1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: #
4: # $Id: structuretags.pm,v 1.86 2002/03/28 22:53:55 albertel Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28: # 2/19 Guy
29: # 6/26/2001 fixed extra web display at end of <web></web> tags
30: # 8/17,8/18,8/20 Gerd Kortemeyer
31:
32: package Apache::structuretags;
33:
34: use strict;
35: use Apache::lonnet;
36:
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 $result;
143: }
144:
145: sub checkout_msg {
146: return (<<ENDCHECKOUT);
147: <h2>The resource needs to be checked out</h2>
148: As a resource gets checked out, a unique timestamped ID is given to it, and a
149: permanent record is left in the system.<p />
150: <font color=red>
151: Checking out resources is subject to course policies, and may exclude future
152: credit even if done erroneously.<p />
153: </font>
154: <form method=post>
155: <input type=button name="doescheckout"
156: value="Check out Exam for Viewing"
157: onClick="if (confirm('Check out Exam?')) { this.form.submit(); }" />
158: </form>
159: ENDCHECKOUT
160: }
161:
162: sub start_problem {
163: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
164:
165: # meta is called from lonpublisher, which doesn't uses the normal
166: # lonhomework method of parsing the file which means that inputtags
167: # won't get reset
168: if ( $Apache::inputtags::part ne '' && $target != 'meta' ) {
169: &Apache::lonxml::error('Only one problem allowed in a .problem file');
170: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[-1]);
171: return '';
172: }
173: #intialize globals
174: $Apache::inputtags::part='0';
175: @Apache::inputtags::responselist = ();
176: @Apache::inputtags::previous=();
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: if ($Apache::lonhomework::type eq '') {
184: my $uri=$ENV{'request.uri'};
185: if ($uri=~/\.(\w+)$/) {
186: $Apache::lonhomework::type=$1;
187: &Apache::lonxml::debug("Using type of $1");
188: } else {
189: $Apache::lonhomework::type='problem';
190: &Apache::lonxml::debug("Using default type, problem, :$uri:");
191: }
192: }
193:
194: #added vars to the scripting enviroment
195: my $expression='$external::part='.$Apache::inputtags::part.';';
196: &Apache::run::run($expression,$safeeval);
197: my $status;
198: my $accessmsg;
199:
200: #should get back a <html> or the neccesary stuff to start XML/MathML
201: my ($result,$head_tag_start,$body_tag_start)=
202: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
203:
204:
205: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
206: #handle exam checkout
207: if ($Apache::lonhomework::type eq 'exam') {
208: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
209: if (($ENV{'form.doescheckout'}) && (!$token)) {
210: $token=&Apache::lonxml::maketoken();
211: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
212: }
213: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
214: }
215:
216: #handle rand seed in construction space
217: my $rndseed;
218: if ($ENV{'request.state'} eq "construct") {
219: $rndseed=$ENV{'form.rndseed'};
220: if (!$rndseed) {
221: $rndseed=time;
222: $ENV{'form.rndseed'}=$rndseed;
223: }
224: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
225: }
226: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
227: push (@Apache::inputtags::status,$status);
228: my $expression='$external::datestatus="'.$status.'";';
229: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
230: &Apache::run::run($expression,$safeeval);
231: if (( $status eq 'CLOSED' ) ||
232: ( $status eq 'UNCHECKEDOUT') ||
233: ( $status eq 'BANNED')) {
234: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
235: if ( $target eq "web" ) {
236: $result.= $head_tag_start.'</head>';
237: my $msg=$body_tag_start.
