Annotation of loncom/homework/lonhomework.pm, revision 1.211
1.63 albertel 1: # The LearningOnline Network with CAPA
1.52 albertel 2: # The LON-CAPA Homework handler
1.63 albertel 3: #
1.211 ! albertel 4: # $Id: lonhomework.pm,v 1.210 2005/06/04 07:47:51 albertel Exp $
1.63 albertel 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/
1.159 www 27:
1.1 albertel 28:
29: package Apache::lonhomework;
30: use strict;
1.73 albertel 31: use Apache::style();
32: use Apache::lonxml();
1.204 albertel 33: use Apache::lonnet;
1.73 albertel 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();
1.83 albertel 41: use Apache::caparesponse();
42: use Apache::radiobuttonresponse();
43: use Apache::optionresponse();
44: use Apache::imageresponse();
45: use Apache::essayresponse();
46: use Apache::externalresponse();
1.106 albertel 47: use Apache::rankresponse();
1.107 albertel 48: use Apache::matchresponse();
1.137 albertel 49: use Apache::chemresponse();
1.169 albertel 50: use Apache::drawimage();
1.26 www 51: use Apache::Constants qw(:common);
1.73 albertel 52: use HTML::Entities();
1.83 albertel 53: use Apache::loncommon();
1.146 albertel 54: use Apache::lonlocal;
1.179 albertel 55: use Time::HiRes qw( gettimeofday tv_interval );
1.188 foxr 56: use Apache::lonnet();
57:
1.189 albertel 58: # FIXME - improve commenting
1.188 foxr 59:
1.43 albertel 60:
1.69 harris41 61: BEGIN {
1.145 albertel 62: &Apache::lonxml::register_insert();
1.43 albertel 63: }
64:
1.188 foxr 65:
66: #
1.189 albertel 67: # Decides what targets to render for.
1.188 foxr 68: # Implicit inputs:
69: # Various session environment variables:
1.189 albertel 70: # request.state - published - is a /res/ resource
71: # uploaded - is a /uploaded/ resource
72: # contruct - is a /priv/ resource
73: # form.grade_target - a form parameter requesting a specific target
1.5 albertel 74: sub get_target {
1.204 albertel 75: &Apache::lonxml::debug("request.state = $env{'request.state'}");
76: if( defined($env{'form.grade_target'})) {
77: &Apache::lonxml::debug("form.grade_target= $env{'form.grade_target'}");
1.188 foxr 78: } else {
1.189 albertel 79: &Apache::lonxml::debug("form.grade_target <undefined>");
1.188 foxr 80: }
1.204 albertel 81: if (($env{'request.state'} eq "published") ||
82: ($env{'request.state'} eq "uploaded")) {
83: if ( defined($env{'form.grade_target'} )
84: && ($env{'form.grade_target'} eq 'tex')) {
85: return ($env{'form.grade_target'});
86: } elsif ( defined($env{'form.grade_target'} )
1.145 albertel 87: && ($Apache::lonhomework::viewgrades eq 'F' )) {
1.207 albertel 88: return ($env{'form.grade_target'});
89: }
90: if ($env{'form.webgrade'} &&
91: $Apache::lonhomework::modifygrades eq 'F') {
92: return ('grade','webgrade');
1.145 albertel 93: }
1.204 albertel 94: if ( defined($env{'form.submitted'}) &&
95: ( !defined($env{'form.resetdata'})) &&
96: ( !defined($env{'form.newrandomization'}))) {
1.145 albertel 97: return ('grade', 'web');
98: } else {
99: return ('web');
100: }
1.204 albertel 101: } elsif ($env{'request.state'} eq "construct") {
102: if ( defined($env{'form.grade_target'}) ) {
103: return ($env{'form.grade_target'});
1.145 albertel 104: }
1.204 albertel 105: if ( defined($env{'form.preview'})) {
106: if ( defined($env{'form.submitted'})) {
1.145 albertel 107: return ('grade', 'web');
108: } else {
109: return ('web');
110: }
111: } else {
1.204 albertel 112: if ( $env{'form.problemmode'} eq &mt('View') ||
113: $env{'form.problemmode'} eq &mt('Discard Edits and View')) {
114: if ( defined($env{'form.submitted'}) &&
115: (!defined($env{'form.resetdata'})) &&
116: (!defined($env{'form.newrandomization'}))) {
1.145 albertel 117: return ('grade', 'web','answer');
118: } else {
119: return ('web','answer');
120: }
1.204 albertel 121: } elsif ( $env{'form.problemmode'} eq &mt('Edit') ||
122: $env{'form.problemmode'} eq 'Edit') {
123: if ( $env{'form.submitted'} eq 'edit' ) {
124: if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
1.145 albertel 125: return ('modified','web','answer');
126: } else {
1.211 ! albertel 127: return ('modified','no_output_web','edit');
1.145 albertel 128: }
129: } else {
1.211 ! albertel 130: return ('no_output_web','edit');
1.145 albertel 131: }
132: } else {
133: return ('web');
134: }
135: }
1.15 albertel 136: }
1.145 albertel 137: return ();
1.5 albertel 138: }
139:
1.3 albertel 140: sub setup_vars {
1.145 albertel 141: my ($target) = @_;
142: return ';'
1.11 albertel 143: # return ';$external::target='.$target.';';
1.2 albertel 144: }
145:
146: sub send_header {
1.145 albertel 147: my ($request)= @_;
148: $request->print(&Apache::lontexconvert::header());
1.204 albertel 149: # $request->print('<form name='.$env{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
1.2 albertel 150: }
151:
1.36 albertel 152: sub createmenu {
1.145 albertel 153: my ($which,$request)=@_;
154: if ($which eq 'grade') {
155: $request->print('<script language="JavaScript">
