      } elsif ($token->[0] eq 'PI') {
        $result.=$token->[2];
      } elsif ($token->[0] eq 'S') {
        $result.=$token->[4];
      } elsif ($token->[0] eq 'E')  {
        $result.=$token->[2];
      }
      if ($result =~ /(.*)\Q$tag\E(.*)/is) {
        &Apache::lonxml::debug('Got a winner with leftovers ::'.$2);
        &Apache::lonxml::debug('Result is :'.$1);
        $result=$1;
        my $redo=$tag.$2;
        &Apache::lonxml::newparser($pars,\$redo);
        last;
      }
    }
    return $result
   }
   
   sub increment_counter {
       my ($increment) = @_;
       if (defined($increment) && $increment gt 0) {
    $Apache::lonxml::counter+=$increment;
       } else {
    $Apache::lonxml::counter++;
       }
       $Apache::lonxml::counter_changed=1;
   }
   
   sub init_counter {
       if (defined($ENV{'form.counter'})) {
    $Apache::lonxml::counter=$ENV{'form.counter'};
    $Apache::lonxml::counter_changed=0;
       } else {
    $Apache::lonxml::counter=1;
    $Apache::lonxml::counter_changed=1;
       }
   }
   
   sub store_counter {
       &Apache::lonnet::appenv(('form.counter' => $Apache::lonxml::counter));
       return '';
   }
   
   sub get_all_text {
       my($tag,$pars,$style)= @_;
       my $gotfullstack=1;
       if (ref($pars) ne 'ARRAY') {
    $gotfullstack=0;
    $pars=[$pars];
       }
       if (ref($style) ne 'HASH') {
    $style={};
       }
       my $depth=0;
       my $token;
       my $result='';
       if ( $tag =~ m:^/: ) { 
    my $tag=substr($tag,1); 
    #&Apache::lonxml::debug("have:$tag:");
    my $top_empty=0;
    while (($depth >=0) && ($#$pars > -1) && (!$top_empty)) {
       while (($depth >=0) && ($token = $$pars[-1]->get_token)) {
    #&Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]:".$#$pars.":".$#Apache::lonxml::pwd);
    if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
       $result.=$token->[1];
    } elsif ($token->[0] eq 'PI') {
       $result.=$token->[2];
    } elsif ($token->[0] eq 'S') {
       if ($token->[1] =~ /^\Q$tag\E$/i) { $depth++; }
       if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_ON$/) { $Apache::lonxml::usestyle=1; }
       if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_OFF$/) { $Apache::lonxml::usestyle=0; }
       $result.=$token->[4];
    } elsif ($token->[0] eq 'E')  {
       if ( $token->[1] =~ /^\Q$tag\E$/i) { $depth--; }
       #skip sending back the last end tag
       if ($depth == 0 && exists($$style{'/'.$token->[1]}) && $Apache::lonxml::usestyle) {
    my $string=
       '<LONCAPA_INTERNAL_TURN_STYLE_OFF end="yes" />'.
    $$style{'/'.$token->[1]}.
       $token->[2].
    '<LONCAPA_INTERNAL_TURN_STYLE_ON />';
    &Apache::lonxml::newparser($pars,\$string);
    #&Apache::lonxml::debug("reParsing $string");
    next;
       }
       if ($depth > -1) {
    $result.=$token->[2];
       } else {
    $$pars[-1]->unget_token($token);
       }
    }
       }
       if (($depth >=0) && ($#$pars == 0) ) { $top_empty=1; }
       if (($depth >=0) && ($#$pars > 0) ) {
    pop(@$pars);
    pop(@Apache::lonxml::pwd);
       }
    }
    if ($top_empty && $depth >= 0) {
       #never found the end tag ran out of text, throw error send back blank
       &error('Never found end tag for &lt;'.$tag.
      '&gt; current string <pre>'.
      &HTML::Entities::encode($result,'<>&"').
      '</pre>');
       if ($gotfullstack) {
    my $newstring='</'.$tag.'>'.$result;
    &Apache::lonxml::newparser($pars,\$newstring);
       }
       $result='';
    }
       } else {
    while ($#$pars > -1) {
       while ($token = $$pars[-1]->get_token) {
    #&Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
    if (($token->[0] eq 'T')||($token->[0] eq 'C')||
       ($token->[0] eq 'D')) {
       $result.=$token->[1];
    } elsif ($token->[0] eq 'PI') {
       $result.=$token->[2];
    } elsif ($token->[0] eq 'S') {
       if ( $token->[1] =~ /^\Q$tag\E$/i) {
    $$pars[-1]->unget_token($token); last;
       } else {
    $result.=$token->[4];
       }
       if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_ON$/) { $Apache::lonxml::usestyle=1; }
       if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_OFF$/) { $Apache::lonxml::usestyle=0; }
    } elsif ($token->[0] eq 'E')  {
       $result.=$token->[2];
    }
       }
       if (($#$pars > 0) ) {
    pop(@$pars);
    pop(@Apache::lonxml::pwd);
       } else { last; }
    }
       }
       #&Apache::lonxml::debug("Exit:$result:");
       return $result
   }
   
