1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.150 2003/02/25 23:18:22 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: # 2/19 Guy
29: # 6/26/2001 fixed extra web display at end of <web></web> tags
30: # 8/17,8/18,8/20 Gerd Kortemeyer
31:
32:
33: package Apache::structuretags;
34:
35: use strict;
36: use Apache::lonnet;
37: use Apache::File();
38: use Apache::lonmenu;
39:
40: BEGIN {
41: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
42: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
43: }
44:
45: sub start_web {
46: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
47: my $bodytext=&Apache::lonxml::get_all_text("/web",$parser);
48: if ($target eq 'web') {
49: return $bodytext;
50: }
51: return '';
52: }
53:
54: sub end_web {
55: return '';
56: }
57:
58: sub start_tex {
59: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
60: my $bodytext=&Apache::lonxml::get_all_text("/tex",$parser);
61: if ($target eq 'tex') {
62: return $bodytext.' ';
63: }
64: return '';
65: }
66:
67: sub end_tex {
68: return '';
69: }
70:
71: sub page_start {
72: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
73: my %found;
74: foreach my $taginside ($tagstack) {
75: foreach my $taglookedfor ('html','body','form') {
76: if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
77: }
78: }
79:
80: my $result;
81: my $head_tag_start;
82: if (!defined($found{'html'})) {
83: $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
84: $parser,$safeeval);
85: $head_tag_start='<head>'.&Apache::lonmenu::registerurl(undef,$target);
86: }
87: my $body_tag_start;
88: if (!defined($found{'body'})) {
89: $body_tag_start='<body onLoad="'.&Apache::lonmenu::loadevents().'" '.
90: 'onUnload="'.&Apache::lonmenu::unloadevents().'" ';
91: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
92: if ($background) {
93: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
94: $background;
95: $body_tag_start.='background="'.$background.'" ';
96: } else {
97: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
98: if ($bgcolor) {
99: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
100: } else {
101: $body_tag_start.='bgcolor="#ffffff"';
102: }
103: }
104: $body_tag_start.='>'.&Apache::lonmenu::menubuttons(undef,$target);
105: if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
106: my ($symb)=&Apache::lonxml::whichuser();
107: if ($symb eq '') {
108: my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
109: $help="Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />";
110: $body_tag_start.=$help;
111: }
112: }
113: }
114: my $form_tag_start;
115: if (!defined($found{'form'})) {
116: $form_tag_start='<form name="lonhomework" method="POST" action="'.
117: $ENV{'request.uri'}.'">';
118: }
119: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
120: }
121:
122: #use Time::HiRes();
123: sub get_resource_name {
124: my ($parstack,$safeeval)=@_;
125: my $name=&Apache::lonnet::gettitle();
126: if ($name eq '') {
127: $name=&Apache::lonnet::EXT('resource.title');
128: if ($name eq 'con_lost') { $name = ''; }
129: }
130: $Apache::lonhomework::name=$name;
131: return $name;
132: }
133:
134: sub setup_rndseed {
135: my ($safeeval)=@_;
136: my $rndseed;
137: if ($ENV{'request.state'} eq "construct") {
138: $rndseed=$ENV{'form.rndseed'};
139: if (!$rndseed) {
140: $rndseed=time;
141: $ENV{'form.rndseed'}=$rndseed;
142: }
143: &Apache::lonxml::debug("Setting rndseed to $rndseed");
144: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
145: }
146: return $rndseed;
147: }
148:
149: sub problem_edit_header {
150: return '<input type="hidden" name="submitted" value="edit" />
151: <input type="hidden" name="problemmode" value="Edit" />
152: <input type="submit" name="problemmode" value="Discard Edits and View" />
153: <input type="submit" name="problemmode" value="EditXML" />
154: <input type="submit" name="Undo" value="undo" /> <hr />
155: <input type="submit" name="submit" value="Submit Changes and Edit" />
156: <input type="submit" name="submit" value="Submit Changes and View" /><br /><p> </p><table border="0"><tr><td bgcolor="#DDDDDD">
157: ';
158: }
159:
160: sub problem_edit_footer {
161: return '</td></tr></table><br /><input type="submit" name="submit" value="Submit Changes and Edit" />
162: <input type="submit" name="submit" value="Submit Changes and View" />';
163: }
164:
165: sub problem_web_to_edit_header {
166: my ($rndseed)=@_;
167: my $result.='<input type="hidden" name="problemmode" value="View" />
168: <input type="submit" name="problemmode" value="Edit" />
169: <input type="submit" name="problemmode" value="EditXML" />
170: Random Seed:<input type="text" name="rndseed" width="10" value="'.
