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Diff for /loncom/interface/lonnavmaps.pm between versions 1.59 and 1.92

version 1.59, 2002/10/01 19:15:22 version 1.92, 2002/10/29 20:20:45
Line 1 Line 1
   
 # The LearningOnline Network with CAPA  # The LearningOnline Network with CAPA
 # Navigate Maps Handler  # Navigate Maps Handler
 #  #
Line 44  use strict; Line 45  use strict;
 use Apache::Constants qw(:common :http);  use Apache::Constants qw(:common :http);
 use Apache::lonnet();  use Apache::lonnet();
 use Apache::loncommon();  use Apache::loncommon();
 use HTML::TokeParser;  
 use GDBM_File;  use GDBM_File;
   use POSIX qw (floor strftime);
   
 # -------------------------------------------------------------- Module Globals  # -------------------------------------------------------------- Module Globals
 my %hash;  my %hash;
Line 819  sub new_handle { Line 820  sub new_handle {
     &Apache::loncommon::no_cache($r);      &Apache::loncommon::no_cache($r);
     $r->send_http_header;      $r->send_http_header;
   
     # Header      # Create the nav map the nav map
     $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',  
                                           ''));  
     # Initialize the nav map  
     my $navmap = Apache::lonnavmaps::navmap->new(      my $navmap = Apache::lonnavmaps::navmap->new(
                         $ENV{"request.course.fn"}.".db",                          $ENV{"request.course.fn"}.".db",
                         $ENV{"request.course.fn"}."_parms.db", 1);                          $ENV{"request.course.fn"}."_parms.db", 1, 1);
   
   
     if (!defined($navmap)) {      if (!defined($navmap)) {
Line 834  sub new_handle { Line 832  sub new_handle {
         return HTTP_NOT_ACCEPTABLE;          return HTTP_NOT_ACCEPTABLE;
     }      }
   
       # Header
       $r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
                                             ''));
       $r->print('<script>window.focus();</script>');
       my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
       if (defined($desc)) { $r->print("<h2>$desc</h2>\n"); }
       my $date=localtime;
       $r->print("<h3>$date</h3>\n");
       $r->rflush();
       if ($navmap->{LAST_CHECK}) {
           $r->print('<img src="/adm/lonMisc/chat.gif"> New discussion since '.
                     strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})).
                     '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'); 
       } else {
           $r->print('<img src="/adm/lonMisc/chat.gif"> Discussions'.
                     '<br><img src="/adm/lonMisc/feedback.gif"> New message (click to open)<p>'); 
       }
   
       # Now that we've displayed some stuff to the user, init the navmap
       $navmap->init();
   
     # Check that it's defined      # Check that it's defined
     if (!($navmap->courseMapDefined())) {      if (!($navmap->courseMapDefined())) {
         $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .          $r->print('<font size="+2" color="red">Coursemap undefined.</font>' .
Line 860  sub new_handle { Line 879  sub new_handle {
       $res->NOTHING_SET            => ''        );        $res->NOTHING_SET            => ''        );
     # And a special case in the nav map; what to do when the assignment      # And a special case in the nav map; what to do when the assignment
     # is not yet done and due in less then 24 hours      # is not yet done and due in less then 24 hours
     my $hurryUpColor = "#FFCCCC";      my $hurryUpColor = "#FF0000";
   
     my %statusIconMap =       my %statusIconMap = 
  ( $res->NETWORK_FAILURE    => '',          ( $res->NETWORK_FAILURE    => '',
   $res->NOTHING_SET        => '',            $res->NOTHING_SET        => '',
   $res->CORRECT            => 'navmap.correct.gif',            $res->CORRECT            => 'navmap.correct.gif',
   $res->EXCUSED            => 'navmap.correct.gif',            $res->EXCUSED            => 'navmap.correct.gif',
   $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',            $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif',
   $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',            $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif',
   $res->ANSWER_OPEN        => 'navmap.wrong.gif',            $res->ANSWER_OPEN        => 'navmap.wrong.gif',
   $res->OPEN_LATER         => '',            $res->OPEN_LATER         => '',
   $res->TRIES_LEFT         => 'navmap.open.gif',            $res->TRIES_LEFT         => 'navmap.open.gif',
   $res->INCORRECT          => 'navmap.wrong.gif',            $res->INCORRECT          => 'navmap.wrong.gif',
   $res->OPEN               => 'navmap.open.gif' );            $res->OPEN               => 'navmap.open.gif',
             $res->ATTEMPTED          => 'navmap.open.gif' );
   
       my %iconAltTags = 
           ( 'navmap.correct.gif' => 'Correct',
             'navmap.wrong.gif'   => 'Incorrect',
             'navmap.open.gif'    => 'Open' );
   
     my %condenseStatuses =      my %condenseStatuses =
  ( $res->NETWORK_FAILURE    => 1,          ( $res->NETWORK_FAILURE    => 1,
   $res->NOTHING_SET        => 1,            $res->NOTHING_SET        => 1,
   $res->CORRECT            => 1,            $res->CORRECT            => 1 );
   $res->OPEN               => 1 );  
   
     my %filterHash;      my %filterHash;
     # Figure out what we're not displaying      # Figure out what we're not displaying
Line 889  sub new_handle { Line 913  sub new_handle {
         }          }
     }      }
   
       # Is this a new-style course? If so, we want to suppress showing the top-level
       # maps in their own folders, in favor of "inlining" them.
       my $topResource = $navmap->getById("0.0");
       my $inlineTopLevelMaps = $topResource->src() =~ m|^/uploaded/.*default\.sequence$|;
   
       my $currenturl = $ENV{'form.postdata'};
       $currenturl=~s/^http\:\/\///;
       $currenturl=~s/^[^\/]+//;
       # alreadyHere allows us to only open the maps necessary to view
       # the current location once, while at the same time remembering
       # the current location. Without that check, the user would never
       # be able to close those maps; the user would close it, and the
       # currenturl scan would re-open it.
       my $queryAdd = "postdata=" . &Apache::lonnet::escape($currenturl) .
           "&alreadyHere=1";
   
       my $condition = 0;
       if ($ENV{'form.condition'}) {
           $condition = 1;
       }
   
       if ($condition) {
           $r->print('<a href="navmaps?condition=0&filter=">Close All Folders</a><br /><br />');
       } else {
           $r->print('<a href="navmaps?condition=1&filter=">Open All Folders</a><br /><br />');
       }
   
     # Begin the HTML table      # Begin the HTML table
     # four cols: resource + indent, chat+feedback, icon, text string      # four cols: resource + indent, chat+feedback, icon, text string
     $r->print('<table cellspacing="3" cellpadding="0" bgcolor="#FFFFFF">' ."\n");      $r->print('<table cellspacing="0" cellpadding="3" border="0" bgcolor="#FFFFFF">' ."\n");
   
     my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash);      # This needs to be updated to use symbs from the remote, 
       # instead of uris. The changes to this and the main rendering
       # loop should be obvious.
       # Here's a simple example of the iterator.
       # Preprocess the map: Look for current URL, force inlined maps to display
   
       my $mapIterator = $navmap->getIterator(undef, undef, {}, 1);
       my $found = 0;
       my $depth = 1;
       my $currentUrlIndex = 0; # keeps track of when the current resource is found,
                                # so we can back up a few and put the anchor above the
                                # current resource
       $mapIterator->next(); # discard the first BEGIN_MAP
     my $curRes = $mapIterator->next();      my $curRes = $mapIterator->next();
       my $counter = 0;
       
       while ($depth > 0) {
           if ($curRes == $mapIterator->BEGIN_MAP()) {
               $depth++;
           }
           if ($curRes == $mapIterator->END_MAP()) {
               $depth--;
           }
   
           if (ref($curRes)) { $counter++; }
   
           my $mapStack = $mapIterator->getStack();
           if ($currenturl && !$ENV{'form.alreadyHere'} && ref($curRes) && 
               $curRes->src() eq $currenturl) {
               # If this is the correct resource, be sure to 
               # show it by making sure the containing maps
               # are open.
   
