--- loncom/interface/lonnavmaps.pm 2001/01/06 20:08:10 1.4 +++ loncom/interface/lonnavmaps.pm 2002/11/08 18:44:02 1.99 @@ -1,6 +1,31 @@ + # The LearningOnline Network with CAPA # Navigate Maps Handler # +# $Id: lonnavmaps.pm,v 1.99 2002/11/08 18:44:02 bowersj2 Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# # (Page Handler # # (TeX Content Handler @@ -9,227 +34,2549 @@ # 08/30,08/31,09/06,09/14,09/15,09/16,09/19,09/20,09/21,09/23, # 10/02,10/10,10/14,10/16,10/18,10/19,10/31,11/6,11/14,11/16 Gerd Kortemeyer) # -# 3/1/1,6/1 Gerd Kortemeyer +# 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer +# YEAR=2002 +# 1/1 Gerd Kortemeyer +# package Apache::lonnavmaps; use strict; use Apache::Constants qw(:common :http); use Apache::lonnet(); -use HTML::TokeParser; +use Apache::loncommon(); use GDBM_File; +use POSIX qw (floor strftime); + +sub handler { + my $r = shift; + + &Apache::loncommon::get_unprocessed_cgi($ENV{QUERY_STRING}); + + # Handle header-only request + if ($r->header_only) { + if ($ENV{'browser.mathml'}) { + $r->content_type('text/xml'); + } else { + $r->content_type('text/html'); + } + $r->send_http_header; + return OK; + } + + # Send header, don't cache this page + if ($ENV{'browser.mathml'}) { + $r->content_type('text/xml'); + } else { + $r->content_type('text/html'); + } + &Apache::loncommon::no_cache($r); + $r->send_http_header; -# -------------------------------------------------------------- Module Globals -my %hash; -my @rows; - -# ------------------------------------------------------------------ Euclid gcd - -sub euclid { - my ($e,$f)=@_; - my $a; my $b; my $r; - if ($e>$f) { $b=$e; $r=$f; } else { $r=$e; $b=$f; } - while ($r!=0) { - $a=$b; $b=$r; - $r=$a%$b; - } - return $b; -} - -# ------------------------------------------------------------ Build page table - -sub tracetable { - my ($sofar,$rid,$beenhere)=@_; - my $further=$sofar; - unless ($beenhere=~/\&$rid\&/) { - $beenhere.=$rid.'&'; - - if (defined($hash{'is_map_'.$rid})) { - if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) && - (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) { - my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}}; - $sofar= - &tracetable($sofar,$hash{'map_start_'.$hash{'src_'.$rid}}, - '&'.$frid.'&'); - $sofar++; - if ($hash{'src_'.$frid}) { - my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$frid}); - if (($brepriv eq '2') || ($brepriv eq 'F')) { - if (defined($rows[$sofar])) { - $rows[$sofar].='&'.$frid; - } else { - $rows[$sofar]=$frid; - } - } - } - } - } else { - $sofar++; - if ($hash{'src_'.$rid}) { - my $brepriv=&Apache::lonnet::allowed('bre',$hash{'src_'.$rid}); - if (($brepriv eq '2') || ($brepriv eq 'F')) { - if (defined($rows[$sofar])) { - $rows[$sofar].='&'.$rid; - } else { - $rows[$sofar]=$rid; - } - } - } - } - - if (defined($hash{'to_'.$rid})) { - my $mincond=1; - my $next=''; - map { - my $thiscond= - &Apache::lonnet::directcondval($hash{'condid_'.$hash{'undercond_'.$_}}); - if ($thiscond>=$mincond) { - if ($next) { - $next.=','.$_.':'.$thiscond; - } else { - $next=$_.':'.$thiscond; - } - if ($thiscond>$mincond) { $mincond=$thiscond; } - } - } split(/\,/,$hash{'to_'.$rid}); - map { - my ($linkid,$condval)=split(/\:/,$_); - if ($condval>=$mincond) { - my $now=&tracetable($sofar,$hash{'goesto_'.$linkid},$beenhere); - if ($now>$further) { $further=$now; } - } - } split(/\,/,$next); + # Create the nav map the nav map + my $navmap = Apache::lonnavmaps::navmap->new( + $ENV{"request.course.fn"}.".db", + $ENV{"request.course.fn"}."_parms.db", 1, 1); - } + + if (!defined($navmap)) { + my $requrl = $r->uri; + $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized"; + return HTTP_NOT_ACCEPTABLE; + } + + # Header + $r->print(&Apache::loncommon::bodytag('Navigate Course Map','', + '')); + $r->print(''); + my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'}; + $r->print(''); + my $date=localtime; + $r->print(''); + if ($navmap->{LAST_CHECK}) { + $r->print(''); + } else { + $r->print(''); + } + $r->print('
Key:    '. + ' New discussion since '. + strftime("%A, %b %e at %I:%M %P", localtime($navmap->{LAST_CHECK})). + '  '. + ' New message (click to open)

'. + '

  '. + ' Discussions'. + '   New message (click to open)'. + '
'); + my $condition = 0; + if ($ENV{'form.condition'}) { + $condition = 1; + } + + if ($condition) { + $r->print('Close All Folders'); + } else { + $r->print('Open All Folders'); + } + + $r->print('
 '); + $r->rflush(); + + # Now that we've displayed some stuff to the user, init the navmap + $navmap->init(); + + # Check that it's defined + if (!($navmap->courseMapDefined())) { + $r->print('Coursemap undefined.' . + ''); + return OK; + } + + # Grab a resource object so we have access to the constants; this + # is technically not proper, but should be harmless + my $res = $navmap->firstResource(); + + # Defines a status->color mapping, null string means don't color + my %colormap = + ( $res->NETWORK_FAILURE => '', + $res->CORRECT => '', + $res->EXCUSED => '#BBBBFF', + $res->PAST_DUE_ANSWER_LATER => '', + $res->PAST_DUE_NO_ANSWER => '', + $res->ANSWER_OPEN => '#CCFFCC', + $res->OPEN_LATER => '', + $res->TRIES_LEFT => '', + $res->INCORRECT => '', + $res->OPEN => '', + $res->NOTHING_SET => '' ); + # 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 + my $hurryUpColor = "#FF0000"; + + my %statusIconMap = + ( $res->NETWORK_FAILURE => '', + $res->NOTHING_SET => '', + $res->CORRECT => 'navmap.correct.gif', + $res->EXCUSED => 'navmap.correct.gif', + $res->PAST_DUE_NO_ANSWER => 'navmap.wrong.gif', + $res->PAST_DUE_ANSWER_LATER => 'navmap.wrong.gif', + $res->ANSWER_OPEN => 'navmap.wrong.gif', + $res->OPEN_LATER => '', + $res->TRIES_LEFT => 'navmap.open.gif', + $res->INCORRECT => 'navmap.wrong.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 = + ( $res->NETWORK_FAILURE => 1, + $res->NOTHING_SET => 1, + $res->CORRECT => 1 ); + + my %filterHash; + # Figure out what we're not displaying + foreach (split(/\,/, $ENV{"form.filter"})) { + if ($_) { + $filterHash{$_} = "1"; + } + } + + # 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"; + + # Begin the HTML table + # four cols: resource + indent, chat+feedback, icon, text string + $r->print('' ."\n"); + + # 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 + + # This currently does very little... + #my $mapEventualIterator = Apache::lonnavmaps::iterator->new($navmap, undef, undef, {}, + #undef, $condition); + + 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 $counter = 0; + + while ($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 + my $indentLevel = 0; + my $indentString = "\"\""; + + my $isNewBranch = 0; + my $now = time(); + 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 = $mapIterator->next(); + next; + } + + if ($curRes == $mapIterator->BEGIN_MAP() || + $curRes == $mapIterator->BEGIN_BRANCH()) { + $indentLevel++; + } + if ($curRes == $mapIterator->END_MAP() || + $curRes == $mapIterator->END_BRANCH()) { + $indentLevel--; + } + if ($curRes == $mapIterator->BEGIN_BRANCH()) { + $isNewBranch = 1; + } + if ($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) && $curRes->src()) { + + # Step one: Decide which parts to show + my @parts = @{$curRes->parts()}; + my $multipart = scalar(@parts) > 1; + my $condensed = 0; + + if ($curRes->is_problem()) { + # Is it multipart? + + if ($multipart) { + # If it's multipart, see if part 0 is "open" + # if it is, display all parts, if it isn't, + # just display first + if (!