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Diff for /loncom/homework/structuretags.pm between versions 1.19 and 1.121

version 1.19, 2000/12/04 21:51:30 version 1.121, 2002/10/01 21:04:34
Line 1 Line 1
 # The LearningOnline Network with CAPA # <script> definiton  # The LearningOnline Network with CAPA 
   # definition of tags that give a structure to a document
   #
   # $Id$
   #
   # Copyright Michigan State University Board of Trustees
   #
   # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
   #
   # LON-CAPA is free software; you can redistribute it and/or modify
   # it under the terms of the GNU General Public License as published by
   # the Free Software Foundation; either version 2 of the License, or
   # (at your option) any later version.
   #
   # LON-CAPA is distributed in the hope that it will be useful,
   # but WITHOUT ANY WARRANTY; without even the implied warranty of
   # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   # GNU General Public License for more details.
   #
   # You should have received a copy of the GNU General Public License
   # along with LON-CAPA; if not, write to the Free Software
   # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   #
   # /home/httpd/html/adm/gpl.txt
   #
   # http://www.lon-capa.org/
   #
   # 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();
   
 sub BEGIN {  BEGIN {
   &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','web','tex','part'));    &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
   #  &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
 }  }
   
 sub start_web {  sub start_web {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);    my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
   if ($target eq 'web') {    if ($target eq 'web') {
     return $bodytext;      return $bodytext;
Line 19  sub start_web { Line 50  sub start_web {
 }  }
   
 sub end_web {  sub end_web {
       return '';
 }  }
   
 sub start_tex {  sub start_tex {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);    my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
   if ($target eq 'tex') {    if ($target eq 'tex') {
     return $bodytext        return $bodytext.' ';
   }    }
   return '';    return '';
 }  }
   
 sub end_tex {  sub end_tex {
       return '';
   }
   
   sub page_start {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my %found;
     foreach my $taginside ($tagstack) {
       foreach my $taglookedfor ('html','body','form') {
         if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
       }
     }
   
     my $result;
     my $head_tag_start;
     if (!defined($found{'html'})) {
       $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
      $parser,$safeeval);
       $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);
     }
     my $body_tag_start;
     if (!defined($found{'body'})) {
       $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
         'onUnload="'.&Apache::lonxml::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.='>';
     }
     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);
   }
   
   sub get_resource_name {
     my ($parstack,$safeeval)=@_;
     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;
     return $name;
   }
   
   sub setup_rndseed {
     my ($safeeval)=@_;
     my $rndseed;
     if ($ENV{'request.state'} eq "construct") {
       $rndseed=$ENV{'form.rndseed'};
       if (!$rndseed) {
         $rndseed=time;
         $ENV{'form.rndseed'}=$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" />
          <input type="submit" name="submit" value="Submit Changes and View" /><br />
         ';
   }
   
   sub problem_edit_footer {
     return '<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" />
                Random Seed:<input type="text" name="rndseed" width="10" value="'.
          $rndseed.'" />
                <input type="submit" name="changerandseed" value="Change" />
                <input type="submit" name="resetdata" value="Reset Submissions" />
                <input type="checkbox" name="showallfoils" ';
     if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
     $result.= ' />&nbsp;Show&nbsp;All&nbsp;Foils
                <hr />';
   }
   
   sub initialize_storage {
     %Apache::lonhomework::results=();
     my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
     if ($ENV{'request.state'} eq 'construct') {
       %Apache::lonhomework::history=
         &Apache::lonnet::tmprestore($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 ;
     if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
   }
   
   # -------------------------------------------------------------finalize_storage
   # Stores away the result has to a student's environment
   # checks form.grade_ for specific values, other wises stores
   # to the running users environment
   sub finalize_storage {
     my $result;
     my ($temp) = keys %Apache::lonhomework::results;
     if ( $temp ne '' ) {
       my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
       if ($ENV{'request.state'} eq 'construct') {
         $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
         $ENV{'request.uri'},'',$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);
       }
     }
     return $result;
   }
   
