loncom/interface/lonnavmaps.pm - diff

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Diff for /loncom/interface/lonnavmaps.pm between versions 1.100 and 1.108

version 1.100, 2002/11/08 19:10:58	version 1.108, 2002/11/15 18:10:22
Line 37	Line 37
# 3/1/1,6/1,17/1,29/1,30/1,2/8,9/21,9/24,9/25 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	# YEAR=2002
# 1/1 Gerd Kortemeyer	# 1/1 Gerd Kortemeyer
#	# Oct-Nov Jeremy Bowers

package Apache::lonnavmaps;	package Apache::lonnavmaps;

use strict;	use strict;
use Apache::Constants qw(:common :http);	use Apache::Constants qw(:common :http);
use Apache::lonnet();
use Apache::loncommon();	use Apache::loncommon();
use GDBM_File;
use POSIX qw (floor strftime);	use POSIX qw (floor strftime);

sub handler {	sub handler {
Line 73 sub handler {	Line 71 sub handler {
&Apache::loncommon::no_cache($r);	&Apache::loncommon::no_cache($r);
$r->send_http_header;	$r->send_http_header;

# Create the nav map the nav map	# Create the nav map
my $navmap = Apache::lonnavmaps::navmap->new(	my $navmap = Apache::lonnavmaps::navmap->new(
$ENV{"request.course.fn"}.".db",	$ENV{"request.course.fn"}.".db",
$ENV{"request.course.fn"}."_parms.db", 1, 1);	$ENV{"request.course.fn"}."_parms.db", 1, 1);
Line 89 sub handler {	Line 87 sub handler {
$r->print(&Apache::loncommon::bodytag('Navigate Course Map','',	$r->print(&Apache::loncommon::bodytag('Navigate Course Map','',
''));	''));
$r->print('<script>window.focus();</script>');	$r->print('<script>window.focus();</script>');
my $desc=$ENV{'course.'.$ENV{'request.course.id'}.'.description'};
$r->print('<table border="0" cellpadding="2" cellspacing="0">');	$r->print('<table border="0" cellpadding="2" cellspacing="0">');
my $date=localtime;	my $date=localtime;
$r->print('<tr><td align="right" valign="bottom">Key:  </td>');	$r->print('<tr><td align="right" valign="bottom">Key:  </td>');

	# Print discussions and feedback header
if ($navmap->{LAST_CHECK}) {	if ($navmap->{LAST_CHECK}) {
$r->print('<td align="center" valign="bottom">  '.	$r->print('<td align="center" valign="bottom">  '.
'<img src="/adm/lonMisc/chat.gif"> New discussion since '.	'<img src="/adm/lonMisc/chat.gif"> New discussion since '.
Line 107 sub handler {	Line 107 sub handler {
'</td>');	'</td>');
}	}
$r->print('</tr></table>');	$r->print('</tr></table>');

my $condition = 0;	my $condition = 0;
if ($ENV{'form.condition'}) {	if ($ENV{'form.condition'}) {
$condition = 1;	$condition = 1;
Line 135 sub handler {	Line 136 sub handler {
# is technically not proper, but should be harmless	# is technically not proper, but should be harmless
my $res = $navmap->firstResource();	my $res = $navmap->firstResource();

	# These are some data tables, which make it easy to change some of
	# of the specific visualization parameters if desired.

# Defines a status->color mapping, null string means don't color	# Defines a status->color mapping, null string means don't color
my %colormap =	my %colormap =
( $res->NETWORK_FAILURE => '',	( $res->NETWORK_FAILURE => '',
Line 192 sub handler {	Line 196 sub handler {
my $currenturl = $ENV{'form.postdata'};	my $currenturl = $ENV{'form.postdata'};
$currenturl=~s/^http\:\/\///;	$currenturl=~s/^http\:\/\///;
$currenturl=~s/^[^\/]+//;	$currenturl=~s/^[^\/]+//;

# alreadyHere allows us to only open the maps necessary to view	# alreadyHere allows us to only open the maps necessary to view
# the current location once, while at the same time remembering	# the current location once, while at the same time remembering
# the current location. Without that check, the user would never	# the current location. Without that check, the user would never
Line 210 sub handler {	Line 215 sub handler {
# Here's a simple example of the iterator.	# Here's a simple example of the iterator.
# Preprocess the map: Look for current URL, force inlined maps to display	# Preprocess the map: Look for current URL, force inlined maps to display