238: '<h1>Not open to be viewed</h1>';
239: if ($status eq 'CLOSED') {
240: $msg.='The problem '.$accessmsg;
241: } elsif ($status eq 'UNCHECKEDOUT') {
242: $msg.=&checkout_msg;
243: }
244: $result.=$msg.'<br />';
245: }
246: } elsif ($target eq 'web') {
247: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
248: if ($name eq '') {
249: $name=&Apache::lonnet::EXT('resource.title');
250: if ($name eq 'con_lost') { $name = ''; }
251: }
252: $Apache::lonhomework::name=$name;
253: if ($status eq 'CAN_ANSWER') {
254: # create a page header and exit
255: $result.="$head_tag_start<title>$name</title></head>\n
256: $body_tag_start\n
257: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
258: '<input type="hidden" name="submitted" value="yes" />';
259: if ($ENV{'request.state'} eq "construct") {
260: $result.=
261: '<input type="hidden" name="problemmode" value="View" />
262: <input type="submit" name="problemmode" value="Edit" />
263: <input type="submit" name="problemmode" value="EditXML" />
264: Random Seed:<input type="text" name="rndseed" width="10" value="'.
265: $rndseed.'" />
266: <input type="submit" name="changerandseed" value="Change" />
267: <input type="submit" name="resetdata" value="Reset Submissions" />
268: <hr />';
269: }
270: # if we are viewing someone else preserve that info
271: if (defined $ENV{'form.grade_symb'}) {
272: foreach my $field ('symb','courseid','domain','username') {
273: $result .= '<input type="hidden" name="grade_'.$field.
274: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
275: }
276: }
277: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
278: || $status eq 'CLOSED') {
279: $result.=$head_tag_start.
280: "<title>$name</title></head>\n$body_tag_start\n";
281: }
282: }
283: } elsif ($target eq 'edit') {
284: $result.=$head_tag_start."</head>".$body_tag_start.
285: '<form name="lonhomework" method="POST" action="'.
286: $ENV{'request.uri'}.'">
287: <input type="hidden" name="submitted" value="edit" />
288: <input type="hidden" name="problemmode" value="Edit" />
289: <input type="submit" name="problemmode" value="View" />
290: <input type="submit" name="problemmode" value="EditXML" />
291: <input type="submit" name="Undo" value="undo" /> <hr />
292: <input type="submit" name="submit" value="Submit Changes" /><br />
293: ';
294: my $temp=&Apache::edit::insertlist($target,$token);
295: $result.=$temp;
296: } elsif ($target eq 'modified') {
297: $result=$token->[4];
298: $result.=&Apache::edit::handle_insert();
299: } elsif ($target eq 'tex') {
300: $result .= '\begin{document} ';
301: } else {
302: # page_start returned a starting result, delete it if we don't need it
303: $result = '';
304: }
305: return $result;
306: }
307:
308: sub end_problem {
309: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
310: my $result='';
311: my $status=$Apache::inputtags::status['-1'];
312: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ) {
313: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
314: # if part is zero, no <part>s existed, so we need to the grading
315: &Apache::inputtags::grade;
316: } elsif ( $target eq 'web' && $Apache::inputtags::part eq '0') {
317: # if part is zero, no <part>s existed, so we need show the current
318: # grading status
319: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
320: }
321: if (
322: ($target eq 'web' && ($ENV{'request.state'} ne 'construct')) ||
323: ($target eq 'answer')
324: ) {
325: if ($status eq 'CAN_ANSWER') {
326: $result.="</form></body>\n";
327: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
328: $result.="</body>\n";
329: }
330: $result.=&Apache::lonxml::xmlend();
331: }
332: if ($target eq 'grade') {
333: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
334: &finalize_storage();
335: }
336: } elsif ($target eq 'meta') {
337: if ($Apache::inputtags::part eq '0') {
338: $result=&Apache::response::mandatory_part_meta;
339: }
340: } elsif ($target eq 'edit') {
341: &Apache::lonxml::debug("in end_problem with $target, edit");
342: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
343: } elsif ($target eq 'tex') {
344: $result .= '\noindent\makebox[9.0cm][b]{\hrulefill}\end{document}';
345: }
346: return $result;
347: }
348:
349: sub start_library {
350: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
351: my ($result,$head_tag_start,$body_tag_start)=
352: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
353: if ($target eq 'edit') {
354: $result.=$head_tag_start."</head>".$body_tag_start.