   sub checkout_msg {
   return (<<ENDCHECKOUT);
   <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
   permanent record is left in the system.<p />
   <font color=red>
   Checking out resources is subject to course policies, and may exclude future
   credit even if done erroneously.<p />
   </font>
   <form name="checkout" method="POST" action="$ENV{'request.uri'}">
   <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(); }" />
   </form>
   ENDCHECKOUT
 }  }
   
 sub start_problem {  sub start_problem {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   
     # 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  #intialize globals
   $Apache::inputtags::part='0';    $Apache::inputtags::part='0';
   @Apache::inputtags::responselist = ();    @Apache::inputtags::responselist = ();
     @Apache::inputtags::previous=();
     if ($target ne 'analyze') {
       &initialize_storage();
       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:");
       }
     }
   
 #adeed vars to the scripting enviroment    #added vars to the scripting enviroment
   my $expression='$external::part='.$Apache::inputtags::part.';';    my $expression='$external::part='.$Apache::inputtags::part.';';
   &Apache::run::run($expression,$safeeval);    &Apache::run::run($expression,$safeeval);
     my $status;
     my $accessmsg;
   
   if ($target eq 'web') {    #should get back a <html> or the neccesary stuff to start XML/MathML
     # create a page header and exit    my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
     my $args ='';      &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
     if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }    if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
     my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);  
     return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n<form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">";    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
   }       #handle exam checkout
   return '';      if ($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;
         }
         $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
       }
   
       #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 'tex') {
     $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm 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") {
     $result.= &problem_web_to_edit_header($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 $duedate = &Apache::lonnet::EXT("resource.$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 $due_file_content;
           if ($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/) {
       $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
    } else {
       $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
    }
       } else {
    $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
       } 
    } else {
       if (not $ENV{'request.symb'} =~ m/\.page_/) {
    $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
       } 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,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $result='';    my $result='';
   unless ($target eq 'meta') {    my $status=$Apache::inputtags::status['-1'];
     if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
     if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {      if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
       # if part is zero, no <part>s existed, so we need to the grading        # if part is zero, no <part>s existed, so we need to the grading
       &Apache::inputtags::grade;        &Apache::inputtags::grade;
     } elsif ($Apache::inputtags::part eq '0') {      } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' && 
         $status ne 'UNCHECKEDOUT') {
       # if part is zero, no <part>s existed, so we need show the current         # if part is zero, no <part>s existed, so we need show the current 
       # grading status        # grading status
       $result.= &Apache::inputtags::gradestatus;        my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part);
     }         #FIXME this is ugly we should just generate tex in inputtags
     if ($target eq 'web') { $result.="</form></body>\n"; }        if ($target eq 'tex') { $gradestatus=&html_to_tex($gradestatus); }
   } else {        if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
       }
       if (
    (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
    ($target eq 'answer') || ($target eq 'tex')
          ) {
         if ($status eq 'CAN_ANSWER') {
     if ($target ne 'tex') {
         $result.="</form></body>\n";
     } 
         } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
          $status eq 'UNCHECKEDOUT' ) {
     if ($target ne 'tex') {
         $result.="</body>\n";
     }
         }
         if ($target ne 'tex') {
     $result.=&Apache::lonxml::xmlend();
         } else {
         $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
         if (not $ENV{'request.symb'} =~ m/\.page_/) {
     $result .= '\end{minipage}\end{document} ';
         } else {
     $result .= '';
         }
         }
       }
       if ($target eq 'grade') { 
         &Apache::lonhomework::showhash(%Apache::lonhomework::results);
         &finalize_storage();
       }
     } elsif ($target eq 'meta') {
     if ($Apache::inputtags::part eq '0') {      if ($Apache::inputtags::part eq '0') {
       $result=&Apache::response::mandatory_part_meta;        $result=&Apache::response::mandatory_part_meta;
     }      }
     } elsif ($target eq 'edit') {
       &Apache::lonxml::debug("in end_problem with $target, edit");
       $result = &problem_edit_footer();
     } 
     return $result;
   }
   
   
   sub start_library {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
   
     if ($target eq 'edit') {
       ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
         &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
       $result.=$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];
       $result.=&Apache::edit::handle_insert();
     } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
      $ENV{'request.state'} eq "construct" ) {
       ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
         &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
       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;
   }
   
