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Diff for /loncom/homework/structuretags.pm between versions 1.76 and 1.198

version 1.76, 2002/01/17 12:23:31 version 1.198, 2003/07/17 18:42:13
Line 29 Line 29
 # 6/26/2001 fixed extra web display at end of <web></web> tags  # 6/26/2001 fixed extra web display at end of <web></web> tags
 # 8/17,8/18,8/20 Gerd Kortemeyer  # 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::lonmenu;
   
 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','instructorcomment','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext',
 #  &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))  'simpleeditbutton','definetag'));
 }  }
   
 sub start_web {  sub start_web {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);      if (!($target eq 'web' || $target eq 'edit' || $target eq 'modified' ||
   if ($target eq 'web') {    $target eq 'answer' || $target eq 'grade' || $target eq 'meta' )) {
     return $bodytext;   my $bodytext=&Apache::lonxml::get_all_text("/web",$parser);
   }       }
   return '';      return '';
 }  }
   
 sub end_web {  sub end_web {
Line 53  sub end_web { Line 56  sub end_web {
 }  }
   
 sub start_tex {  sub start_tex {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);      my $result='';
   if ($target eq 'tex') {      if (!($target eq 'edit' || $target eq 'modified' ||
     return $bodytext    $target eq 'answer' || $target eq 'grade' || $target eq 'meta' )) {
   }   &Apache::lonxml::debug("tex 1");
   return '';   my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser);
       } elsif ($target eq 'tex') {
    $result=&Apache::lonxml::get_all_text("/tex",$parser);
       }
       return $result;;
 }  }
   
 sub end_tex {  sub end_tex {
Line 66  sub end_tex { Line 73  sub end_tex {
 }  }
   
 sub page_start {  sub page_start {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,$parser,$safeeval);      my %found;
   my $head_tag_start='<head>'.&Apache::lonxml::registerurl();      foreach my $taginside ($tagstack) {
   my $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.   foreach my $taglookedfor ('html','body','form') {
   'onUnload="'.&Apache::lonxml::unloadevents().'" ';      if ($taginside =~ /^$taglookedfor$/i) {$found{$taglookedfor} = 1;}
   my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);   }
   if ($background) {      }
     $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=  
                                         $background;      my $result;
     $body_tag_start.='background="'.$background.'" ';      my $head_tag_start;
   } else {      if (!defined($found{'html'})) {
     my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);   $result=&Apache::londefdef::start_html($target,$token,$tagstack,
     if ($bgcolor) {         $parstack,$parser,$safeeval);
       $body_tag_start.='bgcolor="'.$bgcolor.'" ';   $head_tag_start='<head>'.&Apache::lonmenu::registerurl(undef,$target);
     } else {      }
       $body_tag_start.='bgcolor="#ffffff"';      my $body_tag_start;
       if (!defined($found{'body'})) {
    $body_tag_start='<body onLoad="'.&Apache::lonmenu::loadevents().'" '.
       'onUnload="'.&Apache::lonmenu::unloadevents().'" ';
    my $background=&Apache::lonxml::get_param('background',$parstack,
     $safeeval);
    if ($background) {
       $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
    $background;
       $body_tag_start.='background="'.$background.'" ';
    } else {
       my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,
      $safeeval);
       if ($bgcolor) {
    $body_tag_start.='bgcolor="'.$bgcolor.'" ';
       } else {
    $body_tag_start.='bgcolor="#ffffff"';
       }
    }
    $body_tag_start.='>'.&Apache::lonmenu::menubuttons(undef,$target,1);
    if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
       my ($symb,undef,undef,undef,$publicuser)=
    &Apache::lonxml::whichuser();
       if ($symb eq '' && !$publicuser) {
    my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
    $help="Browsing resource, all submissions are temporary.<br />";
    $body_tag_start.=$help;
       }
    }
       }
       my $form_tag_start;
       if (!defined($found{'form'})) {
    $form_tag_start='<form name="lonhomework" method="POST" action="'.
       $ENV{'request.uri'}.'">';
     }      }
   }      return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
   $body_tag_start.='>';  }
   return ($result,$head_tag_start,$body_tag_start);  
   #use Time::HiRes();
   sub get_resource_name {
       my ($parstack,$safeeval)=@_;
       my $name=&Apache::lonnet::gettitle();
       if ($name eq '') {
    $name=&Apache::lonnet::EXT('resource.title');
    if ($name eq 'con_lost') { $name = ''; }
       }
       $Apache::lonhomework::name=$name;
       return $name;
   }
   
