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

Diff for /loncom/homework/structuretags.pm between versions 1.114 and 1.418

version 1.114, 2002/09/16 20:40:38 version 1.418, 2008/02/08 18:01:30
Line 25 Line 25
 #  #
 # http://www.lon-capa.org/  # http://www.lon-capa.org/
 #  #
 # 2/19 Guy  ###
 # 6/26/2001 fixed extra web display at end of <web></web> tags  
 # 8/17,8/18,8/20 Gerd Kortemeyer  
   
 package Apache::structuretags;   package Apache::structuretags; 
   
 use strict;  use strict;
 use Apache::lonnet;  use Apache::lonnet;
 use Apache::File();  use Apache::File();
   use Apache::lonmenu;
   use Apache::lonlocal;
   use Apache::lonxml;
   use Apache::lonenc();
   use Time::HiRes qw( gettimeofday tv_interval );
   use lib '/home/httpd/lib/perl/';
   use LONCAPA;
    
 BEGIN {  BEGIN {
   &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));      &Apache::lonxml::register('Apache::structuretags',('block','languageblock','translated','instructorcomment','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','problemtype','startouttext','endouttext','simpleeditbutton','definetag'));
 #  &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))  
 }  }
   
 sub start_web {  sub start_web {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);      if ($target ne 'edit' && $target ne 'modified') {
   if ($target eq 'web') {   my $bodytext=&Apache::lonxml::get_all_text("/web",$parser,$style);
     return $bodytext;   if ($target eq 'web' || $target eq 'webgrade') {
   }       return $bodytext;
   return '';   }
       } elsif ($target eq "edit" ) {
    my $bodytext = 
       &Apache::lonxml::get_all_text_unbalanced("/web",$parser);
    my $result = &Apache::edit::tag_start($target,$token);
    $result .= &Apache::edit::editfield($token->[1],$bodytext,'',80,1);
    return $result;
       } elsif ( $target eq "modified" ) {
    return $token->[4].&Apache::edit::modifiedfield("/web",$parser);
       }
       return '';
 }  }
   
 sub end_web {  sub end_web {
Line 54  sub end_web { Line 69  sub end_web {
 }  }
   
 sub start_tex {  sub start_tex {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);      my $result='';
   if ($target eq 'tex') {      if ($target ne 'edit' && $target ne 'modified') {
       return $bodytext.' ';   my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser,$style);
   }   if ($target eq 'tex') {
   return '';      return $bodytext.' ';
    }
       } elsif ($target eq "edit" ) {
    my $bodytext = 
       &Apache::lonxml::get_all_text_unbalanced("/tex",$parser);
    my $result = &Apache::edit::tag_start($target,$token);
    $result .= &Apache::edit::editfield($token->[1],$bodytext,'',80,1);
    return $result;
       } elsif ( $target eq "modified" ) {
    return $token->[4].&Apache::edit::modifiedfield("/tex",$parser);
       }
       return $result;;
 }  }
   
 sub end_tex {  sub end_tex {
     return '';      return '';
 }  }
   
   sub homework_js {
       return &Apache::loncommon::resize_textarea_js().
              &setmode_javascript().
    <<'JS';
   <script type="text/javascript">
   function setSubmittedPart (part) {
      this.document.lonhomework.submitted.value="part_"+part;
   }
   
   function image_response_click (which, e) {
       init_geometry();
       if (!e) { e = window.event; } //IE
       var input_element = document.lonhomework.elements[which];
       var token_element = document.lonhomework.elements[which+'_token'];
       var token = token_element.value;
       var img_element   = document.getElementById(which+'_imageresponse');
       var x= e.clientX-getX(img_element)+Geometry.getHorizontalScroll();
       var y= e.clientY-getY(img_element)+Geometry.getVerticalScroll();
       var click = x+':'+y;
       input_element.value = click;
       img_element.src = '/adm/randomlabel.png?token='+token+'&clickdata='+click;
   }
   
   </script>
   JS
   }
   
   sub setmode_javascript {
       return <<"ENDSCRIPT";
   <script type="text/javascript">
   function setmode(form,probmode) {
       form.problemmode.value = probmode;
       form.submit();
   }
   </script>
   ENDSCRIPT
   }
   
 sub page_start {  sub page_start {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$name,
   my %found;   $extra_head)=@_;
   foreach my $taginside ($tagstack) {      my %found;
     foreach my $taglookedfor ('html','body','form') {      foreach my $taginside (@$tagstack) {
       if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }   foreach my $taglookedfor ('html','body','form') {
     }      if ($taginside =~ /^$taglookedfor$/i) {$found{$taglookedfor} = 1;}
   }   }
       }
   my $result;  
   my $head_tag_start;      if ($target eq 'tex') {
   if (!defined($found{'html'})) {   return
     $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,      &Apache::londefdef::start_html($target,$token,$tagstack,
    $parser,$safeeval);     $parstack,$parser,$safeeval);
     $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);      }
   }  
   my $body_tag_start;      $extra_head .= &homework_js();
   if (!defined($found{'body'})) {  
     $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.      my %body_args;
       'onUnload="'.&Apache::lonxml::unloadevents().'" ';      if (defined($found{'html'})) {
     my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);   $body_args{'skip_phases'}{'head'}=1;
     if ($background) {  
       $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=  
  $background;  
       $body_tag_start.='background="'.$background.'" ';  
     } else {      } else {
       my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);  
       if ($bgcolor) {   $extra_head .= &Apache::lonhtmlcommon::spellheader();
  $body_tag_start.='bgcolor="'.$bgcolor.'" ';  
       } else {   $extra_head .= &Apache::londefdef::generate_css_links();
  $body_tag_start.='bgcolor="#ffffff"';  
       }   if ($env{'request.state'} eq 'construct') {
     }      $extra_head.=&Apache::edit::js_change_detection().
     $body_tag_start.='>';   "<script type=\"text/javascript\">\n".
   }   "if (typeof swmenu != 'undefined') {swmenu.currentURL=null;}\n".
   my $form_tag_start;   &Apache::loncommon::browser_and_searcher_javascript().
   if (!defined($found{'form'})) {                  "\n</script>\n";
     $form_tag_start='<form name="lonhomework" method="POST" action="'.   }
       $ENV{'request.uri'}.'">';      }
   }  
   return ($result,$head_tag_start,$body_tag_start,$form_tag_start);      if (defined($found{'body'})) {
    $body_args{'skip_phases'}{'body'}=1;
       } elsif (!defined($found{'body'}) 
        && $env{'request.state'} eq 'construct') {
    if ($target eq 'web' || $target eq 'edit') {
       if ($env{'environment.remote'} ne 'off') {
    $body_args{'only_body'}  = 1;
       }
    }
       } elsif (!defined($found{'body'})) {
    my %add_entries;
    my $background=&Apache::lonxml::get_param('background',$parstack,
     $safeeval);
    if ($background ne '' ) {
       $add_entries{'background'} = $background;
    }
   
    my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,
          $safeeval);
           if ($bgcolor eq '' ) { $bgcolor = '#FFFFFF'; }
   
    $body_args{'bgcolor'}        = $bgcolor;
    $body_args{'no_title'}       = 1;
    $body_args{'force_register'} = 1;
    $body_args{'add_entries'}    = \%add_entries;
    if ($env{'environment.remote'} eq 'off'
       && $env{'request.state'} eq   'construct') {
       $body_args{'only_body'}  = 1;
    }
       }
       $body_args{'no_auto_mt_title'} = 1;
       my $page_start = &Apache::loncommon::start_page($name,$extra_head,
       \%body_args);
   
       if (!defined($found{'body'}) 
    && $env{'request.state'} ne 'construct'
    && ($target eq 'web' || $target eq 'webgrade')) {
   
    my ($symb,undef,undef,undef,$publicuser)= &Apache::lonnet::whichuser();
    if ($symb eq '' && !$publicuser) {
       my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
       $help=&mt("Browsing resource, all submissions are temporary.")."<br />";
       $page_start .= $help;
    }
       }
   
       if (!defined($found{'body'}) && $env{'request.state'} ne 'construct') {
    $page_start .= &Apache::lonxml::message_location();
       }
       
       my $form_tag_start;
       if (!defined($found{'form'})) {
    $form_tag_start='<form name="lonhomework" enctype="multipart/form-data" method="post" action="';
    my $uri = &Apache::lonenc::check_encrypt($env{'request.uri'});
    $form_tag_start.=$uri.'" ';
    if ($target eq 'edit') {
       $form_tag_start.=&Apache::edit::form_change_detection();
    }
    $form_tag_start.='>'."\n";
   
    my $symb=&Apache::lonnet::symbread();
    if ($symb =~ /\S/) {
       $symb=
    &HTML::Entities::encode(&Apache::lonenc::check_encrypt($symb));
       $form_tag_start.=
    "\t".'<input type="hidden" name="symb" value="'.$symb.'" />'."\n";
    }
       }
       return ($page_start,$form_tag_start);
 }  }
   
   #use Time::HiRes();
 sub get_resource_name {  sub get_resource_name {
   my ($parstack,$safeeval)=@_;      my ($parstack,$safeeval)=@_;
   my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);      my $name;
   if ($name eq '') {       if (defined($Apache::lonhomework::name)) {
     $name=&Apache::lonnet::EXT('resource.title');   $name = $Apache::lonhomework::name;
     if ($name eq 'con_lost') { $name = ''; }      } else {
   }   my ($symb)=&Apache::lonnet::whichuser();
   $Apache::lonhomework::name=$name;   $name=&Apache::lonnet::gettitle($symb);
   return $name;   if ($name eq '') {
       $name=&Apache::lonnet::EXT('resource.title');
       if ($name eq 'con_lost') { $name = ''; }
    }
    if ($name!~/\S+/) {
       $name=$env{'request.uri'};
       $name=~s-.*/([^/]+)$-$1-;
    }
    # The name has had html tags escaped:
          
    $name=~s/&lt;/</gs;
    $name=~s/&gt;/>/gs;
   
