1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.126 2002/10/14 20:48:36 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: package Apache::structuretags;
33:
34: use strict;
35: use Apache::lonnet;
36: use Apache::File();
37:
38: BEGIN {
39: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
40: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
41: }
42:
43: sub start_web {
44: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
45: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
46: if ($target eq 'web') {
47: return $bodytext;
48: }
49: return '';
50: }
51:
52: sub end_web {
53: return '';
54: }
55:
56: sub start_tex {
57: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
58: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
59: if ($target eq 'tex') {
60: return $bodytext.' ';
61: }
62: return '';
63: }
64:
65: sub end_tex {
66: return '';
67: }
68:
69: sub page_start {
70: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
71: my %found;
72: foreach my $taginside ($tagstack) {
73: foreach my $taglookedfor ('html','body','form') {
74: if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
75: }
76: }
77:
78: my $result;
79: my $head_tag_start;
80: if (!defined($found{'html'})) {
81: $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
82: $parser,$safeeval);
83: $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);
84: }
85: my $body_tag_start;
86: if (!defined($found{'body'})) {
87: $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
88: 'onUnload="'.&Apache::lonxml::unloadevents().'" ';
89: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
90: if ($background) {
91: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
92: $background;
93: $body_tag_start.='background="'.$background.'" ';
94: } else {
95: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
96: if ($bgcolor) {
97: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
98: } else {
99: $body_tag_start.='bgcolor="#ffffff"';
100: }
101: }
102: $body_tag_start.='>';
103: }
104: my $form_tag_start;
105: if (!defined($found{'form'})) {
106: $form_tag_start='<form name="lonhomework" method="POST" action="'.
107: $ENV{'request.uri'}.'">';
108: }
109: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
110: }
111:
112: sub get_resource_name {
113: my ($parstack,$safeeval)=@_;
114: my $name=&Apache::lonxml::get_param('name',$parstack,$safeeval);
115: if ($name eq '') {
116: $name=&Apache::lonnet::EXT('resource.title');
117: if ($name eq 'con_lost') { $name = ''; }
118: }
119: $Apache::lonhomework::name=$name;
120: return $name;
121: }
122:
123: sub setup_rndseed {
124: my ($safeeval)=@_;
125: my $rndseed;
126: if ($ENV{'request.state'} eq "construct") {
127: $rndseed=$ENV{'form.rndseed'};
128: if (!$rndseed) {
129: $rndseed=time;
130: $ENV{'form.rndseed'}=$rndseed;
131: }
132: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
133: }
134: return $rndseed;
135: }
136:
137: sub problem_edit_header {
138: return '<input type="hidden" name="submitted" value="edit" />
139: <input type="hidden" name="problemmode" value="Edit" />
140: <input type="submit" name="problemmode" value="Discard Edits and View" />
141: <input type="submit" name="problemmode" value="EditXML" />
142: <input type="submit" name="Undo" value="undo" /> <hr />
143: <input type="submit" name="submit" value="Submit Changes" />
144: <input type="submit" name="submit" value="Submit Changes and View" /><br />
145: ';
146: }
147:
148: sub problem_edit_footer {
149: return '<br /><input type="submit" name="submit" value="Submit Changes and Edit" />
150: <input type="submit" name="submit" value="Submit Changes and View" />';
151: }
152:
153: sub problem_web_to_edit_header {
154: my ($rndseed)=@_;
155: my $result.='<input type="hidden" name="problemmode" value="View" />
156: <input type="submit" name="problemmode" value="Edit" />
157: <input type="submit" name="problemmode" value="EditXML" />
158: Random Seed:<input type="text" name="rndseed" width="10" value="'.
159: $rndseed.'" />
160: <input type="submit" name="changerandseed" value="Change" />
161: <input type="submit" name="resetdata" value="Reset Submissions" />
162: <input type="checkbox" name="showallfoils" ';
163: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
164: $result.= ' /> Show All Foils
165: <hr />';
166: my $numtoanalyze=$ENV{'form.numtoanalyze'};
167: if (!$numtoanalyze) { $numtoanalyze=100; }
168: #DISABLED for now.
169: #$result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
170: # <input type="text" name="numtoanalyze" value="'.