   sub newparser {
     my ($parser,$contentref,$dir) = @_;
     push (@$parser,HTML::LCParser->new($contentref));
     $$parser['-1']->xml_mode('1');
     if ( $dir eq '' ) {
       push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
     } else {
       push (@Apache::lonxml::pwd, $dir);
     } 
   }
   
 sub parstring {  sub parstring {
   my ($token) = @_;    my ($token) = @_;
   my $temp='';    my $temp='';
   map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};    foreach (@{$token->[3]}) {
       unless ($_=~/\W/) {
         my $val=$token->[2]->{$_};
         $val =~ s/([\%\@\\\"\'])/\\$1/g;
         #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
         $temp .= "my \$$_=\"$val\";";
       }
     }
   return $temp;    return $temp;
 }  }
 1;  
 __END__  
   
   sub writeallows {
       unless ($#extlinks>=0) { return; }
       my $thisurl='/res/'.&Apache::lonnet::declutter(shift);
       if ($ENV{'httpref.'.$thisurl}) {
    $thisurl=$ENV{'httpref.'.$thisurl};
       }
       my $thisdir=$thisurl;
       $thisdir=~s/\/[^\/]+$//;
       my %httpref=();
       foreach (@extlinks) {
          $httpref{'httpref.'.
            &Apache::lonnet::hreflocation($thisdir,$_)}=$thisurl;
       }
       @extlinks=();
       &Apache::lonnet::appenv(%httpref);
   }
   
   sub register_ssi {
       my ($url,%form)=@_;
       push (@Apache::lonxml::ssi_info,{'url'=>$url,'form'=>\%form});
       return '';
   }
   
   sub do_registered_ssi {
       foreach my $info (@Apache::lonxml::ssi_info) {
    my %form=%{ $info->{'form'}};
    my $url=$info->{'url'};
    &Apache::lonnet::ssi($url,%form);
       }
   }
   #
   # Afterburner handles anchors, highlights and links
   #
   sub afterburn {
       my $result=shift;
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['highlight','anchor','link']);
       if ($ENV{'form.highlight'}) {
          foreach (split(/\,/,$ENV{'form.highlight'})) {
              my $anchorname=$_;
      my $matchthis=$anchorname;
              $matchthis=~s/\_+/\\s\+/g;
              $result=~s/(\Q$matchthis\E)/\<font color=\"red\"\>$1\<\/font\>/gs;
          }
       }
       if ($ENV{'form.link'}) {
          foreach (split(/\,/,$ENV{'form.link'})) {
              my ($anchorname,$linkurl)=split(/\>/,$_);
      my $matchthis=$anchorname;
              $matchthis=~s/\_+/\\s\+/g;
              $result=~s/(\Q$matchthis\E)/\<a href=\"$linkurl\"\>$1\<\/a\>/gs;
          }
       }
       if ($ENV{'form.anchor'}) {
           my $anchorname=$ENV{'form.anchor'};
    my $matchthis=$anchorname;
           $matchthis=~s/\_+/\\s\+/g;
           $result=~s/(\Q$matchthis\E)/\<a name=\"$anchorname\"\>$1\<\/a\>/s;
           $result.=(<<"ENDSCRIPT");
   <script type="text/javascript">
       document.location.hash='$anchorname';
   </script>
   ENDSCRIPT
       }
       return $result;
   }
   