$curRes->opendate("0")) { + @parts = ("0"); # just display the zero-th part + $condensed = 1; + } else { + # Otherwise, only display part 0 if we want to + # attach feedback or email information to it + if ($curRes->hasDiscussion() || $curRes->getFeedback()) { + shift @parts; + } else { + # If there's discussion or feedback, that counts + # as a difference, so display the parts. + + # Now, we decide whether to condense the + # parts due to similarity + my $status = $curRes->status($parts[1]); + my $due = $curRes->duedate($parts[1]); + my $open = $curRes->opendate($parts[1]); + my $statusAllSame = 1; + my $dueAllSame = 1; + my $openAllSame = 1; + for (my $i = 2; $i < scalar(@parts); $i++) { + if ($curRes->status($parts[$i]) != $status){ + $statusAllSame = 0; + } + if ($curRes->duedate($parts[$i]) != $due ) { + $dueAllSame = 0; + } + if ($curRes->opendate($parts[$i]) != $open) { + $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 { + $parts[0] = "0"; # this is to get past foreach loop below + # you can consider a non-problem resource as a resource + # 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 ) { + $multipart = 0; + } + + # Display one part, in event of network error. + # If this is a single part, we can at least show the correct + # status, but if it's multipart, we're lost. + if ($curRes->{RESOURCE_ERROR}) { + @parts = ("0"); + } + + # Step two: Show the parts + foreach my $part (@parts) { + + my $deltalevel = 0; # for inserting the branch icon + my $nonLinkedText = ""; # unlinked stuff after title + + # For each thing we're displaying... + + my $stack = $mapIterator->getStack(); + my $src = getLinkForResource($stack); + + my $srcHasQuestion = $src =~ /\?/; + my $link = $src. + ($srcHasQuestion?'&':'?') . + 'symb='.&Apache::lonnet::escape($curRes->symb()). + '"'; + my $title = $curRes->title(); + if (!$title) { + $title = $curRes->src(); + $title = substr ($title, rindex($title, "/") + 1); + } + my $partLabel = ""; + my $newBranchText = ""; + + # If this is a new branch, label it so + # (temporary, this should be an icon w/ alt text) + if ($isNewBranch) { + $newBranchText = ""; + $isNewBranch = 0; + $deltalevel = 1; + } + + # links to open and close the folders + my $linkopen = ""; + my $linkclose = ""; + + my $icon = "\"\""; + if ($curRes->is_problem()) { + if ($part eq "0" || $condensed) { + $icon = ''; + } else { + $icon = $indentString; + } + } + + # Display the correct icon, link to open or shut map + if ($curRes->is_map()) { + my $mapId = $curRes->map_pc(); + my $nowOpen = (!defined($filterHash{$mapId})); + if ($condition) {$nowOpen = !$nowOpen;} + $icon = $nowOpen ? + "navmap.folder.closed.gif" : "navmap.folder.open.gif"; + $icon = "\"\""; + $linkopen = ""; + $linkclose = ""; + + } + + my $colorizer = ""; + my $color; + if ($curRes->is_problem()) { + my $status = $curRes->status($part); + $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 "") { + $colorizer = "bgcolor=\"$color\""; + } + } + + if ($curRes->randomout()) { + $nonLinkedText .= ' (hidden) '; + } + + $rowNum++; + my $backgroundColor = $backgroundColors[$rowNum % scalar(@backgroundColors)]; + + # FIRST COL: The resource indentation, branch icon, name, and anchor + $r->print(" "); + + # Is this the first displayed part of a multi-part problem + # that has not been condensed, so we should suppress these two + # columns? + my $firstDisplayed = !$condensed && $multipart && $part eq "0"; + + # THIRD COL: Problem status icon + if ($curRes->is_problem() && + !$firstDisplayed) { + my $icon = $statusIconMap{$curRes->status($part)}; + my $alt = $iconAltTags{$icon}; + if ($icon) { + $r->print("\n"); + } else { + $r->print("\n"); + } + } else { # not problem, no icon + $r->print("\n"); + } + + # FOURTH COL: Text description + #$r->print("\n"); + } + } + $curRes = $mapIterator->next(); } - return $further; + + $r->print("
\n"); + + # anchor for current resource... - 5 is deliberate: If it's that + # high on the screen, don't bother focusing on it. Also this will + # print multiple anchors if this is an expanded multi-part problem... + # who cares? + if ($counter == $currentUrlIndex - 5) { + $r->print(''); + } + + # print indentation + for (my $i = 0; $i < $indentLevel - $deltalevel + $deltadepth; $i++) { + $r->print($indentString); + } + + $r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n"); + + my $curMarkerBegin = ""; + my $curMarkerEnd = ""; + + # Is this the current resource? + if ($curRes->src() eq $currenturl && !$displayedHereMarker) { + $curMarkerBegin = '> '; + $curMarkerEnd = ' <'; + $displayedHereMarker = 1; + } + + if ($curRes->is_problem() && $part ne "0" && !$condensed) { + $partLabel = " (Part $part)"; + $title = ""; + } + if ($multipart && $condensed) { + $nonLinkedText .= ' (' . $curRes->countParts() . ' parts)'; + } + + $r->print(" $curMarkerBegin$title$partLabel $curMarkerEnd $nonLinkedText"); + #$r->print(" TDV:" . $curRes->{DATA}->{TOP_DOWN_VAL}); # temp + #$r->print(" BUV:" . $curRes->{DATA}->{BOT_UP_VAL}); # temp + #$r->print(" DD:" . $curRes->{DATA}->{DISPLAY_DEPTH}); # temp + + if ($curRes->{RESOURCE_ERROR}) { + $r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down", + 'Host down')); + } + + my $discussionHTML = ""; my $feedbackHTML = ""; + + # SECOND COL: Is there text, feedback, errors?? + if ($curRes->hasDiscussion()) { + $discussionHTML = $linkopen . + '' . + $linkclose; + } + + if ($curRes->getFeedback()) { + my $feedback = $curRes->getFeedback(); + foreach (split(/\,/, $feedback)) { + if ($_) { + $feedbackHTML .= ' ' + . ''; + } + } + } + + $r->print("$discussionHTML$feedbackHTML $linkopen\"$alt\"$linkclose  \n"); + $r->print("\n"); + + if ($curRes->kind() eq "res" && + $curRes->is_problem() && + !$firstDisplayed) { + $r->print ("") if ($color); + $r->print (getDescription($curRes, $part)); + $r->print ("") if ($color); + } + if ($curRes->is_map() && advancedUser() && $curRes->randompick()) { + $r->print('(randomly select ' . $curRes->randompick() .')'); + } + + $r->print(" 
"); + + $navmap->untieHashes(); + + return OK; } -# ================================================================ Main Handler +# Convenience functions: Returns a string that adds or subtracts +# the second argument from the first hash, appropriate for the +# query string that determines which folders to recurse on +sub addToFilter { + my $hashIn = shift; + my $addition = shift; + my %hash = %$hashIn; + $hash{$addition} = 1; -sub handler { - my $r=shift; + return join (",", keys(%hash)); +} +sub removeFromFilter { + my $hashIn = shift; + my $subtraction = shift; + my %hash = %$hashIn; -# ------------------------------------------- Set document type for header only + delete $hash{$subtraction}; + return join(",", keys(%hash)); +} + +# Convenience function: Given a stack returned from getStack on the iterator, +# return the correct src() value. +# Later, this should add an anchor when we start putting anchors in pages. +sub getLinkForResource { + my $stack = shift; + my $res; + + # Check to see if there are any pages in the stack + foreach $res (@$stack) { + if (defined($res) && $res->is_page()) { + return $res->src(); + } + } - if ($r->header_only) { - if ($ENV{'browser.mathml'}) { - $r->content_type('text/xml'); - } else { - $r->content_type('text/html'); - } - $r->send_http_header; - return OK; - } - - my $requrl=$r->uri; -# ----------------------------------------------------------------- Tie db file - if ($ENV{'request.course.fn'}) { - my $fn=$ENV{'request.course.fn'}; - if (-e "$fn.db") { - if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) { -# ------------------------------------------------------------------- Hash tied - my $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}}; - my $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}}; - if (($firstres) && ($lastres)) { -# ----------------------------------------------------------------- Render page - - @rows=(); - - &tracetable(0,$firstres,'&'.$lastres.'&'); - if ($hash{'src_'.$lastres}) { - my $brepriv= - &Apache::lonnet::allowed('bre',$hash{'src_'.$lastres}); - if (($brepriv eq '2') || ($brepriv eq 'F')) { - $rows[$#rows+1]=''.$lastres; - } - } - -# ------------------------------------------------------------------ Page parms - - my $j; - my $lcm=1; - my $contents=0; - -# ---------------------------------------------- Go through table to get layout - - for ($i=0;$i<=$#rows;$i++) { - if ($rows[$i]) { - $contents++; - my @colcont=split(/\&/,$rows[$i]); - $lcm*=($#colcont+1)/euclid($lcm,($#colcont+1)); - } - } - } - - unless ($contents) { - $r->content_type('text/html'); - $r->send_http_header; - $r->print('Empty Map.'); - } else { -# ------------------------------------------------------------------ Build page - -# ---------------------------------------------------------------- Send headers - - $r->content_type('text/html'); - $r->send_http_header; - $r->print( - 'Navigate LON-CAPA Maps'); - - $r->print(''. - '