171: # $numtoanalyze.'" size="5" /> <hr />';
172: }
173:
174: sub initialize_storage {
175: %Apache::lonhomework::results=();
176: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
177: if ($ENV{'request.state'} eq 'construct') {
178: %Apache::lonhomework::history=
179: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
180: my ($temp)=keys %Apache::lonhomework::history ;
181: &Apache::lonxml::debug("Return message of $temp");
182: } else {
183: %Apache::lonhomework::history=
184: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
185: }
186: #ignore error conditions
187: my ($temp)=keys %Apache::lonhomework::history ;
188: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
189: }
190:
191: # -------------------------------------------------------------finalize_storage
192: # Stores away the result has to a student's environment
193: # checks form.grade_ for specific values, other wises stores
194: # to the running users environment
195: sub finalize_storage {
196: my $result;
197: my ($temp) = keys %Apache::lonhomework::results;
198: if ( $temp ne '' ) {
199: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
200: if ($ENV{'request.state'} eq 'construct') {
201: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
202: $ENV{'request.uri'},'',$domain,$name);
203: &Apache::lonxml::debug('Construct Store return message:'.$result);
204: } else {
205: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
206: $symb,$courseid,$domain,$name);
207: &Apache::lonxml::debug('Store return message:'.$result);
208: }
209: }
210: return $result;
211: }
212:
213: sub checkout_msg {
214: return (<<ENDCHECKOUT);
215: <h2>The resource needs to be checked out</h2>
216: As a resource gets checked out, a unique timestamped ID is given to it, and a
217: permanent record is left in the system.<p />
218: <font color=red>
219: Checking out resources is subject to course policies, and may exclude future
220: credit even if done erroneously.<p />
221: </font>
222: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
223: <input type="hidden" name="doescheckout" value="yes" />
224: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
225: </form>
226: ENDCHECKOUT
227: }
228:
229: sub start_problem {
230: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
231:
232: # meta is called from lonpublisher, which doesn't uses the normal
233: # lonhomework method of parsing the file which means that inputtags
234: # won't get reset
235: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
236: &Apache::lonxml::error('Only one problem allowed in a .problem file');
237: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
238: return '';
239: }
240: #intialize globals
241: $Apache::inputtags::part='0';
242: @Apache::inputtags::responselist = ();
243: @Apache::inputtags::previous=();
244: if ($target ne 'analyze') {
245: &initialize_storage();
246: if ($target eq 'web') {
247: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
248: }
249: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
250: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
251: }
252: if ($Apache::lonhomework::type eq '') {
253: my $uri=$ENV{'request.uri'};
254: if ($uri=~/\.(\w+)$/) {
255: $Apache::lonhomework::type=$1;
256: &Apache::lonxml::debug("Using type of $1");
257: } else {
258: $Apache::lonhomework::type='problem';
259: &Apache::lonxml::debug("Using default type, problem, :$uri:");
260: }
261: }
262:
263: #added vars to the scripting enviroment
264: my $expression='$external::part='.$Apache::inputtags::part.';';
265: &Apache::run::run($expression,$safeeval);
266: my $status;
267: my $accessmsg;
268:
269: #should get back a <html> or the neccesary stuff to start XML/MathML
270: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
271: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
272: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
273:
274: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
275: #handle exam checkout
276: if ($Apache::lonhomework::type eq 'exam') {
277: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
278: if (($ENV{'form.doescheckout'}) && (!$token)) {
279: $token=&Apache::lonxml::maketoken();
280: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
281: }
282: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
283: }
284:
285: #handle rand seed in construction space
286: my $rndseed=&setup_rndseed($safeeval);
287: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
288: push (@Apache::inputtags::status,$status);
289: my $expression='$external::datestatus="'.$status.'";';
290: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
291: &Apache::run::run($expression,$safeeval);
292: if (( $status eq 'CLOSED' ) ||
293: ( $status eq 'UNCHECKEDOUT') ||
294: ( $status eq 'BANNED')) {
295: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
296: if ( $target eq "web" ) {
297: $result.= $head_tag_start.'</head>';
298: my $msg=$body_tag_start.
299: '<h1>Not open to be viewed</h1>';
300: if ($status eq 'CLOSED') {
301: $msg.='The problem '.$accessmsg;
302: } elsif ($status eq 'UNCHECKEDOUT') {
303: $msg.=&checkout_msg;
304: }
305: $result.=$msg.'<br />';
306: } elsif ($target eq 'tex') {
307: $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
308: }
309: } elsif ($target eq 'web') {
310: my $name= &get_resource_name($parstack,$safeeval);
311: if ($status eq 'CAN_ANSWER') {
312: # create a page header and exit
313: $result.="$head_tag_start<title>$name</title></head>
314: $body_tag_start \n $form_tag_start".