   sub setup_rndseed {
       my ($safeeval)=@_;
       my $rndseed;
       my ($symb)=&Apache::lonxml::whichuser();
       if ($ENV{'request.state'} eq "construct" || $symb eq '') {
    $rndseed=$ENV{'form.rndseed'};
    if (!$rndseed) {
       $rndseed=$Apache::lonhomework::history{'rndseed'};
       if (!$rndseed) {
    $rndseed=time;
    $ENV{'form.rndseed'}=$rndseed;
       }
    }
    if ($ENV{'form.resetdata'} eq 'New Problem Variation' ||
       $ENV{'form.newrandomization'} eq '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)) {
      $rndseed=join(',',&Math::Random::random_seed_from_phrase($rndseed));
           }
    &Apache::lonxml::debug("Setting rndseed to $rndseed");
    &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
       }
       return $rndseed;
   }
   
   sub problem_edit_header {
       return '<input type="hidden" name="submitted" value="edit" />
          <input type="hidden" name="problemmode" value="Edit" />
          <input type="submit" name="problemmode" value="Discard Edits and View" />
          <input type="submit" name="problemmode" value="EditXML" />
          <input type="submit" name="Undo" value="undo" /> <hr />
          <input type="submit" name="submit" value="Submit Changes and Edit" />
          <input type="submit" name="submit" value="Submit Changes and View" /><br /><p>&nbsp;</p><table border="0"><tr><td bgcolor="#DDDDDD">
         ';
   }
   
   sub problem_edit_footer {
       return '</td></tr></table><br /><input type="submit" name="submit" value="Submit Changes and Edit" />
       <input type="submit" name="submit" value="Submit Changes and View" />';
   }
   
   sub problem_web_to_edit_header {
       my ($rndseed)=@_;
       my $result.='<input type="hidden" name="problemmode" value="View" />
                <input type="submit" name="problemmode" value="Edit" />
                <input type="submit" name="problemmode" value="EditXML" />
                <input type="submit" name="newrandomization" value="New Randomization" />
                <input type="submit" name="resetdata" value="Reset Submissions" />
                <nobr><input type="submit" name="changerandseed" value="Change Random Seed To:" />
                 <input type="text" name="rndseed" width="10" value="'.
          $rndseed.'"
              onChange="javascript:document.lonhomework.changerandseed.click()" /></nobr>
                <input type="checkbox" name="showallfoils" ';
       if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
       $result.= ' />&nbsp;Show&nbsp;All&nbsp;Foils
                <hr />';
       my $numtoanalyze=$ENV{'form.numtoanalyze'};
       if (!$numtoanalyze) { $numtoanalyze=20; }
       $result.= '<input type="submit" name="problemmode" value="Calculate answers" /> for
                <input type="text" name="numtoanalyze" value="'.
    $numtoanalyze.'" size="5" /> versions of this problem.'.
        &Apache::loncommon::help_open_topic("Analyze_Problem",
        '',undef,undef,300).
        '<hr />';
       return $result;
 }  }
   
 sub initialize_storage {  sub initialize_storage {
   %Apache::lonhomework::results=();      %Apache::lonhomework::results=();
   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();      %Apache::lonhomework::history=();
   if ($ENV{'request.state'} eq 'construct') {      my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
     %Apache::lonhomework::history=      if ($ENV{'request.state'} eq 'construct' || $symb eq '') {
       &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);   %Apache::lonhomework::history=
       &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$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
Line 110  sub initialize_storage { Line 233  sub initialize_storage {
 # 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
 sub finalize_storage {  sub finalize_storage {
   my $result;      my $result;
   my ($temp) = keys %Apache::lonhomework::results;      my ($temp) = keys %Apache::lonhomework::results;
   if ( $temp ne '' ) {      if ( $temp ne '' ) {
     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();   my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
     if ($ENV{'request.state'} eq 'construct') {   if ($ENV{'request.state'} eq 'construct' || $symb eq '') {
       $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,      $Apache::lonhomework::results{'rndseed'}=$ENV{'form.rndseed'};
       $ENV{'request.uri'},'',$domain,$name);      $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
       &Apache::lonxml::debug('Construct Store return message:'.$result);   $ENV{'request.uri'},'',$domain,$name);
     } else {      &Apache::lonxml::debug('Construct Store return message:'.$result);
       $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,   } else {
       $symb,$courseid,$domain,$name);      $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
       &Apache::lonxml::debug('Store return message:'.$result);      $symb,$courseid,$domain,$name);
       &Apache::lonxml::debug('Store return message:'.$result);
    }
     }      }
   }      return $result;
   return $result;  
 }  }
   
 sub checkout_msg {  sub checkout_msg {
 return (<<ENDCHECKOUT);      return (<<ENDCHECKOUT);
 <h2>The resource needs to be checked out</h2>  <h2>The resource needs to be checked out</h2>
 As a resource gets checked out, a unique timestamped ID is given to it, and a  As a resource gets checked out, a unique timestamped ID is given to it, and a
 permanent record is left in the system.<p />  permanent record is left in the system.<p />
 <font color=red>  <font color=red>
 Checking out resources is subject to course policies, and may exclude future  Checking out resources is subject to course policies, and may exclude future
 credit even if done erroneously.<p />  credit even if done erroneously.<p />
 </font>    </font>
 <form method=post>  <form name="checkout" method="POST" action="$ENV{'request.uri'}">
 <input type=button name="doescheckout"   <input type="hidden" name="doescheckout" value="yes" />
 value="Check out Exam for Viewing"   <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
 onClick="if (confirm('Check out Exam?')) { this.form.submit(); }" />  
 </form>  </form>
 ENDCHECKOUT  ENDCHECKOUT
 }  }
   
