1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.145 2003/02/07 21:50:12 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # 2/19 Guy
29: # 6/26/2001 fixed extra web display at end of <web></web> tags
30: # 8/17,8/18,8/20 Gerd Kortemeyer
31:
32:
33: package Apache::structuretags;
34:
35: use strict;
36: use Apache::lonnet;
37: use Apache::File();
38:
39: BEGIN {
40: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
41: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
42: }
43:
44: sub start_web {
45: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
46: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
47: if ($target eq 'web') {
48: return $bodytext;
49: }
50: return '';
51: }
52:
53: sub end_web {
54: return '';
55: }
56:
57: sub start_tex {
58: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
59: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
60: if ($target eq 'tex') {
61: return $bodytext.' ';
62: }
63: return '';
64: }
65:
66: sub end_tex {
67: return '';
68: }
69:
70: sub page_start {
71: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
72: my %found;
73: foreach my $taginside ($tagstack) {
74: foreach my $taglookedfor ('html','body','form') {
75: if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
76: }
77: }
78:
79: my $result;
80: my $head_tag_start;
81: if (!defined($found{'html'})) {
82: $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
83: $parser,$safeeval);
84: $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);
85: }
86: my $body_tag_start;
87: if (!defined($found{'body'})) {
88: $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
89: 'onUnload="'.&Apache::lonxml::unloadevents().'" ';
90: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
91: if ($background) {
92: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
93: $background;
94: $body_tag_start.='background="'.$background.'" ';
95: } else {
96: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
97: if ($bgcolor) {
98: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
99: } else {
100: $body_tag_start.='bgcolor="#ffffff"';
101: }
102: }
103: $body_tag_start.='>';
104: if ($target eq 'web' && $ENV{'request.state'} ne 'construct') {
105: my ($symb)=&Apache::lonxml::whichuser();
106: if ($symb eq '') {
107: my $help = &Apache::loncommon::help_open_topic("Ambiguous_Reference");
108: $help="Browsing or <a href=\"/adm/ambiguous\">ambiguous</a> reference, submissions ignored $help<br />";
109: $body_tag_start.=$help;
110: }
111: }
112: }
113: my $form_tag_start;
114: if (!defined($found{'form'})) {
115: $form_tag_start='<form name="lonhomework" method="POST" action="'.
116: $ENV{'request.uri'}.'">';
117: }
118: return ($result,$head_tag_start,$body_tag_start,$form_tag_start);
119: }
120:
121: #use Time::HiRes();
122: sub get_resource_name {
123: my ($parstack,$safeeval)=@_;
124: my $name=&Apache::lonnet::gettitle();
125: if ($name eq '') {
126: $name=&Apache::lonnet::EXT('resource.title');
127: if ($name eq 'con_lost') { $name = ''; }
128: }
129: $Apache::lonhomework::name=$name;
130: return $name;
131: }
132:
133: sub setup_rndseed {
134: my ($safeeval)=@_;
135: my $rndseed;
136: if ($ENV{'request.state'} eq "construct") {
137: $rndseed=$ENV{'form.rndseed'};
138: if (!$rndseed) {
139: $rndseed=time;
140: $ENV{'form.rndseed'}=$rndseed;
141: }
142: &Apache::lonxml::debug("Setting rndseed to $rndseed");
143: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
144: }
145: return $rndseed;
146: }
147:
148: sub problem_edit_header {
149: return '<input type="hidden" name="submitted" value="edit" />
150: <input type="hidden" name="problemmode" value="Edit" />
151: <input type="submit" name="problemmode" value="Discard Edits and View" />
152: <input type="submit" name="problemmode" value="EditXML" />
153: <input type="submit" name="Undo" value="undo" /> <hr />
154: <input type="submit" name="submit" value="Submit Changes and Edit" />
155: <input type="submit" name="submit" value="Submit Changes and View" /><br /><p> </p><table border="0"><tr><td bgcolor="#DDDDDD">
156: ';
157: }
158:
159: sub problem_edit_footer {
160: return '</td></tr></table><br /><input type="submit" name="submit" value="Submit Changes and Edit" />
161: <input type="submit" name="submit" value="Submit Changes and View" />';
162: }
163:
164: sub problem_web_to_edit_header {
165: my ($rndseed)=@_;
166: my $result.='<input type="hidden" name="problemmode" value="View" />
167: <input type="submit" name="problemmode" value="Edit" />
168: <input type="submit" name="problemmode" value="EditXML" />
169: Random Seed:<input type="text" name="rndseed" width="10" value="'.