               $currentUrlIndex = $counter;
               
               for my $map (@{$mapStack}) {
                   if ($condition) {
                       undef $filterHash{$map->map_pc()};
                   } else {
                       $filterHash{$map->map_pc()} = 1;
                   }
               }
               $ENV{'form.alreadyHere'} = 1;
           }
               
           # Preprocessing: If we're inlining nav maps into the top-level display,
           # make sure we show this map!
           if ($inlineTopLevelMaps && ref($curRes) && $curRes->is_map && 
               scalar(@{$mapStack}) == 1) {
               if ($condition) {
                   undef $filterHash{$curRes->map_pc()};
               } else {
                   $filterHash{$curRes->map_pc()} = 1;
               }
           }
   
           $curRes = $mapIterator->next();
       }
       
     undef $res; # so we don't accidentally use it later      undef $res; # so we don't accidentally use it later
     my $indentLevel = -1;      my $indentLevel = 0;
     my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\"/>";      my $indentString = "<img src=\"/adm/lonIcons/whitespace1.gif\" width=\"25\" height=\"1\" alt=\"\" border=\"0\" />";
   
     my $isNewBranch = 0;      my $isNewBranch = 0;
     my $now = time();      my $now = time();
     my $in24Hours = $now + 24 * 60 * 60;      my $in24Hours = $now + 24 * 60 * 60;
       my $displayedHereMarker = 0;
       
       # We know the first thing is a BEGIN_MAP (see "$self->{STARTED}"
       # code in iterator->next), so ignore the first one
       $mapIterator = $navmap->getIterator(undef, undef, \%filterHash,
                                              $condition);
       $mapIterator->next();
       $curRes = $mapIterator->next();
       my $deltadepth = 0;
       $depth = 1;
   
       my @backgroundColors = ("#FFFFFF", "#F6F6F6");
       my $rowNum = 0;
   
       $counter = 0;
   
       while ($depth > 0) {
           # If we're in a new style course, and this is a BEGIN_MAP, END_MAP, or
           # map resource and the stack depth is only one, just plain ignore this resource
           # entirely. (This has the effect of inlining the resources in that map
           # in the nav map.)
           if ($inlineTopLevelMaps && scalar(@{$mapIterator->getStack()}) == 1 &&
               ref($curRes) && $curRes->is_map()) {
               # We let the normal depth stuff occur, but we need to shift everything
               # over by one to the left to make it look right.
               $deltadepth = -1;
               $curRes = $mapIterator->next();
               next;
           }
   
     while ($curRes != $mapIterator->END_NAV_MAP) {  
         if ($curRes == $mapIterator->BEGIN_MAP() ||          if ($curRes == $mapIterator->BEGIN_MAP() ||
             $curRes == $mapIterator->BEGIN_BRANCH()) {              $curRes == $mapIterator->BEGIN_BRANCH()) {
             $indentLevel++;              $indentLevel++;
Line 915  sub new_handle { Line 1051  sub new_handle {
         if ($curRes == $mapIterator->BEGIN_BRANCH()) {          if ($curRes == $mapIterator->BEGIN_BRANCH()) {
             $isNewBranch = 1;              $isNewBranch = 1;
         }          }
           if ($curRes == $mapIterator->BEGIN_MAP()) {
               $depth++;
           }
           if ($curRes == $mapIterator->END_MAP()) {
               $depth--;
           }
   
           if (ref($curRes)) { $counter++; }
   
           if ($depth == 1) { $deltadepth = 0; } # we're done shifting, because we're
                                                 # out of the inlined map
   
           # Is this resource being blotted out?
           if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
               $curRes = $mapIterator->next();
               next; # and totally ignore this resource
           }
   
         if (ref($curRes) && $curRes->src()) {          if (ref($curRes) && $curRes->src()) {
   
     # Step one: Decide which parts to show              # Step one: Decide which parts to show
             my @parts;              my @parts = @{$curRes->parts()};
               my $multipart = scalar(@parts) > 1;
               my $condensed = 0;
                   
             if ($curRes->is_problem()) {              if ($curRes->is_problem()) {
  # Is it multipart?                  # Is it multipart?
                 @parts = @{$curRes->parts()};  
   
  my $multipart = scalar(@parts) > 1;                  if ($multipart) {
                       # If it's multipart, see if part 0 is "open"
  if ($multipart) {                      # if it is, display all parts, if it isn't,
     # If it's multipart, see if part 0 is "open"                      # just display first
     # if it is, display all parts, if it isn't,                      if (!$curRes->opendate("0")) {
     # just display first                          @parts = ("0"); # just display the zero-th part
     if (!$curRes->opendate("0")) {                          $condensed = 1;
  @parts = ("0"); # just display the zero-th part                      } else {
     } else {                          # Otherwise, only display part 0 if we want to 
  # Otherwise, only display part 0 if we want to                           # attach feedback or email information to it
  # attach feedback or email information to it                          if ($curRes->hasDiscussion() || $curRes->getFeedback()) {
  if (!$curRes->hasDiscussion() && !$curRes->getFeedback()) {                              shift @parts;
     shift @parts;                          } else {
  } else {                              # If there's discussion or feedback, that counts
     # If there's discussion or feedback, that counts                              # as a difference, so display the parts.
     # as a difference, so display the parts.                              
                                   # Now, we decide whether to condense the
     # Now, we decide whether to condense the                              # parts due to similarity
     # parts due to similarity                              my $status = $curRes->status($parts[1]);
     my $status = $curRes->status($parts[0]);                              my $due = $curRes->duedate($parts[1]);
     my $allSame = 1;                              my $open = $curRes->opendate($parts[1]);
     for (my $i = 1; $i < scalar(@parts); $i++) {                              my $statusAllSame = 1;
  if ($curRes->status($parts[$i]) != $status){                              my $dueAllSame = 1;
     $allSame = 0;                              my $openAllSame = 1;
  }                              for (my $i = 2; $i < scalar(@parts); $i++) {
     }                                  if ($curRes->status($parts[$i]) != $status){
                                           $statusAllSame = 0;
     # $allSame is true if all the statuses were                                  }
     # the same. Now, if they are all the same and                                  if ($curRes->duedate($parts[$i]) != $due ) {
     # match one of the statuses to condense, then                                      $dueAllSame = 0;
     # only display part 0.                                  }
     if ($allSame && defined($condenseStatuses{$status})){                                  if ($curRes->opendate($parts[$i]) != $open) {
  @parts = ("0");                                      $openAllSame = 0;
     }                                  }
  }                              }
     }                              
  }                              # $allSame is true if all the statuses were
                               # the same. Now, if they are all the same and
                               # match one of the statuses to condense, or they
                               # are all open with the same due date, or they are
                               # all OPEN_LATER with the same open date, display the
                               # status of the first non-zero part (to get the 'correct'
                               # status right, since 0 is never 'correct' or 'open').
                               if (($statusAllSame && defined($condenseStatuses{$status})) ||
                                   ($dueAllSame && $status == $curRes->OPEN && $statusAllSame)||
                                   ($openAllSame && $status == $curRes->OPEN_LATER && $statusAllSame) ){
                                   @parts = ($parts[1]);
                                   $condensed = 1;
                               }
                           }
                       }
                   }
   
             } else {              } else {
                 @parts[0] = "0"; # this is to get past foreach loop below                  $parts[0] = "0"; # this is to get past foreach loop below
                  # you can consider a non-problem resource as a resource                   # you can consider a non-problem resource as a resource
                  # with only one part without loss                    # with only one part without loss
               }
   
               # Is it a multipart problem with a single part, now in 
               # @parts with "0" filtered out? If so, forget it's a multi-part
               # problem and treat it like a single-part problem.
               if ( scalar(@parts) == 1 ) {
                   $multipart = 0;
             }              }
   
     # Step two: Show the parts              # Display one part, in event of network error.
               # If this is a single part, we can at least show the correct
               # status, but if it's multipart, we're lost.
               if ($curRes->{RESOURCE_ERROR}) {
                   @parts = ("0");
               }
   
               # Step two: Show the parts
             foreach my $part (@parts) {              foreach my $part (@parts) {
   
  my $deltalevel = 0; # for inserting the branch icon                  my $deltalevel = 0; # for inserting the branch icon
                   my $nonLinkedText = ""; # unlinked stuff after title
                                   
                 # For each thing we're displaying...                  # For each thing we're displaying...
   
Line 984  sub new_handle { Line 1169  sub new_handle {
                     'symb='.&Apache::lonnet::escape($curRes->symb()).                      'symb='.&Apache::lonnet::escape($curRes->symb()).
                     '"';                      '"';
                 my $title = $curRes->title();                  my $title = $curRes->title();
                   if (!$title) {
                       $title = $curRes->src();
                       $title = substr ($title, rindex($title, "/") + 1);
                   }
                 my $partLabel = "";                  my $partLabel = "";
                 my $newBranchText = "";                  my $newBranchText = "";
   
Line 992  sub new_handle { Line 1181  sub new_handle {
                 if ($isNewBranch) {                  if ($isNewBranch) {
                     $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";                      $newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
                     $isNewBranch = 0;                      $isNewBranch = 0;
     $deltalevel = 1;                      $deltalevel = 1;
                 }                  }
   