    $Apache::lonhomework::name=$name;
       }
       return $name;
 }  }
   
 sub setup_rndseed {  sub setup_rndseed {
   my ($safeeval)=@_;      my ($safeeval)=@_;
   my $rndseed;      my $rndseed;
   if ($ENV{'request.state'} eq "construct") {      my ($symb)=&Apache::lonnet::whichuser();
     $rndseed=$ENV{'form.rndseed'};      if ($env{'request.state'} eq "construct" 
     if (!$rndseed) {   || $symb eq '' 
       $rndseed=time;   || $Apache::lonhomework::type eq 'practice'
       $ENV{'form.rndseed'}=$rndseed;   || $Apache::lonhomework::history{'resource.CODE'}) {
     }   &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
     &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);   ['rndseed']);
   }   $rndseed=$env{'form.rndseed'};
   return $rndseed;   if (!$rndseed) {
       $rndseed=$Apache::lonhomework::history{'rndseed'};
       if (!$rndseed) {
    $rndseed=time;
       }
       $env{'form.rndseed'}=$rndseed;
    }
    if ( ($env{'form.resetdata'} eq &mt('New Problem Variation')
         && $env{'form.submitted'} eq 'yes')  ||
       $env{'form.newrandomization'} eq &mt('New Randomization')) {
       srand(time);
       $rndseed=int(rand(2100000000));
       $env{'form.rndseed'}=$rndseed;
       delete($env{'form.resetdata'});
       delete($env{'form.newrandomization'});
    }
    if (defined($rndseed) && $rndseed ne int($rndseed)) {
       $rndseed=join(':',&Apache::lonnet::digest($rndseed));
           }
           if ($Apache::lonhomework::history{'resource.CODE'}) {
      $rndseed=&Apache::lonnet::rndseed();
    }
    if ($safeeval) {
       &Apache::lonxml::debug("Setting rndseed to $rndseed");
       &Apache::run::run('$external::randomseed="'.$rndseed.'";',$safeeval);
    }
       }
       return $rndseed;
   }
   
   sub remember_problem_state {
       return '
          <input type="hidden" name="problemstate" value="'.$env{'form.problemstate'}.'" />
          <input type="hidden" name="problemtype" value="'.$env{'form.problemtype'}.'" />
          <input type="hidden" name="problemstatus" value="'.$env{'form.problemstatus'}.'" />';
 }  }
   
 sub problem_edit_header {  sub problem_edit_header {
   return '<input type="hidden" name="submitted" value="edit" />      return '<input type="hidden" name="submitted" value="edit" />'.
        <input type="hidden" name="problemmode" value="Edit" />   &Apache::structuretags::remember_problem_state().'
        <input type="submit" name="problemmode" value="Discard Edits and View" />  <div class="LC_edit_problem_header">
        <input type="submit" name="problemmode" value="EditXML" />  <div class="LC_edit_problem_header_title">
        <input type="submit" name="Undo" value="undo" /> <hr />  '.&mt('Problem Editing').&Apache::loncommon::help_open_menu('Problem Editing','Problem_Editor_XML_Index',5,'Authoring').'
        <input type="submit" name="submit" value="Submit Changes" />  </div>
        <input type="submit" name="submit" value="Submit Changes and View" /><br />  <div class="LC_edit_problem_discards">
       ';         <input type="hidden" name="problemmode" value="edit" />
          <input type="button" name="submitmode" accesskey="d" value="'.&mt('Discard Edits and View').'" '.
          ' onclick="javscript:setmode(this.form,'."'discard.'".')"  />
          <input '.&Apache::edit::submit_ask_anyway('setmode(this.form,'."'editxml'".')').' type="button" name="submitmode" accesskey="x" value="'.&mt('EditXML').'" />
          <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
   </div>
   <div class="LC_edit_problem_saves">
          <input type="submit" name="submitbutton" accesskey="s" value="'.&mt('Save and Edit').'" />
          <input type="submit" name="submitbutton" accesskey="v" value="'.&mt('Save and View').'" />
     </div>
   <hr class="LC_edit_problem_divide" />
   '.&Apache::lonxml::message_location().'
   </div>
   '.
          '<table border="0" width="100%"><tr><td bgcolor="#DDDDDD">';
 }  }
   
 sub problem_edit_footer {  sub problem_edit_footer {
   return '<br /><input type="submit" name="submit" value="Submit Changes and Edit" />      return '</td></tr></table><br />
     <input type="submit" name="submit" value="Submit Changes and View" />';  <div class="LC_edit_problem_footer">
     <hr class="LC_edit_problem_divide" />
     <div class="LC_edit_problem_discards">
        <input type="button" name="submitmode" accesskey="d" value="'.&mt('Discard Edits and View').'" '.
        'onclick=javascript:setmode(this.form,'."'discard'".')" />
        <input '.&Apache::edit::submit_ask_anyway('setmode(this.form,'."'editxml'".')').' type="button" name="submitmode" accesskey="x" value="'.&mt('EditXML').'" />
        <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
     </div>
     <div class="LC_edit_problem_saves">
       <input type="submit" name="submitbutton" value="'.&mt('Save and Edit').'" />
       <input type="submit" name="submitbutton" value="'.&mt('Save and View').'" />
     </div>
     <hr class="LC_edit_problem_divide" />
   </div>
   '.
   
       &Apache::lonhtmlcommon::htmlareaselectactive(&Apache::lonhtmlcommon::get_htmlareafields()).
       "\n</form>\n".&Apache::loncommon::end_page();
   }
   
   sub option {
       my ($value,$name) = @_;
       my $result ="<option value='".$value."' ";
       if ($env{'form.'.$name} eq $value) {
    $result.=" selected='on' ";
       }
       $result.='>';
       return $result;
 }  }
   
 sub problem_web_to_edit_header {  sub problem_web_to_edit_header {
   my ($rndseed)=@_;      my ($rndseed)=@_;
   my $result.='<input type="hidden" name="problemmode" value="View" />      my $result .= '<div class="LC_edit_problem_header">';
              <input type="submit" name="problemmode" value="Edit" />  
              <input type="submit" name="problemmode" value="EditXML" />      if (!$Apache::lonhomework::parsing_a_task) {
              Random Seed:<input type="text" name="rndseed" width="10" value="'.   $result .= 
        $rndseed.'" />      '<div class="LC_edit_problem_header_title">'.
              <input type="submit" name="changerandseed" value="Change" />      &mt('Problem Testing').
              <input type="submit" name="resetdata" value="Reset Submissions" />      &Apache::loncommon::help_open_topic('Problem_Editor_Testing_Area').
              <input type="checkbox" name="showallfoils" ';      '</div>';
   if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }      } else {
   $result.= ' /> Show All Foils   $result .= 
              <hr />';      '<div class="LC_edit_problem_header_title">'.
       &mt('Task Testing').
       '</div>';
       }
       
       my $show_all_foils_text = 
    ($Apache::lonhomework::parsing_a_task) ?
    &mt('&nbsp;Show&nbsp;All&nbsp;Instances')
    : &mt('&nbsp;Show&nbsp;All&nbsp;Foils');
   
       my $show_all= '<span class="LC_nobreak"><label><input type="checkbox" name="showallfoils" ';
       if (defined($env{'form.showallfoils'})) { $show_all.='checked="checked"'; }
       $show_all.= ' />'.$show_all_foils_text.'</label></span>';
   
   
   
       $result .= '<div class="LC_edit_problem_header_status_row">';
       if (!$Apache::lonhomework::parsing_a_task) {
    $result.="
   <div class='LC_edit_problem_header_row1'>
   <span class=\"LC_nobreak\">
   ".&mt("Problem Status:")."
   <select name='problemstate'>
     <option value=''></option>
     ".&option('CLOSED'               ,'problemstate').&mt("Closed")."</option>
     ".&option('CAN_ANSWER'           ,'problemstate').&mt("Answerable")."</option>
     ".&option('CANNOT_ANSWER_tries'  ,'problemstate').&mt("Open with full tries")."</option>
     ".&option('CANNOT_ANSWER_correct','problemstate').&mt("Open and correct")."</option>
     ".&option('SHOW_ANSWER'          ,'problemstate').&mt("Show Answer")."</option>
   </select>
   </span>
   <span class=\"LC_nobreak\">
   ".&mt("Problem Type:")."
   <select name='problemtype'>
     <option value=''></option>
     ".&option('exam'   ,'problemtype').&mt("Exam Problem")."</option>
     ".&option('problem','problemtype').&mt("Homework problem")."</option>
     ".&option('survey' ,'problemtype').&mt("Survey Question")."</option>
   </select>
   </span>
   $show_all
   </div>
   <div class='LC_edit_problem_header_row2'>
   <span class=\"LC_nobreak\">
   ".&mt("Feedback Mode:")."
   <select name='problemstatus'>
     <option value=''></option>
     ".&option('yes','problemstatus').&mt("Show Feedback")."</option>
     ".&option('no', 'problemstatus').&mt("Don't Show Incorect/Correct Feedback")."</option>
     ".&option('no_feedback_ever', 'problemstatus').&mt("Don't Show Any Feedback")."</option>
   </select>
   </span>
   ";
   
       } elsif ($Apache::lonhomework::parsing_a_task) {
    $result.="
   <div class='LC_edit_problem_header_row1'>
   <span class=\"LC_nobreak\">
   ".&mt("Problem Status:")."
   <select name='problemstate'>
     <option value=''></option>
     ".&option('CLOSED'               ,'problemstate').&mt("Closed")."</option>
     ".&option('CAN_ANSWER'           ,'problemstate').&mt("Answerable")."</option>
     ".&option('WEB_GRADE'            ,'problemstate').&mt("Criteria Grading")."</option>
     ".&option('SHOW_ANSWER'          ,'problemstate').&mt("Show Feedback")."</option>
   </select>
   </span>
   $show_all
   ";
       }
   
       $result.='
          <span class="LC_nobreak">
          '.&mt('Apply style file: ').'
            <input type="text" name="style_file" value="'.&HTML::Entities::encode($env{'construct.style'},'"<>&').'" />
            <a href="javascript:openbrowser(\'lonhomework\',\'style_file\',\'sty\')">'.&mt('Select').'</a>
          </span>
        </div>
        <input type="submit" name="changeproblemmode" value="'.&mt("Change View").'" />
        <input type="submit" name="clear_style_file" accesskey="d" value="'.&mt('Show Default View').'" />
        <input type="submit" name="resetdata" accesskey="r" value="'.&mt('Reset Submissions').'" />
      </div>
      <hr class="LC_edit_problem_divide" />
      <div class="LC_edit_problem_header_randomize_row">
        <input type="submit" name="newrandomization" accesskey="a" value="'.&mt('New Randomization').'" />
        <input type="submit" name="changerandseed" value="'.&mt('Change Random Seed To:').'" />
        <input type="text" name="rndseed" size="10" value="'.
          $rndseed.'"
                onchange="javascript:document.lonhomework.changerandseed.click()" />';
   
       if (!$Apache::lonhomework::parsing_a_task) {
    my $numtoanalyze=$env{'form.numtoanalyze'};
    if (!$numtoanalyze) { $numtoanalyze=20; }
    $result .= '<span class="LC_nobreak">'.
       &mt('[_1] for [_2] versions.',
    '<input type="button" name="submitmode" value="'.&mt('Calculate answers').'" '.
                   'onclick="javascript:setmode(this.form,'."'calcanswers'".')" />
    <input type="text" name="numtoanalyze" value="'.
    $numtoanalyze.'" size="5" />').
    &Apache::loncommon::help_open_topic("Analyze_Problem",'',undef,undef,300).
    '</span>';
       
       }
   
       $result.='
      </div>
      <div class="LC_edit_problem_header_edit_row">';
       $result.='<input type="hidden" name="problemmode" value="view" />';
       $result .= '<input type="button" name="submitmode" accesskey="e" value="'.&mt('Edit').'" '.
                  'onclick="javascript:setmode(this.form,'."'edit'".')" />';
       $result .= '<input type="button" name="submitmode" accesskey="x" value="'.&mt('EditXML').'" '.
                  'onclick="javascript:setmode(this.form,'."'editxml'".')" />';
       $result.='
      </div>
      '.&Apache::lonxml::message_location().'
   </div>';
       return $result;
 }  }
   
 sub initialize_storage {  sub initialize_storage {
   %Apache::lonhomework::results=();      my ($given_symb) = @_;
   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();      undef(%Apache::lonhomework::results);
   if ($ENV{'request.state'} eq 'construct') {      undef(%Apache::lonhomework::history);
     %Apache::lonhomework::history=      my ($symb,$courseid,$domain,$name) = 
       &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);   &Apache::lonnet::whichuser($given_symb);
       