Navigate Course Map

'); - $r->rflush(); -# ----------------------------------------------------------------- Start table - $r->print(''); - for ($i=0;$i<=$#rows;$i++) { - if ($rows[$i]) { - $r->print("\n"); - my @colcont=split(/\&/,$rows[$i]); - my $avespan=$lcm/($#colcont+1); - for ($j=0;$j<=$#colcont;$j++) { - my $rid=$colcont[$j]; - $r->print(''); - } - $r->print(''); - } - } - $r->print("\n
'. - $hash{'title_'.$rid}.''); - $r->print('
"); - - $r->print(''); -# -------------------------------------------------------------------- End page - } -# ------------------------------------------------------------- End render page - } else { - $r->content_type('text/html'); - $r->send_http_header; - $r->print('Coursemap undefined.'); - } -# ------------------------------------------------------------------ Untie hash - unless (untie(%hash)) { - &Apache::lonnet::logthis("WARNING: ". - "Could not untie coursemap $fn (browse)."); - } -# -------------------------------------------------------------------- All done - return OK; -# ----------------------------------------------- Errors, hash could no be tied - } - } - } + # Failing that, return the src of the last resource that is defined + # (when we first recurse on a map, it puts an undefined resource + # on the bottom because $self->{HERE} isn't defined yet, and we + # want the src for the map anyhow) + foreach (@$stack) { + if (defined($_)) { $res = $_; } + } - $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized"; - return HTTP_NOT_ACCEPTABLE; + return $res->src(); +} + +# Convenience function: This seperates the logic of how to create +# the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned", +# etc.) into a seperate function. It takes a resource object as the +# first parameter, and the part number of the resource as the second. +# It's basically a big switch statement on the status of the resource. + +sub getDescription { + my $res = shift; + my $part = shift; + my $status = $res->status($part); + + if ($status == $res->NETWORK_FAILURE) { return ""; } + if ($status == $res->NOTHING_SET) { + return "Not currently assigned."; + } + if ($status == $res->OPEN_LATER) { + return "Open " . timeToHumanString($res->opendate($part)); + } + if ($status == $res->OPEN) { + if ($res->duedate($part)) { + return "Due " . timeToHumanString($res->duedate($part)); + } else { + return "Open, no due date"; + } + } + if ($status == $res->PAST_DUE_ANSWER_LATER) { + return "Answer open " . timeToHumanString($res->answerdate($part)); + } + if ($status == $res->PAST_DUE_NO_ANSWER) { + return "Was due " . timeToHumanString($res->duedate($part)); + } + if ($status == $res->ANSWER_OPEN) { + return "Answer available"; + } + if ($status == $res->EXCUSED) { + return "Excused by instructor"; + } + if ($status == $res->ATTEMPTED) { + return "Not yet graded."; + } + if ($status == $res->TRIES_LEFT) { + my $tries = $res->tries($part); + my $maxtries = $res->maxtries($part); + my $triesString = ""; + if ($tries && $maxtries) { + $triesString = "($tries of $maxtries tries used)"; + if ($maxtries > 1 && $maxtries - $tries == 1) { + $triesString = "$triesString"; + } + } + if ($res->duedate()) { + return "Due " . timeToHumanString($res->duedate($part)) . + " $triesString"; + } else { + return "No due date $triesString"; + } + } +} + +sub advancedUser { + return $ENV{'user.adv'}; +} + + +# 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 $timestring" +# Very, very, very, VERY English-only... goodness help a localizer on +# this func... +sub timeToHumanString { + my ($time) = @_; + # zero, '0' and blank are bad times + if (!$time) { + 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; + } } 1; -__END__ +package Apache::lonnavmaps::navmap; + +=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. + +=head1 navmap object: Encapsulating the compiled nav map + +navmap is an object that encapsulates a compiled course map and provides a reasonable interface to it. + +Most notably it provides a way to navigate the map sensibly and a flexible iterator that makes it easy to write various renderers based on nav maps. + +You must obtain resource objects through the navmap object. + +=head2 Methods + +=over 4 + +=item * B(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 if not. You must check for undef; errors will occur when you try to use the other methods otherwise. + +=item * B(first, finish, filter, condition): See iterator documentation below. + +=cut + +use strict; +use GDBM_File; + +sub new { + # magic invocation to create a class instance + my $proto = shift; + my $class = ref($proto) || $proto; + my $self = {}; + + $self->{NAV_HASH_FILE} = shift; + $self->{PARM_HASH_FILE} = shift; + $self->{GENERATE_COURSE_USER_OPT} = shift; + $self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift; + + # Resource cache stores navmapresource's as we reference them. We generate + # them on-demand so we don't pay for creating resources unless we use them. + $self->{RESOURCE_CACHE} = {}; + + # Network failure flag, if we accessed the course or user opt and + # failed + $self->{NETWORK_FAILURE} = 0; + + # tie the nav hash + my %navmaphash; + if (!(tie(%navmaphash, 'GDBM_File', $self->{NAV_HASH_FILE}, + &GDBM_READER(), 0640))) { + return undef; + } + $self->{NAV_HASH} = \%navmaphash; + + my %parmhash; + if (!(tie(%parmhash, 'GDBM_File', $self->{PARM_HASH_FILE}, + &GDBM_READER(), 0640))) + { + untie $self->{PARM_HASH}; + return undef; + } + $self->{PARM_HASH} = \%parmhash; + $self->{HASH_TIED} = 1; + + bless($self); + + return $self; +} + +sub init { + my $self = shift; + + # If the course opt hash and the user opt hash should be generated, + # generate them + if ($self->{GENERATE_COURSE_USER_OPT}) { + my $uname=$ENV{'user.name'}; + my $udom=$ENV{'user.domain'}; + my $uhome=$ENV{'user.home'}; + my $cid=$ENV{'request.course.id'}; + my $chome=$ENV{'course.'.$cid.'.home'}; + my ($cdom,$cnum)=split(/\_/,$cid); + + my $userprefix=$uname.'_'.$udom.'_'; + + my %courserdatas; my %useropt; my %courseopt; my %userrdatas; + unless ($uhome eq 'no_host') { +# ------------------------------------------------- Get coursedata (if present) + unless ((time-$courserdatas{$cid.'.last_cache'})<240) { + my $reply=&Apache::lonnet::reply('dump:'.$cdom.':'.$cnum. + ':resourcedata',$chome); + if ($reply!~/^error\:/) { + $courserdatas{$cid}=$reply; + $courserdatas{$cid.'.last_cache'}=time; + } + # check to see if network failed + elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i ) + { + $self->{NETWORK_FAILURE} = 1; + } + } + foreach (split(/\&/,$courserdatas{$cid})) { + my ($name,$value)=split(/\=/,$_); + $courseopt{$userprefix.&Apache::lonnet::unescape($name)}= + &Apache::lonnet::unescape($value); + } +# --------------------------------------------------- Get userdata (if present) + unless ((time-$userrdatas{$uname.'___'.$udom.'.last_cache'})<240) { + my $reply=&Apache::lonnet::reply('dump:'.$udom.':'.$uname.':resourcedata',$uhome); + if ($reply!~/^error\:/) { + $userrdatas{$uname.'___'.$udom}=$reply; + $userrdatas{$uname.'___'.$udom.'.last_cache'}=time; + } + # check to see if network failed + elsif ( $reply=~/no.such.host/i || $reply=~/con.*lost/i ) + { + $self->{NETWORK_FAILURE} = 1; + } + } + foreach (split(/\&/,$userrdatas{$uname.'___'.$udom})) { + my ($name,$value)=split(/\=/,$_); + $useropt{$userprefix.&Apache::lonnet::unescape($name)}= + &Apache::lonnet::unescape($value); + } + $self->{COURSE_OPT} = \%courseopt; + $self->{USER_OPT} = \%useropt; + } + } + + if ($self->{GENERATE_EMAIL_DISCUSS_STATUS}) { + my $cid=$ENV{'request.course.id'}; + my ($cdom,$cnum)=split(/\_/,$cid); + + my %emailstatus = &Apache::lonnet::dump('email_status'); + my $logoutTime = $emailstatus{'logout'}; + my $courseLeaveTime = $emailstatus{'logout_'.