   sub storefile {
       my ($file,$contents)=@_;
       &Apache::lonnet::correct_line_ends(\$contents);
       if (my $fh=Apache::File->new('>'.$file)) {
    print $fh $contents;
           $fh->close();
           return 1;
       } else {
    &warning("Unable to save file $file");
    return 0;
       }
   }
   
   sub createnewhtml {
     my $filecontents=(<<SIMPLECONTENT);
   <html>
   <head>
   <title>
                              Title of Document Goes Here
   </title>
   </head>
   <body bgcolor="#FFFFFF">
   
                              Body of Document Goes Here
   
   </body>
   </html>
   SIMPLECONTENT
     return $filecontents;
   }
   
   sub createnewsty {
     my $filecontents=(<<SIMPLECONTENT);
   <definetag name="">
       <render>
          <web></web>
          <tex></tex>
       </render>
   </definetag>
   SIMPLECONTENT
     return $filecontents;
   }
   
   
   sub inserteditinfo {
         my ($result,$filecontents,$filetype)=@_;
         $filecontents = &HTML::Entities::encode($filecontents,'<>&"');
   #      my $editheader='<a href="#editsection">Edit below</a><hr />';
         my $xml_help = '';
         if ($filetype eq 'html') {
     $xml_help=Apache::loncommon::helpLatexCheatsheet();
         }
         my $cleanbut = '';
         if ($filetype eq 'html') {
     $cleanbut='<input type="submit" name="attemptclean" value="'.
         &mt('Save and then attempt to clean HTML').'" />';
         }
         my $titledisplay=&display_title();
         my %lt=&Apache::lonlocal::texthash('st' => 'Save this',
    'vi' => 'View',
    'ed' => 'Edit');
         my $buttons=(<<BUTTONS);
   $cleanbut
   <input type="submit" name="savethisfile" accesskey="s"  value="$lt{'st'}" />
   <input type="submit" name="viewmode" accesskey="v" value="$lt{'vi'}" />
   BUTTONS
         my $editfooter=(<<ENDFOOTER);
   <hr />
   <a name="editsection" />
   <form method="post">
   $xml_help
   <input type="hidden" name="editmode" value="$lt{'ed'}" />
   $buttons<br />
   <textarea cols="80" rows="40" name="filecont">$filecontents</textarea>
   <br />$buttons
   <br />
   </form>
   $titledisplay
   ENDFOOTER
   #      $result=~s/(\<body[^\>]*\>)/$1$editheader/is;
         $result=~s/(\<\/body\>)/$editfooter/is;
         return $result;
   }
   
   sub get_target {
     my $viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
     if ( $ENV{'request.state'} eq 'published') {
       if ( defined($ENV{'form.grade_target'})
    && ($viewgrades == 'F' )) {
         return ($ENV{'form.grade_target'});
       } elsif (defined($ENV{'form.grade_target'})) {
         if (($ENV{'form.grade_target'} eq 'web') ||
     ($ENV{'form.grade_target'} eq 'tex') ) {
    return $ENV{'form.grade_target'}
         } else {
    return 'web';
         }
       } else {
         return 'web';
       }
     } elsif ($ENV{'request.state'} eq 'construct') {
       if ( defined($ENV{'form.grade_target'})) {
         return ($ENV{'form.grade_target'});
       } else {
         return 'web';
       }
     } else {
       return 'web';
     }
   }
   
   sub handler {
       my $request=shift;
       
       my $target=&get_target();
       