315: '<input type="hidden" name="submitted" value="yes" />';
316: if ($ENV{'request.state'} eq "construct") {
317: $result.= &problem_web_to_edit_header($rndseed);
318: }
319: # if we are viewing someone else preserve that info
320: if (defined $ENV{'form.grade_symb'}) {
321: foreach my $field ('symb','courseid','domain','username') {
322: $result .= '<input type="hidden" name="grade_'.$field.
323: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
324: }
325: }
326: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
327: || $status eq 'CLOSED') {
328: $result.=$head_tag_start.
329: "<title>$name</title></head>\n$body_tag_start\n";
330: }
331: } elsif ($target eq 'tex') {
332: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
333: if ($name eq '') {
334: $name=&Apache::lonnet::EXT('resource.title');
335: if ($name eq 'con_lost') { $name = ''; }
336: }
337: $Apache::lonhomework::name=$name;
338: my $id = $Apache::inputtags::part;
339: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
340: $duedate = POSIX::strftime("%c",localtime($duedate));
341: my $temp_file;
342: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
343: if (-e $filename) {
344: $temp_file = Apache::File->new($filename);
345: } else {
346: $temp_file = Apache::File->new('>>'.$filename);
347: }
348: my @due_file_content = <$temp_file>;
349: my $due_file_content = $due_file_content[$#due_file_content];
350: chomp $due_file_content;
351: if ($due_file_content ne $duedate) {
352: $temp_file = Apache::File->new('>'.$filename);
353: print $temp_file "$duedate\n";
354: if (not $ENV{'request.symb'} =~ m/\.page_/) {
355: if(not $duedate=~m/1969/) {
356: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
357: } else {
358: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
359: }
360: } else {
361: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
362: }
363: } else {
364: if (not $ENV{'request.symb'} =~ m/\.page_/) {
365: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
366: } else {
367: $result .= '\vskip 1mm \\\\\\\\';
368: }
369: }
370: }
371: } elsif ($target eq 'edit') {
372: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
373: &problem_edit_header();
374: my $temp=&Apache::edit::insertlist($target,$token);
375: $result.=$temp;
376: } elsif ($target eq 'modified') {
377: $result=$token->[4];
378: $result.=&Apache::edit::handle_insert();
379: } else {
380: # page_start returned a starting result, delete it if we don't need it
381: $result = '';
382: }
383: return $result;
384: }
385:
386: sub end_problem {
387: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
388: my $result='';
389: my $status=$Apache::inputtags::status['-1'];
390: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
391: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
392: # if part is zero, no <part>s existed, so we need to the grading
393: &Apache::inputtags::grade;
394: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
395: $status ne 'UNCHECKEDOUT') {
396: # if part is zero, no <part>s existed, so we need show the current
397: # grading status
398: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
399: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
400: }
401: if (
402: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
403: ($target eq 'answer') || ($target eq 'tex')
404: ) {
405: if ($status eq 'CAN_ANSWER') {
406: if ($target ne 'tex') {
407: $result.="</form></body>\n";
408: }
409: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
410: $status eq 'UNCHECKEDOUT' ) {
411: if ($target ne 'tex') {
412: $result.="</body>\n";
413: }
414: }
415: if ($target ne 'tex') {
416: $result.=&Apache::lonxml::xmlend();
417: } else {
418: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
419: if (not $ENV{'request.symb'} =~ m/\.page_/) {
420: $result .= '\end{minipage}\end{document} ';
421: } else {
422: $result .= '';
423: }
424: }
425: }
426: if ($target eq 'grade') {
427: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
428: &finalize_storage();
429: }
430: } elsif ($target eq 'meta') {
431: if ($Apache::inputtags::part eq '0') {
432: $result=&Apache::response::mandatory_part_meta;
433: }
434: } elsif ($target eq 'edit') {
435: &Apache::lonxml::debug("in end_problem with $target, edit");
436: $result = &problem_edit_footer();
437: }
438: return $result;
439: }
440:
441:
442: sub start_library {
443: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
444: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
445:
446: if ($target eq 'edit') {
447: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
448: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
449: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
450: &problem_edit_header();
451: my $temp=&Apache::edit::insertlist($target,$token);
452: $result.=$temp;
453: } elsif ($target eq 'modified') {
454: $result=$token->[4];
455: $result.=&Apache::edit::handle_insert();
456: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
457: $ENV{'request.state'} eq "construct" ) {
458: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
459: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
460: my $name=&get_resource_name($parstack,$safeeval);
461: my $rndseed=&setup_rndseed($safeeval);
462: $result.="$head_tag_start<title>$name</title></head>
463: $body_tag_start \n $form_tag_start".
