1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.139 2002/11/25 21:19:45 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:
39: BEGIN {
40: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
41: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
42: }
43:
44: sub start_web {
45: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
46: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
47: if ($target eq 'web') {
48: return $bodytext;
49: }
50: return '';
51: }
52:
53: sub end_web {
54: return '';
55: }
56:
57: sub start_tex {
58: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
59: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
60: if ($target eq 'tex') {
61: return $bodytext.' ';
62: }
63: return '';
64: }
65:
66: sub end_tex {
67: return '';
68: }
69:
70: sub page_start {
71: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
72: my %found;
73: foreach my $taginside ($tagstack) {
74: foreach my $taglookedfor ('html','body','form') {
75: if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
76: }
77: }
78:
79: my $result;
80: my $head_tag_start;
81: if (!defined($found{'html'})) {
82: $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
83: $parser,$safeeval);
84: $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);
85: }
86: my $body_tag_start;
87: if (!defined($found{'body'})) {
88: $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
89: 'onUnload="'.&Apache::lonxml::unloadevents().'" ';
90: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
91: if ($background) {
92: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
93: $background;
94: $body_tag_start.='background="'.$background.'" ';
95: } else {
96: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
97: if ($bgcolor) {
98: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
99: } else {
100: $body_tag_start.='bgcolor="#ffffff"';
101: }
102: }
103: $body_tag_start.='>';
104: if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
105: my ($symb)=&Apache::lonxml::whichuser();
106: if ($symb eq '') {
107: my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
108: $help="Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />";
109: $body_tag_start.=$help;
110: }
111: }
112: }
113: my $form_tag_start;
114: if (!defined($found{'form'})) {
115: $form_tag_start='<form name="lonhomework" method="POST" action="'.
116: $ENV{'request.uri'}.'">';
117: }
118: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
119: }
120:
121: use Time::HiRes();
122: sub get_resource_name {
123: my ($parstack,$safeeval)=@_;
124: my $name=&Apache::lonnet::gettitle();
125: &Apache::lonnet::logthis("Got $name");
126: if ($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[-1]);
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: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
310: if ( $target eq "web" ) {
311: $result.= $head_tag_start.'</head>';
312: my $msg=$body_tag_start.
313: '<h1>Not open to be viewed</h1>';
314: if ($status eq 'CLOSED') {
315: $msg.='The problem '.$accessmsg;
316: } elsif ($status eq 'UNCHECKEDOUT') {
317: $msg.=&checkout_msg;
318: }
319: $result.=$msg.'<br />';
320: } elsif ($target eq 'tex') {
321: $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
322: }
323: } elsif ($target eq 'web') {
324: my $name= &get_resource_name($parstack,$safeeval);
325: if ($status eq 'CAN_ANSWER') {
326: # create a page header and exit
327: $result.="$head_tag_start<title>$name</title></head>
328: $body_tag_start \n $form_tag_start".
329: '<input type="hidden" name="submitted" value="yes" />';
330: if ($ENV{'request.state'} eq "construct") {
331: $result.= &problem_web_to_edit_header($rndseed);
332: }
333: # if we are viewing someone else preserve that info
334: if (defined $ENV{'form.grade_symb'}) {
335: foreach my $field ('symb','courseid','domain','username') {
336: $result .= '<input type="hidden" name="grade_'.$field.
337: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
338: }
339: }
340: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
341: || $status eq 'CLOSED') {
342: $result.=$head_tag_start.