# This currently does very little...	my $mapIterator = $navmap->getIterator(undef, undef, \%filterHash, 1);
#my $mapEventualIterator = Apache::lonnavmaps::iterator->new($navmap, undef, undef, {},
#undef, $condition);

my $mapIterator = $navmap->getIterator(undef, undef, {}, 1);
my $found = 0;	my $found = 0;
my $depth = 1;	my $depth = 1;
my $currentUrlIndex = 0; # keeps track of when the current resource is found,	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	# so we can back up a few and put the anchor above the
# current resource	# current resource
	my $currentUrlDelta = 5; # change this to change how many resources are displayed
	# before the current resource when using #current
$mapIterator->next(); # discard the first BEGIN_MAP	$mapIterator->next(); # discard the first BEGIN_MAP
my $curRes = $mapIterator->next();	my $curRes = $mapIterator->next();
my $counter = 0;	my $counter = 0;
Line 237 sub handler {	Line 240 sub handler {
# show it by making sure the containing maps	# show it by making sure the containing maps
# are open.	# are open.

	# This is why we have to use the main iterator instead of the
	# potentially faster DFS: The count has to be the same, so
	# the order has to be the same, which DFS won't give us.
$currentUrlIndex = $counter;	$currentUrlIndex = $counter;

	# Ensure the parent maps are open
for my $map (@{$mapStack}) {	for my $map (@{$mapStack}) {
if ($condition) {	if ($condition) {
undef $filterHash{$map->map_pc()};	undef $filterHash{$map->map_pc()};
Line 286 sub handler {	Line 293 sub handler {

$counter = 0;	$counter = 0;

	# Print the 'current' anchor here if it would fall off the top
	if ($currentUrlIndex - $currentUrlDelta < 0) {
	$r->print('<a name="current" />');
	}

while ($depth > 0) {	while ($depth > 0) {
# If we're in a new style course, and this is a BEGIN_MAP, END_MAP, or	# If this is an inlined map, cancel the shift to the right,
# map resource and the stack depth is only one, just plain ignore this resource	# which has the effect of making the map look inlined
# entirely. (This has the effect of inlining the resources in that map
# in the nav map.)
if ($inlineTopLevelMaps && scalar(@{$mapIterator->getStack()}) == 1 &&	if ($inlineTopLevelMaps && scalar(@{$mapIterator->getStack()}) == 1 &&
ref($curRes) && $curRes->is_map()) {	ref($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;	$deltadepth = -1;
$curRes = $mapIterator->next();	$curRes = $mapIterator->next();
next;	next;
Line 319 sub handler {	Line 327 sub handler {
if ($depth == 1) { $deltadepth = 0; } # we're done shifting, because we're	if ($depth == 1) { $deltadepth = 0; } # we're done shifting, because we're
# out of the inlined map	# out of the inlined map

# Is this resource being blotted out?	# Is this resource being ignored because it is in a random-out
	# map and it was not selected?
if (ref($curRes) && !advancedUser() && $curRes->randomout()) {	if (ref($curRes) && !advancedUser() && $curRes->randomout()) {
$curRes = $mapIterator->next();	$curRes = $mapIterator->next();
next; # and totally ignore this resource	next; # if yes, then just ignore this resource
}	}

if (ref($curRes) && $curRes->src()) {	if (ref($curRes) && $curRes->src()) {
Line 333 sub handler {	Line 342 sub handler {
my $condensed = 0;	my $condensed = 0;

if ($curRes->is_problem()) {	if ($curRes->is_problem()) {
# Is it multipart?

	# Is it multipart?
if ($multipart) {	if ($multipart) {
# If it's multipart, see if part 0 is "open"	# If it's multipart, see if part 0 is "open"
# if it is, display all parts, if it isn't,	# if it is, display all parts, if it isn't,
# just display first	# just display first
if (!$curRes->opendate("0")) {	if (!$curRes->opendate("0")) {
@parts = ("0"); # just display the zero-th part	# no parts are open, display as one part
	@parts = ("0");
$condensed = 1;	$condensed = 1;
} else {	} else {
# Otherwise, only display part 0 if we want to	# Otherwise, only display part 0 if we want to
Line 348 sub handler {	Line 358 sub handler {
if ($curRes->hasDiscussion() \|\| $curRes->getFeedback()) {	if ($curRes->hasDiscussion() \|\| $curRes->getFeedback()) {
shift @parts;	shift @parts;
} else {	} else {
# If there's discussion or feedback, that counts
# as a difference, so display the parts.