       # anonymous users (CODEd exams) have no data
       if ($name eq 'anonymous' 
    && !defined($domain)) {
    return;
       }
   
       if ($env{'request.state'} eq 'construct' 
    || $symb eq ''
    || $Apache::lonhomework::type eq 'practice') {
   
    my $namespace = $symb || $env{'request.uri'};
    if ($env{'form.resetdata'} eq &mt('Reset Submissions') ||
       ($env{'form.resetdata'} eq &mt('New Problem Variation')
        && $env{'form.submitted'} eq 'yes') ||
       $env{'form.newrandomization'} eq &mt('New Randomization')) {
       &Apache::lonnet::tmpreset($namespace,'',$domain,$name);
       &Apache::lonxml::debug("Attempt reset");
    }
    %Apache::lonhomework::history=
       &Apache::lonnet::tmprestore($namespace,'',$domain,$name);
    my ($temp)=keys %Apache::lonhomework::history ;
    &Apache::lonxml::debug("Return message of $temp");
       } else {
    %Apache::lonhomework::history=
       &Apache::lonnet::restore($symb,$courseid,$domain,$name);
       }
   
       #ignore error conditions
     my ($temp)=keys %Apache::lonhomework::history ;      my ($temp)=keys %Apache::lonhomework::history ;
     &Apache::lonxml::debug("Return message of $temp");      if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
   } else {  
     %Apache::lonhomework::history=  
       &Apache::lonnet::restore($symb,$courseid,$domain,$name);  
   }  
   #ignore error conditions  
   my ($temp)=keys %Apache::lonhomework::history ;  
   if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }  
 }  }
   
 # -------------------------------------------------------------finalize_storage  # -------------------------------------------------------------finalize_storage
 # Stores away the result has to a student's environment  # Stores away the result has to a student's environment
 # checks form.grade_ for specific values, other wises stores  # checks form.grade_ for specific values, other wises stores
 # to the running users environment  # to the running users environment
   # Will increment totals for attempts, students, and corrects
   # if running user has student role.  
 sub finalize_storage {  sub finalize_storage {
   my $result;      my ($given_symb) = @_;
   my ($temp) = keys %Apache::lonhomework::results;      my $result;
   if ( $temp ne '' ) {      if (%Apache::lonhomework::results) {
     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();   my @remove = grep(/^INTERNAL_/,keys(%Apache::lonhomework::results));
     if ($ENV{'request.state'} eq 'construct') {   delete(@Apache::lonhomework::results{@remove});
       $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,   my ($symb,$courseid,$domain,$name) = 
       $ENV{'request.uri'},'',$domain,$name);      &Apache::lonnet::whichuser($given_symb);
       &Apache::lonxml::debug('Construct Store return message:'.$result);   if ($env{'request.state'} eq 'construct' 
       || $symb eq ''
       || $Apache::lonhomework::type eq 'practice') {
       my $namespace = $symb || $env{'request.uri'};
       $Apache::lonhomework::results{'rndseed'}=$env{'form.rndseed'};
       $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
         $namespace,'',$domain,$name);
       &Apache::lonxml::debug('Construct Store return message:'.$result);
    } else {
       $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
       $symb,$courseid,$domain,$name);
       &Apache::lonxml::debug('Store return message:'.$result);
               if ($env{'request.role'} =~/^st/) {
                   &store_aggregates($symb,$courseid);
               }
    }
     } else {      } else {
       $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,   &Apache::lonxml::debug('Nothing to store');
       $symb,$courseid,$domain,$name);      }
       &Apache::lonxml::debug('Store return message:'.$result);      return $result;
   }
   
   # -------------------------------------------------------------store_aggregates
   # Sends hash of values to be incremented in nohist_resourcetracker.db
   # for the course. Increments total number of attempts, unique students 
   # and corrects for each part for an instance of a problem, as appropriate.
   sub store_aggregates {
       my ($symb,$courseid) = @_;
       my %aggregate;
       my @parts;
       my $cdomain = $env{'course.'.$env{'request.course.id'}.'.domain'};
       my $cname = $env{'course.'.$env{'request.course.id'}.'.num'};
       foreach my $key (keys(%Apache::lonhomework::results)) {
           if ($key =~ /resource\.([^\.]+)\.tries/) {
               push(@parts, $1);
           }
       }
       foreach my $part (@parts) {
           if ($Apache::lonhomework::results{'resource.'.$part.'.award'}
       eq 'APPROX_ANS' ||
       $Apache::lonhomework::results{'resource.'.$part.'.award'}
       eq 'EXACT_ANS') {
               $aggregate{$symb."\0".$part."\0correct"} = 1;
           }
           if ($Apache::lonhomework::results{'resource.'.$part.'.tries'} == 1) {
               $aggregate{$symb."\0".$part."\0users"} = 1;
           } else {
               my (undef,$last_reset) = &Apache::grades::get_last_resets($symb,$env{'request.course.id'},[$part]); 
               if ($last_reset) {
                   if (&Apache::grades::get_num_tries(\%Apache::lonhomework::history,$last_reset,$part) == 0) {
                       $aggregate{$symb."\0".$part."\0users"} = 1;
                   }
               }
           }
           $aggregate{$symb."\0".$part."\0attempts"} = 1;
       }
       if (keys (%aggregate) > 0) {
    &Apache::lonnet::cinc('nohist_resourcetracker',\%aggregate,
                               $cdomain,$cname);
     }      }
   }  
   return $result;  
 }  }
   
 sub checkout_msg {  sub checkout_msg {
 return (<<ENDCHECKOUT);      my %lt=&Apache::lonlocal::texthash( 
 <h2>The resource needs to be checked out</h2>   'resource'=>'The resource needs to be checked out',
 As a resource gets checked out, a unique timestamped ID is given to it, and a   'id_expln'=>'As a resource gets checked out, a unique timestamped ID is given to it, and a permanent record is left in the system.',
 permanent record is left in the system.<p />                  'warning'=>'Checking out resources is subject to course policies, and may exclude future credit even if done erroneously.',
 <font color=red>                  'checkout'=>'Check out Exam for Viewing',
 Checking out resources is subject to course policies, and may exclude future   'checkout?'=>'Check out Exam?');
 credit even if done erroneously.<p />      my $uri = &Apache::lonenc::check_encrypt($env{'request.uri'});
       return (<<ENDCHECKOUT);
   <h2>$lt{'resource'}</h2>
       <p>$lt{'id_expln'}</p>
   <font color="red">
   <p>$lt{'warning'}</p>
 </font>  </font>
 <form name="checkout" method="POST" action="$ENV{'request.uri'}">  <form name="checkout" method="POST" action="$uri">
 <input type="hidden" name="doescheckout" value="yes" />  <input type="hidden" name="doescheckout" value="yes" />
 <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />  <input type="button" name="checkoutbutton" value="$lt{'checkout'}" onClick="javascript:if (confirm('$lt{'checkout?'}')) { document.checkout.submit(); }" />
 </form>  </form>
 ENDCHECKOUT  ENDCHECKOUT
 }  }
   
   sub firstaccess_msg {
       my ($time,$symb)=@_;
       my $result;
       my @interval=&Apache::lonnet::EXT("resource.0.interval");
       if ($interval[1] eq 'map') {
    my ($map)=&Apache::lonnet::decode_symb($symb);
    my $foldertitle=&Apache::lonnet::gettitle($map);
       
    &Apache::lonxml::debug("map is $map title is $foldertitle");
    $result .= "<h2>".&mt('The resources in "[_1]" are open for a limited time.'
                                .' Once you click the "Show Resource" button below you have [_2] to complete all resources "[_1]".'
                                ,$foldertitle,$time)."</h2>";
       } elsif ($interval[1] eq 'course') {
    my $course = $env{'course.'.$env{'request.course.id'}.'.description'};
           $result .= "<h2>".&mt('The resources in "[_1]" are open for a limited time.'
                                .' Once you click the "Show Resource" button below you have [_2] to complete all resources "[_1]".'
                                ,$course,$time)."</h2>";
       } else {
    my $title=&Apache::lonnet::gettitle($symb);
           $result .= "<h2>".&mt('This resource "[_1]" is open for a limited time.'
                                .' Once you click the "Show Resource" button below you have [_2] to complete this resource "[_1]".'
                                ,$title,$time)."</h2>";
       }
       my $uri = &Apache::lonenc::check_encrypt($env{'request.uri'});
       my $buttontext = &mt('Show Resource');
       my $timertext = &mt('Start Timer?');
       $result .= (<<ENDCHECKOUT);
   <form name="markaccess" method="POST" action="$uri">
   <input type="hidden" name="markaccess" value="yes" />
   <input type="button" name="accessbutton" value="$buttontext" onClick="javascript:if (confirm('$timertext')) { document.markaccess.submit(); }" />
   </form>
   ENDCHECKOUT
       return $result;
   }
   
   sub init_problem_globals {
       my ($type)=@_;
       #initialize globals
       #   For problems, we start out in part 0 (outside a <part> tag).
       #   and part 0 is used to describe the main body of the <problem>
       #
       if ($type eq 'problem') {
    $Apache::inputtags::part='0';
    @Apache::inputtags::partlist=('0');
    &Apache::lonhomework::set_show_problem_status(&get_problem_status('0'));
    $Apache::lonhomework::ignore_response_errors=0;
   
       } elsif ($type eq 'library') {
    $Apache::inputtags::part='';
    @Apache::inputtags::partlist=();
    &Apache::lonhomework::reset_show_problem_status();
    $Apache::lonhomework::ignore_response_errors=1;
   
       } elsif ($type eq 'Task') {
    $Apache::inputtags::part='0';
    @Apache::inputtags::partlist=('0');
    &Apache::lonhomework::reset_show_problem_status();
    $Apache::lonhomework::ignore_response_errors=1;
       }
       @Apache::inputtags::responselist = ();
       @Apache::inputtags::importlist = ();
       @Apache::inputtags::previous=();
       @Apache::inputtags::previous_version=();
       $Apache::structuretags::printanswer='No';
       @Apache::structuretags::whileconds=();
       @Apache::structuretags::whilebody=();
       @Apache::structuretags::whileline=();
       $Apache::lonhomework::scantronmode=0;
       undef($Apache::lonhomework::name);
       undef($Apache::lonhomework::default_type);
       undef($Apache::lonhomework::type);
   }
   
   sub reset_problem_globals {
       my ($type)=@_;
       undef(%Apache::lonhomework::history);
       undef(%Apache::lonhomework::results);
       undef($Apache::inputtags::part);
   #don't undef this, lonhomework.pm takes care of this, we use this to 
   #detect if we try to do 2 problems in one file
   #   undef($Apache::lonhomework::parsing_a_problem);
       undef($Apache::lonhomework::name);
       undef($Apache::lonhomework::default_type);
       undef($Apache::lonhomework::type);
       undef($Apache::lonhomework::scantronmode);
       undef($Apache::lonhomework::ignore_response_errors);
       &Apache::lonhomework::reset_show_problem_status();
   }
   
   sub set_problem_state {
       my ($part)=@_;
       if ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct') {
    $Apache::lonhomework::history{"resource.$part.solved"}=
       'correct_by_student';
       }
   }
   
   sub get_problem_status {
       my ($part)=@_;
       my $problem_status;
       if ($env{'request.state'} eq 'construct' &&
    defined($env{'form.problemstatus'})) {
    $problem_status=$env{'form.problemstatus'};
       } else {
    $problem_status=&Apache::lonnet::EXT("resource.$part.problemstatus");
    &Apache::lonxml::debug("problem status for $part is $problem_status");
    &Apache::lonxml::debug("env probstat is ".$env{'form.problemstatus'});
       }
       return $problem_status;
   }
   
 sub start_problem {  sub start_problem {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   
       # We'll use the redirection to fix up printing of duedates.
       if (!$Apache::lonxml::metamode) {
    &Apache::lonxml::startredirection();
       }
   
