1: # The LearningOnline Network with CAPA
2: # The LON-CAPA Homework handler
3: #
4: # $Id: lonhomework.pm,v 1.126 2003/05/13 01:56:32 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 (($ENV{'request.state'} eq "published") ||
65: ($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: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
290: return ''
291: }
292:
293: sub setupheader {
294: my $request=$_[0];
295: if ($ENV{'browser.mathml'}) {
296: $request->content_type('text/xml');
297: } else {
298: $request->content_type('text/html');
299: }
300: $request->content_encoding('UTF-8');
301: if (!$Apache::lonxml::debug && ($ENV{'REQUEST_METHOD'} eq 'GET')) {
302: &Apache::loncommon::no_cache($request);
303: }
304: $request->send_http_header;
305: return OK if $request->header_only;
306: return ''
307: }
308:
309: sub handle_save_or_undo {
310: my ($request,$problem,$result) = @_;
311: my $file = &Apache::lonnet::filelocation("",$request->uri);
312: my $filebak =$file.".bak";
313: my $filetmp =$file.".tmp";
314: my $error=0;
315:
316: if ($ENV{'form.Undo'} eq 'undo') {
317: my $error=0;
318: if (!copy($file,$filetmp)) { $error=1; }
319: if ((!$error) && (!copy($filebak,$file))) { $error=1; }
320: if ((!$error) && (!move($filetmp,$filebak))) { $error=1; }
321: if (!$error) {
322: $request->print("<p><b>Undid changes, Switched $filebak and $file</b></p>");
323: } else {
324: $request->print("<p><font color=\"red\" size=\"+1\"><b>Unable to undo, unable to switch $filebak and $file</b></font></p>");
325: $error=1;
326: }
327: } else {
328: my $fs=Apache::File->new(">$filebak");
329: if (defined($fs)) {
330: print $fs $$problem;
331: $request->print("<b>Making Backup to $filebak</b><br />");
332: } else {
333: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to make backup $filebak</b></font>");
334: $error=2;
335: }
336: my $fh=Apache::File->new(">$file");
337: if (defined($fh)) {
338: print $fh $$result;
339: $request->print("<b>Saving Modifications to $file</b><br />");
340: } else {
341: $request->print("<font color=\"red\" size=\"+1\"><b>Unable to write to $file</b></font>");
342: $error|=4;
343: }
344: }
345: return $error;
346: }
347:
348: sub analyze_header {
349: my ($request) = @_;
350: my $result.='<html>
351: <head><title>Analyzing a problem</title></head>
352: <body bgcolor="#FFFFFF">
353: <form name="lonhomework" method="POST" action="'.
354: $ENV{'request.uri'}.'">
355: <input type="submit" name="problemmode" value="EditXML" />
356: <input type="submit" name="problemmode" value="Edit" />
357: <hr />
358: <input type="submit" name="submit" value="View" />
359: <hr />
360: List of possible answers:
361: </form>';
362: $request->print($result);
363: $request->rflush();
364: }
365:
366: sub analyze_footer {
367: my ($request) = @_;
368: my $result='</body></html>';
369: $request->print($result);
370: $request->rflush();
371: }
372:
373: sub analyze {
374: my ($request,$file) = @_;
375: &Apache::lonxml::debug("Analyze");
376: my $result;
377: my %overall;
378: my %allparts;
379: my $rndseed=$ENV{'form.rndseed'};
380: &analyze_header($request);
381: my %prog_state=
382: &Apache::lonhtmlcommon::Create_PrgWin($request,'Analyze Progress',
383: 'Getting Problem Variants',
384: $ENV{'form.numtoanalyze'});
385: for(my $i=1;$i<$ENV{'form.numtoanalyze'}+1;$i++) {
386: &Apache::lonhtmlcommon::Increment_PrgWin($request,\%prog_state,
387: 'last problem');
