1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.106 2002/08/26 20:29:30 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: $result.= ' /> Show All Foils
165: <hr />';
166: }
167:
168: sub initialize_storage {
169: %Apache::lonhomework::results=();
170: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
171: if ($ENV{'request.state'} eq 'construct') {
172: %Apache::lonhomework::history=
173: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
174: my ($temp)=keys %Apache::lonhomework::history ;
175: &Apache::lonxml::debug("Return message of $temp");
176: } else {
177: %Apache::lonhomework::history=
178: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
179: }
180: #ignore error conditions
181: my ($temp)=keys %Apache::lonhomework::history ;
182: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
183: }
184:
185: # -------------------------------------------------------------finalize_storage
186: # Stores away the result has to a student's environment
187: # checks form.grade_ for specific values, other wises stores
188: # to the running users environment
189: sub finalize_storage {
190: my $result;
191: my ($temp) = keys %Apache::lonhomework::results;
192: if ( $temp ne '' ) {
193: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
194: if ($ENV{'request.state'} eq 'construct') {
195: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
196: $ENV{'request.uri'},'',$domain,$name);
197: &Apache::lonxml::debug('Construct Store return message:'.$result);
198: } else {
199: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
200: $symb,$courseid,$domain,$name);
201: &Apache::lonxml::debug('Store return message:'.$result);
202: }
203: }
204: return $result;
205: }
206:
207: sub checkout_msg {
208: return (<<ENDCHECKOUT);
209: <h2>The resource needs to be checked out</h2>
210: As a resource gets checked out, a unique timestamped ID is given to it, and a
211: permanent record is left in the system.<p />
212: <font color=red>
213: Checking out resources is subject to course policies, and may exclude future
214: credit even if done erroneously.<p />
215: </font>
216: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
217: <input type="hidden" name="doescheckout" value="yes" />
218: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
219: </form>
220: ENDCHECKOUT
221: }
222:
223: sub start_problem {
224: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
225:
226: # meta is called from lonpublisher, which doesn't uses the normal
227: # lonhomework method of parsing the file which means that inputtags
228: # won't get reset
229: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
230: &Apache::lonxml::error('Only one problem allowed in a .problem file');
231: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
232: return '';
233: }
234: #intialize globals
235: $Apache::inputtags::part='0';
236: @Apache::inputtags::responselist = ();
237: @Apache::inputtags::previous=();
238: if ($target ne 'analyze') {
239: &initialize_storage();
240: if ($target eq 'web') {
241: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
242: }
243: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
244: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
245: }
246: if ($Apache::lonhomework::type eq '') {
247: my $uri=$ENV{'request.uri'};
248: if ($uri=~/\.(\w+)$/) {
249: $Apache::lonhomework::type=$1;
250: &Apache::lonxml::debug("Using type of $1");
251: } else {
252: $Apache::lonhomework::type='problem';
253: &Apache::lonxml::debug("Using default type, problem, :$uri:");
254: }
255: }
256:
257: #added vars to the scripting enviroment
258: my $expression='$external::part='.$Apache::inputtags::part.';';
259: &Apache::run::run($expression,$safeeval);
260: my $status;
261: my $accessmsg;
262:
263: #should get back a <html> or the neccesary stuff to start XML/MathML
264: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
265: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
266: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
267:
268: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
269: #handle exam checkout
270: if ($Apache::lonhomework::type eq 'exam') {
271: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
272: if (($ENV{'form.doescheckout'}) && (!$token)) {
273: $token=&Apache::lonxml::maketoken();
274: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
275: }
276: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
277: }
278:
279: #handle rand seed in construction space
280: my $rndseed=&setup_rndseed($safeeval);
281: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
282: push (@Apache::inputtags::status,$status);
283: my $expression='$external::datestatus="'.$status.'";';
284: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
285: &Apache::run::run($expression,$safeeval);
286: if (( $status eq 'CLOSED' ) ||
287: ( $status eq 'UNCHECKEDOUT') ||
288: ( $status eq 'BANNED')) {
289: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
290: if ( $target eq "web" ) {
291: $result.= $head_tag_start.'</head>';
292: my $msg=$body_tag_start.
293: '<h1>Not open to be viewed</h1>';
294: if ($status eq 'CLOSED') {
295: $msg.='The problem '.$accessmsg;
296: } elsif ($status eq 'UNCHECKEDOUT') {
297: $msg.=&checkout_msg;
298: }
299: $result.=$msg.'<br />';
300: }
301: } elsif ($target eq 'web') {
302: my $name= &get_resource_name($parstack,$safeeval);
303: if ($status eq 'CAN_ANSWER') {
304: # create a page header and exit
305: $result.="$head_tag_start<title>$name</title></head>
306: $body_tag_start \n $form_tag_start".
