1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.362 2016/05/30 02:45:32 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27:
28:
29: package Apache::lonhomework;
30: use strict;
31: use Apache::style();
32: use Apache::lonxml();
33: use Apache::lonnet;
34: use Apache::lonplot();
35: use Apache::inputtags();
36: use Apache::structuretags();
37: use Apache::randomlabel();
38: use Apache::response();
39: use Apache::hint();
40: use Apache::outputtags();
41: use Apache::caparesponse();
42: use Apache::radiobuttonresponse();
43: use Apache::optionresponse();
44: use Apache::imageresponse();
45: use Apache::essayresponse();
46: use Apache::externalresponse();
47: use Apache::rankresponse();
48: use Apache::matchresponse();
49: use Apache::chemresponse();
50: use Apache::functionplotresponse();
51: use Apache::drawimage();
52: use Apache::loncapamath();
53: use Apache::Constants qw(:common);
54: use Apache::loncommon();
55: use Apache::lonparmset();
56: use Apache::lonlocal;
57: use Time::HiRes qw( gettimeofday tv_interval );
58: use HTML::Entities();
59: use File::Copy();
60:
61: # FIXME - improve commenting
62:
63:
64: BEGIN {
65: &Apache::lonxml::register_insert();
66: }
67:
68:
69: =pod
70:
71: =item set_bubble_lines()
72:
73: Called at analysis time to set the bubble lines
74: hash for the problem.. This should be called in the
75: end_problemtype tag in analysis mode.
76:
77: We fetch the hash of part id counters from lonxml
78: and push them into analyze:{part_id.bubble_lines}.
79:
80: =cut
81:
82: sub set_bubble_lines {
83: my %bubble_counters = &Apache::lonxml::get_bubble_line_hash();
84:
85: foreach my $key (keys(%bubble_counters)) {
86: $Apache::lonhomework::analyze{"$key.bubble_lines"} =
87: $bubble_counters{"$key"};
88: }
89: }
90:
91: #
92: # Decides what targets to render for.
93: # Implicit inputs:
94: # Various session environment variables:
95: # request.state - published - is a /res/ resource
96: # uploaded - is a /uploaded/ resource
97: # contruct - is a /priv/ resource
98: # form.grade_target - a form parameter requesting a specific target
99: sub get_target {
100: &Apache::lonxml::debug("request.state = $env{'request.state'}");
101: if( defined($env{'form.grade_target'})) {
102: &Apache::lonxml::debug("form.grade_target= $env{'form.grade_target'}");
103: } else {
104: &Apache::lonxml::debug("form.grade_target <undefined>");
105: }
106: if (($env{'request.state'} eq "published") ||
107: ($env{'request.state'} eq "uploaded")) {
108: if ( defined($env{'form.grade_target'} )
109: && ($env{'form.grade_target'} eq 'tex')) {
110: return ($env{'form.grade_target'});
111: } elsif ( defined($env{'form.grade_target'} )
112: && ($Apache::lonhomework::viewgrades eq 'F' )) {
113: return ($env{'form.grade_target'});
114: } elsif ( $env{'form.grade_target'} eq 'webgrade'
115: && ($Apache::lonhomework::queuegrade eq 'F' )) {
116: return ($env{'form.grade_target'});
117: } elsif ($env{'form.grade_target'} eq 'answer') {
118: if ($env{'form.answer_output_mode'} eq 'tex') {
119: return ($env{'form.grade_target'});
120: }
121: }
122: if ($env{'form.webgrade'} &&
123: ($Apache::lonhomework::modifygrades eq 'F'
124: || $Apache::lonhomework::queuegrade eq 'F' )) {
125: return ('grade','webgrade');
126: }
127: if ( defined($env{'form.submitted'}) &&
128: ( !defined($env{'form.newrandomization'}))) {
129: return ('grade', 'web');
130: } else {
131: return ('web');
132: }
133: } elsif ($env{'request.state'} eq "construct") {
134: #
135: # We are in construction space, editing and testing problems
136: #
137: if ( defined($env{'form.grade_target'}) ) {
138: return ($env{'form.grade_target'});
139: }
140: if ( defined($env{'form.preview'})) {
141: if ( defined($env{'form.submitted'})) {
142: #
143: # We are doing a problem preview
144: #
145: return ('grade', 'web');
146: } else {
147: return ('web');
148: }
149: } else {
150: if ($env{'form.problemstate'} eq 'WEB_GRADE') {
151: return ('grade','webgrade','answer');
152: } elsif ($env{'form.problemmode'} eq 'view') {
153: return ('grade','web','answer');
154: } elsif ($env{'form.problemmode'} eq 'saveview') {
155: return ('modified','web','answer');
156: } elsif ($env{'form.problemmode'} eq 'discard') {
157: return ('web','answer');
158: } elsif (($env{'form.problemmode'} eq 'saveedit') ||
159: ($env{'form.problemmode'} eq 'undo')) {
160: return ('modified','no_output_web','edit');
161: } elsif ($env{'form.problemmode'} eq 'edit') {
162: return ('no_output_web','edit');
163: } else {
164: return ('web');
165: }
166: }
167: #
168: # End of Authoring Space
169: #
170: }
171: #
172: # Huh? We are nowhere, so do nothing.
173: #
174: return ();
175: }
176:
177: sub setup_vars {
178: my ($target) = @_;
179: return ';'
180: # return ';$external::target='.$target.';';
181: }
182:
183: sub proctor_checked_in {
184: my ($slot_name,$slot,$type)=@_;
185: my @possible_proctors=split(",",$slot->{'proctor'});
186:
187: return 1 if (!@possible_proctors);
188:
189: my $key;
190: if ($type eq 'Task') {
191: my $version=$Apache::lonhomework::history{'resource.0.version'};
192: $key ="resource.$version.0.checkedin";
193: } elsif ($type eq 'problem') {
194: $key ='resource.0.checkedin';
195: }
196: # backward compatability, used to be username@domain,
197: # now is username:domain
198: my $who = $Apache::lonhomework::history{$key};
199: if ($who !~ /:/) {
200: $who =~ tr/@/:/;
201: }
202: foreach my $possible (@possible_proctors) {
203: if ($who eq $possible
204: && $Apache::lonhomework::history{$key.'.slot'} eq $slot_name) {
205: return 1;
206: }
207: }
208:
209: return 0;
210: }
211:
212: sub check_slot_access {
213: my ($id,$type,$symb)=@_;
214:
215: # does it pass normal muster
216: my ($status,$datemsg)=&check_access($id,$symb);
217:
218: my $useslots = &Apache::lonnet::EXT("resource.0.useslots",$symb);
219: if ($useslots ne 'resource' && $useslots ne 'map'
220: && $useslots ne 'map_map') {
221: return ($status,$datemsg);
222: }
223:
224: my $checkin = 'resource.0.checkedin';
225: my $version;
226: if ($type eq 'Task') {
227: $version=$Apache::lonhomework::history{'resource.version'};
228: $checkin = "resource.$version.0.checkedin";
229: }
230: my $checkedin = $Apache::lonhomework::history{$checkin};
231: my ($returned_slot,$slot_name,$checkinslot,$ipused,$blockip,$now,$ip);
232: $now = time;
233: $ip=$env{'request.host'} || $ENV{'REMOTE_ADDR'};
234:
235: if ($checkedin) {
236: $checkinslot = $Apache::lonhomework::history{"$checkin.slot"};
237: my %slot=&Apache::lonnet::get_slot($checkinslot);