170: $rndseed.'" />
171: <input type="submit" name="changerandseed" value="Change" />
172: <input type="submit" name="resetdata" value="Reset Submissions" />
173: <input type="checkbox" name="showallfoils" ';
174: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
175: $result.= ' /> Show All Foils
176: <hr />';
177: my $numtoanalyze=$ENV{'form.numtoanalyze'};
178: if (!$numtoanalyze) { $numtoanalyze=100; }
179: $result.= '<input type="submit" name="problemmode" value="Answer Distribution" />
180: <input type="text" name="numtoanalyze" value="'.
181: $numtoanalyze.'" size="5" /> <hr />';
182: return $result;
183: }
184:
185: sub initialize_storage {
186: %Apache::lonhomework::results=();
187: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
188: if ($ENV{'request.state'} eq 'construct') {
189: %Apache::lonhomework::history=
190: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
191: my ($temp)=keys %Apache::lonhomework::history ;
192: &Apache::lonxml::debug("Return message of $temp");
193: } else {
194: %Apache::lonhomework::history=
195: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
196: }
197: #ignore error conditions
198: my ($temp)=keys %Apache::lonhomework::history ;
199: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
200: }
201:
202: # -------------------------------------------------------------finalize_storage
203: # Stores away the result has to a student's environment
204: # checks form.grade_ for specific values, other wises stores
205: # to the running users environment
206: sub finalize_storage {
207: my $result;
208: my ($temp) = keys %Apache::lonhomework::results;
209: if ( $temp ne '' ) {
210: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
211: if ($ENV{'request.state'} eq 'construct') {
212: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
213: $ENV{'request.uri'},'',$domain,$name);
214: &Apache::lonxml::debug('Construct Store return message:'.$result);
215: } else {
216: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
217: $symb,$courseid,$domain,$name);
218: &Apache::lonxml::debug('Store return message:'.$result);
219: }
220: }
221: return $result;
222: }
223:
224: sub checkout_msg {
225: return (<<ENDCHECKOUT);
226: <h2>The resource needs to be checked out</h2>
227: As a resource gets checked out, a unique timestamped ID is given to it, and a
228: permanent record is left in the system.<p />
229: <font color=red>
230: Checking out resources is subject to course policies, and may exclude future
231: credit even if done erroneously.<p />
232: </font>
233: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
234: <input type="hidden" name="doescheckout" value="yes" />
235: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
236: </form>
237: ENDCHECKOUT
238: }
239:
240: sub start_problem {
241: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
242:
243: # meta is called from lonpublisher, which doesn't uses the normal
244: # lonhomework method of parsing the file which means that inputtags
245: # won't get reset
246: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
247: &Apache::lonxml::error('Only one problem allowed in a .problem file');
248: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
249: return '';
250: }
251: #intialize globals
252: $Apache::inputtags::part='0';
253: @Apache::inputtags::responselist = ();
254: @Apache::inputtags::previous=();
255: if ($target ne 'analyze') {
256: &initialize_storage();
257: if ($target eq 'web') {
258: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
259: }
260: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
261: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
262: }