                 # links to open and close the folders                  # links to open and close the folders
                 my $linkopen = "<a href=\"$link\">";                  my $linkopen = "<a href=\"$link\">";
                 my $linkclose = "</a>";                  my $linkclose = "</a>";
   
                 my $icon = "html.gif";                  my $icon = "<img src=\"/adm/lonIcons/html.gif\" alt=\"\" border=\"0\" />";
                 if ($curRes->is_problem()) {                   if ($curRes->is_problem()) { 
                     $icon = "problem.gif";                       if ($part eq "0" || $condensed) {
                           $icon = '<img src="/adm/lonIcons/problem.gif" alt="" border=\"0\" />'; 
                       } else {
                           $icon = $indentString;
                       }
                 }                  }
   
                 # Display the correct icon, link to open or shut map                  # Display the correct icon, link to open or shut map
                 if ($curRes->is_map()) {                   if ($curRes->is_map()) { 
                     my $mapId = $curRes->map_pc();                      my $mapId = $curRes->map_pc();
                     my $nowOpen = !defined($filterHash{$mapId});                      my $nowOpen = (!defined($filterHash{$mapId}));
                       if ($condition) {$nowOpen = !$nowOpen;}
                     $icon = $nowOpen ?                      $icon = $nowOpen ?
                         "folder_opened.gif" : "folder_closed.gif";                          "navmap.folder.closed.gif" : "navmap.folder.open.gif";
                       $icon = "<img src=\"/adm/lonIcons/$icon\" alt=\"\" border=\"0\" />";
                     $linkopen = "<a href=\"/adm/navmaps?filter=";                      $linkopen = "<a href=\"/adm/navmaps?filter=";
                     $linkopen .= $nowOpen ?                       $linkopen .= ($nowOpen xor $condition) ? 
                         addToFilter(\%filterHash, $mapId) :                          addToFilter(\%filterHash, $mapId) :
                         removeFromFilter(\%filterHash, $mapId);                          removeFromFilter(\%filterHash, $mapId);
                     $linkopen .= "\">";                      $linkopen .= "&condition=$condition&$queryAdd\">";
                     $linkclose = "</a>";                      $linkclose = "</a>";
                       
                 }                  }
                                   
                 my $colorizer = "";                  my $colorizer = "";
                   my $color;
                 if ($curRes->is_problem()) {                  if ($curRes->is_problem()) {
                     my $status = $curRes->status($part);                      my $status = $curRes->status($part);
                     my $color = $colormap{$status};                      $color = $colormap{$status};
   
                       # Special case in the navmaps: If in less then
                       # 24 hours, give it a bit of urgency
                       if (($status == $curRes->OPEN() || $status == $curRes->ATTEMPTED() ||
                            $status == $curRes->TRIES_LEFT())
                           && $curRes->duedate() &&
                           $curRes->duedate() < time()+(24*60*60) && 
                           $curRes->duedate() > time()) {
                           $color = $hurryUpColor;
                       }
                       # Special case: If this is the last try, and there is
                       # more then one available, and it's not due yet, give a bit of urgency
                       my $tries = $curRes->tries($part);
                       my $maxtries = $curRes->maxtries($part);
                       if ($tries && $maxtries && $maxtries > 1 &&
                           $maxtries - $tries == 1 && $curRes->duedate() &&
                           $curRes->duedate() > time()) {
                           $color = $hurryUpColor;
                       }
                     if ($color ne "") {                      if ($color ne "") {
                         $colorizer = "bgcolor=\"$color\"";                          $colorizer = "bgcolor=\"$color\"";
                     }                      }
                 }                  }
   
  # FIRST ROW: The resource indentation, branch icon, and name                  if ($curRes->randomout()) {
                 $r->print("  <tr><td align=\"left\" valign=\"top\">\n");                      $nonLinkedText .= ' <i>(hidden)</i> ';
                   }
   
                   $rowNum++;
                   my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)];
   
                   # FIRST COL: The resource indentation, branch icon, name, and anchor
                   $r->print("  <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");
   
                   # anchor for current resource... - 5 is deliberate: If it's that
                   # high on the screen, don't bother focusing on it. Also this will
                   # print multiple anchors if this is an expanded multi-part problem...
                   # who cares?
                   if ($counter == $currentUrlIndex - 5) {
                       $r->print('<a name="current" />');
                   }
   
                 # print indentation                  # print indentation
                 for (my $i = 0; $i < $indentLevel - $deltalevel; $i++) {                  for (my $i = 0; $i < $indentLevel - $deltalevel + $deltadepth; $i++) {
                     $r->print($indentString);                      $r->print($indentString);
                 }                  }
   
                 $r->print("  ${newBranchText}${linkopen}<img border=\"0\" src=\"" .                  $r->print("  ${newBranchText}${linkopen}$icon${linkclose}\n");
                           "/adm/lonIcons/$icon\" alt=\"\">${linkclose}\n");  
                   my $curMarkerBegin = "";
                   my $curMarkerEnd = "";
   
                   # Is this the current resource?
                   if ($curRes->src() eq $currenturl && !$displayedHereMarker) {
                       $curMarkerBegin = '<a name="curloc" /><font color="red" size="+2">&gt; </font>';
                       $curMarkerEnd = '<font color="red" size="+2"> &lt;</font>';
                       $displayedHereMarker = 1;
                   }
   
                   if ($curRes->is_problem() && $part ne "0" && !$condensed) { 
                       $partLabel = " (Part $part)"; 
                       $title = "";
                   }
                   if ($multipart && $condensed) {
                       $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)';
                   }
   
                   $r->print("  $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");
   
                   if ($curRes->{RESOURCE_ERROR}) {
                       $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
                                                 '<font size="-1">Host down</font>'));
                       }
   
                 if ($curRes->is_problem() && $part != "0") { $partLabel = " (Part $part)"; }                  my $discussionHTML = ""; my $feedbackHTML = "";
   
                 $r->print("  <a href=\"$link\">$title$partLabel</a></td>");                  # SECOND COL: Is there text, feedback, errors??
                   if ($curRes->hasDiscussion()) {
                       $discussionHTML = $linkopen .
                           '<img border="0" src="/adm/lonMisc/chat.gif" />' .
                           $linkclose;
                   }
   
                   if ($curRes->getFeedback()) {
                       my $feedback = $curRes->getFeedback();
                       foreach (split(/\,/, $feedback)) {
                           if ($_) {
                               $feedbackHTML .= '&nbsp;<a href="/adm/email?display='
                                   . &Apache::lonnet::escape($_) . '">'
                                   . '<img src="/adm/lonMisc/feedback.gif" '
                                   . 'border="0" /></a>';
                           }
                       }
                   }
   
  my $discussionHTML = ""; my $feedbackHTML = "";                  $r->print("<td width=\"75\" align=\"left\" valign=\"center\">$discussionHTML$feedbackHTML&nbsp;</td>");
   
  # SECOND ROW: Is there text or feedback?                  # Is this the first displayed part of a multi-part problem
  if ($curRes->hasDiscussion()) {                  # that has not been condensed, so we should suppress these two
     $discussionHTML = $linkopen .                  # columns?
  '<img border="0" src="/adm/lonMisc/chat.gif" />' .                  my $firstDisplayed = !$condensed && $multipart && $part eq "0";
  $linkclose;  
  }                  # THIRD COL: Problem status icon
                   if ($curRes->is_problem() &&
  if ($curRes->getFeedback()) {                      !$firstDisplayed) {
     my $feedback = $curRes->getFeedback();                      my $icon = $statusIconMap{$curRes->status($part)};
     foreach (split(/\,/, $feedback)) {                      my $alt = $iconAltTags{$icon};
  if ($_) {                      if ($icon) {
     $feedbackHTML .= '&nbsp;<a href="/adm/email?display='                          $r->print("<td width=\"30\" valign=\"center\" width=\"50\" align=\"right\">$linkopen<img width=\"25\" height=\"25\" src=\"/adm/lonIcons/$icon\" border=\"0\" alt=\"$alt\" />$linkclose</td>\n");
  . &Apache::lonnet::escape($_) . '">'                      } else {
  . '<img src="/adm/lonMisc/feedback.gif" '                          $r->print("<td width=\"30\">&nbsp;</td>\n");
  . 'border="0" /></a>';                      }
  }                  } else { # not problem, no icon
     }                      $r->print("<td width=\"30\">&nbsp;</td>\n");
  }                  }
   
  $r->print("<td align=\"left\">$discussionHTML$feedbackHTML</td>");  
   
  # THIRD ROW: Problem status icon  
  if ($curRes->is_problem()) {  
     my $icon = $statusIconMap{$curRes->status()};  
     if ($icon) {  
  $r->print("<td width=\"50\" align=\"right\">$linkopen<img src=\"/adm/lonIcons/$icon\" border=\"0\" />$linkclose</td>\n");  
     } else {  
  $r->print("<td></td>\n");  
     }  
  } else { # not problem, no icon  
     $r->print("<td></td>\n");  
  }  
   