238: if ($slot{'iptied'}) {
239: $ipused = $Apache::lonhomework::history{"$checkin.ip"};
240: unless (($ip ne '') && ($ipused eq $ip)) {
241: $blockip = $slot{'iptied'};
242: $slot_name = $checkinslot;
243: $returned_slot = \%slot;
244: }
245: }
246: }
247:
248: if ($status eq 'SHOW_ANSWER') {
249: if ($blockip eq 'answer') {
250: return ('NEED_DIFFERENT_IP','',$slot_name,$returned_slot,$ipused);
251: } else {
252: return ($status,$datemsg);
253: }
254: }
255:
256: if ($status eq 'CLOSED' ||
257: $status eq 'INVALID_ACCESS' ||
258: $status eq 'UNAVAILABLE') {
259: return ($status,$datemsg);
260: }
261: if ($env{'request.state'} eq "construct") {
262: return ($status,$datemsg);
263: }
264:
265: if ($type eq 'Task') {
266: if ($checkedin &&
267: $Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass') {
268: if ($blockip eq 'answer') {
269: return ('NEED_DIFFERENT_IP','',$slot_name,$returned_slot,$ipused);
270: } else {
271: return ('SHOW_ANSWER');
272: }
273: }
274: }
275:
276: my $availablestudent = &Apache::lonnet::EXT("resource.0.availablestudent",$symb);
277: my $available = &Apache::lonnet::EXT("resource.0.available",$symb);
278: my @slots= (split(':',$availablestudent),split(':',$available));
279:
280: # if (!@slots) {
281: # return ($status,$datemsg);
282: # }
283: undef($returned_slot);
284: undef($slot_name);
285: my $slotstatus='NOT_IN_A_SLOT';
286: my $num_usable_slots = 0;
287: if (!$symb) {
288: ($symb) = &Apache::lonnet::whichuser();
289: }
290: foreach my $slot (@slots) {
291: $slot =~ s/(^\s*|\s*$)//g;
292: &Apache::lonxml::debug("getting $slot");
293: my %slot=&Apache::lonnet::get_slot($slot);
294: &Apache::lonhomework::showhash(%slot);
295: next if ($slot{'endtime'} < $now);
296: $num_usable_slots ++;
297: if ($slot{'starttime'} < $now &&
298: $slot{'endtime'} > $now &&
299: &Apache::loncommon::check_ip_acc($slot{'ip'})) {
300: if ($slot{'iptied'}) {
301: if ($env{'request.course.id'}) {
302: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
303: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
304: if ($slot eq $checkinslot) {
305: if ($ip eq $ipused) {
306: &Apache::lonxml::debug("$slot is good");
307: $slotstatus ='NEEDS_CHECKIN';
308: } else {
309: $slotstatus = 'NEED_DIFFERENT_IP';
310: $slot_name = $slot;
311: $returned_slot = \%slot;
312: last;
313: }
314: } elsif ($ip) {
315: my $uniqkey = "$slot\0$symb\0$ip";
316: my %used_ip = &Apache::lonnet::get('slot_uniqueips',[$uniqkey],$cdom,$cnum);
317: if ($used_ip{$uniqkey}) {
318: $slotstatus = 'NEED_DIFFERENT_IP';
319: } else {
320: &Apache::lonxml::debug("$slot is good");
321: $slotstatus ='NEEDS_CHECKIN';
322: }
323: }
324: }
325: } else {
326: &Apache::lonxml::debug("$slot is good");
327: $slotstatus='NEEDS_CHECKIN';
328: }
329: if ($slotstatus eq 'NEEDS_CHECKIN') {
330: $returned_slot=\%slot;
331: $slot_name=$slot;
332: last;
333: }
334: }
335: }
336: if ($slotstatus eq 'NEEDS_CHECKIN' &&
337: &proctor_checked_in($slot_name,$returned_slot,$type)) {
338: &Apache::lonxml::debug("proctor checked in");
339: $slotstatus=$status;
340: }
341:
342: my ($is_correct,$got_grade);
343: if ($type eq 'Task') {
344: my $version=$Apache::lonhomework::history{'resource.0.version'};
345: $got_grade =
346: ($Apache::lonhomework::history{"resource.$version.0.status"}
347: =~ /^(?:pass|fail)$/);
348: $is_correct =
349: ($Apache::lonhomework::history{"resource.$version.0.status"} eq 'pass'
350: || $Apache::lonhomework::history{"resource.0.solved"} =~ /^correct_/ );
351: } elsif ($type eq 'problem') {
352: $got_grade = 1;
353: $is_correct =
354: ($Apache::lonhomework::history{"resource.0.solved"} =~/^correct_/);
355: }
356:
357: &Apache::lonxml::debug(" slot is $slotstatus checkedin ($checkedin) got_grade ($got_grade) is_correct ($is_correct)");
358:
359: # no slot is currently open, and has been checked in for this version
360: # but hasn't got a grade, therefore must be awaiting a grade
361: if (!defined($slot_name)
362: && $checkedin
363: && !$got_grade) {
364: return ('WAITING_FOR_GRADE');
365: }
366:
367: # Previously used slot is no longer open, and has been checked in for this version.
368: # However, the problem is not closed, and potentially, another slot might be
369: # used to gain access to it to work on it, until the due date is reached, and the
370: # problem then becomes CLOSED. Therefore return the slotstatus -
371: # (which will be one of: NOT_IN_A_SLOT, RESERVABLE, RESERVABLE_LATER, or NOTRESERVABLE).
372: if (!defined($slot_name) && $type eq 'problem') {
373: if ($slotstatus eq 'NOT_IN_A_SLOT') {
374: if (!$num_usable_slots) {
375: if ($env{'request.course.id'}) {
376: my $cdom = $env{'course.'.$env{'request.course.id'}.'.domain'};
377: my $cnum = $env{'course.'.$env{'request.course.id'}.'.num'};
378: unless ($symb) {
379: ($symb)=&Apache::lonnet::whichuser();
380: }
381: $slotstatus = 'NOTRESERVABLE';
382: my ($reservable_now_order,$reservable_now,$reservable_future_order,
383: $reservable_future) =
384: &Apache::loncommon::get_future_slots($cnum,$cdom,$now,$symb);
385: if ((ref($reservable_now_order) eq 'ARRAY') && (ref($reservable_now) eq 'HASH')) {
386: if (@{$reservable_now_order} > 0) {
387: $slotstatus = 'RESERVABLE';
388: $datemsg = $reservable_now->{$reservable_now_order->[-1]}{'endreserve'};
389: }
390: }
391: unless ($slotstatus eq 'RESERVABLE') {
392: if ((ref($reservable_future_order) eq 'ARRAY') && (ref($reservable_future) eq 'HASH')) {
393: if (@{$reservable_future_order} > 0) {
394: $slotstatus = 'RESERVABLE_LATER';
395: $datemsg = $reservable_future->{$reservable_future_order->[0]}{'startreserve'};
396: }
397: }
398: }
399: }
400: }
401: }
402: return ($slotstatus,$datemsg);
403: }
404:
405: if ($slotstatus eq 'NOT_IN_A_SLOT'
406: && $checkedin ) {
407:
408: if ($got_grade) {
409: if ($blockip eq 'answer') {
410: return ('NEED_DIFFERENT_IP','',$slot_name,$returned_slot,$ipused);
411: } else {
412: return ('SHOW_ANSWER');
413: }
414: } else {
415: return ('WAITING_FOR_GRADE');
416: }
417:
418: }
419:
420: if (($is_correct) && ($blockip ne 'answer')) {
421: if ($type eq 'problem') {
422: return ($status);
423: }
424: return ('SHOW_ANSWER');
425: }
426:
427: if ( $status eq 'CANNOT_ANSWER' &&
428: ($slotstatus ne 'NEEDS_CHECKIN' && $slotstatus ne 'NOT_IN_A_SLOT' &&
429: $slotstatus ne 'NEED_DIFFERENT_IP') ) {
430: return ($status,$datemsg);
431: }
432: return ($slotstatus,$datemsg,$slot_name,$returned_slot,$ipused);
433: }
434:
435: # JB, 9/24/2002: Any changes in this function may require a change
436: # in lonnavmaps::resource::getDateStatus.