$ENV{'request.course.id'}}; + $self->{LAST_CHECK} = ($courseLeaveTime > $logoutTime ? + $courseLeaveTime : $logoutTime); + my %discussiontime = &Apache::lonnet::dump('discussiontimes', + $cdom, $cnum); + my %feedback=(); + my %error=(); + my $keys = &Apache::lonnet::reply('keys:'. + $ENV{'user.domain'}.':'. + $ENV{'user.name'}.':nohist_email', + $ENV{'user.home'}); + + foreach my $msgid (split(/\&/, $keys)) { + $msgid=&Apache::lonnet::unescape($msgid); + my $plain=&Apache::lonnet::unescape(&Apache::lonnet::unescape($msgid)); + if ($plain=~/(Error|Feedback) \[([^\]]+)\]/) { + my ($what,$url)=($1,$2); + my %status= + &Apache::lonnet::get('email_status',[$msgid]); + if ($status{$msgid}=~/^error\:/) { + $status{$msgid}=''; + } + + if (($status{$msgid} eq 'new') || + (!$status{$msgid})) { + if ($what eq 'Error') { + $error{$url}.=','.$msgid; + } else { + $feedback{$url}.=','.$msgid; + } + } + } + } + + $self->{FEEDBACK} = \%feedback; + $self->{ERROR_MSG} = \%error; # what is this? JB + $self->{DISCUSSION_TIME} = \%discussiontime; + $self->{EMAIL_STATUS} = \%emailstatus; + + } + + $self->{PARM_CACHE} = {}; +} + +# Checks to see if coursemap is defined, matching test in old lonnavmaps +sub courseMapDefined { + my $self = shift; + my $uri = &Apache::lonnet::clutter($ENV{'request.course.uri'}); + + my $firstres = $self->{NAV_HASH}->{"map_start_$uri"}; + my $lastres = $self->{NAV_HASH}->{"map_finish_$uri"}; + return $firstres && $lastres; +} + +sub getIterator { + my $self = shift; + my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift, + shift, undef, shift, + $ENV{'form.direction'}); + return $iterator; +} + +# unties the hash when done +sub untieHashes { + my $self = shift; + untie %{$self->{NAV_HASH}} if ($self->{HASH_TIED}); + untie %{$self->{PARM_HASH}} if ($self->{HASH_TIED}); + $self->{HASH_TIED} = 0; +} + +# when the object is destroyed, be sure to untie all the hashes we tied. +sub DESTROY { + my $self = shift; + $self->untieHashes(); +} + +# Private function: Does the given resource (as a symb string) have +# current discussion? Returns 0 if chat/mail data not extracted. +sub hasDiscussion { + my $self = shift; + my $symb = shift; + if (!defined($self->{DISCUSSION_TIME})) { return 0; } + + return $self->{DISCUSSION_TIME}->{$symb} > + $self->{LAST_CHECK}; +} + +# Private function: Does the given resource (as a symb string) have +# current feedback? Returns the string in the feedback hash, which +# will be false if it does not exist. +sub getFeedback { + my $self = shift; + my $symb = shift; + + if (!defined($self->{FEEDBACK})) { return ""; } + + return $self->{FEEDBACK}->{$symb}; +} + +=pod + +=item * B(id): Based on the ID of the resource (1.1, 3.2, etc.), get a resource object for that resource. This method, or other methods that use it (as in the resource object) is the only proper way to obtain a resource object. + +=cut + +# The strategy here is to cache the resource objects, and only construct them +# as we use them. The real point is to prevent reading any more from the tied +# hash then we have to, which should hopefully alleviate speed problems. +# Caching is just an incidental detail I throw in because it makes sense. + +sub getById { + my $self = shift; + my $id = shift; + + if (defined ($self->{RESOURCE_CACHE}->{$id})) + { + return $self->{RESOURCE_CACHE}->{$id}; + } + + # resource handles inserting itself into cache. + return Apache::lonnavmaps::resource->new($self, $id); +} + +=pod + +=item * B(): Returns a resource object reference corresponding to the first resource in the navmap. + +=cut + +sub firstResource { + my $self = shift; + my $firstResource = $self->{NAV_HASH}->{'map_start_' . + &Apache::lonnet::clutter($ENV{'request.course.uri'})}; + return $self->getById($firstResource); +} + +=pod + +=item * B(): Returns a resource object reference corresponding to the last resource in the navmap. + +=cut + +sub finishResource { + my $self = shift; + my $firstResource = $self->{NAV_HASH}->{'map_finish_' . + &Apache::lonnet::clutter($ENV{'request.course.uri'})}; + return $self->getById($firstResource); +} + +# -------------------------------------------- Figure out a cascading parameter +# +# For this function to work +# +# * parmhash needs to be tied +# * courseopt and useropt need to be initialized for this user and course +# + +sub parmval { + my $self = shift; + my ($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 $csec=$ENV{'request.course.sec'}; + my $uname=$ENV{'user.name'}; + my $udom=$ENV{'user.domain'}; + + unless ($symb) { return ''; } + my $result=''; + + my ($mapname,$id,$fn)=split(/\_\_\_/,$symb); + +# ----------------------------------------------------- Cascading lookup scheme + my $rwhat=$what; + $what=~s/^parameter\_//; + $what=~s/\_/\./; + + my $symbparm=$symb.'.'.$what; + my $mapparm=$mapname.'___(all).'.$what; + my $usercourseprefix=$uname.'_'.$udom.'_'.$cid; + + my $seclevel= $usercourseprefix.'.['.$csec.'].'.$what; + my $seclevelr=$usercourseprefix.'.['.$csec.'].'.$symbparm; + my $seclevelm=$usercourseprefix.'.['.$csec.'].'.$mapparm; + + my $courselevel= $usercourseprefix.'.'.$what; + my $courselevelr=$usercourseprefix.'.'.$symbparm; + my $courselevelm=$usercourseprefix.'.'.$mapparm; + + my $useropt = $self->{USER_OPT}; + my $courseopt = $self->{COURSE_OPT}; + my $parmhash = $self->{PARM_HASH}; + +# ---------------------------------------------------------- first, check user + if ($uname and defined($useropt)) { + if (defined($$useropt{$courselevelr})) { return $$useropt{$courselevelr}; } + if (defined($$useropt{$courselevelm})) { return $$useropt{$courselevelm}; } + if (defined($$useropt{$courselevel})) { return $$useropt{$courselevel}; } + } + +# ------------------------------------------------------- second, check course + if ($csec and defined($courseopt)) { + if (defined($$courseopt{$seclevelr})) { return $$courseopt{$seclevelr}; } + if (defined($$courseopt{$seclevelm})) { return $$courseopt{$seclevelm}; } + if (defined($$courseopt{$seclevel})) { return $$courseopt{$seclevel}; } + } + + if (defined($courseopt)) { + if (defined($$courseopt{$courselevelr})) { return $$courseopt{$courselevelr}; } + if (defined($$courseopt{$courselevelm})) { return $$courseopt{$courselevelm}; } + if (defined($$courseopt{$courselevel})) { return $$courseopt{$courselevel}; } + } + +# ----------------------------------------------------- third, check map parms + + my $thisparm=$$parmhash{$symbparm}; + if (defined($thisparm)) { return $thisparm; } + +# ----------------------------------------------------- fourth , check default + + my $default=&Apache::lonnet::metadata($fn,$rwhat.'.default'); + if (defined($default)) { return $default} + +# --------------------------------------------------- fifth , cascade up parts + + my ($space,@qualifier)=split(/\./,$rwhat); + my $qualifier=join('.',@qualifier); + unless ($space eq '0') { + my ($part,$id)=split(/\_/,$space); + if ($id) { + my $partgeneral=$self->parmval($part.".$qualifier",$symb); + if (defined($partgeneral)) { return $partgeneral; } + } else { + my $resourcegeneral=$self->parmval("0.$qualifier",$symb); + if (defined($resourcegeneral)) { return $resourcegeneral; } + } + } + return ''; +} + + +1; + +package Apache::lonnavmaps::iterator; + +# This package must precede "navmap" because "navmap" uses it. In +# order to keep the documentation order straight, the iterator is documented +# after the navmap object. + +=pod + +=back + +=head1 navmap Iterator + +An I encapsulates the logic required to traverse a data structure. navmap uses an iterator to traverse the course map according to the criteria you wish to use. + +To obtain an iterator, call the B() function of a B object. (Do not instantiate Apache::lonnavmaps::iterator directly.) This will return a reference to the iterator: + +CgetIterator();> + +To get the next thing from the iterator, call B: + +Cnext()> + +getIterator behaves as follows: + +=over 4 + +=item B(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: 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: + +=over 4 + +=item * BEGIN_MAP: A new map is being recursed into. This is returned I 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 + +The tokens are retreivable via methods on the iterator object, i.e., $iterator->END_MAP. + +=back + +=cut + +# Here are the