307: '<input type="hidden" name="submitted" value="yes" />';
308: if ($ENV{'request.state'} eq "construct") {
309: $result.= &problem_web_to_edit_header($rndseed);
310: }
311: # if we are viewing someone else preserve that info
312: if (defined $ENV{'form.grade_symb'}) {
313: foreach my $field ('symb','courseid','domain','username') {
314: $result .= '<input type="hidden" name="grade_'.$field.
315: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
316: }
317: }
318: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
319: || $status eq 'CLOSED') {
320: $result.=$head_tag_start.
321: "<title>$name</title></head>\n$body_tag_start\n";
322: }
323: } elsif ($target eq 'tex') {
324: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
325: if ($name eq '') {
326: $name=&Apache::lonnet::EXT('resource.title');
327: if ($name eq 'con_lost') { $name = ''; }
328: }
329: $Apache::lonhomework::name=$name;
330: my $id = $Apache::inputtags::part;
331: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
332: $duedate = POSIX::strftime("%c",localtime($duedate));
333: my $temp_file;
334: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
335: if (-e $filename) {
336: $temp_file = Apache::File->new($filename);
337: } else {
338: $temp_file = Apache::File->new('>>'.$filename);
339: }
340: my @due_file_content = <$temp_file>;
341: my $due_file_content = $due_file_content[$#due_file_content];
342: chomp $due_file_content;
343: if ($due_file_content ne $duedate) {
344: $temp_file = Apache::File->new('>'.$filename);
345: print $temp_file "$duedate\n";
346: if (not $ENV{'request.symb'} =~ m/\.page_/) {
347: if(not $duedate=~m/1969/) {
348: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm';
349: } else {
350: $result .= '\begin{document} \noindent \vskip 1 mm';
351: }
352: } else {
353: $result .= '\parbox{\minipagewidth}{\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
354: }
355: } else {
356: if (not $ENV{'request.symb'} =~ m/\.page_/) {
357: $result .= '\begin{document} \noindent \vskip 1 mm';
358: } else {
359: $result .= '\parbox{\minipagewidth}{\vskip 1mm \\\\\\\\';
360: }
361: }
362: }
363: } elsif ($target eq 'edit') {
364: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
365: &problem_edit_header();
366: my $temp=&Apache::edit::insertlist($target,$token);
367: $result.=$temp;
368: } elsif ($target eq 'modified') {
369: $result=$token->[4];
370: $result.=&Apache::edit::handle_insert();
371: } else {
372: # page_start returned a starting result, delete it if we don't need it
373: $result = '';
374: }
375: return $result;
376: }
377:
378: sub end_problem {
379: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
380: my $result='';
381: my $status=$Apache::inputtags::status['-1'];
382: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
383: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
384: # if part is zero, no <part>s existed, so we need to the grading
385: &Apache::inputtags::grade;
386: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
387: $status ne 'UNCHECKEDOUT') {
388: # if part is zero, no <part>s existed, so we need show the current
389: # grading status
390: my $gradesatement = &Apache::inputtags::gradestatus($Apache::inputtags::part);
391: if ($target eq 'tex') {
392: $gradesatement =~ s/<table>//;
393: $gradesatement =~ s/<\/table>//;
394: $gradesatement =~ s/<tr([^>]*)>//g;
395: $gradesatement =~ s/<\/tr>//g;
396: $gradesatement =~ s/<td([^>]*)>//g;
397: $gradesatement =~ s/<\/td>//g;
398: $gradesatement =~ s/<b>/\\textbf{/g;
399: $gradesatement =~ s/<\/b>/}/g;
400: $gradesatement =~ s/<br \/>/\\vskip 0 mm /g;
401: $gradesatement =~ s/<input([^>]*)>//g;
402: }
403: $result.= $gradesatement;
404: if ($target eq 'tex') {
405: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
406: if (not $ENV{'request.symb'} =~ m/\.page_/) {
407: $result .= '\end{document} ';
408: } else {
409: $result .= '} ';
410: }
411: }
412: }
413: if (
414: (($target eq 'web' || $target eq 'tex') && ($ENV{'request.state'} ne 'construct')) ||
415: ($target eq 'answer')
416: ) {
417: if ($status eq 'CAN_ANSWER') {
418: if ($target ne 'tex') {
419: $result.="</form></body>\n";
420: }
421: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
422: $status eq 'UNCHECKEDOUT' ) {
423: if ($target ne 'tex') {
424: $result.="</body>\n";
425: }
426: }
427: if ($target ne 'tex') {
428: $result.=&Apache::lonxml::xmlend();
429: } else {
430: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
431: if (not $ENV{'request.symb'} =~ m/\.page_/) {
432: $result .= '\end{document} ';
433: } else {
434: $result .= '} ';
435: }
436: }
437: }
438: if ($target eq 'grade') {
439: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
440: &finalize_storage();
441: }
442: } elsif ($target eq 'meta') {
443: if ($Apache::inputtags::part eq '0') {
444: $result=&Apache::response::mandatory_part_meta;
445: }
446: } elsif ($target eq 'edit') {
447: &Apache::lonxml::debug("in end_problem with $target, edit");
448: $result = &problem_edit_footer();
449: }
450: return $result;
451: }
452:
453: sub start_library {
454: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
455: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
456: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
457: if ($target eq 'edit') {
458: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
459: &problem_edit_header();
460: my $temp=&Apache::edit::insertlist($target,$token);
461: $result.=$temp;
462: } elsif ($target eq 'modified') {
463: $result=$token->[4];
464: $result.=&Apache::edit::handle_insert();
465: } elsif ($target eq 'web' && $ENV{'request.state'} eq "construct" ) {
466: my $name=&get_resource_name($parstack,$safeeval);
467: my $rndseed=&setup_rndseed($safeeval);
468: $result.="$head_tag_start<title>$name</title></head>
469: $body_tag_start \n $form_tag_start".