388: my $subresult=&Apache::lonnet::ssi($request->uri,
389: ('grade_target' => 'analyze'),
390: ('rndseed' => $i));
391: &Apache::lonxml::debug(":$subresult:");
392: (my $garbage,$subresult)=split(/_HASH_REF__/,$subresult,2);
393: my %analyze=&Apache::lonnet::str2hash($subresult);
394: my @parts;
395: if (defined(@{ $analyze{'parts'} })) {
396: @parts=@{ $analyze{'parts'} };
397: }
398: foreach my $part (@parts) {
399: if (!exists($allparts{$part})) {$allparts{$part}=1;};
400: if ($analyze{$part.'.type'} eq 'numericalresponse' ||
401: $analyze{$part.'.type'} eq 'stringresponse' ||
402: $analyze{$part.'.type'} eq 'formularesponse' ) {
403: push( @{ $overall{$part.'.answer'} },
404: [@{ $analyze{$part.'.answer'} }]);
405: }
406: }
407: }
408: &Apache::lonhtmlcommon::Update_PrgWin($request,\%prog_state,
409: 'Analyzing Results');
410: foreach my $part (keys(%allparts)) {
411: if (defined(@{ $overall{$part.'.answer'} })) {
412: $request->print('<table><tr><td>Part '.$part.'</td></tr>');
413: foreach my $answer (sort {$a->[0] <=> $b->[0]} (@{ $overall{$part.'.answer'} })) {
414: $request->print('<tr><td>'.join('</td><td>',@{ $answer }).
415: '</td></tr>');
416: }
417: $request->print('</table>');
418: } else {
419: $request->print('<p>Part '.$part.
420: ' is not analyzabale at this time</p>');
421: }
422: }
423: &Apache::lonhtmlcommon::Close_PrgWin($request,\%prog_state);
424: &analyze_footer($request);
425: &Apache::lonhomework::showhash(%overall);
426: return $result;
427: }
428:
429: sub editxmlmode {
430: my ($request,$file) = @_;
431: my $result;
432: my $problem=&Apache::lonnet::getfile($file);
433: if ($problem eq -1) {
434: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
435: $problem='';
436: }
437: if (defined($ENV{'form.editxmltext'}) || defined($ENV{'form.Undo'})) {
438: my $error=&handle_save_or_undo($request,\$problem,
439: \$ENV{'form.editxmltext'});
440: if (!$error) { $problem=&Apache::lonnet::getfile($file); }
441: }
442: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
443: if ( $ENV{'form.submit'} eq 'Submit Changes and View' ) {
444: &Apache::lonhomework::showhashsubset(\%ENV,'^form');
445: $ENV{'form.problemmode'}='View';
446: &renderpage($request,$file);
447: } else {
448: my ($rows,$cols) = &Apache::edit::textarea_sizes(\$problem);
449: my $xml_help = '<table><tr><td>'.
450: &Apache::loncommon::help_open_topic("Problem_Editor_XML_Index",'Problem Editing Help')
451: .'</td><td>'.
452: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
453: undef,undef,600)
454: .'</td><td>'.
455: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
456: undef,undef,600)
457: .'</td></tr></table>';
458: if ($cols > 80) { $cols = 80; }
459: if ($cols < 70) { $cols = 70; }
460: if ($rows < 20) { $rows = 20; }
461: $result.='<html><body bgcolor="#FFFFFF">
462: <form name="lonhomework" method="POST" action="'.
463: $ENV{'request.uri'}.'">
464: <input type="hidden" name="problemmode" value="EditXML" />
465: <input type="submit" name="problemmode" value="Discard Edits and View" />
466: <input type="submit" name="problemmode" value="Edit" />
467: <hr />
468: <input type="submit" name="submit" value="Submit Changes" />
469: <input type="submit" name="submit" value="Submit Changes and View" />
470: <input type="submit" name="Undo" value="undo" />
471: <hr />
472: ' . $xml_help . '
473: <textarea rows="'.$rows.'" cols="'.$cols.'" name="editxmltext">'.