437: sub check_access {
438: my ($id,$symb) = @_;
439: my $date ='';
440: my $status;
441: my $datemsg = '';
442: my $lastdate = '';
443: my $type;
444: my $passed;
445:
446: if ($env{'request.state'} eq "construct") {
447: if ($env{'form.problemstate'}) {
448: if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
449: if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct'
450: && &hide_problem_status())) {
451: return ('CANNOT_ANSWER',
452: &mt('is in this state due to author settings.'));
453: }
454: } else {
455: return ($env{'form.problemstate'},
456: &mt('is in this state due to author settings.'));
457: }
458: }
459: &Apache::lonxml::debug("in construction ignoring dates");
460: $status='CAN_ANSWER';
461: $datemsg=&mt('is in under construction');
462: # return ($status,$datemsg);
463: }
464:
465: &Apache::lonxml::debug("checking for part :$id:");
466: &Apache::lonxml::debug("time:".time);
467:
468: unless ($symb) {
469: ($symb)=&Apache::lonnet::whichuser();
470: }
471: &Apache::lonxml::debug("symb:".$symb);
472: #if ($env{'request.state'} ne "construct" && $symb ne '') {
473: if ($env{'request.state'} ne "construct") {
474: my $idacc = &Apache::lonnet::EXT("resource.$id.acc",$symb);
475: my $allowed=&Apache::loncommon::check_ip_acc($idacc);
476: if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
477: $status='INVALID_ACCESS';
478: $date=&mt("can not be accessed from your location.");
479: return($status,$date);
480: }
481: if ($env{'form.grade_imsexport'}) {
482: if (($env{'request.course.id'}) &&
483: (&Apache::lonnet::allowed('mdc',$env{'request.course.id'}))) {
484: return ('SHOW_ANSWER');
485: }
486: }
487: foreach my $temp ("opendate","duedate","answerdate") {
488: $lastdate = $date;
489: if ($temp eq 'duedate') {
490: $date = &due_date($id,$symb);
491: } else {
492: $date = &Apache::lonnet::EXT("resource.$id.$temp",$symb);
493: }
494:
495: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type",$symb);
496: if ($thistype =~ /^(con_lost|no_such_host)/ ||
497: $date =~ /^(con_lost|no_such_host)/) {
498: $status='UNAVAILABLE';
499: $date=&mt("may open later.");
500: return($status,$date);
501: }
502: if ($thistype eq 'date_interval') {
503: if ($temp eq 'opendate') {
504: $date=&Apache::lonnet::EXT("resource.$id.duedate",$symb)-$date;
505: }
506: if ($temp eq 'answerdate') {
507: $date=&Apache::lonnet::EXT("resource.$id.duedate",$symb)+$date;
508: }
509: }
510: &Apache::lonxml::debug("found :$date: for :$temp:");
511: if ($date eq '') {
512: $date = &mt("an unknown date"); $passed = 0;
513: } elsif ($date eq 'con_lost') {
514: $date = &mt("an indeterminate date"); $passed = 0;
515: } else {
516: if (time < $date) { $passed = 0; } else { $passed = 1; }
517: $date = &Apache::lonlocal::locallocaltime($date);
518: }
519: if (!$passed) { $type=$temp; last; }
520: }
521: &Apache::lonxml::debug("have :$type:$passed:");
522: if ($passed) {
523: $status='SHOW_ANSWER';
524: $datemsg=$date;
525: } elsif ($type eq 'opendate') {
526: $status='CLOSED';
527: $datemsg = &mt('will open on [_1]',$date);
528: } elsif ($type eq 'duedate') {
529: $status='CAN_ANSWER';
530: $datemsg = &mt('is due at [_1]',$date);
531: } elsif ($type eq 'answerdate') {
532: $status='CLOSED';
533: $datemsg = &mt('was due on [_1], and answers will be available on [_2]',
534: $lastdate,$date);
535: }
536: }
537: if ($status eq 'CAN_ANSWER' ||
538: (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED'))) {
539: #check #tries, and if correct.
540: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
541: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries",$symb);
542: if ( $tries eq '' ) { $tries = '0'; }
543: if ( $maxtries eq '' &&
544: $env{'request.state'} ne 'construct') { $maxtries = '2'; }
545: if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
546: # if (correct and show prob status) or excused then CANNOT_ANSWER
547: if ( ($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/)
548: && (&show_problem_status()) ) {
549: if (($Apache::lonhomework::history{"resource.$id.awarded"} >= 1) ||
550: (&Apache::lonnet::EXT("resource.$id.retrypartial",$symb) !~/^1|on|yes$/i)) {
551: $status = 'CANNOT_ANSWER';
552: }
553: } elsif ($Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
554: $status = 'CANNOT_ANSWER';
555: }
556: if ($status eq 'CANNOT_ANSWER'
557: && &show_answer_problem_status()) {
558: $status = 'SHOW_ANSWER';
559: }
560: }
561: if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
562: my @interval=&Apache::lonnet::EXT("resource.$id.interval",$symb);
563: &Apache::lonxml::debug("looking for interval @interval");
564: if ($interval[0]=~ /^\d+/) {
565: my $first_access=&Apache::lonnet::get_first_access($interval[1],$symb);
566: &Apache::lonxml::debug("looking for accesstime $first_access");
567: if (!$first_access) {
568: $status='NOT_YET_VIEWED';
569: my $due_date = &due_date($id,$symb);
570: my $seconds_left = $due_date - time;
571: my ($timelimit) = ($interval[0] =~ /^(\d+)/);
572: if ($seconds_left > $timelimit || $due_date eq '') {
573: $seconds_left = $timelimit;
574: }
575: $datemsg=&seconds_to_human_length($seconds_left);
576: }
577: }
578: }
579:
580: #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
581: # (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
582: # return ('UNCHECKEDOUT','needs to be checked out');
583: #}
584:
585: &Apache::lonxml::debug("sending back :$status:$datemsg:");
586: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
587: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
588: $status='CAN_ANSWER';
589: $datemsg=&mt('is closed but you are allowed to view it');
590: }
591:
592: return ($status,$datemsg);
593: }
594: # this should work exactly like the copy in lonnavmaps.pm
595: sub due_date {
596: my ($part_id,$symb,$udom,$uname)=@_;
597: my $date;
598: my @interval= &Apache::lonnet::EXT("resource.$part_id.interval",$symb,
599: $udom,$uname);
600: &Apache::lonxml::debug("looking for interval $part_id $symb @interval");
601: my $due_date= &Apache::lonnet::EXT("resource.$part_id.duedate",$symb,
602: $udom,$uname);
603: &Apache::lonxml::debug("looking for due_date $part_id $symb $due_date");
604: if ($interval[0] =~ /\d+/) {
605: my $first_access=&Apache::lonnet::get_first_access($interval[1],$symb);
606: &Apache::lonxml::debug("looking for first_access $first_access ($interval[1])");
607: if (defined($first_access)) {
608: my ($timelimit) = ($interval[0] =~ /^(\d+)/);
609: my $interval = $first_access+$timelimit;
610: $date = (!$due_date || $interval < $due_date) ? $interval
611: : $due_date;
612: } else {
613: $date = $due_date;
614: }
615: } else {
616: $date = $due_date;
617: }
618: return $date;
619: }
620:
621: sub seconds_to_human_length {
622: my ($length)=@_;
623:
624: my $seconds=$length%60; $length=int($length/60);
625: my $minutes=$length%60; $length=int($length/60);
626: my $hours=$length%24; $length=int($length/24);
627: my $days=$length;
628:
629: my $timestr;
630: if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
631: if ($hours > 0) { $timestr.=($timestr?", ":"").
632: &mt('[quant,_1,hour]',$hours); }
633: if ($minutes > 0) { $timestr.=($timestr?", ":"").
634: &mt('[quant,_1,minute]',$minutes); }
635: if ($seconds > 0) { $timestr.=($timestr?", ":"").
636: &mt('[quant,_1,second]',$seconds); }
637: return $timestr;
638: }
639:
640: sub showhash {
641: my (%hash) = @_;
642: &showhashsubset(\%hash,'.');
643: return '';
644: }
645:
646: sub showarray {
647: my ($array)=@_;
648: my $string="(";
649: foreach my $elm (@{ $array }) {
650: if (ref($elm) eq 'ARRAY') {
651: $string.=&showarray($elm);
652: } elsif (ref($elm) eq 'HASH') {
653: $string.= "HASH --- \n<br />";
654: $string.= &showhashsubset($elm,'.');
655: } else {
656: $string.="$elm,"
657: }
658: }
659: chop($string);
660: $string.=")";
661: return $string;
662: }
663:
664: sub showhashsubset {
665: my ($hash,$keyre) = @_;
666: my $resultkey;
667: foreach $resultkey (sort(keys(%$hash))) {
668: if ($resultkey !~ /$keyre/) { next; }
669: if (ref($$hash{$resultkey}) eq 'ARRAY' ) {
670: &Apache::lonxml::debug("$resultkey ---- ".
