--- loncom/interface/lonnavmaps.pm 2002/03/15 21:56:11 1.30 +++ loncom/interface/lonnavmaps.pm 2004/07/03 20:45:23 1.265 @@ -1,7 +1,7 @@ # The LearningOnline Network with CAPA # Navigate Maps Handler # -# $Id: lonnavmaps.pm,v 1.30 2002/03/15 21:56:11 albertel Exp $ +# $Id: lonnavmaps.pm,v 1.265 2004/07/03 20:45:23 albertel Exp $ # # Copyright Michigan State University Board of Trustees # @@ -25,73 +25,2071 @@ # # http://www.lon-capa.org/ # -# (Page Handler -# -# (TeX Content Handler -# -# 05/29/00,05/30 Gerd Kortemeyer) -# 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) -# -# 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 Gerd Kortemeyer -# YEAR=2002 -# 1/1 Gerd Kortemeyer -# +### package Apache::lonnavmaps; use strict; use Apache::Constants qw(:common :http); -use Apache::lonnet(); use Apache::loncommon(); -use HTML::TokeParser; +use Apache::lonmenu(); +use Apache::lonlocal; +use POSIX qw (floor strftime); +use Data::Dumper; # for debugging, not always used + +# symbolic constants +sub SYMB { return 1; } +sub URL { return 2; } +sub NOTHING { return 3; } + +# Some data + +my $resObj = "Apache::lonnavmaps::resource"; + +# Keep these mappings in sync with lonquickgrades, which uses the colors +# instead of the icons. +my %statusIconMap = + ( + $resObj->CLOSED => '', + $resObj->OPEN => 'navmap.open.gif', + $resObj->CORRECT => 'navmap.correct.gif', + $resObj->INCORRECT => 'navmap.wrong.gif', + $resObj->ATTEMPTED => 'navmap.ellipsis.gif', + $resObj->ERROR => '' + ); + +my %iconAltTags = + ( 'navmap.correct.gif' => 'Correct', + 'navmap.wrong.gif' => 'Incorrect', + 'navmap.open.gif' => 'Open' ); + +# Defines a status->color mapping, null string means don't color +my %colormap = + ( $resObj->NETWORK_FAILURE => '', + $resObj->CORRECT => '', + $resObj->EXCUSED => '#3333FF', + $resObj->PAST_DUE_ANSWER_LATER => '', + $resObj->PAST_DUE_NO_ANSWER => '', + $resObj->ANSWER_OPEN => '#006600', + $resObj->OPEN_LATER => '', + $resObj->TRIES_LEFT => '', + $resObj->INCORRECT => '', + $resObj->OPEN => '', + $resObj->NOTHING_SET => '', + $resObj->ATTEMPTED => '', + $resObj->ANSWER_SUBMITTED => '' + ); +# 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"; + +sub handler { + my $r = shift; + real_handler($r); +} + +sub real_handler { + my $r = shift; + + # Handle header-only request + if ($r->header_only) { + if ($ENV{'browser.mathml'}) { + &Apache::loncommon::content_type($r,'text/xml'); + } else { + &Apache::loncommon::content_type($r,'text/html'); + } + $r->send_http_header; + return OK; + } + + # Send header, don't cache this page + if ($ENV{'browser.mathml'}) { + &Apache::loncommon::content_type($r,'text/xml'); + } else { + &Apache::loncommon::content_type($r,'text/html'); + } + &Apache::loncommon::no_cache($r); + $r->send_http_header; + + # Create the nav map + my $navmap = Apache::lonnavmaps::navmap->new(); + + if (!defined($navmap)) { + my $requrl = $r->uri; + $ENV{'user.error.msg'} = "$requrl:bre:0:0:Course not initialized"; + return HTTP_NOT_ACCEPTABLE; + } + + $r->print("\n"); + $r->print("".&mt('Navigate Course Contents').""); +# ------------------------------------------------------------ Get query string + &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},['register']); + +# ----------------------------------------------------- Force menu registration + my $addentries=''; + if ($ENV{'form.register'}) { + $addentries=' onLoad="'.&Apache::lonmenu::loadevents(). + '" onUnload="'.&Apache::lonmenu::unloadevents().'"'; + $r->print(&Apache::lonmenu::registerurl(1)); + } + + # Header + $r->print(''. + &Apache::loncommon::bodytag('Navigate Course Contents','', + $addentries,'','',$ENV{'form.register'})); + $r->print(''. + &Apache::loncommon::help_open_menu('','Navigation Screen','Navigation_Screen','',undef,'RAT')); + + $r->rflush(); + + # Check that it's defined + if (!($navmap->courseMapDefined())) { + $r->print('Coursemap undefined.' . + ''); + return OK; + } + + # See if there's only one map in the top-level, if we don't + # already have a filter... if so, automatically display it + # (older code; should use retrieveResources) + if ($ENV{QUERY_STRING} !~ /filter/) { + my $iterator = $navmap->getIterator(undef, undef, undef, 0); + my $curRes; + my $sequenceCount = 0; + my $sequenceId; + while ($curRes = $iterator->next()) { + if (ref($curRes) && $curRes->is_sequence()) { + $sequenceCount++; + $sequenceId = $curRes->map_pc(); + } + } + + if ($sequenceCount == 1) { + # The automatic iterator creation in the render call + # will pick this up. We know the condition because + # the defined($ENV{'form.filter'}) also ensures this + # is a fresh call. + $ENV{'form.filter'} = "$sequenceId"; + } + } + + my $jumpToFirstHomework = 0; + # Check to see if the student is jumping to next open, do-able problem + if ($ENV{QUERY_STRING} eq 'jumpToFirstHomework') { + $jumpToFirstHomework = 1; + # Find the next homework problem that they can do. + my $iterator = $navmap->getIterator(undef, undef, undef, 1); + my $curRes; + my $foundDoableProblem = 0; + my $problemRes; + + while (($curRes = $iterator->next()) && !$foundDoableProblem) { + if (ref($curRes) && $curRes->is_problem()) { + my $status = $curRes->status(); + if ($curRes->completable()) { + $problemRes = $curRes; + $foundDoableProblem = 1; + + # Pop open all previous maps + my $stack = $iterator->getStack(); + pop @$stack; # last resource in the stack is the problem + # itself, which we don't need in the map stack + my @mapPcs = map {$_->map_pc()} @$stack; + $ENV{'form.filter'} = join(',', @mapPcs); + + # Mark as both "here" and "jump" + $ENV{'form.postsymb'} = $curRes->symb(); + } + } + } + + # If we found no problems, print a note to that effect. + if (!$foundDoableProblem) { + $r->print("All homework assignments have been completed.