   # FOURTH ROW: Text description                  # FOURTH COL: Text description
  $r->print("<td $colorizer align=\"right\">\n");                  #$r->print("<td $colorizer align=\"right\" valign=\"center\">\n");
                   $r->print("<td align=\"right\" valign=\"center\">\n");
                                   
                 if ($curRes->kind() eq "res" and                   if ($curRes->kind() eq "res" &&
                     $curRes->is_problem() ) {                      $curRes->is_problem() &&
                       !$firstDisplayed) {
                       $r->print ("<font color=\"$color\"><b>") if ($color);
                     $r->print (getDescription($curRes, $part));                      $r->print (getDescription($curRes, $part));
                       $r->print ("</b></font>") if ($color);
                   }
                   if ($curRes->is_map() && advancedUser() && $curRes->randompick()) {
                       $r->print('(randomly select ' . $curRes->randompick() .')');
                 }                  }
   
  $r->print("</td></tr>\n");                  $r->print("&nbsp;</td></tr>\n");
             }              }
         }          }
         $curRes = $mapIterator->next();          $curRes = $mapIterator->next();
Line 1154  sub getLinkForResource { Line 1418  sub getLinkForResource {
 sub getDescription {  sub getDescription {
     my $res = shift;      my $res = shift;
     my $part = shift;      my $part = shift;
     my $status = $res->getDateStatus();      my $status = $res->status($part);
   
     if ($status == $res->NETWORK_FAILURE) { return ""; }      if ($status == $res->NETWORK_FAILURE) { return ""; }
     if ($status == $res->NOTHING_SET) {      if ($status == $res->NOTHING_SET) {
         return "Not currently assigned.";          return "Not currently assigned.";
     }      }
     if ($status == $res->OPEN_LATER) {      if ($status == $res->OPEN_LATER) {
         return "Opens: " . timeToHumanString($res->opendate($part));          return "Open " . timeToHumanString($res->opendate($part));
     }      }
     if ($status == $res->OPEN) {      if ($status == $res->OPEN) {
  if ($res->duedate()) {          if ($res->duedate($part)) {
     return "Due: $status " . timeToHumanString($res->duedate($part));              return "Due " . timeToHumanString($res->duedate($part));
  } else {          } else {
     return "Open, no due date";              return "Open, no due date";
  }          }
     }      }
     if ($status == $res->PAST_DUE_ANSWER_LATER) {      if ($status == $res->PAST_DUE_ANSWER_LATER) {
         return "Answer opens: " . timeToHumanString($res->answerdate($part));          return "Answer open " . timeToHumanString($res->answerdate($part));
     }      }
     if ($status == $res->PAST_DUE_NO_ANSWER) {      if ($status == $res->PAST_DUE_NO_ANSWER) {
         return "Was Due: " . timeToHumanString($res->duedate($part));          return "Was due " . timeToHumanString($res->duedate($part));
     }      }
     if ($status == $res->ANSWER_OPEN) {      if ($status == $res->ANSWER_OPEN) {
         return "Answer available";          return "Answer available";
     }      }
     if ($status == $res->EXCUSED) {      if ($status == $res->EXCUSED) {
  return "Excused by instructor";          return "Excused by instructor";
       }
       if ($status == $res->ATTEMPTED) {
           return "Not yet graded.";
     }      }
     if ($status == $res->TRIES_LEFT) {      if ($status == $res->TRIES_LEFT) {
  my $tries = $res->tries();          my $tries = $res->tries($part);
  my $maxtries = $res->maxtries();          my $maxtries = $res->maxtries($part);
  my $triesString = "($tries of $maxtries tries used)";          my $triesString = "";
  if ($res->duedate()) {          if ($tries && $maxtries) {
     return "Due: $status " . timeToHumanString($res->duedate($part)) .              $triesString = "<font size=\"-1\"><i>($tries of $maxtries tries used)</i></font>";
  " $triesString";              if ($maxtries > 1 && $maxtries - $tries == 1) {
  } else {                  $triesString = "<b>$triesString</b>";
     return "No due date $triesString";              }
  }          }
           if ($res->duedate()) {
               return "Due " . timeToHumanString($res->duedate($part)) .
                   " $triesString";
           } else {
               return "No due date $triesString";
           }
     }      }
 }  }
   
 # I want to change this into something more human-friendly. For  sub advancedUser {
 # now, this is a simple call to localtime. The final function      return $ENV{'user.adv'};
 # probably belongs in loncommon.  }
   
   
   # timeToHumanString takes a time number and converts it to a
   # human-readable representation, meant to be used in the following
   # manner:
   # print "Due $timestring"
   # print "Open $timestring"
   # print "Answer available $timestring"
   # Very, very, very, VERY English-only... goodness help a localizer on
   # this func...
 sub timeToHumanString {  sub timeToHumanString {
     my ($time) = @_;      my ($time) = @_;
     # zero, '0' and blank are bad times      # zero, '0' and blank are bad times
     if ($time) {      if (!$time) {
  return localtime($time);          return 'never';
     } else {      }
  return 'Never';  
       my $now = time();
   
       my @time = localtime($time);
       my @now = localtime($now);
   
       # Positive = future
       my $delta = $time - $now;
   
       my $minute = 60;
       my $hour = 60 * $minute;
       my $day = 24 * $hour;
       my $week = 7 * $day;
       my $inPast = 0;
   
       # Logic in comments:
       # Is it now? (extremely unlikely)
       if ( $delta == 0 ) {
           return "this instant";
       }
   
       if ($delta < 0) {
           $inPast = 1;
           $delta = -$delta;
       }
   
       # Is it in the future?
       if ( $delta > 0 ) {
           # Is it less then a minute away?
           my $tense = $inPast ? " ago" : "";
           my $prefix = $inPast ? "" : "in ";
           if ( $delta < $minute ) {
               if ($delta == 1) { return "${prefix}1 second$tense"; }
               return "$prefix$delta seconds$tense";
           }
   
           # Is it less then an hour away?
           if ( $delta < $hour ) {
               # If so, use minutes
               my $minutes = floor($delta / 60);
               if ($minutes == 1) { return "${prefix}1 minute$tense"; }
               return "$prefix$minutes minutes$tense";
           }
           
           # Is it less then 24 hours away? If so,
           # display hours + minutes
           if ( $delta < $hour * 24) {
               my $hours = floor($delta / $hour);
               my $minutes = floor(($delta % $hour) / $minute);
               my $hourString = "$hours hours";
               my $minuteString = ", $minutes minutes";
               if ($hours == 1) {
                   $hourString = "1 hour";
               }
               if ($minutes == 1) {
                   $minuteString = ", 1 minute";
               }
               if ($minutes == 0) {
                   $minuteString = "";
               }
               return "$prefix$hourString$minuteString$tense";
           }
   
           # Less then 5 days away, display day of the week and
           # HH:MM
           if ( $delta < $day * 5 ) {
               my $timeStr = strftime("%A, %b %e at %I:%M %P", localtime($time));
               $timeStr =~ s/12:00 am/midnight/;
               $timeStr =~ s/12:00 pm/noon/;
               return ($inPast ? "last " : "next ") .
                   $timeStr;
           }
           
           # Is it this year?
           if ( $time[5] == $now[5]) {
               # Return on Month Day, HH:MM meridian
               my $timeStr = strftime("on %A, %b %e at %I:%M %P", localtime($time));
               $timeStr =~ s/12:00 am/midnight/;
               $timeStr =~ s/12:00 pm/noon/;
               return $timeStr;
           }
   
           # Not this year, so show the year
           my $timeStr = strftime("on %A, %b %e %G at %I:%M %P", localtime($time));
           $timeStr =~ s/12:00 am/midnight/;
           $timeStr =~ s/12:00 pm/noon/;
           return $timeStr;
     }      }
 }  }
   
Line 1212  sub timeToHumanString { Line 1581  sub timeToHumanString {
   
 package Apache::lonnavmaps::navmap;  package Apache::lonnavmaps::navmap;
   
 # LEFT:  
 # * Actual handler code (multi-part)  
 # * Branches (aieee!) (and conditionals)  
   
 =pod  =pod
   
 lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.  lonnavmaps provides functions and objects for dealing with the compiled course hashes generated when a user enters the course, and also provides the Apache handler for the "Navigation Map" button.
Line 1232  You must obtain resource objects through Line 1597  You must obtain resource objects through
   
 =over 4  =over 4
   
 =item * B<new>(filename, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled course representation and parmHashFile. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.  =item * B<new>(navHashFile, parmHashFile, genCourseAndUserOptions, genMailDiscussStatus): Binds a new navmap object to the compiled nav map hash and parm hash given as filenames. genCourseAndUserOptions is a flag saying whether the course options and user options hash should be generated. This is for when you are using the parameters of the resources that require them; see documentation in resource object documentation. genMailDiscussStatus causes the nav map to retreive information about the email and discussion status of resources. Returns the navmap object if this is successful, or B<undef> if not. You must check for undef; errors will occur when you try to use the other methods otherwise.
   