470: '<input type="hidden" name="submitted" value="yes" />';
471: $result.=&problem_web_to_edit_header($rndseed);
472: }
473: return $result;
474: }
475:
476: sub end_library {
477: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
478: my $result='';
479: if ($target eq 'edit') {
480: $result=&problem_edit_footer();
481: } elsif ($target eq 'web' && $ENV{'request.state'} eq "construct") {
482: $result.='</form></body>'.&Apache::lonxml::xmlend();
483: }
484: return $result;
485: }
486:
487: sub start_block {
488: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
489:
490: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
491: my $code = @$parstack[$#$parstack];
492: $code =~ s/\"//g;
493: $code .=';return $condition;';
494: # print "<br />$code<br />";
495: my $result = &Apache::run::run($code,$safeeval);
496: &Apache::lonxml::debug("block :$code: returned :$result:");
497: if ( ! $result ) {
498: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
499: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
500: }
501: }
502: return "";
503: }
504:
505: sub end_block {
506: return '';
507: }
508:
509: sub start_while {
510: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
511:
512: my $code = @$parstack[$#$parstack];
513: $code =~ s/\"//g;
514: $code .=';return $condition;';
515:
516: push( @Apache::structuretags::whileconds, $code);
517: my $result = &Apache::run::run($code,$safeeval);
518: my $bodytext=$$parser[$#$parser]->get_text("/while");
519: push( @Apache::structuretags::whilebody, $bodytext);
520: if ( $result ) {
521: &Apache::lonxml::newparser($parser,\$bodytext);
522: }
523: return "";
524: }
525:
526: sub end_while {
527: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
528: my $code = pop @Apache::structuretags::whileconds;
529: my $bodytext = pop @Apache::structuretags::whilebody;
530: my $result = &Apache::run::run($code,$safeeval);
531: if ( $result ) {
532: &Apache::lonxml::newparser($parser,\$bodytext);
533: }
534: return "";
535: }
536:
537: # <randomlist>
538: # <tag1>..</tag1>
539: # <tag2>..</tag2>
540: # <tag3>..</tag3>
541: # ...
542: # </randomlist>
543: sub start_randomlist {
544: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
545: my $result;
546: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web') {
547: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
548: my $b_parser= HTML::TokeParser->new(\$body);
549: my $b_tok;
550: my @randomlist;
551: my $list_item;
552: while($b_tok = $b_parser->get_token() ) {
553: if($b_tok->[0] eq 'S') { # start tag
554: # get content of the tag until matching end tag
555: # get all text upto the matching tag
556: # and push the content into @randomlist
557: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
558: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
559: push(@randomlist,$list_item);
560: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
561: }
562: if($b_tok->[0] eq 'T') { # text
563: # what to do with text in between tags?