263: if ($Apache::lonhomework::type eq '') {
264: my $uri=$ENV{'request.uri'};
265: if ($uri=~/\.(\w+)$/) {
266: $Apache::lonhomework::type=$1;
267: &Apache::lonxml::debug("Using type of $1");
268: } else {
269: $Apache::lonhomework::type='problem';
270: &Apache::lonxml::debug("Using default type, problem, :$uri:");
271: }
272: }
273:
274: #added vars to the scripting enviroment
275: my $expression='$external::part='.$Apache::inputtags::part.';';
276: &Apache::run::run($expression,$safeeval);
277: my $status;
278: my $accessmsg;
279:
280: #should get back a <html> or the neccesary stuff to start XML/MathML
281: my ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
282: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
283: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
284:
285: if ($target eq 'analyze') { my $rndseed=&setup_rndseed($safeeval); }
286: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
287: #handle exam checkout
288: if ($Apache::lonhomework::type eq 'exam') {
289: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
290: if (($ENV{'form.doescheckout'}) && (!$token)) {
291: $token=&Apache::lonxml::maketoken();
292: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
293: }
294: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
295: }
296:
297: #handle rand seed in construction space
298: my $rndseed=&setup_rndseed($safeeval);
299: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
300: push (@Apache::inputtags::status,$status);
301: my $expression='$external::datestatus="'.$status.'";';
302: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
303: &Apache::run::run($expression,$safeeval);
304: &Apache::lonxml::debug("Got $status");
305: if (( $status eq 'CLOSED' ) ||
306: ( $status eq 'UNCHECKEDOUT') ||
307: ( $status eq 'BANNED') ||
308: ( $status eq 'UNAVAILABLE')) {
309: my $bodytext=&Apache::lonxml::get_all_text("/problem",$parser);
310: if ( $target eq "web" ) {
311: $result.= $head_tag_start.'</head>';
312: my $msg=$body_tag_start;
313: if ($status eq 'UNAVAILABLE') {
314: $result.='<h1>Unable to determine if this resource is open due to network problems. Please try again later.</h1>';
315: } else {
316: $result.='<h1>Not open to be viewed</h1>';
317: }
318: if ($status eq 'CLOSED') {
319: $msg.='The problem '.$accessmsg;
320: } elsif ($status eq 'UNCHECKEDOUT') {
321: $msg.=&checkout_msg;
322: }
323: $result.=$msg.'<br />';
324: } elsif ($target eq 'tex') {
325: $result.="\\begin{document}\\noindent \\vskip 1 mm \\begin{minipage}{\\textwidth}\\vskip 0 mm ";
326: if ($status eq 'UNAVAILABLE') {
327: $result.='Unable to determine if this resource is open due to network problems. Please try again later.\vskip 0 mm ';
328: } else {
329: $result.="Problem is not open to be viewed. It $accessmsg \\vskip 0 mm ";
330: }
331: }
332: } elsif ($target eq 'web') {
333: my $name= &get_resource_name($parstack,$safeeval);
334: if ($status eq 'CAN_ANSWER') {
335: # create a page header and exit
336: $result.="$head_tag_start<title>$name</title></head>
337: $body_tag_start \n $form_tag_start".
338: '<input type="hidden" name="submitted" value="yes" />';
339: if ($ENV{'request.state'} eq "construct") {
340: $result.= &problem_web_to_edit_header($rndseed);
341: }
342: # if we are viewing someone else preserve that info
343: if (defined $ENV{'form.grade_symb'}) {
344: foreach my $field ('symb','courseid','domain','username') {
345: $result .= '<input type="hidden" name="grade_'.$field.
346: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
347: }
348: }
349: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
350: || $status eq 'CLOSED' || $status eq 'UNAVALAILABLE') {
351: $result.=$head_tag_start.
