1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.98 2002/06/25 14:50:53 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:
37: BEGIN {
38: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
39: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
40: }
41:
42: sub start_web {
43: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
44: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
45: if ($target eq 'web') {
46: return $bodytext;
47: }
48: return '';
49: }
50:
51: sub end_web {
52: return '';
53: }
54:
55: sub start_tex {
56: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
57: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
58: if ($target eq 'tex') {
59: return $bodytext
60: }
61: return '';
62: }
63:
64: sub end_tex {
65: return '';
66: }
67:
68: sub page_start {
69: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
70: my %found;
71: foreach my $taginside ($tagstack) {
72: foreach my $taglookedfor ('html','body','form') {
73: if ($taginside =~ /^$taglookedfor$/i) { $found{$taglookedfor} = 1; }
74: }
75: }
76:
77: my $result;
78: my $head_tag_start;
79: if (!defined($found{'html'})) {
80: $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,
81: $parser,$safeeval);
82: $head_tag_start='<head>'.&Apache::lonxml::registerurl(undef,$target);
83: }
84: my $body_tag_start;
85: if (!defined($found{'body'})) {
86: $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
87: 'onUnload="'.&Apache::lonxml::unloadevents().'" ';
88: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
89: if ($background) {
90: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
91: $background;
92: $body_tag_start.='background="'.$background.'" ';
93: } else {
94: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
95: if ($bgcolor) {
96: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
97: } else {
98: $body_tag_start.='bgcolor="#ffffff"';
99: }
100: }
101: $body_tag_start.='>';
102: }
103: return ($result,$head_tag_start,$body_tag_start);
104: }
105:
106: sub initialize_storage {
107: %Apache::lonhomework::results=();
108: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
109: if ($ENV{'request.state'} eq 'construct') {
110: %Apache::lonhomework::history=
111: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
112: my ($temp)=keys %Apache::lonhomework::history ;
113: &Apache::lonxml::debug("Return message of $temp");
114: } else {
115: %Apache::lonhomework::history=
116: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
117: }
118: #ignore error conditions
119: my ($temp)=keys %Apache::lonhomework::history ;
120: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
121: }
122:
123: # -------------------------------------------------------------finalize_storage
124: # Stores away the result has to a student's environment
125: # checks form.grade_ for specific values, other wises stores
126: # to the running users environment
127: sub finalize_storage {
128: my $result;
129: my ($temp) = keys %Apache::lonhomework::results;
130: if ( $temp ne '' ) {
131: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
132: if ($ENV{'request.state'} eq 'construct') {
133: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
134: $ENV{'request.uri'},'',$domain,$name);
135: &Apache::lonxml::debug('Construct Store return message:'.$result);
136: } else {
137: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
138: $symb,$courseid,$domain,$name);
139: &Apache::lonxml::debug('Store return message:'.$result);
140: }
141: }
142: return $result;
143: }
144:
145: sub checkout_msg {
146: return (<<ENDCHECKOUT);
147: <h2>The resource needs to be checked out</h2>
148: As a resource gets checked out, a unique timestamped ID is given to it, and a
149: permanent record is left in the system.<p />
150: <font color=red>
151: Checking out resources is subject to course policies, and may exclude future
152: credit even if done erroneously.<p />
153: </font>
154: <form name="checkout" method="POST" action="$ENV{'request.uri'}">
155: <input type="hidden" name="doescheckout" value="yes" />
156: <input type="button" name="checkoutbutton" value="Check out Exam for Viewing" onClick="javascript:if (confirm('Check out Exam?')) { document.checkout.submit(); }" />
157: </form>
158: ENDCHECKOUT
159: }
160:
161: sub start_problem {
162: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
163:
164: # meta is called from lonpublisher, which doesn't uses the normal