 =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.  =item * B<getIterator>(first, finish, filter, condition): See iterator documentation below.
   
Line 1272  sub new { Line 1637  sub new {
     if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},      if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE},
               &GDBM_READER(), 0640)))                &GDBM_READER(), 0640)))
     {      {
           untie $self->{PARM_HASH};
         return undef;          return undef;
     }      }
     $self->{PARM_HASH} = \%parmhash;      $self->{PARM_HASH} = \%parmhash;
     $self->{HASH_TIED} = 1;      $self->{HASH_TIED} = 1;
   
       bless($self);
           
       return $self;
   }
   
   sub init {
       my $self = $self;
   
     # If the course opt hash and the user opt hash should be generated,      # If the course opt hash and the user opt hash should be generated,
     # generate them      # generate them
     if ($self->{GENERATE_COURSE_USER_OPT}) {      if ($self->{GENERATE_COURSE_USER_OPT}) {
Line 1379  sub new { Line 1753  sub new {
         $self->{EMAIL_STATUS} = \%emailstatus;          $self->{EMAIL_STATUS} = \%emailstatus;
                   
     }          }    
       
     bless($self);      $self->{PARM_CACHE} = {};
           
     return $self;  
 }  }
   
 # Checks to see if coursemap is defined, matching test in old lonnavmaps  # Checks to see if coursemap is defined, matching test in old lonnavmaps
Line 1398  sub courseMapDefined { Line 1770  sub courseMapDefined {
 sub getIterator {  sub getIterator {
     my $self = shift;      my $self = shift;
     my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,      my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
                                                      shift, shift);                                                       shift, undef, shift, 
                                                        $ENV{'form.direction'});
     return $iterator;      return $iterator;
 }  }
   
 # unties the hash when done  # unties the hash when done
 sub untieHashes {  sub untieHashes {
     my $self = shift;      my $self = shift;
     untie $self->{NAV_HASH} if ($self->{HASH_TIED});      untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED});
     untie $self->{PARM_HASH} if ($self->{HASH_TIED});      untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED});
     $self->{HASH_TIED} = 0;      $self->{HASH_TIED} = 0;
 }  }
   
Line 1424  sub hasDiscussion { Line 1797  sub hasDiscussion {
     if (!defined($self->{DISCUSSION_TIME})) { return 0; }      if (!defined($self->{DISCUSSION_TIME})) { return 0; }
   
     return $self->{DISCUSSION_TIME}->{$symb} >      return $self->{DISCUSSION_TIME}->{$symb} >
    $self->{LAST_CHECK};             $self->{LAST_CHECK};
 }  }
   
 # Private function: Does the given resource (as a symb string) have  # Private function: Does the given resource (as a symb string) have
Line 1500  sub finishResource { Line 1873  sub finishResource {
 sub parmval {  sub parmval {
     my $self = shift;      my $self = shift;
     my ($what,$symb)=@_;      my ($what,$symb)=@_;
       my $hashkey = $what."|||".$symb;
   
       if (defined($self->{PARM_CACHE}->{$hashkey})) {
           return $self->{PARM_CACHE}->{$hashkey};
       }
   
       my $result = $self->parmval_real($what, $symb);
       $self->{PARM_CACHE}->{$hashkey} = $result;
       return $result;
   }
   
   sub parmval_real {
       my $self = shift;
       my ($what,$symb) = @_;
   
     my $cid=$ENV{'request.course.id'};      my $cid=$ENV{'request.course.id'};
     my $csec=$ENV{'request.course.sec'};      my $csec=$ENV{'request.course.sec'};
     my $uname=$ENV{'user.name'};      my $uname=$ENV{'user.name'};
Line 1607  getIterator behaves as follows: Line 1995  getIterator behaves as follows:
   
 =over 4  =over 4
   
 =item B<getIterator>(nav_map, firstResource, finishResource, filterHash): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). It is your responsibility to ensure that the iterator will actually get there. filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 1, then only resource that exist IN the filterHash will be recursed on. If it is a 0, only resources NOT in the filterHash will be recursed on. Defaults to 0.  =item B<getIterator>(firstResource, finishResource, filterHash, condition, direction): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0, which is to say, do not recurse unless explicitly asked to. Direction specifies which direction to recurse, either FORWARD or BACKWARD, with FORWARD being default.
   
 Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples.  Thus, by default, all resources will be shown. Change the condition to a 1 without changing the hash, and only the top level of the map will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively examine parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively ignore parts of the nav map. See the handler code for examples: By default, the condition is 0 and all folders are closed unless explicitly opened. Clicking "Show All Resources" will use a condition of 1 and an empty filterHash, resulting in all resources being shown.
   
 The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:  The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:
   
 =over 4  =over 4
   
 =item * some list of tokens here  =item * BEGIN_MAP: A new map is being recursed into. This is returned I<after> the map resource itself is returned.
   
   =item * END_MAP: The map is now done.
   
   =item * BEGIN_BRANCH: A branch is now starting. The next resource returned will be the first in that branch.
   
   =item * END_BRANCH: The branch is now done.
   
 =back  =back
   
 The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_NAV_MAP. (Perl will automatically optimize these into constants.  The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP.
   
   =back
   
 =cut  =cut
   
 # Here are the tokens for the iterator:  # Here are the tokens for the iterator:
   
 sub END_NAV_MAP { return 0; }  # Represents end of entire nav map  
 sub BEGIN_MAP { return 1; }    # begining of a new map  sub BEGIN_MAP { return 1; }    # begining of a new map
 sub END_MAP { return 2; }      # end of the map  sub END_MAP { return 2; }      # end of the map
 sub BEGIN_BRANCH { return 3; } # beginning of a branch  sub BEGIN_BRANCH { return 3; } # beginning of a branch
 sub END_BRANCH { return 4; }   # end of a branch  sub END_BRANCH { return 4; }   # end of a branch
   sub FORWARD { return 1; }      # go forward
   sub BACKWARD { return 2; }
   
 # Params: nav map, start resource, end resource, filter, condition,   # Params: nav map, start resource, end resource, filter, condition, 
 # already seen hash ref  # already seen hash ref
Line 1659  sub new { Line 2056  sub new {
     # A hash, used as a set, of resource already seen      # A hash, used as a set, of resource already seen
     $self->{ALREADY_SEEN} = shift;      $self->{ALREADY_SEEN} = shift;
     if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };      if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} };
       $self->{CONDITION} = shift;
       $self->{DIRECTION} = shift || FORWARD();
   
     # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.      # Flag: Have we started yet? If not, the first action is to return BEGIN_MAP.
     $self->{STARTED} = 0;      $self->{STARTED} = 0;
Line 1683  sub new { Line 2082  sub new {
     $self->{FORCE_NEXT} = undef;      $self->{FORCE_NEXT} = undef;
   
     # Start with the first resource      # Start with the first resource
     push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};      if ($self->{DIRECTION} == FORWARD) {
           push @{$self->{BRANCH_STACK}}, $self->{FIRST_RESOURCE};
       } else {
           push @{$self->{BRANCH_STACK}}, $self->{FINISH_RESOURCE};
       }
     $self->{BRANCH_STACK_SIZE} = 1;      $self->{BRANCH_STACK_SIZE} = 1;
   
     bless($self);      bless($self);
Line 1698  sub next { Line 2101  sub next {
           
     # Iterator logic goes here      # Iterator logic goes here
   
     # Is this return value pre-determined?  
     if (defined($self->{FORCE_NEXT})) {  
         my $tmp = $self->{FORCE_NEXT};  
         $self->{FORCE_NEXT} = undef;  
         return $tmp;  
     }  
   
     # Are we using a recursive iterator? If so, pull from that and      # Are we using a recursive iterator? If so, pull from that and
     # watch the depth; we want to resume our level at the correct time.      # watch the depth; we want to resume our level at the correct time.
     if ($self->{RECURSIVE_ITERATOR_FLAG})      if ($self->{RECURSIVE_ITERATOR_FLAG})
Line 1724  sub next { Line 2120  sub next {
         return $next;          return $next;
     }      }
   