 sub start_problem {  sub start_problem {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   
 #intialize globals      if ( $Apache::inputtags::part ne '' ||
   $Apache::inputtags::part='0';   $Apache::lonhomework::parsing_a_problem) {
   @Apache::inputtags::responselist = ();   &Apache::lonxml::error('Only one &lt;problem&gt; allowed in a .problem file');
   @Apache::inputtags::previous=();   #my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
   &initialize_storage();   return '';
   if ($target eq 'web') {  
     &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:");  
   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:");  
     }      }
   }  
   
   #added vars to the scripting enviroment      $Apache::lonhomework::parsing_a_problem=1;
   my $expression='$external::part='.$Apache::inputtags::part.';';  #initialize globals
   &Apache::run::run($expression,$safeeval);      $Apache::inputtags::part='0';
   my $status;      @Apache::inputtags::partlist=('0');
   my $accessmsg;      @Apache::inputtags::responselist = ();
       @Apache::inputtags::importlist = ();
   #should get back a <html> or the neccesary stuff to start XML/MathML      @Apache::inputtags::previous=();
   my ($result,$head_tag_start,$body_tag_start)=      @Apache::inputtags::previous_version=();
     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);      $Apache::structuretags::printanswer='No';
       @Apache::structuretags::whileconds=();
       @Apache::structuretags::whilebody=();
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {      @Apache::structuretags::whileline=();
     #handle exam checkout      $Apache::lonhomework::scantronmode=0;
     if ($Apache::lonhomework::type eq 'exam') {      $Apache::lonhomework::problemstatus=
       my $token=$Apache::lonhomework::history{"resource.0.outtoken"};   &Apache::lonnet::EXT('resource.0.problemstatus');
       if (($ENV{'form.doescheckout'}) && (!$token)) {  
  $token=&Apache::lonxml::maketoken();      if (defined($ENV{'scantron.maxquest'})) {
  $Apache::lonhomework::history{"resource.0.outtoken"}=$token;   $Apache::lonhomework::scantronmode=1;
       }  
       $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);  
     }      }
   
     #handle rand seed in construction space      if ($target ne 'analyze') {
     my $rndseed;   &initialize_storage();
     if ($ENV{'request.state'} eq "construct") {   if ($target eq 'web') {
       $rndseed=$ENV{'form.rndseed'};      &Apache::lonhomework::showhash(%Apache::lonhomework::history);
       if (!$rndseed) {   }
  $rndseed=time;   $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
  $ENV{'form.rndseed'}=$rndseed;   &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
       }      }
       &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);      if ($Apache::lonhomework::type eq '' ) {
     }   my $uri=$ENV{'request.uri'};
     ($status,$accessmsg) = &Apache::lonhomework::check_access('0');   if ($uri=~/\.(\w+)$/) {
     push (@Apache::inputtags::status,$status);      $Apache::lonhomework::type=$1;
     my $expression='$external::datestatus="'.$status.'";';      &Apache::lonxml::debug("Using type of $1");
     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';   } else {
       $Apache::lonhomework::type='problem';
       &Apache::lonxml::debug("Using default type, problem, :$uri:");
    }
       }
   
