--- loncom/homework/structuretags.pm	2005/06/28 19:17:36	1.295
+++ loncom/homework/structuretags.pm	2005/11/08 17:53:20	1.316
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # definition of tags that give a structure to a document
 #
-# $Id: structuretags.pm,v 1.295 2005/06/28 19:17:36 albertel Exp $
+# $Id: structuretags.pm,v 1.316 2005/11/08 17:53:20 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -74,8 +74,7 @@ sub body_tag_start {
 	'onunload="'.&Apache::lonmenu::unloadevents().'" ';
     if ($env{'browser.imagesuppress'} eq 'on') { $background=''; }
     if ($background) {
-	$Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
-	    $background;
+	&Apache::lonxml::extlink($background);
 	$body_tag_start.='background="'.$background.'" ';
     } else {
 	if (($bgcolor) && ($env{'browser.blackwhite'} ne 'on')) {
@@ -88,11 +87,10 @@ sub body_tag_start {
 	$body_tag_start.=' style="font-size: x-large;" ';
     }
     $body_tag_start.='>'.&Apache::lonmenu::menubuttons(undef,$target,1);
+    
+    &Apache::lontexconvert::jsMath_reset();
     if ($env{'environment.texengine'} eq 'jsMath') {
-	$body_tag_start.='<script type="text/javascript">
-                     function NoFontMessage () {}
-                   </script>'."\n".
-		       '<script src="/adm/jsMath/jsMath.js"></script>'."\n";
+	$body_tag_start.=&Apache::lontexconvert::jsMath_header();
     }
     return $body_tag_start;
 }
@@ -119,14 +117,16 @@ sub page_start {
     my $body_tag_start;
     if (!defined($found{'body'}) && $env{'request.state'} eq 'construct'
 	&& $env{'environment.remote'} eq 'off') {
-	$body_tag_start=&Apache::loncommon::bodytag();
-	$body_tag_start.=&Apache::lonxml::message_location();
+	if ($target eq 'web' || $target eq 'edit') {
+	    $body_tag_start=&Apache::loncommon::bodytag();
+	    $body_tag_start.=&Apache::lonxml::message_location();
+	}
     } elsif (!defined($found{'body'})) {
 	my $background=&Apache::lonxml::get_param('background',$parstack,
 						  $safeeval);
 	my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,
 					       $safeeval);
-	$body_tag_start=&body_tag_start($background,$bgcolor);
+	$body_tag_start=&body_tag_start($target,$background,$bgcolor);
 	if ( ($target eq 'web' || $target eq 'webgrade')
 	     && $env{'request.state'} ne 'construct') {
 	    my ($symb,undef,undef,undef,$publicuser)=
@@ -175,6 +175,8 @@ sub setup_rndseed {
     my ($symb)=&Apache::lonxml::whichuser();
     if ($env{'request.state'} eq "construct" || $symb eq '' ||
           $Apache::lonhomework::history{'resource.CODE'}) {
+	&Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+						  ['rndseed']);
 	$rndseed=$env{'form.rndseed'};
 	if (!$rndseed) {
 	    $rndseed=$Apache::lonhomework::history{'rndseed'};
@@ -192,7 +194,7 @@ sub setup_rndseed {
 	    delete($env{'form.newrandomization'});
 	}
 	if (defined($rndseed) && $rndseed ne int($rndseed)) {
-	   $rndseed=join(',',&Math::Random::random_seed_from_phrase($rndseed));
+	    $rndseed=join(':',&Apache::lonnet::digest($rndseed));
         }
         if ($Apache::lonhomework::history{'resource.CODE'}) {
 	   $rndseed=&Apache::lonnet::rndseed();
@@ -245,9 +247,11 @@ sub option {
 