464: '<input type="hidden" name="submitted" value="yes" />';
465: $result.=&problem_web_to_edit_header($rndseed);
466: }
467: return $result;
468: }
469:
470: sub end_library {
471: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
472: my $result='';
473: if ($target eq 'edit') {
474: $result=&problem_edit_footer();
475: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
476: $ENV{'request.state'} eq "construct") {
477: $result.='</form></body>'.&Apache::lonxml::xmlend();
478: }
479: return $result;
480: }
481:
482: sub start_block {
483: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
484:
485: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex' || $targer eq 'analyze') {
486: my $code = @$parstack[$#$parstack];
487: $code =~ s/\"//g;
488: $code .=';return $condition;';
489: # print "<br />$code<br />";
490: my $result = &Apache::run::run($code,$safeeval);
491: &Apache::lonxml::debug("block :$code: returned :$result:");
492: if ( ! $result ) {
493: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
494: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
495: }
496: }
497: return "";
498: }
499:
500: sub end_block {
501: return '';
502: }
503:
504: sub start_while {
505: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
506:
507: my $code = @$parstack[$#$parstack];
508: $code =~ s/\"//g;
509: $code .=';return $condition;';
510:
511: push( @Apache::structuretags::whileconds, $code);
512: my $result = &Apache::run::run($code,$safeeval);
513: my $bodytext=$$parser[$#$parser]->get_text("/while");
514: push( @Apache::structuretags::whilebody, $bodytext);
515: if ( $result ) {
516: &Apache::lonxml::newparser($parser,\$bodytext);
517: }
518: return "";
519: }
520:
521: sub end_while {
522: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
523: my $code = pop @Apache::structuretags::whileconds;
524: my $bodytext = pop @Apache::structuretags::whilebody;
525: my $result = &Apache::run::run($code,$safeeval);
526: if ( $result ) {
527: &Apache::lonxml::newparser($parser,\$bodytext);
528: }
529: return "";
530: }
531:
532: # <randomlist show="1">
533: # <tag1>..</tag1>
534: # <tag2>..</tag2>
535: # <tag3>..</tag3>
536: # ...
537: # </randomlist>
538: sub start_randomlist {
539: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
540: my $result;
541: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
542: $target eq 'tex' || $target eq 'analyze') {
543: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
544: my $b_parser= HTML::TokeParser->new(\$body);
545: my $b_tok;
546: my @randomlist;
547: my $list_item;
548: while($b_tok = $b_parser->get_token() ) {
549: if($b_tok->[0] eq 'S') { # start tag
550: # get content of the tag until matching end tag
551: # get all text upto the matching tag
552: # and push the content into @randomlist
553: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
554: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
555: push(@randomlist,$list_item);
556: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
557: }
558: if($b_tok->[0] eq 'T') { # text
559: # what to do with text in between tags?
