1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.129 2003/05/16 19:01:27 albertel 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: # Guy Albertelli
29: # 11/30 Gerd Kortemeyer
30: # 6/1,8/17,8/18 Gerd Kortemeyer
31: # 7/18 Jeremy Bowers
32:
33: package Apache::lonhomework;
34: use strict;
35: use Apache::style();
36: use Apache::lonxml();
37: use Apache::lonnet();
38: use Apache::lonplot();
39: use Apache::inputtags();
40: use Apache::structuretags();
41: use Apache::randomlabel();
42: use Apache::response();
43: use Apache::hint();
44: use Apache::outputtags();
45: use Apache::caparesponse();
46: use Apache::radiobuttonresponse();
47: use Apache::optionresponse();
48: use Apache::imageresponse();
49: use Apache::essayresponse();
50: use Apache::externalresponse();
51: use Apache::rankresponse();
52: use Apache::matchresponse();
53: #use Apache::chemresponse();
54: use Apache::Constants qw(:common);
55: use HTML::Entities();
56: use Apache::loncommon();
57: #use Time::HiRes qw( gettimeofday tv_interval );
58:
59: BEGIN {
60: &Apache::lonxml::register_insert();
61: }
62:
63: sub get_target {
64: if (($ENV{'request.state'} eq "published") ||
65: ($ENV{'request.state'} eq "uploaded")) {
66: if ( defined($ENV{'form.grade_target'} )
67: && ($ENV{'form.grade_target'} eq 'tex')) {
68: return ($ENV{'form.grade_target'});
69: } elsif ( defined($ENV{'form.grade_target'} )
70: && ($Apache::lonhomework::viewgrades eq 'F' )) {
71: return ($ENV{'form.grade_target'});
72: }
73:
74: if ( defined($ENV{'form.submitted'}) &&
75: ( !defined($ENV{'form.resetdata'}))) {
76: return ('grade', 'web');
77: } else {
78: return ('web');
79: }
80: } elsif ($ENV{'request.state'} eq "construct") {
81: if ( defined($ENV{'form.grade_target'}) ) {
82: return ($ENV{'form.grade_target'});
83: }
84: if ( defined($ENV{'form.preview'})) {
85: if ( defined($ENV{'form.submitted'})) {
86: return ('grade', 'web');
87: } else {
88: return ('web');
89: }
90: } else {
91: if ( $ENV{'form.problemmode'} eq 'View' ||
92: $ENV{'form.problemmode'} eq 'Discard Edits and View') {
93: if ( defined($ENV{'form.submitted'}) &&
94: (!defined($ENV{'form.resetdata'})) ) {
95: return ('grade', 'web','answer');
96: } else {
97: return ('web','answer');
98: }
99: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
100: if ( $ENV{'form.submitted'} eq 'edit' ) {
101: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
102: return ('modified','web','answer');
103: } else {
104: return ('modified','edit');
105: }
106: } else {
107: return ('edit');
108: }
109: } else {
110: return ('web');
111: }
112: }
113: }
114: return ();
115: }
116:
117: sub setup_vars {
118: my ($target) = @_;
119: return ';'
120: # return ';$external::target='.$target.';';
121: }
122:
123: sub send_header {
124: my ($request)= @_;
125: $request->print(&Apache::lontexconvert::header());
126: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
127: }
128:
129: sub createmenu {
130: my ($which,$request)=@_;
131: if ($which eq 'grade') {
132: $request->print('<script language="JavaScript">
133: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
134: "height=350,width=150,menubar=no");
135: </script>');
136: }
137: }
138:
139: sub send_footer {
140: my ($request)= @_;
141: # $request->print('</form>');
142: $request->print(&Apache::lontexconvert::footer());
143: }
144:
145: $Apache::lonxml::browse='';
146:
147: # JB, 9/24/2002: Any changes in this function may require a change
148: # in lonnavmaps::resource::getDateStatus.