# Now, we decide whether to condense the	# Now, we decide whether to condense the
# parts due to similarity	# parts due to similarity
my $status = $curRes->status($parts[1]);	my $status = $curRes->status($parts[1]);
Line 391 sub handler {	Line 398 sub handler {
} else {	} else {
$parts[0] = "0"; # this is to get past foreach loop below	$parts[0] = "0"; # this is to get past foreach loop below
# you can consider a non-problem resource as a resource	# you can consider a non-problem resource as a resource
# with only one part without loss	# with only one part without loss, and it simplifies the looping
}	}

# Is it a multipart problem with a single part, now in	# Is it a multipart problem with a single part, now in
# @parts with "0" filtered out? If so, forget it's a multi-part	# @parts with "0" filtered out? If so, 'forget' it's a multi-part
# problem and treat it like a single-part problem.	# problem and treat it like a single-part problem.
if ( scalar(@parts) == 1 ) {	if ( scalar(@parts) == 1 ) {
$multipart = 0;	$multipart = 0;
Line 403 sub handler {	Line 410 sub handler {

# Display one part, in event of network error.	# Display one part, in event of network error.
# If this is a single part, we can at least show the correct	# If this is a single part, we can at least show the correct
# status, but if it's multipart, we're lost.	# status, but if it's multipart, we're lost, since we can't
	# retreive the metadata to count the parts
if ($curRes->{RESOURCE_ERROR}) {	if ($curRes->{RESOURCE_ERROR}) {
@parts = ("0");	@parts = ("0");
}	}

# Step two: Show the parts	# Step Two: Print the actual data.

	# For each part we intend to display...
foreach my $part (@parts) {	foreach my $part (@parts) {

my $deltalevel = 0; # for inserting the branch icon	my $deltalevel = 0; # for inserting the branch icon
my $nonLinkedText = ""; # unlinked stuff after title	my $nonLinkedText = ""; # unlinked stuff after title

# For each thing we're displaying...

my $stack = $mapIterator->getStack();	my $stack = $mapIterator->getStack();
my $src = getLinkForResource($stack);	my $src = getLinkForResource($stack);

	# Pass the correct symb on the querystring, so the
	# remote will figure out where we are if we click a link
my $srcHasQuestion = $src =~ /\?/;	my $srcHasQuestion = $src =~ /\?/;
my $link = $src.	my $link = $src.
($srcHasQuestion?'&':'?') .	($srcHasQuestion?'&':'?') .
'symb='.&Apache::lonnet::escape($curRes->symb()).	'symb='.&Apache::lonnet::escape($curRes->symb()).
'"';	'"';
my $title = $curRes->title();
if (!$title) {	my $title = $curRes->compTitle();
$title = $curRes->src();
$title = substr ($title, rindex($title, "/") + 1);
}
my $partLabel = "";	my $partLabel = "";
my $newBranchText = "";	my $newBranchText = "";

# If this is a new branch, label it so	# If this is a new branch, label it so
# (temporary, this should be an icon w/ alt text)
if ($isNewBranch) {	if ($isNewBranch) {
$newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";	$newBranchText = "<img src=\"/adm/lonIcons/branch.gif\" border=\"0\">";
$isNewBranch = 0;	$isNewBranch = 0;
$deltalevel = 1;	$deltalevel = 1; # reserves space for the branch icon
}	}

# links to open and close the folders	# links to open and close the folders
Line 509 sub handler {	Line 515 sub handler {
# FIRST COL: The resource indentation, branch icon, name, and anchor	# FIRST COL: The resource indentation, branch icon, name, and anchor
$r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");	$r->print(" <tr bgcolor=\"$backgroundColor\"><td align=\"left\" valign=\"center\" width=\"60%\">\n");

# anchor for current resource... - 5 is deliberate: If it's that	# Print the anchor if necessary
# high on the screen, don't bother focusing on it. Also this will	if ($counter == $currentUrlIndex - $currentUrlDelta) {
# print multiple anchors if this is an expanded multi-part problem...
# who cares?
if ($counter == $currentUrlIndex - 5) {
$r->print('<a name="current" />');	$r->print('<a name="current" />');
}	}