564: # print "<b>TEXT $b_tok->[1]</b><br />";
565: }
566: # if($b_tok->[0] eq 'E') { # end tag, should not happen
567: # print "<b>END-TAG $b_tok->[1]</b><br />";
568: # }
569: }
570: my @idx_arr = (0 .. $#randomlist);
571: &Apache::structuretags::shuffle(\@idx_arr);
572: my $bodytext = '';
573: my $show=$#randomlist;
574: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
575: $showarg--;
576: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
577: for(0 .. $show) {
578: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
579: }
580: &Apache::lonxml::newparser($parser,\$bodytext);
581: } elsif ($target eq 'edit' ) {
582: $result .= &Apache::edit::tag_start($target,$token);
583: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
584: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
585: } elsif ($target eq 'modified' ) {
586: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
587: 'show');
588: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
589: }
590: return $result;
591: }
592:
593: sub shuffle {
594: my $a=shift;
595: my $i;
596: if (defined(@$a)) {
597: &Apache::response::setrandomnumber();
598: for($i=@$a;--$i;) {
599: my $j=int rand($i+1);
600: next if $i == $j;
601: @$a[$i,$j] = @$a[$j,$i];
602: }
603: }
604: }
605:
606: sub end_randomlist {
607: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
608: my $result;
609: if ($target eq 'edit' ) {
610: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
611: }
612: return $result;
613: }
614:
615: sub start_part {
616: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
617: my $result='';
618: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
619: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
620: $Apache::inputtags::part=$id;
621: @Apache::inputtags::responselist = ();
622: @Apache::inputtags::previous=();
623: if ($target eq 'meta') {
624: return &Apache::response::mandatory_part_meta;
625: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
626: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
627: push (@Apache::inputtags::status,$status);
628: my $expression='$external::datestatus="'.$status.'";';
629: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
630: &Apache::run::run($expression,$safeeval);
631: if ( $status eq 'CLOSED' ) {
632: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
633: if ( $target eq "web" ) {
634: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
635: } elsif ( $target eq 'tex' ) {
636: $result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";
637: }
638: } else {
639: if ($target eq 'tex') {
640: $result='\vskip 0 mm';
641: }
642: }
643: }
644: return $result;
645: }
646:
647: sub end_part {
648: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
649: &Apache::lonxml::debug("in end_part $target ");
650: my $status=$Apache::inputtags::status['-1'];
651: pop @Apache::inputtags::status;
652: if ( $target eq 'meta' ) { return ''; }
653: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
654: return &Apache::inputtags::grade;
655: }
656: if ($target eq 'web') {
657: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
658: }
659: return '';
660: }
661:
662: sub start_preduedate {
663: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
664: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
665: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
666: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
667: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
668: }
669: }
670: return '';
671: }
672:
673: sub end_preduedate {
674: return '';
675: }
676:
677: sub start_postanswerdate {
678: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
679: if ($target eq 'web' || $target eq 'grade') {
680: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
681: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
682: }
683: } elsif ($target eq 'tex') {
684: return '\vskip 0 mm \noindent';
685: }
686: return '';
687: }
688:
689: sub end_postanswerdate {
690: return '';
691: }
692:
693: sub start_notsolved {
694: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
695: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
696: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
697: &Apache::lonxml::debug("not solved has :$gradestatus:");
698: if ($gradestatus =~ /^correct/) {
699: &Apache::lonxml::debug("skipping");
700: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
701: }
702: }
703: return '';
704: }
705:
706: sub end_notsolved {
707: return '';
708: }
709:
710: sub start_solved {
711: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
712: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
713: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
714: if ($gradestatus !~ /^correct/) {
715: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
716: }
717: }
718: return '';
719: }
720:
721: sub end_solved {
722: return '';
723: }
724:
725: sub start_startouttext {
726: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
727: my @result=(''.'');
728: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
729: return (@result);
730: }
731: sub end_startouttext {
732: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
733: my $result='';
734: my $text='';
735:
736: if ($target eq 'edit') {
737: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
738: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
739: <td>Delete:".
740: &Apache::edit::deletelist($target,$token)
741: ."</td>
742: <td>".
743: &Apache::edit::insertlist($target,$token).
744: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
745: &Apache::edit::editfield($token->[1],$text,"",50,4);
746: }
747: if ($target eq 'modified') {
748: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
749: $result='<startouttext />'.&Apache::edit::modifiedfield();
750: }
751: if ($target eq 'tex') {
752: $result .= '\noindent ';
753: }
754: return $result;
755: }
756: sub start_endouttext {
757: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
758: my $result='';
759: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
760: if ($target eq "modified") { $result='<endouttext />'; }
761: return $result;
762: }
763: sub end_endouttext {
764: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
765: my @result=('','');
766: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
767: return (@result);
768: }
769: sub delete_startouttext {
770: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
771: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
772: my $text=$$parser['-1']->get_text("/endouttext");
773: my $ntoken=$$parser['-1']->get_token();
774: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
775: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
776: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
777: # they did the last time round
778: &Apache::lonxml::increasedepth($ntoken);
779: &Apache::lonxml::decreasedepth($ntoken);
780: return 1;
781: }
782:
783: 1;
784: __END__
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