1.91 albertel 156: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
1.52 albertel 157: "height=350,width=150,menubar=no");
158: </script>');
1.145 albertel 159: }
1.36 albertel 160: }
161:
1.2 albertel 162: sub send_footer {
1.145 albertel 163: my ($request)= @_;
1.16 albertel 164: # $request->print('</form>');
1.145 albertel 165: $request->print(&Apache::lontexconvert::footer());
1.2 albertel 166: }
167:
1.200 albertel 168: sub proctor_checked_in {
1.207 albertel 169: my ($slot_name,$slot)=@_;
1.202 albertel 170: my @allowed=split(",",$slot->{'proctor'});
1.208 albertel 171: my $version=$Apache::lonhomework::history{'resource.version'};
1.202 albertel 172: foreach my $possible (@allowed) {
1.208 albertel 173: if ($Apache::lonhomework::history{"resource.$version.checkedin"} eq
174: $possible &&
175: $Apache::lonhomework::history{"resource.$version.checkedin.slot"}
176: eq $slot_name) {
1.202 albertel 177: return 1;
178: }
179: }
1.200 albertel 180: return 0;
181: }
182:
1.52 albertel 183: $Apache::lonxml::browse='';
1.152 albertel 184: sub check_ip_acc {
185: my ($acc)=@_;
1.154 albertel 186: if (!defined($acc) || $acc =~ /^\s*$/) { return 1; }
1.152 albertel 187: my $allowed=0;
188: my $ip=$ENV{'REMOTE_ADDR'};
189: my $name;
190: foreach my $pattern (split(',',$acc)) {
191: if ($pattern =~ /\*$/) {
192: #35.8.*
193: $pattern=~s/\*//;
194: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
195: } elsif ($pattern =~ /(\d+\.\d+\.\d+)\.\[(\d+)-(\d+)\]$/) {
196: #35.8.3.[34-56]
197: my $low=$2;
198: my $high=$3;
199: $pattern=$1;
200: if ($ip =~ /^\Q$pattern\E/) {
201: my $last=(split(/\./,$ip))[3];
202: if ($last <=$high && $last >=$low) { $allowed=1; }
203: }
204: } elsif ($pattern =~ /^\*/) {
205: #*.msu.edu
206: $pattern=~s/\*//;
207: if (!defined($name)) {
208: use Socket;
209: my $netaddr=inet_aton($ip);
210: ($name)=gethostbyaddr($netaddr,AF_INET);
1.158 albertel 211: }
1.152 albertel 212: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
213: } elsif ($pattern =~ /\d+\.\d+\.\d+\.\d+/) {
214: #127.0.0.1
215: if ($ip =~ /^\Q$pattern\E/) { $allowed=1; }
216: } else {
217: #some.name.com
218: if (!defined($name)) {
219: use Socket;
220: my $netaddr=inet_aton($ip);
221: ($name)=gethostbyaddr($netaddr,AF_INET);
222: }
223: if ($name =~ /\Q$pattern\E$/i) { $allowed=1; }
224: }
225: if ($allowed) { last; }
226: }
227: return $allowed;
228: }
1.198 albertel 229:
230: sub check_task_access {
1.207 albertel 231: # does it pass normal muster
232: # yes we really do want the default args passing
1.200 albertel 233: my ($status,$datemsg)=&check_access;
234: if ($status eq 'SHOW_ANSWER' ||
235: $status eq 'CLOSED' ||
236: $status eq 'CANNOT_ANSWER' ||
237: $status eq 'INVALID_ACCESS' ||
238: $status eq 'UNAVAILABLE') {
239: return ($status,$datemsg);
240: }
1.204 albertel 241: if ($env{'request.state'} eq "construct") {
1.203 albertel 242: return ($status,$datemsg);
243: }
1.208 albertel 244: my $version=$Apache::lonhomework::history{'resource.version'};
1.209 albertel 245: if ($Apache::lonhomework::history{"resource.$version.checkedin"} &&
246: $Apache::lonhomework::history{"resource.$version.status"} eq 'pass') {
247: return ('SHOW_ANSWER');
1.207 albertel 248: }
1.200 albertel 249: my ($id)=@_;
1.210 albertel 250: my @slots=
251: (split(':',&Apache::lonnet::EXT("resource.$id.availablestudent")),
252: split(':',&Apache::lonnet::EXT("resource.$id.available")));
253:
1.200 albertel 254: # if (!@slots) {
255: # return ($status,$datemsg);
256: # }
257: my $slotstatus='NOT_IN_A_SLOT';
1.206 albertel 258: my ($returned_slot,$slot_name);
1.210 albertel 259: foreach my $slot (@slots) {
1.201 albertel 260: &Apache::lonxml::debug("getting $slot");
1.200 albertel 261: my %slot=&Apache::lonnet::get_slot($slot);
1.201 albertel 262: &Apache::lonhomework::showhash(%slot);
1.200 albertel 263: if ($slot{'starttime'} < time &&
264: $slot{'endtime'} > time &&
1.201 albertel 265: &check_ip_acc($slot{'ip'})) {
1.202 albertel 266: &Apache::lonxml::debug("$slot is good");
267: $slotstatus='NEEDS_CHECKIN';
268: $returned_slot=\%slot;
1.206 albertel 269: $slot_name=$slot;
1.200 albertel 270: last;
271: }
272: }
1.202 albertel 273: if ($slotstatus eq 'NEEDS_CHECKIN' &&
1.207 albertel 274: &proctor_checked_in($slot_name,$returned_slot)) {
1.202 albertel 275: &Apache::lonxml::debug("protoctor checked in");
1.200 albertel 276: $slotstatus='CAN_ANSWER';
277: }
1.209 albertel 278: if ( $slotstatus eq 'NOT_IN_A_SLOT' &&
1.208 albertel 279: $Apache::lonhomework::history{"resource.$version.checkedin"}) {
1.209 albertel 280: if ($Apache::lonhomework::history{"resource.$version.status"} eq 'fail') {
281: return ('SHOW_ANSWER');
282: } else {
283: return ('WAITING_FOR_GRADE');
284: }
1.207 albertel 285: }
1.206 albertel 286: return ($slotstatus,$datemsg,$slot_name,$returned_slot);
1.198 albertel 287: }
1.200 albertel 288:
1.92 bowersj2 289: # JB, 9/24/2002: Any changes in this function may require a change
290: # in lonnavmaps::resource::getDateStatus.