Line 523 sub handler {	Line 526 sub handler {
}	}

$r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");	$r->print(" ${newBranchText}${linkopen}$icon${linkclose}\n");
	#$r->print($curRes->awarded($part));

my $curMarkerBegin = "";	my $curMarkerBegin = "";
my $curMarkerEnd = "";	my $curMarkerEnd = "";
Line 543 sub handler {	Line 547 sub handler {
}	}

$r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $curMarkerEnd $nonLinkedText");	$r->print(" $curMarkerBegin<a href=\"$link\">$title$partLabel</a> $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 ($curRes->{RESOURCE_ERROR}) {	if ($curRes->{RESOURCE_ERROR}) {
$r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",	$r->print(&Apache::loncommon::help_open_topic ("Navmap_Host_Down",
'<font size="-1">Host down</font>'));	'<font size="-1">Host down</font>'));
}	}

	# SECOND COL: Is there text, feedback, errors??
my $discussionHTML = ""; my $feedbackHTML = "";	my $discussionHTML = ""; my $feedbackHTML = "";

# SECOND COL: Is there text, feedback, errors??
if ($curRes->hasDiscussion()) {	if ($curRes->hasDiscussion()) {
$discussionHTML = $linkopen .	$discussionHTML = $linkopen .
'<img border="0" src="/adm/lonMisc/chat.gif" />' .	'<img border="0" src="/adm/lonMisc/chat.gif" />' .
Line 577 sub handler {	Line 578 sub handler {

# Is this the first displayed part of a multi-part problem	# Is this the first displayed part of a multi-part problem
# that has not been condensed, so we should suppress these two	# that has not been condensed, so we should suppress these two
# columns?	# columns so we don't display useless status info about part
	# "0"?
my $firstDisplayed = !$condensed && $multipart && $part eq "0";	my $firstDisplayed = !$condensed && $multipart && $part eq "0";

# THIRD COL: Problem status icon	# THIRD COL: Problem status icon
Line 595 sub handler {	Line 597 sub handler {
}	}

# FOURTH COL: Text description	# FOURTH COL: Text description
#$r->print("<td $colorizer align=\"right\" valign=\"center\">\n");
$r->print("<td align=\"right\" valign=\"center\">\n");	$r->print("<td align=\"right\" valign=\"center\">\n");

if ($curRes->kind() eq "res" &&	if ($curRes->kind() eq "res" &&
Line 727 sub getDescription {	Line 728 sub getDescription {
}	}
}	}

	# This puts a human-readable name on the ENV variable.
sub advancedUser {	sub advancedUser {
return $ENV{'user.adv'};	return $ENV{'user.adv'};
}	}
Line 772 sub timeToHumanString {	Line 774 sub timeToHumanString {
$delta = -$delta;	$delta = -$delta;
}	}

# Is it in the future?
if ( $delta > 0 ) {	if ( $delta > 0 ) {
# Is it less then a minute away?
my $tense = $inPast ? " ago" : "";	my $tense = $inPast ? " ago" : "";
my $prefix = $inPast ? "" : "in ";	my $prefix = $inPast ? "" : "in ";

	# Less then a minute
if ( $delta < $minute ) {	if ( $delta < $minute ) {
if ($delta == 1) { return "${prefix}1 second$tense"; }	if ($delta == 1) { return "${prefix}1 second$tense"; }
return "$prefix$delta seconds$tense";	return "$prefix$delta seconds$tense";
}	}

# Is it less then an hour away?	# Less then an hour
if ( $delta < $hour ) {	if ( $delta < $hour ) {
# If so, use minutes	# If so, use minutes
my $minutes = floor($delta / 60);	my $minutes = floor($delta / 60);
Line 876 sub new {	Line 879 sub new {
$self->{GENERATE_COURSE_USER_OPT} = shift;	$self->{GENERATE_COURSE_USER_OPT} = shift;
$self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;	$self->{GENERATE_EMAIL_DISCUSS_STATUS} = shift;

# Resource cache stores navmapresource's as we reference them. We generate	# Resource cache stores navmap resources as we reference them. We generate
# them on-demand so we don't pay for creating resources unless we use them.	# them on-demand so we don't pay for creating resources unless we use them.
$self->{RESOURCE_CACHE} = {};	$self->{RESOURCE_CACHE} = {};