       $Apache::lonxml::debug=$ENV{'user.debug'};
       
       if ($ENV{'browser.mathml'}) {
    &Apache::loncommon::content_type($request,'text/xml');
       } else {
    &Apache::loncommon::content_type($request,'text/html');
       }
       &Apache::loncommon::no_cache($request);
       $request->send_http_header;
       
       return OK if $request->header_only;
   
   
       my $file=&Apache::lonnet::filelocation("",$request->uri);
       my $filetype;
       if ($file =~ /\.sty$/) {
    $filetype='sty';
       } else {
    $filetype='html';
       }
   #
   # Edit action? Save file.
   #
       unless ($ENV{'request.state'} eq 'published') {
    if (($ENV{'form.savethisfile'}) || ($ENV{'form.attemptclean'})) {
       if (&storefile($file,$ENV{'form.filecont'})) {
    &Apache::lonxml::info("<font COLOR=\"#0000FF\">".
         &mt('Updated').": ".
         &Apache::lonlocal::locallocaltime(time).
         " </font>");
       } 
    }
       }
       my %mystyle;
       my $result = '';
       my $filecontents=&Apache::lonnet::getfile($file);
       if ($filecontents eq -1) {
    my $bodytag=&Apache::loncommon::bodytag('File Error');
    my $fnf=&mt('File not found');
    $result=(<<ENDNOTFOUND);
   <html>
   <head>
   <title>$fnf</title>
   </head>
   $bodytag
   <b>$fnf: $file</b>
   </body>
   </html>
   ENDNOTFOUND
       $filecontents='';
    if ($ENV{'request.state'} ne 'published') {
       if ($filetype eq 'sty') {
    $filecontents=&createnewsty();
       } else {
    $filecontents=&createnewhtml();
       }
       $ENV{'form.editmode'}='Edit'; #force edit mode
    }
       } else {
    unless ($ENV{'request.state'} eq 'published') {
       if ($ENV{'form.attemptclean'}) {
    $filecontents=&htmlclean($filecontents,1);
       }
   #
   # we are in construction space, see if edit mode forced
               &Apache::loncommon::get_unprocessed_cgi
                             ($ENV{'QUERY_STRING'},['editmode']);
    }
    if (!$ENV{'form.editmode'} || $ENV{'form.viewmode'}) {
       $result = &Apache::lonxml::xmlparse($request,$target,$filecontents,
    '',%mystyle);
    }
       }
       
   #
   # Edit action? Insert editing commands
   #
       unless ($ENV{'request.state'} eq 'published') {
    if ($ENV{'form.editmode'} && (!($ENV{'form.viewmode'}))) {
       my $displayfile=$request->uri;
       $displayfile=~s/^\/[^\/]*//;
       $result='<html><body bgcolor="#FFFFFF">'.
    &Apache::lonxml::message_location().'<h3>'.
    $displayfile.
    '</h3></body></html>';
       $result=&inserteditinfo($result,$filecontents,$filetype);
    }
       }
       if ($filetype eq 'html') { writeallows($request->uri); }
   
       
       &Apache::lonxml::add_messages(\$result);
       $request->print($result);
       
       return OK;
   }
   
   sub display_title {
       my $result;
       if ($ENV{'request.state'} eq 'construct') {
    my $title=&Apache::lonnet::gettitle();
    if (!defined($title) || $title eq '') {
       $title = $ENV{'request.filename'};
       $title = substr($title, rindex($title, '/') + 1);
    }
    $result = "<script type='text/javascript'>top.document.title = '$title - LON-CAPA Construction Space';</script>";
       }
       return $result;
   }
   
   sub debug {
       if ($Apache::lonxml::debug eq "1") {
    $|=1;
    my $request=$Apache::lonxml::request;
    if (!$request) { $request=Apache->request; }
    $request->print('<font size="-2"><pre>DEBUG:'.&HTML::Entities::encode($_[0],'<>&"')."</pre></font>\n");
       }
   }
   
   sub error {
     $errorcount++;
     my $request=$Apache::lonxml::request;
     if (!$request) { $request=Apache->request; }
     if (($Apache::lonxml::debug eq 1) || ($ENV{'request.state'} eq 'construct') ) {
       # If printing in construction space, put the error inside <pre></pre>
         push(@Apache::lonxml::error_messages,
      $Apache::lonxml::warnings_error_header.
      "<b>ERROR:</b>".join("<br />\n",@_)."<br />\n");
         $Apache::lonxml::warnings_error_header='';
     } else {
         push(@Apache::lonxml::error_messages,
      "<b>An Error occured while processing this resource. The instructor has been notified.</b> <br />");
       #notify author
       &Apache::lonmsg::author_res_msg($ENV{'request.filename'},join('<br />',@_));
       #notify course
       if ( $ENV{'request.course.id'} ) {
         my (undef,%users)=&Apache::lonfeedback::decide_receiver(undef,0,1,1,1);
         my $declutter=&Apache::lonnet::declutter($ENV{'request.filename'});
         foreach (keys %users) {
    my ($user,$domain) = split(/:/, $_);
    &Apache::lonmsg::user_normal_msg($user,$domain,
           "Error [$declutter]",join('<br />',@_));
         }
       }
     }
   }
   
