1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.128 2003/05/16 17:41:17 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) { $status = 'CANNOT_ANSWER'; }
218: if($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
219: && lc($Apache::lonhomework::problemstatus) ne 'no') {
220: $status = 'CANNOT_ANSWER';
221: }
222: }
223:
224: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
225: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
226: return ('UNCHECKEDOUT','needs to be checked out');
227: }
228:
229:
230: &Apache::lonxml::debug("sending back :$status:$datemsg:");
231: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
232: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
233: $status='CAN_ANSWER';
234: $datemsg='is closed but you are allowed to view it';
235: }
236:
237: return ($status,$datemsg);
238: }
239:
240: sub showhash {
241: my (%hash) = @_;
242: &showhashsubset(\%hash,'.');
243: return '';
244: }
245:
246: sub showarray {
247: my ($array)=@_;
248: my $string="(";
249: foreach my $elm (@{ $array }) {
250: if (ref($elm)) {
251: if ($elm =~ /ARRAY/ ) {
252: $string.=&showarray($elm);
253: }
254: } else {
255: $string.="$elm,"
256: }
257: }
258: chop($string);
259: $string.=")";
260: return $string;
261: }
262:
263: sub showhashsubset {
264: my ($hash,$keyre) = @_;
265: my $resultkey;
266: foreach $resultkey (sort keys %$hash) {
267: if ($resultkey =~ /$keyre/) {
268: if (ref($$hash{$resultkey})) {
269: if ($$hash{$resultkey} =~ /ARRAY/ ) {
270: &Apache::lonxml::debug("$resultkey ---- ".
271: &showarray($$hash{$resultkey}));
272: } elsif ($$hash{$resultkey} =~ /HASH/ ) {
273: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
274: &showhashsubset($$hash{$resultkey},'.');
275: } else {
276: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
277: }
278: } else {
279: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
280: }
281: }
282: }
283: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
284: return '';
285: }
286:
287: sub setuppermissions {
288: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
289: my $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
290: if (! $viewgrades &&
291: exists($ENV{'request.course.sec'}) &&
292: $ENV{'request.course.sec'} !~ /^\s*$/) {
293: $viewgrades = &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'}.
294: '/'.$ENV{'request.course.sec'});
295: }
296: $Apache::lonhomework::viewgrades = $viewgrades;
297: return ''
298: }
299:
300: sub setupheader {
301: my $request=$_[0];
302: if ($ENV{'browser.mathml'}) {
303: $request->content_type('text/xml');
304: } else {
305: $request->content_type('text/html');
306: }
307: $request->content_encoding('UTF-8');
308: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
309: &Apache::loncommon::no_cache($request);
310: }
311: $request->send_http_header;
312: return OK if $request->header_only;
313: return ''
314: }
315:
316: sub handle_save_or_undo {
317: my ($request,$problem,$result) = @_;
318: my $file = &Apache::lonnet::filelocation("",$request->uri);
319: my $filebak =$file.".bak";
320: my $filetmp =$file.".tmp";
321: my $error=0;
322:
323: if ($ENV{'form.Undo'} eq 'undo') {
324: my $error=0;
325: if (!copy($file,$filetmp)) { $error=1; }
326: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
327: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
328: if (!$error) {
329: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
330: } else {
331: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
332: $error=1;
333: }
334: } else {
335: my $fs=Apache::File->new(">$filebak");
336: if (defined($fs)) {
337: print $fs $$problem;
338: $request->print("<b>Making Backup to $filebak</b><br />");
339: } else {
340: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
341: $error=2;
342: }
343: my $fh=Apache::File->new(">$file");
344: if (defined($fh)) {
345: print $fh $$result;
346: $request->print("<b>Saving Modifications to $file</b><br />");
347: } else {
348: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
349: $error|=4;
350: }
351: }
352: return $error;
353: }
354:
355: sub analyze_header {
356: my ($request) = @_;
357: my $result.='<html>
358: <head><title>Analyzing a problem</title></head>
359: <body bgcolor="#FFFFFF">
360: <form name="lonhomework" method="POST" action="'.