171: $rndseed.'" />
172: <input type="submit" name="changerandseed" value="Change" />
173: <input type="submit" name="resetdata" value="Reset Submissions" />
174: <input type="checkbox" name="showallfoils" ';
175: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
176: $result.= ' /> Show All Foils
177: <hr />';
178: my $numtoanalyze=$ENV{'form.numtoanalyze'};
179: if (!$numtoanalyze) { $numtoanalyze=100; }
180: $result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
181: <input type="text" name="numtoanalyze" value="'.
182: $numtoanalyze.'" size="5" /> <hr />';
183: return $result;
184: }
185:
186: sub initialize_storage {
187: %Apache::lonhomework::results=();
188: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
189: if ($ENV{'request.state'} eq 'construct') {
190: %Apache::lonhomework::history=
191: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
192: my ($temp)=keys %Apache::lonhomework::history ;
193: &Apache::lonxml::debug("Return message of $temp");
194: } else {
195: %Apache::lonhomework::history=
196: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
197: }
198: #ignore error conditions
199: my ($temp)=keys %Apache::lonhomework::history ;
200: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
201: }
202:
203: # -------------------------------------------------------------finalize_storage
204: # Stores away the result has to a student's environment
205: # checks form.grade_ for specific values, other wises stores
206: # to the running users environment
207: sub finalize_storage {
208: my $result;
209: my ($temp) = keys %Apache::lonhomework::results;
210: if ( $temp ne '' ) {
211: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
212: if ($ENV{'request.state'} eq 'construct') {
213: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
214: $ENV{'request.uri'},'',$domain,$name);
215: &Apache::lonxml::debug('Construct Store return message:'.$result);
216: } else {
217: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
218: $symb,$courseid,$domain,$name);
219: &Apache::lonxml::debug('Store return message:'.$result);
220: }
221: }
222: return $result;
223: }
224:
225: sub checkout_msg {
226: return (<<ENDCHECKOUT);
227: <h2>The resource needs to be checked out</h2>
228: As a resource gets checked out, a unique timestamped ID is given to it, and a
229: permanent record is left in the system.<p />
230: <font color=red>
231: Checking out resources is subject to course policies, and may exclude future
232: credit even if done erroneously.<p />
233: </font>
234: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
235: <input type="hidden" name="doescheckout" value="yes" />
236: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
237: </form>
238: ENDCHECKOUT
239: }
240:
241: sub start_problem {
242: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
243:
244: # meta is called from lonpublisher, which doesn't uses the normal
245: # lonhomework method of parsing the file which means that inputtags
246: # won't get reset
247: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
248: &Apache::lonxml::error('Only one problem allowed in a .problem file');
249: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
250: return '';
251: }
252: #intialize globals
253: $Apache::inputtags::part='0';
254: @Apache::inputtags::responselist = ();
255: @Apache::inputtags::previous=();
256: if ($target ne 'analyze') {
257: &initialize_storage();
258: if ($target eq 'web') {
259: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
260: }
261: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
262: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
263: }
264: if ($Apache::lonhomework::type eq '') {
265: my $uri=$ENV{'request.uri'};
266: if ($uri=~/\.(\w+)$/) {
267: $Apache::lonhomework::type=$1;
268: &Apache::lonxml::debug("Using type of $1");
269: } else {
270: $Apache::lonhomework::type='problem';
271: &Apache::lonxml::debug("Using default type, problem, :$uri:");
272: }
273: }
274:
275: #added vars to the scripting enviroment
276: my $expression='$external::part='.$Apache::inputtags::part.';';
277: &Apache::run::run($expression,$safeeval);
278: my $status;
279: my $accessmsg;
280:
281: #should get back a <html> or the neccesary stuff to start XML/MathML
282: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
283: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
284: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
285:
286: if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
287: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
288: #handle exam checkout
289: if ($Apache::lonhomework::type eq 'exam') {
290: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
291: if (($ENV{'form.doescheckout'}) && (!$token)) {
292: $token=&Apache::lonxml::maketoken();
293: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
294: }
295: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
296: }
297:
298: #handle rand seed in construction space
299: my $rndseed=&setup_rndseed($safeeval);
300: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
301: push (@Apache::inputtags::status,$status);
302: my $expression='$external::datestatus="'.$status.'";';
303: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
304: &Apache::run::run($expression,$safeeval);
305: &Apache::lonxml::debug("Got $status");
306: if (( $status eq 'CLOSED' ) ||
307: ( $status eq 'UNCHECKEDOUT') ||
308: ( $status eq 'BANNED') ||
309: ( $status eq 'UNAVAILABLE')) {
