1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.125 2003/05/13 01:18:37 www 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 ($ENV{'request.state'} eq "published") {
65: if ( defined($ENV{'form.grade_target'} )
66: && ($ENV{'form.grade_target'} eq 'tex')) {
67: return ($ENV{'form.grade_target'});
68: } elsif ( defined($ENV{'form.grade_target'} )
69: && ($Apache::lonhomework::viewgrades eq 'F' )) {
70: return ($ENV{'form.grade_target'});
71: }
72:
73: if ( defined($ENV{'form.submitted'}) &&
74: ( !defined($ENV{'form.resetdata'}))) {
75: return ('grade', 'web');
76: } else {
77: return ('web');
78: }
79: } elsif ($ENV{'request.state'} eq "construct") {
80: if ( defined($ENV{'form.grade_target'}) ) {
81: return ($ENV{'form.grade_target'});
82: }
83: if ( defined($ENV{'form.preview'})) {
84: if ( defined($ENV{'form.submitted'})) {
85: return ('grade', 'web');
86: } else {
87: return ('web');
88: }
89: } else {
90: if ( $ENV{'form.problemmode'} eq 'View' ||
91: $ENV{'form.problemmode'} eq 'Discard Edits and View') {
92: if ( defined($ENV{'form.submitted'}) &&
93: (!defined($ENV{'form.resetdata'})) ) {
94: return ('grade', 'web','answer');
95: } else {
96: return ('web','answer');
97: }
98: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
99: if ( $ENV{'form.submitted'} eq 'edit' ) {
100: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
101: return ('modified','web','answer');
102: } else {
103: return ('modified','edit');
104: }
105: } else {
106: return ('edit');
107: }
108: } else {
109: return ('web');
110: }
111: }
112: }
113: return ();
114: }
115:
116: sub setup_vars {
117: my ($target) = @_;
118: return ';'
119: # return ';$external::target='.$target.';';
120: }
121:
122: sub send_header {
123: my ($request)= @_;
124: $request->print(&Apache::lontexconvert::header());
125: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
126: }
127:
128: sub createmenu {
129: my ($which,$request)=@_;
130: if ($which eq 'grade') {
131: $request->print('<script language="JavaScript">
132: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
133: "height=350,width=150,menubar=no");
134: </script>');
135: }
136: }
137:
138: sub send_footer {
139: my ($request)= @_;
140: # $request->print('</form>');
141: $request->print(&Apache::lontexconvert::footer());
142: }
143:
144: $Apache::lonxml::browse='';
145:
146: # JB, 9/24/2002: Any changes in this function may require a change
147: # in lonnavmaps::resource::getDateStatus.
148: sub check_access {
149: my ($id) = @_;
150: my $date ='';
151: my $status;
152: my $datemsg = '';
153: my $lastdate = '';
154: my $temp;
155: my $type;
156: my $passed;
157:
158: if ($ENV{'request.state'} eq "construct") {
159: &Apache::lonxml::debug("in construction ignoring dates");
160: $status='CAN_ANSWER';
161: $datemsg='is in under construction';
162: return ($status,$datemsg);
163: }
164:
165: &Apache::lonxml::debug("checking for part :$id:");
166: &Apache::lonxml::debug("time:".time);
167: foreach $temp ("opendate","duedate","answerdate") {
168: $lastdate = $date;
169: $date = &Apache::lonnet::EXT("resource.$id.$temp");
170: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
171: if ($thistype =~ /^(con_lost|no_such_host)/ ||
172: $date =~ /^(con_lost|no_such_host)/) {
173: $status='UNAVAILABLE';
174: $date="may open later.";
175: return($status,$date);
176: }
177: if ($thistype eq 'date_interval') {
178: if ($temp eq 'opendate') {
179: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
180: }
181: if ($temp eq 'answerdate') {
182: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
183: }
184: }
185: &Apache::lonxml::debug("found :$date: for :$temp:");
186: if ($date eq '') {
187: $date = "an unknown date"; $passed = 0;
188: } elsif ($date eq 'con_lost') {
189: $date = "an indeterminate date"; $passed = 0;
190: } else {
191: if (time < $date) { $passed = 0; } else { $passed = 1; }
192: $date = localtime $date;
193: }
194: if (!$passed) { $type=$temp; last; }
195: }
196: &Apache::lonxml::debug("have :$type:$passed:");
197: if ($passed) {
198: $status='SHOW_ANSWER';
199: $datemsg=$date;
200: } elsif ($type eq 'opendate') {
201: $status='CLOSED';
202: $datemsg = "will open on $date";
203: } elsif ($type eq 'duedate') {
204: $status='CAN_ANSWER';
205: $datemsg = "is due at $date";
206: } elsif ($type eq 'answerdate') {
207: $status='CLOSED';
208: $datemsg = "was due on $lastdate, and answers will be available on $date";
209: }
210: if ($status eq 'CAN_ANSWER') {
211: #check #tries, and if correct.