560: # print "<b>TEXT $b_tok->[1]</b><br />";
561: }
562: # if($b_tok->[0] eq 'E') { # end tag, should not happen
563: # print "<b>END-TAG $b_tok->[1]</b><br />";
564: # }
565: }
566: my @idx_arr = (0 .. $#randomlist);
567: &Apache::structuretags::shuffle(\@idx_arr);
568: my $bodytext = '';
569: my $show=$#randomlist;
570: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
571: $showarg--;
572: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
573: for(0 .. $show) {
574: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
575: }
576: &Apache::lonxml::newparser($parser,\$bodytext);
577: } elsif ($target eq 'edit' ) {
578: $result .= &Apache::edit::tag_start($target,$token);
579: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
580: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
581: } elsif ($target eq 'modified' ) {
582: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
583: 'show');
584: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
585: }
586: return $result;
587: }
588:
589: sub shuffle {
590: my $a=shift;
591: my $i;
592: if (defined(@$a)) {
593: &Apache::response::setrandomnumber();
594: for($i=@$a;--$i;) {
595: my $j=int(&Math::Random::random_uniform() * ($i+1));
596: next if $i == $j;
597: @$a[$i,$j] = @$a[$j,$i];
598: }
599: }
600: }
601:
602: sub end_randomlist {
603: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
604: my $result;
605: if ($target eq 'edit' ) {
606: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
607: }
608: return $result;
609: }
610:
611: sub start_part {
612: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
613: my $result='';
614: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
615: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
616: $Apache::inputtags::part=$id;
617: @Apache::inputtags::responselist = ();
618: @Apache::inputtags::previous=();
619: if ($target eq 'meta') {
620: return &Apache::response::mandatory_part_meta;
621: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
622: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
623: push (@Apache::inputtags::status,$status);
624: my $expression='$external::datestatus="'.$status.'";';
625: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
626: &Apache::run::run($expression,$safeeval);
627: if ( $status eq 'CLOSED' ) {
628: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
629: if ( $target eq "web" ) {
630: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
631: } elsif ( $target eq 'tex' ) {
632: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
633: }
634: } else {
635: if ($target eq 'tex') {
636: $result='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
637: }
638: }
639: }
640: return $result;
641: }
642:
643: sub end_part {
644: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
645: &Apache::lonxml::debug("in end_part $target ");
646: my $status=$Apache::inputtags::status['-1'];
647: pop @Apache::inputtags::status;
648: if ( $target eq 'meta' ) { return ''; }
649: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
650: return &Apache::inputtags::grade;
651: }
652: if ($target eq 'web' || $target eq 'tex' ) {
653: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
654: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
655: return $gradestatus;
656: }
657: return '';
658: }
659:
660: sub start_preduedate {
661: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
662: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
663: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
664: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
665: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
666: }
667: }
668: return '';
669: }
670:
671: sub end_preduedate {
672: return '';
673: }
674:
675: sub start_postanswerdate {
676: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
677: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
678: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
679: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
680: }
681: } elsif ($target eq 'tex') {
682: return '\vskip 0 mm \noindent';
683: }
684: return '';
685: }
686:
687: sub end_postanswerdate {
688: return '';
689: }
690:
691: sub start_notsolved {
692: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
693: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
694: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
695: &Apache::lonxml::debug("not solved has :$gradestatus:");
696: if ($gradestatus =~ /^correct/) {
697: &Apache::lonxml::debug("skipping");
698: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
699: }
700: }
701: return '';
702: }
703:
704: sub end_notsolved {
705: return '';
706: }
707:
708: sub start_solved {
709: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
710: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
711: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
712: if ($gradestatus !~ /^correct/) {
713: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
714: }
715: }
716: return '';
717: }
718:
719: sub end_solved {
720: return '';
721: }
722:
723: sub start_startouttext {
724: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
725: my @result=(''.'');
726: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
727: return (@result);
728: }
729: sub end_startouttext {
730: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
731: my $result='';
732: my $text='';
733:
734: if ($target eq 'edit') {
735: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
736: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
737: <td>Delete:".
738: &Apache::edit::deletelist($target,$token)
739: ."</td>
740: <td>".
741: &Apache::edit::insertlist($target,$token).
742: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
743: &Apache::edit::editfield($token->[1],$text,"",80,4);
744: }
745: if ($target eq 'modified') {
746: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
747: $result='<startouttext />'.&Apache::edit::modifiedfield();
748: }
749: if ($target eq 'tex') {
750: $result .= '\noindent ';
751: }
752: return $result;
753: }
754: sub start_endouttext {
755: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
756: my $result='';
757: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
758: if ($target eq "modified") { $result='<endouttext />'; }
759: return $result;
760: }
761: sub end_endouttext {
762: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
763: my @result=('','');
764: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
765: return (@result);
766: }
767: sub delete_startouttext {
768: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
769: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
770: my $text=$$parser['-1']->get_text("/endouttext");
771: my $ntoken=$$parser['-1']->get_token();
772: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
773: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
774: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
775: # they did the last time round
776: &Apache::lonxml::increasedepth($ntoken);
777: &Apache::lonxml::decreasedepth($ntoken);
778: return 1;
779: }
780:
781: 1;
782: __END__
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