671: &showarray($$hash{$resultkey}));
672: } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
673: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
674: &showhashsubset($$hash{$resultkey},'.');
675: } else {
676: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
677: }
678: }
679: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
680: return '';
681: }
682:
683: sub setuppermissions {
684: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
685: unless ($Apache::lonhomework::browse eq 'F') {
686: $Apache::lonhomework::browse=&Apache::lonnet::allowed('bro',$env{'request.filename'});
687: }
688: my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
689: if (! $viewgrades &&
690: exists($env{'request.course.sec'}) &&
691: $env{'request.course.sec'} !~ /^\s*$/) {
692: $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
693: '/'.$env{'request.course.sec'});
694: }
695: $Apache::lonhomework::viewgrades = $viewgrades;
696:
697: if ($Apache::lonhomework::browse eq 'F' &&
698: $env{'form.devalidatecourseresdata'} eq 'on') {
699: my (undef,$courseid) = &Apache::lonnet::whichuser();
700: &Apache::lonnet::devalidatecourseresdata($env{"course.$courseid.num"},
701: $env{"course.$courseid.domain"});
702: }
703:
704: my $modifygrades = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
705: if (! $modifygrades &&
706: exists($env{'request.course.sec'}) &&
707: $env{'request.course.sec'} !~ /^\s*$/) {
708: $modifygrades =
709: &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
710: '/'.$env{'request.course.sec'});
711: }
712: $Apache::lonhomework::modifygrades = $modifygrades;
713:
714: my $queuegrade = &Apache::lonnet::allowed('mqg',$env{'request.course.id'});
715: if (! $queuegrade &&
716: exists($env{'request.course.sec'}) &&
717: $env{'request.course.sec'} !~ /^\s*$/) {
718: $queuegrade =
719: &Apache::lonnet::allowed('qgr',$env{'request.course.id'}.
720: '/'.$env{'request.course.sec'});
721: }
722: $Apache::lonhomework::queuegrade = $queuegrade;
723: return '';
724: }
725:
726: sub unset_permissions {
727: undef($Apache::lonhomework::queuegrade);
728: undef($Apache::lonhomework::modifygrades);
729: undef($Apache::lonhomework::viewgrades);
730: undef($Apache::lonhomework::browse);
731: }
732:
733: sub setupheader {
734: my $request=$_[0];
735: &Apache::loncommon::content_type($request,'text/html');
736: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
737: &Apache::loncommon::no_cache($request);
738: }
739: # $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
740: # 'lastrevisiondate'));
741: $request->send_http_header;
742: return OK if $request->header_only;
743: return ''
744: }
745:
746: sub handle_save_or_undo {
747: my ($request,$problem,$result,$getobjref) = @_;
748:
749: my $file = &Apache::lonnet::filelocation("",$request->uri);
750: my $filebak =$file.".bak";
751: my $filetmp =$file.".tmp";
752: my $error=0;
753: if (($env{'form.problemmode'} eq 'undo') || ($env{'form.problemmode'} eq 'undoxml')) {
754: my $error=0;
755: if (!&File::Copy::copy($file,$filetmp)) { $error=1; }
756: if ((!$error) && (!&File::Copy::copy($filebak,$file))) { $error=1; }
757: if ((!$error) && (!&File::Copy::move($filetmp,$filebak))) { $error=1; }
758: if (!$error) {
759: &Apache::lonxml::info("<p><b>".
760: &mt("Undid changes, Switched [_1] and [_2]",
761: '<span class="LC_filename">'.$filebak.
762: '</span>',
763: '<span class="LC_filename">'.$file.
764: '</span>')."</b></p>");
765: } else {
766: &Apache::lonxml::info("<p><span class=\"LC_error\">".
767: &mt("Unable to undo, unable to switch [_1] and [_2]",
768: '<span class="LC_filename">'.
769: $filebak.'</span>',
770: '<span class="LC_filename">'.
771: $file.'</span>')."</span></p>");
772: $error=1;
773: }
774: } else {
775: &Apache::lonnet::correct_line_ends($result);
776:
777: my $fs=Apache::File->new(">$filebak");
778: if (defined($fs)) {
779: print $fs $$problem;
780: } else {
781: &Apache::lonxml::info("<span class=\"LC_error\">".
782: &mt("Unable to make backup [_1]",
783: '<span class="LC_filename">'.
784: $filebak.'</span>')."</span>");
785: $error=2;
786: }
787: my $fh=Apache::File->new(">$file");
788: if (defined($fh)) {
789: print $fh $$result;
790: if (ref($getobjref) eq 'SCALAR') {
791: if ($file =~ m{([^/]+)\.(html?)$}) {
792: my $fname = $1;
793: my $ext = $2;
794: my $path = $file;
795: $path =~ s/\Q$fname\E\.\Q$ext\E$//;
796: my (%allfiles,%codebase);
797: &Apache::lonnet::extract_embedded_items($file,\%allfiles,
798: \%codebase,$result);
799: if (keys(%allfiles) > 0) {
800: my $url = $request->uri;
801: my $state = <<STATE;
802: <input type="hidden" name="action" value="upload_embedded" />
803: <input type="hidden" name="url" value="$url" />
804: STATE
805: $$getobjref = "<h3>".&mt("Reference Warning")."</h3>".
806: "<p>".&mt("Completed upload of the file. This file contained references to other files.")."</p>".
807: "<p>".&mt("Please select the locations from which the referenced files are to be uploaded.")."</p>".
808: &Apache::loncommon::ask_for_embedded_content($url,$state,\%allfiles,\%codebase,
809: {'error_on_invalid_names' => 1,
810: 'ignore_remote_references' => 1,});
811: }
812: }
813: }
814: } else {
815: &Apache::lonxml::info('<span class="LC_error">'.
816: &mt("Unable to write to [_1]",
817: '<span class="LC_filename">'.
818: $file.'</span>').
819: '</span>');
820: $error|=4;
821: }
822: }
823: return $error;
824: }
825:
826: sub analyze_header {
827: my ($request) = @_;
828: my $js = &Apache::structuretags::setmode_javascript();
829:
830: # Breadcrumbs
831: my $brcrum = [{'href' => &Apache::loncommon::authorspace($request->uri),
832: 'text' => 'Authoring Space'},
833: {'href' => '',
834: 'text' => 'Problem Testing'},
835: {'href' => '',
836: 'text' => 'Analyzing a problem'}];
837:
838: my $result =
839: &Apache::loncommon::start_page('Analyzing a problem',
840: $js,
841: {'bread_crumbs' => $brcrum,})
842: .&Apache::loncommon::head_subbox(
843: &Apache::loncommon::CSTR_pageheader());
844: $result .=
845: '<form name="lonhomework" method="post" action="'.
846: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
847: '<input type="hidden" name="problemmode" value="'.
848: $env{'form.problemmode'}.'" />'.
849: &Apache::structuretags::remember_problem_state().'
850: <div class="LC_edit_problem_analyze_header">
851: <input type="button" name="submitmode" value="'.&mt("EditXML").'" '.
852: 'onclick="javascript:setmode(this.form,'."'editxml'".')" />
853: <input type="button" name="submitmode" value="'.&mt('Edit').'" '.
854: 'onclick="javascript:setmode(this.form,'."'edit'".')" />
855: <hr />
856: <input type="button" name="submitmode" value="'.&mt("View").'" '.
857: 'onclick="javascript:setmode(this.form,'."'view'".')" />
858: <hr />
859: </div>'
860: .&Apache::lonxml::message_location().