       #added vars to the scripting enviroment
       my $expression='$external::part='.$Apache::inputtags::part.';';
     &Apache::run::run($expression,$safeeval);      &Apache::run::run($expression,$safeeval);
     if (( $status eq 'CLOSED' ) ||      my $status;
         ( $status eq 'UNCHECKEDOUT') ||      my $accessmsg;
         ( $status eq 'BANNED')) {  
       my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);      #should get back a <html> or the neccesary stuff to start XML/MathML
       if ( $target eq "web" ) {      my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
  $result.= $head_tag_start.'</head>';   &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
         my $msg=$body_tag_start.      if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) {$result='';}
     '<h1>Not open to be viewed</h1>';  
         if ($status eq 'CLOSED') {      if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
     $msg.='The problem '.$accessmsg;      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
  } elsif ($status eq 'UNCHECKEDOUT') {   $target eq 'tex') {
             $msg.=&checkout_msg;   #handle exam checkout
         }   if ($Apache::lonhomework::type eq 'exam') {
  $result.=$msg.'<br />';      my $token=
       }   $Apache::lonhomework::history{"resource.0.outtoken"};
     } elsif ($target eq 'web') {      if (($ENV{'form.doescheckout'}) && (!$token)) {
       my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);   $token=&Apache::lonxml::maketoken();
       if ($name eq '') {    $Apache::lonhomework::history{"resource.0.outtoken"}=
  $name=&Apache::lonnet::EXT('resource.title');      $token;
  if ($name eq 'con_lost') { $name = ''; }      }
       }      $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
       $Apache::lonhomework::name=$name;  
       if ($status eq 'CAN_ANSWER') {  
  # create a page header and exit  
  $result.="$head_tag_start<title>$name</title></head>\n  
               $body_tag_start\n  
               <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".  
  '<input type="hidden" name="submitted" value="yes" />';  
  if ($ENV{'request.state'} eq "construct") {  
   $result.=  
     '<input type="hidden" name="problemmode" value="View" />  
              <input type="submit" name="problemmode" value="Edit" />  
              <input type="submit" name="problemmode" value="EditXML" />  
              Random Seed:<input type="text" name="rndseed" width="10" value="'.  
        $rndseed.'" />  
              <input type="submit" name="changerandseed" value="Change" />  
              <input type="submit" name="resetdata" value="Reset Submissions" />  
              <hr />';  
  }   }
  # if we are viewing someone else preserve that info  
  if (defined $ENV{'form.grade_symb'}) {   #handle rand seed in construction space
   foreach my $field ('symb','courseid','domain','username') {   my $rndseed=&setup_rndseed($safeeval);
     $result .= '<input type="hidden" name="grade_'.$field.   my ($symb)=&Apache::lonxml::whichuser();
       '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";   if ($ENV{'request.state'} ne "construct" && $symb eq '') {
   }      $form_tag_start.='<input type="hidden" name="rndseed" value="'.
  }   $rndseed.'" />'.
       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'      '<input type="submit" name="resetdata"
        || $status eq 'CLOSED') {                               value="New Problem Variation" />'.
  $result.=$head_tag_start.      '<input type="hidden" name="username"
   "<title>$name</title></head>\n$body_tag_start\n";                               value="'.$ENV{'form.username'}.'" /> <br />';
       }   }
     }   ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
   } elsif ($target eq 'edit') {   push (@Apache::inputtags::status,$status);
     $result.=$head_tag_start."</head>".$body_tag_start.   my $expression='$external::datestatus="'.$status.'";';
       '<form name="lonhomework" method="POST" action="'.   $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
  $ENV{'request.uri'}.'">   &Apache::run::run($expression,$safeeval);
        <input type="hidden" name="submitted" value="edit" />   &Apache::lonxml::debug("Got $status");
        <input type="hidden" name="problemmode" value="Edit" />   if (( $status eq 'CLOSED' ) ||
        <input type="submit" name="problemmode" value="View" />      ( $status eq 'UNCHECKEDOUT') ||
        <input type="submit" name="problemmode" value="EditXML" />      ( $status eq 'BANNED') ||
        <input type="submit" name="Undo" value="undo" /> <hr />      ( $status eq 'UNAVAILABLE')) {
        <input type="submit" name="submit" value="Submit Changes" /><br />      my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
       ';      if ( $target eq "web" ) {
     my $temp=&Apache::edit::insertlist($target,$token);   $result.= $head_tag_start.'</head>';
     $result.=$temp;   my $msg=$body_tag_start;
   } elsif ($target eq 'modified') {   if ($status eq 'UNAVAILABLE') {
     $result=$token->[4];      $result.='<h1>Unable to determine if this resource is open due to network problems. Please try again later.</h1>';
     $result.=&Apache::edit::handle_insert();   } else {
   } else {      $result.='<h1>Not open to be viewed</h1>';
     # page_start returned a starting result, delete it if we don't need it   }
     $result = '';   if ($status eq 'CLOSED') {
   }      $msg.='The problem '.$accessmsg;
   return $result;   } elsif ($status eq 'UNCHECKEDOUT') {
       $msg.=&checkout_msg;
    }
    $result.=$msg.'<br />';
       } elsif ($target eq 'tex') {
    $result.='\begin{document}\noindent \vskip 1 mm  \begin{minipage}{\textwidth}\vskip 0 mm';
    if ($status eq 'UNAVAILABLE') {
       $result.='Unable to determine if this resource is open due to network problems. Please try again later.\vskip 0 mm ';
    } else {
       $result.="Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
    }
       }
    } elsif ($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") {
       $result.= &problem_web_to_edit_header($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 ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
