1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonstathelpers.pm,v 1.17 2004/06/25 21:02:41 matthew Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: ####################################################
28: ####################################################
29:
30: =pod
31:
32: =head1 NAME
33:
34: Apache::lonstathelpers - helper routines used by statistics
35:
36: =head1 SYNOPSIS
37:
38: This module provides a place to consolidate much of the statistics
39: routines that are needed across multiple statistics functions.
40:
41: =head1 OVERVIEW
42:
43:
44: =over 4
45:
46: =cut
47:
48: ####################################################
49: ####################################################
50: package Apache::lonstathelpers;
51:
52: use strict;
53: use Apache::lonnet();
54: use Apache::loncommon();
55: use Apache::lonhtmlcommon();
56: use Apache::loncoursedata();
57: use Apache::lonstatistics;
58: use Apache::lonlocal;
59: use HTML::Entities();
60: use Time::Local();
61: use Spreadsheet::WriteExcel();
62: use GDBM_File;
63: use Storable qw(freeze thaw);
64:
65: ####################################################
66: ####################################################
67:
68: =pod
69:
70: =item &render_resource($resource)
71:
72: Input: a resource generated from
73: &Apache::loncoursedata::get_sequence_assessment_data().
74:
75: Retunrs: a scalar containing html for a rendering of the problem
76: within a table.
77:
78: =cut
79:
80: ####################################################
81: ####################################################
82: sub render_resource {
83: my ($resource) = @_;
84: ##
85: ## Render the problem
86: my $base;
87: ($base,undef) = ($resource->{'src'} =~ m|(.*/)[^/]*$|);
88: $base = "http://".$ENV{'SERVER_NAME'}.$base;
89: my $rendered_problem =
90: &Apache::lonnet::ssi_body($resource->{'src'});
91: $rendered_problem =~ s/<\s*form\s*/<nop /g;
92: $rendered_problem =~ s|(<\s*/form\s*>)|<\/nop>|g;
93: return '<table bgcolor="ffffff"><tr><td>'.
94: '<base href="'.$base.'" />'.
95: $rendered_problem.
96: '</td></tr></table>';
97: }
98:
99: ####################################################
100: ####################################################
101:
102: =pod
103:
104: =item &ProblemSelector($AcceptedResponseTypes)
105:
106: Input: scalar containing regular expression which matches response
107: types to show. '.' will yield all, '(option|radiobutton)' will match
108: all option response and radiobutton problems.
109:
110: Returns: A string containing html for a table which lists the sequences
111: and their contents. A radiobutton is provided for each problem.
112: Skips 'survey' problems.
113:
114: =cut
115:
116: ####################################################
117: ####################################################
118: sub ProblemSelector {
119: my ($AcceptedResponseTypes) = @_;
120: my $Str;
121: $Str = "\n<table>\n";
122: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess('all')) {
123: next if ($seq->{'num_assess'}<1);
124: my $seq_str = '';
125: foreach my $res (@{$seq->{'contents'}}) {
126: next if ($res->{'type'} ne 'assessment');
127: foreach my $part (@{$res->{'parts'}}) {
128: my $partdata = $res->{'partdata'}->{$part};
129: next if ($partdata->{'Survey'});
130: for (my $i=0;$i<scalar(@{$partdata->{'ResponseTypes'}});$i++){
131: my $respid = $partdata->{'ResponseIds'}->[$i];
132: my $resptype = $partdata->{'ResponseTypes'}->[$i];
133: if ($resptype =~ m/$AcceptedResponseTypes/) {
134: my $value = &make_target_id({symb=>$res->{'symb'},
135: part=>$part,
136: respid=>$respid,
137: resptype=>$resptype});
138: my $checked = '';
139: if ($ENV{'form.problemchoice'} eq $value) {
140: $checked = 'checked ';
141: }
142: my $title = $res->{'title'};
143: if (! defined($title) || $title eq '') {
144: ($title) = ($res->{'src'} =~ m:/([^/]*)$:);
145: }
146: $seq_str .= '<tr><td>'.
147: '<input type="radio" name="problemchoice" value="'.$value.'" '.$checked.'/>'.
148: '</td><td>'.
149: $resptype.'</td><td>'.
