1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.133 2002/11/07 16:10:47 sakharuk 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: }
105: my $form_tag_start;
106: if (!defined($found{'form'})) {
107: $form_tag_start='<form name="lonhomework" method="POST" action="'.
108: $ENV{'request.uri'}.'">';
109: }
110: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
111: }
112:
113: sub get_resource_name {
114: my ($parstack,$safeeval)=@_;
115: my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
116: if ($name eq '') {
117: $name=&Apache::lonnet::EXT('resource.title');
118: if ($name eq 'con_lost') { $name = ''; }
119: }
120: $Apache::lonhomework::name=$name;
121: return $name;
122: }
123:
124: sub setup_rndseed {
125: my ($safeeval)=@_;
126: my $rndseed;
127: if ($ENV{'request.state'} eq "construct") {
128: $rndseed=$ENV{'form.rndseed'};
129: if (!$rndseed) {
130: $rndseed=time;
131: $ENV{'form.rndseed'}=$rndseed;
132: }
133: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
134: }
135: return $rndseed;
136: }
137:
138: sub problem_edit_header {
139: return '<input type="hidden" name="submitted" value="edit" />
140: <input type="hidden" name="problemmode" value="Edit" />
141: <input type="submit" name="problemmode" value="Discard Edits and View" />
142: <input type="submit" name="problemmode" value="EditXML" />
143: <input type="submit" name="Undo" value="undo" /> <hr />
144: <input type="submit" name="submit" value="Submit Changes" />
145: <input type="submit" name="submit" value="Submit Changes and View" /><br /><p> </p>
146: ';
147: }
148:
149: sub problem_edit_footer {
150: return '<br /><input type="submit" name="submit" value="Submit Changes and Edit" />
151: <input type="submit" name="submit" value="Submit Changes and View" />';
152: }
153:
154: sub problem_web_to_edit_header {
155: my ($rndseed)=@_;
156: my $result.='<input type="hidden" name="problemmode" value="View" />
157: <input type="submit" name="problemmode" value="Edit" />
158: <input type="submit" name="problemmode" value="EditXML" />
159: Random Seed:<input type="text" name="rndseed" width="10" value="'.
160: $rndseed.'" />
161: <input type="submit" name="changerandseed" value="Change" />
162: <input type="submit" name="resetdata" value="Reset Submissions" />
163: <input type="checkbox" name="showallfoils" ';
164: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
165: $result.= ' /> Show All Foils
166: <hr />';
167: my $numtoanalyze=$ENV{'form.numtoanalyze'};
168: if (!$numtoanalyze) { $numtoanalyze=100; }
169: #DISABLED for now.
170: #$result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
171: # <input type="text" name="numtoanalyze" value="'.
172: # $numtoanalyze.'" size="5" /> <hr />';
173: return $result;
174: }
175:
176: sub initialize_storage {
177: %Apache::lonhomework::results=();
178: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
179: if ($ENV{'request.state'} eq 'construct') {
180: %Apache::lonhomework::history=
181: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
182: my ($temp)=keys %Apache::lonhomework::history ;
183: &Apache::lonxml::debug("Return message of $temp");
184: } else {
185: %Apache::lonhomework::history=
186: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
187: }
188: #ignore error conditions
189: my ($temp)=keys %Apache::lonhomework::history ;
190: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
191: }
192:
193: # -------------------------------------------------------------finalize_storage
194: # Stores away the result has to a student's environment
195: # checks form.grade_ for specific values, other wises stores
196: # to the running users environment
197: sub finalize_storage {
198: my $result;
199: my ($temp) = keys %Apache::lonhomework::results;
200: if ( $temp ne '' ) {
201: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
202: if ($ENV{'request.state'} eq 'construct') {
203: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
204: $ENV{'request.uri'},'',$domain,$name);
205: &Apache::lonxml::debug('Construct Store return message:'.$result);
206: } else {
207: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
208: $symb,$courseid,$domain,$name);
209: &Apache::lonxml::debug('Store return message:'.$result);
210: }
211: }
212: return $result;
213: }
214:
215: sub checkout_msg {
216: return (<<ENDCHECKOUT);
217: <h2>The resource needs to be checked out</h2>
