# The LearningOnline Network with CAPA
#
# $Id: lonstathelpers.pm,v 1.17 2004/06/25 21:02:41 matthew 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/
#
####################################################
####################################################
=pod
=head1 NAME
Apache::lonstathelpers - helper routines used by statistics
=head1 SYNOPSIS
This module provides a place to consolidate much of the statistics
routines that are needed across multiple statistics functions.
=head1 OVERVIEW
=over 4
=cut
####################################################
####################################################
package Apache::lonstathelpers;
use strict;
use Apache::lonnet();
use Apache::loncommon();
use Apache::lonhtmlcommon();
use Apache::loncoursedata();
use Apache::lonstatistics;
use Apache::lonlocal;
use HTML::Entities();
use Time::Local();
use Spreadsheet::WriteExcel();
use GDBM_File;
use Storable qw(freeze thaw);
####################################################
####################################################
=pod
=item &render_resource($resource)
Input: a resource generated from
&Apache::loncoursedata::get_sequence_assessment_data().
Retunrs: a scalar containing html for a rendering of the problem
within a table.
=cut
####################################################
####################################################
sub render_resource {
my ($resource) = @_;
##
## Render the problem
my $base;
($base,undef) = ($resource->{'src'} =~ m|(.*/)[^/]*$|);
$base = "http://".$ENV{'SERVER_NAME'}.$base;
my $rendered_problem =
&Apache::lonnet::ssi_body($resource->{'src'});
$rendered_problem =~ s/<\s*form\s*/<nop /g;
$rendered_problem =~ s|(<\s*/form\s*>)|<\/nop>|g;
return '<table bgcolor="ffffff"><tr><td>'.
'<base href="'.$base.'" />'.
$rendered_problem.
'</td></tr></table>';
}
####################################################
####################################################
=pod
=item &ProblemSelector($AcceptedResponseTypes)
Input: scalar containing regular expression which matches response
types to show. '.' will yield all, '(option|radiobutton)' will match
all option response and radiobutton problems.
Returns: A string containing html for a table which lists the sequences
and their contents. A radiobutton is provided for each problem.
Skips 'survey' problems.
=cut
####################################################
####################################################
sub ProblemSelector {
my ($AcceptedResponseTypes) = @_;
my $Str;
$Str = "\n<table>\n";
foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess('all')) {
next if ($seq->{'num_assess'}<1);
my $seq_str = '';
foreach my $res (@{$seq->{'contents'}}) {
next if ($res->{'type'} ne 'assessment');
foreach my $part (@{$res->{'parts'}}) {
my $partdata = $res->{'partdata'}->{$part};
next if ($partdata->{'Survey'});
for (my $i=0;$i<scalar(@{$partdata->{'ResponseTypes'}});$i++){
my $respid = $partdata->{'ResponseIds'}->[$i];
my $resptype = $partdata->{'ResponseTypes'}->[$i];
if ($resptype =~ m/$AcceptedResponseTypes/) {
my $value = &make_target_id({symb=>$res->{'symb'},
part=>$part,
respid=>$respid,
resptype=>$resptype});
my $checked = '';
if ($ENV{'form.problemchoice'} eq $value) {
$checked = 'checked ';
}
my $title = $res->{'title'};
if (! defined($title) || $title eq '') {
($title) = ($res->{'src'} =~ m:/([^/]*)$:);
}
$seq_str .= '<tr><td>'.
'<input type="radio" name="problemchoice" value="'.$value.'" '.$checked.'/>'.
'</td><td>'.
$resptype.'</td><td>'.
'<a href="'.$res->{'src'}.'">'.$title.'</a> ';
# '<a href="'.$res->{'src'}.'">'.$resptype.' '.$res->{'title'}.'</a> ';
if (scalar(@{$partdata->{'ResponseIds'}}) > 1) {
$seq_str .= &mt('response').' '.$respid;
}
$seq_str .= "</td></tr>\n";
}
}
}
}
if ($seq_str ne '') {
$Str .= '<tr><td> </td><td colspan="2"><b>'.$seq->{'title'}.'</b></td>'.