 sub problem_web_to_edit_header {
     my ($rndseed)=@_;
-    my $result.='<input type="hidden" name="problemmode" value="'.&mt('View').'" />
-             <input type="submit" name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
-             <input type="submit" name="problemmode" accesskey="x" value="'.&mt('EditXML').'" />
+    my $result.='<input type="hidden" name="problemmode" value="'.&mt('View').'" />';
+    if (!$Apache::lonhomework::parsing_a_task) {
+	$result .= '<input type="submit" name="problemmode" accesskey="e" value="'.&mt('Edit').'" />';
+    }
+    $result .= '<input type="submit" name="problemmode" accesskey="x" value="'.&mt('EditXML').'" />
              <input type="submit" name="newrandomization" accesskey="a" value="'.&mt('New Randomization').'" />
              <input type="submit" name="resetdata" accesskey="r" value="'.&mt('Reset Submissions').'" />
              <nobr><input type="submit" name="changerandseed" value="'.&mt('Change Random Seed To:').'" />
@@ -255,11 +259,17 @@ sub problem_web_to_edit_header {
 	       $rndseed.'"
            onchange="javascript:document.lonhomework.changerandseed.click()" /></nobr>
              <label><input type="checkbox" name="showallfoils" ';
+    my $show_all_foils_text = 
+	($Apache::lonhomework::parsing_a_task) ?
+	&mt('&nbsp;Show&nbsp;All&nbsp;Instances')
+	: &mt('&nbsp;Show&nbsp;All&nbsp;Foils');
+
     if (defined($env{'form.showallfoils'})) { $result.='checked="on"'; }
-    $result.= ' />'.&mt('&nbsp;Show&nbsp;All&nbsp;Foils').
+    $result.= ' />'.$show_all_foils_text.
 	&Apache::loncommon::help_open_topic('Problem_Editor_Testing_Area','Testing Problems').
 	'</label><hr />';
-    $result.="
+    if (!$Apache::lonhomework::parsing_a_task) {
+	$result.="
 <nobr>
 Problem Status:
 <select name='problemstate'>
@@ -290,15 +300,16 @@ Feedback Mode:
 </nobr>
 <input type='submit' name='changeproblemmode' value='".&mt("Change")."' />
 <hr />";
-    my $numtoanalyze=$env{'form.numtoanalyze'};
-    if (!$numtoanalyze) { $numtoanalyze=20; }
-    $result.= '<input type="submit" name="problemmode" value='.
-	&mt('"Calculate answers').'" /> for
+	my $numtoanalyze=$env{'form.numtoanalyze'};
+	if (!$numtoanalyze) { $numtoanalyze=20; }
+	$result.= '<input type="submit" name="problemmode" value='.
+	    &mt('"Calculate answers').'" /> for
              <input type="text" name="numtoanalyze" value="'.
 	     $numtoanalyze.'" size="5" /> '.&mt('versions of this problem').
 	     '.'.&Apache::loncommon::help_open_topic("Analyze_Problem",
 						     '',undef,undef,300).
 						     '<hr />';
+    }
     return $result;
 }
 
@@ -425,16 +436,26 @@ ENDCHECKOUT
 sub init_problem_globals {
     my ($type)=@_;
     #initialize globals
+    #   For problems, we start out in part 0 (outside a <part> tag).
+    #   and part 0 is used to describe the main body of the <problem>
+    #
     if ($type eq 'problem') {
 	$Apache::inputtags::part='0';
 	@Apache::inputtags::partlist=('0');
 	$Apache::lonhomework::problemstatus=&get_problem_status('0');
 	$Apache::lonhomework::ignore_response_errors=0;
+
     } elsif ($type eq 'library') {
 	$Apache::inputtags::part='';
 	@Apache::inputtags::partlist=();
 	$Apache::lonhomework::problemstatus='';	
 	$Apache::lonhomework::ignore_response_errors=1;
+
+    } elsif ($type eq 'Task') {
+	$Apache::inputtags::part='0';
+	@Apache::inputtags::partlist=('0');
+	$Apache::lonhomework::problemstatus='';	
+	$Apache::lonhomework::ignore_response_errors=1;
     }
     @Apache::inputtags::responselist = ();
     @Apache::inputtags::importlist = ();
@@ -485,6 +506,12 @@ sub get_problem_status {
 sub start_problem {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
 
+    # We'll use the redirection to fix up printing of duedates.
+    &Apache::lonxml::startredirection();
+
+    # Problems don't nest and we don't allow more than one <problem> in
+    # a .problem file.
+    #
     if ( $Apache::inputtags::part ne '' ||
 	 $Apache::lonhomework::parsing_a_problem) {
 	&Apache::lonxml::error('Only one &lt;problem&gt; allowed in a .problem file');
@@ -510,7 +537,6 @@ sub start_problem {
 	    defined($env{'form.problemtype'})) {
 	    $Apache::lonhomework::type=$env{'form.problemtype'};
 	}
-	$Apache::lonhomework::default_type = $Apache::lonhomework::type;
 	&Apache::lonxml::debug("Found this to be of type :$Apache::ltonhomework::type:");
     }
     if ($Apache::lonhomework::type eq '' ) {
@@ -523,6 +549,7 @@ sub start_problem {
 	    &Apache::lonxml::debug("Using default type, problem, :$uri:");
 	}
     }
+    $Apache::lonhomework::default_type = $Apache::lonhomework::type;
 