165: # lonhomework method of parsing the file which means that inputtags
166: # won't get reset
167: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
168: &Apache::lonxml::error('Only one problem allowed in a .problem file');
169: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
170: return '';
171: }
172: #intialize globals
173: $Apache::inputtags::part='0';
174: @Apache::inputtags::responselist = ();
175: @Apache::inputtags::previous=();
176: if ($target ne 'analyze') {
177: &initialize_storage();
178: if ($target eq 'web') {
179: &Apache::lonhomework::showhash(%Apache::lonhomework::history);
180: }
181: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
182: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
183: }
184: if ($Apache::lonhomework::type eq '') {
185: my $uri=$ENV{'request.uri'};
186: if ($uri=~/\.(\w+)$/) {
187: $Apache::lonhomework::type=$1;
188: &Apache::lonxml::debug("Using type of $1");
189: } else {
190: $Apache::lonhomework::type='problem';
191: &Apache::lonxml::debug("Using default type, problem, :$uri:");
192: }
193: }
194:
195: #added vars to the scripting enviroment
196: my $expression='$external::part='.$Apache::inputtags::part.';';
197: &Apache::run::run($expression,$safeeval);
198: my $status;
199: my $accessmsg;
200:
201: #should get back a <html> or the neccesary stuff to start XML/MathML
202: my ($result,$head_tag_start,$body_tag_start)=
203: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
204: if ($target eq 'tex' and $ENV{'request.symb'} =~ m/\.page_/) { $result = '';}
205:
206: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
207: #handle exam checkout
208: if ($Apache::lonhomework::type eq 'exam') {
209: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
210: if (($ENV{'form.doescheckout'}) && (!$token)) {
211: $token=&Apache::lonxml::maketoken();
212: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
213: }
214: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
215: }
216:
217: #handle rand seed in construction space
218: my $rndseed;
219: if ($ENV{'request.state'} eq "construct") {
220: $rndseed=$ENV{'form.rndseed'};
221: if (!$rndseed) {
222: $rndseed=time;
223: $ENV{'form.rndseed'}=$rndseed;
224: }
225: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
226: }
227: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
228: push (@Apache::inputtags::status,$status);
229: my $expression='$external::datestatus="'.$status.'";';
230: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
231: &Apache::run::run($expression,$safeeval);
232: if (( $status eq 'CLOSED' ) ||
233: ( $status eq 'UNCHECKEDOUT') ||
234: ( $status eq 'BANNED')) {
235: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
236: if ( $target eq "web" ) {
237: $result.= $head_tag_start.'</head>';
238: my $msg=$body_tag_start.
239: '<h1>Not open to be viewed</h1>';
240: if ($status eq 'CLOSED') {
241: $msg.='The problem '.$accessmsg;
242: } elsif ($status eq 'UNCHECKEDOUT') {
243: $msg.=&checkout_msg;
244: }
245: $result.=$msg.'<br />';
246: }
247: } elsif ($target eq 'web') {
248: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
249: if ($name eq '') {
250: $name=&Apache::lonnet::EXT('resource.title');
251: if ($name eq 'con_lost') { $name = ''; }
252: }
253: $Apache::lonhomework::name=$name;
254: if ($status eq 'CAN_ANSWER') {
255: # create a page header and exit
256: $result.="$head_tag_start<title>$name</title></head>\n
257: $body_tag_start\n
258: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
259: '<input type="hidden" name="submitted" value="yes" />';
260: if ($ENV{'request.state'} eq "construct") {
261: $result.=
262: '<input type="hidden" name="problemmode" value="View" />
263: <input type="submit" name="problemmode" value="Edit" />
264: <input type="submit" name="problemmode" value="EditXML" />
265: Random Seed:<input type="text" name="rndseed" width="10" value="'.
266: $rndseed.'" />
267: <input type="submit" name="changerandseed" value="Change" />
268: <input type="submit" name="resetdata" value="Reset Submissions" />
269: <input type="checkbox" name="showallfoils" ';
270: if (defined($ENV{'form.showallfoils'})) { $result.='checked="on"'; }
271: $result.= ' /> Show All Foils
272: <hr />';
273: }
274: # if we are viewing someone else preserve that info
275: if (defined $ENV{'form.grade_symb'}) {
276: foreach my $field ('symb','courseid','domain','username') {
277: $result .= '<input type="hidden" name="grade_'.$field.