149: sub check_access {
150: my ($id) = @_;
151: my $date ='';
152: my $status;
153: my $datemsg = '';
154: my $lastdate = '';
155: my $temp;
156: my $type;
157: my $passed;
158:
159: if ($ENV{'request.state'} eq "construct") {
160: &Apache::lonxml::debug("in construction ignoring dates");
161: $status='CAN_ANSWER';
162: $datemsg='is in under construction';
163: return ($status,$datemsg);
164: }
165:
166: &Apache::lonxml::debug("checking for part :$id:");
167: &Apache::lonxml::debug("time:".time);
168: foreach $temp ("opendate","duedate","answerdate") {
169: $lastdate = $date;
170: $date = &Apache::lonnet::EXT("resource.$id.$temp");
171: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
172: if ($thistype =~ /^(con_lost|no_such_host)/ ||
173: $date =~ /^(con_lost|no_such_host)/) {
174: $status='UNAVAILABLE';
175: $date="may open later.";
176: return($status,$date);
177: }
178: if ($thistype eq 'date_interval') {
179: if ($temp eq 'opendate') {
180: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
181: }
182: if ($temp eq 'answerdate') {
183: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
184: }
185: }
186: &Apache::lonxml::debug("found :$date: for :$temp:");
187: if ($date eq '') {
188: $date = "an unknown date"; $passed = 0;
189: } elsif ($date eq 'con_lost') {
190: $date = "an indeterminate date"; $passed = 0;
191: } else {
192: if (time < $date) { $passed = 0; } else { $passed = 1; }
193: $date = localtime $date;
194: }
195: if (!$passed) { $type=$temp; last; }
196: }
197: &Apache::lonxml::debug("have :$type:$passed:");
198: if ($passed) {
199: $status='SHOW_ANSWER';
200: $datemsg=$date;
201: } elsif ($type eq 'opendate') {
202: $status='CLOSED';
203: $datemsg = "will open on $date";
204: } elsif ($type eq 'duedate') {
205: $status='CAN_ANSWER';
206: $datemsg = "is due at $date";
207: } elsif ($type eq 'answerdate') {
208: $status='CLOSED';
209: $datemsg = "was due on $lastdate, and answers will be available on $date";
210: }
211: if ($status eq 'CAN_ANSWER') {
212: #check #tries, and if correct.
213: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
214: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
215: if ( $tries eq '' ) { $tries = '0'; }
216: if ( $maxtries eq '' ) { $maxtries = '2'; }
217: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
218: # if (correct and show prob status) or excused then CANNOT_ANSWER
219: if(($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
220: &&
221: lc($Apache::lonhomework::problemstatus) ne 'no')
222: ||
223: $Apache::lonhomework::history{"resource.$id.solved"}=~/^excused/) {
224: $status = 'CANNOT_ANSWER';
225: }
226: }
227:
228: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
229: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
230: return ('UNCHECKEDOUT','needs to be checked out');
231: }
232:
233:
234: &Apache::lonxml::debug("sending back :$status:$datemsg:");
235: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
236: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
237: $status='CAN_ANSWER';
238: $datemsg='is closed but you are allowed to view it';
239: }
240:
241: return ($status,$datemsg);
242: }
243:
244: sub showhash {
245: my (%hash) = @_;
246: &showhashsubset(\%hash,'.');
247: return '';
248: }
249:
250: sub showarray {
251: my ($array)=@_;
252: my $string="(";
253: foreach my $elm (@{ $array }) {
254: if (ref($elm)) {
255: if ($elm =~ /ARRAY/ ) {
256: $string.=&showarray($elm);
257: }
258: } else {
259: $string.="$elm,"
260: }
261: }
262: chop($string);
263: $string.=")";
264: return $string;
265: }
266:
267: sub showhashsubset {
268: my ($hash,$keyre) = @_;
269: my $resultkey;
270: foreach $resultkey (sort keys %$hash) {
271: if ($resultkey =~ /$keyre/) {
272: if (ref($$hash{$resultkey})) {
273: if ($$hash{$resultkey} =~ /ARRAY/ ) {
274: &Apache::lonxml::debug("$resultkey ---- ".
