1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.129 2002/10/28 14:47:22 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: 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: return $result;
173: }
174:
175: sub initialize_storage {
176: %Apache::lonhomework::results=();
177: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
178: if ($ENV{'request.state'} eq 'construct') {
179: %Apache::lonhomework::history=
180: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
181: my ($temp)=keys %Apache::lonhomework::history ;
182: &Apache::lonxml::debug("Return message of $temp");
183: } else {
184: %Apache::lonhomework::history=
185: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
186: }
187: #ignore error conditions
188: my ($temp)=keys %Apache::lonhomework::history ;
189: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
190: }
191:
192: # -------------------------------------------------------------finalize_storage
193: # Stores away the result has to a student's environment
194: # checks form.grade_ for specific values, other wises stores
195: # to the running users environment
196: sub finalize_storage {
197: my $result;
198: my ($temp) = keys %Apache::lonhomework::results;
199: if ( $temp ne '' ) {
200: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
201: if ($ENV{'request.state'} eq 'construct') {
202: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
203: $ENV{'request.uri'},'',$domain,$name);
204: &Apache::lonxml::debug('Construct Store return message:'.$result);
205: } else {
206: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
207: $symb,$courseid,$domain,$name);
208: &Apache::lonxml::debug('Store return message:'.$result);
209: }
210: }
211: return $result;
212: }
213:
214: sub checkout_msg {
215: return (<<ENDCHECKOUT);
216: <h2>The resource needs to be checked out</h2>
217: As a resource gets checked out, a unique timestamped ID is given to it, and a
218: permanent record is left in the system.<p />
219: <font color=red>
220: Checking out resources is subject to course policies, and may exclude future
221: credit even if done erroneously.<p />
222: </font>
223: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
224: <input type="hidden" name="doescheckout" value="yes" />
225: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
226: </form>
227: ENDCHECKOUT
228: }
229:
230: sub start_problem {
231: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
232:
233: # meta is called from lonpublisher, which doesn't uses the normal
234: # lonhomework method of parsing the file which means that inputtags
235: # won't get reset
236: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
237: &Apache::lonxml::error('Only one problem allowed in a .problem file');
238: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
239: return '';
240: }
241: #intialize globals
242: $Apache::inputtags::part='0';
243: @Apache::inputtags::responselist = ();
244: @Apache::inputtags::previous=();
245: if ($target ne 'analyze') {
246: &initialize_storage();
247: if ($target eq 'web') {
248: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
249: }
250: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
251: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
252: }
253: if ($Apache::lonhomework::type eq '') {
254: my $uri=$ENV{'request.uri'};
255: if ($uri=~/\.(\w+)$/) {
256: $Apache::lonhomework::type=$1;
257: &Apache::lonxml::debug("Using type of $1");
258: } else {
259: $Apache::lonhomework::type='problem';
260: &Apache::lonxml::debug("Using default type, problem, :$uri:");
261: }
262: }
263:
264: #added vars to the scripting enviroment
265: my $expression='$external::part='.$Apache::inputtags::part.';';
266: &Apache::run::run($expression,$safeeval);
267: my $status;
268: my $accessmsg;
269:
270: #should get back a <html> or the neccesary stuff to start XML/MathML
271: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
272: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
273: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
274:
275: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
276: #handle exam checkout
277: if ($Apache::lonhomework::type eq 'exam') {
278: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
279: if (($ENV{'form.doescheckout'}) && (!$token)) {
280: $token=&Apache::lonxml::maketoken();
281: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
282: }
283: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
284: }
285:
286: #handle rand seed in construction space
287: my $rndseed=&setup_rndseed($safeeval);
288: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
289: push (@Apache::inputtags::status,$status);
290: my $expression='$external::datestatus="'.$status.'";';
291: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
292: &Apache::run::run($expression,$safeeval);
293: if (( $status eq 'CLOSED' ) ||
294: ( $status eq 'UNCHECKEDOUT') ||
295: ( $status eq 'BANNED')) {
296: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
297: if ( $target eq "web" ) {
298: $result.= $head_tag_start.'</head>';
299: my $msg=$body_tag_start.