   sub warning {
       $warningcount++;
     
       if ($ENV{'form.grade_target'} ne 'tex') {
    if ($ENV{'request.state'} eq 'construct' || $Apache::lonxml::debug) {
       my $request=$Apache::lonxml::request;
       if (!$request) { $request=Apache->request; }
       push(@Apache::lonxml::warning_messages,
    $Apache::lonxml::warnings_error_header.
    "<b>W</b>ARNING<b>:</b>".join('<br />',@_)."<br />\n");
       $Apache::lonxml::warnings_error_header='';
    }
       }
   }
   
   sub info {
       if ($ENV{'form.grade_target'} ne 'tex' 
    && $ENV{'request.state'} eq 'construct') {
    push(@Apache::lonxml::info_messages,join('<br />',@_)."<br />\n");
       }
   }
   
   sub message_location {
       return '__LONCAPA_INTERNAL_MESSAGE_LOCATION__';
   }
   
   sub add_messages {
       my ($msg)=@_;
       my $result=join(' ',
       @Apache::lonxml::info_messages,
       @Apache::lonxml::error_messages,
       @Apache::lonxml::warning_messages);
       undef(@Apache::lonxml::info_messages);
       undef(@Apache::lonxml::error_messages);
       undef(@Apache::lonxml::warning_messages);
       $$msg=~s/__LONCAPA_INTERNAL_MESSAGE_LOCATION__/$result/;
       $$msg=~s/__LONCAPA_INTERNAL_MESSAGE_LOCATION__//g;
   }
   
   sub get_param {
       my ($param,$parstack,$safeeval,$context,$case_insensitive) = @_;
       if ( ! $context ) { $context = -1; }
       my $args ='';
       if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
       if ( ! $Apache::lonxml::usestyle ) {
    $args=$Apache::lonxml::style_values.$args;
       }
       if ( ! $args ) { return undef; }
       if ( $case_insensitive ) {
    if ($args =~ s/(my \$)(\Q$param\E)(=\")/$1.lc($2).$3/ei) {
       return &Apache::run::run("{$args;".'return $'.$param.'}',
                                        $safeeval); #'
    } else {
       return undef;
    }
       } else {
    if ( $args =~ /my \$\Q$param\E=\"/ ) {
       return &Apache::run::run("{$args;".'return $'.$param.'}',
                                        $safeeval); #'
    } else {
       return undef;
    }
       }
   }
   
   sub get_param_var {
     my ($param,$parstack,$safeeval,$context,$case_insensitive) = @_;
     if ( ! $context ) { $context = -1; }
     my $args ='';
     if ( $#$parstack > (-2-$context) ) { $args=$$parstack[$context]; }
     if ( ! $Apache::lonxml::usestyle ) {
         $args=$Apache::lonxml::style_values.$args;
     }
     &Apache::lonxml::debug("Args are $args param is $param");
     if ($case_insensitive) {
         if (! ($args=~s/(my \$)(\Q$param\E)(=\")/$1.lc($2).$3/ei)) {
     return undef;
         }
     } elsif ( $args !~ /my \$\Q$param\E=\"/ ) { return undef; }
     my $value=&Apache::run::run("{$args;".'return $'.$param.'}',$safeeval); #'
     &Apache::lonxml::debug("first run is $value");
     if ($value =~ /^[\$\@\%]\w+$/) {
         &Apache::lonxml::debug("doing second");
         my @result=&Apache::run::run("return $value",$safeeval,1);
         if (!defined($result[0])) {
     return $value
         } else {
     if (wantarray) { return @result; } else { return $result[0]; }
         }
     } else {
       return $value;
     }
   }
   