       # Problems don't nest and we don't allow more than one <problem> in
       # a .problem file.
       #
       if ( $Apache::inputtags::part ne '' ||
    $Apache::lonhomework::parsing_a_problem) {
    &Apache::lonxml::error('Only one &lt;problem&gt; allowed in a .problem file');
    #my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser,$style);
    return '';
       }
   
       $Apache::lonhomework::parsing_a_problem=1;
       &init_problem_globals('problem');
   
       if (defined($env{'scantron.maxquest'})) {
    $Apache::lonhomework::scantronmode=1;
       }
   
       if ($target ne 'analyze') {
           my $type = &Apache::lonnet::EXT('resource.0.type');
    $Apache::lonhomework::type=$type;
    if (($env{'request.state'} eq 'construct') &&
       $env{'form.problemtype'} =~ /\S/) {
       $Apache::lonhomework::type=$env{'form.problemtype'};
    }
    &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
       }
       if ($Apache::lonhomework::type eq '' ) {
    my $uri=$env{'request.uri'};
    if ($uri=~/\.(\w+)$/) {
       $Apache::lonhomework::type=$1;
       &Apache::lonxml::debug("Using type of $1");
    } else {
       $Apache::lonhomework::type='problem';
       &Apache::lonxml::debug("Using default type, problem, :$uri:");
    }
       }
       $Apache::lonhomework::default_type = $Apache::lonhomework::type;
   
   # meta is called from lonpublisher, which doesn't uses the normal  
   # lonhomework method of parsing the file which means that inputtags   
   # won't get reset  
   if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {  
     &Apache::lonxml::error('Only one problem allowed in a .problem file');  
     my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);  
     return '';  
   }  
 #intialize globals  
   $Apache::inputtags::part='0';  
   @Apache::inputtags::responselist = ();  
   @Apache::inputtags::previous=();  
   if ($target ne 'analyze') {  
     &initialize_storage();      &initialize_storage();
       if ($target ne 'analyze'
           && $env{'request.state'} eq 'construct') {
    &set_problem_state('0');
       }
   
     if ($target eq 'web') {      if ($target eq 'web') {
       &Apache::lonhomework::showhash(%Apache::lonhomework::history);   &Apache::lonxml::debug(" grading history ");
    &Apache::lonhomework::showhash(%Apache::lonhomework::history);
     }      }
     $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');  
     &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");      #added vars to the scripting enviroment
   }      my $expression='$external::part=\''.$Apache::inputtags::part.'\';';
   if ($Apache::lonhomework::type eq '') {      $expression.='$external::type=\''.$Apache::lonhomework::type.'\';';
     my $uri=$ENV{'request.uri'};      &Apache::run::run($expression,$safeeval);
     if ($uri=~/\.(\w+)$/) {      my $status;
       $Apache::lonhomework::type=$1;      my $accessmsg;
       &Apache::lonxml::debug("Using type of $1");  
       my $name= &get_resource_name($parstack,$safeeval);
       my ($result,$form_tag_start);
       if ($target eq 'web' || $target eq 'webgrade' || $target eq 'tex'
    || $target eq 'edit') {
    ($result,$form_tag_start) =
       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
    $name);
       }
   
       if ($target eq 'tex' and $env{'request.symb'} =~ m/\.page_/) {$result='';}
   
       if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
       if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
    $target eq 'tex') {
    #handle exam checkout
    if ($Apache::lonhomework::type eq 'exam') {
       my $token=
    $Apache::lonhomework::history{"resource.0.outtoken"};
       if (($env{'form.doescheckout'}) && (!$token)) {
    $token=&Apache::lonxml::maketoken();
    $Apache::lonhomework::history{"resource.0.outtoken"}=
       $token;
       }
       $result.=&Apache::lonxml::printtokenheader($target,$token);
    }
    if ($env{'form.markaccess'}) {
       my @interval=&Apache::lonnet::EXT("resource.0.interval");
       &Apache::lonnet::set_first_access($interval[1]);
    }
    #handle rand seed in construction space
    my $rndseed=&setup_rndseed($safeeval);
    my ($symb)=&Apache::lonnet::whichuser();
    if ($env{'request.state'} ne "construct" && 
       ($symb eq '' || $Apache::lonhomework::type eq 'practice')) {
       $form_tag_start.='<input type="hidden" name="rndseed" value="'.
    $rndseed.'" />'.
       '<input type="submit" name="resetdata"
                                value="'.&mt('New Problem Variation').'" />';
       if (exists($env{'form.username'})) {
    $form_tag_start.=
       '<input type="hidden" name="username"
                                value="'.$env{'form.username'}.'" />';
       }
       if ($env{'request.role.adv'}) {
    $form_tag_start.=
       ' <label><input type="checkbox" name="showallfoils" ';
    if (defined($env{'form.showallfoils'})) {
       $form_tag_start.='checked="on"';
    }
    $form_tag_start.= ' />'.&mt('&nbsp;Show&nbsp;All&nbsp;Foils').
       '</label>';
       }
               if ($Apache::lonhomework::type eq 'practice') {
                  $form_tag_start.='<span class="LC_info"><h3>'.&mt('Practice Problem').'</h3></span>'.
                                   '<span class="LC_info">'.&mt('Submissions are not permanently recorded').'</span>';
               }
       $form_tag_start.='<hr />';
    }
   
    ($status,$accessmsg,my $slot_name,my $slot) = 
       &Apache::lonhomework::check_slot_access('0','problem');
    push (@Apache::inputtags::status,$status);
   
    my $expression='$external::datestatus="'.$status.'";';
    $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
    &Apache::run::run($expression,$safeeval);
    &Apache::lonxml::debug("Got $status");
   
    if (( $status eq 'CLOSED' ) ||
       ( $status eq 'UNCHECKEDOUT') ||
       ( $status eq 'NOT_YET_VIEWED') ||
       ( $status eq 'BANNED') ||
       ( $status eq 'UNAVAILABLE') ||
       ( $status eq 'NOT_IN_A_SLOT') ||
       ( $status eq 'INVALID_ACCESS')) {
       my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser,
          $style);
       if ( $target eq "web" ) {
    my $msg;
    if ($status eq 'UNAVAILABLE') {
       $msg.='<h1>'.&mt('Unable to determine if this resource is open due to network problems. Please try again later.').'</h1>';
    } elsif ($status ne 'NOT_YET_VIEWED') {
       $msg.='<h1>'.&mt('Not open to be viewed').'</h1>';
    }
    if ($status eq 'CLOSED' || $status eq 'INVALID_ACCESS') {
       $msg.=&mt('The problem ').$accessmsg;
    } elsif ($status eq 'UNCHECKEDOUT') {
       $msg.=&checkout_msg();
    } elsif ($status eq 'NOT_YET_VIEWED') {
       $msg.=&firstaccess_msg($accessmsg,$symb);
    } elsif ($status eq 'NOT_IN_A_SLOT') {
       $msg.=&Apache::bridgetask::add_request_another_attempt_button("Sign up for time to work.");
    }
    $result.=$msg.'<br />';
       } elsif ($target eq 'tex') {
    my $startminipage = ($env{'form.problem_split'}=~/yes/i)? ''
                       : '\begin{minipage}{\textwidth}';
    $result.='\begin{document}\noindent \vskip 1 mm '.
       $startminipage.'\vskip 0 mm';
    if ($status eq 'UNAVAILABLE') {
       $result.=&mt('Unable to determine if this resource is open due to network problems. Please try again later.').'\vskip 0 mm ';
    } else {
       $result.=&mt('Problem is not open to be viewed. It')." $accessmsg \\vskip 0 mm ";
    }
       }
    } elsif ($status eq 'NEEDS_CHECKIN') {
       my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser,
          $style);
       if ($target eq 'web') {
    $result .= 
       &Apache::bridgetask::proctor_validation_screen($slot);
       } elsif ($target eq 'grade') {
    &Apache::bridgetask::proctor_check_auth($slot_name,$slot,
    'problem');
       }
    } elsif ($target eq 'web') {
       if ($status eq 'CAN_ANSWER' 
    && $slot_name ne ''
    && $Apache::lonhomework::history{'resource.0.checkedin'} eq '') {
    # unproctored slot access, self checkin
    &Apache::bridgetask::check_in('problem',undef,undef,
         $slot_name);
       }
       $result.="\n $form_tag_start \t".
         '<input type="hidden" name="submitted" value="yes" />';
       # create a page header and exit
       if ($env{'request.state'} eq "construct") {
    $result.= &problem_web_to_edit_header($env{'form.rndseed'});
       }
       # if we are viewing someone else preserve that info
       if (defined $env{'form.grade_symb'}) {
    foreach my $field ('symb','courseid','domain','username') {
       $result .= '<input type="hidden" name="grade_'.$field.
    '" value="'.$env{"form.grade_$field"}.'" />'."\n";
    }
       }
    } elsif ($target eq 'tex') {
       $result .= 'INSERTTEXFRONTMATTERHERE';
   
    }
       } elsif ($target eq 'edit') {
    $result .= $form_tag_start.&problem_edit_header();
    $Apache::lonxml::warnings_error_header=
       &mt("Editor Errors - these errors might not effect the running of the problem, but they will likely cause problems with further use of the Edit mode. Please use the EditXML mode to fix these errors.")."<br />";
    my $temp=&Apache::edit::insertlist($target,$token);
    $result.=$temp;
       } elsif ($target eq 'modified') {
    $result=$token->[4];
     } else {      } else {
       $Apache::lonhomework::type='problem';   # page_start returned a starting result, delete it if we don't need it
       &Apache::lonxml::debug("Using default type, problem, :$uri:");   $result = '';
     }      }
   }      return $result;
   }
   
   #added vars to the scripting enviroment  sub end_problem {
   my $expression='$external::part='.$Apache::inputtags::part.';';      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   &Apache::run::run($expression,$safeeval);      my $result;
   my $status;  
   my $accessmsg;      if (!$Apache::lonxml::metamode) {
    $result = &Apache::lonxml::endredirection(); #started in &start_problem
   #should get back a <html> or the neccesary stuff to start XML/MathML   $Apache::lonxml::post_evaluate=0;
   my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=      }
     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);  
   if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}      if ($target eq 'tex') {
    # Figure out the front matter and replace the
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {   # INSERTTEXFRONTMATTERHERE in result with it.  note that we do
     #handle exam checkout   # this in end_problem because whether or not we display due
     if ($Apache::lonhomework::type eq 'exam') {   # dates depends on whether due dates have already been
       my $token=$Apache::lonhomework::history{"resource.0.outtoken"};   # displayed in the problem parts.
       if (($ENV{'form.doescheckout'}) && (!$token)) {  
  $token=&Apache::lonxml::maketoken();   my $frontmatter   = '';
  $Apache::lonhomework::history{"resource.0.outtoken"}=$token;   my $startminipage = '';
       }   if (not $env{'form.problem_split'}=~/yes/) {
       $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);      $startminipage = '\begin{minipage}{\textwidth}';
     }  
   