Line 1029 sub courseMapDefined {	Line 1032 sub courseMapDefined {
sub getIterator {	sub getIterator {
my $self = shift;	my $self = shift;
my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,	my $iterator = Apache::lonnavmaps::iterator->new($self, shift, shift,
shift, undef, shift,	shift, undef, shift);
$ENV{'form.direction'});
return $iterator;	return $iterator;
}	}

Line 1121 sub finishResource {	Line 1123 sub finishResource {
return $self->getById($firstResource);	return $self->getById($firstResource);
}	}

# -------------------------------------------- Figure out a cascading parameter	# Parmval reads the parm hash and cascades the lookups. parmval_real does
#	# the actual lookup; parmval caches the results.
# For this function to work
#
# * parmhash needs to be tied
# * courseopt and useropt need to be initialized for this user and course
#

sub parmval {	sub parmval {
my $self = shift;	my $self = shift;
my ($what,$symb)=@_;	my ($what,$symb)=@_;
Line 1230 sub parmval_real {	Line 1226 sub parmval_real {

package Apache::lonnavmaps::iterator;	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	=pod

=back	=back
Line 1254 getIterator behaves as follows:	Line 1246 getIterator behaves as follows:

=over 4	=over 4

=item B<getIterator>(firstResource, finishResource, filterHash, condition, direction): All parameters are optional. firstResource is a resource reference corresponding to where the iterator should start. It defaults to navmap->firstResource() for the corresponding nav map. finishResource corresponds to where you want the iterator to end, defaulting to navmap->finishResource(). filterHash is a hash used as a set containing strings representing the resource IDs, defaulting to empty. Condition is a 1 or 0 that sets what to do with the filter hash: If a 0, then only resource that exist IN the filterHash will be recursed on. If it is a 1, only resources NOT in the filterHash will be recursed on. Defaults to 0, which is to say, do not recurse unless explicitly asked to. Direction specifies which direction to recurse, either FORWARD or BACKWARD, with FORWARD being default.	=item * B<getIterator>(firstResource, finishResource, filterHash, condition): 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.

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.	Thus, by default, only top-level resources will be shown. Change the condition to a 1 without changing the hash, and all resources will be shown. Changing the condition to 1 and including some values in the hash will allow you to selectively suppress parts of the navmap, while leaving it on 0 and adding things to the hash will allow you to selectively add parts of the nav map. See the handler code for examples.

The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:	The iterator will return either a reference to a resource object, or a token representing something in the map, such as the beginning of a new branch. The possible tokens are:

Line 1292 sub min {	Line 1284 sub min {
if ($a < $b) { return $a; } else { return $b; }	if ($a < $b) { return $a; } else { return $b; }
}	}

	# In the CVS repository, documentation of this algorithm is included
	# in /doc/lonnavdocs, as a PDF and .tex source. Markers like 1
	# will reference the same location in the text as the part of the
	# algorithm is running through.

sub new {	sub new {
# magic invocation to create a class instance	# magic invocation to create a class instance
my $proto = shift;	my $proto = shift;
Line 1334 sub new {	Line 1331 sub new {

my $maxDepth = 0; # tracks max depth	my $maxDepth = 0; # tracks max depth

	# 1

foreach my $pass (@iterations) {	foreach my $pass (@iterations) {
my $direction = $pass->[0];	my $direction = $pass->[0];
my $valName = $pass->[1];	my $valName = $pass->[1];
Line 1358 sub new {	Line 1357 sub new {
my $resultingVal = $curRes->{DATA}->{$valName};	my $resultingVal = $curRes->{DATA}->{$valName};
my $nextResources = $curRes->$nextResourceMethod();	my $nextResources = $curRes->$nextResourceMethod();
my $resourceCount = scalar(@{$nextResources});	my $resourceCount = scalar(@{$nextResources});

if ($resourceCount == 1) {	if ($resourceCount == 1) { # 3
my $current = $nextResources->[0]->{DATA}->{$valName} \|\| 999999999;	my $current = $nextResources->[0]->{DATA}->{$valName} \|\| 999999999;
$nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);	$nextResources->[0]->{DATA}->{$valName} = min($resultingVal, $current);
}	}

if ($resourceCount > 1) {	if ($resourceCount > 1) { # 4
foreach my $res (@{$nextResources}) {	foreach my $res (@{$nextResources}) {
my $current = $res->{DATA}->{$valName} \|\| 999999999;	my $current = $res->{DATA}->{$valName} \|\| 999999999;
$res->{DATA}->{$valName} = min($current, $resultingVal + 1);	$res->{DATA}->{$valName} = min($current, $resultingVal + 1);
Line 1372 sub new {	Line 1371 sub new {
}	}
}	}