212: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
213: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
214: if ( $tries eq '' ) { $tries = '0'; }
215: if ( $maxtries eq '' ) { $maxtries = '2'; }
216: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
217: if($Apache::lonhomework::history{"resource.$id.solved"}=~/^correct/
218: && lc($Apache::lonhomework::problemstatus) ne 'no') {
219: $status = 'CANNOT_ANSWER';
220: }
221: }
222:
223: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
224: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
225: return ('UNCHECKEDOUT','needs to be checked out');
226: }
227:
228:
229: &Apache::lonxml::debug("sending back :$status:$datemsg:");
230: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
231: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
232: $status='CAN_ANSWER';
233: $datemsg='is closed but you are allowed to view it';
234: }
235:
236: return ($status,$datemsg);
237: }
238:
239: sub showhash {
240: my (%hash) = @_;
241: &showhashsubset(\%hash,'.');
242: return '';
243: }
244:
245: sub showarray {
246: my ($array)=@_;
247: my $string="(";
248: foreach my $elm (@{ $array }) {
249: if (ref($elm)) {
250: if ($elm =~ /ARRAY/ ) {
251: $string.=&showarray($elm);
252: }
253: } else {
254: $string.="$elm,"
255: }
256: }
257: chop($string);
258: $string.=")";
259: return $string;
260: }
261:
262: sub showhashsubset {
263: my ($hash,$keyre) = @_;
264: my $resultkey;
265: foreach $resultkey (sort keys %$hash) {
266: if ($resultkey =~ /$keyre/) {
267: if (ref($$hash{$resultkey})) {
268: if ($$hash{$resultkey} =~ /ARRAY/ ) {
269: &Apache::lonxml::debug("$resultkey ---- ".
270: &showarray($$hash{$resultkey}));
271: } elsif ($$hash{$resultkey} =~ /HASH/ ) {
272: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
273: &showhashsubset($$hash{$resultkey},'.');
274: } else {
275: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
276: }
277: } else {
278: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
279: }
280: }
281: }
282: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
283: return '';
284: }
285:
286: sub setuppermissions {
287: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
288: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
289: return ''
290: }
291:
292: sub setupheader {
293: my $request=$_[0];
294: if ($ENV{'browser.mathml'}) {
295: $request->content_type('text/xml');
296: } else {
297: $request->content_type('text/html');
298: }
299: $request->content_encoding('UTF-8');
300: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
301: &Apache::loncommon::no_cache($request);
302: }
303: $request->send_http_header;
304: return OK if $request->header_only;
305: return ''
306: }
307:
308: sub handle_save_or_undo {
309: my ($request,$problem,$result) = @_;
310: my $file = &Apache::lonnet::filelocation("",$request->uri);
311: my $filebak =$file.".bak";
312: my $filetmp =$file.".tmp";
313: my $error=0;
314:
315: if ($ENV{'form.Undo'} eq 'undo') {
316: my $error=0;
317: if (!copy($file,$filetmp)) { $error=1; }
318: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
319: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
320: if (!$error) {
321: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
322: } else {
323: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
324: $error=1;
325: }
326: } else {
327: my $fs=Apache::File->new(">$filebak");
328: if (defined($fs)) {
329: print $fs $$problem;
330: $request->print("<b>Making Backup to $filebak</b><br />");
331: } else {
332: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
333: $error=2;
334: }
335: my $fh=Apache::File->new(">$file");
336: if (defined($fh)) {
337: print $fh $$result;
338: $request->print("<b>Saving Modifications to $file</b><br />");
339: } else {
340: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
341: $error|=4;
342: }
343: }
344: return $error;
345: }
346:
347: sub analyze_header {
348: my ($request) = @_;
349: my $result.='<html>
350: <head><title>Analyzing a problem</title></head>
351: <body bgcolor="#FFFFFF">
352: <form name="lonhomework" method="POST" action="'.