"</tr>\n".$seq_str;
}
}
$Str .= "</table>\n";
return $Str;
}
####################################################
####################################################
=pod
=item &make_target_id($target)
Inputs: Hash ref with the following entries:
$target->{'symb'}, $target->{'part'}, $target->{'respid'},
$target->{'resptype'}.
Returns: A string, suitable for a form parameter, which uniquely identifies
the problem, part, and response to do statistical analysis on.
Used by Apache::lonstathelpers::ProblemSelector().
=cut
####################################################
####################################################
sub make_target_id {
my ($target) = @_;
my $id = &Apache::lonnet::escape($target->{'symb'}).':'.
&Apache::lonnet::escape($target->{'part'}).':'.
&Apache::lonnet::escape($target->{'respid'}).':'.
&Apache::lonnet::escape($target->{'resptype'});
return $id;
}
####################################################
####################################################
=pod
=item &get_target_from_id($id)
Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
Returns: A hash reference, $target, containing the following keys:
$target->{'symb'}, $target->{'part'}, $target->{'respid'},
$target->{'resptype'}.
=cut
####################################################
####################################################
sub get_target_from_id {
my ($id) = @_;
my ($symb,$part,$respid,$resptype) = split(':',$id);
return ({ symb =>&Apache::lonnet::unescape($symb),
part =>&Apache::lonnet::unescape($part),
respid =>&Apache::lonnet::unescape($respid),
resptype =>&Apache::lonnet::unescape($resptype)});
}
####################################################
####################################################
=pod
=item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
Determine the problem parts or responses preceeding and following the
current resource.
Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
$AcceptableResponseTypes, regular expression matching acceptable
response types,
$granularity, either 'part', 'response', or 'part_survey'
Returns: three hash references, $prev, $curr, $next, which refer to the
preceeding, current, or following problem parts or responses, depending
on the value of $granularity. Values of undef indicate there is no
previous or next part/response. A value of undef for all three indicates
there was no match found to the current part/resource.
The hash references contain the following keys:
symb, part, resource
If $granularity eq 'response', the following ADDITIONAL keys will be present:
respid, resptype
=cut
####################################################
####################################################
sub get_prev_curr_next {
my ($target,$AcceptableResponseTypes,$granularity) = @_;
#
# Build an array with the data we need to search through
my @Resource;
foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess('all')) {
foreach my $res (@{$seq->{'contents'}}) {
next if ($res->{'type'} ne 'assessment');
foreach my $part (@{$res->{'parts'}}) {
my $partdata = $res->{'partdata'}->{$part};
if ($partdata->{'Survey'}) {
if ($granularity eq 'part_survey'){
push (@Resource,
{ symb => $res->{symb},
part => $part,
resource => $res,
} );
}
} elsif ($granularity eq 'part') {
push (@Resource,
{ symb => $res->{symb},
part => $part,
resource => $res,
} );
} elsif ($granularity eq 'response') {
for (my $i=0;
$i<scalar(@{$partdata->{'ResponseTypes'}});
$i++){
my $respid = $partdata->{'ResponseIds'}->[$i];
my $resptype = $partdata->{'ResponseTypes'}->[$i];
next if ($resptype !~ m/$AcceptableResponseTypes/);
push (@Resource,
{ symb => $res->{symb},
part => $part,
respid => $partdata->{'ResponseIds'}->[$i],
resource => $res,
resptype => $resptype
} );
}
}
}
}
}
#
# Get the index of the current situation
my $curr_idx;
for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
my $curr_item = $Resource[$curr_idx];
if ($granularity eq 'part' || $granularity eq 'part_survey') {
if ($curr_item->{'symb'} eq $target->{'symb'} &&
$curr_item->{'part'} eq $target->{'part'}) {
last;
}
} elsif ($granularity eq 'response') {
if ($curr_item->{'symb'} eq $target->{'symb'} &&
$curr_item->{'part'} eq $target->{'part'} &&
$curr_item->{'respid'} eq $target->{'respid'} &&
$curr_item->{'resptype'} eq $target->{'resptype'}) {
last;
}
}
}
my $curr_item = $Resource[$curr_idx];
if ($granularity eq 'part' || $granularity eq 'part_survey') {
if ($curr_item->{'symb'} ne $target->{'symb'} ||
$curr_item->{'part'} ne $target->{'part'}) {
# bogus symb - return nothing
return (undef,undef,undef);
}
} elsif ($granularity eq 'response') {
if ($curr_item->{'symb'} ne $target->{'symb'} ||
$curr_item->{'part'} ne $target->{'part'} ||
$curr_item->{'respid'} ne $target->{'respid'} ||
$curr_item->{'resptype'} ne $target->{'resptype'}){
# bogus symb - return nothing
return (undef,undef,undef);
}
}
#
# Now just pick up the data we need
my ($prev,$curr,$next);
if ($curr_idx == 0) {
$prev = undef;
$curr = $Resource[$curr_idx ];
$next = $Resource[$curr_idx+1];
} elsif ($curr_idx == $#Resource) {
$prev = $Resource[$curr_idx-1];
$curr = $Resource[$curr_idx ];
$next = undef;
} else {
$prev = $Resource[$curr_idx-1];
$curr = $Resource[$curr_idx ];
$next = $Resource[$curr_idx+1];
}
return ($prev,$curr,$next);
}
#####################################################
#####################################################
=pod
=item GetStudentAnswers($r,$problem,$Students)
Determines the correct answer for a set of students on a given problem.