150: '<a href="'.$res->{'src'}.'">'.$title.'</a> ';
151: # '<a href="'.$res->{'src'}.'">'.$resptype.' '.$res->{'title'}.'</a> ';
152: if (scalar(@{$partdata->{'ResponseIds'}}) > 1) {
153: $seq_str .= &mt('response').' '.$respid;
154: }
155: $seq_str .= "</td></tr>\n";
156: }
157: }
158: }
159: }
160: if ($seq_str ne '') {
161: $Str .= '<tr><td> </td><td colspan="2"><b>'.$seq->{'title'}.'</b></td>'.
162: "</tr>\n".$seq_str;
163: }
164: }
165: $Str .= "</table>\n";
166: return $Str;
167: }
168:
169: ####################################################
170: ####################################################
171:
172: =pod
173:
174: =item &make_target_id($target)
175:
176: Inputs: Hash ref with the following entries:
177: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
178: $target->{'resptype'}.
179:
180: Returns: A string, suitable for a form parameter, which uniquely identifies
181: the problem, part, and response to do statistical analysis on.
182:
183: Used by Apache::lonstathelpers::ProblemSelector().
184:
185: =cut
186:
187: ####################################################
188: ####################################################
189: sub make_target_id {
190: my ($target) = @_;
191: my $id = &Apache::lonnet::escape($target->{'symb'}).':'.
192: &Apache::lonnet::escape($target->{'part'}).':'.
193: &Apache::lonnet::escape($target->{'respid'}).':'.
194: &Apache::lonnet::escape($target->{'resptype'});
195: return $id;
196: }
197:
198: ####################################################
199: ####################################################
200:
201: =pod
202:
203: =item &get_target_from_id($id)
204:
205: Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
206:
207: Returns: A hash reference, $target, containing the following keys:
208: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
209: $target->{'resptype'}.
210:
211: =cut
212:
213: ####################################################
214: ####################################################
215: sub get_target_from_id {
216: my ($id) = @_;
217: my ($symb,$part,$respid,$resptype) = split(':',$id);
218: return ({ symb =>&Apache::lonnet::unescape($symb),
219: part =>&Apache::lonnet::unescape($part),
220: respid =>&Apache::lonnet::unescape($respid),
221: resptype =>&Apache::lonnet::unescape($resptype)});
222: }
223:
224: ####################################################
225: ####################################################
226:
227: =pod
228:
229: =item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
230:
231: Determine the problem parts or responses preceeding and following the
232: current resource.
233:
234: Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
235: $AcceptableResponseTypes, regular expression matching acceptable
236: response types,
237: $granularity, either 'part', 'response', or 'part_survey'
238:
239: Returns: three hash references, $prev, $curr, $next, which refer to the
240: preceeding, current, or following problem parts or responses, depending
241: on the value of $granularity. Values of undef indicate there is no
242: previous or next part/response. A value of undef for all three indicates
243: there was no match found to the current part/resource.
244:
245: The hash references contain the following keys:
246: symb, part, resource
247:
248: If $granularity eq 'response', the following ADDITIONAL keys will be present:
249: respid, resptype
250:
251: =cut
252:
253: ####################################################
254: ####################################################
255: sub get_prev_curr_next {
256: my ($target,$AcceptableResponseTypes,$granularity) = @_;
257: #
258: # Build an array with the data we need to search through
259: my @Resource;
260: foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess('all')) {
261: foreach my $res (@{$seq->{'contents'}}) {
262: next if ($res->{'type'} ne 'assessment');
263: foreach my $part (@{$res->{'parts'}}) {
264: my $partdata = $res->{'partdata'}->{$part};
265: if ($partdata->{'Survey'}) {
266: if ($granularity eq 'part_survey'){
267: push (@Resource,
268: { symb => $res->{symb},
269: part => $part,
270: resource => $res,
271: } );
272: }
273: } elsif ($granularity eq 'part') {
274: push (@Resource,
275: { symb => $res->{symb},
276: part => $part,
277: resource => $res,
278: } );
279: } elsif ($granularity eq 'response') {
280: for (my $i=0;
281: $i<scalar(@{$partdata->{'ResponseTypes'}});
282: $i++){
283: my $respid = $partdata->{'ResponseIds'}->[$i];
284: my $resptype = $partdata->{'ResponseTypes'}->[$i];
285: next if ($resptype !~ m/$AcceptableResponseTypes/);
286: push (@Resource,
287: { symb => $res->{symb},
288: part => $part,