# Assign the final val	# Assign the final val (2)
if (ref($curRes) && $direction == BACKWARD()) {	if (ref($curRes) && $direction == BACKWARD()) {
my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},	my $finalDepth = min($curRes->{DATA}->{TOP_DOWN_VAL},
$curRes->{DATA}->{BOT_UP_VAL});	$curRes->{DATA}->{BOT_UP_VAL});
Line 1394 sub new {	Line 1393 sub new {
push @{$self->{STACK}}, [];	push @{$self->{STACK}}, [];
}	}

# Prime the recursion w/ the first resource	# Prime the recursion w/ the first resource 5
push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};	push @{$self->{STACK}->[0]}, $self->{FIRST_RESOURCE};
$self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;	$self->{ALREADY_SEEN}->{$self->{FIRST_RESOURCE}->{ID}} = 1;

Line 1443 sub next {	Line 1442 sub next {
my $newDepth;	my $newDepth;
my $here;	my $here;
while ( $i >= 0 && !$found ) {	while ( $i >= 0 && !$found ) {
if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) {	if ( scalar(@{$self->{STACK}->[$i]}) > 0 ) { # 6
$here = $self->{HERE} = shift @{$self->{STACK}->[$i]};	$here = pop @{$self->{STACK}->[$i]}; # 7
$found = 1;	$found = 1;
$newDepth = $i;	$newDepth = $i;
}	}
Line 1462 sub next {	Line 1461 sub next {
}	}
}	}

	# If this is not a resource, it must be an END_BRANCH marker we want
	# to return directly.
	if (!ref($here)) { # 8
	if ($here == END_BRANCH()) { # paranoia, in case of later extension
	$self->{CURRENT_DEPTH}--;
	return $here;
	}
	}

	# Otherwise, it is a resource and it's safe to store in $self->{HERE}
	$self->{HERE} = $here;

# Get to the right level	# Get to the right level
if ( $self->{CURRENT_DEPTH} > $newDepth ) {	if ( $self->{CURRENT_DEPTH} > $newDepth ) {
push @{$self->{STACK}->[$newDepth]}, $here;	push @{$self->{STACK}->[$newDepth]}, $here;
Line 1481 sub next {	Line 1492 sub next {
# So we need to look at all the resources 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	# categorize them if we haven't seen them, remember if we have a new
my $nextUnfiltered = $here->getNext();	my $nextUnfiltered = $here->getNext();
	my $maxDepthAdded = -1;

for (@$nextUnfiltered) {	for (@$nextUnfiltered) {
if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {	if (!defined($self->{ALREADY_SEEN}->{$_->{ID}})) {
push @{$self->{STACK}->[$_->{DATA}->{DISPLAY_DEPTH}]}, $_;	my $depth = $_->{DATA}->{DISPLAY_DEPTH};
	push @{$self->{STACK}->[$depth]}, $_;
$self->{ALREADY_SEEN}->{$_->{ID}} = 1;	$self->{ALREADY_SEEN}->{$_->{ID}} = 1;
	if ($maxDepthAdded < $depth) { $maxDepthAdded = $depth; }
}	}
}	}

	# Is this the end of a branch? If so, all of the resources examined above
	# led to lower levels then the one we are currently at, so we push a END_BRANCH
	# marker onto the stack so we don't forget.
	# Example: For the usual A(BC)(DE)F case, when the iterator goes down the
	# BC branch and gets to C, it will see F as the only next resource, but it's
	# one level lower. Thus, this is the end of the branch, since there are no
	# more resources added to this level or above.
	my $isEndOfBranch = $maxDepthAdded < $self->{CURRENT_DEPTH};
	if ($isEndOfBranch) { # 9
	push @{$self->{STACK}->[$self->{CURRENT_DEPTH}]}, END_BRANCH();
	}

# That ends the main iterator logic. Now, do we want to recurse	# That ends the main iterator logic. Now, do we want to recurse
# down this map (if this resource is a map)?	# down this map (if this resource is a map)?
if ($self->{HERE}->is_map() &&	if ($self->{HERE}->is_map() &&
Line 1756 sub navHash {	Line 1782 sub navHash {

B<Metadata Retreival>	B<Metadata Retreival>

These are methods that help you retrieve metadata about the resource:	These are methods that help you retrieve metadata about the resource: Method names are based on the fields in the compiled course representation.