343: "<title>$name</title></head>\n$body_tag_start\n";
344: }
345: } elsif ($target eq 'tex') {
346: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
347: if ($name eq '') {
348: $name=&Apache::lonnet::EXT('resource.title');
349: if ($name eq 'con_lost') { $name = ''; }
350: }
351: $Apache::lonhomework::name=$name;
352: my $id = $Apache::inputtags::part;
353: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
354: $duedate = POSIX::strftime("%c",localtime($duedate));
355: my $temp_file;
356: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
357: if (-e $filename) {
358: $temp_file = Apache::File->new($filename);
359: } else {
360: $temp_file = Apache::File->new('>>'.$filename);
361: }
362: my @due_file_content = <$temp_file>;
363: my $due_file_content = $due_file_content[$#due_file_content];
364: chomp $due_file_content;
365: if ($due_file_content ne $duedate) {
366: $temp_file = Apache::File->new('>'.$filename);
367: print $temp_file "$duedate\n";
368: if (not $ENV{'request.symb'} =~ m/\.page_/) {
369: if(not $duedate=~m/1969/) {
370: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
371: } else {
372: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
373: }
374: } else {
375: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
376: }
377: } else {
378: if (not $ENV{'request.symb'} =~ m/\.page_/) {
379: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
380: } else {
381: $result .= '\vskip 1mm \\\\\\\\';
382: }
383: }
384: }
385: } elsif ($target eq 'edit') {
386: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
387: &problem_edit_header();
388: my $temp=&Apache::edit::insertlist($target,$token);
389: $result.=$temp;
390: } elsif ($target eq 'modified') {
391: $result=$token->[4];
392: $result.=&Apache::edit::handle_insert();
393: } else {
394: # page_start returned a starting result, delete it if we don't need it
395: $result = '';
396: }
397: return $result;
398: }
399:
400: sub end_problem {
401: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
402: my $result='';
403: my $status=$Apache::inputtags::status['-1'];
404: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
405: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
406: # if part is zero, no <part>s existed, so we need to the grading
407: &Apache::inputtags::grade;
408: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
409: $status ne 'UNCHECKEDOUT') {
410: # if part is zero, no <part>s existed, so we need show the current
411: # grading status
412: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
413: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
414: }
415: if (
416: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
417: ($target eq 'answer') || ($target eq 'tex')
418: ) {
419: if ($status eq 'CAN_ANSWER') {
420: if ($target ne 'tex') {
421: $result.="</form></body>\n";
422: }
423: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
424: $status eq 'UNCHECKEDOUT' ) {
425: if ($target ne 'tex') {
426: $result.="</body>\n";
427: }
428: }
429: if ($target ne 'tex') {
430: $result.=&Apache::lonxml::xmlend();
431: } else {
432: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
433: if (not $ENV{'request.symb'} =~ m/\.page_/) {
434: $result .= '\end{minipage}\end{document} ';
435: } else {
436: $result .= '';
437: }
438: }
439: }
440: if ($target eq 'grade') {
441: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
442: &finalize_storage();
443: }
444: } elsif ($target eq 'meta') {
445: if ($Apache::inputtags::part eq '0') {
446: $result=&Apache::response::mandatory_part_meta;
447: }
448: } elsif ($target eq 'edit') {
449: &Apache::lonxml::debug("in end_problem with $target, edit");
450: $result = &problem_edit_footer();
451: }
452: return $result;
453: }
454:
455:
456: sub start_library {
457: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
458: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
459:
460: if ($target eq 'edit') {
461: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
462: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
463: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
464: &problem_edit_header();
465: my $temp=&Apache::edit::insertlist($target,$token);
466: $result.=$temp;
467: } elsif ($target eq 'modified') {
468: $result=$token->[4];
469: $result.=&Apache::edit::handle_insert();
470: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
471: $ENV{'request.state'} eq "construct" ) {
472: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
473: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
474: my $name=&get_resource_name($parstack,$safeeval);
475: my $rndseed=&setup_rndseed($safeeval);
476: $result.="$head_tag_start<title>$name</title></head>
477: $body_tag_start \n $form_tag_start".