289: respid => $partdata->{'ResponseIds'}->[$i],
290: resource => $res,
291: resptype => $resptype
292: } );
293: }
294: }
295: }
296: }
297: }
298: #
299: # Get the index of the current situation
300: my $curr_idx;
301: for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
302: my $curr_item = $Resource[$curr_idx];
303: if ($granularity eq 'part' || $granularity eq 'part_survey') {
304: if ($curr_item->{'symb'} eq $target->{'symb'} &&
305: $curr_item->{'part'} eq $target->{'part'}) {
306: last;
307: }
308: } elsif ($granularity eq 'response') {
309: if ($curr_item->{'symb'} eq $target->{'symb'} &&
310: $curr_item->{'part'} eq $target->{'part'} &&
311: $curr_item->{'respid'} eq $target->{'respid'} &&
312: $curr_item->{'resptype'} eq $target->{'resptype'}) {
313: last;
314: }
315: }
316: }
317: my $curr_item = $Resource[$curr_idx];
318: if ($granularity eq 'part' || $granularity eq 'part_survey') {
319: if ($curr_item->{'symb'} ne $target->{'symb'} ||
320: $curr_item->{'part'} ne $target->{'part'}) {
321: # bogus symb - return nothing
322: return (undef,undef,undef);
323: }
324: } elsif ($granularity eq 'response') {
325: if ($curr_item->{'symb'} ne $target->{'symb'} ||
326: $curr_item->{'part'} ne $target->{'part'} ||
327: $curr_item->{'respid'} ne $target->{'respid'} ||
328: $curr_item->{'resptype'} ne $target->{'resptype'}){
329: # bogus symb - return nothing
330: return (undef,undef,undef);
331: }
332: }
333: #
334: # Now just pick up the data we need
335: my ($prev,$curr,$next);
336: if ($curr_idx == 0) {
337: $prev = undef;
338: $curr = $Resource[$curr_idx ];
339: $next = $Resource[$curr_idx+1];
340: } elsif ($curr_idx == $#Resource) {
341: $prev = $Resource[$curr_idx-1];
342: $curr = $Resource[$curr_idx ];
343: $next = undef;
344: } else {
345: $prev = $Resource[$curr_idx-1];
346: $curr = $Resource[$curr_idx ];
347: $next = $Resource[$curr_idx+1];
348: }
349: return ($prev,$curr,$next);
350: }
351:
352:
353: #####################################################
354: #####################################################
355:
356: =pod
357:
358: =item GetStudentAnswers($r,$problem,$Students)
359:
360: Determines the correct answer for a set of students on a given problem.
361: The students answers are stored in the student hashes pointed to by the
362: array @$Students under the key 'answer'.
363:
364: Inputs: $r
365: $problem: hash reference containing the keys 'resource', 'part', and 'respid'.
366: $Students: reference to array containing student hashes (need 'username',
367: 'domain').
368:
369: Returns: nothing
370:
371: =cut
372:
373: #####################################################
374: #####################################################
375: sub GetStudentAnswers {
376: my ($r,$problem,$Students,$formname,$inputname) = @_;
377: my $status_type;
378: if (defined($formname)) {
379: $status_type = 'inline';
380: } else {
381: $status_type = 'popup';
382: }
383: my $c = $r->connection();
384: my %Answers;
385: my ($resource,$partid,$respid) = ($problem->{'resource'},
386: $problem->{'part'},
387: $problem->{'respid'});
388: # Read in the cache (if it exists) before we start timing things.
389: &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
390: # Open progress window
391: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
392: ($r,'Student Answer Compilation Status',
393: 'Student Answer Compilation Progress', scalar(@$Students),
394: $status_type,undef,$formname,$inputname);
395: $r->rflush();
396: foreach my $student (@$Students) {
397: last if ($c->aborted());
398: my $sname = $student->{'username'};
399: my $sdom = $student->{'domain'};
400: my $answer = &Apache::lonstathelpers::analyze_problem_as_student
401: ($resource,$sname,$sdom,$partid,$respid);
402: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
403: &mt('last student'));
404: $student->{'answer'} = $answer;
405: }
406: &Apache::lonstathelpers::write_answer_cache();
407: return if ($c->aborted());
408: $r->rflush();
409: # close progress window
410: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
411: return;
412: }
413:
414: #####################################################
415: #####################################################
416:
417: =pod
418:
419: =item analyze_problem_as_student
420:
421: Analyzes a homework problem for a student and returns the correct answer
422: for the student. Attempts to put together an answer for problem types
423: that do not natively support it.
424:
425: Inputs: $resource: a resource object
426: $sname, $sdom, $partid, $respid
427:
428: Returns: $answer
429:
430: If $partid and $respid are specified, $answer is simply a scalar containing
431: the correct answer for the response.