     #added vars to the scripting enviroment
     my $expression='$external::part=\''.$Apache::inputtags::part.'\';';
@@ -565,11 +592,12 @@ sub start_problem {
                              value="'.$env{'form.username'}.'" />';
 	    if ($env{'user.adv'}) {
 		$form_tag_start.=
-		    ' <input type="checkbox" name="showallfoils" ';
+		    ' <label><input type="checkbox" name="showallfoils" ';
 		if (defined($env{'form.showallfoils'})) {
 		    $form_tag_start.='checked="on"';
 		}
-		$form_tag_start.= ' />'.&mt('&nbsp;Show&nbsp;All&nbsp;Foils');
+		$form_tag_start.= ' />'.&mt('&nbsp;Show&nbsp;All&nbsp;Foils').
+		    '</label>';
 	    }
 	    $form_tag_start.='<hr />';
 	}
@@ -643,27 +671,45 @@ sub start_problem {
 	    }
 	    my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
 	    if (defined($maxtries) && $maxtries < 0) { $allow_print_points=0; }
-	    my $duedate = &Apache::lonnet::EXT("resource.$id.duedate"); 
-	    $duedate = POSIX::strftime("%c",localtime($duedate));
+	    if (lc($env{'course.'.$env{'request.course.id'}.
+			    '.disableexampointprint'}) eq 'yes') {
+		$allow_print_points=0;
+	    }
+	    my $name_of_resourse= &Apache::lonxml::latex_special_symbols(&get_resource_name($parstack,$safeeval),'header');
+	    my $begin_doc='\begin{document} \typeout{STAMPOFPASSEDRESOURCESTART Resource <h2>"'.$name_of_resourse.'"</h2> located in <br /><small><b>'.$env{'request.uri'}.'</b></small><br /> STAMPOFPASSEDRESOURCEEND} \noindent ';
+	    my $toc_line='\vskip 1 mm\noindent '.$startminipage.
+		'\addcontentsline{toc}{subsection}{'.$name_of_resourse.'}';
+
+	    #  Figure out what the due date is and if we need to print
+	    #  it in the problem header.  We have been logging the
+	    #  last due date written to file. 
+
+	    my $duetime = &Apache::lonnet::EXT("resource.$id.duedate"); 
+	    my $duedate = POSIX::strftime("%c",localtime($duetime));
 	    my $temp_file;
 	    my $filename = "/home/httpd/prtspool/$env{'user.name'}_$env{'user.domain'}_printout.due";
+
+	    # Figure out what the last printed due date is or set it
+	    # to the epoch if no duedates have been printed.
+
+	    my $due_file_content = 0;      #   If the file does not yet exist, time is the epoch.
 	    if (-e $filename) {
 		$temp_file = Apache::File->new($filename);
-	    } 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 $name_of_resourse= &Apache::lonxml::latex_special_symbols(&get_resource_name($parstack,$safeeval),'header');
-	    if ($due_file_content ne $duedate) {
+		my @due_file      = <$temp_file>;
+		$due_file_content = $due_file[$#due_file];
+		chomp $due_file_content;
+	    } 
+
+	    # comparisons of the absolute times
+	    if ($due_file_content != $duetime) {
 		$temp_file = Apache::File->new('>'.$filename);
-		print $temp_file "$duedate\n";
+		print $temp_file "$duetime\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 '.$startminipage.'\addcontentsline{toc}{subsection}{'.$name_of_resourse.'}';	
+			$result .= $begin_doc.
+			    '\textit{Due date: '.$duedate.'} '.$toc_line;
 		    } 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.'\addcontentsline{toc}{subsection}{'.$name_of_resourse.'}';
+			$result .= $begin_doc.$toc_line;
 			if ($Apache::lonhomework::type eq 'exam' and $allow_print_points==1) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
 		    }
 		} else {
@@ -671,7 +717,7 @@ sub start_problem {
 		}
 	    } 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.'\addcontentsline{toc}{subsection}{'.$name_of_resourse.'}';	
+		    $result .= $begin_doc.$toc_line;
 		    if (($Apache::lonhomework::type eq 'exam') and ($allow_print_points==1)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
 		} else {
 		    $result .= '\vskip 1mm \\\\\\\\';
@@ -697,7 +743,8 @@ sub start_problem {
 
 sub end_problem {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
-    my $result='';
+    my $result= &Apache::lonxml::endredirection(); # started in &start_problem
+
     my $status=$Apache::inputtags::status['-1'];
     if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ||
 	$target eq 'tex') {
@@ -765,7 +812,7 @@ sub end_problem {
 	$result.=&Apache::response::meta_response_order();
     } elsif ($target eq 'edit') {
 	&Apache::lonxml::debug("in end_problem with $target, edit");
-	$result = &problem_edit_footer();
+	$result .= &problem_edit_footer();
     }
 