"); + } + } else { + $r->print("" . + &mt("Go To My First Homework Problem")."    "); + } + + my $suppressEmptySequences = 0; + my $filterFunc = undef; + my $resource_no_folder_link = 0; + + # Display only due homework. + my $showOnlyHomework = 0; + if ($ENV{QUERY_STRING} eq 'showOnlyHomework') { + $showOnlyHomework = 1; + $suppressEmptySequences = 1; + $filterFunc = sub { my $res = shift; + return $res->completable() || $res->is_map(); + }; + $r->print("

".&mt("Uncompleted Homework")."

"); + $ENV{'form.filter'} = ''; + $ENV{'form.condition'} = 1; + $resource_no_folder_link = 1; + } else { + $r->print("" . + &mt("Show Only Uncompleted Homework")."    "); + } + + # renderer call + my $renderArgs = { 'cols' => [0,1,2,3], + 'url' => '/adm/navmaps', + 'navmap' => $navmap, + 'suppressNavmap' => 1, + 'suppressEmptySequences' => $suppressEmptySequences, + 'filterFunc' => $filterFunc, + 'resource_no_folder_link' => $resource_no_folder_link, + 'r' => $r}; + my $render = render($renderArgs); + $navmap->untieHashes(); + + # If no resources were printed, print a reassuring message so the + # user knows there was no error. + if ($renderArgs->{'counter'} == 0) { + if ($showOnlyHomework) { + $r->print("

".&mt("All homework is currently completed").".