=over 4	=over 4

	=item * B<compTitle>: Returns a "composite title", that is equal to $res->title() if the resource has a title, and is otherwise the last part of the URL (e.g., "problem.problem").

=item * B<ext>: Returns true if the resource is external.	=item * B<ext>: Returns true if the resource is external.

=item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)	=item * B<goesto>: Returns the "goesto" value from the compiled nav map. (It is likely you want to use B<getNext> instead.)

=item * B<kind>: Returns the kind of the resource from the compiled nav map.	=item * B<kind>: Returns the kind of the resource from the compiled nav map.

=item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature.	=item * B<randomout>: Returns true if this resource was chosen to NOT be shown to the user by the random map selection feature. In other words, this is usually false.

=item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)	=item * B<randompick>: Returns true for a map if the randompick feature is being used on the map. (?)

Line 1809 sub symb {	Line 1837 sub symb {
}	}
sub title { my $self=shift; return $self->navHash("title_", 1); }	sub title { my $self=shift; return $self->navHash("title_", 1); }
sub to { my $self=shift; return $self->navHash("to_", 1); }	sub to { my $self=shift; return $self->navHash("to_", 1); }
	sub compTitle {
	my $self = shift;
	my $title = $self->title();
	if (!$title) {
	$title = $self->src();
	$title = substr($title, rindex($title, '/') + 1);
	}
	return $title;
	}
=pod	=pod

B<Predicate Testing the Resource>	B<Predicate Testing the Resource>
Line 1826 These methods are shortcuts to deciding	Line 1862 These methods are shortcuts to deciding

=item * B<is_problem>: Returns true if the resource is a problem.	=item * B<is_problem>: Returns true if the resource is a problem.

=item * B<is_sequence>: Returns true if the resource sequence.	=item * B<is_sequence>: Returns true if the resource is a sequence.

=back	=back

Line 1855 sub is_sequence {	Line 1891 sub is_sequence {
return ($src =~ /sequence$/);	return ($src =~ /sequence$/);
}	}

	# Private method: Shells out to the parmval in the nav map, handler parts.



# Move this into POD: In order to use these correctly, courseopt
# and useropt need to be generated
sub parmval {	sub parmval {
my $self = shift;	my $self = shift;
my $what = shift;	my $what = shift;
Line 1974 sub answerdate {	Line 2005 sub answerdate {
}	}
return $self->parmval("answerdate", $part);	return $self->parmval("answerdate", $part);
}	}
	sub awarded { my $self = shift; return $self->queryRestoreHash('awarded', shift); }
sub duedate {	sub duedate {
(my $self, my $part) = @_;	(my $self, my $part) = @_;
return $self->parmval("duedate", $part);	return $self->parmval("duedate", $part);
Line 1998 sub tol {	Line 2030 sub tol {
(my $self, my $part) = @_;	(my $self, my $part) = @_;
return $self->parmval("tol", $part);	return $self->parmval("tol", $part);
}	}
sub tries {	sub tries {
my $self = shift;	my $self = shift;
my $part = shift;	my $tries = $self->queryRestoreHash('tries', shift);
$part = '0' if (!defined($part));	if (!defined($tries)) { return '0';}

# 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;	return $tries;
}	}
sub type {	sub type {
Line 2143 sub extractParts {	Line 2169 sub extractParts {

=head2 Resource Status	=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.	Problem resources have status information, reflecting their various dates and completion statuses.

There are two aspects to the status: the date-related information and the completion information.	There are two aspects to the status: the date-related information and the completion information.

Line 2160 Idiomatic usage of these two methods wou	Line 2186 Idiomatic usage of these two methods wou
... use it here ...	... use it here ...
}	}

	Which you use depends on exactly what you are looking for. The status() function has been optimized for the nav maps display and may not precisely match what you need elsewhere.

	The symbolic constants shown below can be accessed through the resource object: $res->OPEN.

