Diff for /loncom/xml/lonxml.pm between versions 1.10 and 1.491

version 1.10, 2000/07/14 19:11:03 version 1.491, 2009/02/18 06:43:55
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;   =pod
   
   =head1 NAME
   
   Apache::lonxml
   
   =head1 SYNOPSIS
   
   XML Parsing Module
   
   This is part of the LearningOnline Network with CAPA project
   described at http://www.lon-capa.org.
   
   
   =head1 SUBROUTINES
   
   =cut
   
   
   
   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 LONCAPA;
 use Safe;  use HTML::LCParser();
   use HTML::TreeBuilder();
   use HTML::Entities();
   use Safe();
   use Safe::Hole();
   use Math::Cephes();
   use Math::Random();
   use Opcode();
   use POSIX qw(strftime);
   use Time::HiRes qw( gettimeofday tv_interval );
   use Symbol();
   
 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}=$space;  
   sub deregister {
     my ($space,@taglist) = @_;
     foreach my $temptag (@taglist) {
       my $tempspace = $Apache::lonxml::alltags{$temptag}[-1];
       if ($tempspace eq $space) {
         pop(@{ $Apache::lonxml::alltags{$temptag} });
       }
   }    }
     #&printalltags();
 }  }
   
 use Apache::style;  use Apache::Constants qw(:common);
 use Apache::lontexconvert;  use Apache::lontexconvert();
 use Apache::run;  use Apache::style();
 use Apache::londefdef;  use Apache::run();
 use Apache::scripttag;  use Apache::londefdef();
 #==================================================   Main subroutine: xmlparse    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::lonmaxima();
   use Apache::lonlocal;
   
   #====================================   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=();
   
   # stores all Scrit Vars displays for later showing
   my @script_var_displays=();
   
   # 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;
   
   # Part counter hash.   In analysis mode, the
   # problems can use this to record which parts increment the counter
   # by how much.  The counter subs will maintain this hash via
   # their optional part parameters.  Note that the assumption is that
   # analysis is done in one request and therefore it is not necessary to
   # save this information request-to-request.
   
   
   %Apache::lonxml::counters_per_part = ();
   
   #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='';
   
   #  Control whether or not LaTeX symbols should be substituted for their
   #  \ style equivalents...this may be turned off e.g. in an verbatim
   #  environment.
   
   $Apache::lonxml::substitute_LaTeX_symbols = 1; # Starts out on.
   
   sub enable_LaTeX_substitutions {
       $Apache::lonxml::substitute_LaTeX_symbols = 1;
   }
   sub disable_LaTeX_substitutions {
       $Apache::lonxml::substitute_LaTeX_symbols = 0;
   }
   
   sub xmlend {
       my ($target,$parser)=@_;
       my $mode='xml';
       my $status='OPEN';
       if ($Apache::lonhomework::parsing_a_problem ||
    $Apache::lonhomework::parsing_a_task ) {
    $mode='problem';
    $status=$Apache::inputtags::status[-1]; 
       }
       my $discussion;
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
      ['LONCAPA_INTERNAL_no_discussion']);
       if (! exists($env{'form.LONCAPA_INTERNAL_no_discussion'}) ||
           $env{'form.LONCAPA_INTERNAL_no_discussion'} ne 'true') {
           $discussion=&Apache::lonfeedback::list_discussion($mode,$status);
       }
       if ($target eq 'tex') {
    $discussion.='<tex>\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}\end{document}</tex>';
    &Apache::lonxml::newparser($parser,\$discussion,'');
    return '';
       }
   
       return $discussion;
   }
   
   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::lonnet::whichuser();
       unless ($tsymb) {
    $tsymb=$symb;
       }
       unless ($tuname) {
    $tuname=$name;
           $tudom=$domain;
           $tcrsid=$courseid;
       }
   
       my $plainname=&Apache::loncommon::plainname($tuname,$tudom);
   
       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 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::bridgetask::initialize_bridgetask();
    &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) {
    foreach my $file (split(',',$bodytext)) {
        my $location=&Apache::lonnet::filelocation('',$file);
        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 $safehole = new Safe::Hole;
    &init_safespace($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();
    &init_alarm();
    my $finaloutput = &inner_xmlparse($target,\@stack,\@parstack,\@pars,
      $safeeval,\%style_for_target,1);
   
 #------------------------------------- Parse input string (content_file_string)   if (@stack) {
         &warning(&mt('At end of file some tags were still left unclosed:').
  my $token;        ' <tt>&lt;'.join('&gt;</tt>, <tt>&lt;',reverse(@stack)).
          '&gt;</tt>');
  while ($token = $pars->get_token) {   }
    if ($token->[0] eq 'T') {   if ($env{'request.uri'}) {
      $finaloutput .= &Apache::run::evaluate($token->[1],$safeeval,'');      &writeallows($env{'request.uri'});
    } elsif ($token->[0] eq 'S') {   }
      # add tag to stack       &do_registered_ssi();
      push (@stack,$token->[1]);   if ($Apache::lonxml::counter_changed) { &store_counter() }
      # add parameters list to another stack  
      push (@parstack,&parstring($token));   &clean_safespace($safeeval);
        
      if (exists $style_for_target{$token->[1]}) {   if (@script_var_displays) {
        #basically recurse, but we never got more than one level down so just        $finaloutput .= join('',@script_var_displays);
        #create the new context here       undef(@script_var_displays);
        my @innerstack = ();    }
        my @innerparstack = ();   &init_state();
        # use style file definition   if ($env{'form.return_only_error_and_warning_counts'}) {
        $newarg = $style_for_target{$token->[1]};              if ($env{'request.filename'}=~/\.(html|htm|xml)$/i) { 
        my $pat = HTML::TokeParser->new(\$newarg);          my $error=&verify_html($content_file_string);
        my $tokenpat = '';          if ($error) { $errorcount++; }
        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, $safeeval);  
  } elsif ($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);  
  }  
  #pass both the variable to the style tag, and the tag we   
  #are processing inside the <definedtag>  
  $finaloutput .= &Apache::run::evaluate($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);  
        $finaloutput .= &Apache::run::evaluate($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, $safeeval);  
  } elsif ($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);  
  }  
  #pass both the variable to the style tag, and the tag we   
  #are processing inside the <definedtag>  
  $finaloutput .= &Apache::run::evaluate($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);  
        $finaloutput .= &Apache::run::evaluate($result,$safeeval,  
       $parstack[$#parstack]);  
      }       }
      pop @stack;        return "$errorcount:$warningcount";
      pop @parstack;  
    }  
  }   }
  return $finaloutput;   return $finaloutput;
 }  }
   