     #handle rand seed in construction space  
     my $rndseed=&setup_rndseed($safeeval);  
     ($status,$accessmsg) = &Apache::lonhomework::check_access('0');  
     push (@Apache::inputtags::status,$status);  
     my $expression='$external::datestatus="'.$status.'";';  
     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';  
     &Apache::run::run($expression,$safeeval);  
     if (( $status eq 'CLOSED' ) ||  
         ( $status eq 'UNCHECKEDOUT') ||  
         ( $status eq 'BANNED')) {  
       my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);  
       if ( $target eq "web" ) {  
  $result.= $head_tag_start.'</head>';  
         my $msg=$body_tag_start.  
     '<h1>Not open to be viewed</h1>';  
         if ($status eq 'CLOSED') {  
     $msg.='The problem '.$accessmsg;  
  } elsif ($status eq 'UNCHECKEDOUT') {  
             $msg.=&checkout_msg;  
         }  
  $result.=$msg.'<br />';  
       }  
     } elsif ($target eq 'web') {  
       my $name= &get_resource_name($parstack,$safeeval);  
       if ($status eq 'CAN_ANSWER') {  
  # create a page header and exit  
  $result.="$head_tag_start<title>$name</title></head>  
               $body_tag_start \n $form_tag_start".  
  '<input type="hidden" name="submitted" value="yes" />';  
  if ($ENV{'request.state'} eq "construct") {  
   $result.= &problem_web_to_edit_header($rndseed);  
  }  
  # if we are viewing someone else preserve that info  
  if (defined $ENV{'form.grade_symb'}) {  
   foreach my $field ('symb','courseid','domain','username') {  
     $result .= '<input type="hidden" name="grade_'.$field.  
       '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";  
   }  
  }  
       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'  
        || $status eq 'CLOSED') {  
  $result.=$head_tag_start.  
   "<title>$name</title></head>\n$body_tag_start\n";  
       }  
     } elsif ($target eq 'tex') {  
  my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);  
  if ($name eq '') {   
     $name=&Apache::lonnet::EXT('resource.title');  
     if ($name eq 'con_lost') { $name = ''; }  
  }   }
  $Apache::lonhomework::name=$name;  
  my $id = $Apache::inputtags::part;   my $id = $Apache::inputtags::part;
  my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");    my $weight = &Apache::lonnet::EXT("resource.$id.weight");
  $duedate = POSIX::strftime("%c",localtime($duedate));   my $packages=&Apache::lonnet::metadata($env{'request.uri'},'packages');
    my @packages = split /,/,$packages;
    my $allow_print_points = 0;
    foreach my $partial_key (@packages) {
       if ($partial_key=~m/^part_0$/) {
    $allow_print_points=1;
       }
    }
    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
    if (defined($maxtries) && $maxtries < 0) { $allow_print_points=0; }
    if (lc($env{'course.'.$env{'request.course.id'}.
    '.disableexampointprint'}) eq 'yes') {
       $allow_print_points=0;
    }
    my $name_of_resourse= &Apache::lonxml::latex_special_symbols(&get_resource_name($parstack,$safeeval),'header');
    my $begin_doc='\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$env{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent ';
    my $toc_line='\vskip 1 mm\noindent '.$startminipage.
       '\addcontentsline{toc}{subsection}{'.$name_of_resourse.'}';
   
    #  Figure out what the due date is and if we need to print
    #  it in the problem header.  We have been logging the
    #  last due date written to file. 
   
    my $duetime = &Apache::lonnet::EXT("resource.$id.duedate"); 
    my $duedate = POSIX::strftime("%c",localtime($duetime));
  my $temp_file;   my $temp_file;
  my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";   my $filename = "/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.due";
         if (-e $filename) {  
     $temp_file = Apache::File->new($filename);    # Figure out what the last printed due date is or set it
    # to the epoch if no duedates have been printed.
   
    my $due_file_content = 0;      #   If the file does not yet exist, time is the epoch.
    if (-e $filename) {
       $temp_file = Apache::File->new($filename);
       my @due_file      = <$temp_file>;
       $due_file_content = $due_file[$#due_file];
       chomp $due_file_content;
    } 
   
    # We display the due date iff it is not the same as the last
    # duedate in problem header ($due_file_content), and
    # none of our parts displayed a duedate.
    #
    my $parts_with_displayduedate;
    if (defined $Apache::outputtags::showonce{'displayduedate'}) {
       $parts_with_displayduedate = 
    scalar(@{$Apache::outputtags::showonce{'displayduedate'}});
  } else {   } else {
     $temp_file = Apache::File->new('>>'.$filename);       $parts_with_displayduedate = 0;
  }   }
  my @due_file_content = <$temp_file>;   if (($due_file_content != $duetime) && ($parts_with_displayduedate == 0) ) {
  my $due_file_content = $due_file_content[$#due_file_content];      $temp_file = Apache::File->new('>'.$filename);
         chomp $due_file_content;      print $temp_file "$duetime\n";
         if ($due_file_content ne $duedate) {          if (not $env{'request.symb'} =~ m/\.page_/) {
  $temp_file = Apache::File->new('>'.$filename);    if(not $duedate=~m/1969/ and $Apache::lonhomework::type ne 'exam') {
     print $temp_file "$duedate\n";          $frontmatter .= $begin_doc.
     if (not $ENV{'request.symb'} =~ m/\.page_/) {   '\textit{Due date: '.$duedate.'} '.$toc_line;
  if(not $duedate=~m/1969/) {  
     $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm';  
  } else {   } else {
     $result .= '\begin{document} \noindent \vskip 1 mm';      $frontmatter.= $begin_doc.$toc_line;
       if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { $frontmatter .= '\fbox{\textit{'.$weight.' pt}}';}
  }   }
     } else {      } else {
  $result .= '\parbox{\minipagewidth}{\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';   $frontmatter .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\'.$startminipage;
     }       }
  } else {   } else {
     if (not $ENV{'request.symb'} =~ m/\.page_/) {      if (not $env{'request.symb'} =~ m/\.page_/) {
  $result .= '\begin{document} \noindent \vskip 1 mm';   $frontmatter .= $begin_doc.$toc_line;
    if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { $frontmatter .= '\fbox{\textit{'.$weight.' pt}}';}
     } else {      } else {
  $result .= '\parbox{\minipagewidth}{\vskip 1mm \\\\\\\\';   $frontmatter .= '\vskip 1mm \\\\\\\\'.$startminipage;
     }       }
  }   }
    $result =~ s/INSERTTEXFRONTMATTERHERE/$frontmatter/;
     }      }
   } elsif ($target eq 'edit') {  
     $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.  
       &problem_edit_header();  
     my $temp=&Apache::edit::insertlist($target,$token);  
     $result.=$temp;  
   } elsif ($target eq 'modified') {  
     $result=$token->[4];  
     $result.=&Apache::edit::handle_insert();  
   } else {  
     # page_start returned a starting result, delete it if we don't need it  
     $result = '';  
   }  
   return $result;  
 }  
   
 sub end_problem {      my $status=$Apache::inputtags::status['-1'];
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
   my $result='';   $target eq 'tex') {
   my $status=$Apache::inputtags::status['-1'];   if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
   if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {      # if part is zero, no <part>s existed, so we need to the grading
     if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {      if ($status eq 'CAN_ANSWER' ||$Apache::lonhomework::scantronmode) {
       # if part is zero, no <part>s existed, so we need to the grading   &Apache::inputtags::grade;
       &Apache::inputtags::grade;      } elsif ($status eq 'NEEDS_CHECKIN') {
     } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&    # no need to grade, and don't want to hide data
       $status ne 'UNCHECKEDOUT') {      } else {
       # if part is zero, no <part>s existed, so we need show the current    # move any submission data to .hidden
       # grading status   &Apache::inputtags::hidealldata($Apache::inputtags::part);
       my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part);      }
       #FIXME this is ugly we should just generate tex in inputtags   } elsif ( ($target eq 'web' || $target eq 'tex') &&
       if ($target eq 'tex') { $gradestatus=&html_to_tex($gradestatus); }    $Apache::inputtags::part eq '0' &&
       $result.= $gradestatus;    $status ne 'UNCHECKEDOUT' && $status ne 'NOT_YET_VIEWED') {
     }      # if part is zero, no <part>s existed, so we need show the current
     if (      # grading status
  (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||      my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
  ($target eq 'answer') || ($target eq 'tex')      $result.= $gradestatus;
        ) {   }
       if ($status eq 'CAN_ANSWER') {   if (
   if ($target ne 'tex') {      (($target eq 'web') && ($env{'request.state'} ne 'construct')) ||
       $result.="</form></body>\n";      ($target eq 'answer') || ($target eq 'tex')
   }      ) {
       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||      if ($target ne 'tex' &&
        $status eq 'UNCHECKEDOUT' ) {   $env{'form.answer_output_mode'} ne 'tex') {
   if ($target ne 'tex') {   $result.="</form>";
       $result.="</body>\n";   $result.= &Apache::lonhtmlcommon::htmlareaselectactive(&Apache::lonhtmlcommon::get_htmlareafields());
   }      }
       }      if ($target eq 'web') {
       if ($target ne 'tex') {   $result.= &Apache::loncommon::end_page({'discussion' => 1});
   $result.=&Apache::lonxml::xmlend();      } elsif ($target eq 'tex') {
       } else {   my $endminipage = '';
       $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';   if (not $env{'form.problem_split'}=~/yes/) {
       if (not $ENV{'request.symb'} =~ m/\.page_/) {      $endminipage = '\end{minipage}';
   $result .= '\end{document} ';   }
       } else {                  if ($env{'form.print_discussions'} eq 'yes') {
   $result .= '} ';      $result.=&Apache::lonxml::xmlend($target,$parser);
       }   } else {
       }      $result .= '\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
     }      if (not $env{'request.symb'} =~ m/\.page_/) {
     if ($target eq 'grade') {    $result .= $endminipage.'\end{document} ';
       &Apache::lonhomework::showhash(%Apache::lonhomework::results);      } else {
       &finalize_storage();   $result .= $endminipage;
     }      }
   } elsif ($target eq 'meta') {   }
     if ($Apache::inputtags::part eq '0') {      }
       $result=&Apache::response::mandatory_part_meta;   }
     }   if ($target eq 'grade') {
   } elsif ($target eq 'edit') {      &Apache::lonhomework::showhash(%Apache::lonhomework::results);
     &Apache::lonxml::debug("in end_problem with $target, edit");      &finalize_storage();
     $result = &problem_edit_footer();   }
   }    if ($target eq 'answer' && ($env{'request.state'} eq 'construct')
   return $result;      && $env{'form.answer_output_mode'} ne 'tex') {
 }      $result.=&Apache::loncommon::end_page({'discussion' => 1});
                           # normally we get it from above, but in CSTR
 #FIXME I am ugly shoot me                          # we always show answer mode too.
 sub html_to_tex {   }
   my ($string)=@_;      } elsif ($target eq 'meta') {
   $string =~ s/<table>//;   if ($Apache::inputtags::part eq '0') {
   $string =~ s/<\/table>//;      @Apache::inputtags::response=();
   $string =~ s/<tr([^>]*)>//g;      $result=&Apache::response::mandatory_part_meta;
   $string =~ s/<\/tr>//g;   }
   $string =~ s/<td([^>]*)>//g;   $result.=&Apache::response::meta_part_order();
   $string =~ s/<\/td>//g;   $result.=&Apache::response::meta_response_order();
   $string =~ s/<b>/\\textbf{/g;      } elsif ($target eq 'edit') {
   $string =~ s/<\/b>/}/g;   &Apache::lonxml::debug("in end_problem with $target, edit");
   $string =~ s/<br \/>/\\vskip 0 mm /g;   $result .= &problem_edit_footer();
   $string =~ s/<input([^>]*)>//g;      } elsif ($target eq 'modified') {
   return $string;   $result .= $token->[2];
       }
   
       if ($env{'request.state'} eq 'construct' && $target eq 'web') {
    &Apache::inputtags::check_for_duplicate_ids();
       }
   