353: $ENV{'request.uri'}.'">
354: <input type="submit" name="problemmode" value="EditXML" />
355: <input type="submit" name="problemmode" value="Edit" />
356: <hr />
357: <input type="submit" name="submit" value="View" />
358: <hr />
359: List of possible answers:
360: </form>';
361: $request->print($result);
362: $request->rflush();
363: }
364:
365: sub analyze_footer {
366: my ($request) = @_;
367: my $result='</body></html>';
368: $request->print($result);
369: $request->rflush();
370: }
371:
372: sub analyze {
373: my ($request,$file) = @_;
374: &Apache::lonxml::debug("Analyze");
375: my $result;
376: my %overall;
377: my %allparts;
378: my $rndseed=$ENV{'form.rndseed'};
379: &analyze_header($request);
380: my %prog_state=
381: &Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
382: 'Getting Problem Variants',
383: $ENV{'form.numtoanalyze'});
384: for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
385: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
386: 'last problem');
387: my $subresult=&Apache::lonnet::ssi($request->uri,
388: ('grade_target' => 'analyze'),
389: ('rndseed' => $i));
390: &Apache::lonxml::debug(":$subresult:");
391: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
392: my %analyze=&Apache::lonnet::str2hash($subresult);
393: my @parts;
394: if (defined(@{ $analyze{'parts'} })) {
395: @parts=@{ $analyze{'parts'} };
396: }
397: foreach my $part (@parts) {
398: if (!exists($allparts{$part})) {$allparts{$part}=1;};
399: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
400: $analyze{$part.'.type'} eq 'stringresponse' ||
401: $analyze{$part.'.type'} eq 'formularesponse' ) {
402: push( @{ $overall{$part.'.answer'} },
403: [@{ $analyze{$part.'.answer'} }]);
404: }
405: }
406: }
407: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
408: 'Analyzing Results');
409: foreach my $part (keys(%allparts)) {
410: if (defined(@{ $overall{$part.'.answer'} })) {
411: $request->print('<table><tr><td>Part '.$part.'</td></tr>');
412: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
413: $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
414: '</td></tr>');
415: }
416: $request->print('</table>');
417: } else {
418: $request->print('<p>Part '.$part.
419: ' is not analyzabale at this time</p>');
420: }
421: }
422: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
423: &analyze_footer($request);
424: &Apache::lonhomework::showhash(%overall);
425: return $result;
426: }
427:
428: sub editxmlmode {
429: my ($request,$file) = @_;
430: my $result;
431: my $problem=&Apache::lonnet::getfile($file);
432: if ($problem eq -1) {
433: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
434: $problem='';
435: }
436: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
437: my $error=&handle_save_or_undo($request,\$problem,
438: \$ENV{'form.editxmltext'});
439: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
440: }
441: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
442: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
443: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
444: $ENV{'form.problemmode'}='View';
445: &renderpage($request,$file);
446: } else {
447: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
448: my $xml_help = '<table><tr><td>'.
449: &Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
450: .'</td><td>'.