361: $ENV{'request.uri'}.'">
362: <input type="submit" name="problemmode" value="EditXML" />
363: <input type="submit" name="problemmode" value="Edit" />
364: <hr />
365: <input type="submit" name="submit" value="View" />
366: <hr />
367: List of possible answers:
368: </form>';
369: $request->print($result);
370: $request->rflush();
371: }
372:
373: sub analyze_footer {
374: my ($request) = @_;
375: my $result='</body></html>';
376: $request->print($result);
377: $request->rflush();
378: }
379:
380: sub analyze {
381: my ($request,$file) = @_;
382: &Apache::lonxml::debug("Analyze");
383: my $result;
384: my %overall;
385: my %allparts;
386: my $rndseed=$ENV{'form.rndseed'};
387: &analyze_header($request);
388: my %prog_state=
389: &Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
390: 'Getting Problem Variants',
391: $ENV{'form.numtoanalyze'});
392: for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
393: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
394: 'last problem');
395: my $subresult=&Apache::lonnet::ssi($request->uri,
396: ('grade_target' => 'analyze'),
397: ('rndseed' => $i));
398: &Apache::lonxml::debug(":$subresult:");
399: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
400: my %analyze=&Apache::lonnet::str2hash($subresult);
401: my @parts;
402: if (defined(@{ $analyze{'parts'} })) {
403: @parts=@{ $analyze{'parts'} };
404: }
405: foreach my $part (@parts) {
406: if (!exists($allparts{$part})) {$allparts{$part}=1;};
407: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
408: $analyze{$part.'.type'} eq 'stringresponse' ||
409: $analyze{$part.'.type'} eq 'formularesponse' ) {
410: push( @{ $overall{$part.'.answer'} },
411: [@{ $analyze{$part.'.answer'} }]);
412: }
413: }
414: }
415: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
416: 'Analyzing Results');
417: foreach my $part (keys(%allparts)) {
418: if (defined(@{ $overall{$part.'.answer'} })) {
419: $request->print('<table><tr><td>Part '.$part.'</td></tr>');
420: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
421: $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
422: '</td></tr>');
423: }
424: $request->print('</table>');
425: } else {
426: $request->print('<p>Part '.$part.
427: ' is not analyzabale at this time</p>');
428: }
429: }
430: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
431: &analyze_footer($request);
432: &Apache::lonhomework::showhash(%overall);
433: return $result;
434: }
435:
436: sub editxmlmode {
437: my ($request,$file) = @_;
438: my $result;
439: my $problem=&Apache::lonnet::getfile($file);
440: if ($problem eq -1) {
441: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
442: $problem='';
443: }
444: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
445: my $error=&handle_save_or_undo($request,\$problem,
446: \$ENV{'form.editxmltext'});
447: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
448: }
449: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
450: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
451: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
452: $ENV{'form.problemmode'}='View';
453: &renderpage($request,$file);
454: } else {
455: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
456: my $xml_help = '<table><tr><td>'.
457: &Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
458: .'</td><td>'.
459: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
460: undef,undef,600)
461: .'</td><td>'.
462: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
463: undef,undef,600)
464: .'</td></tr></table>';
465: if ($cols > 80) { $cols = 80; }
466: if ($cols < 70) { $cols = 70; }
467: if ($rows < 20) { $rows = 20; }
468: $result.='<html><body bgcolor="#FFFFFF">
469: <form name="lonhomework" method="POST" action="'.
470: $ENV{'request.uri'}.'">
471: <input type="hidden" name="problemmode" value="EditXML" />
472: <input type="submit" name="problemmode" value="Discard Edits and View" />
473: <input type="submit" name="problemmode" value="Edit" />
474: <hr />
475: <input type="submit" name="submit" value="Submit Changes" />
476: <input type="submit" name="submit" value="Submit Changes and View" />
477: <input type="submit" name="Undo" value="undo" />
478: <hr />
479: ' . $xml_help . '
480: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
481: &HTML::Entities::encode($problem).'</textarea>
482: </form></body></html>';
483: $request->print($result);
484: }
485: return '';
486: }
487:
488: sub renderpage {
489: my ($request,$file) = @_;
490:
491: my (@targets) = &get_target();
492: &Apache::lonxml::debug("Running targets ".join(':',@targets));
493: foreach my $target (@targets) {
494: #my $t0 = [&gettimeofday()];
495: my $problem=&Apache::lonnet::getfile($file);
496: if ($problem eq -1) {
497: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
498: $problem='';
499: }
500:
501: my %mystyle;
502: my $result = '';
503: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
504: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
505: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
506:
507: &Apache::lonxml::debug("Should be parsing now");
508: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
509: &setup_vars($target),%mystyle);
510: undef($Apache::lonhomework::parsing_a_problem);
511: #$request->print("Result follows:");
512: if ($target eq 'modified') {
513: &handle_save_or_undo($request,\$problem,\$result);
514: } else {
515: if ($target eq 'analyze') {
516: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
517: undef(%Apache::lonhomework::analyze);
518: }
519: #my $td=&tv_interval($t0);
520: #if ( $Apache::lonxml::debug) {
521: #$result =~ s:</body>::;
522: #$result.="<br />Spent $td seconds processing target $target\n</body>";
523: #}
524: $request->print($result);
525: $request->rflush();
526: }
527: #$request->print(":Result ends");
528: #my $td=&tv_interval($t0);
529: }
530: }
531:
532: # with no arg it returns a HTML <option> list of the template titles
533: # with one arg it returns the filename associated with the arg passed
534: sub get_template_list {
535: my ($namewanted,$extension) = @_;
536: my $result;
537: my @allnames;
538: &Apache::lonxml::debug("Looking for :$extension:");
539: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
540: my $name=&Apache::lonnet::metadata($file,'title');
541: if ($namewanted && ($name eq $namewanted)) {
542: $result=$file;
543: last;
544: } else {
545: if ($name) { push (@allnames, $name); }
546: }
547: }
548: if (@allnames && !$result) {
549: $result="<option>Select a $extension template</option>\n<option>".
