1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.113 2003/03/07 23:43:21 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::Constants qw(:common);
54: use HTML::Entities();
55: use Apache::loncommon();
56: #use Time::HiRes qw( gettimeofday tv_interval );
57:
58: BEGIN {
59: &Apache::lonxml::register_insert();
60: }
61:
62: sub get_target {
63: if ( $ENV{'request.state'} eq "published") {
64: if ( defined($ENV{'form.grade_target'} )
65: && ($ENV{'form.grade_target'} eq 'tex')) {
66: return ($ENV{'form.grade_target'});
67: } elsif ( defined($ENV{'form.grade_target'} )
68: && ($Apache::lonhomework::viewgrades == 'F' )) {
69: return ($ENV{'form.grade_target'});
70: }
71:
72: if ( defined($ENV{'form.submitted'})) {
73: return ('grade', 'web');
74: } else {
75: return ('web');
76: }
77: } elsif ($ENV{'request.state'} eq "construct") {
78: if ( defined($ENV{'form.grade_target'}) ) {
79: return ($ENV{'form.grade_target'});
80: }
81: if ( defined($ENV{'form.preview'})) {
82: if ( defined($ENV{'form.submitted'})) {
83: return ('grade', 'web');
84: } else {
85: return ('web');
86: }
87: } else {
88: if ( $ENV{'form.problemmode'} eq 'View' ||
89: $ENV{'form.problemmode'} eq 'Discard Edits and View') {
90: if ( defined($ENV{'form.submitted'}) &&
91: (!defined($ENV{'form.resetdata'})) ) {
92: return ('grade', 'web','answer');
93: } else {
94: return ('web','answer');
95: }
96: } elsif ( $ENV{'form.problemmode'} eq 'Edit' ) {
97: if ( $ENV{'form.submitted'} eq 'edit' ) {
98: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
99: return ('modified','web','answer');
100: } else {
101: return ('modified','edit');
102: }
103: } else {
104: return ('edit');
105: }
106: } else {
107: return ('web');
108: }
109: }
110: }
111: return ();
112: }
113:
114: sub setup_vars {
115: my ($target) = @_;
116: return ';'
117: # return ';$external::target='.$target.';';
118: }
119:
120: sub send_header {
121: my ($request)= @_;
122: $request->print(&Apache::lontexconvert::header());
123: # $request->print('<form name='.$ENV{'form.request.prefix'}.'lonhomework method="POST" action="'.$request->uri.'">');
124: }
125:
126: sub createmenu {
127: my ($which,$request)=@_;
128: if ($which eq 'grade') {
129: $request->print('<script language="JavaScript">
130: hwkmenu=window.open("/res/adm/pages/homeworkmenu.html","homeworkremote",
131: "height=350,width=150,menubar=no");
132: </script>');
133: }
134: }
135:
136: sub send_footer {
137: my ($request)= @_;
138: # $request->print('</form>');
139: $request->print(&Apache::lontexconvert::footer());
140: }
141:
142: $Apache::lonxml::browse='';
143:
144: # JB, 9/24/2002: Any changes in this function may require a change
145: # in lonnavmaps::resource::getDateStatus.