300: '<h1>Not open to be viewed</h1>';
301: if ($status eq 'CLOSED') {
302: $msg.='The problem '.$accessmsg;
303: } elsif ($status eq 'UNCHECKEDOUT') {
304: $msg.=&checkout_msg;
305: }
306: $result.=$msg.'<br />';
307: } elsif ($target eq 'tex') {
308: $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
309: }
310: } elsif ($target eq 'web') {
311: my $name= &get_resource_name($parstack,$safeeval);
312: if ($status eq 'CAN_ANSWER') {
313: # create a page header and exit
314: $result.="$head_tag_start<title>$name</title></head>
315: $body_tag_start \n $form_tag_start".
316: '<input type="hidden" name="submitted" value="yes" />';
317: if ($ENV{'request.state'} eq "construct") {
318: $result.= &problem_web_to_edit_header($rndseed);
319: }
320: # if we are viewing someone else preserve that info
321: if (defined $ENV{'form.grade_symb'}) {
322: foreach my $field ('symb','courseid','domain','username') {
323: $result .= '<input type="hidden" name="grade_'.$field.
324: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
325: }
326: }
327: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
328: || $status eq 'CLOSED') {
329: $result.=$head_tag_start.
330: "<title>$name</title></head>\n$body_tag_start\n";
331: }
332: } elsif ($target eq 'tex') {
333: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
334: if ($name eq '') {
335: $name=&Apache::lonnet::EXT('resource.title');
336: if ($name eq 'con_lost') { $name = ''; }
337: }
338: $Apache::lonhomework::name=$name;
339: my $id = $Apache::inputtags::part;
340: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
341: $duedate = POSIX::strftime("%c",localtime($duedate));
342: my $temp_file;
343: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
344: if (-e $filename) {
345: $temp_file = Apache::File->new($filename);
346: } else {
347: $temp_file = Apache::File->new('>>'.$filename);
348: }
349: my @due_file_content = <$temp_file>;
350: my $due_file_content = $due_file_content[$#due_file_content];
351: chomp $due_file_content;
352: if ($due_file_content ne $duedate) {
353: $temp_file = Apache::File->new('>'.$filename);
354: print $temp_file "$duedate\n";
355: if (not $ENV{'request.symb'} =~ m/\.page_/) {
356: if(not $duedate=~m/1969/) {
357: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
358: } else {
359: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
360: }
361: } else {
362: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
363: }
364: } else {
365: if (not $ENV{'request.symb'} =~ m/\.page_/) {
366: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
367: } else {
368: $result .= '\vskip 1mm \\\\\\\\';
369: }
370: }
371: }
372: } elsif ($target eq 'edit') {
373: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
374: &problem_edit_header();
375: my $temp=&Apache::edit::insertlist($target,$token);
376: $result.=$temp;
377: } elsif ($target eq 'modified') {
378: $result=$token->[4];
379: $result.=&Apache::edit::handle_insert();
380: } else {
381: # page_start returned a starting result, delete it if we don't need it
382: $result = '';
383: }
384: return $result;
385: }
386:
387: sub end_problem {
388: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
389: my $result='';
390: my $status=$Apache::inputtags::status['-1'];
391: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
392: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
393: # if part is zero, no <part>s existed, so we need to the grading
394: &Apache::inputtags::grade;
395: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
396: $status ne 'UNCHECKEDOUT') {
397: # if part is zero, no <part>s existed, so we need show the current
398: # grading status
399: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
400: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
401: }
402: if (
403: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
404: ($target eq 'answer') || ($target eq 'tex')
405: ) {
406: if ($status eq 'CAN_ANSWER') {
407: if ($target ne 'tex') {
408: $result.="</form></body>\n";
409: }
410: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
411: $status eq 'UNCHECKEDOUT' ) {
412: if ($target ne 'tex') {
413: $result.="</body>\n";
414: }
415: }
416: if ($target ne 'tex') {
417: $result.=&Apache::lonxml::xmlend();
418: } else {
419: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
420: if (not $ENV{'request.symb'} =~ m/\.page_/) {
421: $result .= '\end{minipage}\end{document} ';
422: } else {
423: $result .= '';
424: }
425: }
426: }
427: if ($target eq 'grade') {
428: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
429: &finalize_storage();
430: }
431: } elsif ($target eq 'meta') {
432: if ($Apache::inputtags::part eq '0') {
433: $result=&Apache::response::mandatory_part_meta;
434: }
435: } elsif ($target eq 'edit') {
436: &Apache::lonxml::debug("in end_problem with $target, edit");
437: $result = &problem_edit_footer();
438: }
439: return $result;
440: }
441:
442:
443: sub start_library {
444: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
445: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
446:
447: if ($target eq 'edit') {
448: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
449: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
450: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
451: &problem_edit_header();
452: my $temp=&Apache::edit::insertlist($target,$token);
453: $result.=$temp;
454: } elsif ($target eq 'modified') {
455: $result=$token->[4];
456: $result.=&Apache::edit::handle_insert();
457: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
458: $ENV{'request.state'} eq "construct" ) {
459: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
460: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
461: my $name=&get_resource_name($parstack,$safeeval);
462: my $rndseed=&setup_rndseed($safeeval);
463: $result.="$head_tag_start<title>$name</title></head>
464: $body_tag_start \n $form_tag_start".