474: &HTML::Entities::encode($problem).'</textarea>
475: </form></body></html>';
476: $request->print($result);
477: }
478: return '';
479: }
480:
481: sub renderpage {
482: my ($request,$file) = @_;
483:
484: my (@targets) = &get_target();
485: &Apache::lonxml::debug("Running targets ".join(':',@targets));
486: foreach my $target (@targets) {
487: #my $t0 = [&gettimeofday()];
488: my $problem=&Apache::lonnet::getfile($file);
489: if ($problem eq -1) {
490: &Apache::lonxml::error("<b> Unable to find <i>$file</i></b>");
491: $problem='';
492: }
493:
494: my %mystyle;
495: my $result = '';
496: if ($target eq 'analyze') { %Apache::lonhomework::analyze=(); }
497: if ($target eq 'answer') { &showhash(%Apache::lonhomework::history); }
498: if ($target eq 'web') {&Apache::lonhomework::showhashsubset(\%ENV,'^form');}
499:
500: &Apache::lonxml::debug("Should be parsing now");
501: $result = &Apache::lonxml::xmlparse($request, $target, $problem,
502: &setup_vars($target),%mystyle);
503: undef($Apache::lonhomework::parsing_a_problem);
504: #$request->print("Result follows:");
505: if ($target eq 'modified') {
506: &handle_save_or_undo($request,\$problem,\$result);
507: } else {
508: if ($target eq 'analyze') {
509: $result=&Apache::lonnet::hashref2str(\%Apache::lonhomework::analyze);
510: undef(%Apache::lonhomework::analyze);
511: }
512: #my $td=&tv_interval($t0);
513: #if ( $Apache::lonxml::debug) {
514: #$result =~ s:</body>::;
515: #$result.="<br />Spent $td seconds processing target $target\n</body>";
516: #}
517: $request->print($result);
518: $request->rflush();
519: }
520: #$request->print(":Result ends");
521: #my $td=&tv_interval($t0);
522: }
523: }
524:
525: # with no arg it returns a HTML <option> list of the template titles
526: # with one arg it returns the filename associated with the arg passed
527: sub get_template_list {
528: my ($namewanted,$extension) = @_;
529: my $result;
530: my @allnames;
531: &Apache::lonxml::debug("Looking for :$extension:");
532: foreach my $file (</home/httpd/html/res/adm/includes/templates/*.$extension>) {
533: my $name=&Apache::lonnet::metadata($file,'title');
534: if ($namewanted && ($name eq $namewanted)) {
535: $result=$file;
536: last;
537: } else {
538: if ($name) { push (@allnames, $name); }
539: }
540: }
541: if (@allnames && !$result) {
542: $result="<option>Select a $extension template</option>\n<option>".
543: join('</option><option>',sort(@allnames)).'</option>';
544: }
545: return $result;
546: }
547:
548: sub newproblem {
549: my ($request) = @_;
550: my $extension=$request->uri;
551: $extension=~s:^.*\.([\w]+)$:$1:;
552: &Apache::lonxml::debug("Looking for :$extension:");
553: if ($ENV{'form.template'} &&
554: $ENV{'form.template'} ne "Select a $extension type") {
555: use File::Copy;
556: my $file = &get_template_list($ENV{'form.template'},$extension);
557: my $dest = &Apache::lonnet::filelocation("",$request->uri);
558: copy($file,$dest);
559: &renderpage($request,$dest);
560: } elsif($ENV{'form.newfile'}) {
561: # I don't like hard-coded filenames but for now, this will work.
562: use File::Copy;
563: my $templatefilename =
564: $request->dir_config('lonIncludes').'/templates/blank.problem';
565: &Apache::lonxml::debug("$templatefilename");
566: my $dest = &Apache::lonnet::filelocation("",$request->uri);
567: copy($templatefilename,$dest);
568: &renderpage($request,$dest);
569: } else {
570: my $templatelist=&get_template_list('',$extension);
571: my $url=$request->uri;
572: my $dest = &Apache::lonnet::filelocation("",$request->uri);
573: my $instructions;
574: if ($templatelist) { $instructions=", select a template from the pull-down menu below.<br />Then";}
575: $request->print(<<ENDNEWPROBLEM);
576: <body bgcolor="#FFFFFF">
577: <h1>Creating a new $extension resource</h1>
578: The requested file <tt>$url</tt> currently does not exist.
579: <p>
580: To create a new $extension$instructions click on the "Create $extension" button.