"); + } else { # both jumpToFirstHomework and normal use the same: course must be empty + $r->print("

This course is empty.

"); + } + } + + $r->print(""); + $r->rflush(); + + return OK; +} + +# 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; + + return join (",", keys(%hash)); +} + +sub removeFromFilter { + my $hashIn = shift; + my $subtraction = shift; + my %hash = %$hashIn; + + 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($res)) { + if ($res->is_page()) { + return $res->src(); + } + # in case folder was skipped over as "only sequence" + my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb()); + if ($map=~/\.page$/) { + return &Apache::lonnet::clutter($map).'#'. + &Apache::lonnet::escape(&Apache::lonnet::declutter($src)); + } + } + } + + # 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 = $_; } + } + + return $res->src(); +} + +# Convenience function: This separates the logic of how to create +# the problem text strings ("Due: DATE", "Open: DATE", "Not yet assigned", +# etc.) into a separate 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 == $res->NETWORK_FAILURE) { + return &mt("Having technical difficulties; please check status later"); + } + if ($status == $res->NOTHING_SET) { + return &mt("Not currently assigned."); + } + if ($status == $res->OPEN_LATER) { + return "Open " . timeToHumanString($res->opendate($part)); + } + if ($status == $res->OPEN) { + if ($res->duedate($part)) { + return &mt("Due")." " .timeToHumanString($res->duedate($part)); + } else { + return &mt("Open, no due date"); + } + } + if ($status == $res->PAST_DUE_ANSWER_LATER) { + return &mt("Answer open")." " . timeToHumanString($res->answerdate($part)); + } + if ($status == $res->PAST_DUE_NO_ANSWER) { + return &mt("Was due")." " . timeToHumanString($res->duedate($part)); + } + if ($status == $res->ANSWER_OPEN) { + return &mt("Answer available"); + } + if ($status == $res->EXCUSED) { + return &mt("Excused by instructor"); + } + if ($status == $res->ATTEMPTED) { + return &mt("Answer submitted, not yet graded"); + } + if ($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 ($res->duedate($part)) { + return &mt("Due")." " . timeToHumanString($res->duedate($part)) . + " $triesString"; + } else { + return &mt("No due date")." $triesString"; + } + } + if ($status == $res->ANSWER_SUBMITTED) { + return &mt('Answer submitted'); + } +} + +# Convenience function, so others can use it: Is the problem due in less then +# 24 hours, and still can be done? + +sub dueInLessThan24Hours { + my $res = shift; + my $part = shift; + my $status = $res->status($part); + + return ($status == $res->OPEN() || + $status == $res->TRIES_LEFT()) && + $res->duedate($part) && $res->duedate($part) < time()+(24*60*60) && + $res->duedate($part) > time(); +} + +# Convenience function, so others can use it: Is there only one try remaining for the +# part, with more then one try to begin with, not due yet and still can be done? +sub lastTry { + my $res = shift; + my $part = shift; + + my $tries = $res->tries($part); + my $maxtries = $res->maxtries($part); + return $tries && $maxtries && $maxtries > 1 && + $maxtries - $tries == 1 && $res->duedate($part) && + $res->duedate($part) > time(); +} + +# This puts a human-readable name on the ENV variable. + +sub advancedUser { + return $ENV{'request.role.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 (!$time) { + return &mt('never'); + } + unless (&Apache::lonlocal::current_language()=~/^en/) { + return &Apache::lonlocal::locallocaltime($time); + } + 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; + } + + if ( $delta > 0 ) { + + my $tense = $inPast ? " ago" : ""; + my $prefix = $inPast ? "" : "in "; + + # Less then a minute + if ( $delta < $minute ) { + if ($delta == 1) { return "${prefix}1 second$tense"; } + return "$prefix$delta seconds$tense"; + } + + # Less then an hour + 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/00:00/; + $timeStr =~ s/12:00 pm/noon/; + return ($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/00:00/; + $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/00:00/; + $timeStr =~ s/12:00 pm/noon/; + return $timeStr; + } +} + + +=pod + +=head1 NAME + +Apache::lonnavmap - Subroutines to handle and render the navigation + maps + +=head1 SYNOPSIS + +The main handler generates the navigational listing for the course, +the other objects