275: &showarray($$hash{$resultkey}));
276: } elsif ($$hash{$resultkey} =~ /HASH/ ) {
277: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
278: &showhashsubset($$hash{$resultkey},'.');
279: } else {
280: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
281: }
282: } else {
283: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
284: }
285: }
286: }
287: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
288: return '';
289: }
290:
291: sub setuppermissions {
292: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
293: my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
294: if (! $viewgrades &&
295: exists($ENV{'request.course.sec'}) &&
296: $ENV{'request.course.sec'} !~ /^\s*$/) {
297: $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
298: '/'.$ENV{'request.course.sec'});
299: }
300: $Apache::lonhomework::viewgrades = $viewgrades;
301: return ''
302: }
303:
304: sub setupheader {
305: my $request=$_[0];
306: if ($ENV{'browser.mathml'}) {
307: $request->content_type('text/xml');
308: } else {
309: $request->content_type('text/html');
310: }
311: $request->content_encoding('UTF-8');
312: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
313: &Apache::loncommon::no_cache($request);
314: }
315: $request->send_http_header;
316: return OK if $request->header_only;
317: return ''
318: }
319:
320: sub handle_save_or_undo {
321: my ($request,$problem,$result) = @_;
322: my $file = &Apache::lonnet::filelocation("",$request->uri);
323: my $filebak =$file.".bak";
324: my $filetmp =$file.".tmp";
325: my $error=0;
326:
327: if ($ENV{'form.Undo'} eq 'undo') {
328: my $error=0;
329: if (!copy($file,$filetmp)) { $error=1; }
330: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
331: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
332: if (!$error) {
333: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
334: } else {
335: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
336: $error=1;
337: }
338: } else {
339: my $fs=Apache::File->new(">$filebak");
340: if (defined($fs)) {
341: print $fs $$problem;
342: $request->print("<b>Making Backup to $filebak</b><br />");
343: } else {
344: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
345: $error=2;
346: }
347: my $fh=Apache::File->new(">$file");
348: if (defined($fh)) {
349: print $fh $$result;
350: $request->print("<b>Saving Modifications to $file</b><br />");
351: } else {
352: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
353: $error|=4;
354: }
355: }
356: return $error;
357: }
358:
359: sub analyze_header {
360: my ($request) = @_;
361: my $result.='<html>
362: <head><title>Analyzing a problem</title></head>
363: <body bgcolor="#FFFFFF">
364: <form name="lonhomework" method="POST" action="'.
365: $ENV{'request.uri'}.'">
366: <input type="submit" name="problemmode" value="EditXML" />
367: <input type="submit" name="problemmode" value="Edit" />
368: <hr />
369: <input type="submit" name="submit" value="View" />
370: <hr />
371: List of possible answers:
372: </form>';
373: $request->print($result);
374: $request->rflush();
375: }
376:
377: sub analyze_footer {
378: my ($request) = @_;
379: my $result='</body></html>';
380: $request->print($result);
381: $request->rflush();
382: }
383:
384: sub analyze {
385: my ($request,$file) = @_;
386: &Apache::lonxml::debug("Analyze");
387: my $result;
388: my %overall;
389: my %allparts;
390: my $rndseed=$ENV{'form.rndseed'};
391: &analyze_header($request);
392: my %prog_state=
393: &Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
394: 'Getting Problem Variants',
395: $ENV{'form.numtoanalyze'});
396: for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
397: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
398: 'last problem');
399: my $subresult=&Apache::lonnet::ssi($request->uri,
400: ('grade_target' => 'analyze'),
401: ('rndseed' => $i));
402: &Apache::lonxml::debug(":$subresult:");
403: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
404: my %analyze=&Apache::lonnet::str2hash($subresult);
405: my @parts;
406: if (defined(@{ $analyze{'parts'} })) {
407: @parts=@{ $analyze{'parts'} };
408: }
409: foreach my $part (@parts) {
410: if (!exists($allparts{$part})) {$allparts{$part}=1;};
411: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
412: $analyze{$part.'.type'} eq 'stringresponse' ||
413: $analyze{$part.'.type'} eq 'formularesponse' ) {
414: push( @{ $overall{$part.'.answer'} },
415: [@{ $analyze{$part.'.answer'} }]);
416: }
417: }
418: }
419: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
420: 'Analyzing Results');
421: foreach my $part (keys(%allparts)) {
422: if (defined(@{ $overall{$part.'.answer'} })) {
423: $request->print('<table><tr><td>Part '.$part.'</td></tr>');
424: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
425: $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
426: '</td></tr>');
427: }
428: $request->print('</table>');
429: } else {
430: $request->print('<p>Part '.$part.