352: "<title>$name</title></head>\n$body_tag_start\n";
353: }
354: } elsif ($target eq 'tex') {
355: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
356: if ($name eq '') {
357: $name=&Apache::lonnet::EXT('resource.title');
358: if ($name eq 'con_lost') { $name = ''; }
359: }
360: $Apache::lonhomework::name=$name;
361: my $id = $Apache::inputtags::part;
362: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
363: $duedate = POSIX::strftime("%c",localtime($duedate));
364: my $temp_file;
365: my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.due";
366: if (-e $filename) {
367: $temp_file = Apache::File->new($filename);
368: } else {
369: $temp_file = Apache::File->new('>>'.$filename);
370: }
371: my @due_file_content = <$temp_file>;
372: my $due_file_content = $due_file_content[$#due_file_content];
373: chomp $due_file_content;
374: if ($due_file_content ne $duedate) {
375: $temp_file = Apache::File->new('>'.$filename);
376: print $temp_file "$duedate\n";
377: if (not $ENV{'request.symb'} =~ m/\.page_/) {
378: if(not $duedate=~m/1969/) {
379: $result .= '\begin{document} \noindent\textit{Due date: '.$duedate.'} \vskip 1 mm\noindent \begin{minipage}{\textwidth}';
380: } else {
381: $result .= '\begin{document} \noindent \vskip 1 mm \noindent\begin{minipage}{\textwidth}';
382: }
383: } else {
384: $result .= '\vskip 1mm\textit{Due date: '.$duedate.'} \\\\\\\\';
385: }
386: } else {
387: if (not $ENV{'request.symb'} =~ m/\.page_/) {
388: $result .= '\begin{document} \noindent \vskip 1 mm\noindent\begin{minipage}{\textwidth}';
389: } else {
390: $result .= '\vskip 1mm \\\\\\\\';
391: }
392: }
393: }
394: } elsif ($target eq 'edit') {
395: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
396: &problem_edit_header();
397: my $temp=&Apache::edit::insertlist($target,$token);
398: $result.=$temp;
399: } elsif ($target eq 'modified') {
400: $result=$token->[4];
401: $result.=&Apache::edit::handle_insert();
402: } else {
403: # page_start returned a starting result, delete it if we don't need it
404: $result = '';
405: }
406: return $result;
407: }
408:
409: sub end_problem {
410: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
411: my $result='';
412: my $status=$Apache::inputtags::status['-1'];
413: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' || $target eq 'tex') {
414: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' && $status eq 'CAN_ANSWER' ) {
415: # if part is zero, no <part>s existed, so we need to the grading
416: &Apache::inputtags::grade;
417: } elsif ( ($target eq 'web' || $target eq 'tex') && $Apache::inputtags::part eq '0' &&
418: $status ne 'UNCHECKEDOUT') {
419: # if part is zero, no <part>s existed, so we need show the current
420: # grading status
421: my $gradestatus = &Apache::inputtags::gradestatus($Apache::inputtags::part,$target);
422: if ($Apache::lonhomework::type ne 'exam') {$result.= $gradestatus;}
423: }
424: if (
425: (($target eq 'web') && ($ENV{'request.state'} ne 'construct')) ||
426: ($target eq 'answer') || ($target eq 'tex')
427: ) {
428: if ($status eq 'CAN_ANSWER') {
429: if ($target ne 'tex') {
430: $result.="</form></body>\n";
431: }
432: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
433: $status eq 'UNCHECKEDOUT' ) {
434: if ($target ne 'tex') {
435: $result.="</body>\n";
436: }
437: }
438: if ($target eq 'web') {
439: $result.=&Apache::lonxml::xmlend();
440: } elsif ($target eq 'tex') {
441: $result .= '\vskip 0.5mm\noindent\makebox[\textwidth/$number_of_columns][b]{\hrulefill}';
442: if (not $ENV{'request.symb'} =~ m/\.page_/) {
443: $result .= '\end{minipage}\end{document} ';
444: } else {
445: $result .= '';
446: }
447: }
448: }
449: if ($target eq 'grade') {
450: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
451: &finalize_storage();
452: }
453: if ($target eq 'answer' && ($ENV{'request.state'} eq 'construct') ) {
454: $result.='</html>'; #normally we get it from xmlend, but in CSTR
455: # we always show answer mode too.