432:
433: If $partid or $respid are undefined, $answer will be a hash reference with
434: keys $partid.'.'.$respid.'.answer'.
435:
436: =cut
437:
438: #####################################################
439: #####################################################
440: sub analyze_problem_as_student {
441: my ($resource,$sname,$sdom,$partid,$respid) = @_;
442: my $returnvalue;
443: my $url = $resource->{'src'};
444: my $symb = $resource->{'symb'};
445: my $answer = &get_from_answer_cache($sname,$sdom,$symb,$partid,$respid);
446: if (defined($answer)) {
447: return($answer);
448: }
449: my $courseid = $ENV{'request.course.id'};
450: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
451: 'grade_domain' => $sdom,
452: 'grade_username' => $sname,
453: 'grade_symb' => $symb,
454: 'grade_courseid' => $courseid));
455: (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
456: my %Answer=&Apache::lonnet::str2hash($Answ);
457: #
458: undef($answer);
459: foreach my $partid (@{$resource->{'parts'}}) {
460: my $partdata = $resource->{'partdata'}->{$partid};
461: foreach my $respid (@{$partdata->{'ResponseIds'}}) {
462: my $prefix = $partid.'.'.$respid;
463: my $key = $prefix.'.answer';
464: $answer->{$partid}->{$respid} = &get_answer($prefix,$key,%Answer);
465: }
466: }
467: &store_answer($sname,$sdom,$symb,undef,undef,$answer);
468: if (! defined($partid)) {
469: $returnvalue = $answer;
470: } elsif (! defined($respid)) {
471: $returnvalue = $answer->{$partid};
472: } else {
473: $returnvalue = $answer->{$partid}->{$respid};
474: }
475: return $returnvalue;
476: }
477:
478: sub get_answer {
479: my ($prefix,$key,%Answer) = @_;
480: my $returnvalue;
481: if (exists($Answer{$key})) {
482: my $student_answer = $Answer{$key}->[0];
483: if (! defined($student_answer)) {
484: $student_answer = $Answer{$key}->[1];
485: }
486: $returnvalue = $student_answer;
487: } else {
488: if (exists($Answer{$prefix.'.shown'})) {
489: # The response has foils
490: my %values;
491: while (my ($k,$v) = each(%Answer)) {
492: next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
493: my $foilname = $2;
494: $values{$foilname}=$v;
495: }
496: foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
497: if (ref($values{$foil}) eq 'ARRAY') {
498: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
499: join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
500: } else {
501: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
502: &HTML::Entities::encode($values{$foil},'<>&"').'&';
503: }
504: }
505: $returnvalue =~ s/ /\%20/g;
506: chop ($returnvalue);
507: }
508: }
509: return $returnvalue;
510: }
511:
512:
513: #####################################################
514: #####################################################
515:
516: =pod
517:
518: =item Caching routines
519:
520: =over 4
521:
522: =item &load_answer_cache($symb)
523:
524: Loads the cache for the given symb into memory from disk.
525: Requires the cache filename be set.
526: Only should be called by &ensure_proper_cache.
527:
528: =cut
529:
530: #####################################################
531: #####################################################
532: {
533: my $cache_filename = undef;
534: my $current_symb = undef;
535: my %cache;
536:
537: sub load_answer_cache {
538: my ($symb) = @_;
539: return if (! defined($cache_filename));
540: if (! defined($current_symb) || $current_symb ne $symb) {
541: undef(%cache);
542: my $storedstring;
543: my %cache_db;
544: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
545: $storedstring = $cache_db{&Apache::lonnet::escape($symb)};
546: untie(%cache_db);
547: }
548: if (defined($storedstring)) {
549: %cache = %{thaw($storedstring)};
550: }
551: }
552: return;
553: }
554:
555: #####################################################
556: #####################################################
557:
558: =pod
559:
560: =item &get_from_answer_cache($sname,$sdom,$symb,$partid,$respid)
561:
562: Returns the appropriate data from the cache, or undef if no data exists.
563: If $respid is undefined, a hash ref containing the answers for the given
564: $partid is returned. If $partid is undefined, a hash ref containing answers
565: for all of the parts is returned.