       # Is this return value pre-determined?
       if (defined($self->{FORCE_NEXT})) {
           my $tmp = $self->{FORCE_NEXT};
           $self->{FORCE_NEXT} = undef;
           return $tmp;
       }
   
     # Is there a current resource to grab? If not, then return      # Is there a current resource to grab? If not, then return
     # END_BRANCH and END_MAP in succession.      # END_BRANCH and END_MAP in succession.
     if (scalar(@{$self->{BRANCH_STACK}}) == 0) {      if (scalar(@{$self->{BRANCH_STACK}}) == 0) {
Line 1779  sub next { Line 2182  sub next {
     # remember that we've seen this.      # remember that we've seen this.
     $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;      $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1;
           
     # Are we at the utter end? If so, return the END_NAV_MAP marker.  
     if ($self->{HERE} == $self->{NAV_MAP}->finishResource() ) {  
         $self->{FORCE_NEXT} = $self->END_NAV_MAP;  
         return $self->{HERE};  
     }  
       
     # Get the next possible resources      # Get the next possible resources
     my $nextUnfiltered = $self->{HERE}->getNext();      my $nextUnfiltered;
       if ($self->{DIRECTION} == FORWARD()) {
           $nextUnfiltered = $self->{HERE}->getNext();
       } else {
           $nextUnfiltered = $self->{HERE}->getPrevious();
       }
     my $next = [];      my $next = [];
   
     # filter the next possibilities to remove things we've       # filter the next possibilities to remove things we've 
Line 1812  sub next { Line 2214  sub next {
             $self->{FORCE_NEXT} = $self->END_BRANCH();              $self->{FORCE_NEXT} = $self->END_BRANCH();
             $self->{BRANCH_DEPTH}--;              $self->{BRANCH_DEPTH}--;
         }          }
         return $self->{HERE};  
     }      }
           
     while (@$next) {      while (@$next) {
Line 1829  sub next { Line 2230  sub next {
   
     # If this is a map and we want to recurse down it... (not filtered out)      # If this is a map and we want to recurse down it... (not filtered out)
     if ($self->{HERE}->is_map() &&       if ($self->{HERE}->is_map() && 
          !defined($self->{FILTER}->{$self->{HERE}->map_pc()})) {            (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { 
         $self->{RECURSIVE_ITERATOR_FLAG} = 1;          $self->{RECURSIVE_ITERATOR_FLAG} = 1;
         my $firstResource = $self->{HERE}->map_start();          my $firstResource = $self->{HERE}->map_start();
         my $finishResource = $self->{HERE}->map_finish();          my $finishResource = $self->{HERE}->map_finish();
   
         # Odd perl syntax here; $self->new allows one to create a new iterator  
         # can't figure out how to ref this package directly correctly  
         # isn't MAIN::new, __PACKAGE__::new or Apache::lonnavmaps::iterator->new  
         $self->{RECURSIVE_ITERATOR} =          $self->{RECURSIVE_ITERATOR} =
           Apache::lonnavmaps::iterator->new ($self->{NAV_MAP}, $firstResource,             Apache::lonnavmaps::iterator->new ($self->{NAV_MAP}, $firstResource, 
                      $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN});                       $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN},
         # prime the new iterator with the first resource                                               $self->{CONDITION}, $self->{DIRECTION});
         #push @{$self->{RECURSIVE_ITERATOR}->{BRANCH_STACK}}, $firstResource;  
     }      }
   
     return $self->{HERE};      return $self->{HERE};
Line 1868  sub populateStack { Line 2265  sub populateStack {
     my $self=shift;      my $self=shift;
     my $stack = shift;      my $stack = shift;
   
     push @$stack, $self->{HERE};      push @$stack, $self->{HERE} if ($self->{HERE});
   
     if ($self->{RECURSIVE_ITERATOR_FLAG}) {      if ($self->{RECURSIVE_ITERATOR_FLAG}) {
         $self->{RECURSIVE_ITERATOR}->populateStack($stack);          $self->{RECURSIVE_ITERATOR}->populateStack($stack);
Line 1899  resource objects have a hash called DATA Line 2296  resource objects have a hash called DATA
   
 =over 4  =over 4
   
 =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself.   =item * B<new>($navmapRef, $idString): The first arg is a reference to the parent navmap object. The second is the idString of the resource itself. Very rarely, if ever, called directly. Use the nav map->getByID() method.
   
   =back
   
 =cut  =cut
   
Line 1914  sub new { Line 2313  sub new {
   
     # Store this new resource in the parent nav map's cache.      # Store this new resource in the parent nav map's cache.
     $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;      $self->{NAV_MAP}->{RESOURCE_CACHE}->{$self->{ID}} = $self;
       $self->{RESOURCE_ERROR} = 0;
   
     # A hash that can be used by two-pass algorithms to store data      # A hash that can be used by two-pass algorithms to store data
     # about this resource in. Not used by the resource object      # about this resource in. Not used by the resource object
Line 1925  sub new { Line 2325  sub new {
     return $self;      return $self;
 }  }
   
 =pod  
   
 =item * B<is_map>: Returns true if this is a map, false otherwise.  
   
 =item * B<title>: Returns title.  
   
 =item * B<type>: Returns the type of the resource, "start", "normal", or "finish".   
   
 =item * B<problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field.)  
   
 =back  
   
 =cut  
   
 # private function: simplify the NAV_HASH lookups we keep doing  # private function: simplify the NAV_HASH lookups we keep doing
 # pass the name, and to automatically append my ID, pass a true val on the  # pass the name, and to automatically append my ID, pass a true val on the
 # second param  # second param
Line 1949  sub navHash { Line 2335  sub navHash {
     return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")};      return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")};
 }  }
   
   =pod
   
   B<Metadata Retreival>
   
   These are methods that help you retrieve metadata about the resource:
   
   =over 4
   
   =item * B<ext>: Returns true if the resource is external.
   
   =item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
   
   =item * B<kind>: Returns the kind of the resource from the compiled nav map.
   
   =item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature.
   
   =item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)
   
   =item * B<src>: Returns the source for the resource.
   
   =item * B<symb>: Returns the symb for the resource.
   
   =item * B<title>: Returns the title of the resource.
   
   =item * B<to>: Returns the "to" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)
   
   =back
   
   =cut
   
 # These info functions can be used directly, as they don't return  # These info functions can be used directly, as they don't return
 # resource information.  # resource information.
 sub title { my $self=shift; return $self->navHash("title_", 1); }  sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 1); }
 sub type { my $self=shift; return $self->navHash("type_", 1); }  sub ext { my $self=shift; return $self->navHash("ext_", 1) eq 'true:'; }
   sub from { my $self=shift; return $self->navHash("from_", 1); }
 sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }  sub goesto { my $self=shift; return $self->navHash("goesto_", 1); }
 # "to" can return a comma seperated list for branches  
 sub to { my $self=shift; return $self->navHash("to_", 1); }  
 sub kind { my $self=shift; return $self->navHash("kind_", 1); }  sub kind { my $self=shift; return $self->navHash("kind_", 1); }
   sub randomout { my $self=shift; return $self->navHash("randomout_", 1); }
   sub randompick { 
       my $self = shift;
       return $self->{NAV_MAP}->{PARM_HASH}->{$self->symb .
                                                  '.0.parameter_randompick'};
   }
 sub src {   sub src { 
     my $self=shift;      my $self=shift;
     return $self->navHash("src_", 1);      return $self->navHash("src_", 1);
Line 1969  sub symb { Line 2390  sub symb {
          $self->navHash('map_id_'.$first))            $self->navHash('map_id_'.$first)) 
         . '___' . $second . '___' . $symbSrc;          . '___' . $second . '___' . $symbSrc;
 }  }
 sub is_problem {  sub title { my $self=shift; return $self->navHash("title_", 1); }
   sub to { my $self=shift; return $self->navHash("to_", 1); }
   
   =pod
   
   B<Predicate Testing the Resource>
   
   These methods are shortcuts to deciding if a given resource has a given property.
   
   =over 4
   
   =item * B<is_map>: Returns true if the resource is a map type.
   
   =item * B<is_problem>: Returns true if the resource is a problem type, false otherwise. (Looks at the extension on the src field; might need more to work correctly.)
   
   =item * B<is_page>: Returns true if the resource is a page.
   
   =item * B<is_problem>: Returns true if the resource is a problem.
   
   =item * B<is_sequence>: Returns true if the resource sequence.
   