451: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
452: undef,undef,600)
453: .'</td><td>'.
454: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
455: undef,undef,600)
456: .'</td></tr></table>';
457: if ($cols > 80) { $cols = 80; }
458: if ($cols < 70) { $cols = 70; }
459: if ($rows < 20) { $rows = 20; }
460: $result.='<html><body bgcolor="#FFFFFF">
461: <form name="lonhomework" method="POST" action="'.
462: $ENV{'request.uri'}.'">
463: <input type="hidden" name="problemmode" value="EditXML" />
464: <input type="submit" name="problemmode" value="Discard Edits and View" />
465: <input type="submit" name="problemmode" value="Edit" />
466: <hr />
467: <input type="submit" name="submit" value="Submit Changes" />
468: <input type="submit" name="submit" value="Submit Changes and View" />
469: <input type="submit" name="Undo" value="undo" />
470: <hr />
471: ' . $xml_help . '
472: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
473: &HTML::Entities::encode($problem).'</textarea>
474: </form></body></html>';
475: $request->print($result);
476: }
477: return '';
478: }
479:
480: sub renderpage {
481: my ($request,$file) = @_;
482:
483: my (@targets) = &get_target();
484: &Apache::lonxml::debug("Running targets ".join(':',@targets));
485: foreach my $target (@targets) {
486: #my $t0 = [&gettimeofday()];
487: my $problem=&Apache::lonnet::getfile($file);
488: if ($problem eq -1) {
489: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
490: $problem='';
491: }
492:
493: my %mystyle;
494: my $result = '';
495: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
496: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
497: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
498:
499: &Apache::lonxml::debug("Should be parsing now");
500: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
501: &setup_vars($target),%mystyle);
502: undef($Apache::lonhomework::parsing_a_problem);
503: #$request->print("Result follows:");
504: if ($target eq 'modified') {
505: &handle_save_or_undo($request,\$problem,\$result);
506: } else {
507: if ($target eq 'analyze') {
508: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
509: undef(%Apache::lonhomework::analyze);
510: }
511: #my $td=&tv_interval($t0);
512: #if ( $Apache::lonxml::debug) {
513: #$result =~ s:</body>::;
514: #$result.="<br />Spent $td seconds processing target $target\n</body>";
515: #}
516: $request->print($result);
517: $request->rflush();
518: }
519: #$request->print(":Result ends");
520: #my $td=&tv_interval($t0);
521: }
522: }
523:
524: # with no arg it returns a HTML <option> list of the template titles
525: # with one arg it returns the filename associated with the arg passed
526: sub get_template_list {
527: my ($namewanted,$extension) = @_;
528: my $result;
529: my @allnames;
530: &Apache::lonxml::debug("Looking for :$extension:");
531: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
532: my $name=&Apache::lonnet::metadata($file,'title');
533: if ($namewanted && ($name eq $namewanted)) {
534: $result=$file;
535: last;
536: } else {
537: if ($name) { push (@allnames, $name); }
538: }
539: }
540: if (@allnames && !$result) {
541: $result="<option>Select a $extension template</option>\n<option>".
542: join('</option><option>',sort(@allnames)).'</option>';
543: }
544: return $result;
545: }
546:
547: sub newproblem {
548: my ($request) = @_;
549: my $extension=$request->uri;
550: $extension=~s:^.*\.([\w]+)$:$1:;
551: &Apache::lonxml::debug("Looking for :$extension:");
552: if ($ENV{'form.template'} &&
553: $ENV{'form.template'} ne "Select a $extension type") {
554: use File::Copy;
555: my $file = &get_template_list($ENV{'form.template'},$extension);
556: my $dest = &Apache::lonnet::filelocation("",$request->uri);
557: copy($file,$dest);
558: &renderpage($request,$dest);
559: } elsif($ENV{'form.newfile'}) {
560: # I don't like hard-coded filenames but for now, this will work.