456: }
457: } elsif ($target eq 'meta') {
458: if ($Apache::inputtags::part eq '0') {
459: $result=&Apache::response::mandatory_part_meta;
460: }
461: } elsif ($target eq 'edit') {
462: &Apache::lonxml::debug("in end_problem with $target, edit");
463: $result = &problem_edit_footer();
464: }
465: return $result;
466: }
467:
468:
469: sub start_library {
470: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
471: my ($result,$head_tag_start,$body_tag_start,$form_tag_start);
472:
473: if ($target eq 'edit') {
474: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
475: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
476: $result.=$head_tag_start."</head>".$body_tag_start.$form_tag_start.
477: &problem_edit_header();
478: my $temp=&Apache::edit::insertlist($target,$token);
479: $result.=$temp;
480: } elsif ($target eq 'modified') {
481: $result=$token->[4];
482: $result.=&Apache::edit::handle_insert();
483: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
484: $ENV{'request.state'} eq "construct" ) {
485: ($result,$head_tag_start,$body_tag_start,$form_tag_start)=
486: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
487: my $name=&get_resource_name($parstack,$safeeval);
488: my $rndseed=&setup_rndseed($safeeval);
489: $result.="$head_tag_start<title>$name</title></head>
490: $body_tag_start \n $form_tag_start".
491: '<input type="hidden" name="submitted" value="yes" />';
492: $result.=&problem_web_to_edit_header($rndseed);
493: }
494: return $result;
495: }
496:
497: sub end_library {
498: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
499: my $result='';
500: if ($target eq 'edit') {
501: $result=&problem_edit_footer();
502: } elsif ($target eq 'web' && $$tagstack[0] ne 'problem' &&
503: $ENV{'request.state'} eq "construct") {
504: $result.='</form></body>'.&Apache::lonxml::xmlend();
505: }
506: return $result;
507: }
508:
509: sub start_block {
510: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
511:
512: my $result;
513:
514: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' ||
515: $target eq 'tex' || $target eq 'analyze') {
516: my $code = @$parstack[$#$parstack];
517: if ($code) {
518: $code =~ s/\"//g;
519: $code .=';return $condition;';
520: if (!$Apache::lonxml::default_homework_loaded) {
521: &Apache::lonxml::default_homework_load($safeeval);
522: }
523: $result = &Apache::run::run($code,$safeeval);
524: &Apache::lonxml::debug("block :$code: returned :$result:");
525: } else {
526: $result='1';
527: }
528: if ( ! $result ) {
529: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[-1]);
530: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[-1]");
531: }
532: $result='';
533: } elsif ($target eq 'edit') {
534: $result .=&Apache::edit::tag_start($target,$token);
535: $result .=&Apache::edit::text_arg('Test Condition:','condition',
536: $token,40);
537: $result .=&Apache::edit::end_row().&Apache::edit::start_spanning_row();
538: } elsif ($target eq 'modified') {
539: my $constructtag=&Apache::edit::get_new_args($token,$parstack,
540: $safeeval,'condition');
541: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
542: }
543: return $result;
544: }
545:
546: sub end_block {
547: return '';
548: }
549:
550: sub start_while {
551: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
552:
553: my $code = @$parstack[$#$parstack];
554: $code =~ s/\"//g;
555: $code .=';return $condition;';
556:
557: push( @Apache::structuretags::whileconds, $code);
558: if (!$Apache::lonxml::default_homework_loaded) {
559: &Apache::lonxml::default_homework_load($safeeval);
560: }
561: my $result = &Apache::run::run($code,$safeeval);
562: my $bodytext=$$parser[$#$parser]->get_text("/while");
563: push( @Apache::structuretags::whilebody, $bodytext);
564: if ( $result ) {
565: &Apache::lonxml::newparser($parser,\$bodytext);
566: }
567: return "";
568: }
569:
570: sub end_while {
571: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
572: my $code = pop @Apache::structuretags::whileconds;
573: my $bodytext = pop @Apache::structuretags::whilebody;
574: my $result = &Apache::run::run($code,$safeeval);
575: if ( $result ) {
576: &Apache::lonxml::newparser($parser,\$bodytext);
577: }
578: return "";
579: }
580:
581: # <randomlist show="1">
582: # <tag1>..</tag1>
583: # <tag2>..</tag2>
584: # <tag3>..</tag3>
585: # ...