478: '<input type="hidden" name="submitted" value="yes" />';
479: $result.=&problem_web_to_edit_header($rndseed);
480: }
481: return $result;
482: }
483:
484: sub end_library {
485: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
486: my $result='';
487: if ($target eq 'edit') {
488: $result=&problem_edit_footer();
489: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
490: $ENV{'request.state'} eq "construct") {
491: $result.='</form></body>'.&Apache::lonxml::xmlend();
492: }
493: return $result;
494: }
495:
496: sub start_block {
497: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
498:
499: my $result;
500:
501: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
502: $target eq 'tex' || $target eq 'analyze') {
503: my $code = @$parstack[$#$parstack];
504: if ($code) {
505: $code =~ s/\"//g;
506: $code .=';return $condition;';
507: if (!$Apache::lonxml::default_homework_loaded) {
508: &Apache::lonxml::default_homework_load($safeeval);
509: }
510: $result = &Apache::run::run($code,$safeeval);
511: &Apache::lonxml::debug("block :$code: returned :$result:");
512: } else {
513: $result='1';
514: }
515: if ( ! $result ) {
516: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[-1]);
517: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
518: }
519: $result='';
520: } elsif ($target eq 'edit') {
521: $result .=&Apache::edit::tag_start($target,$token);
522: $result .=&Apache::edit::text_arg('Test Condition:','condition',
523: $token,40);
524: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
525: } elsif ($target eq 'modified') {
526: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
527: $safeeval,'condition');
528: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
529: }
530: return $result;
531: }
532:
533: sub end_block {
534: return '';
535: }
536:
537: sub start_while {
538: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
539:
540: my $code = @$parstack[$#$parstack];
541: $code =~ s/\"//g;
542: $code .=';return $condition;';
543:
544: push( @Apache::structuretags::whileconds, $code);
545: if (!$Apache::lonxml::default_homework_loaded) {
546: &Apache::lonxml::default_homework_load($safeeval);
547: }
548: my $result = &Apache::run::run($code,$safeeval);
549: my $bodytext=$$parser[$#$parser]->get_text("/while");
550: push( @Apache::structuretags::whilebody, $bodytext);
551: if ( $result ) {
552: &Apache::lonxml::newparser($parser,\$bodytext);
553: }
554: return "";
555: }
556:
557: sub end_while {
558: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
559: my $code = pop @Apache::structuretags::whileconds;
560: my $bodytext = pop @Apache::structuretags::whilebody;
561: my $result = &Apache::run::run($code,$safeeval);
562: if ( $result ) {
563: &Apache::lonxml::newparser($parser,\$bodytext);
564: }
565: return "";
566: }
567:
568: # <randomlist show="1">
569: # <tag1>..</tag1>
570: # <tag2>..</tag2>
571: # <tag3>..</tag3>
572: # ...
573: # </randomlist>
574: sub start_randomlist {
575: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
576: my $result;
577: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
578: $target eq 'tex' || $target eq 'analyze') {
579: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
580: my $b_parser= HTML::TokeParser->new(\$body);
581: my $b_tok;
582: my @randomlist;
583: my $list_item;
584: while($b_tok = $b_parser->get_token() ) {
585: if($b_tok->[0] eq 'S') { # start tag
586: # get content of the tag until matching end tag
587: # get all text upto the matching tag
588: # and push the content into @randomlist
589: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
590: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
591: push(@randomlist,$list_item);
592: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
593: }
594: if($b_tok->[0] eq 'T') { # text
595: # what to do with text in between tags?
596: # print "<b>TEXT $b_tok->[1]</b><br />";
597: }
598: # if($b_tok->[0] eq 'E') { # end tag, should not happen
599: # print "<b>END-TAG $b_tok->[1]</b><br />";
600: # }
601: }
602: my @idx_arr = (0 .. $#randomlist);
603: &Apache::structuretags::shuffle(\@idx_arr);
604: my $bodytext = '';
605: my $show=$#randomlist;
606: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
607: $showarg--;
608: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
609: for(0 .. $show) {
610: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
611: }
612: &Apache::lonxml::newparser($parser,\$bodytext);
613: } elsif ($target eq 'edit' ) {
614: $result .= &Apache::edit::tag_start($target,$token);
615: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
616: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
617: } elsif ($target eq 'modified' ) {
618: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
619: 'show');
620: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
621: }
622: return $result;
623: }
624:
625: sub shuffle {
626: my $a=shift;
627: my $i;
628: if (defined(@$a)) {
629: &Apache::response::setrandomnumber();
630: for($i=@$a;--$i;) {
631: my $j=int(&Math::Random::random_uniform() * ($i+1));
632: next if $i == $j;
633: @$a[$i,$j] = @$a[$j,$i];
634: }
635: }
636: }
637:
638: sub end_randomlist {
639: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
640: my $result;
641: if ($target eq 'edit' ) {
642: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
643: }
644: return $result;
645: }
646:
647: sub start_part {
648: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
649: my $result='';
650: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
651: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
652: $Apache::inputtags::part=$id;
653: @Apache::inputtags::responselist = ();
654: @Apache::inputtags::previous=();
655: if ($target eq 'meta') {
656: return &Apache::response::mandatory_part_meta;
657: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
658: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
659: push (@Apache::inputtags::status,$status);
660: my $expression='$external::datestatus="'.$status.'";';
661: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
662: &Apache::run::run($expression,$safeeval);
663: if ( $status eq 'CLOSED' ) {
664: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
665: if ( $target eq "web" ) {
666: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
667: } elsif ( $target eq 'tex' ) {
668: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
669: }
670: } else {
671: if ($target eq 'tex') {
672: if ($$tagstack[-2] ne 'problem') {
673: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
674: }
675: }
676: }
677: } elsif ($target eq 'edit') {
678: $result.=&Apache::edit::tag_start($target,$token);
679: $result.=&Apache::edit::text_arg('Part ID:','id',$token).