566:
567: =cut
568:
569: #####################################################
570: #####################################################
571: sub get_from_answer_cache {
572: my ($sname,$sdom,$symb,$partid,$respid) = @_;
573: &ensure_proper_cache($symb);
574: my $returnvalue;
575: if (exists($cache{$sname.':'.$sdom}) &&
576: ref($cache{$sname.':'.$sdom}) eq 'HASH') {
577: if (defined($partid) &&
578: exists($cache{$sname.':'.$sdom}->{$partid})) {
579: if (defined($respid) &&
580: exists($cache{$sname.':'.$sdom}->{$partid}->{$respid})) {
581: $returnvalue = $cache{$sname.':'.$sdom}->{$partid}->{$respid};
582: } else {
583: $returnvalue = $cache{$sname.':'.$sdom}->{$partid};
584: }
585: } else {
586: $returnvalue = $cache{$sname.':'.$sdom};
587: }
588: } else {
589: $returnvalue = undef;
590: }
591: return $returnvalue;
592: }
593:
594: #####################################################
595: #####################################################
596:
597: =pod
598:
599: =item &write_answer_cache($symb)
600:
601: Writes the in memory cache to disk so that it can be read in with
602: &load_answer_cache($symb).
603:
604: =cut
605:
606: #####################################################
607: #####################################################
608: sub write_answer_cache {
609: return if (! defined($current_symb) || ! defined($cache_filename));
610: my %cache_db;
611: my $key = &Apache::lonnet::escape($current_symb);
612: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
613: my $storestring = freeze(\%cache);
614: $cache_db{$key}=$storestring;
615: $cache_db{$key.'.time'}=time;
616: untie(%cache_db);
617: }
618: undef(%cache);
619: undef($current_symb);
620: undef($cache_filename);
621: return;
622: }
623:
624: #####################################################
625: #####################################################
626:
627: =pod
628:
629: =item &ensure_proper_cache($symb)
630:
631: Called to make sure we have the proper cache set up. This is called
632: prior to every answer lookup.
633:
634: =cut
635:
636: #####################################################
637: #####################################################
638: sub ensure_proper_cache {
639: my ($symb) = @_;
640: my $cid = $ENV{'request.course.id'};
641: my $new_filename = '/home/httpd/perl/tmp/'.
642: 'problemanalsysis_'.$cid.'answer_cache.db';
643: if (! defined($cache_filename) ||
644: $cache_filename ne $new_filename ||
645: ! defined($current_symb) ||
646: $current_symb ne $symb) {
647: $cache_filename = $new_filename;
648: # Notice: $current_symb is not set to $symb until after the cache is
649: # loaded. This is what tells &load_answer_cache to load in a new
650: # symb cache.
651: &load_answer_cache($symb);
652: $current_symb = $symb;
653: }
654: }
655:
656: #####################################################
657: #####################################################
658:
659: =pod
660:
661: =item &store_answer($sname,$sdom,$symb,$partid,$respid,$dataset)
662:
663: Stores the answer data in the in memory cache.
664:
665: =cut
666:
667: #####################################################
668: #####################################################
669: sub store_answer {
670: my ($sname,$sdom,$symb,$partid,$respid,$dataset) = @_;
671: return if ($symb ne $current_symb);
672: if (defined($partid)) {
673: if (defined($respid)) {
674: $cache{$sname.':'.$sdom}->{$partid}->{$respid} = $dataset;
675: } else {
676: $cache{$sname.':'.$sdom}->{$partid} = $dataset;
677: }
678: } else {
679: $cache{$sname.':'.$sdom}=$dataset;
680: }
681: return;
682: }
683:
684: }
685: #####################################################
686: #####################################################
687:
688: =pod
689:
690: =back
691:
692: =cut
693:
694: #####################################################
695: #####################################################
696:
697: ##
698: ## The following is copied from datecalc1.pl, part of the
699: ## Spreadsheet::WriteExcel CPAN module.
700: ##
701: ##
702: ######################################################################
703: #
704: # Demonstration of writing date/time cells to Excel spreadsheets,
705: # using UNIX/Perl time as source of date/time.
706: #
707: # Copyright 2000, Andrew Benham, adsb@bigfoot.com
708: #
709: ######################################################################
710: #
711: # UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
712: # measured in seconds.
713: #
714: # An Excel file can use exactly one of two different date/time systems.
715: # In these systems, a floating point number represents the number of days
716: # (and fractional parts of the day) since a start point. The floating point
717: # number is referred to as a 'serial'.
718: # The two systems ('1900' and '1904') use different starting points:
719: # '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
720: # a leap year - see:
721: # http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
722: # for the excuse^H^H^H^H^H^Hreason.