1.53 www 291: sub check_access {
1.145 albertel 292: my ($id) = @_;
293: my $date ='';
294: my $status;
295: my $datemsg = '';
296: my $lastdate = '';
297: my $temp;
298: my $type;
299: my $passed;
300:
1.204 albertel 301: if ($env{'request.state'} eq "construct") {
302: if ($env{'form.problemstate'}) {
303: if ($env{'form.problemstate'} =~ /^CANNOT_ANSWER/) {
304: if ( ! ($env{'form.problemstate'} eq 'CANNOT_ANSWER_correct' &&
1.167 albertel 305: lc($Apache::lonhomework::problemstatus) eq 'no')) {
1.168 albertel 306: return ('CANNOT_ANSWER',
1.174 www 307: &mt('is in this state due to author settings.'));
1.167 albertel 308: }
1.165 albertel 309: } else {
1.204 albertel 310: return ($env{'form.problemstate'},
1.174 www 311: &mt('is in this state due to author settings.'));
1.165 albertel 312: }
313: }
1.145 albertel 314: &Apache::lonxml::debug("in construction ignoring dates");
315: $status='CAN_ANSWER';
1.146 albertel 316: $datemsg=&mt('is in under construction');
1.163 albertel 317: # return ($status,$datemsg);
1.145 albertel 318: }
319:
320: &Apache::lonxml::debug("checking for part :$id:");
321: &Apache::lonxml::debug("time:".time);
1.152 albertel 322:
1.204 albertel 323: if ($env{'request.state'} ne "construct") {
1.163 albertel 324: my $allowed=&check_ip_acc(&Apache::lonnet::EXT("resource.$id.acc"));
325: if (!$allowed && ($Apache::lonhomework::browse ne 'F')) {
326: $status='INVALID_ACCESS';
327: $date=&mt("can not be accessed from your location.");
1.145 albertel 328: return($status,$date);
329: }
1.163 albertel 330:
331: foreach $temp ("opendate","duedate","answerdate") {
332: $lastdate = $date;
333: $date = &Apache::lonnet::EXT("resource.$id.$temp");
334: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
335: if ($thistype =~ /^(con_lost|no_such_host)/ ||
336: $date =~ /^(con_lost|no_such_host)/) {
337: $status='UNAVAILABLE';
338: $date=&mt("may open later.");
339: return($status,$date);
340: }
341: if ($thistype eq 'date_interval') {
342: if ($temp eq 'opendate') {
343: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
344: }
345: if ($temp eq 'answerdate') {
346: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
347: }
1.145 albertel 348: }
1.163 albertel 349: &Apache::lonxml::debug("found :$date: for :$temp:");
350: if ($date eq '') {
351: $date = &mt("an unknown date"); $passed = 0;
352: } elsif ($date eq 'con_lost') {
353: $date = &mt("an indeterminate date"); $passed = 0;
354: } else {
355: if (time < $date) { $passed = 0; } else { $passed = 1; }
356: $date = localtime $date;
1.145 albertel 357: }
1.163 albertel 358: if (!$passed) { $type=$temp; last; }
1.145 albertel 359: }
1.163 albertel 360: &Apache::lonxml::debug("have :$type:$passed:");
361: if ($passed) {
362: $status='SHOW_ANSWER';
363: $datemsg=$date;
364: } elsif ($type eq 'opendate') {
365: $status='CLOSED';
366: $datemsg = &mt("will open on")." $date";
367: } elsif ($type eq 'duedate') {
368: $status='CAN_ANSWER';
369: $datemsg = &mt("is due at")." $date";
370: } elsif ($type eq 'answerdate') {
371: $status='CLOSED';
372: $datemsg = &mt("was due on")." $lastdate".&mt(", and answers will be available on")." $date";
1.145 albertel 373: }
374: }
375: if ($status eq 'CAN_ANSWER') {
376: #check #tries, and if correct.
377: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
378: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
379: if ( $tries eq '' ) { $tries = '0'; }
1.164 albertel 380: if ( $maxtries eq '' &&
1.204 albertel 381: $env{'request.state'} ne 'construct') { $maxtries = '2'; }
1.164 albertel 382: if ($maxtries && $tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
1.145 albertel 383: # if (correct and show prob status) or excused then CANNOT_ANSWER
384: if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
385: &&
386: lc($Apache::lonhomework::problemstatus) ne 'no')
387: ||
388: $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
389: $status = 'CANNOT_ANSWER';
390: }
1.121 albertel 391: }
1.181 albertel 392: if ($status eq 'CAN_ANSWER' || $status eq 'CANNOT_ANSWER') {
1.177 albertel 393: my $interval=&Apache::lonnet::EXT("resource.$id.interval");
394: &Apache::lonxml::debug("looking for interval $interval");
395: if ($interval) {
396: my $first_access=&Apache::lonnet::get_first_access('map');
397: &Apache::lonxml::debug("looking for accesstime $first_access");
398: if (!$first_access) {
399: $status='NOT_YET_VIEWED';
1.192 albertel 400: $datemsg=&seconds_to_human_length($interval);
1.177 albertel 401: } else {
402: my $newdate=localtime($first_access+$interval);
403: if (time > ($first_access+$interval)) {
404: $status='CLOSED';
405: $datemsg = &mt("was due on")." $newdate".&mt(", and answers will be available on")." $date";
406: } else {
407: $datemsg = &mt("is due at")." $newdate";
408: }
409: }
410: }
411: }
1.133 albertel 412: #if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
413: # (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
414: # return ('UNCHECKEDOUT','needs to be checked out');
415: #}
1.54 www 416:
417:
1.145 albertel 418: &Apache::lonxml::debug("sending back :$status:$datemsg:");
419: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
420: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
421: $status='CAN_ANSWER';
1.146 albertel 422: $datemsg=&mt('is closed but you are allowed to view it');
1.145 albertel 423: }
1.106 albertel 424:
1.145 albertel 425: return ($status,$datemsg);
1.20 albertel 426: }
427:
1.192 albertel 428: sub seconds_to_human_length {
429: my ($length)=@_;
430:
431: my $seconds=$length%60; $length=int($length/60);
432: my $minutes=$length%60; $length=int($length/60);
433: my $hours=$length%24; $length=int($length/24);
434: my $days=$length;
435:
436: my $timestr;
437: if ($days > 0) { $timestr.=&mt('[quant,_1,day]',$days); }
438: if ($hours > 0) { $timestr.=($timestr?", ":"").