tokens for the iterator: + +sub BEGIN_MAP { return 1; } # begining of a new map +sub END_MAP { return 2; } # end of the map +sub BEGIN_BRANCH { return 3; } # beginning of a branch +sub END_BRANCH { return 4; } # end of a branch +sub FORWARD { return 1; } # go forward +sub BACKWARD { return 2; } + +sub min { + (my $a, my $b) = @_; + if ($a < $b) { return $a; } else { return $b; } +} + +sub new { + # magic invocation to create a class instance + my $proto = shift; + my $class = ref($proto) || $proto; + my $self = {}; + + $self->{NAV_MAP} = shift; + return undef unless ($self->{NAV_MAP}); + + # Handle the parameters + $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource(); + $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource(); + + # If the given resources are just the ID of the resource, get the + # objects + if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = + $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); } + if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = + $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); } + + $self->{FILTER} = shift; + + # A hash, used as a set, of resource already seen + $self->{ALREADY_SEEN} = shift; + if (!defined($self->{ALREADY_SEEN})) { $self->{ALREADY_SEEN} = {} }; + $self->{CONDITION} = shift; + + # Now, we need to pre-process the map, by walking forward and backward + # over the parts of the map we're going to look at. + + # The processing steps are exactly the same, except for a few small + # changes, so I bundle those up in the following list of two elements: + # (direction_to_iterate, VAL_name, next_resource_method_to_call, + # first_resource). + # This prevents writing nearly-identical code twice. + my @iterations = ( [FORWARD(), 'TOP_DOWN_VAL', 'getNext', + 'FIRST_RESOURCE'], + [BACKWARD(), 'BOT_UP_VAL', 'getPrevious', + 'FINISH_RESOURCE'] ); + + my $maxDepth = 0; # tracks max depth + + foreach my $pass (@iterations) { + my $direction = $pass->[0]; + my $valName = $pass->[1]; + my $nextResourceMethod = $pass->[2]; + my $firstResourceName = $pass->[3]; + + my $iterator = Apache::lonnavmaps::DFSiterator->new($self->{NAV_MAP}, + $self->{FIRST_RESOURCE}, + $self->{FINISH_RESOURCE}, + {}, undef, 0, $direction); + + # prime the recursion + $self->{$firstResourceName}->{DATA}->{$valName} = 0; + my $depth = 0; + $iterator->next(); + my $curRes = $iterator->next(); + while ($depth > -1) { + if ($curRes == $iterator->BEGIN_MAP()) { $depth++; } + if ($curRes == $iterator->END_MAP()) { $depth--; } + + if (ref($curRes)) { + my $resultingVal = $curRes->{DATA}->{$valName}; + my $nextResources = $curRes->$nextResourceMethod(); + my $resourceCount = scalar(@{$nextResources}); + + if ($resourceCount == 1) { + my $current = $nextResources->[0]->{DATA}->{$valName} || 999999999; + $nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current); + } + + if ($resourceCount > 1) { + foreach my $res (@{$nextResources}) { + my $current = $res->{DATA}->{$valName} || 999999999; + $res->{DATA}->{$valName} = min($current, $resultingVal + 1); + } + } + } + if (ref($curRes) && $curRes->is_map() && $direction == FORWARD()) { + my $firstResource = $curRes->map_start(); + my $finishResource = $curRes->map_finish(); + my $newIterator = Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, + $firstResource, + $finishResource, + $self->{FILTER}, + $self->{ALREADY_SEEN}, + $self->{CONDITION}); + } + + # Assign the final val + if (ref($curRes) && $direction == BACKWARD()) { + my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL}, + $curRes->{DATA}->{BOT_UP_VAL}); + + $curRes->{DATA}->{DISPLAY_DEPTH} = $finalDepth; + if ($finalDepth > $maxDepth) {$maxDepth = $finalDepth;} + } + $curRes = $iterator->next(); + } + } + + # Set up some bookkeeping information. + $self->{CURRENT_DEPTH} = 0; + $self->{MAX_DEPTH} = $maxDepth; + $self->{STACK} = []; + $self->{RECURSIVE_ITERATOR_FLAG} = 0; + + for (my $i = 0; $i <= $self->{MAX_DEPTH}; $i++) { + push @{$self->{STACK}}, []; + } + + # Prime the recursion w/ the first resource + push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE}; + $self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1; + + bless ($self); + + return $self; +} + +sub next { + my $self = shift; + + if ($self->{RECURSIVE_ITERATOR_FLAG}) { + # grab the next from the recursive iterator + my $next = $self->{RECURSIVE_ITERATOR}->next(); + + # is it a begin or end map? If so, update the depth + if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; } + if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; } + + # Are we back at depth 0? If so, stop recursing + if ($self->{RECURSIVE_DEPTH} == 0) { + $self->{RECURSIVE_ITERATOR_FLAG} = 0; + } + + return $next; + } + + if (defined($self->{FORCE_NEXT})) { + my $tmp = $self->{FORCE_NEXT}; + $self->{FORCE_NEXT} = undef; + return $tmp; + } + + # Have we not yet begun? If not, return BEGIN_MAP and + # remember we've started. + if ( !$self->{STARTED} ) { + $self->{STARTED} = 1; + return $self->BEGIN_MAP(); + } + + # Here's the guts of the iterator. + + # Find the next resource, if any. + my $found = 0; + my $i = $self->{MAX_DEPTH}; + my $newDepth; + my $here; + while ( $i >= 0 && !$found ) { + if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { + $here = $self->{HERE} = shift @{$self->{STACK}->[$i]}; + $found = 1; + $newDepth = $i; + } + $i--; + } + + # If we still didn't find anything, we're done. + if ( !$found ) { + # We need to get back down to the correct branch depth + if ( $self->{CURRENT_DEPTH} > 0 ) { + $self->{CURRENT_DEPTH}--; + return END_BRANCH(); + } else { + return END_MAP(); + } + } + + # Get to the right level + if ( $self->{CURRENT_DEPTH} > $newDepth ) { + push @{$self->{STACK}->[$newDepth]}, $here; + $self->{CURRENT_DEPTH}--; + return END_BRANCH(); + } + if ( $self->{CURRENT_DEPTH} < $newDepth) { + push @{$self->{STACK}->[$newDepth]}, $here; + $self->{CURRENT_DEPTH}++; + return BEGIN_BRANCH(); + } + + # If we made it here, we have the next resource, and we're at the + # right branch level. So let's examine the resource for where + # we can get to from here. + + # So we need to look at all the resources we can get to from here, + # categorize them if we haven't seen them, remember if we have a new + my $nextUnfiltered = $here->getNext(); + + for (@$nextUnfiltered) { + if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) { + push @{$self->{STACK}->[$_->{DATA}->{DISPLAY_DEPTH}]}, $_; + $self->{ALREADY_SEEN}->{$_->{ID}} = 1; + } + } + + # That ends the main iterator logic. Now, do we want to recurse + # down this map (if this resource is a map)? + if ($self->{HERE}->is_map() && + (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { + $self->{RECURSIVE_ITERATOR_FLAG} = 1; + my $firstResource = $self->{HERE}->map_start(); + my $finishResource = $self->{HERE}->map_finish(); + + $self->{RECURSIVE_ITERATOR} = + Apache::lonnavmaps::iterator->new($self->{NAV_MAP}, $firstResource, + $finishResource, $self->{FILTER}, + $self->{ALREADY_SEEN}, $self->{CONDITION}); + } + + return $self->{HERE}; + +} + +=pod + +The other method available on the iterator is B, which returns an array populated with the current 'stack' of maps, as references to the resource objects. Example: This is useful when making the navigation map, as we need to check whether we are under a page map to see if we need to link directly to the resource, or to the page. The first elements in the array will correspond to the top of the stack (most inclusive map). + +=cut + +sub getStack { + my $self=shift; + + my @stack; + + $self->populateStack(\@stack); + + return \@stack; +} + +# Private method: Calls the iterators recursively to populate the stack. +sub populateStack { + my $self=shift; + my $stack = shift; + + push @$stack, $self->{HERE} if ($self->{HERE}); + + if ($self->{RECURSIVE_ITERATOR_FLAG}) { + $self->{RECURSIVE_ITERATOR}->populateStack($stack); + } +} + +1; + +package Apache::lonnavmaps::DFSiterator; + +# UNDOCUMENTED: This is a private library, it should not generally be used +# by the outside world. What it does is walk through the nav map in a +# depth-first fashion. This is not