586: # </randomlist>
587: sub start_randomlist {
588: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
589: my $result;
590: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web' ||
591: $target eq 'tex' || $target eq 'analyze') {
592: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
593: my $b_parser= HTML::TokeParser->new(\$body);
594: my $b_tok;
595: my @randomlist;
596: my $list_item;
597: while($b_tok = $b_parser->get_token() ) {
598: if($b_tok->[0] eq 'S') { # start tag
599: # get content of the tag until matching end tag
600: # get all text upto the matching tag
601: # and push the content into @randomlist
602: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
603: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
604: push(@randomlist,$list_item);
605: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
606: }
607: if($b_tok->[0] eq 'T') { # text
608: # what to do with text in between tags?
609: # print "<b>TEXT $b_tok->[1]</b><br />";
610: }
611: # if($b_tok->[0] eq 'E') { # end tag, should not happen
612: # print "<b>END-TAG $b_tok->[1]</b><br />";
613: # }
614: }
615: my @idx_arr = (0 .. $#randomlist);
616: &Apache::structuretags::shuffle(\@idx_arr);
617: my $bodytext = '';
618: my $show=$#randomlist;
619: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
620: $showarg--;
621: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
622: for(0 .. $show) {
623: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
624: }
625: &Apache::lonxml::newparser($parser,\$bodytext);
626: } elsif ($target eq 'edit' ) {
627: $result .= &Apache::edit::tag_start($target,$token);
628: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
629: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
630: } elsif ($target eq 'modified' ) {
631: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
632: 'show');
633: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
634: }
635: return $result;
636: }
637:
638: sub shuffle {
639: my $a=shift;
640: my $i;
641: if (defined(@$a)) {
642: &Apache::response::setrandomnumber();
643: for($i=@$a;--$i;) {
644: my $j=int(&Math::Random::random_uniform() * ($i+1));
645: next if $i == $j;
646: @$a[$i,$j] = @$a[$j,$i];
647: }
648: }
649: }
650:
651: sub end_randomlist {
652: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
653: my $result;
654: if ($target eq 'edit' ) {
655: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
656: }
657: return $result;
658: }
659:
660: sub start_part {
661: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
662: my $result='';
663: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
664: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
665: $Apache::inputtags::part=$id;
666: @Apache::inputtags::responselist = ();
667: @Apache::inputtags::previous=();
668: if ($target eq 'meta') {
669: return &Apache::response::mandatory_part_meta;
670: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
671: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
672: push (@Apache::inputtags::status,$status);
673: my $expression='$external::datestatus="'.$status.'";';
674: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
675: &Apache::run::run($expression,$safeeval);
676: if ( $status eq 'CLOSED' ) {
677: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
678: if ( $target eq "web" ) {
679: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
680: } elsif ( $target eq 'tex' ) {
681: $result="\\end{minipage}\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\\\begin{minipage}{\\textwidth}";
682: }
683: } else {
684: if ($target eq 'tex') {
685: if ($$tagstack[-2] ne 'problem') {
686: $result.='\noindent \end{minipage}\vskip 0 mm \noindent \begin{minipage}{\textwidth}\noindent';
687: }
688: }
689: }
690: } elsif ($target eq 'edit') {
691: $result.=&Apache::edit::tag_start($target,$token);
692: $result.=&Apache::edit::text_arg('Part ID:','id',$token).