439: &mt('[quant,_1,hour]',$hours); }
440: if ($minutes > 0) { $timestr.=($timestr?", ":"").
441: &mt('[quant,_1,minute]',$minutes); }
442: if ($seconds > 0) { $timestr.=($timestr?", ":"").
443: &mt('[quant,_1,second]',$seconds); }
444: return $timestr;
445: }
446:
1.41 albertel 447: sub showhash {
1.145 albertel 448: my (%hash) = @_;
449: &showhashsubset(\%hash,'.');
450: return '';
1.79 albertel 451: }
452:
1.106 albertel 453: sub showarray {
454: my ($array)=@_;
455: my $string="(";
456: foreach my $elm (@{ $array }) {
1.193 albertel 457: if (ref($elm) eq 'ARRAY') {
458: $string.=&showarray($elm);
459: } elsif (ref($elm) eq 'HASH') {
460: $string.= "HASH --- \n<br />";
461: $string.= &showhashsubset($elm,'.');
1.106 albertel 462: } else {
463: $string.="$elm,"
464: }
465: }
466: chop($string);
467: $string.=")";
468: return $string;
469: }
470:
1.79 albertel 471: sub showhashsubset {
1.145 albertel 472: my ($hash,$keyre) = @_;
473: my $resultkey;
474: foreach $resultkey (sort keys %$hash) {
1.193 albertel 475: if ($resultkey !~ /$keyre/) { next; }
476: if (ref($$hash{$resultkey}) eq 'ARRAY' ) {
477: &Apache::lonxml::debug("$resultkey ---- ".
478: &showarray($$hash{$resultkey}));
479: } elsif (ref($$hash{$resultkey}) eq 'HASH' ) {
480: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
481: &showhashsubset($$hash{$resultkey},'.');
482: } else {
483: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
1.145 albertel 484: }
485: }
486: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
487: return '';
1.41 albertel 488: }
489:
490: sub setuppermissions {
1.204 albertel 491: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$env{'request.filename'});
492: my $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'});
1.145 albertel 493: if (! $viewgrades &&
1.204 albertel 494: exists($env{'request.course.sec'}) &&
495: $env{'request.course.sec'} !~ /^\s*$/) {
496: $viewgrades = &Apache::lonnet::allowed('vgr',$env{'request.course.id'}.
497: '/'.$env{'request.course.sec'});
1.145 albertel 498: }
1.188 foxr 499: $Apache::lonhomework::viewgrades = $viewgrades; # File global variable...dirt.
1.185 albertel 500: if ($Apache::lonhomework::browse eq 'F' &&
1.204 albertel 501: $env{'form.devalidatecourseresdata'} eq 'on') {
1.185 albertel 502: my (undef,$courseid) = &Apache::lonxml::whichuser();
1.204 albertel 503: &Apache::lonnet::devalidatecourseresdata($env{"course.$courseid.num"},
504: $env{"course.$courseid.domain"});
1.185 albertel 505: }
1.205 albertel 506: my $modifygrades = &Apache::lonnet::allowed('mgr',$env{'request.course.id'});
507: if (! $modifygrades &&
508: exists($env{'request.course.sec'}) &&
509: $env{'request.course.sec'} !~ /^\s*$/) {
510: $modifygrades =
511: &Apache::lonnet::allowed('mgr',$env{'request.course.id'}.
512: '/'.$env{'request.course.sec'});
513: }
514: $Apache::lonhomework::modifygrades = $modifygrades;
515: return '';
1.41 albertel 516: }
517:
518: sub setupheader {
1.120 albertel 519: my $request=$_[0];
1.197 albertel 520: &Apache::loncommon::content_type($request,'text/html');
1.120 albertel 521: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
522: &Apache::loncommon::no_cache($request);
523: }
1.196 albertel 524: # $request->set_last_modified(&Apache::lonnet::metadata($request->uri,
525: # 'lastrevisiondate'));
1.120 albertel 526: $request->send_http_header;
527: return OK if $request->header_only;
528: return ''
1.41 albertel 529: }
1.35 albertel 530:
1.47 albertel 531: sub handle_save_or_undo {
1.145 albertel 532: my ($request,$problem,$result) = @_;
533: my $file = &Apache::lonnet::filelocation("",$request->uri);
534: my $filebak =$file.".bak";
535: my $filetmp =$file.".tmp";
536: my $error=0;
1.156 albertel 537:
538: &Apache::lonnet::correct_line_ends($result);
1.52 albertel 539:
1.204 albertel 540: if ($env{'form.Undo'} eq &mt('undo')) {
1.145 albertel 541: my $error=0;
542: if (!copy($file,$filetmp)) { $error=1; }
543: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
544: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
545: if (!$error) {
1.171 albertel 546: &Apache::lonxml::info("<p><b>".&mt("Undid changes, Switched")." $filebak ".&mt("and")." $file</b></p>");
1.145 albertel 547: } else {
1.171 albertel 548: &Apache::lonxml::info("<p><font color=\"red\" size=\"+1\"><b>".&mt("Unable to undo, unable to switch")." $filebak ".&mt("and")." $file</b></font></p>");
1.145 albertel 549: $error=1;
550: }
1.52 albertel 551: } else {
1.145 albertel 552: my $fs=Apache::File->new(">$filebak");
553: if (defined($fs)) {
554: print $fs $$problem;
1.171 albertel 555: &Apache::lonxml::info("<b>".&mt("Making Backup to").