861: '</form>';
862: &Apache::lonxml::add_messages(\$result);
863: $request->print($result);
864: $request->rflush();
865: }
866:
867: sub analyze_footer {
868: my ($request) = @_;
869: $request->print(&Apache::loncommon::end_page());
870: $request->rflush();
871: }
872:
873: sub analyze {
874: my ($request,$file) = @_;
875: &Apache::lonxml::debug("Analyze");
876: my $result;
877: my %overall;
878: my %seedexample;
879: my %allparts;
880: my $rndseed=$env{'form.rndseed'};
881: &analyze_header($request);
882: my %prog_state=
883: &Apache::lonhtmlcommon::Create_PrgWin($request,$env{'form.numtoanalyze'});
884: for(my $i=1;$i<$env{'form.numtoanalyze'}+1;$i++) {
885: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,'last problem');
886: if (&Apache::loncommon::connection_aborted($request)) { return; }
887: my $thisseed=$i+$rndseed;
888: my $subresult=&Apache::lonnet::ssi($request->uri,
889: ('grade_target' => 'analyze'),
890: ('rndseed' => $thisseed));
891: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
892: my %analyze=&Apache::lonnet::str2hash($subresult);
893: my @parts;
894: if (ref($analyze{'parts'}) eq 'ARRAY') {
895: @parts=@{ $analyze{'parts'} };
896: }
897: foreach my $part (@parts) {
898: if (!exists($allparts{$part})) {$allparts{$part}=1;};
899: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
900: $analyze{$part.'.type'} eq 'stringresponse' ||
901: $analyze{$part.'.type'} eq 'formularesponse' ) {
902: foreach my $name (keys(%{ $analyze{$part.'.answer'} })) {
903: my $i=0;
904: foreach my $answer_part (@{ $analyze{$part.'.answer'}{$name} }) {
905: push( @{ $overall{$part.'.answer'}[$i] },
906: $answer_part);
907: my $concatanswer= join("\0",@{ $answer_part });
908: if (($concatanswer eq '') || ($concatanswer=~/^\@/)) {
909: $answer_part = ['<span class="LC_error">'.&mt('Error').'</span>'];
910: }
911: $seedexample{join("\0",$part,$i,@{$answer_part})}=
912: $thisseed;
913: $i++;
914: }
915: }
916: if (!keys(%{ $analyze{$part.'.answer'} })) {
917: my $answer_part =
918: ['<span class="LC_error">'.&mt('Error').'</span>'];
919: $seedexample{join("\0",$part,0,@{$answer_part})}=
920: $thisseed;
921: push( @{ $overall{$part.'.answer'}[0] },
922: $answer_part);
923: }
924: }
925: }
926: }
927: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,&mt('Analyzing Results'));
928: $request->print('<hr />'
929: .'<h3>'
930: .&mt('List of possible answers')
931: .'</h3>'
932: );
933: foreach my $part (sort(keys(%allparts))) {
934: if ((ref($overall{$part.'.answer'}) eq 'ARRAY') &&
935: (@{$overall{$part.'.answer'}} > 0)) {
936: for (my $i=0;$i<scalar(@{ $overall{$part.'.answer'} });$i++) {
937: my $num_cols=scalar(@{ $overall{$part.'.answer'}[$i][0] });
938: $request->print(&Apache::loncommon::start_data_table()
939: .&Apache::loncommon::start_data_table_header_row()
940: .'<th colspan="'.($num_cols+1).'">'
941: .&mt('Part').' '.$part
942: );
943: if (scalar(@{ $overall{$part.'.answer'} }) > 1) {
944: $request->print(' '.&mt('Answer [_1]',$i+1));
945: }
946: $request->print('</th>'
947: .&Apache::loncommon::end_data_table_header_row()
948: );
949: my %frequency;
950: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'}[$i] })) {
951: $frequency{join("\0",@{ $answer })}++;
952: }
953: $request->print(&Apache::loncommon::start_data_table_header_row()
954: .'<th colspan="'.($num_cols).'">'.&mt('Answer').'</th>'
955: .'<th>'.&mt('Frequency').'<br />'
956: .'('.&mt('click for example').')</th>'
957: .&Apache::loncommon::end_data_table_header_row()
958: );
959: foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
960: $request->print(&Apache::loncommon::start_data_table_row()
961: .'<td>'
962: .join('</td><td>',split("\0",$answer))
963: .'</td>'
964: .'<td>'
965: .'<a href="'.$request->uri.'?rndseed='.$seedexample{join("\0",$part,$i,$answer)}.'">'.$frequency{$answer}.'</a>'
966: .'</td>'
967: .&Apache::loncommon::end_data_table_row()
968: );
969: }
970: $request->print(&Apache::loncommon::end_data_table());
971: }
972: } else {
973: $request->print('<p class="LC_warning">'
974: .&mt('Response [_1] is not analyzable at this time.',$part)
975: .'</p>'
976: );
977: }
978: }
979: if (scalar(keys(%allparts)) == 0 ) {
980: $request->print('<p class="LC_warning">'
981: .&mt('Found no analyzable responses in this problem.'
982: .' Currently only Numerical, Formula and String response styles are supported.')
983: .'</p>'
984: );
985: }
986: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
987: &analyze_footer($request);
988: &Apache::lonhomework::showhash(%overall);
989: return $result;
990: }
991:
992: {
993: my $show_problem_status;
994: sub reset_show_problem_status {
995: undef($show_problem_status);
996: }
997:
998: sub set_show_problem_status {
999: my ($new_status) = @_;
1000: $show_problem_status = lc($new_status);
1001: }
1002:
1003: sub hide_problem_status {
1004: return ($show_problem_status eq 'no'
1005: || $show_problem_status eq 'no_feedback_ever');
1006: }
1007:
1008: sub show_problem_status {
1009: return ($show_problem_status eq 'yes'
1010: || $show_problem_status eq 'answer'
1011: || $show_problem_status eq '');
1012: }
1013:
1014: sub show_some_problem_status {
1015: return ($show_problem_status eq 'no');
1016: }
1017:
1018: sub show_no_problem_status {
1019: return ($show_problem_status eq 'no_feedback_ever');
1020: }
1021:
1022: sub show_answer_problem_status {
1023: return ($show_problem_status eq 'answer');
1024: }
1025: }
1026:
1027: sub editxmlmode {
1028: my ($request,$file) = @_;
1029: my $result;
1030: my $problem=&Apache::lonnet::getfile($file);
1031: if ($problem eq -1) {
1032: &Apache::lonxml::error(
1033: '<p class="LC_error">'
1034: .&mt('Unable to find [_1]',
1035: '<span class="LC_filename">'.$file.'</span>')
1036: .'</p>');
1037:
1038: $problem='';
1039: }
1040: if (($env{'form.problemmode'} eq 'saveeditxml') ||
1041: ($env{'form.problemmode'} eq 'saveviewxml') ||
1042: ($env{'form.problemmode'} eq 'undoxml')) {
1043: my $error=&handle_save_or_undo($request,\$problem,
1044: \$env{'form.editxmltext'});
1045: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
1046: }
1047: &Apache::lonhomework::showhashsubset(\%env,'^form');
1048: if ($env{'form.problemmode'} eq 'saveviewxml') {
1049: &Apache::lonhomework::showhashsubset(\%env,'^form');
1050: $env{'form.problemmode'}='view';
1051: &renderpage($request,$file);
1052: } else {
1053: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
1054: if ($cols > 80) { $cols = 80; }
1055: if ($cols < 70) { $cols = 70; }
1056: if ($rows < 20) { $rows = 20; }
1057: my $js =
1058: &Apache::edit::js_change_detection().
1059: &Apache::loncommon::resize_textarea_js().
1060: &Apache::structuretags::setmode_javascript().
1061: &Apache::lonhtmlcommon::dragmath_js("EditMathPopup");
1062:
1063: # Breadcrumbs
1064: my $brcrum = [{'href' => &Apache::loncommon::authorspace($request->uri),
1065: 'text' => 'Authoring Space'},
1066: {'href' => '',
1067: 'text' => 'Problem Editing'}];
1068:
1069: my $start_page =
1070: &Apache::loncommon::start_page(&mt("EditXML [_1]",$file),$js,
1071: {'no_auto_mt_title' => 1,
1072: 'only_body' => 0,
1073: 'add_entries' => {
1074: 'onresize' => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
1075: 'onload' => q[resize_textarea('LC_editxmltext','LC_aftertextarea')],
1076: },
1077: 'bread_crumbs' => $brcrum,
1078: });
1079:
1080: $result=$start_page
1081: .&Apache::loncommon::head_subbox(
1082: &Apache::loncommon::CSTR_pageheader());
1083: $result.=&renderpage($request,$file,['no_output_web'],1).
1084: '<form '.&Apache::edit::form_change_detection().' name="lonhomework" method="post" action="'.
1085: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
1086: &Apache::structuretags::remember_problem_state().'
1087: <div class="LC_edit_problem_header">
1088: <div class="LC_edit_problem_header_title">'.
1089: &mt('Problem Editing').' '.&Apache::loncommon::help_open_topic('Problem_Editor_XML_Index').
1090: '</div><div class="LC_edit_actionbar" id="actionbar">';
1091:
1092: $result.='<input type="hidden" name="problemmode" value="saveedit" />'.
1093: &Apache::structuretags::problem_edit_buttons('editxml');
1094: $result.='<div>';
1095:
1096: $result .= '<ol class="LC_primary_menu" style="display:inline-block;font-size:90%;vertical-align:middle;">';
1097:
1098: unless ($env{'environment.nocodemirror'}) {
1099: # dropdown menus
1100: $result .= Apache::lonmenu::create_submenu("#", "",
1101: &mt("Problem Templates"), template_dropdown_datastructure());
1102:
1103: $result .= Apache::lonmenu::create_submenu("#", "",
1104: &mt("Response Types"), responseblock_dropdown_datastructure());
1105:
1106: $result .= Apache::lonmenu::create_submenu("#", "",
1107: &mt("Conditional Blocks"), conditional_scripting_datastructure());
1108:
1109: $result .= Apache::lonmenu::create_submenu("#", "",
1110: &mt("Miscellaneous"), misc_datastructure());
1111: }
1112:
1113: $result .= Apache::lonmenu::create_submenu("#", "",
1114: &mt("Help") . ' <img src="/adm/help/help.png" alt="' . &mt("Help") .
