--- loncom/interface/lonnavmaps.pm 2002/09/01 19:29:00 1.44 +++ loncom/interface/lonnavmaps.pm 2008/01/10 16:49:58 1.408 @@ -1,7 +1,7 @@ # The LearningOnline Network with CAPA # Navigate Maps Handler # -# $Id: lonnavmaps.pm,v 1.44 2002/09/01 19:29:00 www Exp $ +# $Id: lonnavmaps.pm,v 1.408 2008/01/10 16:49:58 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # @@ -25,83 +25,2318 @@ # # 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 GDBM_File; use Apache::loncommon(); -use HTML::TokeParser; +use Apache::lonenc(); +use Apache::lonlocal; +use Apache::lonnet; +use POSIX qw (floor strftime); +use Time::HiRes qw( gettimeofday tv_interval ); +use LONCAPA; +use DateTime(); + +# 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->PARTIALLY_CORRECT => 'navmap.partial.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 => '', + $resObj->PARTIALLY_CORRECT => '#006600' + ); +# And a special case in the nav map; what to do when the assignment +# is not yet done and due in less than 24 hours +my $hurryUpColor = "#FF0000"; + +sub close { + if ($env{'environment.remotenavmap'} ne 'on') { return ''; } + return(< +window.status='Accessing Nav Control'; +menu=window.open("/adm/rat/empty.html","loncapanav", + "height=600,width=400,scrollbars=1"); +window.status='Closing Nav Control'; +menu.close(); +window.status='Done.'; + +ENDCLOSE +} + +sub update { + if ($env{'environment.remotenavmap'} ne 'on') { return ''; } + if (!$env{'request.course.id'}) { return ''; } + if ($ENV{'REQUEST_URI'}=~m|^/adm/navmaps|) { return ''; } + return(< + +ENDUPDATE +} + +# 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. +sub getLinkForResource { + my $stack = shift; + my $res; + + # Check to see if there are any pages in the stack + foreach $res (@$stack) { + if (defined($res)) { + my $anchor; + if ($res->is_page()) { + foreach my $item (@$stack) { if (defined($item)) { $anchor = $item; } } + $anchor=&escape($anchor->shown_symb()); + return ($res->link(),$res->shown_symb(),$anchor); + } + # in case folder was skipped over as "only sequence" + my ($map,$id,$src)=&Apache::lonnet::decode_symb($res->symb()); + if ($map=~/\.page$/) { + my $url=&Apache::lonnet::clutter($map); + $anchor=&escape($src->shown_symb()); + return ($url,$res->shown_symb(),$anchor); + } + } + } + + # 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 my $item (@$stack) { + if (defined($item)) { $res = $item; } + } + + if ($res) { + return ($res->link(),$res->shown_symb()); + } + return; +} + +# 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); + + my $open = $res->opendate($part); + my $due = $res->duedate($part); + my $answer = $res->answerdate($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 == $res->OPEN_LATER) { + return "Open " .timeToHumanString($open,'start'); + } + if ($status == $res->OPEN) { + if ($due) { + if ($res->is_practice()) { + return &mt("Closes ")." " .timeToHumanString($due,'start'); + } else { + return &mt("Due")." " .timeToHumanString($due,'end'); + } + } else { + return &mt("Open, no due date"); + } + } + if ($status == $res->PAST_DUE_ANSWER_LATER) { + return &mt("Answer open")." " .timeToHumanString($answer,'start'); + } + if ($status == $res->PAST_DUE_NO_ANSWER) { + if ($res->is_practice()) { + return &mt("Closed")." " . timeToHumanString($due,'start'); + } else { + return &mt("Was due")." " . timeToHumanString($due,'end'); + } + } + if (($status == $res->ANSWER_OPEN || $status == $res->PARTIALLY_CORRECT) + && $res->handgrade($part) ne 'yes') { + 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 ($due) { + return &mt("Due")." " . timeToHumanString($due,'end') . + " $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 than +# 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 than 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,$type,$format) = @_; + + # 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(); + + # 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 than a minute + if ( $delta < $minute ) { + if ($delta == 1) { return "${prefix}1 second$tense"; } + return "$prefix$delta seconds$tense"; + } + + # Less than 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 than 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"; + } + + my $dt = DateTime->from_epoch(epoch => $time) + ->set_time_zone(&Apache::lonlocal::gettimezone()); + + # If there's a caller supplied format, use it. + + if ($format ne '') { + my $timeStr = $dt->strftime($format); + return $timeStr.' ('.$dt->time_zone_short_name().')'; + } + + # Less than 5 days away, display day of the week and + # HH:MM + + if ( $delta < $day * 5 ) { + my $timeStr = $dt->strftime("%A, %b %e at %I:%M %P (%Z)"); + $timeStr =~ s/12:00 am/00:00/; + $timeStr =~ s/12:00 pm/noon/; + return ($inPast ? "last " : "this ") . + $timeStr; + } + + my $conjunction='on'; + if ($type eq 'start') { + $conjunction='at'; + } elsif ($type eq 'end') { + $conjunction='by'; + } + # Is it this year? + my $dt_now = DateTime->from_epoch(epoch => $now) + ->set_time_zone(&Apache::lonlocal::gettimezone()); + if ( $dt->year() == $dt_now->year()) { + # Return on Month Day, HH:MM meridian + my $timeStr = $dt->strftime("$conjunction %A, %b %e at %I:%M %P (%Z)"); + $timeStr =~ s/12:00 am/00:00/; + $timeStr =~ s/12:00 pm/noon/; + return $timeStr; + } + + # Not this year, so show the year + my $timeStr = + $dt->strftime("$conjunction %A, %b %e %Y at %I:%M %P (%Z)"); + $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 than 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 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