The students answers are stored in the student hashes pointed to by the
array @$Students under the key 'answer'.
Inputs: $r
$problem: hash reference containing the keys 'resource', 'part', and 'respid'.
$Students: reference to array containing student hashes (need 'username',
'domain').
Returns: nothing
=cut
#####################################################
#####################################################
sub GetStudentAnswers {
my ($r,$problem,$Students,$formname,$inputname) = @_;
my $status_type;
if (defined($formname)) {
$status_type = 'inline';
} else {
$status_type = 'popup';
}
my $c = $r->connection();
my %Answers;
my ($resource,$partid,$respid) = ($problem->{'resource'},
$problem->{'part'},
$problem->{'respid'});
# Read in the cache (if it exists) before we start timing things.
&Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
# Open progress window
my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
($r,'Student Answer Compilation Status',
'Student Answer Compilation Progress', scalar(@$Students),
$status_type,undef,$formname,$inputname);
$r->rflush();
foreach my $student (@$Students) {
last if ($c->aborted());
my $sname = $student->{'username'};
my $sdom = $student->{'domain'};
my $answer = &Apache::lonstathelpers::analyze_problem_as_student
($resource,$sname,$sdom,$partid,$respid);
&Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
&mt('last student'));
$student->{'answer'} = $answer;
}
&Apache::lonstathelpers::write_answer_cache();
return if ($c->aborted());
$r->rflush();
# close progress window
&Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
return;
}
#####################################################
#####################################################
=pod
=item analyze_problem_as_student
Analyzes a homework problem for a student and returns the correct answer
for the student. Attempts to put together an answer for problem types
that do not natively support it.
Inputs: $resource: a resource object
$sname, $sdom, $partid, $respid
Returns: $answer
If $partid and $respid are specified, $answer is simply a scalar containing
the correct answer for the response.
If $partid or $respid are undefined, $answer will be a hash reference with
keys $partid.'.'.$respid.'.answer'.
=cut
#####################################################
#####################################################
sub analyze_problem_as_student {
my ($resource,$sname,$sdom,$partid,$respid) = @_;
my $returnvalue;
my $url = $resource->{'src'};
my $symb = $resource->{'symb'};
my $answer = &get_from_answer_cache($sname,$sdom,$symb,$partid,$respid);
if (defined($answer)) {
return($answer);
}
my $courseid = $ENV{'request.course.id'};
my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
'grade_domain' => $sdom,
'grade_username' => $sname,
'grade_symb' => $symb,
'grade_courseid' => $courseid));
(my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
my %Answer=&Apache::lonnet::str2hash($Answ);
#
undef($answer);
foreach my $partid (@{$resource->{'parts'}}) {
my $partdata = $resource->{'partdata'}->{$partid};
foreach my $respid (@{$partdata->{'ResponseIds'}}) {
my $prefix = $partid.'.'.$respid;
my $key = $prefix.'.answer';
$answer->{$partid}->{$respid} = &get_answer($prefix,$key,%Answer);
}
}
&store_answer($sname,$sdom,$symb,undef,undef,$answer);
if (! defined($partid)) {
$returnvalue = $answer;
} elsif (! defined($respid)) {
$returnvalue = $answer->{$partid};
} else {
$returnvalue = $answer->{$partid}->{$respid};
}
return $returnvalue;
}
sub get_answer {
my ($prefix,$key,%Answer) = @_;
my $returnvalue;
if (exists($Answer{$key})) {
my $student_answer = $Answer{$key}->[0];
if (! defined($student_answer)) {
$student_answer = $Answer{$key}->[1];
}
$returnvalue = $student_answer;
} else {
if (exists($Answer{$prefix.'.shown'})) {
# The response has foils
my %values;
while (my ($k,$v) = each(%Answer)) {
next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
my $foilname = $2;
$values{$foilname}=$v;
}
foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
if (ref($values{$foil}) eq 'ARRAY') {
$returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
} else {
$returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
&HTML::Entities::encode($values{$foil},'<>&"').'&';
}
}
$returnvalue =~ s/ /\%20/g;
chop ($returnvalue);
}
}
return $returnvalue;
}
#####################################################
#####################################################
=pod
=item Caching routines
=over 4
=item &load_answer_cache($symb)
Loads the cache for the given symb into memory from disk.