146: sub check_access {
147: my ($id) = @_;
148: my $date ='';
149: my $status;
150: my $datemsg = '';
151: my $lastdate = '';
152: my $temp;
153: my $type;
154: my $passed;
155:
156: if ($ENV{'request.state'} eq "construct") {
157: &Apache::lonxml::debug("in construction ignoring dates");
158: $status='CAN_ANSWER';
159: $datemsg='is in under construction';
160: return ($status,$datemsg);
161: }
162:
163: &Apache::lonxml::debug("checking for part :$id:");
164: &Apache::lonxml::debug("time:".time);
165: foreach $temp ("opendate","duedate","answerdate") {
166: $lastdate = $date;
167: $date = &Apache::lonnet::EXT("resource.$id.$temp");
168: my $thistype = &Apache::lonnet::EXT("resource.$id.$temp.type");
169: if ($thistype =~ /^(con_lost|no_such_host)/ ||
170: $date =~ /^(con_lost|no_such_host)/) {
171: $status='UNAVAILABLE';
172: $date="may open later.";
173: return($status,$date);
174: }
175: if ($thistype eq 'date_interval') {
176: if ($temp eq 'opendate') {
177: $date=&Apache::lonnet::EXT("resource.$id.duedate")-$date;
178: }
179: if ($temp eq 'answerdate') {
180: $date=&Apache::lonnet::EXT("resource.$id.duedate")+$date;
181: }
182: }
183: &Apache::lonxml::debug("found :$date: for :$temp:");
184: if ($date eq '') {
185: $date = "an unknown date"; $passed = 0;
186: } elsif ($date eq 'con_lost') {
187: $date = "an indeterminate date"; $passed = 0;
188: } else {
189: if (time < $date) { $passed = 0; } else { $passed = 1; }
190: $date = localtime $date;
191: }
192: if (!$passed) { $type=$temp; last; }
193: }
194: &Apache::lonxml::debug("have :$type:$passed:");
195: if ($passed) {
196: $status='SHOW_ANSWER';
197: $datemsg=$date;
198: } elsif ($type eq 'opendate') {
199: $status='CLOSED';
200: $datemsg = "will open on $date";
201: } elsif ($type eq 'duedate') {
202: $status='CAN_ANSWER';
203: $datemsg = "is due at $date";
204: } elsif ($type eq 'answerdate') {
205: $status='CLOSED';
206: $datemsg = "was due on $lastdate, and answers will be available on $date";
207: }
208: if ($status eq 'CAN_ANSWER') {
209: #check #tries
210: my $tries = $Apache::lonhomework::history{"resource.$id.tries"};
211: my $maxtries = &Apache::lonnet::EXT("resource.$id.maxtries");
212: if ( $tries eq '' ) { $tries = '0'; }
213: if ( $maxtries eq '' ) { $maxtries = '2'; }
214: if ($tries >= $maxtries) { $status = 'CANNOT_ANSWER'; }
215: }
216:
217: if (($status ne 'CLOSED') && ($Apache::lonhomework::type eq 'exam') &&
218: (!$Apache::lonhomework::history{"resource.0.outtoken"})) {
219: return ('UNCHECKEDOUT','needs to be checked out');
220: }
221:
222:
223: &Apache::lonxml::debug("sending back :$status:$datemsg:");
224: if (($Apache::lonhomework::browse eq 'F') && ($status eq 'CLOSED')) {
225: &Apache::lonxml::debug("should be allowed to browse a resource when closed");
226: $status='CAN_ANSWER';
227: $datemsg='is closed but you are allowed to view it';
228: }
229:
230: return ($status,$datemsg);
231: }
232:
233: sub showhash {
234: my (%hash) = @_;
235: &showhashsubset(\%hash,'.');
236: return '';
237: }
238:
239: sub showarray {
240: my ($array)=@_;
241: my $string="(";
242: foreach my $elm (@{ $array }) {
243: if (ref($elm)) {
244: if ($elm =~ /ARRAY/ ) {
245: $string.=&showarray($elm);
246: }
247: } else {
248: $string.="$elm,"
249: }
250: }
251: chop($string);
252: $string.=")";
253: return $string;
254: }
255:
256: sub showhashsubset {
257: my ($hash,$keyre) = @_;
258: my $resultkey;
259: foreach $resultkey (sort keys %$hash) {
260: if ($resultkey =~ /$keyre/) {
261: if (ref($$hash{$resultkey})) {
262: if ($$hash{$resultkey} =~ /ARRAY/ ) {
263: &Apache::lonxml::debug("$resultkey ---- ".