1115: '" style="vertical-align:text-bottom; height: auto; margin:0; "/>',
1116: helpmenu_datastructure(),"");
1117:
1118: $result.="</ol></div>";
1119:
1120: $result .= '</div></div>' .
1121: &Apache::lonxml::message_location() .
1122: &Apache::loncommon::xmleditor_js() .
1123: '<textarea ' . &Apache::edit::element_change_detection() .
1124: ' rows="'.$rows.'" cols="'.$cols.'" style="width:100%" ' .
1125: ' name="editxmltext" id="LC_editxmltext">' .
1126: &HTML::Entities::encode($problem,'<>&"') .
1127: '</textarea> <div id="LC_aftertextarea"> </div> </form>';
1128:
1129: my $resource = $env{'request.ambiguous'};
1130: unless($env{'environment.nocodemirror'}){
1131: $result .= '<link rel="stylesheet" href="/adm/codemirror/codemirror-combined-xml.css">
1132: <script src="/adm/codemirror/codemirror-compressed-xml.js"></script>
1133: <script>
1134: CodeMirror.defineMode("mixedmode", function(config) {
1135: return CodeMirror.multiplexingMode(
1136: CodeMirror.getMode(config, "xml"),
1137: {
1138: open: "\<script type=\"loncapa/perl\"\>", close: "\</script\>",
1139: mode: CodeMirror.getMode(config, "perl"),
1140: delimStyle: "tag",
1141: }
1142: );
1143: });
1144: var cm = CodeMirror.fromTextArea(document.getElementById("LC_editxmltext"),
1145: {
1146: mode: "mixedmode",
1147: lineWrapping: true,
1148: lineNumbers: true,
1149: tabSize: 4,
1150: indentUnit: 4,
1151:
1152: autoCloseTags: true,
1153: autoCloseBrackets: true,
1154: height: "auto",
1155: styleActiveLine: true,
1156:
1157: extraKeys: {
1158: "Tab": "indentMore",
1159: "Shift-Tab": "indentLess",
1160: }
1161: });
1162: restoreScrollPosition("'.$resource.'");
1163: </script>';
1164: }
1165:
1166: $result .= &Apache::loncommon::end_page();
1167: &Apache::lonxml::add_messages(\$result);
1168: $request->print($result);
1169: }
1170: return '';
1171: }
1172:
1173: #
1174: # Render the page in whatever target desired.
1175: #
1176: sub renderpage {
1177: my ($request,$file,$targets,$return_string,$donebuttonmsg) = @_;
1178:
1179: my @targets = @{$targets || [&get_target()]};
1180: &Apache::lonhomework::showhashsubset(\%env,'form.');
1181: &Apache::lonxml::debug("Running targets ".join(':',@targets));
1182:
1183: my $overall_result;
1184: foreach my $target (@targets) {
1185: # FIXME need to do something intelligent when a problem goes
1186: # from viewable to not viewable due to map conditions
1187: #&setuppermissions();
1188: #if ( $Apache::lonhomework::browse ne '2'
1189: # && $Apache::lonhomework::browse ne 'F' ) {
1190: # $request->print(" You most likely shouldn't see me.");
1191: #}
1192: #my $t0 = [&gettimeofday()];
1193: my $output=1;
1194: if ($target eq 'no_output_web') {
1195: $target = 'web'; $output=0;
1196: }
1197: my $problem=&Apache::lonnet::getfile($file);
1198: my $result;
1199: if ($problem eq -1) {
1200: $problem='';
1201: my $filename=(split('/',$file))[-1];
1202: my $error =
1203: '<p class="LC_error">'
1204: .&mt('Unable to find [_1]',
1205: '<span class="LC_filename">'.$filename.'</span>')
1206: ."</p>";
1207: $result.=
1208: &Apache::loncommon::simple_error_page($request,'Not available',
1209: $error,{'no_auto_mt_msg' => 1});
1210: return;
1211: }
1212:
1213: my %mystyle;
1214: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
1215: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
1216: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
1217:
1218: &Apache::lonxml::debug("Should be parsing now");
1219: $result .= &Apache::lonxml::xmlparse($request, $target, $problem,
1220: &setup_vars($target),%mystyle);
1221: &finished_parsing();
1222: if (!$output) { $result = ''; }
1223: #$request->print("Result follows:");
1224: if ($target eq 'modified') {
1225: &handle_save_or_undo($request,\$problem,\$result);
1226: } else {
1227: if ($target eq 'analyze') {
1228: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
1229: undef(%Apache::lonhomework::analyze);
1230: } elsif ($target eq 'web') {
1231: if ($donebuttonmsg) {
1232: $result =~ s{</body>}{};
1233: $result.= &Apache::loncommon::confirmwrapper(&Apache::lonhtmlcommon::confirm_success($donebuttonmsg,1))."\n</body>";
1234: }
1235: }
1236: #my $td=&tv_interval($t0);
1237: #if ( $Apache::lonxml::debug) {
1238: #$result =~ s:</body>::;
1239: #$result.="<br />Spent $td seconds processing target $target\n</body>";
1240: #}
1241: # $request->print($result);
1242: $overall_result.=$result;
1243: # $request->rflush();
1244: }
1245: #$request->print(":Result ends");
1246: #my $td=&tv_interval($t0);
1247: }
1248: if (!$return_string) {
1249: &Apache::lonxml::add_messages(\$overall_result);
1250: $request->print($overall_result);
1251: $request->rflush();
1252: } else {
1253: return $overall_result;
1254: }
1255: }
1256:
1257: sub finished_parsing {
1258: undef($Apache::lonhomework::parsing_a_problem);
1259: undef($Apache::lonhomework::parsing_a_task);
1260: }
1261:
1262: # function extracted from get_template_html
1263: # returns "key" -> list
1264: # key: path of template
1265: # value 1: title
1266: # value 2: category
1267: # value 3: name of help topic ???
1268: sub get_template_list{
1269: my ($extension) = @_;
1270:
1271: my @files = glob($Apache::lonnet::perlvar{'lonIncludes'}.
1272: '/templates/*.'.$extension);
1273: @files = map {[$_,&mt(&Apache::lonnet::metadata($_, 'title')),
1274: (&Apache::lonnet::metadata($_, 'category')?&mt(&Apache::lonnet::metadata($_, 'category')):&mt('Miscellaneous')),
1275: &mt(&Apache::lonnet::metadata($_, 'help'))]} (@files);
1276: @files = sort {$a->[2].$a->[1] cmp $b->[2].$b->[1]} (@files);
1277: return @files;
1278: }
1279:
1280: sub get_template_html {
1281: my ($extension) = @_;
1282: my $result;
1283: my @allnames;
1284: &Apache::lonxml::debug("Looking for :$extension:");
1285: my $glob_extension = $extension;
1286: if ($extension eq 'survey' || $extension eq 'exam') {
1287: $glob_extension = 'problem';
1288: }
1289: my @files = &get_template_list($extension);
1290: my ($midpoint,$seconddiv,$numfiles);
1291: my @noexamplelink = ('blank.problem','blank.library','script.library');
1292: $numfiles = 0;
1293: foreach my $file (@files) {
1294: next if ($file->[1] !~ /\S/);
1295: $numfiles ++;
1296: }
1297: if ($numfiles > 0) {
1298: $result = '<div class="LC_left_float">';
1299: $midpoint = int($numfiles/2);
1300: if ($numfiles%2) {
1301: $midpoint ++;
1302: }
1303: }
1304: my $count = 0;
1305: my $currentcategory='';
1306: my $first = 1;
1307: my $londocroot = $Apache::lonnet::perlvar{'lonDocRoot'};
1308: foreach my $file (@files) {
1309: next if ($file->[1] !~ /\S/);
1310: if ($file->[2] ne $currentcategory) {
1311: $currentcategory=$file->[2];
1312: if ((!$seconddiv) && ($count >= $midpoint)) {
1313: $result .= '</div></div>'."\n".'<div class="LC_left_float">'."\n";
1314: $seconddiv = 1;
1315: } elsif (!$first) {
1316: $result.='</div>'."\n";
1317: } else {
1318: $first = 0;
1319: }
1320: $result.= '<div class="LC_Box">'."\n"
1321: .'<h3 class="LC_hcell">'.$currentcategory.'</h3>'."\n";
1322: $count++;
1323: }
1324: $result .=
1325: '<label><input type="radio" name="template" value="'.$file->[0].'" />'.