       &reset_problem_globals('problem');
   
       return $result;
 }  }
   
 sub start_library {  
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;  
   my ($result,$head_tag_start,$body_tag_start,$form_tag_start);  
   
   if ($target eq 'edit') {  sub start_library {
     ($result,$head_tag_start,$body_tag_start,$form_tag_start)=      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);      my ($result,$form_tag_start);
     $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.      if ($#$tagstack eq 0 && $$tagstack[0] eq 'library') {
       &problem_edit_header();   &init_problem_globals('library');
     my $temp=&Apache::edit::insertlist($target,$token);   $Apache::lonhomework::type='problem';
     $result.=$temp;      }
   } elsif ($target eq 'modified') {      if ($target eq 'edit') {
     $result=$token->[4];   ($result,$form_tag_start)=
     $result.=&Apache::edit::handle_insert();      &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
   } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&   'Edit');
    $ENV{'request.state'} eq "construct" ) {   $result.=$form_tag_start.&problem_edit_header();
     ($result,$head_tag_start,$body_tag_start,$form_tag_start)=   my $temp=&Apache::edit::insertlist($target,$token);
       &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);   $result.=$temp;
     my $name=&get_resource_name($parstack,$safeeval);      } elsif ($target eq 'modified') {
     my $rndseed=&setup_rndseed($safeeval);   $result=$token->[4];
     $result.="$head_tag_start<title>$name</title></head>      } elsif (($target eq 'web' || $target eq 'webgrade')
               $body_tag_start \n $form_tag_start".       && ($#$tagstack eq 0 && $$tagstack[0] eq 'library')
  '<input type="hidden" name="submitted" value="yes" />';       && $env{'request.state'} eq "construct" ) {
     $result.=&problem_web_to_edit_header($rndseed);   my $name=&get_resource_name($parstack,$safeeval);
   }   ($result,$form_tag_start)=
   return $result;      &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval,
    $name);
    my $rndseed=&setup_rndseed($safeeval);
    $result.=" \n $form_tag_start".
     '<input type="hidden" name="submitted" value="yes" />';
    $result.=&problem_web_to_edit_header($rndseed);
       }
       return $result;
 }  }
   
 sub end_library {  sub end_library {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result='';      my $result='';
   if ($target eq 'edit') {      if ($target eq 'edit') {
     $result=&problem_edit_footer();   $result=&problem_edit_footer();
   } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&      } elsif ($target eq 'web' 
    $ENV{'request.state'} eq "construct") {       && ($#$tagstack eq 0 && $$tagstack[0] eq 'library') 
     $result.='</form></body>'.&Apache::lonxml::xmlend();       && $env{'request.state'} eq "construct") {
   }   $result.='</form>'.&Apache::loncommon::end_page({'discussion' => 1});
   return $result;      }
       if ( $#$tagstack eq 0 && $$tagstack[0] eq 'library') {
    &reset_problem_globals('library');
       }
       return $result;
   }
   
   sub start_definetag {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   
       my $result;
   
       my $name = $token->[2]->{'name'};
       my $skip=&Apache::lonxml::get_all_text("/definetag",$parser,$style);
       if ($target eq 'web') {
    if ($name=~/^\//) {
       $result=
    '<br /><table class="LC_sty_end"><tr><th>'.
    &mt('END [_1]'.'<tt>'.$name.'</tt>').'</th></tr>';
    } else {
       $result=
    '<br /><table class="LC_sty_begin"><tr><th>'.
    &mt('BEGIN [_1]'.'<tt>'.$name.'</tt>').'</th></tr>';
    }
    $skip = &HTML::Entities::encode($skip, '<>&"');
    $result.='<tr><td><pre>'.$skip.'</pre></td></tr></table>';
       }
       return $result;
   }
   
   sub end_definetag {
       return '';
 }  }
   
 sub start_block {  sub start_block {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {      my $result;
     my $code = @$parstack[$#$parstack];  
     $code =~ s/\"//g;      if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer'  ||
     $code .=';return $condition;';   $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
     #  print "<br />$code<br />";   my $code = $token->[2]->{'condition'};
     my $result = &Apache::run::run($code,$safeeval);   if (defined($code) && $code ne '') {
     &Apache::lonxml::debug("block :$code: returned :$result:");      if (!$Apache::lonxml::default_homework_loaded) {
     if ( ! $result ) {    &Apache::lonxml::default_homework_load($safeeval);
       my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);      }
       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");      $result = &Apache::run::run($code,$safeeval);
       &Apache::lonxml::debug("block :$code: returned :$result:");
    } else {
       $result='1';
    }
    if ( ! $result ) {
       my $skip=&Apache::lonxml::get_all_text("/block",$parser,$style);
       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
    }
    $result='';
       } elsif ($target eq 'edit') {
    $result .=&Apache::edit::tag_start($target,$token);
    $result .=&Apache::edit::text_arg('Test Condition:','condition',
     $token,40);
    $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'condition');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
     }      }
   }      return $result;
   return "";  
 }  }
   
 sub end_block {  sub end_block {
   return '';      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       if ($target eq "edit") {
    $result.= &Apache::edit::tag_end($target,$token,'');
       }
       return $result;
   }
   
   sub start_languageblock {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   
       my $result;
   
       if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
    $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
    my $include = $token->[2]->{'include'};
    my $exclude = $token->[2]->{'exclude'};
           my @preferred_languages=&Apache::loncommon::preferred_languages();
   # This should not even happen, since we should at least have the server language
           if (!$preferred_languages[0]) { $preferred_languages[0]='en'; }
   # Now loop over all languages in order of preference
           foreach my $preferred_language (@preferred_languages) {
   # If the languageblock has no arguments, show the contents
              $result=1;
              my $found=0;
   # Do we have an include argument?
      if ($include) {
   # If include is specified, by default, don't render the block
                 $result=0;
                 foreach my $included_language (split(/\,/,$include)) {
   # ... but if my preferred language is included, render it
                    if ($included_language eq $preferred_language) {
                       $result=1; 
                       $found=1; 
                    }
                 }
      }
   # Do we have an exclude argument?
              if ($exclude) {
                 $result=1;
                 foreach my $excluded_language (split(/\,/,$exclude)) {
                    if ($excluded_language eq $preferred_language) {
                       $result=0;
                       $found=1;
                    }
                 }
      }
              if ($found) { last; }
           }
    if ( ! $result ) {
       my $skip=&Apache::lonxml::get_all_text("/languageblock",$parser,
      $style);
       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
    }
    $result='';
       } elsif ($target eq 'edit') {
    $result .=&Apache::edit::tag_start($target,$token);
    $result .=&Apache::edit::text_arg(&mt('Include Language:'),'include',
     $token,40);
    $result .=&Apache::edit::text_arg(&mt('Exclude Language:'),'exclude',
     $token,40);
    $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'include',
        'exclude');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
       }
       return $result;
   }
   
   sub end_languageblock {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       if ($target eq "edit") {
    $result.= &Apache::edit::tag_end($target,$token,'');
       }
       return $result;
   }
   
   {
       my %available_texts;
       sub start_translated {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    &Apache::lonxml::register('Apache::structuretags',('lang'));
    undef(%available_texts);
       }
       
       sub end_translated {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    my $result;
    #show the translation on viewable targets
    if ($target eq 'web'     || $target eq 'tex' || $target eq 'webgrade'||
       # or non-viewable targets, if it's embedded in something that
       # wants the output
       (($target eq 'answer' || $target eq 'analyze'|| $target eq 'grade')
        && &Apache::lonxml::in_redirection() ) ) {
       my @possibilities = keys(%available_texts);
       my $which = 
    &Apache::loncommon::languages(\@possibilities) || 'default';
       $result = $available_texts{$which};
    }
    undef(%available_texts);
    &Apache::lonxml::deregister('Apache::structuretags',('lang'));
    return $result;
       }
   
   
       sub start_lang {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
       $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
       &Apache::lonxml::startredirection();
    }
    return '';
       }
   
       sub end_lang {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
    if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
       $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
       my $result = &Apache::lonxml::endredirection();
       my $which = &Apache::lonxml::get_param('which',$parstack,
      $safeeval);
       $available_texts{$which} = $result;
    }
    return '';
       }
   }
   
   sub start_instructorcomment {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   
       my $result;
   
       if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
    $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
           $result=($env{'request.role'}=~/^(in|cc|au|ca|li)/);
    if ( (! $result) or ($env{'form.instructor_comments'} eq 'hide')) {
       my $skip=&Apache::lonxml::get_all_text("/instructorcomment",
      $parser,$style);
       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
    }
    $result='';
       } elsif ($target eq 'edit') {
    $result .=&Apache::edit::tag_start($target,$token);
    $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       }
       return $result;
   }
   
   sub end_instructorcomment {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       if ($target eq "edit") {
    $result.= &Apache::edit::tag_end($target,$token,'');
       }
       return $result;
 }  }
   
 sub start_while {  sub start_while {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   
   my $code = @$parstack[$#$parstack];      my $result;
   $code =~ s/\"//g;      if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
   $code .=';return $condition;';   $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
    my $code = $token->[2]->{'condition'};
   push( @Apache::structuretags::whileconds, $code);   
   my $result = &Apache::run::run($code,$safeeval);   push( @Apache::structuretags::whileconds, $code);
   my $bodytext=$$parser[$#$parser]->get_text("/while");   if (!$Apache::lonxml::default_homework_loaded) {
   push( @Apache::structuretags::whilebody, $bodytext);      &Apache::lonxml::default_homework_load($safeeval);
   if ( $result ) {    }
     &Apache::lonxml::newparser($parser,\$bodytext);   my $result = &Apache::run::run($code,$safeeval);
   }   my $bodytext=&Apache::lonxml::get_all_text("/while",$parser,$style);
   return "";   push( @Apache::structuretags::whilebody, $bodytext);
    push( @Apache::structuretags::whileline, $token->[5]);
    &Apache::lonxml::debug("s code $code got -$result-");
    if ( $result ) {
       &Apache::lonxml::newparser($parser,\$bodytext);
    }
       } elsif ($target eq 'edit') {
    $result .=&Apache::edit::tag_start($target,$token);
    $result .=&Apache::edit::text_arg(&mt('Test Condition:'),'condition',
     $token,40);
    $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'condition');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
       }
       return $result;
 }  }
   
 sub end_while {  sub end_while {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $code = pop @Apache::structuretags::whileconds;      my $result;
   my $bodytext = pop @Apache::structuretags::whilebody;  
   my $result = &Apache::run::run($code,$safeeval);      if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
   if ( $result ) {    $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
     &Apache::lonxml::newparser($parser,\$bodytext);   my $code = pop(@Apache::structuretags::whileconds);
   }    my $bodytext = pop(@Apache::structuretags::whilebody);
   return "";   my $line = pop(@Apache::structuretags::whileline);
    my $return = &Apache::run::run($code,$safeeval);
    my $starttime=time;
    my $error=0;
    while ($return) {
       if (time-$starttime >
    $Apache::lonnet::perlvar{'lonScriptTimeout'}) {
    $return = 0; $error=1; next;
       }
       $result.=&Apache::scripttag::xmlparse($bodytext);
       if ($target eq 'grade' || $target eq 'answer' ||
    $target eq 'analyze') {
    # grade/answer/analyze should produce no output but if we
    # are redirecting, the redirecter should know what to do
    # with the output
    if (!$Apache::lonxml::redirection) { undef($result); }
       }
       $return = &Apache::run::run($code,$safeeval);
    }
    if ($error) {
       &Apache::lonxml::error('<pre>'.&mt('Code ran too long. It ran for more than').' '.$Apache::lonnet::perlvar{'lonScriptTimeout'}.' '.&mt('seconds occured while running &lt;while&gt; on line').' '.$line.'</pre>');
    }
       } elsif ($target eq "edit") {
    $result.= &Apache::edit::tag_end($target,$token,'');
       }
       return $result;
 }  }
   