264: &showarray($$hash{$resultkey}));
265: } elsif ($$hash{$resultkey} =~ /HASH/ ) {
266: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
267: &showhashsubset($$hash{$resultkey},'.');
268: } else {
269: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
270: }
271: } else {
272: &Apache::lonxml::debug("$resultkey ---- $$hash{$resultkey}");
273: }
274: }
275: }
276: &Apache::lonxml::debug("\n<br />restored values^</br>\n");
277: return '';
278: }
279:
280: sub setuppermissions {
281: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
282: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
283: return ''
284: }
285:
286: sub setupheader {
287: my $request=$_[0];
288: if ($ENV{'browser.mathml'}) {
289: $request->content_type('text/xml');
290: } else {
291: $request->content_type('text/html');
292: }
293: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
294: &Apache::loncommon::no_cache($request);
295: }
296: $request->send_http_header;
297: return OK if $request->header_only;
298: return ''
299: }
300:
301: sub handle_save_or_undo {
302: my ($request,$problem,$result) = @_;
303: my $file = &Apache::lonnet::filelocation("",$request->uri);
304: my $filebak =$file.".bak";
305: my $filetmp =$file.".tmp";
306: my $error=0;
307:
308: if ($ENV{'form.Undo'} eq 'undo') {
309: my $error=0;
310: if (!copy($file,$filetmp)) { $error=1; }
311: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
312: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
313: if (!$error) {
314: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
315: } else {
316: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
317: $error=1;
318: }
319: } else {
320: my $fs=Apache::File->new(">$filebak");
321: if (defined($fs)) {
322: print $fs $$problem;
323: $request->print("<b>Making Backup to $filebak</b><br />");
324: } else {
325: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
326: $error=2;
327: }
328: my $fh=Apache::File->new(">$file");
329: if (defined($fh)) {
330: print $fh $$result;
331: $request->print("<b>Saving Modifications to $file</b><br />");
332: } else {
333: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
334: $error|=4;
335: }
336: }
337: return $error;
338: }
339:
340: sub analyze_header {
341: my ($request) = @_;
342: my $result.='<html>
343: <head><title>Analyzing a problem</title></head>
344: <body bgcolor="#FFFFFF">
345: <form name="lonhomework" method="POST" action="'.
346: $ENV{'request.uri'}.'">
347: <input type="submit" name="problemmode" value="EditXML" />
348: <input type="submit" name="problemmode" value="Edit" />
349: <hr />
350: <input type="submit" name="submit" value="View" />
351: <hr />
352: List of possible answers:
353: </form>';
354: $request->print($result);
355: $request->rflush();
356: }
357:
358: sub analyze_footer {
359: my ($request) = @_;
360: my $result='</body></html>';
361: $request->print($result);
362: $request->rflush();
363: }
364:
365: sub analyze {
366: my ($request,$file) = @_;
367: &Apache::lonxml::debug("Analyze");
368: my $result;
369: my %overall;
370: my %allparts;
371: my $rndseed=$ENV{'form.rndseed'};
372: &analyze_header($request);
373: for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
374: my $subresult=&Apache::lonnet::ssi($request->uri,
375: ('grade_target' => 'analyze'),
376: ('rndseed' => $i));
377: &Apache::lonxml::debug(":$subresult:");
378: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
379: my %analyze=&Apache::lonnet::str2hash($subresult);
380: $Apache::lonxml::debug=1;
381: &Apache::lonhomework::showhash(%analyze);
382: $Apache::lonxml::debug=0;
383: my @parts = @{ $analyze{'parts'} };
384: foreach my $part (@parts) {
385: if (!exists($allparts{$part})) {$allparts{$part}=1;};
386: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
387: $analyze{$part.'.type'} eq 'stringresponse' ||
388: $analyze{$part.'.type'} eq 'formularesponse' ) {
389: push( @{ $overall{$part.'.answer'} },
390: [@{ $analyze{$part.'.answer'} }]);
391: }
392: }
393: }
394: foreach my $part (keys(%allparts)) {
395: if (defined(@{ $overall{$part.'.answer'} })) {
396: $request->print('<table><tr><td>Part '.$part.'</td></tr>');
397: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
398: $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
399: '</td></tr>');
400: }
401: $request->print('</table>');
402: } else {
403: $request->print('<p>Part '.$part.
404: ' is not analyzabale at this time</p>');
405: }
406: }
407: &analyze_footer($request);
408: &Apache::lonhomework::showhash(%overall);
409: return $result;
410: }
411:
412: sub editxmlmode {
413: my ($request,$file) = @_;
414: my $result;
415: my $problem=&Apache::lonnet::getfile($file);
416: if ($problem == -1) {
417: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
418: $problem='';
419: }
420: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
421: my $error=&handle_save_or_undo($request,\$problem,
422: \$ENV{'form.editxmltext'});
423: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
424: }
425: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
426: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
427: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
428: $ENV{'form.problemmode'}='View';
429: &renderpage($request,$file);
430: } else {
431: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
432: my $xml_help = '<table><tr><td>'.