278: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
279: }
280: }
281: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
282: || $status eq 'CLOSED') {
283: $result.=$head_tag_start.
284: "<title>$name</title></head>\n$body_tag_start\n";
285: }
286: } elsif ($target eq 'tex') {
287: my $id = $Apache::inputtags::part;
288: my $duedate = &Apache::lonnet::EXT("resource.$id.duedate");
289: $duedate = POSIX::strftime("%c",localtime($duedate));
290: if (not $ENV{'request.symb'} =~ m/\.page_/) {
291: $result .= '\begin{document} \noindent\fbox{Due date: '.$duedate.'} \\vskip 1 mm';
292: } else {
293: $result .= '\begin{minipage}{\minipagewidth} ';
294: }
295: }
296: } elsif ($target eq 'edit') {
297: $result.=$head_tag_start."</head>".$body_tag_start.
298: '<form name="lonhomework" method="POST" action="'.
299: $ENV{'request.uri'}.'">
300: <input type="hidden" name="submitted" value="edit" />
301: <input type="hidden" name="problemmode" value="Edit" />
302: <input type="submit" name="problemmode" value="Discard Edits and View" />
303: <input type="submit" name="problemmode" value="EditXML" />
304: <input type="submit" name="Undo" value="undo" /> <hr />
305: <input type="submit" name="submit" value="Submit Changes" />
306: <input type="submit" name="submit" value="Submit Changes and View" /><br />
307: ';
308: my $temp=&Apache::edit::insertlist($target,$token);
309: $result.=$temp;
310: } elsif ($target eq 'modified') {
311: $result=$token->[4];
312: $result.=&Apache::edit::handle_insert();
313: } else {
314: # page_start returned a starting result, delete it if we don't need it
315: $result = '';
316: }
317: return $result;
318: }
319:
320: sub end_problem {
321: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
322: my $result='';
323: my $status=$Apache::inputtags::status['-1'];
324: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ) {
325: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
326: # if part is zero, no <part>s existed, so we need to the grading
327: &Apache::inputtags::grade;
328: } elsif ( $target eq 'web' && $Apache::inputtags::part eq '0' &&
329: $status ne 'UNCHECKEDOUT') {
330: # if part is zero, no <part>s existed, so we need show the current
331: # grading status
332: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
333: }
334: if (
335: ($target eq 'web' && ($ENV{'request.state'} ne 'construct')) ||
336: ($target eq 'answer')
337: ) {
338: if ($status eq 'CAN_ANSWER') {
339: $result.="</form></body>\n";
340: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' ||
341: $status eq 'UNCHECKEDOUT' ) {
342: $result.="</body>\n";
343: }
344: $result.=&Apache::lonxml::xmlend();
345: }
346: if ($target eq 'grade') {
347: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
348: &finalize_storage();
349: }
350: } elsif ($target eq 'meta') {
351: if ($Apache::inputtags::part eq '0') {
352: $result=&Apache::response::mandatory_part_meta;
353: }
354: } elsif ($target eq 'edit') {
355: &Apache::lonxml::debug("in end_problem with $target, edit");
356: $result ='<br /><input type="submit" name="submit" value="Submit Changes and Edit" />';
357: $result.='<input type="submit" name="submit" value="Submit Changes and View" />';
358: } elsif ($target eq 'tex') {
359: $result .= '\vskip 0.5mm\noindent\makebox[9.0cm][b]{\hrulefill}';
360: if (not $ENV{'request.symb'} =~ m/\.page_/) {
361: $result .= '\end{document} ';
362: } else {
363: $result .= '\end{minipage} ';
364: }
365: }
366: return $result;
367: }
368:
369: sub start_library {
370: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
371: my ($result,$head_tag_start,$body_tag_start)=
372: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
373: if ($target eq 'edit') {
374: $result.=$head_tag_start."</head>".$body_tag_start.