        || $status eq 'CLOSED' || $status eq 'UNAVALAILABLE') {
    $result.=$head_tag_start.
       "<title>$name</title></head>\n$body_tag_start\n";
       }
    } elsif ($target eq 'tex') {
       my $startminipage = '';
       if (not $ENV{'form.problem_split'}=~/yes/) {
    $startminipage = '\begin{minipage}{\textwidth}';
       }
       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 $weight = &Apache::lonnet::EXT("resource.$id.weight");
       my $allkeys=&Apache::lonnet::metadata($ENV{'request.uri'},'keys');
       my @allkeys = split /,/,$allkeys;
       my $allow_print_points = 0;
       foreach my $partial_key (@allkeys) {
    if ($partial_key=~m/weight/) {
       $allow_print_points++;
    }
       }
       my $duedate = &Apache::lonnet::EXT("resource.$id.duedate"); 
       $duedate = POSIX::strftime("%c",localtime($duedate));
       my $temp_file;
       my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
       if (-e $filename) {
    $temp_file = Apache::File->new($filename);
       } else {
    $temp_file = Apache::File->new('>>'.$filename);
       }
       my @due_file_content = <$temp_file>;
       my $due_file_content = $due_file_content[$#due_file_content];
       chomp $due_file_content;
       my $name_of_resourse= &get_resource_name($parstack,$safeeval);
       if ($due_file_content ne $duedate) {
    $temp_file = Apache::File->new('>'.$filename);
    print $temp_file "$duedate\n";
    if (not $ENV{'request.symb'} =~ m/\.page_/) {
       if(not $duedate=~m/1969/ and $Apache::lonhomework::type ne 'exam') {
    $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent '.$startminipage;
       } else {
    $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent \vskip 1 mm \noindent'.$startminipage;
    if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
       }
    } else {
       $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
    }
       } else {
    if (not $ENV{'request.symb'} =~ m/\.page_/) {
       $result .= '\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$ENV{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent \vskip 1 mm\noindent'.$startminipage;
       if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
    } else {
       $result .= '\vskip 1mm \\\\\\\\';
    }
       }
    }
       } elsif ($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 {  sub end_problem {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result='';      my $result='';
   my $status=$Apache::inputtags::status['-1'];      my $status=$Apache::inputtags::status['-1'];
   if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ) {      if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
     if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&   $target eq 'tex') {
        $status eq 'CAN_ANSWER') {   if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
       # if part is zero, no <part>s existed, so we need to the grading       $status eq 'CAN_ANSWER' ) {
       &Apache::inputtags::grade;      # if part is zero, no <part>s existed, so we need to the grading
     } elsif ( $target eq 'web' && $Apache::inputtags::part eq '0') {      &Apache::inputtags::grade;
       # if part is zero, no <part>s existed, so we need show the current    } elsif ( ($target eq 'web' || $target eq 'tex') &&
       # grading status    $Apache::inputtags::part eq '0' &&
       $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);    $status ne 'UNCHECKEDOUT') {
     }      # if part is zero, no <part>s existed, so we need show the current
     if (      # grading status
  ($target eq 'web' && ($ENV{'request.state'} ne 'construct')) ||      my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
  ($target eq 'answer')      $result.= $gradestatus;
        ) {   }
       if ($status eq 'CAN_ANSWER') {   if (
  $result.="</form></body>\n";       (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
       } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {      ($target eq 'answer') || ($target eq 'tex')
  $result.="</body>\n";     ) {
       }      if ($status eq 'CAN_ANSWER') {
       $result.=&Apache::lonxml::xmlend();   if ($target ne 'tex' &&
     }      $ENV{'form.answer_output_mode'} ne 'tex') {
     if ($target eq 'grade') {       $result.="</form></body>\n";
       &Apache::lonhomework::showhash(%Apache::lonhomework::results);   }
       &finalize_storage();      } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
     }       $status eq 'UNCHECKEDOUT' ) {
   } elsif ($target eq 'meta') {   if ($target ne 'tex' &&
     if ($Apache::inputtags::part eq '0') {      $ENV{'form.answer_output_mode'} ne 'tex') {
       $result=&Apache::response::mandatory_part_meta;      $result.="</body>\n";
     }   }
   } elsif ($target eq 'edit') {      }
     &Apache::lonxml::debug("in end_problem with $target, edit");      if ($target eq 'web') {
     $result='<br /><input type="submit" name="submit" value="Submit Changes" />';   $result.=&Apache::lonxml::xmlend();
   }      } elsif ($target eq 'tex') {
   return $result;   my $endminipage = '';
    if (not $ENV{'form.problem_split'}=~/yes/) {
       $endminipage = '\end{minipage}';
    }
    $result .= '\keephidden{ENDOFPROBLEM}\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
    if (not $ENV{'request.symb'} =~ m/\.page_/) {
       $result .= $endminipage.'\end{document} ';
    } else {
       $result .= '';
    }
       }
    }
    if ($target eq 'grade') {
       &Apache::lonhomework::showhash(%Apache::lonhomework::results);
       &finalize_storage();
    }
    if ($target eq 'answer' && ($ENV{'request.state'} eq 'construct')
       && $ENV{'form.answer_output_mode'} ne 'tex') {
       $result.='</html>'; # normally we get it from xmlend, but in CSTR
                           # we always show answer mode too.
    }
       } elsif ($target eq 'meta') {
    if ($Apache::inputtags::part eq '0') {
       @Apache::inputtags::response=();
       $result=&Apache::response::mandatory_part_meta;
    }
       } elsif ($target eq 'edit') {
    &Apache::lonxml::debug("in end_problem with $target, edit");
    $result = &problem_edit_footer();
       }
   