   sub latex_special_symbols {
       my ($string,$where)=@_;
       #
       #  If e.g. in verbatim mode, then don't substitute.
       #  but return original string.
       #
       if (!($Apache::lonxml::substitute_LaTeX_symbols)) {
    return $string;
       }
       if ($where eq 'header') {
    $string =~ s/\\/\$\\backslash\$/g; # \  -> $\backslash$ per LaTex line by line pg  10.
    $string =~ s/(\$|%|\{|\})/\\$1/g;
    $string=&Apache::lonprintout::character_chart($string);
    # any & or # leftover should be safe to just escape
           $string=~s/([^\\])\&/$1\\\&/g;
           $string=~s/([^\\])\#/$1\\\#/g;
    $string =~ s/_/\\_/g;              # _ -> \_
    $string =~ s/\^/\\\^{}/g;          # ^ -> \^{} 
       } else {
    $string=~s/\\/\\ensuremath{\\backslash}/g;
    $string=~s/\\\%|\%/\\\%/g;
    $string=~s/\\{|{/\\{/g;
    $string=~s/\\}|}/\\}/g;
    $string=~s/\\ensuremath\\{\\backslash\\}/\\ensuremath{\\backslash}/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/\\\&|\&/\\\&/g;
    $string=~s/\\\#|\#/\\\#/g;
           $string=~s/\|/\$\\mid\$/g;
   #single { or } How to escape?
       }
       return $string;
   }
   
   sub inner_xmlparse {
     my ($target,$stack,$parstack,$pars,$safeeval,$style_for_target,$start)=@_;
     my $finaloutput = '';
     my $result;
     my $token;
     my $dontpop=0;
     my $startredirection = $Apache::lonxml::redirection;
     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=$$stack[-1];
    if ($token->[1] =~ /^\Q$lasttag\E$/i) {
       &Apache::lonxml::warning(&mt('Using tag [_1] on line [_2] as end tag to [_3]','&lt;/'.$token->[1].'&gt;','.$token->[3].','&lt;'.$$stack[-1].'&gt;'));
       last;
    } else {
                       &Apache::lonxml::warning(&mt('Found tag [_1] on line [_2] when looking for [_3] in file.','&lt;/'.$token->[1].'&gt;',$token->[3],'&lt;/'.$$stack[-1].'&gt;'));
       &end_tag($stack,$parstack,$token);
    }
       }
       $result = &callsub("end_$token->[1]", $target, $token, $stack,
          $parstack, $pars,$safeeval, $style_for_target);
    }
         } else {
    &Apache::lonxml::error("Unknown token event :$token->[0]:$token->[1]:");
         }
         #evaluate variable refs in result
         if ($Apache::lonxml::post_evaluate &&$result ne "") {
     my $extras;
     if (!$Apache::lonxml::usestyle) {
         $extras=$Apache::lonxml::style_values;
     }
     if ( $#$parstack > -1 ) {
         $result=&Apache::run::evaluate($result,$safeeval,$extras.$$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 ( $start && $target eq 'grade') { &endredirection(); }
     if ( $Apache::lonxml::redirection > $startredirection) {
         while ($Apache::lonxml::redirection > $startredirection) {
     $finaloutput .= &endredirection();
         }
     }
     if (($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)=@_;    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);      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 $deleted=0;
       if (($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,$token);
     }
    }
         }
         if ($target eq 'modified' && $nodefault eq '') {
     if ($currentstring eq '') {
         if ($token->[0] eq 'S') {
     $currentstring = $token->[4];
         } elsif ($token->[0] eq 'E') {
     $currentstring = $token->[2];
         } else {
     $currentstring = $token->[2];
         }
     }
     if ($token->[0] eq 'S') {
         $currentstring.=&Apache::edit::handle_insert();
     } elsif ($token->[0] eq 'E') {
         $currentstring.=&Apache::edit::handle_insertafter($token->[1]);
     }
       }        }
     }      }
     use strict 'refs';      use strict 'refs';
Line 168  sub callsub { Line 654  sub callsub {
   return $currentstring;    return $currentstring;
 }  }
   
 sub parstring {  {
       my %state;
   
       sub init_state {
    undef(%state);
       }
       
       sub set_state {
    my ($key,$value) = @_;
    $state{$key} = $value;
    return $value;
       }
       sub get_state {
    my ($key) = @_;
    return $state{$key};
       }
   }
   
   sub setup_globals {
     my ($request,$target)=@_;
     $Apache::lonxml::request=$request;
     $errorcount=0;
     $warningcount=0;
     $Apache::lonxml::internal_error=0;
     $Apache::lonxml::default_homework_loaded=0;
     $Apache::lonxml::usestyle=1;
     &init_counter();
     &clear_bubble_lines_for_part();
     &init_state();
     &set_state('target',$target);
     @Apache::lonxml::pwd=();
     @Apache::lonxml::extlinks=();
     @script_var_displays=();
     @Apache::lonxml::ssi_info=();
     $Apache::lonxml::post_evaluate=1;
     $Apache::lonxml::warnings_error_header='';
     $Apache::lonxml::substitute_LaTeX_symbols = 1;
     if ($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(); #ended in inner_xmlparse on exit
       $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->deny_only(':dangerous');
     $safeeval->reval('use Math::Complex;');
     $safeeval->permit_only(":default");
     $safeeval->permit("entereval");
     $safeeval->permit(":base_math");
     $safeeval->permit("sort");
     $safeeval->permit("time");
     $safeeval->permit("caller");
     $safeeval->deny("rand");
     $safeeval->deny("srand");
     $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');
     $safehole->wrap(\&Apache::chemresponse::chem_standard_order,$safeeval,
     '&chem_standard_order');
     $safehole->wrap(\&Apache::response::check_status,$safeeval,'&check_status');
     $safehole->wrap(\&Apache::response::implicit_multiplication,$safeeval,'&implicit_multiplication');
   
     $safehole->wrap(\&Apache::lonmaxima::maxima_eval,$safeeval,'&maxima_eval');
     $safehole->wrap(\&Apache::lonmaxima::maxima_check,$safeeval,'&maxima_check');
     $safehole->wrap(\&Apache::lonmaxima::maxima_cas_formula_fix,$safeeval,
     '&maxima_cas_formula_fix');
   
     $safehole->wrap(\&Apache::caparesponse::capa_formula_fix,$safeeval,
     '&capa_formula_fix');
   
     $safehole->wrap(\&Apache::lonlocal::locallocaltime,$safeeval,
                     '&locallocaltime');
   
     $safehole->wrap(\&Math::Cephes::asin,$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');
   