375: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
376: <input type="hidden" name="submitted" value="edit" />
377: <input type="hidden" name="problemmode" value="Edit" />
378: <input type="submit" name="problemmode" value="View" />
379: <input type="submit" name="Undo" value="undo" /> <hr />
380: ';
381: my $temp=&Apache::edit::insertlist($target,$token);
382: $result.=$temp;
383: return $result;
384: }
385: if ($target eq 'modified') {
386: $result=$token->[4];
387: $result.=&Apache::edit::handle_insert();
388: return $result;
389: }
390: return '';
391: }
392:
393: sub end_library {
394: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
395: my $result='';
396: if ($target eq 'edit') {
397: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
398: }
399: return $result;
400: }
401:
402: sub start_block {
403: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
404:
405: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
406: my $code = @$parstack[$#$parstack];
407: $code =~ s/\"//g;
408: $code .=';return $condition;';
409: # print "<br />$code<br />";
410: my $result = &Apache::run::run($code,$safeeval);
411: &Apache::lonxml::debug("block :$code: returned :$result:");
412: if ( ! $result ) {
413: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
414: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
415: }
416: }
417: return "";
418: }
419:
420: sub end_block {
421: return '';
422: }
423:
424: sub start_while {
425: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
426:
427: my $code = @$parstack[$#$parstack];
428: $code =~ s/\"//g;
429: $code .=';return $condition;';
430:
431: push( @Apache::structuretags::whileconds, $code);
432: my $result = &Apache::run::run($code,$safeeval);
433: my $bodytext=$$parser[$#$parser]->get_text("/while");
434: push( @Apache::structuretags::whilebody, $bodytext);
435: if ( $result ) {
436: &Apache::lonxml::newparser($parser,\$bodytext);
437: }
438: return "";
439: }
440:
441: sub end_while {
442: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
443: my $code = pop @Apache::structuretags::whileconds;
444: my $bodytext = pop @Apache::structuretags::whilebody;
445: my $result = &Apache::run::run($code,$safeeval);
446: if ( $result ) {
447: &Apache::lonxml::newparser($parser,\$bodytext);
448: }
449: return "";
450: }
451:
452: # <randomlist>
453: # <tag1>..</tag1>
454: # <tag2>..</tag2>
455: # <tag3>..</tag3>
456: # ...
457: # </randomlist>
458: sub start_randomlist {
459: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
460: my $result;
461: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web') {
462: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
463: my $b_parser= HTML::TokeParser->new(\$body);
464: my $b_tok;
465: my @randomlist;
466: my $list_item;
467: while($b_tok = $b_parser->get_token() ) {
468: if($b_tok->[0] eq 'S') { # start tag
469: # get content of the tag until matching end tag
470: # get all text upto the matching tag
471: # and push the content into @randomlist
472: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
473: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
474: push(@randomlist,$list_item);
475: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
476: }
477: if($b_tok->[0] eq 'T') { # text
478: # what to do with text in between tags?
479: # print "<b>TEXT $b_tok->[1]</b><br />";
480: }
481: # if($b_tok->[0] eq 'E') { # end tag, should not happen
482: # print "<b>END-TAG $b_tok->[1]</b><br />";
483: # }
484: }
485: my @idx_arr = (0 .. $#randomlist);
486: &Apache::structuretags::shuffle(\@idx_arr);
487: my $bodytext = '';
488: my $show=$#randomlist;
489: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
490: $showarg--;
491: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
492: for(0 .. $show) {
493: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
494: }
495: &Apache::lonxml::newparser($parser,\$bodytext);
496: } elsif ($target eq 'edit' ) {
497: $result .= &Apache::edit::tag_start($target,$token);
498: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
499: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
500: } elsif ($target eq 'modified' ) {
501: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
502: 'show');
503: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
504: }
505: return $result;
506: }
507:
508: sub shuffle {
509: my $a=shift;
510: my $i;
511: if (defined(@$a)) {
512: &Apache::response::setrandomnumber();
513: for($i=@$a;--$i;) {
514: my $j=int rand($i+1);
515: next if $i == $j;
516: @$a[$i,$j] = @$a[$j,$i];
517: }
518: }
519: }
520:
521: sub end_randomlist {
522: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
523: my $result;
524: if ($target eq 'edit' ) {
525: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
526: }
527: return $result;
528: }
529:
530: sub start_part {
531: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
532: my $result='';
533: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
534: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
535: $Apache::inputtags::part=$id;
536: @Apache::inputtags::responselist = ();
537: @Apache::inputtags::previous=();