218: As a resource gets checked out, a unique timestamped ID is given to it, and a
219: permanent record is left in the system.<p />
220: <font color=red>
221: Checking out resources is subject to course policies, and may exclude future
222: credit even if done erroneously.<p />
223: </font>
224: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
225: <input type="hidden" name="doescheckout" value="yes" />
226: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
227: </form>
228: ENDCHECKOUT
229: }
230:
231: sub start_problem {
232: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
233:
234: # meta is called from lonpublisher, which doesn't uses the normal
235: # lonhomework method of parsing the file which means that inputtags
236: # won't get reset
237: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
238: &Apache::lonxml::error('Only one problem allowed in a .problem file');
239: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
240: return '';
241: }
242: #intialize globals
243: $Apache::inputtags::part='0';
244: @Apache::inputtags::responselist = ();
245: @Apache::inputtags::previous=();
246: if ($target ne 'analyze') {
247: &initialize_storage();
248: if ($target eq 'web') {
249: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
250: }
251: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
252: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
253: }
254: if ($Apache::lonhomework::type eq '') {
255: my $uri=$ENV{'request.uri'};
256: if ($uri=~/\.(\w+)$/) {
257: $Apache::lonhomework::type=$1;
258: &Apache::lonxml::debug("Using type of $1");
259: } else {
260: $Apache::lonhomework::type='problem';
261: &Apache::lonxml::debug("Using default type, problem, :$uri:");
262: }
263: }
264:
265: #added vars to the scripting enviroment
266: my $expression='$external::part='.$Apache::inputtags::part.';';
267: &Apache::run::run($expression,$safeeval);
268: my $status;
269: my $accessmsg;
270:
271: #should get back a <html> or the neccesary stuff to start XML/MathML
272: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
273: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
274: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
275:
276: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
277: #handle exam checkout
278: if ($Apache::lonhomework::type eq 'exam') {
279: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
280: if (($ENV{'form.doescheckout'}) && (!$token)) {
281: $token=&Apache::lonxml::maketoken();
282: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
283: }
284: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
285: }
286:
287: #handle rand seed in construction space
288: my $rndseed=&setup_rndseed($safeeval);
289: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
290: push (@Apache::inputtags::status,$status);
291: my $expression='$external::datestatus="'.$status.'";';
292: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
293: &Apache::run::run($expression,$safeeval);
294: &Apache::lonxml::debug("Got $status");
295: if (( $status eq 'CLOSED' ) ||
296: ( $status eq 'UNCHECKEDOUT') ||
297: ( $status eq 'BANNED')) {
298: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
299: if ( $target eq "web" ) {
300: $result.= $head_tag_start.'</head>';
301: my $msg=$body_tag_start.
302: '<h1>Not open to be viewed</h1>';
303: if ($status eq 'CLOSED') {
304: $msg.='The problem '.$accessmsg;
305: } elsif ($status eq 'UNCHECKEDOUT') {
306: $msg.=&checkout_msg;
307: }
308: $result.=$msg.'<br />';
309: } elsif ($target eq 'tex') {
310: $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 ";
311: }
312: } elsif ($target eq 'web') {
313: my $name= &get_resource_name($parstack,$safeeval);
314: if ($status eq 'CAN_ANSWER') {
315: # create a page header and exit
316: $result.="$head_tag_start<title>$name</title></head>
317: $body_tag_start \n $form_tag_start".
318: '<input type="hidden" name="submitted" value="yes" />';
319: if ($ENV{'request.state'} eq "construct") {
320: $result.= &problem_web_to_edit_header($rndseed);
321: }
322: # if we are viewing someone else preserve that info
323: if (defined $ENV{'form.grade_symb'}) {
324: foreach my $field ('symb','courseid','domain','username') {
325: $result .= '<input type="hidden" name="grade_'.$field.
326: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
327: }
328: }
329: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
330: || $status eq 'CLOSED') {
331: $result.=$head_tag_start.