310: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
311: if ( $target eq "web" ) {
312: $result.= $head_tag_start.'</head>';
313: my $msg=$body_tag_start;
314: if ($status eq 'UNAVAILABLE') {
315: $result.='<h1>Unable to determine if this resource is open due to network problems. Please try again later.</h1>';
316: } else {
317: $result.='<h1>Not open to be viewed</h1>';
318: }
319: if ($status eq 'CLOSED') {
320: $msg.='The problem '.$accessmsg;
321: } elsif ($status eq 'UNCHECKEDOUT') {
322: $msg.=&checkout_msg;
323: }
324: $result.=$msg.'<br />';
325: } elsif ($target eq 'tex') {
326: $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm ";
327: if ($status eq 'UNAVAILABLE') {
328: $result.='Unable to determine if this resource is open due to network problems. Please try again later.\vskip 0 mm ';
329: } else {
330: $result.="Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
331: }
332: }
333: } elsif ($target eq 'web') {
334: my $name= &get_resource_name($parstack,$safeeval);
335: if ($status eq 'CAN_ANSWER') {
336: # create a page header and exit
337: $result.="$head_tag_start<title>$name</title></head>
338: $body_tag_start \n $form_tag_start".
339: '<input type="hidden" name="submitted" value="yes" />';
340: if ($ENV{'request.state'} eq "construct") {
341: $result.= &problem_web_to_edit_header($rndseed);
342: }
343: # if we are viewing someone else preserve that info
344: if (defined $ENV{'form.grade_symb'}) {
345: foreach my $field ('symb','courseid','domain','username') {
346: $result .= '<input type="hidden" name="grade_'.$field.
347: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
348: }
349: }
350: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
351: || $status eq 'CLOSED' || $status eq 'UNAVALAILABLE') {
352: $result.=$head_tag_start.
353: "<title>$name</title></head>\n$body_tag_start\n";
354: }
355: } elsif ($target eq 'tex') {
356: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
357: if ($name eq '') {
358: $name=&Apache::lonnet::EXT('resource.title');
359: if ($name eq 'con_lost') { $name = ''; }
360: }
361: $Apache::lonhomework::name=$name;
362: my $id = $Apache::inputtags::part;
363: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
364: $duedate = POSIX::strftime("%c",localtime($duedate));
365: my $temp_file;
366: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
367: if (-e $filename) {
368: $temp_file = Apache::File->new($filename);
369: } else {
370: $temp_file = Apache::File->new('>>'.$filename);
371: }
372: my @due_file_content = <$temp_file>;
373: my $due_file_content = $due_file_content[$#due_file_content];
374: chomp $due_file_content;
375: if ($due_file_content ne $duedate) {
376: $temp_file = Apache::File->new('>'.$filename);
377: print $temp_file "$duedate\n";
378: if (not $ENV{'request.symb'} =~ m/\.page_/) {
379: if(not $duedate=~m/1969/) {
380: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
381: } else {
382: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
383: }
384: } else {
385: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
386: }
387: } else {
388: if (not $ENV{'request.symb'} =~ m/\.page_/) {
389: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
390: } else {
391: $result .= '\vskip 1mm \\\\\\\\';
392: }
393: }
394: }
395: } elsif ($target eq 'edit') {
396: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
397: &problem_edit_header();
398: my $temp=&Apache::edit::insertlist($target,$token);
399: $result.=$temp;
400: } elsif ($target eq 'modified') {
401: $result=$token->[4];
402: $result.=&Apache::edit::handle_insert();
403: } else {
404: # page_start returned a starting result, delete it if we don't need it
405: $result = '';
406: }
407: return $result;
408: }
409:
410: sub end_problem {
411: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
412: my $result='';
413: my $status=$Apache::inputtags::status['-1'];
414: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
415: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' && $status eq 'CAN_ANSWER' ) {
416: # if part is zero, no <part>s existed, so we need to the grading
417: &Apache::inputtags::grade;
418: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
419: $status ne 'UNCHECKEDOUT') {
420: # if part is zero, no <part>s existed, so we need show the current
421: # grading status
422: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
423: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
424: }
425: if (
426: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
427: ($target eq 'answer') || ($target eq 'tex')
428: ) {
429: if ($status eq 'CAN_ANSWER') {
430: if ($target ne 'tex') {
431: $result.="</form></body>\n";
432: }
433: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
434: $status eq 'UNCHECKEDOUT' ) {
435: if ($target ne 'tex') {
436: $result.="</body>\n";
437: }
438: }
439: if ($target eq 'web') {
440: $result.=&Apache::lonxml::xmlend();
441: } elsif ($target eq 'tex') {
442: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
443: if (not $ENV{'request.symb'} =~ m/\.page_/) {
444: $result .= '\end{minipage}\end{document} ';
445: } else {
446: $result .= '';
447: }
448: }
449: }
450: if ($target eq 'grade') {
451: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
452: &finalize_storage();
453: }
454: if ($target eq 'answer' && ($ENV{'request.state'} eq 'construct') ) {
455: $result.='</html>'; #normally we get it from xmlend, but in CSTR
456: # we always show answer mode too.