     $safehole->wrap(\&Math::Cephes::Matrix::mat,$safeeval,'&mat');
     $safehole->wrap(\&Math::Cephes::Matrix::new,$safeeval,
     '&Math::Cephes::Matrix::new');
     $safehole->wrap(\&Math::Cephes::Matrix::coef,$safeeval,
     '&Math::Cephes::Matrix::coef');
     $safehole->wrap(\&Math::Cephes::Matrix::clr,$safeeval,
     '&Math::Cephes::Matrix::clr');
     $safehole->wrap(\&Math::Cephes::Matrix::add,$safeeval,
     '&Math::Cephes::Matrix::add');
     $safehole->wrap(\&Math::Cephes::Matrix::sub,$safeeval,
     '&Math::Cephes::Matrix::sub');
     $safehole->wrap(\&Math::Cephes::Matrix::mul,$safeeval,
     '&Math::Cephes::Matrix::mul');
     $safehole->wrap(\&Math::Cephes::Matrix::div,$safeeval,
     '&Math::Cephes::Matrix::div');
     $safehole->wrap(\&Math::Cephes::Matrix::inv,$safeeval,
     '&Math::Cephes::Matrix::inv');
     $safehole->wrap(\&Math::Cephes::Matrix::transp,$safeeval,
     '&Math::Cephes::Matrix::transp');
     $safehole->wrap(\&Math::Cephes::Matrix::simq,$safeeval,
     '&Math::Cephes::Matrix::simq');
     $safehole->wrap(\&Math::Cephes::Matrix::mat_to_vec,$safeeval,
     '&Math::Cephes::Matrix::mat_to_vec');
     $safehole->wrap(\&Math::Cephes::Matrix::vec_to_mat,$safeeval,
     '&Math::Cephes::Matrix::vec_to_mat');
     $safehole->wrap(\&Math::Cephes::Matrix::check,$safeeval,
     '&Math::Cephes::Matrix::check');
     $safehole->wrap(\&Math::Cephes::Matrix::check,$safeeval,
     '&Math::Cephes::Matrix::check');
   
   #  $safehole->wrap(\&Math::Cephes::new_fract,$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');
     $safehole->wrap(\&Apache::loncommon::languages,$safeeval,'&languages');
     $safehole->wrap(\&Apache::lonxml::error,$safeeval,'&LONCAPA_INTERNAL_ERROR');
     $safehole->wrap(\&Apache::lonxml::debug,$safeeval,'&LONCAPA_INTERNAL_DEBUG');
     $safehole->wrap(\&Apache::lonnet::logthis,$safeeval,'&LONCAPA_INTERNAL_LOGTHIS');
     $safehole->wrap(\&Apache::inputtags::finalizeawards,$safeeval,'&LONCAPA_INTERNAL_FINALIZEAWARDS');
     $safehole->wrap(\&Apache::caparesponse::get_sigrange,$safeeval,'&LONCAPA_INTERNAL_get_sigrange');
   #  use Data::Dumper;
   #  $safehole->wrap(\&Data::Dumper::Dumper,$safeeval,'&LONCAPA_INTERNAL_Dumper');
   #need to inspect this class of ops
   # $safeeval->deny(":base_orig");
     $safeeval->permit("require");
     $safeinit .= ';$external::target="'.$target.'";';
     &Apache::run::run($safeinit,$safeeval);
     &initialize_rndseed($safeeval);
   }
   
   sub clean_safespace {
       my ($safeeval) = @_;
       delete_package_recurse($safeeval->{Root});
   }
   
   sub delete_package_recurse {
        my ($package) = @_;
        my @subp;
        {
    no strict 'refs';
    while (my ($key,$val) = each(%{*{"$package\::"}})) {
        if (!defined($val)) { next; }
        local (*ENTRY) = $val;
        if (defined *ENTRY{HASH} && $key =~ /::$/ &&
    $key ne "main::" && $key ne "<none>::")
        {
    my ($p) = $package ne "main" ? "$package\::" : "";
    ($p .= $key) =~ s/::$//;
    push(@subp,$p);
        }
    }
        }
        foreach my $p (@subp) {
    delete_package_recurse($p);
        }
        Symbol::delete_package($package);
   }
   
   sub initialize_rndseed {
       my ($safeeval)=@_;
       my $rndseed;
       my ($symb,$courseid,$domain,$name) = &Apache::lonnet::whichuser();
       $rndseed=&Apache::lonnet::rndseed($symb,$courseid,$domain,$name);
       my $safeinit = '$external::randomseed="'.$rndseed.'";';
       &Apache::lonxml::debug("Setting rndseed to $rndseed");
       &Apache::run::run($safeinit,$safeeval);
   }
   
   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;
       }
   }
   
   {
       my $alarm_depth;
       sub init_alarm {
    alarm(0);
    $alarm_depth=0;
       }
   
       sub start_alarm {
    if ($alarm_depth<1) {
       my $old=alarm($Apache::lonnet::perlvar{'lonScriptTimeout'});
       if ($old) {
    &Apache::lonxml::error("Cancelled an alarm of $old, this shouldn't occur.");
       }
    }
    $alarm_depth++;
       }
   
       sub end_alarm {
    $alarm_depth--;
    if ($alarm_depth<1) { alarm(0); }
       }
   }
   my $metamode_was;
   sub startredirection {
       if (!$Apache::lonxml::redirection) {
    $metamode_was=$Apache::lonxml::metamode;
       }
       $Apache::lonxml::metamode=0;
       $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 debugging information:".join ":",caller);
    return '';
       }
       $Apache::lonxml::redirection--;
       if (!$Apache::lonxml::redirection) {
    $Apache::lonxml::metamode=$metamode_was;
       }
       pop @Apache::lonxml::outputstack;
   }
   sub in_redirection {
       return ($Apache::lonxml::redirection > 0)
   }
   
   sub end_tag {
     my ($tagstack,$parstack,$token)=@_;
     pop(@$tagstack);
     pop(@$parstack);
     &decreasedepth($token);
   }
   
   sub initdepth {
     @Apache::lonxml::depthcounter=();
     undef($Apache::lonxml::last_depth_count);
   }
   
   
   my @timers;
   my $lasttime;
   # @Apache::lonxml::depthcounter -> count of tags that exist so
   #                                  far at each level
   # $Apache::lonxml::last_depth_count -> when ascending, need to
   # remember the count for the level below the current level (for
   # example going from 1_2 -> 1 -> 1_3 need to remember the 2 )
   
   sub increasedepth {
   my ($token) = @_;    my ($token) = @_;
   my $temp='';    push(@Apache::lonxml::depthcounter,$Apache::lonxml::last_depth_count+1);
   map {$temp .= "my \$$_=\"$token->[2]->{$_}\";"} @{$token->[3]};    undef($Apache::lonxml::last_depth_count);
   return $temp;    my $time;
     if ($Apache::lonxml::debug eq "1") {
         push(@timers,[&gettimeofday()]);
         $time=&tv_interval($lasttime);
         $lasttime=[&gettimeofday()];
     }
     my $spacing='  'x($#Apache::lonxml::depthcounter);
     $Apache::lonxml::curdepth=join('_',@Apache::lonxml::depthcounter);
   #  &Apache::lonxml::debug("s$spacing$Apache::lonxml::depth : $Apache::lonxml::olddepth : $Apache::lonxml::curdepth : $token->[1] : $time");
   #print "<br />s $Apache::lonxml::depth : $Apache::lonxml::olddepth : $curdepth : $token->[1]\n";
   }
   