723: # '1904'; '1.00' is 2 Jan 1904.
724: #
725: # The '1904' system is the default for Apple Macs. Windows versions of
726: # Excel have the option to use the '1904' system.
727: #
728: # Note that Visual Basic's "DateSerial" function does NOT erroneously
729: # regard 1900 as a leap year, and thus its serials do not agree with
730: # the 1900 serials of Excel for dates before 1 Mar 1900.
731: #
732: # Note that StarOffice (at least at version 5.2) does NOT erroneously
733: # regard 1900 as a leap year, and thus its serials do not agree with
734: # the 1900 serials of Excel for dates before 1 Mar 1900.
735: #
736: ######################################################################
737: #
738: # Calculation description
739: # =======================
740: #
741: # 1900 system
742: # -----------
743: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
744: # Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
745: # were leap years with an extra day.
746: # Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
747: # 1 Jan 1970.
748: # In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
749: # 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
750: #
751: # 1904 system
752: # -----------
753: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
754: # Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
755: # were leap years with an extra day.
756: # Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
757: # 1 Jan 1970.
758: # In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
759: #
760: ######################################################################
761: #
762: # Copyright (c) 2000, Andrew Benham.
763: # This program is free software. It may be used, redistributed and/or
764: # modified under the same terms as Perl itself.
765: #
766: # Andrew Benham, adsb@bigfoot.com
767: # London, United Kingdom
768: # 11 Nov 2000
769: #
770: ######################################################################
771: #-----------------------------------------------------------
772: # calc_serial()
773: #
774: # Called with (up to) 2 parameters.
775: # 1. Unix timestamp. If omitted, uses current time.
776: # 2. GMT flag. Set to '1' to return serial in GMT.
777: # If omitted, returns serial in appropriate timezone.
778: #
779: # Returns date/time serial according to $DATE_SYSTEM selected
780: #-----------------------------------------------------------
781: sub calc_serial {
782: # Use 1900 date system on all platforms other than Apple Mac (for which
783: # use 1904 date system).
784: my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
785: my $time = (defined $_[0]) ? $_[0] : time();
786: my $gmtflag = (defined $_[1]) ? $_[1] : 0;
787: #
788: # Divide timestamp by number of seconds in a day.
789: # This gives a date serial with '0' on 1 Jan 1970.
790: my $serial = $time / 86400;
791: #
792: # Adjust the date serial by the offset appropriate to the
793: # currently selected system (1900/1904).
794: if ($DATE_SYSTEM == 0) { # use 1900 system
795: $serial += 25569;
796: } else { # use 1904 system
797: $serial += 24107;
798: }
799: #
800: unless ($gmtflag) {
801: # Now have a 'raw' serial with the right offset. But this
802: # gives a serial in GMT, which is false unless the timezone
803: # is GMT. We need to adjust the serial by the appropriate
804: # timezone offset.
805: # Calculate the appropriate timezone offset by seeing what
806: # the differences between localtime and gmtime for the given
807: # time are.
808: #
809: my @gmtime = gmtime($time);
810: my @ltime = localtime($time);
811: #
812: # For the first 7 elements of the two arrays, adjust the
813: # date serial where the elements differ.
814: for (0 .. 6) {
815: my $diff = $ltime[$_] - $gmtime[$_];
816: if ($diff) {
817: $serial += _adjustment($diff,$_);
818: }
819: }
820: }
821: #
822: # Perpetuate the error that 1900 was a leap year by decrementing
823: # the serial if we're using the 1900 system and the date is prior to
824: # 1 Mar 1900. This has the effect of making serial value '60'
825: # 29 Feb 1900.
826: #
827: # This fix only has any effect if UNIX/Perl time on the platform
828: # can represent 1900. Many can't.
829: #
830: unless ($DATE_SYSTEM) {
831: $serial-- if ($serial < 61); # '61' is 1 Mar 1900
832: }
833: return $serial;
834: }
835:
836: sub _adjustment {
837: # Based on the difference in the localtime/gmtime array elements
838: # number, return the adjustment required to the serial.
839: #
840: # We only look at some elements of the localtime/gmtime arrays:
841: # seconds unlikely to be different as all known timezones
842: # have an offset of integral multiples of 15 minutes,
843: # but it's easy to do.
844: # minutes will be different for timezone offsets which are
845: # not an exact number of hours.
846: # hours very likely to be different.