457: }
458: } elsif ($target eq 'meta') {
459: if ($Apache::inputtags::part eq '0') {
460: $result=&Apache::response::mandatory_part_meta;
461: }
462: } elsif ($target eq 'edit') {
463: &Apache::lonxml::debug("in end_problem with $target, edit");
464: $result = &problem_edit_footer();
465: }
466: return $result;
467: }
468:
469:
470: sub start_library {
471: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
472: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
473:
474: if ($target eq 'edit') {
475: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
476: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
477: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
478: &problem_edit_header();
479: my $temp=&Apache::edit::insertlist($target,$token);
480: $result.=$temp;
481: } elsif ($target eq 'modified') {
482: $result=$token->[4];
483: $result.=&Apache::edit::handle_insert();
484: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
485: $ENV{'request.state'} eq "construct" ) {
486: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
487: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
488: my $name=&get_resource_name($parstack,$safeeval);
489: my $rndseed=&setup_rndseed($safeeval);
490: $result.="$head_tag_start<title>$name</title></head>
491: $body_tag_start \n $form_tag_start".
492: '<input type="hidden" name="submitted" value="yes" />';
493: $result.=&problem_web_to_edit_header($rndseed);
494: }
495: return $result;
496: }
497:
498: sub end_library {
499: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
500: my $result='';
501: if ($target eq 'edit') {
502: $result=&problem_edit_footer();
503: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
504: $ENV{'request.state'} eq "construct") {
505: $result.='</form></body>'.&Apache::lonxml::xmlend();
506: }
507: return $result;
508: }
509:
510: sub start_block {
511: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
512:
513: my $result;
514:
515: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
516: $target eq 'tex' || $target eq 'analyze') {
517: my $code = @$parstack[$#$parstack];
518: if ($code) {
519: $code =~ s/\"//g;
520: $code .=';return $condition;';
521: if (!$Apache::lonxml::default_homework_loaded) {
522: &Apache::lonxml::default_homework_load($safeeval);
523: }
524: $result = &Apache::run::run($code,$safeeval);
525: &Apache::lonxml::debug("block :$code: returned :$result:");
526: } else {
527: $result='1';
528: }
529: if ( ! $result ) {
530: my $skip=&Apache::lonxml::get_all_text("/block",$parser);
531: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
532: }
533: $result='';
534: } elsif ($target eq 'edit') {
535: $result .=&Apache::edit::tag_start($target,$token);
536: $result .=&Apache::edit::text_arg('Test Condition:','condition',
537: $token,40);
538: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
539: } elsif ($target eq 'modified') {
540: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
541: $safeeval,'condition');
542: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
543: }
544: return $result;
545: }
546:
547: sub end_block {
548: return '';
549: }
550:
551: sub start_while {
552: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
553:
554: my $code = @$parstack[$#$parstack];
555: $code =~ s/\"//g;
556: $code .=';return $condition;';
557:
558: push( @Apache::structuretags::whileconds, $code);
559: if (!$Apache::lonxml::default_homework_loaded) {
560: &Apache::lonxml::default_homework_load($safeeval);
561: }
562: my $result = &Apache::run::run($code,$safeeval);
563: my $bodytext=$$parser[$#$parser]->get_text("/while");
564: push( @Apache::structuretags::whilebody, $bodytext);
565: if ( $result ) {
566: &Apache::lonxml::newparser($parser,\$bodytext);
567: }
568: return "";
569: }
570:
571: sub end_while {
572: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
573: my $code = pop @Apache::structuretags::whileconds;
574: my $bodytext = pop @Apache::structuretags::whilebody;
575: my $result = &Apache::run::run($code,$safeeval);
576: if ( $result ) {
577: &Apache::lonxml::newparser($parser,\$bodytext);
578: }
579: return "";
580: }
581:
582: # <randomlist show="1">
583: # <tag1>..</tag1>
584: # <tag2>..</tag2>
585: # <tag3>..</tag3>
586: # ...