     if ($env{'request.state'} eq 'construct' && $target eq 'web') {
@@ -1048,7 +1095,9 @@ sub start_randomlist {
     if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
 	$target eq 'tex' || $target eq 'analyze') {
 	my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
-	my $b_parser= HTML::TokeParser->new(\$body);
+	my $b_parser= HTML::LCParser->new(\$body);
+	$b_parser->xml_mode(1);
+	$b_parser->marked_sections(1);
 	my $b_tok;
 	my @randomlist;
 	my $list_item;
@@ -1072,17 +1121,19 @@ sub start_randomlist {
 	    #  print "<b>END-TAG $b_tok->[1]</b><br />";
 	    # }
 	}
-	my @idx_arr = (0 .. $#randomlist);
-	&Apache::structuretags::shuffle(\@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[ $idx_arr[$_] ]";
+	if (@randomlist) {
+	    my @idx_arr = (0 .. $#randomlist);
+	    &Apache::structuretags::shuffle(\@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($parser,\$bodytext);
 	}
-	&Apache::lonxml::newparser($parser,\$bodytext);
     } elsif ($target eq 'edit' ) {
 	$result .=&Apache::edit::tag_start($target,$token);
 	$result .=&Apache::edit::text_arg('Maximum Tags to Show:','show',
@@ -1099,7 +1150,7 @@ sub start_randomlist {
 sub shuffle {
     my $a=shift;
     my $i;
-    if (defined(@$a)) {
+    if (ref($a) eq 'ARRAY' && @$a) {
 	&Apache::response::pushrandomnumber();
 	for($i=@$a;--$i;) {
 	    my $j=int(&Math::Random::random_uniform() * ($i+1));
@@ -1133,9 +1184,11 @@ sub ordered_show_check {
 
 sub start_part {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
+    &Apache::lonxml::startredirection(); # we'll use redirection to fix up 
+                                         # duedates.
     my $result='';
     my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
-    if ($id eq '') { $id = $Apache::lonxml::curdepth; }
+    if ($id =~ /^\s*$/) { $id = $Apache::lonxml::curdepth; }
     $Apache::inputtags::part=$id;
     push(@Apache::inputtags::partlist,$id);
     @Apache::inputtags::response=();
@@ -1205,6 +1258,10 @@ sub start_part {
 		    if (defined($maxtries) && $maxtries < 0) {
 			$allow_print_points=0;
 		    }
+		    if (lc($env{'course.'.$env{'request.course.id'}.
+				    '.disableexampointprint'}) eq 'yes') {
+			$allow_print_points=0;
+		    }
 		    if (($Apache::lonhomework::type eq 'exam') && ($allow_print_points)) { $result .= '\fbox{\textit{'.$weight.' pt}}';}
 		} elsif ($target eq 'web') {
 		    $result.='<a name="'.&Apache::lonnet::escape($Apache::inputtags::part).'" />';
@@ -1237,13 +1294,11 @@ sub end_part {
     my $status=$Apache::inputtags::status['-1'];
     my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
     my $in_order_show=&ordered_show_check();
-    my $result='';
-    if ( $target eq 'meta' ) {
-	$result='';
-    } elsif ($target eq 'grade') {
+    my $result= &Apache::lonxml::endredirection(); # started in &start_part
+    if ($target eq 'grade') {
 	if (($status eq 'CAN_ANSWER' || $Apache::lonhomework::scantronmode) &&
 	    !$hidden && $in_order_show) {
-	    $result=&Apache::inputtags::grade;
+	    $result.=&Apache::inputtags::grade;
 	} else {
 	    # move any submission data to .hidden
 	    &Apache::inputtags::hidealldata($Apache::inputtags::part);
@@ -1255,10 +1310,10 @@ sub end_part {
 	if ($Apache::lonhomework::type eq 'exam' && $target eq 'tex') {
 	    $gradestatus='';
 	}
-	$result=$gradestatus;
+	$result.=$gradestatus;
 	if ($$tagstack[-2] eq 'td' and $target eq 'tex') {$result.='\end{minipage}';} 
     } elsif ($target eq 'edit') {
-	$result=&Apache::edit::end_table();
+	$result.=&Apache::edit::end_table();
     }
     pop @Apache::inputtags::status;
     $Apache::inputtags::part='';
@@ -1270,7 +1325,8 @@ sub start_preduedate {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
 	&Apache::lonxml::debug("State in preduedate is ". $Apache::inputtags::status['-1']);
-	if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
+	if (!$Apache::lonhomework::scantronmode &&
+	    $Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
 	    $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER') {
 	    &Apache::lonxml::debug("Wha? ". ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER'));
 	    &Apache::lonxml::get_all_text("/preduedate",$parser);
@@ -1286,7 +1342,8 @@ sub end_preduedate {
 sub start_postanswerdate {
     my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
     if ($target eq 'web' || $target eq 'grade') {
-	if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
+	if ($Apache::lonhomework::scantronmode ||
+	    $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
 	    &Apache::lonxml::get_all_text("/postanswerdate",$parser);
 	}
     } elsif ($target eq 'tex') {