693: &Apache::loncommon::help_open_topic("Part_Tag_Edit_Help").
694: &Apache::edit::end_row().&Apache::edit::start_spanning_row();
695:
696: } elsif ($target eq 'modified') {
697: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
698: 'id');
699: if ($constructtag) {
700: $result = &Apache::edit::rebuild_tag($token);
701: $result.=&Apache::edit::handle_insert();
702: }
703: }
704: return $result;
705: }
706:
707: sub end_part {
708: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
709: &Apache::lonxml::debug("in end_part $target ");
710: my $status=$Apache::inputtags::status['-1'];
711: my $result='';
712: if ( $target eq 'meta' ) {
713: $result='';
714: } elsif ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
715: $result=&Apache::inputtags::grade;
716: } elsif ($target eq 'web' || $target eq 'tex' ) {
717: my $gradestatus=&Apache::inputtags::gradestatus($Apache::inputtags::part,
718: $target);
719: if ($Apache::lonhomework::type eq 'exam') {$gradestatus='';}
720: $result=$gradestatus;
721: }
722: pop @Apache::inputtags::status;
723: return $result;
724: }
725:
726: sub start_preduedate {
727: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
728: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
729: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
730: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' &&
731: $Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
732: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
733: }
734: }
735: return '';
736: }
737:
738: sub end_preduedate {
739: return '';
740: }
741:
742: sub start_postanswerdate {
743: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
744: if ($target eq 'web' || $target eq 'grade' || $target eq 'tex') {
745: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
746: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
747: }
748: } elsif ($target eq 'tex') {
749: return '\vskip 0 mm \noindent';
750: }
751: return '';
752: }
753:
754: sub end_postanswerdate {
755: return '';
756: }
757:
758: sub start_notsolved {
759: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
760: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
761: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
762: &Apache::lonxml::debug("not solved has :$gradestatus:");
763: if ($gradestatus =~ /^correct/) {
764: &Apache::lonxml::debug("skipping");
765: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
766: }
767: }
768: return '';
769: }
770:
771: sub end_notsolved {
772: return '';
773: }
774:
775: sub start_solved {
776: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
777: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
778: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
779: if ($gradestatus !~ /^correct/) {
780: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
781: }
782: }
783: return '';
784: }
785:
786: sub end_solved {
787: return '';
788: }
789:
790: sub start_startouttext {
791: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
792: my @result=(''.'');
793: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
794: return (@result);
795: }
796: sub end_startouttext {
797: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
798: my $result='';
799: my $text='';
800:
801: if ($target eq 'edit') {
802: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
803: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
804: <td>Delete:".
805: &Apache::edit::deletelist($target,$token)
806: ."</td>
807: <td>".
808: &Apache::edit::insertlist($target,$token).
809: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
810: &Apache::edit::editfield($token->[1],$text,"",80,4);
811: }
812: if ($target eq 'modified') {
813: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
814: $result='<startouttext />'.&Apache::edit::modifiedfield();
815: }
816: if ($target eq 'tex') {
817: $result .= '\noindent ';
818: }
819: return $result;
820: }
821: sub start_endouttext {
822: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
823: my $result='';
824: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
825: if ($target eq "modified") {
826: $result='<endouttext />'.
827: &Apache::edit::handle_insertafter('startouttext'); }
828: return $result;
829: }
830: sub end_endouttext {
831: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
832: my @result=('','');
833: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
834: return (@result);
835: }
836: sub delete_startouttext {
837: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
838: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
839: my $text=$$parser['-1']->get_text("/endouttext");
840: my $ntoken=$$parser['-1']->get_token();
841: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
842: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
843: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
844: # they did the last time round
845: &Apache::lonxml::increasedepth($ntoken);
846: &Apache::lonxml::decreasedepth($ntoken);
847: return 1;
848: }
849:
850: 1;
851: __END__
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