587: # </randomlist>
588: sub start_randomlist {
589: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
590: my $result;
591: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
592: $target eq 'tex' || $target eq 'analyze') {
593: my $body= &Apache::lonxml::get_all_text("/randomlist",$parser);
594: my $b_parser= HTML::TokeParser->new(\$body);
595: my $b_tok;
596: my @randomlist;
597: my $list_item;
598: while($b_tok = $b_parser->get_token() ) {
599: if($b_tok->[0] eq 'S') { # start tag
600: # get content of the tag until matching end tag
601: # get all text upto the matching tag
602: # and push the content into @randomlist
603: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
604: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
605: push(@randomlist,$list_item);
606: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
607: }
608: if($b_tok->[0] eq 'T') { # text
609: # what to do with text in between tags?
610: # print "<b>TEXT $b_tok->[1]</b><br />";
611: }
612: # if($b_tok->[0] eq 'E') { # end tag, should not happen
613: # print "<b>END-TAG $b_tok->[1]</b><br />";
614: # }
615: }
616: my @idx_arr = (0 .. $#randomlist);
617: &Apache::structuretags::shuffle(\@idx_arr);
618: my $bodytext = '';
619: my $show=$#randomlist;
620: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
621: $showarg--;
622: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
623: for(0 .. $show) {
624: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
625: }
626: &Apache::lonxml::newparser($parser,\$bodytext);
627: } elsif ($target eq 'edit' ) {
628: $result .= &Apache::edit::tag_start($target,$token);
629: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
630: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
631: } elsif ($target eq 'modified' ) {
632: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
633: 'show');
634: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
635: }
636: return $result;
637: }
638:
639: sub shuffle {
640: my $a=shift;
641: my $i;
642: if (defined(@$a)) {
643: &Apache::response::setrandomnumber();
644: for($i=@$a;--$i;) {
645: my $j=int(&Math::Random::random_uniform() * ($i+1));
646: next if $i == $j;
647: @$a[$i,$j] = @$a[$j,$i];
648: }
649: }
650: }
651:
652: sub end_randomlist {
653: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
654: my $result;
655: if ($target eq 'edit' ) {
656: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
657: }
658: return $result;
659: }
660:
661: sub start_part {
662: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
663: my $result='';
664: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
665: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
666: $Apache::inputtags::part=$id;
667: @Apache::inputtags::responselist = ();
668: @Apache::inputtags::previous=();
669: my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
670:
671: if ($target eq 'meta') {
672: return &Apache::response::mandatory_part_meta;
673: } elsif ($target eq 'web' || $target eq 'grade' ||
674: $target eq 'answer' || $target eq 'tex') {
675: if ($hidden) {
676: my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
677: } else {
678: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
679: push (@Apache::inputtags::status,$status);
680: my $expression='$external::datestatus="'.$status.'";';
681: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
682: &Apache::run::run($expression,$safeeval);
683: if ( $status eq 'CLOSED' ) {
684: my $bodytext=&Apache::lonxml::get_all_text("/part",$parser);
685: if ( $target eq "web" ) {
686: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
687: } elsif ( $target eq 'tex' ) {
688: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
689: }
690: } else {
691: if ($target eq 'tex') {
692: if ($$tagstack[-2] ne 'problem') {
693: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
694: }
695: }
696: }
697: }
698: } elsif ($target eq 'edit') {
699: $result.=&Apache::edit::tag_start($target,$token);
700: $result.=&Apache::edit::text_arg('Part ID:','id',$token).