   sub decreasedepth {
     my ($token) = @_;
     if (  $#Apache::lonxml::depthcounter == -1) {
         &Apache::lonxml::warning(&mt("Missing tags, unable to properly run file."));
     }
     $Apache::lonxml::last_depth_count = pop(@Apache::lonxml::depthcounter);
   
     my ($timer,$time);
     if ($Apache::lonxml::debug eq "1") {
         $timer=pop(@timers);
         $time=&tv_interval($lasttime);
         $lasttime=[&gettimeofday()];
     }
     my $spacing='  'x($#Apache::lonxml::depthcounter);
     $Apache::lonxml::curdepth = join('_',@Apache::lonxml::depthcounter);
   #  &Apache::lonxml::debug("e$spacing$Apache::lonxml::depth : $Apache::lonxml::olddepth : $Apache::lonxml::curdepth : $token->[1] : $time : ".&tv_interval($timer));
   #print "<br />e $Apache::lonxml::depth : $Apache::lonxml::olddepth : $token->[1] : $curdepth\n";
   }
   
   sub get_id {
       my ($parstack,$safeeval)=@_;
       my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
       if ($env{'request.state'} eq 'construct' && $id =~ /([._]|[^\w\d\s[:punct:]])/) {
    &error(&mt("ID &quot;[_1]&quot; contains invalid characters, IDs are only allowed to contain letters, numbers, spaces and -",'<tt>'.$id.'</tt>'));
       }
       if ($id =~ /^\s*$/) { $id = $Apache::lonxml::curdepth; }
       return $id;
   }
   
   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')||($token->[0] eq 'D')) {
       if ($token->[0] eq 'T' && $token->[2]) {
    $result.='<![CDATA['.$token->[1].']]>';
       } else {
    $result.=$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) {
       ($result,my $redo)=$result =~ /(.*)\Q$tag\E(.*)/is;
       #&Apache::lonxml::debug('Got a winner with leftovers ::'.$2);
       #&Apache::lonxml::debug('Result is :'.$1);
       $redo=$tag.$redo;
       &Apache::lonxml::newparser($pars,\$redo);
       last;
    }
       }
       return $result
   
   }
   
   #########################################################################
   #                                                                       #
   #           bubble line counter management                              #
   #                                                                       #
   #########################################################################
   
   =pod
   
   For bubble grading mode and exam bubble printing mode, the tracking of
   the current 'bubble line number' is stored in the %env element
   'form.counter', and is modifed and handled by the following routines.
   
   The value of it is stored in $Apache:lonxml::counter when live and
   stored back to env after done.
   
   =item &increment_counter($increment);
   
   Increments the internal counter environment variable a specified amount
   
   Optional Arguments:
     $increment - amount to increment by (defaults to 1)
                  Also 1 if the value is negative or zero.
     $part_response - A concatenation of the part and response id
                      identifying exactly what is being 'answered'.
   
   
   =cut
   
   sub increment_counter {
       my ($increment, $part_response) = @_;
       if ($env{'form.grade_noincrement'}) { return; }
       if (!defined($increment) || $increment le 0) {
    $increment = 1;
       }
       $Apache::lonxml::counter += $increment;
   
       # If the caller supplied the response_id parameter, 
       # Maintain its counter.. creating if necessary.
   
       if (defined($part_response)) {
    if (!defined($Apache::lonxml::counters_per_part{$part_response})) {
       $Apache::lonxml::counters_per_part{$part_response} = 0;
    }
    $Apache::lonxml::counters_per_part{$part_response} += $increment;
    my $new_value = $Apache::lonxml::counters_per_part{$part_response};
       }
   
       $Apache::lonxml::counter_changed=1;
   }
   
   =pod
   
   =item &init_counter($increment);
   
   Initialize the internal counter environment variable
   
   =cut
   
   sub init_counter {
       if ($env{'request.state'} eq 'construct') {
    $Apache::lonxml::counter=1;
    $Apache::lonxml::counter_changed=1;
       } elsif (defined($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});
       $Apache::lonxml::counter_changed=0;
       return '';
   }
   
   {
       my $state;
       sub clear_problem_counter {
    undef($state);
    &Apache::lonnet::delenv('form.counter');
    &Apache::lonxml::init_counter();
    &Apache::lonxml::store_counter();
       }
   
       sub remember_problem_counter {
    &Apache::lonnet::transfer_profile_to_env(undef,undef,1);
    $state = $env{'form.counter'};
       }
   
       sub restore_problem_counter {
    if (defined($state)) {
       &Apache::lonnet::appenv({'form.counter' => $state});
    }
       }
       sub get_problem_counter {
    if ($Apache::lonxml::counter_changed) { &store_counter() }
    &Apache::lonnet::transfer_profile_to_env(undef,undef,1);
    return $env{'form.counter'};
       }
   }
   
   =pod
   
   =item  bubble_lines_for_part(part_response)
   
   Returns the number of lines required to get a response for
   $part_response (this is just $Apache::lonxml::counters_per_part{$part_response}
   
   =cut
   
   sub bubble_lines_for_part {
       my ($part_response) = @_;
   
       if (!defined($Apache::lonxml::counters_per_part{$part_response})) {
    return 0;
       } else {
    return $Apache::lonxml::counters_per_part{$part_response};
       }
 }  }
   
   =pod
   
   =item clear_bubble_lines_for_part
   
   Clears the hash of bubble lines per part.  If a caller
   needs to analyze several resources this should be called between
   resources to reset the hash for each problem being analyzed.
   
   =cut
   
   sub clear_bubble_lines_for_part {
       undef(%Apache::lonxml::counters_per_part);
   }
   
   =pod
   
   =item set_bubble_lines(part_response, value)
   
   If there is a problem part, that for whatever reason
   requires bubble lines that are not
   the same as the counter increment, it can call this sub during
   analysis to set its hash value explicitly.
   