appropriate for most uses, but it is +# used by the main iterator for pre-processing. It also is able to isolate +# much of the complexity of the main iterator, so the main iterator is much +# simpler. +# There is no real benefit in merging the main iterator and this one into one class... +# all the logic in DFSiterator would need to be replicated, you gain no performance, +# at best, you just make one massively complicated iterator in place of two +# somewhat complicated ones. ;-) - Jeremy + +# Here are the tokens for the iterator, replicated from iterator for convenience: + +sub BEGIN_MAP { return 1; } # begining of a new map +sub END_MAP { return 2; } # end of the map +sub BEGIN_BRANCH { return 3; } # beginning 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, +# already seen hash ref + +sub new { + # magic invocation to create a class instance + my $proto = shift; + my $class = ref($proto) || $proto; + my $self = {}; + + $self->{NAV_MAP} = shift; + return undef unless ($self->{NAV_MAP}); + + # Handle the parameters + $self->{FIRST_RESOURCE} = shift || $self->{NAV_MAP}->firstResource(); + $self->{FINISH_RESOURCE} = shift || $self->{NAV_MAP}->finishResource(); + + # If the given resources are just the ID of the resource, get the + # objects + if (!ref($self->{FIRST_RESOURCE})) { $self->{FIRST_RESOURCE} = + $self->{NAV_MAP}->getById($self->{FIRST_RESOURCE}); } + if (!ref($self->{FINISH_RESOURCE})) { $self->{FINISH_RESOURCE} = + $self->{NAV_MAP}->getById($self->{FINISH_RESOURCE}); } + + $self->{FILTER} = shift; + + # A hash, used as a set, of resource already seen + $self->{ALREADY_SEEN} = shift; + 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. + $self->{STARTED} = 0; + + # Should we continue calling the recursive iterator, if any? + $self->{RECURSIVE_ITERATOR_FLAG} = 0; + # The recursive iterator, if any + $self->{RECURSIVE_ITERATOR} = undef; + # Are we recursing on a map, or a branch? + $self->{RECURSIVE_MAP} = 1; # we'll manually unset this when recursing on branches + # And the count of how deep it is, so that this iterator can keep track of + # when to pick back up again. + $self->{RECURSIVE_DEPTH} = 0; + + # For keeping track of our branches, we maintain our own stack + $self->{BRANCH_STACK} = []; + # If the size shrinks, we exhausted a branch + $self->{BRANCH_STACK_SIZE} = 0; + $self->{BRANCH_DEPTH} = 0; + + # For returning two things in a forced sequence + $self->{FORCE_NEXT} = undef; + + # Start with the 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; + + bless($self); + return $self; +} + +# Note... this function is *touchy*. I strongly recommend tracing +# through it with the debugger a few times on a non-trivial map before +# modifying it. Order is *everything*. +sub next { + my $self = shift; + + # Iterator logic goes here + + # 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. + if ($self->{RECURSIVE_ITERATOR_FLAG}) { + # grab the next from the recursive iterator + my $next = $self->{RECURSIVE_ITERATOR}->next(); + + # is it a begin or end map? Update depth if so + if ($next == BEGIN_MAP() ) { $self->{RECURSIVE_DEPTH}++; } + if ($next == END_MAP() ) { $self->{RECURSIVE_DEPTH}--; } + + # Are we back at depth 0? If so, stop recursing. + if ($self->{RECURSIVE_DEPTH} == 0) { + $self->{RECURSIVE_ITERATOR_FLAG} = 0; + } + + 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 + # END_BRANCH and END_MAP in succession. + if (scalar(@{$self->{BRANCH_STACK}}) == 0) { + if ($self->{BRANCH_DEPTH} > 0) { + $self->{FORCE_NEXT} = $self->END_MAP(); + $self->{BRANCH_DEPTH}--; + return $self->END_BRANCH(); + } else { + return $self->END_MAP(); + } + } + + # Have we not yet begun? If not, return BEGIN_MAP and + # remember that we've started. + if ( !$self->{STARTED} ) { + $self->{STARTED} = 1; + return $self->BEGIN_MAP; + } + + # Did the branch stack shrink since last run? If so, + # we exhausted a branch last time, therefore, we're about + # to start a new one. (We know because we already checked to see + # if the stack was empty.) + if ( scalar (@{$self->{BRANCH_STACK}}) < $self->{BRANCH_STACK_SIZE}) { + $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}}); + $self->{BRANCH_DEPTH}++; + return $self->BEGIN_BRANCH(); + } + + # Remember the size for comparision next time. + $self->{BRANCH_STACK_SIZE} = scalar(@{$self->{BRANCH_STACK}}); + + # If the next resource we mean to return is going to need + # a lower branch level, terminate branches until we get + # there. + + # Get the next resource in the branch + $self->{HERE} = pop @{$self->{BRANCH_STACK}}; + + # Are we at the right depth? If not, close a branch and return + # the current resource onto the branch stack + # Note: There seems to be some bugs here, so don't rely + # on this, use the real iterator instead. + if (defined($self->{HERE}->{DATA}->{ITERATOR_DEPTH}) + && $self->{HERE}->{DATA}->{ITERATOR_DEPTH} < + $self->{BRANCH_DEPTH} ) { + $self->{BRANCH_DEPTH}--; + # return it so we can pick it up eventually + push @{$self->{BRANCH_STACK}}, $self->{HERE}; + return $self->END_BRANCH(); + } + + # We always return it after this point and never before + # (proof: look at just the return statements), so we + # remember that we've seen this. + $self->{ALREADY_SEEN}->{$self->{HERE}->{ID}} = 1; + + # Get the next possible resources + my $nextUnfiltered; + if ($self->{DIRECTION} == FORWARD()) { + $nextUnfiltered = $self->{HERE}->getNext(); + } else { + $nextUnfiltered = $self->{HERE}->getPrevious(); + } + my $next = []; + + # filter the next possibilities to remove things we've + # already seen. Also, remember what branch depth they should + # be displayed at, since there's no other reliable way to tell. + foreach (@$nextUnfiltered) { + if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) { + push @$next, $_; + $_->{DATA}->{ITERATOR_DEPTH} = + $self->{BRANCH_DEPTH} + 1; + } + } + + # Handle branch cases: + # Nothing is available next: BRANCH_END + # 1 thing next: standard non-branch + # 2+ things next: have some branches + my $nextCount = scalar(@$next); + if ($nextCount == 0) { + # Return this and on the next run, close the branch up if we're + # in a branch + if ($self->{BRANCH_DEPTH} > 0 ) { + $self->{FORCE_NEXT} = $self->END_BRANCH(); + $self->{BRANCH_DEPTH}--; + } + } + + while (@$next) { + # copy the next possibilities over to the branch stack + # in the right order + push @{$self->{BRANCH_STACK}}, shift @$next; + } + + if ($nextCount >= 2) { + $self->{FORCE_NEXT} = $self->BEGIN_BRANCH(); + $self->{BRANCH_DEPTH}++; + return $self->{HERE}; + } + + # If this is a map and we want to recurse down it... (not filtered out) + if ($self->{HERE}->is_map() && + (defined($self->{FILTER}->{$self->{HERE}->map_pc()}) xor $self->{CONDITION})) { + $self->{RECURSIVE_ITERATOR_FLAG} = 1; + my $firstResource = $self->{HERE}->map_start(); + my $finishResource = $self->{HERE}->map_finish(); + + $self->{RECURSIVE_ITERATOR} = + Apache::lonnavmaps::DFSiterator->new ($self->{NAV_MAP}, $firstResource, + $finishResource, $self->{FILTER}, $self->{ALREADY_SEEN}, + $self->{CONDITION}, $self->{DIRECTION}); + } + + return $self->{HERE}; +} + +sub getStack { + my $self=shift; + + my @stack; + + $self->populateStack(\@stack); + + return \@stack; +} + +# Private method: Calls the iterators recursively to populate the stack. +sub populateStack { + my $self=shift; + my $stack = shift; + + push @$stack, $self->{HERE} if ($self->{HERE}); + + if ($self->{RECURSIVE_ITERATOR_FLAG}) { + $self->{RECURSIVE_ITERATOR}->populateStack($stack); + } +} + +1; + +package Apache::lonnavmaps::resource; + +use Apache::lonnet; + +=pod + +=head1 Object: resource + +A resource object encapsulates a resource in a resource map, allowing easy manipulation of the resource, querying the properties of the resource (including user properties), and represents a reference that can be used as the canonical representation of the resource by lonnavmap clients like renderers. + +A resource only makes sense in the context of a navmap, as some of the data is stored in the navmap object. + +You will probably never need to instantiate this object directly. Use Apache::lonnavmap::navmap, and use the "start" method to obtain the starting resource. + +=head2 Public Members + +resource objects have a hash called DATA ($resourceRef->{DATA}) that you can store whatever you want in. This allows you to easily do two-pass algorithms without worrying about managing your own resource->data hash. + +=head2 Methods + +=over 4 + +=item * B($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 + +sub new { + # magic invocation to create a class instance + my $proto = shift; + my $class = ref($proto) || $proto; + my $self = {}; + + $self->{NAV_MAP} = shift; + $self->{ID} = shift; + + # Store this new resource in the parent nav map's cache. + $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 + # about this resource in. Not used by the resource object + # directly. + $self->{DATA} = {}; + + bless($self); + + return $self; +} + +# 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 +# second param +sub navHash { + my $self = shift; + my $param = shift; + my $id = shift; + return $self->{NAV_MAP}->{NAV_HASH}->{$param . ($id?