431: ' is not analyzabale at this time</p>');
432: }
433: }
434: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
435: &analyze_footer($request);
436: &Apache::lonhomework::showhash(%overall);
437: return $result;
438: }
439:
440: sub editxmlmode {
441: my ($request,$file) = @_;
442: my $result;
443: my $problem=&Apache::lonnet::getfile($file);
444: if ($problem eq -1) {
445: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
446: $problem='';
447: }
448: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
449: my $error=&handle_save_or_undo($request,\$problem,
450: \$ENV{'form.editxmltext'});
451: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
452: }
453: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
454: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
455: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
456: $ENV{'form.problemmode'}='View';
457: &renderpage($request,$file);
458: } else {
459: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
460: my $xml_help = '<table><tr><td>'.
461: &Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
462: .'</td><td>'.
463: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
464: undef,undef,600)
465: .'</td><td>'.
466: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
467: undef,undef,600)
468: .'</td></tr></table>';
469: if ($cols > 80) { $cols = 80; }
470: if ($cols < 70) { $cols = 70; }
471: if ($rows < 20) { $rows = 20; }
472: $result.='<html><body bgcolor="#FFFFFF">
473: <form name="lonhomework" method="POST" action="'.
474: $ENV{'request.uri'}.'">
475: <input type="hidden" name="problemmode" value="EditXML" />
476: <input type="submit" name="problemmode" value="Discard Edits and View" />
477: <input type="submit" name="problemmode" value="Edit" />
478: <hr />
479: <input type="submit" name="submit" value="Submit Changes" />
480: <input type="submit" name="submit" value="Submit Changes and View" />
481: <input type="submit" name="Undo" value="undo" />
482: <hr />
483: ' . $xml_help . '
484: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
485: &HTML::Entities::encode($problem).'</textarea>
486: </form></body></html>';
487: $request->print($result);
488: }
489: return '';
490: }
491:
492: sub renderpage {
493: my ($request,$file) = @_;
494:
495: my (@targets) = &get_target();
496: &Apache::lonxml::debug("Running targets ".join(':',@targets));
497: foreach my $target (@targets) {
498: #my $t0 = [&gettimeofday()];
499: my $problem=&Apache::lonnet::getfile($file);
500: if ($problem eq -1) {
501: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
502: $problem='';
503: }
504:
505: my %mystyle;
506: my $result = '';
507: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
508: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
509: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
510:
511: &Apache::lonxml::debug("Should be parsing now");
512: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
513: &setup_vars($target),%mystyle);
514: undef($Apache::lonhomework::parsing_a_problem);
515: #$request->print("Result follows:");
516: if ($target eq 'modified') {
517: &handle_save_or_undo($request,\$problem,\$result);
518: } else {
519: if ($target eq 'analyze') {
520: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
521: undef(%Apache::lonhomework::analyze);
522: }
523: #my $td=&tv_interval($t0);
524: #if ( $Apache::lonxml::debug) {
525: #$result =~ s:</body>::;
526: #$result.="<br />Spent $td seconds processing target $target\n</body>";
527: #}
528: $request->print($result);
529: $request->rflush();
530: }
531: #$request->print(":Result ends");
532: #my $td=&tv_interval($t0);
533: }
534: }
535:
536: # with no arg it returns a HTML <option> list of the template titles
537: # with one arg it returns the filename associated with the arg passed
538: sub get_template_list {
539: my ($namewanted,$extension) = @_;
540: my $result;
541: my @allnames;
542: &Apache::lonxml::debug("Looking for :$extension:");
543: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
544: my $name=&Apache::lonnet::metadata($file,'title');
545: if ($namewanted && ($name eq $namewanted)) {
546: $result=$file;
547: last;
548: } else {
549: if ($name) { push (@allnames, $name); }
550: }
551: }
552: if (@allnames && !$result) {
553: $result="<option>Select a $extension template</option>\n<option>".