Requires the cache filename be set.
Only should be called by &ensure_proper_cache.
=cut
#####################################################
#####################################################
{
my $cache_filename = undef;
my $current_symb = undef;
my %cache;
sub load_answer_cache {
my ($symb) = @_;
return if (! defined($cache_filename));
if (! defined($current_symb) || $current_symb ne $symb) {
undef(%cache);
my $storedstring;
my %cache_db;
if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
$storedstring = $cache_db{&Apache::lonnet::escape($symb)};
untie(%cache_db);
}
if (defined($storedstring)) {
%cache = %{thaw($storedstring)};
}
}
return;
}
#####################################################
#####################################################
=pod
=item &get_from_answer_cache($sname,$sdom,$symb,$partid,$respid)
Returns the appropriate data from the cache, or undef if no data exists.
If $respid is undefined, a hash ref containing the answers for the given
$partid is returned. If $partid is undefined, a hash ref containing answers
for all of the parts is returned.
=cut
#####################################################
#####################################################
sub get_from_answer_cache {
my ($sname,$sdom,$symb,$partid,$respid) = @_;
&ensure_proper_cache($symb);
my $returnvalue;
if (exists($cache{$sname.':'.$sdom}) &&
ref($cache{$sname.':'.$sdom}) eq 'HASH') {
if (defined($partid) &&
exists($cache{$sname.':'.$sdom}->{$partid})) {
if (defined($respid) &&
exists($cache{$sname.':'.$sdom}->{$partid}->{$respid})) {
$returnvalue = $cache{$sname.':'.$sdom}->{$partid}->{$respid};
} else {
$returnvalue = $cache{$sname.':'.$sdom}->{$partid};
}
} else {
$returnvalue = $cache{$sname.':'.$sdom};
}
} else {
$returnvalue = undef;
}
return $returnvalue;
}
#####################################################
#####################################################
=pod
=item &write_answer_cache($symb)
Writes the in memory cache to disk so that it can be read in with
&load_answer_cache($symb).
=cut
#####################################################
#####################################################
sub write_answer_cache {
return if (! defined($current_symb) || ! defined($cache_filename));
my %cache_db;
my $key = &Apache::lonnet::escape($current_symb);
if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
my $storestring = freeze(\%cache);
$cache_db{$key}=$storestring;
$cache_db{$key.'.time'}=time;
untie(%cache_db);
}
undef(%cache);
undef($current_symb);
undef($cache_filename);
return;
}
#####################################################
#####################################################
=pod
=item &ensure_proper_cache($symb)
Called to make sure we have the proper cache set up. This is called
prior to every answer lookup.
=cut
#####################################################
#####################################################
sub ensure_proper_cache {
my ($symb) = @_;
my $cid = $ENV{'request.course.id'};
my $new_filename = '/home/httpd/perl/tmp/'.