433: &Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
434: .'</td><td>'.
435: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
436: undef,undef,600)
437: .'</td><td>'.
438: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
439: undef,undef,600)
440: .'</td></tr></table>';
441: if ($cols > 80) { $cols = 80; }
442: if ($cols < 70) { $cols = 70; }
443: if ($rows < 20) { $rows = 20; }
444: $result.='<html><body bgcolor="#FFFFFF">
445: <form name="lonhomework" method="POST" action="'.
446: $ENV{'request.uri'}.'">
447: <input type="hidden" name="problemmode" value="EditXML" />
448: <input type="submit" name="problemmode" value="Discard Edits and View" />
449: <input type="submit" name="problemmode" value="Edit" />
450: <hr />
451: <input type="submit" name="submit" value="Submit Changes" />
452: <input type="submit" name="submit" value="Submit Changes and View" />
453: <input type="submit" name="Undo" value="undo" />
454: <hr />
455: ' . $xml_help . '
456: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
457: &HTML::Entities::encode($problem).'</textarea>
458: </form></body></html>';
459: $request->print($result);
460: }
461: return '';
462: }
463:
464: sub renderpage {
465: my ($request,$file) = @_;
466:
467: my (@targets) = &get_target();
468: &Apache::lonxml::debug("Running targets ".join(':',@targets));
469: foreach my $target (@targets) {
470: #my $t0 = [&gettimeofday()];
471: my $problem=&Apache::lonnet::getfile($file);
472: if ($problem == -1) {
473: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
474: $problem='';
475: }
476:
477: my %mystyle;
478: my $result = '';
479: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
480: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
481: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
482:
483: &Apache::lonxml::debug("Should be parsing now");
484: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
485: &setup_vars($target),%mystyle);
486: undef($Apache::lonhomework::parsing_a_problem);
487: #$request->print("Result follows:");
488: if ($target eq 'modified') {
489: &handle_save_or_undo($request,\$problem,\$result);
490: } else {
491: if ($target eq 'analyze') {
492: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
493: undef(%Apache::lonhomework::analyze);
494: }
495: #my $td=&tv_interval($t0);
496: #if ( $Apache::lonxml::debug) {
497: #$result =~ s:</body>::;
498: #$result.="<br />Spent $td seconds processing target $target\n</body>";
499: #}
500: $request->print($result);
501: $request->rflush();
502: }
503: #$request->print(":Result ends");
504: #my $td=&tv_interval($t0);
505: }
506: }
507:
508: # with no arg it returns a HTML <option> list of the template titles
509: # with one arg it returns the filename associated with the arg passed
510: sub get_template_list {
511: my ($namewanted,$extension) = @_;
512: my $result;
513: my @allnames;
514: &Apache::lonxml::debug("Looking for :$extension:");
515: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
516: my $name=&Apache::lonnet::metadata($file,'title');
517: if ($namewanted && ($name eq $namewanted)) {
518: $result=$file;
519: last;
520: } else {
521: if ($name) { push (@allnames, $name); }
522: }
523: }
524: if (@allnames && !$result) {
525: $result="<option>Select a $extension type</option>\n<option>".
526: join('</option><option>',sort(@allnames)).'</option>';
527: }
528: return $result;
529: }
530:
531: sub newproblem {
532: my ($request) = @_;
533: my $extension=$request->uri;
534: $extension=~s:^.*\.([\w]+)$:$1:;
535: &Apache::lonxml::debug("Looking for :$extension:");
536: if ($ENV{'form.template'} &&
537: $ENV{'form.template'} ne "Select a $extension type") {
538: use File::Copy;
539: my $file = &get_template_list($ENV{'form.template'},$extension);
540: my $dest = &Apache::lonnet::filelocation("",$request->uri);
541: copy($file,$dest);
542: &renderpage($request,$dest);
543: } elsif($ENV{'form.newfile'}) {
544: # I don't like hard-coded filenames but for now, this will work.