680: &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
681: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
682:
683: } elsif ($target eq 'modified') {
684: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
685: 'id');
686: if ($constructtag) {
687: $result = &Apache::edit::rebuild_tag($token);
688: $result.=&Apache::edit::handle_insert();
689: }
690: }
691: return $result;
692: }
693:
694: sub end_part {
695: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
696: &Apache::lonxml::debug("in end_part $target ");
697: my $status=$Apache::inputtags::status['-1'];
698: my $result='';
699: if ( $target eq 'meta' ) {
700: $result='';
701: } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
702: $result=&Apache::inputtags::grade;
703: } elsif ($target eq 'web' || $target eq 'tex' ) {
704: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
705: $target);
706: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
707: $result=$gradestatus;
708: }
709: pop @Apache::inputtags::status;
710: return $result;
711: }
712:
713: sub start_preduedate {
714: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
715: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
716: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
717: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
718: $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
719: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
720: }
721: }
722: return '';
723: }
724:
725: sub end_preduedate {
726: return '';
727: }
728:
729: sub start_postanswerdate {
730: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
731: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
732: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
733: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
734: }
735: } elsif ($target eq 'tex') {
736: return '\vskip 0 mm \noindent';
737: }
738: return '';
739: }
740:
741: sub end_postanswerdate {
742: return '';
743: }
744:
745: sub start_notsolved {
746: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
747: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
748: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
749: &Apache::lonxml::debug("not solved has :$gradestatus:");
750: if ($gradestatus =~ /^correct/) {
751: &Apache::lonxml::debug("skipping");
752: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
753: }
754: }
755: return '';
756: }
757:
758: sub end_notsolved {
759: return '';
760: }
761:
762: sub start_solved {
763: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
764: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
765: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
766: if ($gradestatus !~ /^correct/) {
767: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
768: }
769: }
770: return '';
771: }
772:
773: sub end_solved {
774: return '';
775: }
776:
777: sub start_startouttext {
778: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
779: my @result=(''.'');
780: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
781: return (@result);
782: }
783: sub end_startouttext {
784: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
785: my $result='';
786: my $text='';
787:
788: if ($target eq 'edit') {
789: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
790: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
791: <td>Delete:".
792: &Apache::edit::deletelist($target,$token)
793: ."</td>
794: <td>".
795: &Apache::edit::insertlist($target,$token).
796: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
797: &Apache::edit::editfield($token->[1],$text,"",80,4);
798: }
799: if ($target eq 'modified') {
800: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
801: $result='<startouttext />'.&Apache::edit::modifiedfield();
802: }
803: if ($target eq 'tex') {
804: $result .= '\noindent ';
805: }
806: return $result;
807: }
808: sub start_endouttext {
809: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
810: my $result='';
811: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
812: if ($target eq "modified") {
813: $result='<endouttext />'.
814: &Apache::edit::handle_insertafter('startouttext'); }
815: return $result;
816: }
817: sub end_endouttext {
818: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
819: my @result=('','');
820: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
821: return (@result);
822: }
823: sub delete_startouttext {
824: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
825: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
826: my $text=$$parser['-1']->get_text("/endouttext");
827: my $ntoken=$$parser['-1']->get_token();
828: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
829: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
830: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
831: # they did the last time round
832: &Apache::lonxml::increasedepth($ntoken);
833: &Apache::lonxml::decreasedepth($ntoken);
834: return 1;
835: }
836:
837: 1;
838: __END__
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