export this information in a usable fashion for +other modules. + +=head1 OVERVIEW + +X When a user enters a course, LON-CAPA examines the +course structure and caches it in what is often referred to as the +"big hash" X. You can see it if you are logged into +LON-CAPA, in a course, by going to /adm/test. (You may need to +tweak the /home/httpd/lonTabs/htpasswd file to view it.) The +content of the hash will be under the heading "Big Hash". + +Big Hash contains, among other things, how resources are related +to each other (next/previous), what resources are maps, which +resources are being chosen to not show to the student (for random +selection), and a lot of other things that can take a lot of time +to compute due to the amount of data that needs to be collected and +processed. + +Apache::lonnavmaps provides an object model for manipulating this +information in a higher-level fashion then directly manipulating +the hash. It also provides access to several auxilary functions +that aren't necessarily stored in the Big Hash, but are a per- +resource sort of value, like whether there is any feedback on +a given resource. + +Apache::lonnavmaps also abstracts away branching, and someday, +conditions, for the times where you don't really care about those +things. + +Apache::lonnavmaps also provides fairly powerful routines for +rendering navmaps, and last but not least, provides the navmaps +view for when the user clicks the NAV button. + +B: Apache::lonnavmaps I works for the "currently +logged in user"; if you want things like "due dates for another +student" lonnavmaps can not directly retrieve information like +that. You need the EXT function. This module can still help, +because many things, such as the course structure, are constant +between users, and Apache::lonnavmaps can help by providing +symbs for the EXT call. + +The rest of this file will cover the provided rendering routines, +which can often be used without fiddling with the navmap object at +all, then documents the Apache::lonnavmaps::navmap object, which +is the key to accessing the Big Hash information, covers the use +of the Iterator (which provides the logic for traversing the +somewhat-complicated Big Hash data structure), documents the +Apache::lonnavmaps::Resource objects that are returned by + +=head1 Subroutine: render + +The navmap renderer package provides a sophisticated rendering of the +standard navigation maps interface into HTML. The provided nav map +handler is actually just a glorified call to this. + +Because of the large number of parameters this function accepts, +instead of passing it arguments as is normal, pass it in an anonymous +hash with the desired options. + +The package provides a function called 'render', called as +Apache::lonnavmaps::render({}). + +=head2 Overview of Columns + +The renderer will build an HTML table for the navmap and return +it. The table is consists of several columns, and a row for each +resource (or possibly each part). You tell the renderer how many +columns to create and what to place in each column, optionally using +one or more of the prepared columns, and the renderer will assemble +the table. + +Any additional generally useful column types should be placed in the +renderer code here, so anybody can use it anywhere else. Any code +specific to the current application (such as the addition of +elements in a column) should be placed in the code of the thing using +the renderer. + +At the core of the renderer is the array reference COLS (see Example +section below for how to pass this correctly). The COLS array will +consist of entries of one of two types of things: Either an integer +representing one of the pre-packaged column types, or a sub reference +that takes a resource reference, a part number, and a reference to the +argument hash passed to the renderer, and returns a string that will +be inserted into the HTML representation as it. + +All other parameters are ways of either changing how the columns +are printing, or which rows are shown. + +The pre-packaged column names are refered to by constants in the +Apache::lonnavmaps namespace. The following currently exist: + +=over 4 + +=item * B: + +The general info about the resource: Link, icon for the type, etc. The +first column in the standard nav map display. This column provides the +indentation effect seen in the B