550: join('</option><option>',sort(@allnames)).'</option>';
551: }
552: return $result;
553: }
554:
555: sub newproblem {
556: my ($request) = @_;
557: my $extension=$request->uri;
558: $extension=~s:^.*\.([\w]+)$:$1:;
559: &Apache::lonxml::debug("Looking for :$extension:");
560: if ($ENV{'form.template'} &&
561: $ENV{'form.template'} ne "Select a $extension template") {
562: use File::Copy;
563: my $file = &get_template_list($ENV{'form.template'},$extension);
564: my $dest = &Apache::lonnet::filelocation("",$request->uri);
565: copy($file,$dest);
566: &renderpage($request,$dest);
567: } else {
568: my $templatelist=&get_template_list('',$extension);
569: my $url=$request->uri;
570: my $dest = &Apache::lonnet::filelocation("",$request->uri);
571: my $errormsg;
572: if ($ENV{'form.newfile'}) {
573: $errormsg='<p><font color="red">You did not select a template.</font></p>'."\n";
574: }
575: my $instructions;
576: if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
577: $request->print(<<ENDNEWPROBLEM);
578: <body bgcolor="#FFFFFF">
579: <h1>Creating a new $extension resource</h1>
580: $errormsg
581: The requested file <tt>$url</tt> currently does not exist.
582: <p>
583: <b>To create a new $extension$instructions click on the "Create $extension" button.</b>
584: </p>
585: <p><form action="$url" method="POST">
586: ENDNEWPROBLEM
587: if (defined($templatelist)) {
588: $request->print("<select name=\"template\">$templatelist</select>");
589: }
590: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
591: $request->print("</form></p></body>");
592: }
593: return '';
594: }
595:
596: sub view_or_edit_menu {
597: my ($request) = @_;
598: my $url=$request->uri;
599: $request->print(<<EDITMENU);
600: <body bgcolor="#FFFFFF">
601: <form action="$url" method="POST">
602: Would you like to <input type="submit" name="problemmode" value="View"> or
603: <input type="submit" name="problemmode" value="Edit"> the problem.
604: </form>
605: </body>
606: EDITMENU
607: }
608:
609: sub handler {
610: #my $t0 = [&gettimeofday()];
611: my $request=$_[0];
612:
613: $Apache::lonxml::debug=$ENV{'user.debug'};
614:
615: if (&setupheader($request)) { return OK; }
616: $ENV{'request.uri'}=$request->uri;
617:
618: #setup permissions
619: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
620: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
621: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
622: # some times multiple problemmodes are submitted, need to select
623: # the last one
624: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
625: if ( defined($ENV{'form.problemmode'}) &&
626: ref($ENV{'form.problemmode'}) ) {
627: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
628: my $mode=$ENV{'form.problemmode'}->[-1];
629: undef $ENV{'form.problemmode'};
630: $ENV{'form.problemmode'}=$mode;
631: }
632: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
633: my $file=&Apache::lonnet::filelocation("",$request->uri);
634:
635: #check if we know where we are
636: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
637: # if we are browsing we might not be able to know where we are
638: if ($Apache::lonhomework::browse ne 'F') {
639: #should know where we are, so ask
640: $request->internal_redirect('/adm/ambiguous'); return;
641: }
642: }
643:
644: my ($symb) = &Apache::lonxml::whichuser();
645: &Apache::lonxml::debug('symb is '.$symb);
646: if ($ENV{'request.state'} eq "construct" || $symb eq '') {
647: if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
648: $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
649: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
650: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
651: }
652: }
653: if ($ENV{'request.state'} eq "construct") {
654: if ( -e $file ) {
655: if (!(defined $ENV{'form.problemmode'})) {
656: #first visit to problem in construction space
657: #&view_or_edit_menu($request);
658: $ENV{'form.problemmode'}='View';
659: &renderpage($request,$file);
660: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
661: &editxmlmode($request,$file);
662: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
663: &analyze($request,$file);
664: } else {
665: &renderpage($request,$file);
666: }
667: } else {
668: # requested file doesn't exist in contruction space
669: &newproblem($request);
670: }
671: } else {
672: # just render the page normally outside of construction space
673: &Apache::lonxml::debug("not construct");
674: &renderpage($request,$file);
675: }
676: #my $td=&tv_interval($t0);
677: #&Apache::lonxml::debug("Spent $td seconds processing");
678: # &Apache::lonhomework::send_footer($request);
679: # always turn off debug messages
680: $Apache::lonxml::debug=0;
681: return OK;
682:
683: }
684:
685: 1;
686: __END__
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