   =back
   
   =cut
   
   
   sub is_html {
     my $self=shift;      my $self=shift;
     my $src = $self->src();      my $src = $self->src();
     return ($src =~ /problem$/);      return ($src =~ /html$/);
 }  }
 sub is_html {  sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }
   sub is_page {
     my $self=shift;      my $self=shift;
     my $src = $self->src();      my $src = $self->src();
     return ($src =~ /html$/);      return ($src =~ /page$/);
 }  }
 sub is_sequence {  sub is_problem {
     my $self=shift;      my $self=shift;
     my $src = $self->src();      my $src = $self->src();
     return ($src =~ /sequence$/);      return ($src =~ /problem$/);
 }  }
 sub is_page {  sub is_sequence {
     my $self=shift;      my $self=shift;
     my $src = $self->src();      my $src = $self->src();
     return ($src =~ /page$/);      return ($src =~ /sequence$/);
 }  }
   
   
   
   
   
 # Move this into POD: In order to use these correctly, courseopt  # Move this into POD: In order to use these correctly, courseopt
 # and useropt need to be generated  # and useropt need to be generated
 sub parmval {  sub parmval {
Line 2002  sub parmval { Line 2451  sub parmval {
     return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());      return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb());
 }  }
   
 #####  =pod
 # Map Queries  
 #####  
   
 # These methods relate to whether or not the resource is a map, and the   B<Map Methods>
 # attributes of that map.  
   These methods are useful for getting information about the map properties of the resource, if the resource is a map (B<is_map>).
   
   =over 4
   
   =item * B<map_finish>: Returns a reference to a resource object corresponding to the finish resource of the map.
   
   =item * B<map_pc>: Returns the pc value of the map, which is the first number that appears in the resource ID of the resources in the map, and is the number that appears around the middle of the symbs of the resources in that map.
   
   =item * B<map_start>: Returns a reference to a resource object corresponding to the start resource of the map.
   
   =item * B<map_type>: Returns a string with the type of the map in it.
   
   =back
   
   =cut
   
 sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); }  
 sub map_finish {  sub map_finish {
     my $self = shift;      my $self = shift;
     my $src = $self->src();      my $src = $self->src();
Line 2017  sub map_finish { Line 2478  sub map_finish {
     $res = $self->{NAV_MAP}->getById($res);      $res = $self->{NAV_MAP}->getById($res);
     return $res;      return $res;
 }  }
   sub map_pc {
       my $self = shift;
       my $src = $self->src();
       return $self->navHash("map_pc_$src", 0);
   }
 sub map_start {  sub map_start {
     my $self = shift;      my $self = shift;
     my $src = $self->src();      my $src = $self->src();
Line 2024  sub map_start { Line 2490  sub map_start {
     $res = $self->{NAV_MAP}->getById($res);      $res = $self->{NAV_MAP}->getById($res);
     return $res;      return $res;
 }  }
 sub map_pc {  
     my $self = shift;  
     my $src = $self->src();  
     return $self->navHash("map_pc_$src", 0);  
 }  
 sub map_type {  sub map_type {
     my $self = shift;      my $self = shift;
     my $pc = $self->map_pc();      my $pc = $self->map_pc();
Line 2051  sub map_type { Line 2512  sub map_type {
   
 =head2 Resource Parameters  =head2 Resource Parameters
   
 In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to "part 0", but can be directed to another part by passing the part as the second parameter.  In order to use the resource parameters correctly, the nav map must have been instantiated with genCourseAndUserOptions set to true, so the courseopt and useropt is read correctly. Then, you can call these functions to get the relevant parameters for the resource. Each function defaults to part "0", but can be directed to another part by passing the part as the parameter.
   
 These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)  These methods are responsible for getting the parameter correct, not merely reflecting the contents of the GDBM hashes. As we move towards dates relative to other dates, these methods should be updated to reflect that. (Then, anybody using these methods won't have to update their code.)
   
Line 2073  These methods are responsible for gettin Line 2534  These methods are responsible for gettin
   
 =item * B<tol>: Get the tolerance for the problem.  =item * B<tol>: Get the tolerance for the problem.
   
   =item * B<tries>: Get the number of tries the user has already used on the problem.
   
 =item * B<type>: Get the question type for the problem.  =item * B<type>: Get the question type for the problem.
   
 =item * B<weight>: Get the weight for the problem.  =item * B<weight>: Get the weight for the problem.
Line 2118  sub tol { Line 2581  sub tol {
     (my $self, my $part) = @_;      (my $self, my $part) = @_;
     return $self->parmval("tol", $part);      return $self->parmval("tol", $part);
 }  }
 sub type {  
     (my $self, my $part) = @_;  
     return $self->parmval("type", $part);  
 }  
 sub weight {  
     (my $self, my $part) = @_;  
     return $self->parmval("weight", $part);  
 }  
 sub tries {  sub tries {
     my $self = shift;      my $self = shift;
     my $part = shift;      my $part = shift;
Line 2138  sub tries { Line 2593  sub tries {
     if (!defined($tries)) {return '0';}      if (!defined($tries)) {return '0';}
     return $tries;      return $tries;
 }  }
   sub type {
       (my $self, my $part) = @_;
       return $self->parmval("type", $part);
   }
   sub weight {
       (my $self, my $part) = @_;
       return $self->parmval("weight", $part);
   }
   
 # Multiple things need this  # Multiple things need this
 sub getReturnHash {  sub getReturnHash {
     my $self = shift;      my $self = shift;
           
     if (!defined($self->{RETURN_HASH})) {      if (!defined($self->{RETURN_HASH})) {
         my %tmpHash = &Apache::lonnet::restore($self->symb());          my %tmpHash  = &Apache::lonnet::restore($self->symb());
         $self->{RETURN_HASH} = \%tmpHash;          $self->{RETURN_HASH} = \%tmpHash;
     }      }
 }         }       
Line 2190  sub hasDiscussion { Line 2653  sub hasDiscussion {
   
 sub getFeedback {  sub getFeedback {
     my $self = shift;      my $self = shift;
     return $self->{NAV_MAP}->getFeedback($self->symb());      return $self->{NAV_MAP}->getFeedback($self->src());
 }  }
   
 =pod  =pod
   
 =item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater then two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. You may or may not wish to filter out part 0.)  =item * B<parts>(): Returns a list reference containing sorted strings corresponding to each part of the problem. To count the number of parts, use the list in a scalar context, and subtract one if greater then two. (One part problems have a part 0. Multi-parts have a part 0, plus a part for each part. Filtering part 0 if you want it is up to you.)
   
 =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0.  =item * B<countParts>(): Returns the number of parts of the problem a student can answer. Thus, for single part problems, returns 1. For multipart, it returns the number of parts in the problem, not including psuedo-part 0. Thus, B<parts> may return an array with fewer parts in it then countParts might lead you to believe.
   
 =back  =back
   
Line 2206  sub getFeedback { Line 2669  sub getFeedback {
 sub parts {  sub parts {
     my $self = shift;      my $self = shift;
   
       if ($self->ext) { return ['0']; }
   
     $self->extractParts();      $self->extractParts();
     return $self->{PARTS};      return $self->{PARTS};
 }  }
Line 2214  sub countParts { Line 2679  sub countParts {
     my $self = shift;      my $self = shift;
           
     my $parts = $self->parts();      my $parts = $self->parts();
       
     if (scalar(@{$parts}) == 1) { return 1;}      if ($self->{RESOURCE_ERROR}) {
           return 0;
       }
   
       if (scalar(@{$parts}) < 2) { return 1;}
   
     return scalar(@{$parts}) - 1;      return scalar(@{$parts}) - 1;
 }  }
Line 2225  sub extractParts { Line 2694  sub extractParts {
     my $self = shift;      my $self = shift;
           
     return if ($self->{PARTS});      return if ($self->{PARTS});
       return if ($self->ext);
   
     $self->{PARTS} = [];      $self->{PARTS} = [];
   
     # Retrieve part count      # Retrieve part count, if this is a problem
     foreach (split(/\,/,&Apache::lonnet::metadata($self->src(),       if ($self->is_problem()) {
                                                   'allpossiblekeys'))) {          my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys');
         if ($_ =~ /^parameter\_(.*)\_opendate$/) {          if (!$metadata) {
             push @{$self->{PARTS}}, $1;              $self->{RESOURCE_ERROR} = 1;
               $self->{PARTS} = [];
               return;
           }
           
           foreach (split(/\,/,$metadata)) {
               if ($_ =~ /^parameter\_(.*)\_opendate$/) {
                   push @{$self->{PARTS}}, $1;
               }
         }          }
           
           
           # Is this possible to do in one line? - Jeremy
           my @sortedParts = sort @{$self->{PARTS}};
           $self->{PARTS} = \@sortedParts;
     }      }
       
     # Is this possible to do in one line? - Jeremy  
     my @sortedParts = sort @{$self->{PARTS}};  
     $self->{PARTS} = \@sortedParts;  
   
     return;      return;
 }  }
Line 2257  Idiomatic usage of these two methods wou Line 2736  Idiomatic usage of these two methods wou
     my $dateStatus = $resource->getDateStatus($_);      my $dateStatus = $resource->getDateStatus($_);
     my $completionStatus = $resource->getCompletionStatus($_);      my $completionStatus = $resource->getCompletionStatus($_);
   
       or
   
       my $status = $resource->status($_);
   
     ... use it here ...      ... use it here ...
  }   }
   
 =over 4  =over 4
   
 =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. You should still check to see if there is a due date at all, if you care about that. The possible return values are:  =item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:
   
 =back  =back
   
Line 2357  B<Completion Codes> Line 2840  B<Completion Codes>
   
 =item * B<NETWORK_FAILURE>: Information not available due to network failure.  =item * B<NETWORK_FAILURE>: Information not available due to network failure.
   