556: " $filebak</b>");
1.145 albertel 557: } else {
1.171 albertel 558: &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".&mt("Unable to make backup")." $filebak</b></font>");
1.145 albertel 559: $error=2;
560: }
561: my $fh=Apache::File->new(">$file");
562: if (defined($fh)) {
563: print $fh $$result;
1.171 albertel 564: &Apache::lonxml::info("<b>".&mt("Saving Modifications to").
565: " $file</b>");
1.145 albertel 566: } else {
1.171 albertel 567: &Apache::lonxml::info("<font color=\"red\" size=\"+1\"><b>".
568: &mt("Unable to write to")." $file</b></font>");
1.145 albertel 569: $error|=4;
570: }
1.52 albertel 571: }
1.145 albertel 572: return $error;
1.64 albertel 573: }
574:
1.101 albertel 575: sub analyze_header {
576: my ($request) = @_;
1.183 albertel 577: my $bodytag='<body bgcolor="#ffffff">';
1.204 albertel 578: if ($env{'environment.remote'} eq 'off') {
1.183 albertel 579: $bodytag=&Apache::loncommon::bodytag();
580: }
1.197 albertel 581: my $html=&Apache::lonxml::xmlbegin();
582: my $result.=$html.'
1.146 albertel 583: <head><title>'.&mt("Analyzing a problem").'</title></head>
1.183 albertel 584: '.$bodytag.&Apache::lonxml::message_location().'
1.101 albertel 585: <form name="lonhomework" method="POST" action="'.
1.204 albertel 586: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
1.179 albertel 587: &Apache::structuretags::remember_problem_state().'
1.146 albertel 588: <input type="submit" name="problemmode" value="'.&mt("EditXML").'" />
589: <input type="submit" name="problemmode" value="'.&mt('Edit').'" />
1.101 albertel 590: <hr />
1.146 albertel 591: <input type="submit" name="submit" value="'.&mt("View").'" />
1.101 albertel 592: <hr />
593: </form>';
1.171 albertel 594: &Apache::lonxml::add_messages(\$result);
1.101 albertel 595: $request->print($result);
596: $request->rflush();
597: }
598:
1.109 albertel 599: sub analyze_footer {
600: my ($request) = @_;
601: my $result='</body></html>';
602: $request->print($result);
603: $request->rflush();
604: }
605:
1.74 albertel 606: sub analyze {
1.101 albertel 607: my ($request,$file) = @_;
608: &Apache::lonxml::debug("Analyze");
609: my $result;
610: my %overall;
611: my %allparts;
1.204 albertel 612: my $rndseed=$env{'form.rndseed'};
1.101 albertel 613: &analyze_header($request);
1.114 albertel 614: my %prog_state=
1.146 albertel 615: &Apache::lonhtmlcommon::Create_PrgWin($request,&mt('Analyze Progress'),
616: &mt('Getting Problem Variants'),
1.204 albertel 617: $env{'form.numtoanalyze'},
1.175 albertel 618: 'inline',undef);
1.204 albertel 619: for(my $i=1;$i<$env{'form.numtoanalyze'}+1;$i++) {
1.114 albertel 620: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
1.146 albertel 621: &mt('last problem'));
1.182 albertel 622: if (&Apache::loncommon::connection_aborted($request)) { return; }
1.101 albertel 623: my $subresult=&Apache::lonnet::ssi($request->uri,
624: ('grade_target' => 'analyze'),
1.130 albertel 625: ('rndseed' => $i+$rndseed));
1.101 albertel 626: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
627: my %analyze=&Apache::lonnet::str2hash($subresult);
1.114 albertel 628: my @parts;
629: if (defined(@{ $analyze{'parts'} })) {
630: @parts=@{ $analyze{'parts'} };
631: }
1.101 albertel 632: foreach my $part (@parts) {
633: if (!exists($allparts{$part})) {$allparts{$part}=1;};
1.109 albertel 634: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
635: $analyze{$part.'.type'} eq 'stringresponse' ||
636: $analyze{$part.'.type'} eq 'formularesponse' ) {
1.101 albertel 637: push( @{ $overall{$part.'.answer'} },
638: [@{ $analyze{$part.'.answer'} }]);
639: }
640: }
641: }
1.114 albertel 642: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
1.146 albertel 643: &mt('Analyzing Results'));
1.175 albertel 644: $request->print('<hr />'.&mt('List of possible answers').': ');
1.134 albertel 645: foreach my $part (sort(keys(%allparts))) {
1.109 albertel 646: if (defined(@{ $overall{$part.'.answer'} })) {
1.132 albertel 647: my $num_cols=scalar(@{ $overall{$part.'.answer'}->[0] });
1.184 albertel 648: $request->print('<table><tr><th colspan="'.($num_cols+1).'">'.&mt('Part').' '.$part.'</th></tr>');
1.130 albertel 649: my %frequency;
1.109 albertel 650: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
1.132 albertel 651: $frequency{join("\0",@{ $answer })}++;
1.130 albertel 652: }
1.184 albertel 653: $request->print('<tr><th colspan="'.($num_cols).'">'.&mt('Answer').'</th><th>'.&mt('Frequency').'</th></tr>');
1.132 albertel 654: foreach my $answer (sort {(split("\0",$a))[0] <=> (split("\0",$b))[0]} (keys(%frequency))) {
655: $request->print('<tr><td align="right">'.