1326: $file->[1].'</label>';
1327: if ($file->[3]) {
1328: $result.=&Apache::loncommon::help_open_topic($file->[3]);
1329: }
1330: # Provide example link
1331: my $filename=$file->[0];
1332: $filename=~s{^\Q$londocroot\E}{};
1333: if (!(grep($filename =~ /\Q$_\E$/,@noexamplelink))) {
1334: $result .= ' <span class="LC_fontsize_small">'
1335: .&Apache::loncommon::modal_link(
1336: $filename.'?inhibitmenu=yes',&mt('Example'),600,420,'sample')
1337: .'</span>';
1338: }
1339: $result .= '<br />'."\n";
1340: $count ++;
1341: }
1342: if ($numfiles > 0) {
1343: $result .= '</div></div>'."\n".'<div class="LC_clear_float_footer"></div>'."\n";
1344: }
1345: return $result;
1346: }
1347:
1348: sub newproblem {
1349: my ($request) = @_;
1350:
1351: if ($env{'form.mode'} eq 'blank'){
1352: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1353: &File::Copy::copy('/home/httpd/html/res/adm/includes/templates/blank.problem',$dest);
1354: &renderpage($request,$dest);
1355: return;
1356: }
1357: if ($env{'form.template'}) {
1358: my $file = $env{'form.template'};
1359: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1360: &File::Copy::copy($file,$dest);
1361: &renderpage($request,$dest);
1362: return;
1363: }
1364:
1365: my ($extension) = ($request->uri =~ m/\.(\w+)$/);
1366: &Apache::lonxml::debug("Looking for :$extension:");
1367: my $templatelist=&get_template_html($extension);
1368: if ($env{'form.newfile'} && !$templatelist) {
1369: # no templates found
1370: my $templatefilename =
1371: $request->dir_config('lonIncludes').'/templates/blank.'.$extension;
1372: &Apache::lonxml::debug("$templatefilename");
1373: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1374: &File::Copy::copy($templatefilename,$dest);
1375: &renderpage($request,$dest);
1376: } else {
1377: my $url=&HTML::Entities::encode($request->uri,'<>&"');
1378: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1379: my $errormsg;
1380: my $instructions;
1381: my $brcrum = [{'href' => &Apache::loncommon::authorspace($request->uri),
1382: 'text' => 'Authoring Space'},
1383: {'href' => '',
1384: 'text' => "Create New $extension"}];
1385: my $start_page =
1386: &Apache::loncommon::start_page("Create New $extension",
1387: undef,
1388: {'bread_crumbs' => $brcrum,});
1389: $request->print(
1390: $start_page
1391: .&Apache::loncommon::head_subbox(
1392: &Apache::loncommon::CSTR_pageheader())
1393: .'<h1>'.&mt("Creating a new $extension resource.")."</h1>
1394: $errormsg
1395: ".&mt("The requested file [_1] currently does not exist.",
1396: '<span class="LC_filename">'.$url.'</span>').'
1397: <p class="LC_info">
1398: '.&mt("To create a new $extension, select a template from the".
1399: " list below. Then click on the \"Create $extension\" button.").'
1400: </p><div><form action="'.$url.'" method="post">');
1401:
1402: if (defined($templatelist)) {
1403: $request->print($templatelist);
1404: }
1405: $request->print('<br /><input type="submit" name="newfile" value="'.
1406: &mt("Create $extension").'" />');
1407: $request->print('</form></div>'.&Apache::loncommon::end_page());
1408: }
1409: return;
1410: }
1411:
1412: sub update_construct_style {
1413: if ($env{'request.state'} eq "construct"
1414: && $env{'form.problemmode'} eq 'view'
1415: && defined($env{'form.submitted'})
1416: && !defined($env{'form.resetdata'})
1417: && !defined($env{'form.newrandomization'})) {
1418: if ((!$env{'form.style_file'} && $env{'construct.style'})
1419: ||$env{'form.clear_style_file'}) {
1420: &Apache::lonnet::delenv('construct.style');
1421: } elsif ($env{'form.style_file'}
1422: && $env{'construct.style'} ne $env{'form.style_file'}) {
1423: &Apache::lonnet::appenv({'construct.style' =>
1424: $env{'form.style_file'}});
1425: }
1426: }
1427: }
1428:
1429: #
1430: # Sets interval for current user so time left will be zero, either for the entire folder
1431: # containing the current resource, or just the resource, depending on value of first item
1432: # in interval array retrieved from EXT("resource.0.interval");
1433: #
1434: sub zero_timer {
1435: my ($symb) = @_;
1436: my ($hastimeleft,$first_access,$now);
1437: my @interval=&Apache::lonnet::EXT("resource.0.interval",$symb);
1438: if (@interval > 1) {
1439: if ($interval[1] eq 'course') {
1440: return ('fail',&mt('Ending of timed events not supported for intervals set course-wide'));
1441: } else {
1442: my $now = time;
1443: my $first_access=&Apache::lonnet::get_first_access($interval[1],$symb);
1444: if ($first_access > 0) {
1445: my ($timelimit,$donesuffix) = split(/_/,$interval[0],2);
1446: if ($donesuffix =~ /^done(?:|\:[^\:]+\:)(.*)$/) {
1447: my ($dummy,$proctor,$secret) = split(/_/,$1);
1448: if (($proctor) && ($secret ne '')) {
1449: my $key = $env{'form.LC_interval_done_proctorpass'};
1450: $key =~ s/^\s+//;
1451: $key =~ s/\s+$//;
1452: if ($env{'form.LC_interval_done_proctorpass'} ne $secret) {
1453: return ('fail',
1454: &mt('Incorrect key entered by proctor'));
1455: }
1456: }
1457: if ($first_access+$timelimit > $now) {
1458: my $done_time = $now - $first_access;
1459: my $snum = 1;
1460: if ($interval[1] eq 'map') {
1461: $snum = 2;
1462: }
1463: my $result =
1464: &Apache::lonparmset::storeparm_by_symb_inner($symb,'0_interval',
1465: $snum,$done_time,
1466: 'date_interval',
1467: $env{'user.name'},
1468: $env{'user.domain'});
1469: if ($result eq '') {
1470: # Record action in "User Notes"
1471: &Apache::lonmsg::store_instructor_comment(
1472: 'Pressed Done button for symb:<br />'.$symb,
1473: $env{'user.name'}, $env{'user.domain'});
1474: return ('ok');
1475: } else {
1476: return ('fail',&mt('Error ending timed event: [_1]',$result));
1477: }
1478: } else {
1479: return ('fail',&mt('Timed event already ended'));
1480: }
1481: } else {
1482: return ('fail',&mt('Timed event can not be ended before the time limit'));
1483: }
1484: } else {
1485: return ('fail',&mt('Timer not yet started for this timed event'));
1486: }
1487: }
1488: } else {
1489: return ('fail',&mt('No timer in use'));
1490: }
1491: return();
1492: }
1493:
1494: sub handler {
1495: #my $t0 = [&gettimeofday()];
1496: my $request=$_[0];
1497:
1498: $Apache::lonxml::request=$request;
1499: $Apache::lonxml::debug=$env{'user.debug'};
1500: $env{'request.uri'}=$request->uri;
1501: &setuppermissions();
1502:
1503: my $file=&Apache::lonnet::filelocation("",$request->uri);
1504:
1505: #check if we know where we are
1506: if ($env{'request.course.fn'} && !&Apache::lonnet::symbread('','',1,1)) {
1507: # if we are browsing we might not be able to know where we are
1508: if ($Apache::lonhomework::browse ne 'F' &&
1509: $env{'request.state'} ne "construct") {
1510: #should know where we are, so ask
1511: &unset_permissions();
1512: $request->internal_redirect('/adm/ambiguous');
1513: return OK;
1514: }
1515: }
1516: if (&setupheader($request)) {
1517: &unset_permissions();
1518: return OK;
1519: }
1520:
1521: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:$Apache::lonhomework::modifygrades:$Apache::lonhomework::queuegrade");
1522: &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
1523: my ($symb) = &Apache::lonnet::whichuser();
1524: &Apache::lonxml::debug('symb is '.$symb);
1525: if ($env{'request.state'} eq "construct") {
1526: if ( -e $file ) {
1527: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1528: ['problemmode']);
1529: if (!(defined $env{'form.problemmode'})) {
1530: #first visit to problem in construction space
1531: $env{'form.problemmode'}= 'view';
1532: &renderpage($request,$file);
1533: } elsif (($env{'form.problemmode'} eq 'editxml') ||
1534: ($env{'form.problemmode'} eq 'saveeditxml') ||
1535: ($env{'form.problemmode'} eq 'saveviewxml') ||
1536: ($env{'form.problemmode'} eq 'undoxml')) {
1537: &editxmlmode($request,$file);
1538: } elsif ($env{'form.problemmode'} eq 'calcanswers') {
1539: &analyze($request,$file);
1540: } else {
1541: &update_construct_style();
1542: &renderpage($request,$file);
1543: }
1544: } else {
1545: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
1546: ['mode']);
1547: # requested file doesn't exist in contruction space
1548: &newproblem($request);
1549: }
1550: } else {