$self->{ID}:"")}; +} + +=pod + +B + +These are methods that help you retrieve metadata about the resource: + +=over 4 + +=item * B: Returns true if the resource is external. + +=item * B: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B instead.) + +=item * B: Returns the kind of the resource from the compiled nav map. + +=item * B: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. + +=item * B: Returns true for a map if the randompick feature is being used on the map. (?) + +=item * B: Returns the source for the resource. + +=item * B: Returns the symb for the resource. + +=item * B: 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 +# resource information. +sub comesfrom { my $self=shift; return $self->navHash("comesfrom_", 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 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 { + my $self=shift; + return $self->navHash("src_", 1); +} +sub symb { + my $self=shift; + (my $first, my $second) = $self->{ID} =~ /(\d+).(\d+)/; + my $symbSrc = &Apache::lonnet::declutter($self->src()); + return &Apache::lonnet::declutter( + $self->navHash('map_id_'.$first)) + . '___' . $second . '___' . $symbSrc; +} +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 $src = $self->src(); + return ($src =~ /html$/); +} +sub is_map { my $self=shift; return defined($self->navHash("is_map_", 1)); } +sub is_page { + my $self=shift; + my $src = $self->src(); + return ($src =~ /page$/); +} +sub is_problem { + my $self=shift; + my $src = $self->src(); + return ($src =~ /problem$/); +} +sub is_sequence { + my $self=shift; + my $src = $self->src(); + return ($src =~ /sequence$/); +} + + + + + +# Move this into POD: In order to use these correctly, courseopt +# and useropt need to be generated +sub parmval { + my $self = shift; + my $what = shift; + my $part = shift || "0"; + return $self->{NAV_MAP}->parmval($part.'.'.$what, $self->symb()); +} +=pod +B<Map Methods> +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 map_finish { + my $self = shift; + my $src = $self->src(); + my $res = $self->navHash("map_finish_$src", 0); + $res = $self->{NAV_MAP}->getById($res); + return $res; +} +sub map_pc { + my $self = shift; + my $src = $self->src(); + return $self->navHash("map_pc_$src", 0); +} +sub map_start { + my $self = shift; + my $src = $self->src(); + my $res = $self->navHash("map_start_$src", 0); + $res = $self->{NAV_MAP}->getById($res); + return $res; +} +sub map_type { + my $self = shift; + my $pc = $self->map_pc(); + return $self->navHash("map_type_$pc", 0); +} + + + +##### +# Property queries +##### + +# These functions will be responsible for returning the CORRECT +# VALUE for the parameter, no matter what. So while they may look +# like direct calls to parmval, they can be more then that. +# So, for instance, the duedate function should use the "duedatetype" +# information, rather then the resource object user. + +=pod + +=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 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.) + +=over 4 + +=item * B<acc>: Get the Client IP/Name Access Control information. + +=item * B<answerdate>: Get the answer-reveal date for the problem. + +=item * B<duedate>: Get the due date for the problem. + +=item * B<tries>: Get the number of tries the student has used on the problem. + +=item * B<maxtries>: Get the number of max tries allowed. + +=item * B<opendate>: Get the open date for the problem. + +=item * B<sig>: Get the significant figures setting. + +=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<weight>: Get the weight for the problem. + +=back + +=cut + +sub acc { + (my $self, my $part) = @_; + return $self->parmval("acc", $part); +} +sub answerdate { + (my $self, my $part) = @_; + # Handle intervals + if ($self->parmval("answerdate.type", $part) eq 'date_interval') { + return $self->duedate($part) + + $self->parmval("answerdate", $part); + } + return $self->parmval("answerdate", $part); +} +sub duedate { + (my $self, my $part) = @_; + return $self->parmval("duedate", $part); +} +sub maxtries { + (my $self, my $part) = @_; + return $self->parmval("maxtries", $part); +} +sub opendate { + (my $self, my $part) = @_; + if ($self->parmval("opendate.type", $part) eq 'date_interval') { + return $self->duedate($part) - + $self->parmval("opendate", $part); + } + return $self->parmval("opendate"); +} +sub sig { + (my $self, my $part) = @_; + return $self->parmval("sig", $part); +} +sub tol { + (my $self, my $part) = @_; + return $self->parmval("tol", $part); +} +sub tries { + my $self = shift; + my $part = shift; + $part = '0' if (!defined($part)); + + # Make sure return hash is loaded, should error check + $self->getReturnHash(); + + my $tries = $self->{RETURN_HASH}->{'resource.'.$part.'.tries'}; + if (!defined($tries)) {return '0';} + 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 +sub getReturnHash { + my $self = shift; + + if (!defined($self->{RETURN_HASH})) { + my %tmpHash = &Apache::lonnet::restore($self->symb()); + $self->{RETURN_HASH} = \%tmpHash; + } +} + +###### +# Status queries +###### + +# These methods query the status of problems. + +# If we need to count parts, this function determines the number of +# parts from the metadata. When called, it returns a reference to a list +# of strings corresponding to the parts. (Thus, using it in a scalar context +# tells you how many parts you have in the problem: +# $partcount = scalar($resource->countParts()); +# Don't use $self->{PARTS} directly because you don't know if it's been +# computed yet. + +=pod + +=head2 Resource misc + +Misc. functions for the resource. + +=over 4 + +=item * B<hasDiscussion>: Returns a false value if there has been discussion since the user last logged in, true if there has. Always returns false if the discussion data was not extracted when the nav map was constructed. + +=item * B<getFeedback>: Gets the feedback for the resource and returns the raw feedback string for the resource, or the null string if there is no feedback or the email data was not extracted when the nav map was constructed. Usually used like this: + + for (split(/\,/, $res->getFeedback())) { + my $link = &Apache::lonnet::escape($_); + ... + +and use the link as appropriate. + +=cut + +sub hasDiscussion { + my $self = shift; + return $self->{NAV_MAP}->hasDiscussion($self->symb()); +} + +sub getFeedback { + my $self = shift; + return $self->{NAV_MAP}->getFeedback($self->src()); +} +=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. 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. Thus, B<parts> may return an array with fewer parts in it then countParts might lead you to believe. + +=back + +=cut + +sub parts { + my $self = shift; + + if ($self->ext) { return ['0']; } + + $self->extractParts(); + return $self->{PARTS}; +} + +sub countParts { + my $self = shift; + + my $parts = $self->parts(); + + if ($self->{RESOURCE_ERROR}) { + return 0; + } + + if (scalar(@{$parts}) < 2) { return 1;} + + return scalar(@{$parts}) - 1; +} + +# Private function: Extracts the parts information and saves it +sub extractParts { + my $self = shift; + + return if ($self->{PARTS}); + return if ($self->ext); + + $self->{PARTS} = []; + + # Retrieve part count, if this is a problem + if ($self->is_problem()) { + my $metadata = &Apache::lonnet::metadata($self->src(), 'allpossiblekeys'); + if (!