       if ($ENV{'request.state'} eq 'construct' && $target eq 'web') {
    &Apache::inputtags::check_for_duplicate_ids();
       }
       undef(%Apache::lonhomework::history);
       undef(%Apache::lonhomework::results);
       undef($Apache::inputtags::part);
       undef($Apache::lonhomework::parsing_a_problem);
   
       return $result;
 }  }
   
   
 sub start_library {  sub start_library {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my ($result,$head_tag_start,$body_tag_start)=      my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
     &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);  
   if ($target eq 'edit') {      if ($target eq 'edit') {
     $result.=$head_tag_start."</head>".$body_tag_start.   ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
       '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">      &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
        <input type="hidden" name="submitted" value="edit" />   $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
        <input type="hidden" name="problemmode" value="Edit" />      &problem_edit_header();
        <input type="submit" name="problemmode" value="View" />   my $temp=&Apache::edit::insertlist($target,$token);
        <input type="submit" name="Undo" value="undo" /> <hr />   $result.=$temp;
       ';      } elsif ($target eq 'modified') {
     my $temp=&Apache::edit::insertlist($target,$token);   $result=$token->[4];
     $result.=$temp;   $result.=&Apache::edit::handle_insert();
     return $result;      } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
   }       $ENV{'request.state'} eq "construct" ) {
   if ($target eq 'modified') {   ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
     $result=$token->[4];      &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
     $result.=&Apache::edit::handle_insert();   my $name=&get_resource_name($parstack,$safeeval);
    my $rndseed=&setup_rndseed($safeeval);
    $result.="$head_tag_start<title>$name</title></head>
                 $body_tag_start \n $form_tag_start".
     '<input type="hidden" name="submitted" value="yes" />';
    $result.=&problem_web_to_edit_header($rndseed);
       }
     return $result;      return $result;
   }  
   return '';  
 }  }
   
 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='<br /><input type="submit" name="submit" value="Submit Changes" />';   $result=&problem_edit_footer();
   }      } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
   return $result;       $ENV{'request.state'} eq "construct") {
    $result.='</form></body>'.&Apache::lonxml::xmlend();
       }
       return $result;
   }
   
   sub start_definetag {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   
       my $result;
   
       my $name = $token->[2]->{'name'};
       my $skip=&Apache::lonxml::get_all_text("/definetag",$parser);
       if ($name=~/^\//) {
    $result=
    '<br /><table bgcolor="#FFBBBB"><tr><th>END <tt>'.$name.'</tt></th></tr>';
       } else {
    $result=
    '<br /><table bgcolor="#BBFFBB"><tr><th>BEGIN <tt>'.$name.'</tt></th></tr>';
       }
       $skip=~s/\</\&lt\;/gs;
       $skip=~s/\>/\&gt\;/gs;
       $result.='<tr><td><pre>'.$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)=@_;
   
       my $result;
   
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
     my $code = @$parstack[$#$parstack];   $target eq 'tex' || $target eq 'analyze') {
     $code =~ s/\"//g;   my $code = $token->[2]->{'condition'};
     $code .=';return $condition;';   if ($code) {
     #  print "<br />$code<br />";      if (!$Apache::lonxml::default_homework_loaded) {
     my $result = &Apache::run::run($code,$safeeval);   &Apache::lonxml::default_homework_load($safeeval);
     &Apache::lonxml::debug("block :$code: returned :$result:");      }
     if ( ! $result ) {       $result = &Apache::run::run($code,$safeeval);
       my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);      &Apache::lonxml::debug("block :$code: returned :$result:");
       &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");   } else {
       $result='1';
    }
    if ( ! $result ) {
       my $skip=&Apache::lonxml::get_all_text("/block",$parser);
       &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)=@_;
   
       my $result;
   
       if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
    $target eq 'tex' || $target eq 'analyze') {
    &Apache::lonxml::startredirection();
       } elsif ($target eq 'edit') {
    $result .=&Apache::edit::tag_start($target,$token);
    $result .=&Apache::edit::text_arg('Include Language:','include',
     $token,40);
    $result .=&Apache::edit::text_arg('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 'web' || $target eq 'grade' || $target eq 'answer' ||
    $target eq 'tex' || $target eq 'analyze') {
    my $text=&Apache::lonxml::endredirection();
    my $include= &Apache::lonxml::get_param('include',$parstack,$safeeval);
    my $exclude= &Apache::lonxml::get_param('exclude',$parstack,$safeeval);
    my %languages=&Apache::loncommon::display_languages();
    $result='1';
    if ($include) {
       $result='';
       foreach (split(/\,/,$include)) {
    if ($languages{$_}) { $result='1'; }
       }
    }
    if ($exclude) {
       foreach (split(/\,/,$exclude)) {
    if ($languages{$_}) { $result='0'; }
       }
    }
    if ( ! $result ) {
       $result='';
    } else {
       $result=$text;
    }
       } elsif ($target eq "edit") {
    $result.= &Apache::edit::tag_end($target,$token,'');
       }
       return $result;
   }
   