701: &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
702: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
703:
704: } elsif ($target eq 'modified') {
705: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
706: 'id');
707: if ($constructtag) {
708: $result = &Apache::edit::rebuild_tag($token);
709: $result.=&Apache::edit::handle_insert();
710: }
711: }
712: return $result;
713: }
714:
715: sub end_part {
716: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
717: &Apache::lonxml::debug("in end_part $target ");
718: my $status=$Apache::inputtags::status['-1'];
719: my $hidden=&Apache::loncommon::check_if_partid_hidden($Apache::inputtags::part);
720: my $result='';
721: if ( $target eq 'meta' ) {
722: $result='';
723: } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER' && !$hidden) {
724: $result=&Apache::inputtags::grade;
725: } elsif (($target eq 'web' || $target eq 'tex') && !$hidden ) {
726: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
727: $target);
728: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
729: $result=$gradestatus;
730: }
731: pop @Apache::inputtags::status;
732: return $result;
733: }
734:
735: sub start_preduedate {
736: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
737: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
738: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
739: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
740: $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
741: &Apache::lonxml::get_all_text("/preduedate",$parser);
742: }
743: }
744: return '';
745: }
746:
747: sub end_preduedate {
748: return '';
749: }
750:
751: sub start_postanswerdate {
752: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
753: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
754: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
755: &Apache::lonxml::get_all_text("/postanswerdate",$parser);
756: }
757: } elsif ($target eq 'tex') {
758: return '\vskip 0 mm \noindent';
759: }
760: return '';
761: }
762:
763: sub end_postanswerdate {
764: return '';
765: }
766:
767: sub start_notsolved {
768: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
769: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
770: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
771: &Apache::lonxml::debug("not solved has :$gradestatus:");
772: if ($gradestatus =~ /^correct/) {
773: &Apache::lonxml::debug("skipping");
774: &Apache::lonxml::get_all_text("/notsolved",$parser);
775: }
776: }
777: return '';
778: }
779:
780: sub end_notsolved {
781: return '';
782: }
783:
784: sub start_solved {
785: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
786: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
787: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
788: if ($gradestatus !~ /^correct/) {
789: &Apache::lonxml::get_all_text("/solved",$parser);
790: }
791: }
792: return '';
793: }
794:
795: sub end_solved {
796: return '';
797: }
798:
799: sub start_startouttext {
800: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
801: my @result=(''.'');
802: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
803: return (@result);
804: }
805: sub end_startouttext {
806: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
807: my $result='';
808: my $text='';
809:
810: if ($target eq 'edit') {
811: $text=&Apache::lonxml::get_all_text("endouttext",$parser);
812: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
813: <td>Delete:".
814: &Apache::edit::deletelist($target,$token)
815: ."</td>
816: <td>".
817: &Apache::edit::insertlist($target,$token).
818: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n"
819: .'<table><tr><td>'.
820: &Apache::loncommon::help_open_topic("Greek_Symbols",'Greek Symbols',
821: undef,undef,600)
822: .'</td><td>'.
823: &Apache::loncommon::help_open_topic("Other_Symbols",'Other Symbols',
824: undef,undef,600)
825: .'</td></tr></table>'.
826: &Apache::edit::editfield($token->[1],$text,"",80,4);
827: }
828: if ($target eq 'modified') {
829: $text=&Apache::lonxml::get_all_text("endouttext",$parser);
830: $result='<startouttext />'.&Apache::edit::modifiedfield();
831: }
832: if ($target eq 'tex') {
833: $result .= '\noindent ';
834: }
835: return $result;
836: }
837: sub start_endouttext {
838: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
839: my $result='';
840: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
841: if ($target eq "modified") {
842: $result='<endouttext />'.
843: &Apache::edit::handle_insertafter('startouttext'); }
844: return $result;
845: }
846: sub end_endouttext {
847: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
848: my @result=('','');
849: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
850: return (@result);
851: }
852: sub delete_startouttext {
853: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
854: # my $text=&Apache::lonxml::get_all_text("endouttext",$parser);
855: my $text=$$parser['-1']->get_text("/endouttext");
856: my $ntoken=$$parser['-1']->get_token();
857: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
858: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
859: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
860: # they did the last time round
861: &Apache::lonxml::increasedepth($ntoken);
862: &Apache::lonxml::decreasedepth($ntoken);
863: return 1;
864: }
865:
866: 1;
867: __END__
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