'problemanalsysis_'.$cid.'answer_cache.db';
if (! defined($cache_filename) ||
$cache_filename ne $new_filename ||
! defined($current_symb) ||
$current_symb ne $symb) {
$cache_filename = $new_filename;
# Notice: $current_symb is not set to $symb until after the cache is
# loaded. This is what tells &load_answer_cache to load in a new
# symb cache.
&load_answer_cache($symb);
$current_symb = $symb;
}
}
#####################################################
#####################################################
=pod
=item &store_answer($sname,$sdom,$symb,$partid,$respid,$dataset)
Stores the answer data in the in memory cache.
=cut
#####################################################
#####################################################
sub store_answer {
my ($sname,$sdom,$symb,$partid,$respid,$dataset) = @_;
return if ($symb ne $current_symb);
if (defined($partid)) {
if (defined($respid)) {
$cache{$sname.':'.$sdom}->{$partid}->{$respid} = $dataset;
} else {
$cache{$sname.':'.$sdom}->{$partid} = $dataset;
}
} else {
$cache{$sname.':'.$sdom}=$dataset;
}
return;
}
}
#####################################################
#####################################################
=pod
=back
=cut
#####################################################
#####################################################
##
## The following is copied from datecalc1.pl, part of the
## Spreadsheet::WriteExcel CPAN module.
##
##
######################################################################
#
# Demonstration of writing date/time cells to Excel spreadsheets,
# using UNIX/Perl time as source of date/time.
#
# Copyright 2000, Andrew Benham, adsb@bigfoot.com
#
######################################################################
#
# UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
# measured in seconds.
#
# An Excel file can use exactly one of two different date/time systems.
# In these systems, a floating point number represents the number of days
# (and fractional parts of the day) since a start point. The floating point
# number is referred to as a 'serial'.
# The two systems ('1900' and '1904') use different starting points:
# '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
# a leap year - see:
# http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
# for the excuse^H^H^H^H^H^Hreason.
# '1904'; '1.00' is 2 Jan 1904.
#
# The '1904' system is the default for Apple Macs. Windows versions of
# Excel have the option to use the '1904' system.
#
# Note that Visual Basic's "DateSerial" function does NOT erroneously
# regard 1900 as a leap year, and thus its serials do not agree with
# the 1900 serials of Excel for dates before 1 Mar 1900.
#
# Note that StarOffice (at least at version 5.2) does NOT erroneously
# regard 1900 as a leap year, and thus its serials do not agree with
# the 1900 serials of Excel for dates before 1 Mar 1900.
#
######################################################################
#
# Calculation description
# =======================
#
# 1900 system
# -----------
# Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
# Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
# were leap years with an extra day.
# Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
# 1 Jan 1970.
# In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
# 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
#
# 1904 system
# -----------
# Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
# Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
# were leap years with an extra day.
# Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
# 1 Jan 1970.
# In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
#
######################################################################
#
# Copyright (c) 2000, Andrew Benham.
# This program is free software. It may be used, redistributed and/or
# modified under the same terms as Perl itself.
#
# Andrew Benham, adsb@bigfoot.com
# London, United Kingdom
# 11 Nov 2000
#
######################################################################
#-----------------------------------------------------------
# calc_serial()
#
# Called with (up to) 2 parameters.
# 1. Unix timestamp. If omitted, uses current time.
# 2. GMT flag. Set to '1' to return serial in GMT.
# If omitted, returns serial in appropriate timezone.
#
# Returns date/time serial according to $DATE_SYSTEM selected
#-----------------------------------------------------------
sub calc_serial {
# Use 1900 date system on all platforms other than Apple Mac (for which
# use 1904 date system).
my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
my $time = (defined $_[0]) ? $_[0] : time();
my $gmtflag = (defined $_[1]) ? $_[1] : 0;
#
# Divide timestamp by number of seconds in a day.
# This gives a date serial with '0' on 1 Jan 1970.
my $serial = $time / 86400;
#
# Adjust the date serial by the offset appropriate to the
# currently selected system (1900/1904).
if ($DATE_SYSTEM == 0) { # use 1900 system
$serial += 25569;
} else { # use 1904 system
$serial += 24107;