465: '<input type="hidden" name="submitted" value="yes" />';
466: $result.=&problem_web_to_edit_header($rndseed);
467: }
468: return $result;
469: }
470:
471: sub end_library {
472: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
473: my $result='';
474: if ($target eq 'edit') {
475: $result=&problem_edit_footer();
476: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
477: $ENV{'request.state'} eq "construct") {
478: $result.='</form></body>'.&Apache::lonxml::xmlend();
479: }
480: return $result;
481: }
482:
483: sub start_block {
484: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
485:
486: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex' || $target eq 'analyze') {
487: my $code = @$parstack[$#$parstack];
488: $code =~ s/\"//g;
489: $code .=';return $condition;';
490: # print "<br />$code<br />";
491: my $result = &Apache::run::run($code,$safeeval);
492: &Apache::lonxml::debug("block :$code: returned :$result:");
493: if ( ! $result ) {
494: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
495: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
496: }
497: }
498: return "";
499: }
500:
501: sub end_block {
502: return '';
503: }
504:
505: sub start_while {
506: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
507:
508: my $code = @$parstack[$#$parstack];
509: $code =~ s/\"//g;
510: $code .=';return $condition;';
511:
512: push( @Apache::structuretags::whileconds, $code);
513: my $result = &Apache::run::run($code,$safeeval);
514: my $bodytext=$$parser[$#$parser]->get_text("/while");
515: push( @Apache::structuretags::whilebody, $bodytext);
516: if ( $result ) {
517: &Apache::lonxml::newparser($parser,\$bodytext);
518: }
519: return "";
520: }
521:
522: sub end_while {
523: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
524: my $code = pop @Apache::structuretags::whileconds;
525: my $bodytext = pop @Apache::structuretags::whilebody;
526: my $result = &Apache::run::run($code,$safeeval);
527: if ( $result ) {
528: &Apache::lonxml::newparser($parser,\$bodytext);
529: }
530: return "";
531: }
532:
533: # <randomlist show="1">
534: # <tag1>..</tag1>
535: # <tag2>..</tag2>
536: # <tag3>..</tag3>
537: # ...
538: # </randomlist>
539: sub start_randomlist {
540: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
541: my $result;
542: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
543: $target eq 'tex' || $target eq 'analyze') {
544: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
545: my $b_parser= HTML::TokeParser->new(\$body);
546: my $b_tok;
547: my @randomlist;
548: my $list_item;
549: while($b_tok = $b_parser->get_token() ) {
550: if($b_tok->[0] eq 'S') { # start tag
551: # get content of the tag until matching end tag
552: # get all text upto the matching tag
553: # and push the content into @randomlist
554: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
555: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
556: push(@randomlist,$list_item);
557: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
558: }
559: if($b_tok->[0] eq 'T') { # text
560: # what to do with text in between tags?