847: # weekday will differ when localtime/gmtime difference
848: # straddles midnight.
849: #
850: # Assume that difference between localtime and gmtime is less than
851: # 5 days, then don't have to do maths for day of month, month number,
852: # year number, etc...
853: #
854: my ($delta,$element) = @_;
855: my $adjust = 0;
856: #
857: if ($element == 0) { # Seconds
858: $adjust = $delta/86400; # 60 * 60 * 24
859: } elsif ($element == 1) { # Minutes
860: $adjust = $delta/1440; # 60 * 24
861: } elsif ($element == 2) { # Hours
862: $adjust = $delta/24; # 24
863: } elsif ($element == 6) { # Day of week number
864: # Catch difference straddling Sat/Sun in either direction
865: $delta += 7 if ($delta < -4);
866: $delta -= 7 if ($delta > 4);
867: #
868: $adjust = $delta;
869: }
870: return $adjust;
871: }
872:
873: ###########################################################
874: ###########################################################
875:
876: =pod
877:
878: =item get_problem_data
879:
880: Returns a data structure describing the problem.
881:
882: Inputs: $url
883:
884: Returns: %Partdata
885:
886: =cut
887:
888: ## note: we must force each foil and option to not begin or end with
889: ## spaces as they are stored without such data.
890: ##
891: ###########################################################
892: ###########################################################
893: sub get_problem_data {
894: my ($url) = @_;
895: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
896: (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
897: my %Answer;
898: %Answer=&Apache::lonnet::str2hash($Answ);
899: my %Partdata;
900: foreach my $part (@{$Answer{'parts'}}) {
901: while (my($key,$value) = each(%Answer)) {
902: #
903: # Logging code:
904: if (0) {
905: &Apache::lonnet::logthis($part.' got key "'.$key.'"');
906: if (ref($value) eq 'ARRAY') {
907: &Apache::lonnet::logthis(' @'.join(',',@$value));
908: } else {
909: &Apache::lonnet::logthis(' '.$value);
910: }
911: }
912: # End of logging code
913: next if ($key !~ /^$part/);
914: $key =~ s/^$part\.//;
915: if (ref($value) eq 'ARRAY') {
916: if ($key eq 'options') {
917: $Partdata{$part}->{'_Options'}=$value;
918: } elsif ($key eq 'concepts') {
919: $Partdata{$part}->{'_Concepts'}=$value;
920: } elsif ($key =~ /^concept\.(.*)$/) {
921: my $concept = $1;
922: foreach my $foil (@$value) {
923: $Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
924: $concept;
925: }
926: } elsif ($key =~ /^(incorrect|answer|ans_low|ans_high)$/) {
927: $Partdata{$part}->{$key}=$value;
928: }
929: } else {
930: if ($key=~ /^foil\.text\.(.*)$/) {
931: my $foil = $1;
932: $Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
933: $value =~ s/(\s*$|^\s*)//g;
934: $Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
935: } elsif ($key =~ /^foil\.value\.(.*)$/) {
936: my $foil = $1;
937: $Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
938: }
939: }
940: }
941: }
942: return %Partdata;
943: }
944:
945: ####################################################
946: ####################################################
947:
948: =pod
949:
950: =item &limit_by_time()
951:
952: =cut
953:
954: ####################################################
955: ####################################################
956: sub limit_by_time_form {
957: my $Starttime_form = '';
958: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
959: ('limitby_startdate');
960: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
961: ('limitby_enddate');
962: if (! defined($endtime)) {
963: $endtime = time;
964: }
965: if (! defined($starttime)) {
966: $starttime = $endtime - 60*60*24*7;
967: }
968: my $state;
969: if (&limit_by_time()) {
970: $state = '';
971: } else {
972: $state = 'disabled';
973: }
974: my $startdateform = &Apache::lonhtmlcommon::date_setter
975: ('Statistics','limitby_startdate',$starttime,undef,undef,$state);
976: my $enddateform = &Apache::lonhtmlcommon::date_setter
977: ('Statistics','limitby_enddate',$endtime,undef,undef,$state);
978: my $Str;
979: $Str .= '<script language="Javascript" >';
980: $Str .= 'function toggle_limitby_activity(state) {';
981: $Str .= ' if (state) {';
982: $Str .= ' limitby_startdate_enable();';
983: $Str .= ' limitby_enddate_enable();';
984: $Str .= ' } else {';
985: $Str .= ' limitby_startdate_disable();';