   sub register_insert {
     my @data = split /\n/, &Apache::lonnet::getfile('/home/httpd/lonTabs/insertlist.tab');
     my $i;
     my $tagnum=0;
     my @order;
     for ($i=0;$i < $#data; $i++) {
       my $line = $data[$i];
       if ( $line =~ /^\#/ || $line =~ /^\s*\n/) { next; }
       if ( $line =~ /TABLE/ ) { last; }
       my ($tag,$descrip,$color,$function,$show,$helpfile,$helpdesc) = split(/,/, $line);
       if ($tag) {
         $insertlist{"$tagnum.tag"} = $tag;
         $insertlist{"$tagnum.description"} = $descrip;
         $insertlist{"$tagnum.color"} = $color;
         $insertlist{"$tagnum.function"} = $function;
         if (!defined($show)) { $show='yes'; }
         $insertlist{"$tagnum.show"}= $show;
         $insertlist{"$tagnum.helpfile"} = $helpfile;
         $insertlist{"$tagnum.helpdesc"} = $helpdesc;
         $insertlist{"$tag.num"}=$tagnum;
         $tagnum++;
       }
     }
     $i++; #skipping TABLE line
     $tagnum = 0;
     for (;$i < $#data;$i++) {
       my $line = $data[$i];
       my ($mnemonic,@which) = split(/ +/,$line);
       my $tag = $insertlist{"$tagnum.tag"};
       for (my $j=0;$j <=$#which;$j++) {
         if ( $which[$j] eq 'Y' ) {
    if ($insertlist{"$j.show"} ne 'no') {
     push(@{ $insertlist{"$tag.which"} },$j);
    }
         }
       }
       $tagnum++;
     }
   }
   
   sub description {
     my ($token)=@_;
     my $tagnum;
     my $tag=$token->[1];
     foreach my $namespace (reverse @Apache::lonxml::namespace) {
       my $testtag=$namespace.'::'.$tag;
       $tagnum=$insertlist{"$testtag.num"};
       if (defined($tagnum)) { last; }
     }
     if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
     return $insertlist{$tagnum.'.description'};
   }
   
   # Returns a list containing the help file, and the description
   sub helpinfo {
     my ($token)=@_;
     my $tagnum;
     my $tag=$token->[1];
     foreach my $namespace (reverse @Apache::lonxml::namespace) {
       my $testtag=$namespace.'::'.$tag;
       $tagnum=$insertlist{"$testtag.num"};
       if (defined($tagnum)) { last; }
     }
     if (!defined ($tagnum)) { $tagnum=$Apache::lonxml::insertlist{"$tag.num"}; }
     return ($insertlist{$tagnum.'.helpfile'}, $insertlist{$tagnum.'.helpdesc'});
   }
   
   # ----------------------------------------------------------------- whichuser
   # returns a list of $symb, $courseid, $domain, $name that is correct for
   # calls to lonnet functions for this setup.
   # - looks for form.grade_ parameters
   sub whichuser {
     my ($passedsymb)=@_;
     my ($symb,$courseid,$domain,$name,$publicuser);
     if (defined($ENV{'form.grade_symb'})) {
       my $tmp_courseid=$ENV{'form.grade_courseid'};
       my $allowed=&Apache::lonnet::allowed('vgr',$tmp_courseid);
       if ($allowed) {
         $symb=$ENV{'form.grade_symb'};
         $courseid=$ENV{'form.grade_courseid'};
         $domain=$ENV{'form.grade_domain'};
         $name=$ENV{'form.grade_username'};
       }
     } else {
         if (!$passedsymb) {
             $symb=&Apache::lonnet::symbread();
         } else {
             $symb=$passedsymb;
         }
         $courseid=$ENV{'request.course.id'};
         $domain=$ENV{'user.domain'};
         $name=$ENV{'user.name'};
         if ($name eq 'public' && $domain eq 'public') {
     if (!defined($ENV{'form.username'})) {
         $ENV{'form.username'}.=time.rand(10000000);
     }
     $name.=$ENV{'form.username'};
         }
     }
     return ($symb,$courseid,$domain,$name,$publicuser);
   }
   
   1;
   __END__
   
   
Removed from v.1.14  
changed lines
  Added in v.1.319

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