656: join('</td><td align="right">',split("\0",$answer)).
1.130 albertel 657: '</td><td>('.$frequency{$answer}.
658: ')</td></tr>');
1.109 albertel 659: }
660: $request->print('</table>');
661: } else {
1.162 albertel 662: $request->print('<p>'.&mt('Response').' '.$part.' '.
1.146 albertel 663: &mt('is not analyzable at this time').'</p>');
1.101 albertel 664: }
665: }
1.130 albertel 666: if (scalar(keys(%allparts)) == 0 ) {
1.162 albertel 667: $request->print('<p>'.&mt('Found no analyzable respones in this problem, currently only Numerical, Formula and String response styles are supported.').'</p>');
1.130 albertel 668: }
1.114 albertel 669: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
1.109 albertel 670: &analyze_footer($request);
1.101 albertel 671: &Apache::lonhomework::showhash(%overall);
672: return $result;
1.74 albertel 673: }
674:
1.64 albertel 675: sub editxmlmode {
1.145 albertel 676: my ($request,$file) = @_;
677: my $result;
678: my $problem=&Apache::lonnet::getfile($file);
679: if ($problem eq -1) {
1.146 albertel 680: &Apache::lonxml::error("<b> ".&mt('Unable to find').
681: " <i>$file</i></b>");
1.145 albertel 682: $problem='';
683: }
1.204 albertel 684: if (defined($env{'form.editxmltext'}) || defined($env{'form.Undo'})) {
1.145 albertel 685: my $error=&handle_save_or_undo($request,\$problem,
1.204 albertel 686: \$env{'form.editxmltext'});
1.145 albertel 687: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
688: }
1.204 albertel 689: &Apache::lonhomework::showhashsubset(\%env,'^form');
690: if ( $env{'form.submit'} eq &mt('Submit Changes and View') ) {
691: &Apache::lonhomework::showhashsubset(\%env,'^form');
692: $env{'form.problemmode'}='View';
1.145 albertel 693: &renderpage($request,$file);
694: } else {
695: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
1.160 www 696: my $xml_help = '<table><tr><td>'.
697: &Apache::loncommon::helpLatexCheatsheet("Problem_Editor_XML_Index",
698: "Problem Editing Help").
699: '</td><td>'.
1.178 albertel 700: &Apache::loncommon::help_open_menu('',undef,undef,undef,5,'Authoring').
701: '</td></tr></table>';
1.145 albertel 702: if ($cols > 80) { $cols = 80; }
703: if ($cols < 70) { $cols = 70; }
704: if ($rows < 20) { $rows = 20; }
1.183 albertel 705: my $bodytag='<body bgcolor="#ffffff">';
1.204 albertel 706: if ($env{'environment.remote'} eq 'off') {
1.183 albertel 707: $bodytag=&Apache::loncommon::bodytag();
708: }
1.197 albertel 709: my $html=&Apache::lonxml::xmlbegin();
710: $result.=$html.$bodytag.&Apache::lonxml::message_location().'
1.64 albertel 711: <form name="lonhomework" method="POST" action="'.
1.204 albertel 712: &HTML::Entities::encode($env{'request.uri'},'<>&"').'">'.
1.179 albertel 713: &Apache::structuretags::remember_problem_state().'
1.146 albertel 714: <input type="hidden" name="problemmode" value="'.&mt('EditXML').'" />
1.170 matthew 715: <input type="submit" name="problemmode" accesskey="d" value="'.&mt('Discard Edits and View').'" />
716: <input type="submit" name="problemmode" accesskey="e" value="'.&mt('Edit').'" />
1.64 albertel 717: <hr />
1.170 matthew 718: <input type="submit" name="submit" accesskey="s" value="'.&mt('Submit Changes').'" />
719: <input type="submit" name="submit" accesskey="v" value="'.&mt('Submit Changes and View').'" />
720: <input type="submit" name="Undo" accesskey="u" value="'.&mt('undo').'" />
1.64 albertel 721: <hr />
1.110 albertel 722: ' . $xml_help . '
1.199 albertel 723: <textarea style="width:100%" rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
1.172 albertel 724: &HTML::Entities::encode($problem,'<>&"').'</textarea>
1.64 albertel 725: </form></body></html>';
1.171 albertel 726: &Apache::lonxml::add_messages(\$result);
1.145 albertel 727: $request->print($result);
728: }
729: return '';
1.47 albertel 730: }
1.189 albertel 731:
1.188 foxr 732: #
733: # Render the page in whatever target desired.