986: $Str .= ' limitby_enddate_disable();';
987: $Str .= ' }';
988: $Str .= '}';
989: $Str .= '</script>';
990: $Str .= '<fieldset>';
991: my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
992: if (&limit_by_time()) {
993: $timecheckbox .= ' checked ';
994: }
995: $timecheckbox .= 'OnChange="javascript:toggle_limitby_activity(this.checked);" ';
996: $timecheckbox .= ' />';
997: $Str .= '<legend>'.&mt('[_1] Limit by time',$timecheckbox).'</legend>';
998: $Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
999: $Str .= &mt(' End Time: [_1]',$enddateform).'<br />';
1000: $Str .= '</fieldset>';
1001: return $Str;
1002: }
1003:
1004: sub limit_by_time {
1005: if (exists($ENV{'form.limit_by_time'}) &&
1006: $ENV{'form.limit_by_time'} ne '' ) {
1007: return 1;
1008: } else {
1009: return 0;
1010: }
1011: }
1012:
1013: sub get_time_limits {
1014: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1015: ('limitby_startdate');
1016: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1017: ('limitby_enddate');
1018: return ($starttime,$endtime);
1019: }
1020:
1021:
1022:
1023: ####################################################
1024: ####################################################
1025:
1026: =pod
1027:
1028: =item sections_description
1029:
1030: Inputs: @Sections, an array of sections
1031:
1032: Returns: A text description of the sections selected.
1033:
1034: =cut
1035:
1036: ####################################################
1037: ####################################################
1038: sub sections_description {
1039: my @Sections = @_;
1040: my $sectionstring = '';
1041: if (scalar(@Sections) > 1) {
1042: if (scalar(@Sections) > 2) {
1043: my $last = pop(@Sections);
1044: $sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
1045: } else {
1046: $sectionstring = "Sections ".join(' and ',@Sections);
1047: }
1048: } else {
1049: if ($Sections[0] eq 'all') {
1050: $sectionstring = "All sections";
1051: } else {
1052: $sectionstring = "Section ".$Sections[0];
1053: }
1054: }
1055: return $sectionstring;
1056: }
1057:
1058: ####################################################
1059: ####################################################
1060:
1061: =pod
1062:
1063: =item &manage_caches
1064:
1065: Inputs: $r, apache request object
1066:
1067: Returns: An array of scalars containing html for buttons.
1068:
1069: =cut
1070:
1071: ####################################################
1072: ####################################################
1073: sub manage_caches {
1074: my ($r,$formname,$inputname) = @_;
1075: &Apache::loncoursedata::clear_internal_caches();
1076: my $sectionkey =
1077: join(',',
1078: map {
1079: &Apache::lonnet::escape($_);
1080: } sort(@Apache::lonstatistics::SelectedSections)
1081: );
1082: my $statuskey = $Apache::lonstatistics::enrollment_status;
1083: if (exists($ENV{'form.ClearCache'}) ||
1084: exists($ENV{'form.updatecaches'}) ||
1085: (exists($ENV{'form.firstrun'}) && $ENV{'form.firstrun'} ne 'no') ||
1086: (exists($ENV{'form.prevsection'}) &&
1087: $ENV{'form.prevsection'} ne $sectionkey) ||
1088: (exists($ENV{'form.prevenrollstatus'}) &&
1089: $ENV{'form.prevenrollstatus'} ne $statuskey)
1090: ) {
1091: &Apache::lonstatistics::Gather_Full_Student_Data($r,$formname,
1092: $inputname);
1093: }
1094: #
1095: my @Buttons =
1096: ('<input type="submit" name="ClearCache" '.
1097: 'value="'.&mt('Clear Caches').'" />',
1098: '<input type="submit" name="updatecaches" '.
1099: 'value="'.&mt('Update Caches').'" />'.
1100: &Apache::loncommon::help_open_topic('Statistics_Cache'),
1101: '<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
1102: '<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
1103: );
1104: #
1105: if (! exists($ENV{'form.firstrun'})) {
1106: $r->print('<input type="hidden" name="firstrun" value="yes" />');
1107: } else {
1108: $r->print('<input type="hidden" name="firstrun" value="no" />');
1109: }
1110: #
1111: return @Buttons;
1112: }
1113:
1114:
1115:
1116:
1117: ####################################################
1118: ####################################################
1119:
1120: =pod
1121:
1122: =back
1123:
1124: =cut
1125:
1126: ####################################################
1127: ####################################################
1128:
1129: 1;
1130:
1131: __END__
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