561: use File::Copy;
562: my $templatefilename =
563: $request->dir_config('lonIncludes').'/templates/blank.problem';
564: &Apache::lonxml::debug("$templatefilename");
565: my $dest = &Apache::lonnet::filelocation("",$request->uri);
566: copy($templatefilename,$dest);
567: &renderpage($request,$dest);
568: } else {
569: my $templatelist=&get_template_list('',$extension);
570: my $url=$request->uri;
571: my $dest = &Apache::lonnet::filelocation("",$request->uri);
572: my $instructions;
573: if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
574: $request->print(<<ENDNEWPROBLEM);
575: <body bgcolor="#FFFFFF">
576: <h1>Creating a new $extension resource</h1>
577: The requested file <tt>$url</tt> currently does not exist.
578: <p>
579: To create a new $extension$instructions click on the "Create $extension" button.
580: </p>
581: <p><form action="$url" method="POST">
582: ENDNEWPROBLEM
583: if (defined($templatelist)) {
584: $request->print("<select name=\"template\">$templatelist</select>");
585: }
586: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
587: $request->print("</form></p></body>");
588: }
589: return '';
590: }
591:
592: sub view_or_edit_menu {
593: my ($request) = @_;
594: my $url=$request->uri;
595: $request->print(<<EDITMENU);
596: <body bgcolor="#FFFFFF">
597: <form action="$url" method="POST">
598: Would you like to <input type="submit" name="problemmode" value="View"> or
599: <input type="submit" name="problemmode" value="Edit"> the problem.
600: </form>
601: </body>
602: EDITMENU
603: }
604:
605: sub handler {
606: #my $t0 = [&gettimeofday()];
607: my $request=$_[0];
608:
609: $Apache::lonxml::debug=$ENV{'user.debug'};
610:
611: if (&setupheader($request)) { return OK; }
612: $ENV{'request.uri'}=$request->uri;
613:
614: #setup permissions
615: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
616: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
617: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
618: # some times multiple problemmodes are submitted, need to select
619: # the last one
620: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
621: if ( defined($ENV{'form.problemmode'}) &&
622: ref($ENV{'form.problemmode'}) ) {
623: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
624: my $mode=$ENV{'form.problemmode'}->[-1];
625: undef $ENV{'form.problemmode'};
626: $ENV{'form.problemmode'}=$mode;
627: }
628: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
629: my $file=&Apache::lonnet::filelocation("",$request->uri);
630:
631: #check if we know where we are
632: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
633: # if we are browsing we might not be able to know where we are
634: if ($Apache::lonhomework::browse ne 'F') {
635: #should know where we are, so ask
636: $request->internal_redirect('/adm/ambiguous'); return;
637: }
638: }
639:
640: my ($symb) = &Apache::lonxml::whichuser();
641: &Apache::lonxml::debug('symb is '.$symb);
642: if ($ENV{'request.state'} eq "construct" || $symb eq '') {
643: if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
644: $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
645: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
646: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
647: }
648: }
649: if ($ENV{'request.state'} eq "construct") {
650: if ( -e $file ) {
651: if (!(defined $ENV{'form.problemmode'})) {
652: #first visit to problem in construction space
653: #&view_or_edit_menu($request);
654: $ENV{'form.problemmode'}='View';
655: &renderpage($request,$file);
656: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
657: &editxmlmode($request,$file);
658: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
659: &analyze($request,$file);
660: } else {
661: &renderpage($request,$file);
662: }
663: } else {
664: # requested file doesn't exist in contruction space
665: &newproblem($request);
666: }
667: } else {
668: # just render the page normally outside of construction space
669: &Apache::lonxml::debug("not construct");
670: &renderpage($request,$file);
671: }
672: #my $td=&tv_interval($t0);
673: #&Apache::lonxml::debug("Spent $td seconds processing");
674: # &Apache::lonhomework::send_footer($request);
675: # always turn off debug messages
676: $Apache::lonxml::debug=0;
677: return OK;
678:
679: }
680:
681: 1;
682: __END__
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