$metadata) { + $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; + } + + return; +} + +=pod + +=head2 Resource Status + +Problem resources have status information, reflecting their various dates and completion statuses. You can obtain this information and import symbolic constants to represent the status. + +There are two aspects to the status: the date-related information and the completion information. + +Idiomatic usage of these two methods would probably look something like + + foreach ($resource->parts()) { + my $dateStatus = $resource->getDateStatus($_); + my $completionStatus = $resource->getCompletionStatus($_); + + or + + my $status = $resource->status($_); + + ... use it here ... + } + +=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. The possible return values are: + +=back + +B<Date Codes> + +=over 4 + +=item * B<OPEN_LATER>: The problem will be opened later. + +=item * B<OPEN>: Open and not yet due. + + +=item * B<PAST_DUE_ANSWER_LATER>: The due date has passed, but the answer date has not yet arrived. + +=item * B<PAST_DUE_NO_ANSWER>: The due date has passed and there is no answer opening date set. + +=item * B<ANSWER_OPEN>: The answer date is here. + +=item * B<NETWORK_FAILURE>: The information is unknown due to network failure. + +=back + +=cut + +# Apparently the compiler optimizes these into constants automatically +sub OPEN_LATER { return 0; } +sub OPEN { return 1; } +sub PAST_DUE_NO_ANSWER { return 2; } +sub PAST_DUE_ANSWER_LATER { return 3; } +sub ANSWER_OPEN { return 4; } +sub NOTHING_SET { return 5; } +sub NETWORK_FAILURE { return 100; } + +# getDateStatus gets the date status for a given problem part. +# Because answer date, due date, and open date are fully independent +# (i.e., it is perfectly possible to *only* have an answer date), +# we have to completely cover the 3x3 maxtrix of (answer, due, open) x +# (past, future, none given). This function handles this with a decision +# tree. Read the comments to follow the decision tree. + +sub getDateStatus { + my $self = shift; + my $part = shift; + $part = "0" if (!defined($part)); + + # Always return network failure if there was one. + return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE}); + + my $now = time(); + + my $open = $self->opendate($part); + my $due = $self->duedate($part); + my $answer = $self->answerdate($part); + + if (!$open && !$due && !$answer) { + # no data on the problem at all + # should this be the same as "open later"? think multipart. + return $self->NOTHING_SET; + } + if (!$open || $now < $open) {return $self->OPEN_LATER} + if (!$due || $now < $due) {return $self->OPEN} + if ($answer && $now < $answer) {return $self->PAST_DUE_ANSWER_LATER} + if ($answer) { return $self->ANSWER_OPEN; } + return PAST_DUE_NO_ANSWER; +} + +=pod + +B<> + +=over 4 + +=item * B<getCompletionStatus>($part): ($part defaults to 0.) A convenience function that returns a symbolic constant telling you about the completion status of the part, with the following possible results: + +=back + +B<Completion Codes> + +=over 4 + +=item * B<NOT_ATTEMPTED>: Has not been attempted at all. + +=item * B<INCORRECT>: Attempted, but wrong by student. + +=item * B<INCORRECT_BY_OVERRIDE>: Attempted, but wrong by instructor override. + +=item * B<CORRECT>: Correct or correct by instructor. + +=item * B<CORRECT_BY_OVERRIDE>: Correct by instructor override. + +=item * B<EXCUSED>: Excused. Not yet implemented. + +=item * B<NETWORK_FAILURE>: Information not available due to network failure. + +=item * B<ATTEMPTED>: Attempted, and not yet graded. + +=back + +=cut + +sub NOT_ATTEMPTED { return 10; } +sub INCORRECT { return 11; } +sub INCORRECT_BY_OVERRIDE { return 12; } +sub CORRECT { return 13; } +sub CORRECT_BY_OVERRIDE { return 14; } +sub EXCUSED { return 15; } +sub ATTEMPTED { return 16; } + +sub getCompletionStatus { + my $self = shift; + my $part = shift; + $part = "0" if (!defined($part)); + return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE}); + + # Make sure return hash exists + $self->getReturnHash(); + + my $status = $self->{RETURN_HASH}->{'resource.'.$part.'.solved'}; + + # Left as seperate if statements in case we ever do more with this + if ($status eq 'correct_by_student') {return $self->CORRECT;} + if ($status eq 'correct_by_override') {return $self->CORRECT_BY_OVERRIDE; } + if ($status eq 'incorrect_attempted') {return $self->INCORRECT; } + if ($status eq 'incorrect_by_override') {return $self->INCORRECT_BY_OVERRIDE; } + if ($status eq 'excused') {return $self->EXCUSED; } + if ($status eq 'ungraded_attempted') {return $self->ATTEMPTED; } + return $self->NOT_ATTEMPTED; +} + +=pod + +B<Composite Status> + +Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE()): + +=over 4 + +=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 * B<CORRECT>: For any reason at all, the part is considered correct. + +=item * B<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 * B<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 * B<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 * B<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 * B<ATTEMPTED>: The problem has been attempted. + +=back + +=cut + +sub TRIES_LEFT { return 10; } + +sub status { + my $self = shift; + my $part = shift; + if (!defined($part)) { $part = "0"; } + my $completionStatus = $self->getCompletionStatus($part); + my $dateStatus = $self->getDateStatus($part); + + # What we have is a two-dimensional matrix with 4 entries on one + # dimension and 5 entries on the other, which we want to colorize, + # plus network failure and "no date data at all". + + if ($completionStatus == NETWORK_FAILURE) { return NETWORK_FAILURE; } + + # There are a few whole rows we can dispose of: + if ($completionStatus == CORRECT || + $completionStatus == CORRECT_BY_OVERRIDE ) { + return CORRECT; + } + + if ($completionStatus == ATTEMPTED) { + return ATTEMPTED; + } + + # If it's EXCUSED, then return that no matter what + if ($completionStatus == EXCUSED) { + return EXCUSED; + } + + if ($dateStatus == NOTHING_SET) { + return NOTHING_SET; + } + + # Now we're down to a 4 (incorrect, incorrect_override, not_attempted) + # by 4 matrix (date statuses). + + if ($dateStatus == PAST_DUE_ANSWER_LATER || + $dateStatus == PAST_DUE_NO_ANSWER ) { + return $dateStatus; + } + + if ($dateStatus == ANSWER_OPEN) { + return ANSWER_OPEN; + } + + # Now: (incorrect, incorrect_override, not_attempted) x + # (open_later), (open) + + if ($dateStatus == OPEN_LATER) { + return OPEN_LATER; + } + + # If it's WRONG... + if ($completionStatus == INCORRECT || $completionStatus == INCORRECT_BY_OVERRIDE) { + # and there are TRIES LEFT: + if ($self->tries($part) < $self->maxtries($part) || !$self->maxtries($part)) { + return TRIES_LEFT; + } + return INCORRECT; # otherwise, return orange; student can't fix this + } + + # Otherwise, it's untried and open + return OPEN; +} + +=pod + +=head2 Resource/Nav Map Navigation + +=over 4 + +=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{$res->id()} is true in that hash, getNext will not return it in the list. In other words, you can use it to suppress resources you've already seen in the getNext method directly. + +=item * B<getPrevious>($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. + +=cut + +sub getNext { + my $self = shift; + my $alreadySeenHash = shift; + my @branches; + my $to = $self->to(); + foreach my $branch ( split(/,/, $to) ) { + my $choice = $self->{NAV_MAP}->getById($branch); + my $next = $choice->goesto(); + $next = $self->{NAV_MAP}->getById($next); + + # 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) || + !defined($alreadySeenHash->{$next->{ID}}) || + ($browsePriv ne '2' && $browsePriv ne 'F')) { + push @branches, $next; + } + } + 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 + +=back + +=cut + +1; + +__END__