}
#
unless ($gmtflag) {
# Now have a 'raw' serial with the right offset. But this
# gives a serial in GMT, which is false unless the timezone
# is GMT. We need to adjust the serial by the appropriate
# timezone offset.
# Calculate the appropriate timezone offset by seeing what
# the differences between localtime and gmtime for the given
# time are.
#
my @gmtime = gmtime($time);
my @ltime = localtime($time);
#
# For the first 7 elements of the two arrays, adjust the
# date serial where the elements differ.
for (0 .. 6) {
my $diff = $ltime[$_] - $gmtime[$_];
if ($diff) {
$serial += _adjustment($diff,$_);
}
}
}
#
# Perpetuate the error that 1900 was a leap year by decrementing
# the serial if we're using the 1900 system and the date is prior to
# 1 Mar 1900. This has the effect of making serial value '60'
# 29 Feb 1900.
#
# This fix only has any effect if UNIX/Perl time on the platform
# can represent 1900. Many can't.
#
unless ($DATE_SYSTEM) {
$serial-- if ($serial < 61); # '61' is 1 Mar 1900
}
return $serial;
}
sub _adjustment {
# Based on the difference in the localtime/gmtime array elements
# number, return the adjustment required to the serial.
#
# We only look at some elements of the localtime/gmtime arrays:
# seconds unlikely to be different as all known timezones
# have an offset of integral multiples of 15 minutes,
# but it's easy to do.
# minutes will be different for timezone offsets which are
# not an exact number of hours.
# hours very likely to be different.
# weekday will differ when localtime/gmtime difference
# straddles midnight.
#
# Assume that difference between localtime and gmtime is less than
# 5 days, then don't have to do maths for day of month, month number,
# year number, etc...
#
my ($delta,$element) = @_;
my $adjust = 0;
#
if ($element == 0) { # Seconds
$adjust = $delta/86400; # 60 * 60 * 24
} elsif ($element == 1) { # Minutes
$adjust = $delta/1440; # 60 * 24
} elsif ($element == 2) { # Hours
$adjust = $delta/24; # 24
} elsif ($element == 6) { # Day of week number
# Catch difference straddling Sat/Sun in either direction
$delta += 7 if ($delta < -4);
$delta -= 7 if ($delta > 4);
#
$adjust = $delta;
}
return $adjust;
}
###########################################################
###########################################################
=pod
=item get_problem_data
Returns a data structure describing the problem.
Inputs: $url
Returns: %Partdata
=cut
## note: we must force each foil and option to not begin or end with
## spaces as they are stored without such data.
##
###########################################################
###########################################################
sub get_problem_data {
my ($url) = @_;
my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
(my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
my %Answer;
%Answer=&Apache::lonnet::str2hash($Answ);
my %Partdata;
foreach my $part (@{$Answer{'parts'}}) {
while (my($key,$value) = each(%Answer)) {
#
# Logging code:
if (0) {
&Apache::lonnet::logthis($part.' got key "'.$key.'"');
if (ref($value) eq 'ARRAY') {
&Apache::lonnet::logthis(' @'.join(',',@$value));
} else {
&Apache::lonnet::logthis(' '.$value);
}
}
# End of logging code
next if ($key !~ /^$part/);
$key =~ s/^$part\.//;
if (ref($value) eq 'ARRAY') {
if ($key eq 'options') {
$Partdata{$part}->{'_Options'}=$value;
} elsif ($key eq 'concepts') {
$Partdata{$part}->{'_Concepts'}=$value;
} elsif ($key =~ /^concept\.(.*)$/) {
my $concept = $1;
foreach my $foil (@$value) {
$Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
$concept;
}
} elsif ($key =~ /^(incorrect|answer|ans_low|ans_high)$/) {
$Partdata{$part}->{$key}=$value;
}
} else {
if ($key=~ /^foil\.text\.(.*)$/) {
my $foil = $1;
$Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
$value =~ s/(\s*$|^\s*)//g;
$Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
} elsif ($key =~ /^foil\.value\.(.*)$/) {
my $foil = $1;
$Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
}
}
}
}
return %Partdata;
}
####################################################
####################################################
=pod
=item &limit_by_time()
=cut
####################################################
####################################################
sub limit_by_time_form {
my $Starttime_form = '';
my $starttime = &Apache::lonhtmlcommon::get_date_from_form