   sub end_library {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my $result='';
     if ($target eq 'edit') {
       $result=&problem_edit_footer();
     } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
      $ENV{'request.state'} eq "construct") {
       $result.='</form></body>'.&Apache::lonxml::xmlend();
   }    }
   return $result;    return $result;
 }  }
   
 sub start_block {  sub start_block {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   
   my $code = @$parstack[$#$parstack];    if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
   $code =~ s/\"//g;      my $code = @$parstack[$#$parstack];
   $code .=';return $condition;';      $code =~ s/\"//g;
 #  print "<br>$code<br>";      $code .=';return $condition;';
   my $result = &Apache::run::run($code,$safeeval);      #  print "<br />$code<br />";
   if ( ! $result ) {       my $result = &Apache::run::run($code,$safeeval);
 #    my $skip=$$parser[$#$parser]->get_text("/block");      &Apache::lonxml::debug("block :$code: returned :$result:");
     my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);      if ( ! $result ) { 
 #    print "skipped $skip";        my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
         &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
       }
   }    }
   return "";    return "";
 }  }
   
 sub end_block {  sub end_block {
     return '';
 }  }
   
 sub start_while {  sub start_while {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   
   my $code = @$parstack[$#$parstack];    my $code = @$parstack[$#$parstack];
   $code =~ s/\"//g;    $code =~ s/\"//g;
Line 112  sub start_while { Line 515  sub start_while {
 }  }
   
 sub end_while {  sub end_while {
   my ($target,$token,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $code = pop @Apache::structuretags::whileconds;    my $code = pop @Apache::structuretags::whileconds;
   my $bodytext = pop @Apache::structuretags::whilebody;    my $bodytext = pop @Apache::structuretags::whilebody;
   my $result = &Apache::run::run($code,$safeeval);    my $result = &Apache::run::run($code,$safeeval);
Line 122  sub end_while { Line 525  sub end_while {
   return "";    return "";
 }  }
   
 # <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,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);    my $result;
   my $b_parser= HTML::TokeParser->new(\$body);    if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
   my $b_tok;        $target eq 'tex') {
   my @randomlist;      my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
   my $list_item;      my $b_parser= HTML::TokeParser->new(\$body);
       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],$b_parser);
    #  print "<BR><B>START-TAG $b_tok->[1], $b_tok->[4], $list_item</B>";   $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
     }   push(@randomlist,$list_item);
     if($b_tok->[0] eq 'T') { # text   #  print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
     # what to do with text in between tags?        }
       #  print "<B>TEXT $b_tok->[1]</B><BR>";        if($b_tok->[0] eq 'T') { # text
     }   # what to do with text in between tags?
     # if($b_tok->[0] eq 'E') { # end tag, should not happen   #  print "<b>TEXT $b_tok->[1]</b><br />";
       #  print "<B>END-TAG $b_tok->[1]</B><BR>";        }
     # }        # if($b_tok->[0] eq 'E') { # end tag, should not happen
   }        #  print "<b>END-TAG $b_tok->[1]</b><br />";
   my @idx_arr = (0 .. $#randomlist);        # }
   &Apache::structuretags::shuffle(\@idx_arr);      }
   my $bodytext = '';      my @idx_arr = (0 .. $#randomlist);
   for(0 .. $#randomlist) {      &Apache::structuretags::shuffle(\@idx_arr);
     $bodytext .= "$randomlist[ $idx_arr[$_] ]";      my $bodytext = '';
       my $show=$#randomlist;
       my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
       $showarg--;
       if ( ($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 $result;
   &Apache::lonxml::newparser($parser,\$bodytext);  
   return "";  
 }  }
   
 sub shuffle {  sub shuffle {
     my $a=shift;      my $a=shift;
     my $i;      my $i;
     for($i=@$a;--$i;) {      if (defined(@$a)) {
       my $j=int rand($i+1);        &Apache::response::setrandomnumber();
       next if $i == $j;        for($i=@$a;--$i;) {
       @$a[$i,$j] = @$a[$j,$i];   my $j=int(&Math::Random::random_uniform() * ($i+1));
    next if $i == $j;
    @$a[$i,$j] = @$a[$j,$i];
         }
     }      }
 }  }
   