332: "<title>$name</title></head>\n$body_tag_start\n";
333: }
334: } elsif ($target eq 'tex') {
335: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
336: if ($name eq '') {
337: $name=&Apache::lonnet::EXT('resource.title');
338: if ($name eq 'con_lost') { $name = ''; }
339: }
340: $Apache::lonhomework::name=$name;
341: my $id = $Apache::inputtags::part;
342: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
343: $duedate = POSIX::strftime("%c",localtime($duedate));
344: my $temp_file;
345: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
346: if (-e $filename) {
347: $temp_file = Apache::File->new($filename);
348: } else {
349: $temp_file = Apache::File->new('>>'.$filename);
350: }
351: my @due_file_content = <$temp_file>;
352: my $due_file_content = $due_file_content[$#due_file_content];
353: chomp $due_file_content;
354: if ($due_file_content ne $duedate) {
355: $temp_file = Apache::File->new('>'.$filename);
356: print $temp_file "$duedate\n";
357: if (not $ENV{'request.symb'} =~ m/\.page_/) {
358: if(not $duedate=~m/1969/) {
359: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
360: } else {
361: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
362: }
363: } else {
364: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
365: }
366: } else {
367: if (not $ENV{'request.symb'} =~ m/\.page_/) {
368: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
369: } else {
370: $result .= '\vskip 1mm \\\\\\\\';
371: }
372: }
373: }
374: } elsif ($target eq 'edit') {
375: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
376: &problem_edit_header();
377: my $temp=&Apache::edit::insertlist($target,$token);
378: $result.=$temp;
379: } elsif ($target eq 'modified') {
380: $result=$token->[4];
381: $result.=&Apache::edit::handle_insert();
382: } else {
383: # page_start returned a starting result, delete it if we don't need it
384: $result = '';
385: }
386: return $result;
387: }
388:
389: sub end_problem {
390: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
391: my $result='';
392: my $status=$Apache::inputtags::status['-1'];
393: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
394: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
395: # if part is zero, no <part>s existed, so we need to the grading
396: &Apache::inputtags::grade;
397: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
398: $status ne 'UNCHECKEDOUT') {
399: # if part is zero, no <part>s existed, so we need show the current
400: # grading status
401: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
402: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
403: }
404: if (
405: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
406: ($target eq 'answer') || ($target eq 'tex')
407: ) {
408: if ($status eq 'CAN_ANSWER') {
409: if ($target ne 'tex') {
410: $result.="</form></body>\n";
411: }
412: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
413: $status eq 'UNCHECKEDOUT' ) {
414: if ($target ne 'tex') {
415: $result.="</body>\n";
416: }
417: }
418: if ($target ne 'tex') {
419: $result.=&Apache::lonxml::xmlend();
420: } else {
421: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
422: if (not $ENV{'request.symb'} =~ m/\.page_/) {
423: $result .= '\end{minipage}\end{document} ';
424: } else {
425: $result .= '';
426: }
427: }
428: }
429: if ($target eq 'grade') {
430: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
431: &finalize_storage();
432: }
433: } elsif ($target eq 'meta') {
434: if ($Apache::inputtags::part eq '0') {
435: $result=&Apache::response::mandatory_part_meta;
436: }
437: } elsif ($target eq 'edit') {
438: &Apache::lonxml::debug("in end_problem with $target, edit");
439: $result = &problem_edit_footer();
440: }
441: return $result;
442: }
443:
444:
445: sub start_library {
446: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
447: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
448:
449: if ($target eq 'edit') {
450: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
451: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
452: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
453: &problem_edit_header();
454: my $temp=&Apache::edit::insertlist($target,$token);
455: $result.=$temp;
456: } elsif ($target eq 'modified') {
457: $result=$token->[4];
458: $result.=&Apache::edit::handle_insert();
459: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
460: $ENV{'request.state'} eq "construct" ) {
461: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
462: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
463: my $name=&get_resource_name($parstack,$safeeval);
464: my $rndseed=&setup_rndseed($safeeval);
465: $result.="$head_tag_start<title>$name</title></head>
466: $body_tag_start \n $form_tag_start".