554: join('</option><option>',sort(@allnames)).'</option>';
555: }
556: return $result;
557: }
558:
559: sub newproblem {
560: my ($request) = @_;
561: my $extension=$request->uri;
562: $extension=~s:^.*\.([\w]+)$:$1:;
563: &Apache::lonxml::debug("Looking for :$extension:");
564: if ($ENV{'form.template'} &&
565: $ENV{'form.template'} ne "Select a $extension template") {
566: use File::Copy;
567: my $file = &get_template_list($ENV{'form.template'},$extension);
568: my $dest = &Apache::lonnet::filelocation("",$request->uri);
569: copy($file,$dest);
570: &renderpage($request,$dest);
571: } else {
572: my $templatelist=&get_template_list('',$extension);
573: my $url=$request->uri;
574: my $dest = &Apache::lonnet::filelocation("",$request->uri);
575: my $errormsg;
576: if ($ENV{'form.newfile'}) {
577: $errormsg='<p><font color="red">You did not select a template.</font></p>'."\n";
578: }
579: my $instructions;
580: if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
581: $request->print(<<ENDNEWPROBLEM);
582: <body bgcolor="#FFFFFF">
583: <h1>Creating a new $extension resource</h1>
584: $errormsg
585: The requested file <tt>$url</tt> currently does not exist.
586: <p>
587: <b>To create a new $extension$instructions click on the "Create $extension" button.</b>
588: </p>
589: <p><form action="$url" method="POST">
590: ENDNEWPROBLEM
591: if (defined($templatelist)) {
592: $request->print("<select name=\"template\">$templatelist</select>");
593: }
594: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
595: $request->print("</form></p></body>");
596: }
597: return '';
598: }
599:
600: sub view_or_edit_menu {
601: my ($request) = @_;
602: my $url=$request->uri;
603: $request->print(<<EDITMENU);
604: <body bgcolor="#FFFFFF">
605: <form action="$url" method="POST">
606: Would you like to <input type="submit" name="problemmode" value="View"> or
607: <input type="submit" name="problemmode" value="Edit"> the problem.
608: </form>
609: </body>
610: EDITMENU
611: }
612:
613: sub handler {
614: #my $t0 = [&gettimeofday()];
615: my $request=$_[0];
616:
617: $Apache::lonxml::debug=$ENV{'user.debug'};
618:
619: if (&setupheader($request)) { return OK; }
620: $ENV{'request.uri'}=$request->uri;
621:
622: #setup permissions
623: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
624: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
625: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
626: # some times multiple problemmodes are submitted, need to select
627: # the last one
628: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
629: if ( defined($ENV{'form.problemmode'}) &&
630: ref($ENV{'form.problemmode'}) ) {
631: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
632: my $mode=$ENV{'form.problemmode'}->[-1];
633: undef $ENV{'form.problemmode'};
634: $ENV{'form.problemmode'}=$mode;
635: }
636: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
637: my $file=&Apache::lonnet::filelocation("",$request->uri);
638:
639: #check if we know where we are
640: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
641: # if we are browsing we might not be able to know where we are
642: if ($Apache::lonhomework::browse ne 'F') {
643: #should know where we are, so ask
644: $request->internal_redirect('/adm/ambiguous'); return;
645: }
646: }
647:
648: my ($symb) = &Apache::lonxml::whichuser();
649: &Apache::lonxml::debug('symb is '.$symb);
650: if ($ENV{'request.state'} eq "construct" || $symb eq '') {
651: if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
652: $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
653: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
654: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
655: }
656: }
657: if ($ENV{'request.state'} eq "construct") {
658: if ( -e $file ) {
659: if (!(defined $ENV{'form.problemmode'})) {
660: #first visit to problem in construction space
661: #&view_or_edit_menu($request);
662: $ENV{'form.problemmode'}='View';
663: &renderpage($request,$file);
664: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
665: &editxmlmode($request,$file);
666: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
667: &analyze($request,$file);
668: } else {
669: &renderpage($request,$file);
670: }
671: } else {
672: # requested file doesn't exist in contruction space
673: &newproblem($request);
674: }
675: } else {
676: # just render the page normally outside of construction space
677: &Apache::lonxml::debug("not construct");
678: &renderpage($request,$file);
679: }
680: #my $td=&tv_interval($t0);
681: #&Apache::lonxml::debug("Spent $td seconds processing");
682: # &Apache::lonhomework::send_footer($request);
683: # always turn off debug messages
684: $Apache::lonxml::debug=0;
685: return OK;
686:
687: }
688:
689: 1;
690: __END__
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