 # <randomlist show="1">   # <randomlist show="1">
 #  <tag1>..</tag1>  #  <tag1>..</tag1>
 #  <tag2>..</tag2>  #  <tag2>..</tag2>
 #  <tag3>..</tag3>  #  <tag3>..</tag3>
 #  ...   #  ...
 # </randomlist>  # </randomlist>
 sub start_randomlist {  sub start_randomlist {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result;      my $result;
   if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||      if ($target eq 'answer' || $target eq 'grade'   || $target eq 'web' ||
       $target eq 'tex') {   $target eq 'tex'    || $target eq 'analyze' || $target eq 'webgrade') {
     my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);   my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
     my $b_parser= HTML::TokeParser->new(\$body);   my $b_parser= HTML::LCParser->new(\$body);
     my $b_tok;   $b_parser->xml_mode(1);
     my @randomlist;   $b_parser->marked_sections(1);
     my $list_item;   my $b_tok;
     while($b_tok = $b_parser->get_token() ) {   my @randomlist;
       if($b_tok->[0] eq 'S') { # start tag   my $list_item;
  # get content of the tag until matching end tag   while($b_tok = $b_parser->get_token() ) {
  # get all text upto the matching tag      if($b_tok->[0] eq 'S') { # start tag
  # and push the content into @randomlist   # get content of the tag until matching end tag
  $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);   # get all text upto the matching tag
  $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";   # and push the content into @randomlist
  push(@randomlist,$list_item);   $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],
  #  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";     $b_parser);
       }   $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
       if($b_tok->[0] eq 'T') { # text   push(@randomlist,$list_item);
  # what to do with text in between tags?   #  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4],
  #  print "<b>TEXT $b_tok->[1]</b><br />";                  #         $list_item</b>";
       }      }
       # if($b_tok->[0] eq 'E') { # end tag, should not happen      if($b_tok->[0] eq 'T') { # text
       #  print "<b>END-TAG $b_tok->[1]</b><br />";   # what to do with text in between tags?
       # }   #  print "<b>TEXT $b_tok->[1]</b><br />";
     }      }
     my @idx_arr = (0 .. $#randomlist);      # if($b_tok->[0] eq 'E') { # end tag, should not happen
     &Apache::structuretags::shuffle(\@idx_arr);      #  print "<b>END-TAG $b_tok->[1]</b><br />";
     my $bodytext = '';      # }
     my $show=$#randomlist;   }
     my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);   if (@randomlist) {
     $showarg--;      my @idx_arr = (0 .. $#randomlist);
     if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }      &Apache::structuretags::shuffle(\@idx_arr);
     for(0 .. $show) {      my $bodytext = '';
       $bodytext .= "$randomlist[ $idx_arr[$_] ]";      my $show=$#randomlist;
     }      my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
     &Apache::lonxml::newparser($parser,\$bodytext);      $showarg--;
   } elsif ($target eq 'edit' ) {      if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
     $result .= &Apache::edit::tag_start($target,$token);      for(0 .. $show) {
     $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);   $bodytext .= "$randomlist[ $idx_arr[$_] ]";
     $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();      }
   } elsif ($target eq 'modified' ) {      &Apache::lonxml::newparser($parser,\$bodytext);
     my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,   }
  'show');      } elsif ($target eq 'edit' ) {
     if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }   $result .=&Apache::edit::tag_start($target,$token);
   }   $result .=&Apache::edit::text_arg('Maximum Tags to Show:','show',
   return $result;     $token,5);
    $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified' ) {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'show');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
       }
       return $result;
 }  }
   
 sub shuffle {  sub shuffle {
     my $a=shift;      my $a=shift;
     my $i;      my $i;
     if (defined(@$a)) {      if (ref($a) eq 'ARRAY' && @$a) {
       &Apache::response::setrandomnumber();   &Apache::response::pushrandomnumber();
       for($i=@$a;--$i;) {   for($i=@$a;--$i;) {
  my $j=int rand($i+1);      my $j=int(&Math::Random::random_uniform() * ($i+1));
  next if $i == $j;      next if $i == $j;
  @$a[$i,$j] = @$a[$j,$i];      @$a[$i,$j] = @$a[$j,$i];
       }   }
    &Apache::response::poprandomnumber();
     }      }
 }  }
   
 sub end_randomlist {  sub end_randomlist {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result;      my $result;
   if ($target eq 'edit' ) {      if ($target eq 'edit' ) {
     $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');   $result=&Apache::edit::tag_end($target,$token,
   }         'End Randomly Parsed Block');
   return $result;      }
       return $result;
   }
   
   sub ordered_show_check {
       my $last_part=$Apache::inputtags::partlist[-2];
       my $in_order=
    &Apache::lonnet::EXT('resource.'.$Apache::inputtags::part.'.ordered');
       my $in_order_show=1;
       if ($last_part ne '0' && lc($in_order) eq 'yes') {
    $in_order_show=&Apache::response::check_status($last_part);
       }
       return $in_order_show;
 }  }
   
 sub start_part {  sub start_part {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';      if (!$Apache::lonxml::metamode) {
   my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);   &Apache::lonxml::startredirection(); # we'll use redirection to fix up 
   if ($id eq '') { $id = $Apache::lonxml::curdepth; }                                       # duedates.
   $Apache::inputtags::part=$id;      }
   @Apache::inputtags::responselist = ();      my $result='';
   @Apache::inputtags::previous=();      my $id= &Apache::lonxml::get_id($parstack,$safeeval);
   if ($target eq 'meta') {      $Apache::inputtags::part=$id;
     return &Apache::response::mandatory_part_meta;      push(@Apache::inputtags::partlist,$id);
   } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {      @Apache::inputtags::response=();
     my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);      @Apache::inputtags::previous=();
     push (@Apache::inputtags::status,$status);      @Apache::inputtags::previous_version=();
     my $expression='$external::datestatus="'.$status.'";';      &Apache::lonhomework::set_show_problem_status(&get_problem_status($id));
     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';      &Apache::response::reset_params();
   
       my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
       my $newtype=&Apache::lonnet::EXT("resource.$id.type");
       if ($newtype) { $Apache::lonhomework::type=$newtype; }
       my $in_order_show=&ordered_show_check();
       my $expression='$external::part=\''.$Apache::inputtags::part.'\';';
       $expression.='$external::type=\''.$Apache::lonhomework::type.'\';';
     &Apache::run::run($expression,$safeeval);      &Apache::run::run($expression,$safeeval);
     if ( $status eq 'CLOSED' ) {  
       my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);      if ($target eq 'meta') {
       if ( $target eq "web" ) {   my $display=&Apache::lonxml::get_param('display',$parstack,$safeeval);
  $result="<br />Part is not open to be viewed. It $accessmsg<br />";   return &Apache::response::mandatory_part_meta.
       } elsif ( $target eq 'tex' ) {         &Apache::response::meta_parameter_write('display','string',$display,'Part Description');
  $result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";      } elsif ($target eq 'web' || $target eq 'grade' ||
       }       $target eq 'answer' || $target eq 'tex') {
     } else {   if ($hidden || !$in_order_show) {
       if ($target eq 'tex') {      my $bodytext=&Apache::lonxml::get_all_text("/part",$parser,$style);
  $result='\vskip 0 mm';   } else {
       }      my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
       push (@Apache::inputtags::status,$status);
       my $expression='$external::datestatus="'.$status.'";';
       $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
       &Apache::run::run($expression,$safeeval);
       if ($env{'request.state'} eq 'construct') {
    &set_problem_state($Apache::inputtags::part); 
       }
       if (( $status eq 'CLOSED' ) ||
    ( $status eq 'UNCHECKEDOUT') ||
    ( $status eq 'NOT_YET_VIEWED') ||
    ( $status eq 'BANNED') ||
    ( $status eq 'UNAVAILABLE') ||
    ( $status eq 'INVALID_ACCESS')) {
    my $bodytext=&Apache::lonxml::get_all_text("/part",$parser,
      $style);
    if ( $target eq "web" ) {
       $result="<br />".&mt('Part is not open to be viewed. It')." $accessmsg<br />";
    } elsif ( $target eq 'tex' ) {
       if (not $env{'form.problem_split'}=~/yes/) {
    $result="\\end{minipage}\\vskip 0 mm ".&mt('Part is not open to be viewed. It')." $accessmsg \\\\\\begin{minipage}{\\textwidth}";
       } else {
    $result="\\vskip 0 mm ".&mt('Part is not open to be viewed. It')." $accessmsg \\\\";
       }
    }
       } else {
    if ($target eq 'tex') {
       if (not $env{'form.problem_split'}=~/yes/) {
    if ($$tagstack[-2] eq 'td') {
       $result.='\noindent \begin{minipage}{\textwidth}\noindent';
    } else {
       $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
    }
       }
       my $weight = &Apache::lonnet::EXT("resource.$id.weight");
       my $allkeys=&Apache::lonnet::metadata($env{'request.uri'},'packages');
       my @allkeys = split /,/,$allkeys;
       my $allow_print_points = 0;
       foreach my $partial_key (@allkeys) {
    if ($partial_key=~m/^part_(.*)$/) {
       if ($1 ne '0') {$allow_print_points=1;}
    }
       }
       my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
       if (defined($maxtries) && $maxtries < 0) {
    $allow_print_points=0;
       }
       if (lc($env{'course.'.$env{'request.course.id'}.
       '.disableexampointprint'}) eq 'yes') {
    $allow_print_points=0;
       }
       if (($Apache::lonhomework::type eq 'exam') && ($allow_print_points)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
    } elsif ($target eq 'web') {
       $result.='<a name="'.&escape($Apache::inputtags::part).'" />';
    }
       }
    }
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::text_arg('Part ID:','id',$token).
       &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
       '&nbsp;&nbsp;'.
   &Apache::edit::text_arg('Displayed Part Description:','display',$token).
    &Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'id','display');
    if ($constructtag) {
       #limiting ids to only letters numbers, and space
       $token->[2]->{'id'}=~s/[^A-Za-z0-9 ]//gs;
       $result = &Apache::edit::rebuild_tag($token);
    }
     }      }
   }      return $result;
   return $result;  
 }  }
   