1551: # Set the event timer to zero if the "done button" was clicked. The button is
1552: # part of the doneButton form created in lonmenu.pm
1553: my ($donebuttonresult,$donemsg);
1554: if ($symb && $env{'form.LC_interval_done'} eq 'true') {
1555: ($donebuttonresult,$donemsg) = &zero_timer($symb);
1556: undef($env{'form.LC_interval_done'});
1557: undef($env{'form.LC_interval_done_proctorpass'});
1558: }
1559: # just render the page normally outside of construction space
1560: &Apache::lonxml::debug("not construct");
1561: &renderpage($request,$file,undef,undef,$donemsg);
1562: }
1563: #my $td=&tv_interval($t0);
1564: #&Apache::lonxml::debug("Spent $td seconds processing");
1565: # always turn off debug messages
1566: $Apache::lonxml::debug=0;
1567: &unset_permissions();
1568: return OK;
1569:
1570: }
1571:
1572: sub template_dropdown_datastructure {
1573: # gathering the all templates and their path, title, category and help topic
1574: my @templates = get_template_list('problem');
1575: # template category => title
1576: my %tmplthash = ();
1577: # template title => path
1578: my %tmpltcontent = ();
1579:
1580: foreach my $template (@templates){
1581: # put in hash if the template is not empty
1582: unless ($template->[1] eq ''){
1583: push(@{$tmplthash{$template->[2]}}, $template->[1]);
1584: push(@{$tmpltcontent{$template->[1]}},$template->[0]);
1585: }
1586: }
1587:
1588: my $catList = [];
1589: foreach my $cat (sort keys %tmplthash) {
1590: my $catItems = [];
1591: foreach my $title (sort @{$tmplthash{$cat}}) {
1592: my $path = $tmpltcontent{$title}->[0];
1593: my $code;
1594: open(FH, "<$path");
1595: while(<FH>){
1596: $code.= $_ unless $_ =~ /(<problem>)|(<\/problem>)/;
1597: }
1598: close(FH);
1599:
1600: if ($code ne '') {
1601: my $href = 'javascript:insertText(\'' . &convert_for_js(&HTML::Entities::encode($code,'<>&"')) . '\')';
1602: my $currItem = [$href, $title, undef];
1603: push @{$catItems}, $currItem;
1604: }
1605: }
1606: push @{$catList}, [$catItems, $cat, undef];
1607: }
1608:
1609: return $catList;
1610: }
1611:
1612: sub responseblock_dropdown_datastructure {
1613:
1614: my $mathCat = [
1615: [
1616: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_formularesponse())) . "\')", &mt("Formula Response"), undef],
1617: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_functionplotresponse())) . "\')", &mt("Function Plot Response"), undef],
1618: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_mathresponse())) . "\')", &mt("Math Response"), undef],
1619: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_numericalresponse())) . "\')", &mt("Numerical Response"), undef]
1620: ],
1621: &mt("Math"),
1622: undef
1623: ];
1624:
1625: my $miscCat = [
1626: [
1627: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_imageresponse())) . "\')", &mt("Click on Image"), undef],
1628: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_customresponse())) . "\')", &mt("Custom Response"), undef],
1629: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_externalresponse())) . "\')", &mt("External Response"), undef],
1630: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_matchresponse())) . "\')", &mt("Match Two Lists"), undef],
1631: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_radiobuttonresponse())) . "\')", &mt("One out of N statements"), undef],
1632: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_optionresponse())) . "\')", &mt("Select from Options"), undef],
1633: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_rankresponse())) . "\')", &mt("Rank Values"), undef]
1634: ],
1635: &mt("Miscellaneous"),
1636: undef
1637: ];
1638:
1639: my $chemCat = [
1640: [
1641: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_reactionresponse())) . "\')", &mt("Chemical Reaction"), undef],
1642: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_organicresponse())) . "\')", &mt("Organic Chemical Structure"), undef]
1643: ],
1644: &mt("Chemistry"),
1645: undef
1646: ];
1647:
1648: my $textCat = [
1649: [
1650: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_stringresponse())) . "\')", &mt("String Response"), undef],
1651: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_essayresponse())) . "\')", &mt("Essay"), undef]
1652: ],
1653: &mt("Text"),
1654: undef
1655: ];
1656:
1657: return [$mathCat, $miscCat, $chemCat, $textCat];
1658: }
1659:
1660:
1661: sub conditional_scripting_datastructure {
1662: # TODO: corresponding routines should be used for the javascript:insertText parts
1663: # instead of the placeholder routine default_xml_tag with the tags
1664: # e.g. &default_xml_tag("postanswerdate") should be replaced with a routine which
1665: # returns the corresponding content for this case
1666:
1667: #TODO translated is currently temporarily here, another solution should be found where the
1668: # needed string can be retrieved
1669:
1670: my $translatedTag = '
1671: <translated>
1672: <lang which="en"></lang>
1673: <lang which="default"></lang>
1674: </translated>';
1675: return [
1676: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode($translatedTag)) . "\')", &mt("Translated Block"), undef],
1677: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("block"))) . "\')", &mt("Conditional Block"), undef],
1678: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("postanswerdate"))) . "\')", &mt("After Answer Date Block"), undef],
1679: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("preduedate"))) . "\')", &mt("Before Due Date Block"), undef],
1680: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("solved"))) . "\')", &mt("Block For After Solved"), undef],
1681: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("notsolved"))) . "\')", &mt("Block For When Not Solved"), undef]
1682: ];
1683: }
1684:
1685: sub misc_datastructure {
1686: return [
1687: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_img())) . "\')", &mt("Image"), undef],
1688: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::lonplot::insert_gnuplot())) . "\')", &mt("GNU Plot"), undef],
1689: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_organicstructure())) . "\')", &mt("Organic Structure"), undef],
1690: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::edit::insert_script())) . "\')", &mt("Script Block"), undef],
1691: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("allow"))) . "\')", &mt("File Dependencies"), undef],
1692: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("import"))) . "\')", &mt("Import a File"), undef],
1693: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&Apache::londefdef::insert_meta())) . "\')", &mt("Custom Metadata"), undef],
1694: ["javascript:insertText(\'" . &convert_for_js(&HTML::Entities::encode(&default_xml_tag("part"))) . "\')", &mt("Problem Part"), undef]
1695: ];
1696: }
1697:
1698: # helper routine for the datastructure building subroutines
1699: sub default_xml_tag {
1700: my ($tag) = @_;
1701: return "\n<$tag></$tag>";
1702: }
1703:
1704:
1705: sub helpmenu_datastructure {
1706:
1707: my $width = 500;
1708: my $height = 600;
1709:
1710: my $helpers = [
1711: ['Problem_LON-CAPA_Functions', &mt('Script Functions')],
1712: ['Greek_Symbols', &mt('Greek Symbols')],
1713: ['Other_Symbols', &mt('Other Symbols')],
1714: ['Authoring_Output_Tags', &mt('Output Tags')],
1715: ['Authoring_Multilingual_Problems',
1716: &mt('How to create problems in different languages')]
1717: ];
1718:
1719: my $help_structure = [];
1720:
1721: foreach my $count (0..(scalar(@{$helpers})-1)) {
1722: my $filename = $helpers->[$count]->[0];
1723: my $title = $helpers->[$count]->[1];
1724: my $href = &HTML::Entities::encode("javascript:openMyModal('/adm/help/$filename.hlp',$width,$height,'yes');");
1725: push @{$help_structure}, [$href, $title, undef];
1726: }
1727:
1728: return $help_structure;
1729: }
1730:
1731: # we need substitution to not break javascript code
1732: sub convert_for_js {
1733: my $return = shift;
1734: $return =~ s|script|ESCAPEDSCRIPT|g;
1735: $return =~ s|\\|\\\\|g;
1736: $return =~ s|\n|\\r\\n|g;
1737: $return =~ s|'|\\'|g;
1738: $return =~ s|'|\\'|g;
1739: return $return;
1740: }
1741:
1742: 1;
1743: __END__
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