   =cut
   
   sub set_bubble_lines {
       my ($part_response, $value) = @_;
   
       $Apache::lonxml::counters_per_part{$part_response} = $value;
   }
   
   =pod
   
   =item get_bubble_line_hash
   
   Returns the current bubble line hash.  This is assumed to 
   be small so we return a copy
   
   
   =cut
   
   sub get_bubble_line_hash {
       return %Apache::lonxml::counters_per_part;
   }
   
   
   #--------------------------------------------------
   
   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 = $$pars[-1]->get_token)) {
    #&Apache::lonxml::debug("e token:$token->[0]:$depth:$token->[1]:".$#$pars.":".$#Apache::lonxml::pwd);
    if (($token->[0] eq 'T')||($token->[0] eq 'C')||($token->[0] eq 'D')) {
       if ($token->[2]) {
    $result.='<![CDATA['.$token->[1].']]>';
       } else {
    $result.=$token->[1];
       }
    } elsif ($token->[0] eq 'PI') {
       $result.=$token->[2];
    } elsif ($token->[0] eq 'S') {
       if ($token->[1] =~ /^\Q$tag\E$/i) { $depth++; }
       if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_ON$/) { $Apache::lonxml::usestyle=1; }
       if ($token->[1] =~ /^LONCAPA_INTERNAL_TURN_STYLE_OFF$/) { $Apache::lonxml::usestyle=0; }
       $result.=$token->[4];
    } elsif ($token->[0] eq 'E')  {
       if ( $token->[1] =~ /^\Q$tag\E$/i) { $depth--; }
       #skip sending back the last end tag
       if ($depth == 0 && exists($$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 = $$pars[-1]->get_token) {
    #&Apache::lonxml::debug("s token:$token->[0]:$depth:$token->[1]");
    if (($token->[0] eq 'T')||($token->[0] eq 'C')||
       ($token->[0] eq 'D')) {
       if ($token->[2]) {
    $result.='<![CDATA['.$token->[1].']]>';
       } else {
    $result.=$token->[1];
       }
    } elsif ($token->[0] eq 'PI') {
       $result.=$token->[2];
    } elsif ($token->[0] eq 'S') {
       if ( $token->[1] =~ /^\Q$tag\E$/i) {
    $$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));
     $$parser[-1]->xml_mode(1);
     $$parser[-1]->marked_sections(1);
     if ( $dir eq '' ) {
       push (@Apache::lonxml::pwd, $Apache::lonxml::pwd[$#Apache::lonxml::pwd]);
     } else {
       push (@Apache::lonxml::pwd, $dir);
     } 
   }
   
   sub parstring {
       my ($token) = @_;
       my (@vars,@values);
       foreach my $attr (@{$token->[3]}) {
    if ($attr!~/\W/) {
       my $val=$token->[2]->{$attr};
       $val =~ s/([\%\@\\\"\'])/\\$1/g;
       $val =~ s/(\$[^\{a-zA-Z_])/\\$1/g;
       $val =~ s/(\$)$/\\$1/;
       #if ($val =~ m/^[\%\@]/) { $val="\\".$val; }
       push(@vars,"\$$attr");
       push(@values,"\"$val\"");
    }
       }
       my $var_init = 
    (@vars) ? 'my ('.join(',',@vars).') = ('.join(',',@values).');'
           : '';
       return $var_init;
   }
   
   sub extlink {
       my ($res,$exact)=@_;
       if (!$exact) {
    $res=&Apache::lonnet::hreflocation($Apache::lonxml::pwd[-1],$res);
       }
       push(@Apache::lonxml::extlinks,$res)  
   }
   
   sub writeallows {
       unless ($#extlinks>=0) { return; }
       my $thisurl = &Apache::lonnet::clutter(shift);
       if ($env{'httpref.'.$thisurl}) {
    $thisurl=$env{'httpref.'.$thisurl};
       }
       my $thisdir=$thisurl;
       $thisdir=~s/\/[^\/]+$//;
       my %httpref=();
       foreach (@extlinks) {
          $httpref{'httpref.'.
            &Apache::lonnet::hreflocation($thisdir,&unescape($_))}=$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);
       }
   }
   
   sub add_script_result {
       my ($display) = @_;
       push(@script_var_displays, $display);
   }
   
   #
   # 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;
           $fh->close();
           return 1;
       } else {
    &warning(&mt('Unable to save file [_1]','<tt>'.$file.'</tt>'));
    return 0;
       }
   }
   
   sub createnewhtml {
       my $title=&mt('Title of document goes here');
       my $body=&mt('Body of document goes here');
       my $filecontents=(<<SIMPLECONTENT);
   <html>
   <head>
   <title>$title</title>
   </head>
   <body bgcolor="#FFFFFF">
   $body
   </body>
   </html>
   SIMPLECONTENT
       return $filecontents;
   }
   
   sub createnewsty {
     my $filecontents=(<<SIMPLECONTENT);
   <definetag name="">
       <render>
          <web></web>
          <tex></tex>
       </render>
   </definetag>
   SIMPLECONTENT
     return $filecontents;
   }
   
   sub verify_html {
       my ($filecontents)=@_;
       if ($filecontents!~/(?:\<|\&lt\;)(?:html|xml)[^\<]*(?:\>|\&gt\;)/is) {
          return &mt('File does not have [_1] or [_2] starting tag','&lt;html&gt;','&lt;xml&gt;');
       }
       if ($filecontents!~/(?:\<|\&lt\;)\/(?:html|xml)(?:\>|\&gt\;)/is) {
          return &mt('File does not have [_1] or [_2] ending tag','&lt;html&gt;','&lt;xml&gt;');
       }
       if ($filecontents!~/(?:\<|\&lt\;)(?:body|frameset)[^\<]*(?:\>|\&gt\;)/is) {
          return &mt('File does not have [_1] or [_2] starting tag','&lt;body&gt;','&lt;frameset&gt;');
       }
       if ($filecontents!~/(?:\<|\&lt\;)\/(?:body|frameset)[^\<]*(?:\>|\&gt\;)/is) {
          return &mt('File does not have [_1] or [_2] ending tag','&lt;body&gt;','&lt;frameset&gt;');
       }
       return '';
   }
   
   sub renderingoptions {
       my %langchoices=('' => '');
       foreach (&Apache::loncommon::languageids()) {
           if (&Apache::loncommon::supportedlanguagecode($_)) {
               $langchoices{&Apache::loncommon::supportedlanguagecode($_)}
                          = &Apache::loncommon::plainlanguagedescription($_);
           }
       }
       return
          '<span class="LC_nobreak">'.
          &mt('Language:').' '.
          &Apache::loncommon::select_form($env{'form.languages'},'languages',
                                                        %langchoices).'
        </span>
        <span class="LC_nobreak">'.
          &mt('Math Rendering:').' '.
          &Apache::loncommon::select_form($env{'form.texengine'},'texengine',
                                                        ('' => '',
                                                         'tth' => 'tth (TeX to HTML)',
                                                         'jsMath' => 'jsMath',
                                                         'mimetex' => 'mimetex (Convert to Images)')).'
        </span>';
   }
   