   sub start_instructorcomment {
       my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   
       my $result;
   
       if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
    $target eq 'tex' || $target eq 'analyze') {
           $result=($ENV{'request.role'}=~/^(in|cc|au|ca|li)/);
    if ( ! $result ) {
       my $skip=&Apache::lonxml::get_all_text("/instructorcomment",$parser);
       &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)=@_;
   
   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') {
    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);
   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('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' || $target eq 'analyze') {
     &Apache::lonxml::newparser($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);
       $return = &Apache::run::run($code,$safeeval);
    }
    if ($error) {
       &Apache::lonxml::error('<pre>Code ran too long. It ran for more than '.$Apache::lonnet::perlvar{'lonScriptTimeout'}.' seconds occured while running &lt;while$gt; on line '.$line.'</pre>');
    }
       } elsif ($target eq "edit") {
    $result.= &Apache::edit::tag_end($target,$token,'');
       }
       return $result;
 }  }
   
 # <randomlist>   # <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)=@_;
   if ($target eq 'answer' || $target eq 'grade' || $target eq 'web') {      my $result;
     my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);      if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
     my $b_parser= HTML::TokeParser->new(\$body);   $target eq 'tex' || $target eq 'analyze') {
     my $b_tok;   my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
     my @randomlist;   my $b_parser= HTML::TokeParser->new(\$body);
     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 $b_tok->[1]</b><br />";
     }      }
       # if($b_tok->[0] eq 'E') { # end tag, should not happen
     my @idx_arr = (0 .. $#randomlist);      #  print "<b>END-TAG $b_tok->[1]</b><br />";
     &Apache::structuretags::shuffle(\@idx_arr);      # }
     my $bodytext = '';   }
     for(0 .. $#randomlist) {   my @idx_arr = (0 .. $#randomlist);
       $bodytext .= "$randomlist[ $idx_arr[$_] ]";   &Apache::structuretags::shuffle(\@idx_arr);
     }   my $bodytext = '';
     &Apache::lonxml::newparser($parser,\$bodytext);   my $show=$#randomlist;
   }   my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
   return "";   $showarg--;
    if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
    for(0 .. $show) {
       $bodytext .= "$randomlist[ $idx_arr[$_] ]";
    }
    &Apache::lonxml::newparser($parser,\$bodytext);
       } elsif ($target eq 'edit' ) {
    $result .=&Apache::edit::tag_start($target,$token);
    $result .=&Apache::edit::text_arg('Maximum Tags to Show:','show',
      $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 (defined(@$a)) {
       &Apache::response::setrandomnumber();   &Apache::response::setrandomnumber();
       for($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];
       }   }
     }      }
 }  }
   
 sub end_randomlist {  sub end_randomlist {
   return '';      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
       my $result;
       if ($target eq 'edit' ) {
    $result=&Apache::edit::tag_end($target,$token,
          'End Randomly Parsed Block');
       }
       return $result;
 }  }
   
 sub start_part {  sub start_part {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);      my $result='';
   if ($id eq '') { $id = $Apache::lonxml::curdepth; }      my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
   $Apache::inputtags::part=$id;      if ($id eq '') { $id = $Apache::lonxml::curdepth; }
   @Apache::inputtags::responselist = ();      $Apache::inputtags::part=$id;
   @Apache::inputtags::previous=();      push(@Apache::inputtags::partlist,$id);
   if ($target eq 'meta') {      @Apache::inputtags::response=();
     return &Apache::response::mandatory_part_meta;      @Apache::inputtags::previous=();
   } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {      @Apache::inputtags::previous_version=();
     my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);      $Apache::lonhomework::problemstatus=
     push (@Apache::inputtags::status,$status);   &Apache::lonnet::EXT("resource.$id.problemstatus");
     my $expression='$external::datestatus="'.$status.'";';      my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
     $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';  
     &Apache::run::run($expression,$safeeval);      if ($target eq 'meta') {
     if ( $status eq 'CLOSED' ) {   return &Apache::response::mandatory_part_meta;
       my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);      } elsif ($target eq 'web' || $target eq 'grade' ||
       if ( $target eq "web" ) {       $target eq 'answer' || $target eq 'tex') {
  return "<br />Part is not open to be viewed. It $accessmsg<br />";   if ($hidden) {
       }      my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
    } 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 ( $status eq 'CLOSED' ) {
    my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
    if ( $target eq "web" ) {
       $result="<br />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 Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
       } else {
    $result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";
       }
    }
       } else {
    if ($target eq 'tex') {
       if (not $ENV{'form.problem_split'}=~/yes/) {
    $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
       }
       my $weight = &Apache::lonnet::EXT("resource.$id.weight");
       if ($Apache::lonhomework::type eq 'exam') { $result .= '\fbox{\textit{'.$weight.' pt}}';}
    }
       }
    }
       } 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").
    &Apache::edit::end_row().&Apache::edit::start_spanning_row();
       } elsif ($target eq 'modified') {
    my $constructtag=&Apache::edit::get_new_args($token,$parstack,
        $safeeval,'id');
    if ($constructtag) {
       $result = &Apache::edit::rebuild_tag($token);
       $result.=&Apache::edit::handle_insert();
    }
     }      }
   }      return $result;
   return '';  
 }  }
   