561: # print "<b>TEXT $b_tok->[1]</b><br />";
562: }
563: # if($b_tok->[0] eq 'E') { # end tag, should not happen
564: # print "<b>END-TAG $b_tok->[1]</b><br />";
565: # }
566: }
567: my @idx_arr = (0 .. $#randomlist);
568: &Apache::structuretags::shuffle(\@idx_arr);
569: my $bodytext = '';
570: my $show=$#randomlist;
571: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
572: $showarg--;
573: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
574: for(0 .. $show) {
575: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
576: }
577: &Apache::lonxml::newparser($parser,\$bodytext);
578: } elsif ($target eq 'edit' ) {
579: $result .= &Apache::edit::tag_start($target,$token);
580: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
581: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
582: } elsif ($target eq 'modified' ) {
583: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
584: 'show');
585: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
586: }
587: return $result;
588: }
589:
590: sub shuffle {
591: my $a=shift;
592: my $i;
593: if (defined(@$a)) {
594: &Apache::response::setrandomnumber();
595: for($i=@$a;--$i;) {
596: my $j=int(&Math::Random::random_uniform() * ($i+1));
597: next if $i == $j;
598: @$a[$i,$j] = @$a[$j,$i];
599: }
600: }
601: }
602:
603: sub end_randomlist {
604: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
605: my $result;
606: if ($target eq 'edit' ) {
607: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
608: }
609: return $result;
610: }
611:
612: sub start_part {
613: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
614: my $result='';
615: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
616: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
617: $Apache::inputtags::part=$id;
618: @Apache::inputtags::responselist = ();
619: @Apache::inputtags::previous=();
620: if ($target eq 'meta') {
621: return &Apache::response::mandatory_part_meta;
622: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
623: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
624: push (@Apache::inputtags::status,$status);
625: my $expression='$external::datestatus="'.$status.'";';
626: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
627: &Apache::run::run($expression,$safeeval);
628: if ( $status eq 'CLOSED' ) {
629: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
630: if ( $target eq "web" ) {
631: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
632: } elsif ( $target eq 'tex' ) {
633: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
634: }
635: } else {
636: if ($target eq 'tex') {
637: if ($$tagstack[-2] ne 'problem') {
638: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
639: }
640: }
641: }
642: }
643: return $result;
644: }
645:
646: sub end_part {
647: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
648: &Apache::lonxml::debug("in end_part $target ");
649: my $status=$Apache::inputtags::status['-1'];
650: pop @Apache::inputtags::status;
651: if ( $target eq 'meta' ) { return ''; }
652: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
653: return &Apache::inputtags::grade;
654: }
655: if ($target eq 'web' || $target eq 'tex' ) {
656: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
657: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
658: return $gradestatus;
659: }
660: return '';
661: }
662:
663: sub start_preduedate {
664: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
665: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
666: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
667: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
668: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
669: }
670: }
671: return '';
672: }
673:
674: sub end_preduedate {
675: return '';
676: }
677:
678: sub start_postanswerdate {
679: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
680: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
681: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
682: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
683: }
684: } elsif ($target eq 'tex') {
685: return '\vskip 0 mm \noindent';
686: }
687: return '';
688: }
689:
690: sub end_postanswerdate {
691: return '';
692: }
693:
694: sub start_notsolved {
695: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
696: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
697: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
698: &Apache::lonxml::debug("not solved has :$gradestatus:");
699: if ($gradestatus =~ /^correct/) {
700: &Apache::lonxml::debug("skipping");
701: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
702: }
703: }
704: return '';
705: }
706:
707: sub end_notsolved {
708: return '';
709: }
710:
711: sub start_solved {
712: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
713: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
714: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
715: if ($gradestatus !~ /^correct/) {
716: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
717: }
718: }
719: return '';
720: }
721:
722: sub end_solved {
723: return '';
724: }
725:
726: sub start_startouttext {
727: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
728: my @result=(''.'');
729: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
730: return (@result);
731: }
732: sub end_startouttext {
733: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
734: my $result='';
735: my $text='';
736:
737: if ($target eq 'edit') {
738: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
739: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
740: <td>Delete:".
741: &Apache::edit::deletelist($target,$token)
742: ."</td>
743: <td>".
744: &Apache::edit::insertlist($target,$token).
745: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
746: &Apache::edit::editfield($token->[1],$text,"",80,4);
747: }
748: if ($target eq 'modified') {
749: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
750: $result='<startouttext />'.&Apache::edit::modifiedfield();
751: }
752: if ($target eq 'tex') {
753: $result .= '\noindent ';
754: }
755: return $result;
756: }
757: sub start_endouttext {
758: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
759: my $result='';
760: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
761: if ($target eq "modified") { $result='<endouttext />'; }
762: return $result;
763: }
764: sub end_endouttext {
765: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
766: my @result=('','');
767: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
768: return (@result);
769: }
770: sub delete_startouttext {
771: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
772: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
773: my $text=$$parser['-1']->get_text("/endouttext");
774: my $ntoken=$$parser['-1']->get_token();
775: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
776: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
777: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
778: # they did the last time round
779: &Apache::lonxml::increasedepth($ntoken);
780: &Apache::lonxml::decreasedepth($ntoken);
781: return 1;
782: }
783:
784: 1;
785: __END__
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