   sub inserteditinfo {
         my ($filecontents, $filetype, $filename)=@_;
         $filecontents = &HTML::Entities::encode($filecontents,'<>&"');
         my $xml_help = '';
         my $initialize='';
         my $textarea_id = 'filecont';
         my ($add_to_onload, $add_to_onresize);
         $initialize=&Apache::lonhtmlcommon::spellheader();
         if ($filetype eq 'html' 
     && (!&Apache::lonhtmlcommon::htmlareablocked() &&
         &Apache::lonhtmlcommon::htmlareabrowser())) {
     $textarea_id .= '___Frame';
     my $lang = &Apache::lonhtmlcommon::htmlarea_lang();
     $initialize.=(<<FULLPAGE);
   <script type="text/javascript">
   lonca
       function initDocument() {
           var oFCKeditor = new FCKeditor('filecont');
    oFCKeditor.Config['CustomConfigurationsPath'] = '/fckeditor/loncapaconfig.js'  ;
    oFCKeditor.Config['FullPage'] = true
    oFCKeditor.Config['AutoDetectLanguage'] = false;
           oFCKeditor.Config['DefaultLanguage'] = "$lang";
    oFCKeditor.ReplaceTextarea();
       }
       function check_if_dirty(editor) {
    if (editor.IsDirty()) {
       unClean();
    }
       }
       function FCKeditor_OnComplete(editor) {
    editor.Events.AttachEvent("OnSelectionChange",check_if_dirty);
    resize_textarea('$textarea_id','LC_aftertextarea');
       }
   </script>
   FULLPAGE
         } else {
     $initialize.=(<<FULLPAGE);
   <script type="text/javascript">
       function initDocument() {
    resize_textarea('$textarea_id','LC_aftertextarea');
       }
   </script>
   FULLPAGE
         }
   
         $add_to_onload = 'initDocument();';
         $add_to_onresize = "resize_textarea('$textarea_id','LC_aftertextarea');";
   
         if ($filetype eq 'html') {
     $xml_help=&Apache::loncommon::helpLatexCheatsheet();
         }
   
         my $titledisplay=&display_title();
         my %lt=&Apache::lonlocal::texthash('st' => 'Save and Edit',
    'vi' => 'Save and View',
    'dv' => 'Discard Edits and View',
    'un' => 'undo',
    'ed' => 'Edit');
         my $spelllink .=&Apache::lonhtmlcommon::spelllink('xmledit','filecont');
         my $textarea_events = &Apache::edit::element_change_detection();
         my $form_events     = &Apache::edit::form_change_detection();
         my $htmlerror;
         if ($filetype eq 'html') {
             $htmlerror=&verify_html($filecontents);
             if ($htmlerror) {
                 $htmlerror='<span class="LC_error">'.$htmlerror.'</span>';
             }
         }
         my $editfooter=(<<ENDFOOTER);
   $initialize
   <a name="editsection" />
   <form $form_events method="post" name="xmledit">
     <div class="LC_edit_problem_editxml_header">
       <table class="LC_edit_problem_header_title"><tr><td>
           $filename
         </td><td align="right">
           $xml_help
         </td></tr>
       </table>
       <div class="LC_edit_problem_discards">
         <input type="submit" name="discardview" accesskey="d" value="$lt{'dv'}" />
         <input type="submit" name="Undo" accesskey="u" value="$lt{'un'}" />
         $spelllink $htmlerror
       </div>
       <div class="LC_edit_problem_saves">
         <input type="submit" name="savethisfile" accesskey="s" value="$lt{'st'}" />
         <input type="submit" name="viewmode" accesskey="v" value="$lt{'vi'}" />
       </div>
     </div>
     <textarea $textarea_events style="width:100%" cols="80" rows="44" name="filecont" id="filecont">$filecontents</textarea>
     <div id="LC_aftertextarea">
       <br />
       $titledisplay
     </div>
   </form>
   </body>
   ENDFOOTER
         return ($editfooter,$add_to_onload,$add_to_onresize);;
   }
   
   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'};
       
       &Apache::loncommon::content_type($request,'text/html');
       &Apache::loncommon::no_cache($request);
       if ($env{'request.state'} eq 'published') {
    $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
         'lastrevisiondate'));
       }
       $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 {
    $filetype='html';
       }
   #
   # Edit action? Save file.
   #
       if (!($env{'request.state'} eq 'published')) {
    if ($env{'form.savethisfile'} || $env{'form.viewmode'} || $env{'form.Undo'}) {
       my $html_file=&Apache::lonnet::getfile($file);
       my $error = &Apache::lonhomework::handle_save_or_undo($request, \$html_file, \$env{'form.filecont'});
               if ($env{'form.savethisfile'}) {
                   $env{'form.editmode'}='Edit'; #force edit mode
               }
    }
       }
       my %mystyle;
       my $result = '';
       my $filecontents=&Apache::lonnet::getfile($file);
       if ($filecontents eq -1) {
    my $start_page=&Apache::loncommon::start_page('File Error');
    my $end_page=&Apache::loncommon::end_page();
    my $fnf=&mt('File not found');
    $result=(<<ENDNOTFOUND);
   $start_page
   <b>$fnf: $file</b>
   $end_page
   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 ($filecontents=~/BEGIN LON-CAPA Internal/) {
    &Apache::lonxml::error(&mt('This file appears to be a rendering of a LON-CAPA resource. If this is correct, this resource will act very oddly and incorrectly.'));
       }
   #
   # we are in construction space, see if edit mode forced
               &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['editmode']);
    }
    if (!$env{'form.editmode'} || $env{'form.viewmode'} || $env{'form.discardview'}) {
       &Apache::structuretags::reset_problem_globals();
       $result = &Apache::lonxml::xmlparse($request,$target,$filecontents,
    '',%mystyle);
       # .html files may contain <problem> or <Task> need to clean
       # up if it did
       &Apache::structuretags::reset_problem_globals();
       &Apache::lonhomework::finished_parsing();
       &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
       ['rawmode']);
       if ($env{'form.rawmode'}) { $result = $filecontents; }
       if ($filetype eq 'sty') {
    my $controls =
       ($env{'request.state'} eq 'construct') ? &Apache::londefdef::edit_controls()
                                              : '';
    my %options = ('bgcolor' => '#FFFFFF');
    $result = 
       &Apache::loncommon::start_page(undef,undef,\%options).
       $controls.
       $result.
       &Apache::loncommon::end_page();
       }
    }
       }
   