=over 4	=over 4

=item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:	=item * B<getDateStatus>($part): ($part defaults to 0). A convenience function that returns a symbolic constant telling you about the date status of the part. The possible return values are:
Line 2273 sub ATTEMPTED { return 16; }	Line 2303 sub ATTEMPTED { return 16; }

sub getCompletionStatus {	sub getCompletionStatus {
my $self = shift;	my $self = shift;
my $part = shift;
$part = "0" if (!defined($part));
return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});	return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});

# Make sure return hash exists	my $status = $self->queryRestoreHash('solved', shift);
$self->getReturnHash();

my $status = $self->{RETURN_HASH}->{'resource.'.$part.'.solved'};

# Left as seperate if statements in case we ever do more with this	# 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_student') {return $self->CORRECT;}
Line 2292 sub getCompletionStatus {	Line 2317 sub getCompletionStatus {
return $self->NOT_ATTEMPTED;	return $self->NOT_ATTEMPTED;
}	}

	sub queryRestoreHash {
	my $self = shift;
	my $hashentry = shift;
	my $part = shift;
	$part = "0" if (!defined($part));
	return $self->NETWORK_FAILURE if ($self->{NAV_MAP}->{NETWORK_FAILURE});

	$self->getReturnHash();

	return $self->{RETURN_HASH}->{'resource.'.$part.'.'.$hashentry};
	}

=pod	=pod

B<Composite Status>	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 ($res->NETWORK_FAILURE()):	Along with directly returning the date or completion status, the resource object includes a convenience function B<status>() that will combine the two status tidbits into one composite status that can represent the status of the resource as a whole. The precise logic is documented in the comments of the status method. The following results may be returned, all available as methods on the resource object ($res->NETWORK_FAILURE):

=over 4	=over 4

Line 2400 sub status {	Line 2437 sub status {

=over 4	=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<getNext>(): Retreive an array of the possible next resources after this one. Always returns an array, even in the one- or zero-element case.

=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.	=item * B<getPrevious>(): Retreive an array of the possible previous resources from this one. Always returns an array, even in the one- or zero-element case.

=cut	=cut

sub getNext {	sub getNext {
my $self = shift;	my $self = shift;
my $alreadySeenHash = shift;
my @branches;	my @branches;
my $to = $self->to();	my $to = $self->to();
foreach my $branch ( split(/,/, $to) ) {	foreach my $branch ( split(/,/, $to) ) {
Line 2416 sub getNext {	Line 2452 sub getNext {
my $next = $choice->goesto();	my $next = $choice->goesto();
$next = $self->{NAV_MAP}->getById($next);	$next = $self->{NAV_MAP}->getById($next);

# Don't remember it if we've already seen it or if	# Don't remember it if the student doesn't have browse priviledges
# the student doesn't have browse priviledges	# future note: this may properly belong in the client of the resource
my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);	my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
if (!defined($alreadySeenHash) \|\|	if (!($browsePriv ne '2' && $browsePriv ne 'F')) {
!defined($alreadySeenHash->{$next->{ID}}) \|\|	push @branches, $next;
($browsePriv ne '2' && $browsePriv ne 'F')) {	}
push @branches, $next;
}
}	}
return \@branches;	return \@branches;
}	}

sub getPrevious {	sub getPrevious {
my $self = shift;	my $self = shift;
my $alreadySeenHash = shift;
my @branches;	my @branches;
my $from = $self->from();	my $from = $self->from();
foreach my $branch ( split /,/, $from) {	foreach my $branch ( split /,/, $from) {
Line 2438 sub getPrevious {	Line 2471 sub getPrevious {
my $prev = $choice->comesfrom();	my $prev = $choice->comesfrom();
$prev = $self->{NAV_MAP}->getById($prev);	$prev = $self->{NAV_MAP}->getById($prev);

# Skip it if we've already seen it or the user doesn't have	# Don't remember it if the student doesn't have browse priviledges
# browse privs	# future note: this may properly belong in the client of the resource
my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);	my $browsePriv = &Apache::lonnet::allowed('bre', $self->src);
if (!defined($alreadySeenHash) \|\|	if (!($browsePriv ne '2' && $browsePriv ne 'F')) {
!defined($alreadySeenHash->{$prev->{ID}}) \|\|
($browsePriv ne '2' && $browsePriv ne 'F')) {
push @branches, $prev;	push @branches, $prev;
}	}
}	}

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Removed from v.1.100
changed lines
	Added in v.1.108