 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 $result='';
   if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {      if ( $target eq 'meta' ) {
     return &Apache::inputtags::grade;   $result='';
   }      } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER' && !$hidden) {
   if ($target eq 'web') {   $result=&Apache::inputtags::grade;
     return &Apache::inputtags::gradestatus($Apache::inputtags::part);      } elsif (($target eq 'web' || $target eq 'tex') && !$hidden ) {
   }   my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
   return '';   $target);
    if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
    $result=$gradestatus;
       } elsif ($target eq 'edit') {
    $result=&Apache::edit::end_table();
       }
       pop @Apache::inputtags::status;
       $Apache::inputtags::part='';
       return $result;
 }  }
   
 sub start_preduedate {  sub start_preduedate {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
     if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&   if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
  $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {      $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
       &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);      $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
       &Apache::lonxml::get_all_text("/preduedate",$parser);
    }
     }      }
   }      return '';
   return '';  
 }  }
   
 sub end_preduedate {  sub end_preduedate {
   return '';      return '';
 }  }
   
 sub start_postanswerdate {  sub start_postanswerdate {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   if ($target eq 'web' || $target eq 'grade') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
     if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {   if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
       &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);      &Apache::lonxml::get_all_text("/postanswerdate",$parser);
    }
       } elsif ($target eq 'tex') {
    return '\vskip 0 mm \noindent';
     }      }
   }      return '';
   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)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {      if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
     my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};   $target eq 'tex') {
     &Apache::lonxml::debug("not solved has :$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::lonxml::debug("skipping");
       &Apache::lonxml::get_all_text("/notsolved",$parser);
    }
     }      }
   }      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)=@_;
   if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {      if ($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 ($gradestatus !~ /^correct/) {
       &Apache::lonxml::get_all_text("/solved",$parser);
    }
     }      }
   }      return '';
   return '';  
 }  }
   
 sub end_solved {  sub end_solved {
   return '';      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);      return (@result);
 }  }
   
 sub end_startouttext {  sub end_startouttext {
   my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;      my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result='';      my $result='';
   my $text='';      my $text='';
   
   if ($target eq 'edit') {      if ($target eq 'edit') {
     $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);   $text=&Apache::lonxml::get_all_text("endouttext",$parser);
     $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>   $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
 <td>Delete:".  <td>Delete:".
   &Apache::edit::deletelist($target,$token)                   &Apache::edit::deletelist($target,$token)
   ."</td>   ."</td>
 <td>".  <td>".
   &Apache::edit::insertlist($target,$token).                   &Apache::edit::insertlist($target,$token).
     &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".   &Apache::edit::end_row().
  &Apache::edit::editfield($token->[1],$text,"",50,4);                   &Apache::edit::start_spanning_row()."\n"
   }   . &Apache::loncommon::helpLatexCheatsheet () .
   if ($target eq 'modified') {   &Apache::edit::editfield($token->[1],$text,"",80,4);
     $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);      }
     $result='<startouttext />'.&Apache::edit::modifiedfield();      if ($target eq 'modified') {
   }   $text=&Apache::lonxml::get_all_text("endouttext",$parser);
   return $result;   $result='<startouttext />'.&Apache::edit::modifiedfield();
       }
       if ($target eq 'tex') {
    $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'); }
       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)=@_;
 #  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);      #  my $text=&Apache::lonxml::get_all_text("endouttext",$parser);
   my $text=$$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 $result='';
       if (($target eq 'web') &&
           (&Apache::lonnet::allowed('srm',$ENV{'request.course.id'}))) {
           my $url=$ENV{'REQUEST_URI'};
           $url=~s/\?.*$//;
    $result='<table width="100%" bgcolor="#FFFFAA" border="2"><tr><td>'.
                   '<a href="'.$url.'/smpedit">Simple Problem Editor</a> - 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.1.76  
changed lines
  Added in v.1.198

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