467: '<input type="hidden" name="submitted" value="yes" />';
468: $result.=&problem_web_to_edit_header($rndseed);
469: }
470: return $result;
471: }
472:
473: sub end_library {
474: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
475: my $result='';
476: if ($target eq 'edit') {
477: $result=&problem_edit_footer();
478: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
479: $ENV{'request.state'} eq "construct") {
480: $result.='</form></body>'.&Apache::lonxml::xmlend();
481: }
482: return $result;
483: }
484:
485: sub start_block {
486: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
487:
488: my $result;
489:
490: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
491: $target eq 'tex' || $target eq 'analyze') {
492: my $code = @$parstack[$#$parstack];
493: if ($code) {
494: $code =~ s/\"//g;
495: $code .=';return $condition;';
496: $result = &Apache::run::run($code,$safeeval);
497: &Apache::lonxml::debug("block :$code: returned :$result:");
498: } else {
499: $result='1';
500: }
501: if ( ! $result ) {
502: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[-1]);
503: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
504: }
505: $result='';
506: } elsif ($target eq 'edit') {
507: $result .=&Apache::edit::tag_start($target,$token);
508: $result .=&Apache::edit::text_arg('Test Condition:','condition',
509: $token,40);
510: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
511: } elsif ($target eq 'modified') {
512: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
513: $safeeval,'condition');
514: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
515: }
516: return $result;
517: }
518:
519: sub end_block {
520: return '';
521: }
522:
523: sub start_while {
524: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
525:
526: my $code = @$parstack[$#$parstack];
527: $code =~ s/\"//g;
528: $code .=';return $condition;';
529:
530: push( @Apache::structuretags::whileconds, $code);
531: my $result = &Apache::run::run($code,$safeeval);
532: my $bodytext=$$parser[$#$parser]->get_text("/while");
533: push( @Apache::structuretags::whilebody, $bodytext);
534: if ( $result ) {
535: &Apache::lonxml::newparser($parser,\$bodytext);
536: }
537: return "";
538: }
539:
540: sub end_while {
541: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
542: my $code = pop @Apache::structuretags::whileconds;
543: my $bodytext = pop @Apache::structuretags::whilebody;
544: my $result = &Apache::run::run($code,$safeeval);
545: if ( $result ) {
546: &Apache::lonxml::newparser($parser,\$bodytext);
547: }
548: return "";
549: }
550:
551: # <randomlist show="1">
552: # <tag1>..</tag1>
553: # <tag2>..</tag2>
554: # <tag3>..</tag3>
555: # ...
556: # </randomlist>
557: sub start_randomlist {
558: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
559: my $result;
560: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
561: $target eq 'tex' || $target eq 'analyze') {
562: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
563: my $b_parser= HTML::TokeParser->new(\$body);
564: my $b_tok;
565: my @randomlist;
566: my $list_item;
567: while($b_tok = $b_parser->get_token() ) {
568: if($b_tok->[0] eq 'S') { # start tag
569: # get content of the tag until matching end tag
570: # get all text upto the matching tag
571: # and push the content into @randomlist
572: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
573: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
574: push(@randomlist,$list_item);
575: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
576: }
577: if($b_tok->[0] eq 'T') { # text
578: # what to do with text in between tags?