734: #
1.41 albertel 735: sub renderpage {
1.211 ! albertel 736: my ($request,$file,$targets) = @_;
1.52 albertel 737:
1.211 ! albertel 738: my @targets = @{$targets || [&get_target()]};
1.204 albertel 739: &Apache::lonhomework::showhashsubset(\%env,'form.');
1.145 albertel 740: &Apache::lonxml::debug("Running targets ".join(':',@targets));
1.171 albertel 741: my $overall_result;
1.145 albertel 742: foreach my $target (@targets) {
1.183 albertel 743: # FIXME need to do something intelligent when a problem goes
744: # from viewable to not viewable due to map conditions
745: #&setuppermissions();
746: #if ( $Apache::lonhomework::browse ne '2'
747: # && $Apache::lonhomework::browse ne 'F' ) {
748: # $request->print(" You most likely shouldn't see me.");
749: #}
1.145 albertel 750: #my $t0 = [&gettimeofday()];
1.211 ! albertel 751: my $output=1;
! 752: if ($target eq 'no_output_web') {
! 753: $target = 'web'; $output=0;
! 754: }
1.145 albertel 755: my $problem=&Apache::lonnet::getfile($file);
756: if ($problem eq -1) {
1.146 albertel 757: &Apache::lonxml::error("<b> ".&mt('Unable to find')." <i>$file</i></b>");
1.145 albertel 758: $problem='';
759: }
1.52 albertel 760:
1.145 albertel 761: my %mystyle;
762: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
763: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
1.204 albertel 764: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%env,'^form');}
1.145 albertel 765:
766: &Apache::lonxml::debug("Should be parsing now");
1.211 ! albertel 767: my $result = &Apache::lonxml::xmlparse($request, $target, $problem,
! 768: &setup_vars($target),%mystyle);
1.145 albertel 769: undef($Apache::lonhomework::parsing_a_problem);
1.211 ! albertel 770: if (!$output) { $result = &Apache::lonxml::message_location(); }
1.145 albertel 771: #$request->print("Result follows:");
772: if ($target eq 'modified') {
773: &handle_save_or_undo($request,\$problem,\$result);
774: } else {
775: if ($target eq 'analyze') {
776: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
777: undef(%Apache::lonhomework::analyze);
778: }
779: #my $td=&tv_interval($t0);
780: #if ( $Apache::lonxml::debug) {
781: #$result =~ s:</body>::;
782: #$result.="<br />Spent $td seconds processing target $target\n</body>";
783: #}
1.171 albertel 784: # $request->print($result);
785: $overall_result.=$result;
786: # $request->rflush();
1.145 albertel 787: }
788: #$request->print(":Result ends");
789: #my $td=&tv_interval($t0);
1.52 albertel 790: }
1.171 albertel 791: &Apache::lonxml::add_messages(\$overall_result);
792: $request->print($overall_result);
793: $request->rflush();
1.41 albertel 794: }
795:
1.42 albertel 796: # with no arg it returns a HTML <option> list of the template titles
797: # with one arg it returns the filename associated with the arg passed
798: sub get_template_list {
1.145 albertel 799: my ($namewanted,$extension) = @_;
800: my $result;
801: my @allnames;
802: &Apache::lonxml::debug("Looking for :$extension:");
803: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
804: my $name=&Apache::lonnet::metadata($file,'title');
805: if ($namewanted && ($name eq $namewanted)) {
806: $result=$file;
807: last;
808: } else {
809: if ($name) { push (@allnames, $name); }
810: }
811: }
812: if (@allnames && !$result) {
1.146 albertel 813: $result="<option>".&mt("Select a")." $extension ".&mt('template')."</option>\n<option>".
1.145 albertel 814: join('</option><option>',sort(@allnames)).'</option>';
1.42 albertel 815: }
1.145 albertel 816: return $result;
1.42 albertel 817: }
818:
819: sub newproblem {
1.65 matthew 820: my ($request) = @_;
821: my $extension=$request->uri;
822: $extension=~s:^.*\.([\w]+)$:$1:;
823: &Apache::lonxml::debug("Looking for :$extension:");
1.131 albertel 824: my $templatelist=&get_template_list('',$extension);
1.204 albertel 825: if ($env{'form.template'} &&
826: $env{'form.template'} ne "Select a $extension template") {
1.65 matthew 827: use File::Copy;
1.204 albertel 828: my $file = &get_template_list($env{'form.template'},$extension);
1.65 matthew 829: my $dest = &Apache::lonnet::filelocation("",$request->uri);
830: copy($file,$dest);
831: &renderpage($request,$dest);
1.204 albertel 832: } elsif($env{'form.newfile'} && !$templatelist) {
1.131 albertel 833: # I don't like hard-coded filenames but for now, this will work.
834: use File::Copy;
835: my $templatefilename =
836: $request->dir_config('lonIncludes').'/templates/blank.problem';
837: &Apache::lonxml::debug("$templatefilename");
838: my $dest = &Apache::lonnet::filelocation("",$request->uri);
839: copy($templatefilename,$dest);
840: &renderpage($request,$dest);
1.85 albertel 841: } else {
1.176 albertel 842: my $url=&HTML::Entities::encode($request->uri,'<>&"');
843: my $shownurl=$url;
1.157 albertel 844: $shownurl=~s-^/~-/priv/-;
1.65 matthew 845: my $dest = &Apache::lonnet::filelocation("",$request->uri);
1.128 albertel 846: my $errormsg;
1.204 albertel 847: if ($env{'form.newfile'}) {
1.146 albertel 848: $errormsg='<p><font color="red">'.&mt('You did not select a template.').'</font></p>'."\n";
1.128 albertel 849: }
1.85 albertel 850: my $instructions;
1.186 albertel 851: my $bodytag=&Apache::loncommon::bodytag(undef,undef,undef,
1.204 albertel 852: ($env{'environment.remote'} ne 'off'));
1.146 albertel 853: if ($templatelist) { $instructions=&mt(", select a template from the pull-down menu below.").'<br />'.&mt("Then");}
1.147 albertel 854: my %lt=&Apache::lonlocal::texthash( 'create' => 'Creating a new',
1.146 albertel 855: 'resource' => 'resource',
856: 'requested' => 'The requested file',
857: 'not exist' => 'currently does not exist',
858: 'createnew' => 'To create a new',
859: 'click' => 'click on the',
860: 'Create' => 'Create',
861: 'button' => 'button');
1.65 matthew 862: $request->print(<<ENDNEWPROBLEM);
1.159 www 863: $bodytag
1.148 albertel 864: <h1>$lt{'create'} $extension $lt{'resource'}</h1>
1.128 albertel 865: $errormsg
1.157 albertel 866: $lt{'requested'} <tt>$shownurl</tt> $lt{'not exist'}.