538: if ($target eq 'meta') {
539: return &Apache::response::mandatory_part_meta;
540: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer' || $target eq 'tex') {
541: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
542: push (@Apache::inputtags::status,$status);
543: my $expression='$external::datestatus="'.$status.'";';
544: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
545: &Apache::run::run($expression,$safeeval);
546: if ( $status eq 'CLOSED' ) {
547: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
548: if ( $target eq "web" ) {
549: $result="<br />Part is not open to be viewed. It $accessmsg<br />";
550: } elsif ( $target eq 'tex' ) {
551: $result="\\vskip 0 mm Part is not open to be viewed. It $accessmsg \\\\";
552: }
553: } else {
554: if ($target eq 'tex') {
555: $result='\vskip 0 mm';
556: }
557: }
558: }
559: return $result;
560: }
561:
562: sub end_part {
563: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
564: &Apache::lonxml::debug("in end_part $target ");
565: my $status=$Apache::inputtags::status['-1'];
566: pop @Apache::inputtags::status;
567: if ( $target eq 'meta' ) { return ''; }
568: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
569: return &Apache::inputtags::grade;
570: }
571: if ($target eq 'web') {
572: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
573: }
574: return '';
575: }
576:
577: sub start_preduedate {
578: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
579: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
580: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
581: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
582: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
583: }
584: }
585: return '';
586: }
587:
588: sub end_preduedate {
589: return '';
590: }
591:
592: sub start_postanswerdate {
593: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
594: if ($target eq 'web' || $target eq 'grade') {
595: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
596: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
597: }
598: }
599: return '';
600: }
601:
602: sub end_postanswerdate {
603: return '';
604: }
605:
606: sub start_notsolved {
607: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
608: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
609: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
610: &Apache::lonxml::debug("not solved has :$gradestatus:");
611: if ($gradestatus =~ /^correct/) {
612: &Apache::lonxml::debug("skipping");
613: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
614: }
615: }
616: return '';
617: }
618:
619: sub end_notsolved {
620: return '';
621: }
622:
623: sub start_solved {
624: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
625: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
626: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
627: if ($gradestatus !~ /^correct/) {
628: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
629: }
630: }
631: return '';
632: }
633:
634: sub end_solved {
635: return '';
636: }
637:
638: sub start_startouttext {
639: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
640: my @result=(''.'');
641: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
642: return (@result);
643: }
644: sub end_startouttext {
645: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
646: my $result='';
647: my $text='';
648:
649: if ($target eq 'edit') {
650: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
651: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
652: <td>Delete:".
653: &Apache::edit::deletelist($target,$token)
654: ."</td>
655: <td>".
656: &Apache::edit::insertlist($target,$token).
657: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
658: &Apache::edit::editfield($token->[1],$text,"",50,4);
659: }
660: if ($target eq 'modified') {
661: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
662: $result='<startouttext />'.&Apache::edit::modifiedfield();
663: }
664: if ($target eq 'tex') {
665: $result .= '\noindent ';
666: }
667: return $result;
668: }
669: sub start_endouttext {
670: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
671: my $result='';
672: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
673: if ($target eq "modified") { $result='<endouttext />'; }
674: return $result;
675: }
676: sub end_endouttext {
677: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
678: my @result=('','');
679: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
680: return (@result);
681: }
682: sub delete_startouttext {
683: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
684: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
685: my $text=$$parser['-1']->get_text("/endouttext");
686: my $ntoken=$$parser['-1']->get_token();
687: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
688: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
689: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
690: # they did the last time round
691: &Apache::lonxml::increasedepth($ntoken);
692: &Apache::lonxml::decreasedepth($ntoken);
693: return 1;
694: }
695:
696: 1;
697: __END__
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