('limitby_startdate');
my $endtime = &Apache::lonhtmlcommon::get_date_from_form
('limitby_enddate');
if (! defined($endtime)) {
$endtime = time;
}
if (! defined($starttime)) {
$starttime = $endtime - 60*60*24*7;
}
my $state;
if (&limit_by_time()) {
$state = '';
} else {
$state = 'disabled';
}
my $startdateform = &Apache::lonhtmlcommon::date_setter
('Statistics','limitby_startdate',$starttime,undef,undef,$state);
my $enddateform = &Apache::lonhtmlcommon::date_setter
('Statistics','limitby_enddate',$endtime,undef,undef,$state);
my $Str;
$Str .= '<script language="Javascript" >';
$Str .= 'function toggle_limitby_activity(state) {';
$Str .= ' if (state) {';
$Str .= ' limitby_startdate_enable();';
$Str .= ' limitby_enddate_enable();';
$Str .= ' } else {';
$Str .= ' limitby_startdate_disable();';
$Str .= ' limitby_enddate_disable();';
$Str .= ' }';
$Str .= '}';
$Str .= '</script>';
$Str .= '<fieldset>';
my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
if (&limit_by_time()) {
$timecheckbox .= ' checked ';
}
$timecheckbox .= 'OnChange="javascript:toggle_limitby_activity(this.checked);" ';
$timecheckbox .= ' />';
$Str .= '<legend>'.&mt('[_1] Limit by time',$timecheckbox).'</legend>';
$Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
$Str .= &mt(' End Time: [_1]',$enddateform).'<br />';
$Str .= '</fieldset>';
return $Str;
}
sub limit_by_time {
if (exists($ENV{'form.limit_by_time'}) &&
$ENV{'form.limit_by_time'} ne '' ) {
return 1;
} else {
return 0;
}
}
sub get_time_limits {
my $starttime = &Apache::lonhtmlcommon::get_date_from_form
('limitby_startdate');
my $endtime = &Apache::lonhtmlcommon::get_date_from_form
('limitby_enddate');
return ($starttime,$endtime);
}
####################################################
####################################################
=pod
=item sections_description
Inputs: @Sections, an array of sections
Returns: A text description of the sections selected.
=cut
####################################################
####################################################
sub sections_description {
my @Sections = @_;
my $sectionstring = '';
if (scalar(@Sections) > 1) {
if (scalar(@Sections) > 2) {
my $last = pop(@Sections);
$sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
} else {
$sectionstring = "Sections ".join(' and ',@Sections);
}
} else {
if ($Sections[0] eq 'all') {
$sectionstring = "All sections";
} else {
$sectionstring = "Section ".$Sections[0];
}
}
return $sectionstring;
}
####################################################
####################################################
=pod
=item &manage_caches
Inputs: $r, apache request object
Returns: An array of scalars containing html for buttons.
=cut
####################################################
####################################################
sub manage_caches {
my ($r,$formname,$inputname) = @_;
&Apache::loncoursedata::clear_internal_caches();
my $sectionkey =
join(',',
map {
&Apache::lonnet::escape($_);
} sort(@Apache::lonstatistics::SelectedSections)
);
my $statuskey = $Apache::lonstatistics::enrollment_status;
if (exists($ENV{'form.ClearCache'}) ||
exists($ENV{'form.updatecaches'}) ||
(exists($ENV{'form.firstrun'}) && $ENV{'form.firstrun'} ne 'no') ||
(exists($ENV{'form.prevsection'}) &&
$ENV{'form.prevsection'} ne $sectionkey) ||
(exists($ENV{'form.prevenrollstatus'}) &&
$ENV{'form.prevenrollstatus'} ne $statuskey)
) {
&Apache::lonstatistics::Gather_Full_Student_Data($r,$formname,
$inputname);
}
#
my @Buttons =
('<input type="submit" name="ClearCache" '.
'value="'.&mt('Clear Caches').'" />',
'<input type="submit" name="updatecaches" '.
'value="'.&mt('Update Caches').'" />'.
&Apache::loncommon::help_open_topic('Statistics_Cache'),
'<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
'<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
);
#
if (! exists($ENV{'form.firstrun'})) {
$r->print('<input type="hidden" name="firstrun" value="yes" />');
} else {
$r->print('<input type="hidden" name="firstrun" value="no" />');
}
#
return @Buttons;
}
####################################################
####################################################
=pod
=back
=cut
####################################################
####################################################
1;
__END__
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