579: # print "<b>TEXT $b_tok->[1]</b><br />";
580: }
581: # if($b_tok->[0] eq 'E') { # end tag, should not happen
582: # print "<b>END-TAG $b_tok->[1]</b><br />";
583: # }
584: }
585: my @idx_arr = (0 .. $#randomlist);
586: &Apache::structuretags::shuffle(\@idx_arr);
587: my $bodytext = '';
588: my $show=$#randomlist;
589: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
590: $showarg--;
591: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
592: for(0 .. $show) {
593: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
594: }
595: &Apache::lonxml::newparser($parser,\$bodytext);
596: } elsif ($target eq 'edit' ) {
597: $result .= &Apache::edit::tag_start($target,$token);
598: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
599: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
600: } elsif ($target eq 'modified' ) {
601: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
602: 'show');
603: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
604: }
605: return $result;
606: }
607:
608: sub shuffle {
609: my $a=shift;
610: my $i;
611: if (defined(@$a)) {
612: &Apache::response::setrandomnumber();
613: for($i=@$a;--$i;) {
614: my $j=int(&Math::Random::random_uniform() * ($i+1));
615: next if $i == $j;
616: @$a[$i,$j] = @$a[$j,$i];
617: }
618: }
619: }
620:
621: sub end_randomlist {
622: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
623: my $result;
624: if ($target eq 'edit' ) {
625: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
626: }
627: return $result;
628: }
629:
630: sub start_part {
631: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
632: my $result='';
633: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
634: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
635: $Apache::inputtags::part=$id;
636: @Apache::inputtags::responselist = ();
637: @Apache::inputtags::previous=();
638: if ($target eq 'meta') {
639: return &Apache::response::mandatory_part_meta;
640: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
641: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
642: push (@Apache::inputtags::status,$status);
643: my $expression='$external::datestatus="'.$status.'";';
644: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
645: &Apache::run::run($expression,$safeeval);
646: if ( $status eq 'CLOSED' ) {
647: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
648: if ( $target eq "web" ) {
649: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
650: } elsif ( $target eq 'tex' ) {
651: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
652: }
653: } else {
654: if ($target eq 'tex') {
655: if ($$tagstack[-2] ne 'problem') {
656: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
657: }
658: }
659: }
660: }
661: return $result;
662: }
663:
664: sub end_part {
665: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
666: &Apache::lonxml::debug("in end_part $target ");
667: my $status=$Apache::inputtags::status['-1'];
668: pop @Apache::inputtags::status;
669: if ( $target eq 'meta' ) { return ''; }
670: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
671: return &Apache::inputtags::grade;
672: }
673: if ($target eq 'web' || $target eq 'tex' ) {
674: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
675: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
676: return $gradestatus;
677: }
678: return '';
679: }
680:
681: sub start_preduedate {
682: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
683: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
684: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
685: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
686: $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
687: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
688: }
689: }
690: return '';
691: }
692:
693: sub end_preduedate {
694: return '';
695: }
696:
697: sub start_postanswerdate {
698: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
699: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
700: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
701: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
702: }
703: } elsif ($target eq 'tex') {
704: return '\vskip 0 mm \noindent';
705: }
706: return '';
707: }
708:
709: sub end_postanswerdate {
710: return '';
711: }
712:
713: sub start_notsolved {
714: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
715: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
716: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
717: &Apache::lonxml::debug("not solved has :$gradestatus:");
718: if ($gradestatus =~ /^correct/) {
719: &Apache::lonxml::debug("skipping");
720: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
721: }
722: }
723: return '';
724: }
725:
726: sub end_notsolved {
727: return '';
728: }
729:
730: sub start_solved {
731: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
732: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
733: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
734: if ($gradestatus !~ /^correct/) {
735: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
736: }
737: }
738: return '';
739: }
740:
741: sub end_solved {
742: return '';
743: }
744:
745: sub start_startouttext {
746: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
747: my @result=(''.'');
748: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
749: return (@result);
750: }
751: sub end_startouttext {
752: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
753: my $result='';
754: my $text='';
755:
756: if ($target eq 'edit') {
757: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
758: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
759: <td>Delete:".
760: &Apache::edit::deletelist($target,$token)
761: ."</td>
762: <td>".
763: &Apache::edit::insertlist($target,$token).
764: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
765: &Apache::edit::editfield($token->[1],$text,"",80,4);
766: }
767: if ($target eq 'modified') {
768: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
769: $result='<startouttext />'.&Apache::edit::modifiedfield();
770: }
771: if ($target eq 'tex') {
772: $result .= '\noindent ';
773: }
774: return $result;
775: }
776: sub start_endouttext {
777: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
778: my $result='';
779: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
780: if ($target eq "modified") {
781: $result='<endouttext />'.
782: &Apache::edit::handle_insertafter('startouttext'); }
783: return $result;
784: }
785: sub end_endouttext {
786: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
787: my @result=('','');
788: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
789: return (@result);
790: }
791: sub delete_startouttext {
792: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
793: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
794: my $text=$$parser['-1']->get_text("/endouttext");
795: my $ntoken=$$parser['-1']->get_token();
796: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
797: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
798: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
799: # they did the last time round
800: &Apache::lonxml::increasedepth($ntoken);
801: &Apache::lonxml::decreasedepth($ntoken);
802: return 1;
803: }
804:
805: 1;
806: __END__
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