581: </p>
582: <p><form action="$url" method="POST">
583: ENDNEWPROBLEM
584: if (defined($templatelist)) {
585: $request->print("<select name=\"template\">$templatelist</select>");
586: }
587: $request->print("<br /><input type=\"submit\" name=\"newfile\" value=\"Create $extension\" />");
588: $request->print("</form></p></body>");
589: }
590: return '';
591: }
592:
593: sub view_or_edit_menu {
594: my ($request) = @_;
595: my $url=$request->uri;
596: $request->print(<<EDITMENU);
597: <body bgcolor="#FFFFFF">
598: <form action="$url" method="POST">
599: Would you like to <input type="submit" name="problemmode" value="View"> or
600: <input type="submit" name="problemmode" value="Edit"> the problem.
601: </form>
602: </body>
603: EDITMENU
604: }
605:
606: sub handler {
607: #my $t0 = [&gettimeofday()];
608: my $request=$_[0];
609:
610: $Apache::lonxml::debug=$ENV{'user.debug'};
611:
612: if (&setupheader($request)) { return OK; }
613: $ENV{'request.uri'}=$request->uri;
614:
615: #setup permissions
616: $Apache::lonhomework::browse= &Apache::lonnet::allowed('bre',$ENV{'request.filename'});
617: $Apache::lonhomework::viewgrades=&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'});
618: &Apache::lonxml::debug("Permissions:$Apache::lonhomework::browse:$Apache::lonhomework::viewgrades:");
619: # some times multiple problemmodes are submitted, need to select
620: # the last one
621: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
622: if ( defined($ENV{'form.problemmode'}) &&
623: ref($ENV{'form.problemmode'}) ) {
624: &Apache::lonxml::debug("Problem Mode ".join(",",@$ENV{'form.problemmode'}));
625: my $mode=$ENV{'form.problemmode'}->[-1];
626: undef $ENV{'form.problemmode'};
627: $ENV{'form.problemmode'}=$mode;
628: }
629: &Apache::lonxml::debug("Problem Mode ".$ENV{'form.problemmode'});
630: my $file=&Apache::lonnet::filelocation("",$request->uri);
631:
632: #check if we know where we are
633: if ($ENV{'request.course.fn'} && !&Apache::lonnet::symbread()) {
634: # if we are browsing we might not be able to know where we are
635: if ($Apache::lonhomework::browse ne 'F') {
636: #should know where we are, so ask
637: $request->internal_redirect('/adm/ambiguous'); return;
638: }
639: }
640:
641: my ($symb) = &Apache::lonxml::whichuser();
642: &Apache::lonxml::debug('symb is '.$symb);
643: if ($ENV{'request.state'} eq "construct" || $symb eq '') {
644: if ($ENV{'form.resetdata'} eq 'Reset Submissions' ||
645: $ENV{'form.resetdata'} eq 'New Problem Variation' ) {
646: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
647: &Apache::lonnet::tmpreset($symb,'',$domain,$name);
648: }
649: }
650: if ($ENV{'request.state'} eq "construct") {
651: if ( -e $file ) {
652: if (!(defined $ENV{'form.problemmode'})) {
653: #first visit to problem in construction space
654: #&view_or_edit_menu($request);
655: $ENV{'form.problemmode'}='View';
656: &renderpage($request,$file);
657: } elsif ($ENV{'form.problemmode'} eq 'EditXML') {
658: &editxmlmode($request,$file);
659: } elsif ($ENV{'form.problemmode'} eq 'Answer Distribution') {
660: &analyze($request,$file);
661: } else {
662: &renderpage($request,$file);
663: }
664: } else {
665: # requested file doesn't exist in contruction space
666: &newproblem($request);
667: }
668: } else {
669: # just render the page normally outside of construction space
670: &Apache::lonxml::debug("not construct");
671: &renderpage($request,$file);
672: }
673: #my $td=&tv_interval($t0);
674: #&Apache::lonxml::debug("Spent $td seconds processing");
675: # &Apache::lonhomework::send_footer($request);
676: # always turn off debug messages
677: $Apache::lonxml::debug=0;
678: return OK;
679:
680: }
681:
682: 1;
683: __END__
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