   =item * B<ATTEMPTED>: Attempted, and not yet graded.
   
 =back  =back
   
 =cut  =cut
Line 2367  sub INCORRECT_BY_OVERRIDE { return 12; } Line 2852  sub INCORRECT_BY_OVERRIDE { return 12; }
 sub CORRECT               { return 13; }  sub CORRECT               { return 13; }
 sub CORRECT_BY_OVERRIDE   { return 14; }  sub CORRECT_BY_OVERRIDE   { return 14; }
 sub EXCUSED               { return 15; }  sub EXCUSED               { return 15; }
   sub ATTEMPTED             { return 16; }
   
 sub getCompletionStatus {  sub getCompletionStatus {
     my $self = shift;      my $self = shift;
Line 2385  sub getCompletionStatus { Line 2871  sub getCompletionStatus {
     if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }      if ($status eq 'incorrect_attempted') {return $self->INCORRECT; }
     if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }      if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; }
     if ($status eq 'excused') {return $self->EXCUSED; }      if ($status eq 'excused') {return $self->EXCUSED; }
       if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; }
     return $self->NOT_ATTEMPTED;      return $self->NOT_ATTEMPTED;
 }  }
   
Line 2396  Along with directly returning the date o Line 2883  Along with directly returning the date o
   
 =over 4  =over 4
   
 =item * NETWORK_FAILURE: The network has failed and the information is not available.  =item * B<NETWORK_FAILURE>: The network has failed and the information is not available.
   
   =item * B<NOTHING_SET>: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)
   
 =item * NOTHING_SET: No dates have been set for this problem (part) at all. (Because only certain parts of a multi-part problem may be assigned, this can not be collapsed into "open later", as we don't know a given part will EVER be opened. For single part, this is the same as "OPEN_LATER".)  =item * B<CORRECT>: For any reason at all, the part is considered correct.
   
 =item * CORRECT: For any reason at all, the part is considered correct.  =item * B<EXCUSED>: For any reason at all, the problem is excused.
   
 =item * EXCUSED: For any reason at all, the problem is excused.  =item * B<PAST_DUE_NO_ANSWER>: The problem is past due, not considered correct, and no answer date is set.
   
 =item * PAST_DUE_NO_ANSWER: The problem is past due, not considered correct, and no answer date is set.  =item * B<PAST_DUE_ANSWER_LATER>: The problem is past due, not considered correct, and an answer date in the future is set.
   
 =item * PAST_DUE_ANSWER_LATER: The problem is past due, not considered correct, and an answer date in the future is set.  =item * B<ANSWER_OPEN>: The problem is past due, not correct, and the answer is now available.
   
 =item * ANSWER_OPEN: The problem is past due, not correct, and the answer is now available.  =item * B<OPEN_LATER>: The problem is not yet open.
   
 =item * OPEN_LATER: The problem is not yet open.  =item * B<TRIES_LEFT>: The problem is open, has been tried, is not correct, but there are tries left.
   
 =item * TRIES_LEFT: The problem is open, has been tried, is not correct, but there are tries left.  =item * B<INCORRECT>: The problem is open, and all tries have been used without getting the correct answer.
   
 =item * INCORRECT: The problem is open, and all tries have been used without getting the correct answer.  =item * B<OPEN>: The item is open and not yet tried.
   
 =item * OPEN: The item is open and not yet tried.  =item * B<ATTEMPTED>: The problem has been attempted.
   
 =back  =back
   
Line 2440  sub status { Line 2929  sub status {
     # There are a few whole rows we can dispose of:      # There are a few whole rows we can dispose of:
     if ($completionStatus == CORRECT ||      if ($completionStatus == CORRECT ||
         $completionStatus == CORRECT_BY_OVERRIDE ) {          $completionStatus == CORRECT_BY_OVERRIDE ) {
         return CORRECT();           return CORRECT; 
       }
   
       if ($completionStatus == ATTEMPTED) {
           return ATTEMPTED;
     }      }
   
     # If it's EXCUSED, then return that no matter what      # If it's EXCUSED, then return that no matter what
Line 2452  sub status { Line 2945  sub status {
         return NOTHING_SET;          return NOTHING_SET;
     }      }
   
     # Now we're down to a 3 (incorrect, incorrect_override, not_attempted)      # Now we're down to a 4 (incorrect, incorrect_override, not_attempted)
     # by 4 matrix (date status).      # by 4 matrix (date statuses).
   
     if ($dateStatus == PAST_DUE_ANSWER_LATER ||      if ($dateStatus == PAST_DUE_ANSWER_LATER ||
         $dateStatus == PAST_DUE_NO_ANSWER ) {          $dateStatus == PAST_DUE_NO_ANSWER ) {
Line 2474  sub status { Line 2967  sub status {
     # If it's WRONG...      # If it's WRONG...
     if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {      if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) {
         # and there are TRIES LEFT:          # and there are TRIES LEFT:
         if ($self->tries() < $self->maxtries()) {          if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) {
             return TRIES_LEFT;              return TRIES_LEFT;
         }          }
         return INCORRECT; # otherwise, return orange; student can't fix this          return INCORRECT; # otherwise, return orange; student can't fix this
Line 2490  sub status { Line 2983  sub status {
   
 =over 4  =over 4
   
 =item * B<getNext>(): Gets the next resource in the navmap after this one.  =item * B<getNext>($alreadySeenHashRef): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case. The "alreadySeenHashRef" is an optional parameter that can be passed in to the method. If $$alreadySeenHashRef{$res->id()} is true in that hash, getNext will not return it in the list. In other words, you can use it to suppress resources you've already seen in the getNext method directly.
   
 =cut  =item * B<getPrevious>($alreadySeenHashRef): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case. $alreadySeenHashRef is the same as in getNext.
   
 # For the simple single-link case, to get from a resource to the next  =cut
 # resource, you need to look up the "to_" link in the nav hash, then  
 # follow that with the "goesto_" link.  
   
 sub getNext {  sub getNext {
     my $self = shift;      my $self = shift;
     my $alreadySeenHash = shift;      my $alreadySeenHash = shift;
     my @branches;      my @branches;
     my $to = $self->to();      my $to = $self->to();
     foreach my $branch ( split(/\,/, $to) ) {      foreach my $branch ( split(/,/, $to) ) {
         my $choice = $self->{NAV_MAP}->getById($branch);          my $choice = $self->{NAV_MAP}->getById($branch);
         my $next = $choice->goesto();          my $next = $choice->goesto();
         $next = $self->{NAV_MAP}->getById($next);          $next = $self->{NAV_MAP}->getById($next);
   
         # Don't remember it if we've already seen it          # Don't remember it if we've already seen it or if
           # the student doesn't have browse priviledges
           my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
         if (!defined($alreadySeenHash) ||          if (!defined($alreadySeenHash) ||
             !defined($alreadySeenHash->{$next->{ID}})) {              !defined($alreadySeenHash->{$next->{ID}}) ||
               ($browsePriv ne '2' && $browsePriv ne 'F')) {
                 push @branches, $next;                  push @branches, $next;
             }              }
     }      }
     return \@branches;      return \@branches;
 }  }
   
   sub getPrevious {
       my $self = shift;
       my $alreadySeenHash = shift;
       my @branches;
       my $from = $self->from();
       foreach my $branch ( split /,/, $from) {
           my $choice = $self->{NAV_MAP}->getById($branch);
           my $prev = $choice->comesfrom();
           $prev = $self->{NAV_MAP}->getById($prev);
   
           # Skip it if we've already seen it or the user doesn't have
           # browse privs
           my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
           if (!defined($alreadySeenHash) ||
               !defined($alreadySeenHash->{$prev->{ID}}) ||
               ($browsePriv ne '2' && $browsePriv ne 'F')) {
               push @branches, $prev;
           }
       }
       return \@branches;
   }
   
 =pod  =pod
   
Removed from v.1.59  
changed lines
  Added in v.1.92

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