 sub end_part {  sub end_part {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   &Apache::lonxml::debug("in end_part $target ");      &Apache::lonxml::debug("in end_part $target ");
   my $status=$Apache::inputtags::status['-1'];      my $status=$Apache::inputtags::status['-1'];
   pop @Apache::inputtags::status;      my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
   if ( $target eq 'meta' ) { return ''; }      my $in_order_show=&ordered_show_check();
   if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {      my $result;
     return &Apache::inputtags::grade;      if (!$Apache::lonxml::metamode) {
   }   $result = &Apache::lonxml::endredirection(); # started in &start_part
   if ($target eq 'web' || $target eq 'tex' ) {   $Apache::lonxml::post_evaluate=0;
     my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part);      }
     #FIXME this is ugly we should just generate tex in inputtags      if ($target eq 'grade') {
     if ($target eq 'tex') { $gradestatus=&html_to_tex($gradestatus); }   if (($status eq 'CAN_ANSWER' || $Apache::lonhomework::scantronmode) &&
     return $gradestatus;      !$hidden && $in_order_show) {
   }      $result.=&Apache::inputtags::grade;
   return '';   } else {
       # move any submission data to .hidden
       &Apache::inputtags::hidealldata($Apache::inputtags::part);
    }
       } elsif (($target eq 'web' || $target eq 'tex') &&
        !$hidden && $in_order_show) {
    my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
    $target);
    if ($Apache::lonhomework::type eq 'exam' && $target eq 'tex') {
       $gradestatus='';
    }
    $result.=$gradestatus;
    if ($$tagstack[-2] eq 'td' and $target eq 'tex') {$result.='\end{minipage}';} 
       } elsif ($target eq 'edit') {
    $result.=&Apache::edit::end_table();
       } elsif ($target eq 'modified') {
    $result .= $token->[2];
       }
       pop @Apache::inputtags::status;
       $Apache::inputtags::part='';
       $Apache::lonhomework::type = $Apache::lonhomework::default_type;
       return $result;
 }  }
   
 sub start_preduedate {  sub start_preduedate {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {      if ($target eq 'web' || $target eq 'grade'    || $target eq 'answer' ||
     if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&   $target eq 'tex' || $target eq 'webgrade') {
  $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {   &Apache::lonxml::debug("State in preduedate is ". $Apache::inputtags::status['-1']);
       &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);   if (!$Apache::lonhomework::scantronmode &&
       $Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
       $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER') {
       &Apache::lonxml::debug("Wha? ". ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER'));
       &Apache::lonxml::get_all_text("/preduedate",$parser,$style);
    }
     }      }
   }      return '';
   return '';  
 }  }
   
 sub end_preduedate {  sub end_preduedate {
   return '';      return '';
 }  }
   
   # In all the modes where <postanswerdate> text is 
   # displayable,  all we do is eat up the text between the start/stop
   # tags if the conditions are not right to display it.
 sub start_postanswerdate {  sub start_postanswerdate {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {      my $pav = &Apache::lonnet::allowed('pav', $env{'request.course.id'}) ||
     if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {   &Apache::lonnet::allowed('pav',
       &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);     $env{'request.course.id'}.'/'.$env{'request.course.sec'});
     }      if ($target eq 'web' || $target eq 'grade' || $target eq 'webgrade' ||
   } elsif ($target eq 'tex') {   $target eq 'tex' ) {
       return '\vskip 0 mm \noindent';   if ($Apache::lonhomework::scantronmode ||
   }      $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER' ||
   return '';      (($target eq 'tex') && !$pav)) {
       &Apache::lonxml::get_all_text("/postanswerdate",$parser,$style);
    }
       }
       return '';
 }  }
   
 sub end_postanswerdate {  sub end_postanswerdate {
   return '';      return '';
 }  }
   
 sub start_notsolved {  sub start_notsolved {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};   $target eq 'tex' || $target eq 'webgrade') {
     &Apache::lonxml::debug("not solved has :$gradestatus:");   my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
     if ($gradestatus =~ /^correct/) {   &Apache::lonxml::debug("not solved has :$gradestatus:");
       &Apache::lonxml::debug("skipping");   if ($gradestatus =~ /^correct/ &&
       &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);      &Apache::response::show_answer()) {
       &Apache::lonxml::debug("skipping");
       &Apache::lonxml::get_all_text("/notsolved",$parser,$style);
    }
     }      }
   }      return '';
   return '';  
 }  }
   
 sub end_notsolved {  sub end_notsolved {
   return '';      return '';
 }  }
   
 sub start_solved {  sub start_solved {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};   $target eq 'tex') {
     if ($gradestatus !~ /^correct/) {   my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
       &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);   if ($gradestatus !~ /^correct/ ||
       !&Apache::response::show_answer()) {
       &Apache::lonxml::get_all_text("/solved",$parser,$style);
    }
     }      }
   }      return '';
   return '';  
 }  }
   
 sub end_solved {  sub end_solved {
   return '';      return '';
   }
   
   sub start_problemtype {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
       my $result;
       if ($target eq 'web' || $target eq 'grade'   || $target eq 'answer' ||
    $target eq 'tex' || $target eq 'analyze' || $target eq 'webgrade') {
    my $mode=lc(&Apache::lonxml::get_param('mode',$parstack,$safeeval));
    if (!defined($mode)) { $mode='show'; }
    my $for=&Apache::lonxml::get_param('for',$parstack,$safeeval);
    my $found=0;
    foreach my $type (split(',',$for)) {
       if ($Apache::lonhomework::type eq lc($type)) { $found=1; }
    }
    if ($mode eq 'show' && !$found) {
       &Apache::lonxml::get_all_text("/problemtype",$parser,$style);
    }
    if ($mode eq 'hide' && $found) {
       &Apache::lonxml::get_all_text("/problemtype",$parser,$style);
    }
       } elsif ($target eq 'edit') {
    $result .=&Apache::edit::tag_start($target,$token);
    $result.=&Apache::edit::select_arg('Mode:','mode',
      [['show','Show'],
       ['hide','Hide']]
      ,$token);
    $result .=&Apache::edit::checked_arg('When used as type(s):','for',
        [ ['exam','Exam/Quiz Problem'],
          ['survey','Survey'],
          ['problem','Homework Problem'] ]
        ,$token);
    $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'mode','for');
    if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
       }
       return $result;
   }
   
   sub end_problemtype {
       return '';
 }  }
   
 sub start_startouttext {  sub start_startouttext {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my @result=(''.'');      my @result=(''.'');
   if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }      if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
   return (@result);      
       my $nesting = 
    &Apache::lonxml::set_state('outtext',
      &Apache::lonxml::get_state('outtext')+1);
       if ($nesting > 1 && $env{'request.state'} eq 'construct') {
    &Apache::lonxml::error("Nesting of &lt;startouttext /&gt; not allowed, on line ".$token->[5]);
       }
       return (@result);
 }  }
   
 sub end_startouttext {  sub end_startouttext {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
   my $result='';      my $result='';
   my $text='';      my $text='';
   
   if ($target eq 'edit') {      if ($target eq 'edit') {
     $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);   $text=&Apache::lonxml::get_all_text("endouttext",$parser,$style);
     $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>   $result.=&Apache::edit::start_table($token)."<tr><td>".&mt('Text Block')."</td>
 <td>Delete:".  <td>".&mt('Delete:').
   &Apache::edit::deletelist($target,$token)                   &Apache::edit::deletelist($target,$token)
     ."</td>   ."</td>
 <td>".  <td>".
   &Apache::edit::insertlist($target,$token).                   &Apache::edit::insertlist($target,$token).
     &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".   '</td><td align="right" valign="top">' .
       &Apache::edit::editfield($token->[1],$text,"",50,4);   &Apache::loncommon::helpLatexCheatsheet().
   }   &Apache::edit::end_row().
   if ($target eq 'modified') {                   &Apache::edit::start_spanning_row()."\n".
     $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);   &Apache::edit::editfield($token->[1],$text,"",80,8,1);
     $result='<startouttext />'.&Apache::edit::modifiedfield();      }
   }      if ($target eq 'modified') {
   if ($target eq 'tex') {   $result='<startouttext />'.&Apache::edit::modifiedfield("endouttext",$parser);
       $result .= '\noindent ';      }
   }      if ($target eq 'tex') {
   return $result;   $result .= '\noindent ';
       }
       return $result;
 }  }
   
 sub start_endouttext {  sub start_endouttext {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result='';      my $result='';
   if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }      if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
   if ($target eq "modified") { $result='<endouttext />'; }      if ($target eq "modified") {
   return $result;   $result='<endouttext />'.
       &Apache::edit::handle_insertafter('startouttext');
       }
   
       my $nesting = 
    &Apache::lonxml::set_state('outtext',
      &Apache::lonxml::get_state('outtext')-1);
       if ($nesting < 0 && $env{'request.state'} eq 'construct') {
    &Apache::lonxml::error(" Extraneous &lt;endouttext /&gt; not allowed on line ".$token->[5]);
    &Apache::lonxml::set_state('outtext', 0);
       }
       return $result;
 }  }
   
 sub end_endouttext {  sub end_endouttext {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my @result=('','');      my @result=('','');
   if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }      if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
   return (@result);      return (@result);
 }  }
   
 sub delete_startouttext {  sub delete_startouttext {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
 #  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);      #  my $text=&Apache::lonxml::get_all_text("endouttext",$parser,$style);
   my $text=$$parser['-1']->get_text("/endouttext");      my $text=$$parser['-1']->get_text("/endouttext");
   my $ntoken=$$parser['-1']->get_token();      my $ntoken=$$parser['-1']->get_token();
   &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");      &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
   &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);      &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
   # Deleting 2 parallel tag pairs, but we need the numbers later to look like       # Deleting 2 parallel tag pairs, but we need the numbers later to look like
   # they did the last time round      # they did the last time round
   &Apache::lonxml::increasedepth($ntoken);      &Apache::lonxml::increasedepth($ntoken);
   &Apache::lonxml::decreasedepth($ntoken);      &Apache::lonxml::decreasedepth($ntoken);
   return 1;      return 1;
   }
   
   sub start_simpleeditbutton {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result='';
       if (($env{'form.simple_edit_button'} ne 'off') &&
    ($target eq 'web') &&
           (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
           my $url=$env{'request.noversionuri'};
           $url=~s/\?.*$//;
    my ($symb) = &Apache::lonnet::whichuser();
    $result='<table width="100%" bgcolor="#FFFFAA" border="2"><tr><td>'.
                   '<a href="'.$url.'/smpedit?symb='.&escape($symb).'">'.&mt('Edit').'</a> - '.&mt('Note: it can take up to 10 minutes for changes to take effect for all users.').
   &Apache::loncommon::help_open_topic('Caching').'</td></tr></table><br />';
       }
       return $result;
   }
   
   sub end_simpleeditbutton {
       return '';
 }  }
   
 1;  1;
Removed from v.1.114  
changed lines
  Added in v.1.418

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