 sub end_randomlist {  sub end_randomlist {
     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,$parstack,$parser,$safeeval)=@_;    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   my $args ='';    my $result='';
   if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }    my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
   my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);    if ($id eq '') { $id = $Apache::lonxml::curdepth; }
   $Apache::inputtags::part=$id;    $Apache::inputtags::part=$id;
   @Apache::inputtags::responselist = ();    @Apache::inputtags::responselist = ();
     @Apache::inputtags::previous=();
   if ($target eq 'meta') {    if ($target eq 'meta') {
     return &Apache::response::mandatory_part_meta;      return &Apache::response::mandatory_part_meta;
     } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
       my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
       push (@Apache::inputtags::status,$status);
       my $expression='$external::datestatus="'.$status.'";';
       $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
       &Apache::run::run($expression,$safeeval);
       if ( $status eq 'CLOSED' ) {
         my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
         if ( $target eq "web" ) {
    $result="<br />Part is not open to be viewed. It $accessmsg<br />";
         } elsif ( $target eq 'tex' ) {
    $result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";
         }
       } else {
         if ($target eq 'tex') {
    $result='\vskip 0 mm';
         }
       }
   }    }
   return '';    return $result;
 }  }
   
 sub end_part {  sub end_part {
   my ($target,$token,$parstack,$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'];
     pop @Apache::inputtags::status;
   if ( $target eq 'meta' ) { return ''; }    if ( $target eq 'meta' ) { return ''; }
   if ( $target eq 'grade' ) { return &Apaceh::inputtags::grade; }    if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
   return &Apache::inputtags::gradestatus;      return &Apache::inputtags::grade;
     }
     if ($target eq 'web' || $target eq 'tex' ) {
       my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
       if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
       return $gradestatus;
     }
     return '';
   }
   
   sub start_preduedate {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
       if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
    $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
         &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
       }
     }
     return '';
   }
   
   sub end_preduedate {
     return '';
   }
   
   sub start_postanswerdate {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
       if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
         &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
       }
     } elsif ($target eq 'tex') {
         return '\vskip 0 mm \noindent';
     }
     return '';
   }
   
   sub end_postanswerdate {
     return '';
   }
   
   sub start_notsolved {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
       my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
       &Apache::lonxml::debug("not solved has :$gradestatus:");
       if ($gradestatus =~ /^correct/) {
         &Apache::lonxml::debug("skipping");
         &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
       }
     }
     return '';
   }
   
   sub end_notsolved {
     return '';
   }
   
   sub start_solved {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
       my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
       if ($gradestatus !~ /^correct/) {
         &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
       }
     }
     return '';
   }
   
   sub end_solved {
     return '';
   }
   
   sub start_startouttext {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my @result=(''.'');
     if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
     return (@result);
   }
   sub end_startouttext {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my $result='';
     my $text='';
   
     if ($target eq 'edit') {
       $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
       $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
   <td>Delete:".
     &Apache::edit::deletelist($target,$token)
       ."</td>
   <td>".
     &Apache::edit::insertlist($target,$token).
       &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
         &Apache::edit::editfield($token->[1],$text,"",80,4);
     }
     if ($target eq 'modified') {
       $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
       $result='<startouttext />'.&Apache::edit::modifiedfield();
     }
     if ($target eq 'tex') {
         $result .= '\noindent ';
     }
     return $result;
   }
   sub start_endouttext {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my $result='';
     if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
     if ($target eq "modified") { $result='<endouttext />'; }
     return $result;
   }
   sub end_endouttext {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     my @result=('','');
     if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
     return (@result);
   }
   sub delete_startouttext {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
   #  my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
     my $text=$$parser['-1']->get_text("/endouttext");
     my $ntoken=$$parser['-1']->get_token();
     &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
     &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
     # Deleting 2 parallel tag pairs, but we need the numbers later to look like 
     # they did the last time round
     &Apache::lonxml::increasedepth($ntoken);
     &Apache::lonxml::decreasedepth($ntoken);
     return 1;
 }  }
   
 1;  1;
Removed from v.1.19  
changed lines
  Added in v.1.121

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