   #
   # Edit action? Insert editing commands
   #
       unless ($env{'request.state'} eq 'published') {
    if ($env{'form.editmode'} && (!($env{'form.viewmode'})) && (!($env{'form.discardview'})))
    {
       my $displayfile=$request->uri;
       $displayfile=~s/^\/[^\/]*//;
   
       my ($edit_info, $add_to_onload, $add_to_onresize)=
    &inserteditinfo($filecontents,$filetype,$displayfile);
   
       my %options = 
    ('add_entries' =>
                      {'onresize' => $add_to_onresize,
       'onload'   => $add_to_onload,   });
   
       if ($env{'environment.remote'} ne 'off') {
    $options{'bgcolor'}   = '#FFFFFF';
    $options{'only_body'} = 1;
       }
       my $js =
    &Apache::edit::js_change_detection().
    &Apache::loncommon::resize_textarea_js();
       my $start_page = &Apache::loncommon::start_page(undef,$js,
       \%options);
       $result=$start_page.
    &Apache::lonxml::message_location().
    $edit_info.
    &Apache::loncommon::end_page();
    }
       }
       if ($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 "
                     .&mt('Construction Space')."';</script>";
       }
       return $result;
   }
   
   sub debug {
       if ($Apache::lonxml::debug eq "1") {
    $|=1;
    my $request=$Apache::lonxml::request;
    if (!$request) {
       eval { $request=Apache->request; };
    }
    if (!$request) {
       eval { $request=Apache2::RequestUtil->request; };
    }
    $request->print('<font size="-2"><pre>DEBUG:'.&HTML::Entities::encode($_[0],'<>&"')."</pre></font>\n");
    #&Apache::lonnet::logthis($_[0]);
       }
   }
   
   sub show_error_warn_msg {
       if ($env{'request.filename'} eq '/home/httpd/html/res/lib/templates/simpleproblem.problem' &&
    &Apache::lonnet::allowed('mdc',$env{'request.course.id'})) {
    return 1;
       }
       return (($Apache::lonxml::debug eq 1) ||
       ($env{'request.state'} eq 'construct') ||
       ($Apache::lonhomework::browse eq 'F'
        &&
        $env{'form.show_errors'} eq 'on'));
   }
   
   sub error {
       my @errors = @_;
   
       $errorcount++;
   
       $Apache::lonxml::internal_error=1;
   
       if (defined($Apache::inputtags::part)) {
    if ( @Apache::inputtags::response ) {
       push(@errors,
    &mt("This error occurred while processing response [_1] in part [_2]",
        $Apache::inputtags::response[-1],
        $Apache::inputtags::part));
    } else {
       push(@errors,
    &mt("This error occurred while processing part [_1]",
        $Apache::inputtags::part));
    }
       }
   
       if ( &show_error_warn_msg() ) {
    # If printing in construction space, put the error inside <pre></pre>
    push(@Apache::lonxml::error_messages,
        $Apache::lonxml::warnings_error_header
                .'<div class="LC_error">'
                .'<b>'.&mt('ERROR:').' </b>'.join("<br />\n",@errors)
                ."</div>\n");
    $Apache::lonxml::warnings_error_header='';
       } else {
    my $errormsg;
    my ($symb)=&Apache::lonnet::symbread();
    if ( !$symb ) {
       #public or browsers
       $errormsg=&mt("An error occurred while processing this resource. The author has been notified.");
    }
    my $host=$Apache::lonnet::perlvar{'lonHostID'};
    push(@errors,
           &mt("The error occurred on host [_1]",
                "<tt>$host</tt>"));
   
    my $msg = join('<br />', @errors);
   
    #notify author
    &Apache::lonmsg::author_res_msg($env{'request.filename'},$msg);
    #notify course
    if ( $symb && $env{'request.course.id'} ) {
       my $cnum=$env{'course.'.$env{'request.course.id'}.'.num'};
       my $cdom=$env{'course.'.$env{'request.course.id'}.'.domain'};
       my (undef,%users)=&Apache::lonmsg::decide_receiver(undef,0,1,1,1);
       my $declutter=&Apache::lonnet::declutter($env{'request.filename'});
               my $baseurl = &Apache::lonnet::clutter($declutter);
       my @userlist;
       foreach (keys %users) {
    my ($user,$domain) = split(/:/, $_);
    push(@userlist,"$user\@$domain");
    my $key=$declutter.'_'.$user.'_'.$domain;
    my %lastnotified=&Apache::lonnet::get('nohist_xmlerrornotifications',
         [$key],
         $cdom,$cnum);
    my $now=time;
    if ($now-$lastnotified{$key}>86400) {
                       my $title = &Apache::lonnet::gettitle($symb);
                       my $sentmessage;
       &Apache::lonmsg::user_normal_msg($user,$domain,
           "Error [$title]",$msg,'',$baseurl,'','',
                           \$sentmessage,$symb,$title,1);
       &Apache::lonnet::put('nohist_xmlerrornotifications',
    {$key => $now},
    $cdom,$cnum);
    }
       }
       if ($env{'request.role.adv'}) {
    $errormsg=&mt("An error occurred while processing this resource. The course personnel ([_1]) and the author have been notified.",join(', ',@userlist));
       } else {
    $errormsg=&mt("An error occurred while processing this resource. The instructor has been notified.");
       }
    }
    push(@Apache::lonxml::error_messages,"<b>$errormsg</b> <br />");
       }
   }
   
   sub warning {
       $warningcount++;
     
       if ($env{'form.grade_target'} ne 'tex') {
    if ( &show_error_warn_msg() ) {
       push(@Apache::lonxml::warning_messages,
    $Apache::lonxml::warnings_error_header
                   .'<div class="LC_warning">'
                   .&mt('[_1]W[_2]ARNING','<b>','</b>')."<b>:</b> ".join('<br />',@_)
                   ."</div>\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($2)/ei) {
       return &Apache::run::run("{$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)/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 =~ /^[\$\@\%][a-zA-Z_]\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_xml {
       my $parser = HTML::LCParser->new($Apache::lonnet::perlvar{'lonTabDir'}
        .'/insertlist.xml');
       my ($tagnum,$in_help)=(0,0);
       my @alltags;
       my $tag;
       while (my $token = $parser->get_token()) {
    if ($token->[0] eq 'S') {
       my $key;
       if      ($token->[1] eq 'tag') {
    $tag = $token->[2]{'name'};
    $insertlist{"$tagnum.tag"} = $tag;
    $insertlist{"$tag.num"}   = $tagnum;
    push(@alltags,$tag);
       } elsif ($in_help && $token->[1] eq 'file') {
    $key = $tag.'.helpfile';
       } elsif ($in_help && $token->[1] eq 'description') {
    $key = $tag.'.helpdesc';
       } elsif ($token->[1] eq 'description' ||
        $token->[1] eq 'color'       ||
        $token->[1] eq 'show'          ) {
    $key = $tag.'.'.$token->[1];
       } elsif ($token->[1] eq 'insert_sub') {
    $key = $tag.'.function';
       } elsif ($token->[1] eq 'help') {
    $in_help=1;
       } elsif ($token->[1] eq 'allow') {
    $key = $tag.'.allow';
       }
       if (defined($key)) {
    $insertlist{$key} = $parser->get_text();
    $insertlist{$key} =~ s/(^\s*|\s*$ )//gx;
       }
    } elsif ($token->[0] eq 'E') {
       if      ($token->[1] eq 'tag') {
    undef($tag);
    $tagnum++;
       } elsif ($token->[1] eq 'help') {
    undef($in_help);
       }
    }
       }
       