545: use File::Copy;
546: my $templatefilename =
547: $request->dir_config('lonIncludes').'/templates/blank.problem';
548: &Apache::lonxml::debug("$templatefilename");
549: my $dest = &Apache::lonnet::filelocation("",$request->uri);
550: copy($templatefilename,$dest);
551: &renderpage($request,$dest);
552: } else {
553: my $templatelist=&get_template_list('',$extension);
554: my $url=$request->uri;
555: my $dest = &Apache::lonnet::filelocation("",$request->uri);
556: my $instructions;
557: if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
558: $request->print(<<ENDNEWPROBLEM);
559: <body bgcolor="#FFFFFF">
560: <h1>Creating a new $extension resource</h1>
561: The requested file <tt>$url</tt> currently does not exist.
562: <p>
563: To create a new $extension$instructions click on the "Create $extension" button.
564: </p>
565: <p><form action="$url" method="POST">
566: ENDNEWPROBLEM
567: if (defined($templatelist)) {
568: $request->print("<select name=\"template\">$templatelist</select>");
569: }
570: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
571: $request->print("</form></p></body>");
572: }
573: return '';
574: }
575:
576: sub view_or_edit_menu {
577: my ($request) = @_;
578: my $url=$request->uri;
579: $request->print(<<EDITMENU);
580: <body bgcolor="#FFFFFF">
581: <form action="$url" method="POST">
582: Would you like to <input type="submit" name="problemmode" value="View"> or
583: <input type="submit" name="problemmode" value="Edit"> the problem.
584: </form>
585: </body>
586: EDITMENU
587: }
588:
589: sub handler {
590: #my $t0 = [&gettimeofday()];
591: my $request=$_[0];
592:
593: # if ( $ENV{'user.name'} eq 'albertel' ) {$Apache::lonxml::debug=1;}
594: $Apache::lonxml::debug=$ENV{'user.debug'};
595:
596: if (&setupheader($request)) { return OK; }
597: $ENV{'request.uri'}=$request->uri;
598:
599: #setup permissions
600: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
601: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
602: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
603: # some times multiple problemmodes are submitted, need to select
604: # the last one
605: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
606: if ( defined($ENV{'form.problemmode'}) &&
607: ref($ENV{'form.problemmode'}) ) {
608: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
609: my $mode=$ENV{'form.problemmode'}->[-1];
610: undef $ENV{'form.problemmode'};
611: $ENV{'form.problemmode'}=$mode;
612: }
613: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
614: my $file=&Apache::lonnet::filelocation("",$request->uri);
615:
616: #check if we know where we are
617: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
618: # if we are browsing we might not be able to know where we are
619: if ($Apache::lonhomework::browse ne 'F') {
620: #should know where we are, so ask
621: $request->internal_redirect('/adm/ambiguous'); return;
622: }
623: }
624:
625: if ($ENV{'request.state'} eq "construct") {
626: if ($ENV{'form.resetdata'} eq 'Reset Submissions') {
627: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
628: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
629: }
630: if ( -e $file ) {
631: if (!(defined $ENV{'form.problemmode'})) {
632: #first visit to problem in construction space
633: #&view_or_edit_menu($request);
634: $ENV{'form.problemmode'}='View';
635: &renderpage($request,$file);
636: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
637: &editxmlmode($request,$file);
638: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
639: &analyze($request,$file);
640: } else {
641: &renderpage($request,$file);
642: }
643: } else {
644: # requested file doesn't exist in contruction space
645: &newproblem($request);
646: }
647: } else {
648: # just render the page normally outside of construction space
649: &Apache::lonxml::debug("not construct");
650: &renderpage($request,$file);
651: }
652: #my $td=&tv_interval($t0);
653: #&Apache::lonxml::debug("Spent $td seconds processing");
654: # &Apache::lonhomework::send_footer($request);
655: # always turn off debug messages
656: $Apache::lonxml::debug=0;
657: return OK;
658:
659: }
660:
661: 1;
662: __END__
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