1.105 www 867: <p>
1.146 albertel 868: <b>$lt{'createnew'} $extension$instructions $lt{'click'} "$lt{'Create'} $extension" $lt{'button'}.</b>
1.105 www 869: </p>
870: <p><form action="$url" method="POST">
1.42 albertel 871: ENDNEWPROBLEM
1.85 albertel 872: if (defined($templatelist)) {
873: $request->print("<select name=\"template\">$templatelist</select>");
874: }
1.146 albertel 875: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"".&mt('Create')." $extension\" />");
1.105 www 876: $request->print("</form></p></body>");
1.65 matthew 877: }
878: return '';
1.42 albertel 879: }
880:
881: sub view_or_edit_menu {
1.145 albertel 882: my ($request) = @_;
1.176 albertel 883: my $url=&HTML::Entities::encode($request->uri,'<>&"');
1.147 albertel 884: my %lt=&Apache::lonlocal::texthash( 'would' => 'Would you like to',
1.146 albertel 885: 'view' => 'View',
886: 'Edit' => 'edit',
887: 'or' => 'or',
888: 'the problem' => 'the problem');
1.145 albertel 889: $request->print(<<EDITMENU);
1.42 albertel 890: <body bgcolor="#FFFFFF">
891: <form action="$url" method="POST">
1.170 matthew 892: $lt{'would'} <input type="submit" name="problemmode" accesskey="v" value="<{'view'}">
893: <{'or'} <input type="submit" name="problemmode" accesskey="e" value="<{'Edit'}">
1.146 albertel 894: <{'the problem'}.
1.42 albertel 895: </form>
896: </body>
897: EDITMENU
898: }
899:
1.41 albertel 900: sub handler {
1.145 albertel 901: #my $t0 = [&gettimeofday()];
902: my $request=$_[0];
903:
1.204 albertel 904: $Apache::lonxml::debug=$env{'user.debug'};
905: $env{'request.uri'}=$request->uri;
1.180 albertel 906: &setuppermissions();
1.145 albertel 907: # some times multiple problemmodes are submitted, need to select
908: # the last one
1.204 albertel 909: if ( defined($env{'form.problemmode'}) && ref($env{'form.problemmode'}) ) {
910: my $mode=$env{'form.problemmode'}->[-1];
911: undef $env{'form.problemmode'};
912: $env{'form.problemmode'}=$mode;
1.145 albertel 913: }
1.193 albertel 914:
1.145 albertel 915: my $file=&Apache::lonnet::filelocation("",$request->uri);
916:
917: #check if we know where we are
1.204 albertel 918: if ($env{'request.course.fn'} && !&Apache::lonnet::symbread()) {
1.145 albertel 919: # if we are browsing we might not be able to know where we are
1.173 albertel 920: if ($Apache::lonhomework::browse ne 'F' &&
1.204 albertel 921: $env{'request.state'} ne "construct") {
1.145 albertel 922: #should know where we are, so ask
923: if ( &Apache::lonnet::mod_perl_version() == 2 ) {
924: &Apache::lonnet::cleanenv();
925: }
1.190 albertel 926: &Apache::lonnet::logthis(&Apache::lonnet::mod_perl_version());
927: $request->internal_redirect('/adm/ambiguous'); return OK;
1.145 albertel 928: }
929: }
1.187 albertel 930: if (&setupheader($request)) { return OK; }
1.193 albertel 931: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
1.204 albertel 932: &Apache::lonxml::debug("Problem Mode ".$env{'form.problemmode'});
1.145 albertel 933: my ($symb) = &Apache::lonxml::whichuser();
934: &Apache::lonxml::debug('symb is '.$symb);
1.204 albertel 935: if ($env{'request.state'} eq "construct" || $symb eq '') {
936: if ($env{'form.resetdata'} eq &mt('Reset Submissions') ||
937: $env{'form.resetdata'} eq &mt('New Problem Variation') ||
938: $env{'form.newrandomization'} eq &mt('New Randomization')) {
1.145 albertel 939: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
940: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
941: &Apache::lonxml::debug("Attempt reset");
942: }
943: }
1.204 albertel 944: if ($env{'request.state'} eq "construct") {
1.145 albertel 945: if ( -e $file ) {
946: &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
947: ['problemmode']);
1.204 albertel 948: if (!(defined $env{'form.problemmode'})) {
1.145 albertel 949: #first visit to problem in construction space
950: #&view_or_edit_menu($request);
1.204 albertel 951: $env{'form.problemmode'}='View';
1.145 albertel 952: &renderpage($request,$file);
1.204 albertel 953: } elsif ($env{'form.problemmode'} eq &mt('EditXML') ||
954: $env{'form.problemmode'} eq 'EditXML') {
1.211 ! albertel 955: &renderpage($request,$file,['no_output_web']);
1.145 albertel 956: &editxmlmode($request,$file);
1.204 albertel 957: } elsif ($env{'form.problemmode'} eq &mt('Calculate answers')) {
1.145 albertel 958: &analyze($request,$file);
959: } else {
960: &renderpage($request,$file);
961: }
962: } else {
963: # requested file doesn't exist in contruction space
964: &newproblem($request);
965: }
966: } else {
967: # just render the page normally outside of construction space
968: &Apache::lonxml::debug("not construct");
1.52 albertel 969: &renderpage($request,$file);
1.41 albertel 970: }
1.145 albertel 971: #my $td=&tv_interval($t0);
972: #&Apache::lonxml::debug("Spent $td seconds processing");
973: # &Apache::lonhomework::send_footer($request);
974: # always turn off debug messages
975: $Apache::lonxml::debug=0;
976: return OK;
1.52 albertel 977:
1.1 albertel 978: }
979:
980: 1;
981: __END__
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