       # parse the allows and ignore tags set to <show>no</show>
       foreach my $tag (@alltags) {
           next if (!exists($insertlist{"$tag.allow"}));
    my $allow =  $insertlist{"$tag.allow"};
           foreach my $element (split(',',$allow)) {
       $element =~ s/(^\s*|\s*$ )//gx;
       if (!exists($insertlist{"$element.show"})
                   || $insertlist{"$element.show"} ne 'no') {
    push(@{ $insertlist{$tag.'.which'} },$element);
       }
    }
       }
   }
   
   sub register_insert {
       return &register_insert_xml(@_);
   #    &dump_insertlist('2');
   }
   
   sub dump_insertlist {
       my ($ext) = @_;
       open(XML,">/tmp/insertlist.xml.$ext");
       print XML ("<insertlist>");
       my $i=0;
   
       while (exists($insertlist{"$i.tag"})) {
    my $tag = $insertlist{"$i.tag"};
    print XML ("
   \t<tag name=\"$tag\">");
    if (defined($insertlist{"$tag.description"})) {
       print XML ("
   \t\t<description>".$insertlist{"$tag.description"}."</description>");
    }
    if (defined($insertlist{"$tag.color"})) {
       print XML ("
   \t\t<color>".$insertlist{"$tag.color"}."</color>");
    }
    if (defined($insertlist{"$tag.function"})) {
       print XML ("
   \t\t<insert_sub>".$insertlist{"$tag.function"}."</insert_sub>");
    }
    if (defined($insertlist{"$tag.show"})
       && $insertlist{"$tag.show"} ne 'yes') {
       print XML ("
   \t\t<show>".$insertlist{"$tag.show"}."</show>");
    }
    if (defined($insertlist{"$tag.helpfile"})) {
       print XML ("
   \t\t<help>
   \t\t\t<file>".$insertlist{"$tag.helpfile"}."</file>");
       if ($insertlist{"$tag.helpdesc"} ne '') {
    print XML ("
   \t\t\t<description>".$insertlist{"$tag.helpdesc"}."</description>");
       }
       print XML ("
   \t\t</help>");
    }
    if (defined($insertlist{"$tag.which"})) {
       print XML ("
   \t\t<allow>".join(',',sort(@{ $insertlist{"$tag.which"} }))."</allow>");
    }
    print XML ("
   \t</tag>");
    $i++;
       }
       print XML ("\n</insertlist>\n");
       close(XML);
   }
   
   sub description {
       my ($token)=@_;
       my $tag = &get_tag($token);
       return $insertlist{$tag.'.description'};
   }
   
   # Returns a list containing the help file, and the description
   sub helpinfo {
       my ($token)=@_;
       my $tag = &get_tag($token);
       return ($insertlist{$tag.'.helpfile'}, $insertlist{$tag.'.helpdesc'});
   }
   
   sub get_tag {
       my ($token)=@_;
       my $tagnum;
       my $tag=$token->[1];
       foreach my $namespace (reverse(@Apache::lonxml::namespace)) {
    my $testtag = $namespace.'::'.$tag;
    $tagnum = $insertlist{"$testtag.num"};
    last if (defined($tagnum));
       }
       if (!defined($tagnum)) {
    $tagnum = $Apache::lonxml::insertlist{"$tag.num"};
       }
       return $insertlist{"$tagnum.tag"};
   }
   
   ############################################################
   #                                           PDF-FORM-METHODS
   
   =pod
   
   =item &print_pdf_radiobutton(fieldname, value,  text)
   
   Returns a latexline to generate a PDF-Form-Radiobutton with Text.
   
   $fieldname: PDF internalname of the radiobutton
   $value:     Value of radiobutton (read when dumping the PDF data)
   $text:      Text on the rightside of the radiobutton
   
   =cut
   sub print_pdf_radiobutton {
       my $result = '';
       my ($fieldName, $value, $text) = @_;
       $result .= '\begin{tabularx}{\textwidth}{p{0cm}X}'."\n";
       $result .= '\radioButton[\symbolchoice{circle}]{'. 
                  $fieldName.'}{10bp}{10bp}{'.$value.'}&'.$text."\n";
       $result .= '\end{tabularx}' . "\n";
       $result .= '\hspace{2mm}' . "\n";
       return $result;
   }
   
   
   =pod
   
   =item &print_pdf_start_combobox(fieldname)
   
   Starts a latexline to generate a PDF-Form-Combobox with text.
   
   $fieldname: PDF internal name of the Combobox
   
   =cut
   sub print_pdf_start_combobox {
       my $result;
       my ($fieldName) = @_;
       $result .= '\begin{tabularx}{\textwidth}{p{2.5cm}X}'."\n";
       $result .= '\comboBox[]{'.$fieldName.'}{2.3cm}{14bp}{'; # 
   
       return $result;
   }
   
   
   =pod
   
   =item &print_pdf_add_combobox_option(options)
   
   Generates a latexline to add Options to a PDF-Form-ComboBox.
   
   $option: PDF internal name of the Combobox-Option
   
   =cut
   sub print_pdf_add_combobox_option {
   
       my $result;
       my ($option) = @_;  
   
       $result .= '('.$option.')';
       
       return $result;
   }
   
   
   =pod
   
   =item &print_pdf_end_combobox(text) {
   
   Returns latexcode to end a PDF-Form-Combobox with text.
   
   =cut
   sub print_pdf_end_combobox {
       my $result;
       my ($text) = @_;
   
       $result .= '}&'.$text."\\\\\n";
       $result .= '\end{tabularx}' . "\n";
       $result .= '\hspace{2mm}' . "\n";
       return $result;
   }
   
   
   =pod
   
   =item &print_pdf_hiddenField(fieldname, user, domain)
   
   Returns a latexline to generate a PDF-Form-hiddenField with userdata.
   
   $fieldname label for hiddentextfield
   $user:    name of user
   $domain:  domain of user
   
   =cut
   sub print_pdf_hiddenfield {
       my $result;
       my ($fieldname, $user, $domain) = @_;
   
       $result .= '\textField [\F{\FHidden}\F{-\FPrint}\V{'.$domain.'&'.$user.'}]{'.$fieldname.'}{0in}{0in}'."\n";
   
       return $result;
   }
   
 1;  1;
 __END__  __END__
   

Removed from v.1.10  
changed lines
  Added in v.1.491


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