355: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
356: <input type="hidden" name="submitted" value="edit" />
357: <input type="hidden" name="problemmode" value="Edit" />
358: <input type="submit" name="problemmode" value="View" />
359: <input type="submit" name="Undo" value="undo" /> <hr />
360: ';
361: my $temp=&Apache::edit::insertlist($target,$token);
362: $result.=$temp;
363: return $result;
364: }
365: if ($target eq 'modified') {
366: $result=$token->[4];
367: $result.=&Apache::edit::handle_insert();
368: return $result;
369: }
370: return '';
371: }
372:
373: sub end_library {
374: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
375: my $result='';
376: if ($target eq 'edit') {
377: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
378: }
379: return $result;
380: }
381:
382: sub start_block {
383: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
384:
385: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
386: my $code = @$parstack[$#$parstack];
387: $code =~ s/\"//g;
388: $code .=';return $condition;';
389: # print "<br />$code<br />";
390: my $result = &Apache::run::run($code,$safeeval);
391: &Apache::lonxml::debug("block :$code: returned :$result:");
392: if ( ! $result ) {
393: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
394: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
395: }
396: }
397: return "";
398: }
399:
400: sub end_block {
401: return '';
402: }
403:
404: sub start_while {
405: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
406:
407: my $code = @$parstack[$#$parstack];
408: $code =~ s/\"//g;
409: $code .=';return $condition;';
410:
411: push( @Apache::structuretags::whileconds, $code);
412: my $result = &Apache::run::run($code,$safeeval);
413: my $bodytext=$$parser[$#$parser]->get_text("/while");
414: push( @Apache::structuretags::whilebody, $bodytext);
415: if ( $result ) {
416: &Apache::lonxml::newparser($parser,\$bodytext);
417: }
418: return "";
419: }
420:
421: sub end_while {
422: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
423: my $code = pop @Apache::structuretags::whileconds;
424: my $bodytext = pop @Apache::structuretags::whilebody;
425: my $result = &Apache::run::run($code,$safeeval);
426: if ( $result ) {
427: &Apache::lonxml::newparser($parser,\$bodytext);
428: }
429: return "";
430: }
431:
432: # <randomlist>
433: # <tag1>..</tag1>
434: # <tag2>..</tag2>
435: # <tag3>..</tag3>
436: # ...
437: # </randomlist>
438: sub start_randomlist {
439: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
440: my $result;
441: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web') {
442: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
443: my $b_parser= HTML::TokeParser->new(\$body);
444: my $b_tok;
445: my @randomlist;
446: my $list_item;
447: while($b_tok = $b_parser->get_token() ) {
448: if($b_tok->[0] eq 'S') { # start tag
449: # get content of the tag until matching end tag
450: # get all text upto the matching tag
451: # and push the content into @randomlist
452: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
453: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
454: push(@randomlist,$list_item);
455: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
456: }
457: if($b_tok->[0] eq 'T') { # text
458: # what to do with text in between tags?
459: # print "<b>TEXT $b_tok->[1]</b><br />";
460: }
461: # if($b_tok->[0] eq 'E') { # end tag, should not happen
462: # print "<b>END-TAG $b_tok->[1]</b><br />";
463: # }
464: }
465: my @idx_arr = (0 .. $#randomlist);
466: &Apache::structuretags::shuffle(\@idx_arr);
467: my $bodytext = '';
468: my $show=$#randomlist;
469: my $showarg=&Apache::lonxml::get_param('show',$parstack,$safeeval);
470: $showarg--;
471: if ( ($showarg >= 0) && ($showarg < $show) ) { $show = $showarg; }
472: for(0 .. $show) {
473: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
474: }
475: &Apache::lonxml::newparser($parser,\$bodytext);
476: } elsif ($target eq 'edit' ) {
477: $result .= &Apache::edit::tag_start($target,$token);
478: $result .= &Apache::edit::text_arg('Maximum Tags to Show:','show',$token,5);
479: $result .= &Apache::edit::end_row().&Apache::edit::start_spanning_row();
480: } elsif ($target eq 'modified' ) {
481: my $constructtag=&Apache::edit::get_new_args($token,$parstack,$safeeval,
482: 'show');
483: if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
484: }
485: return $result;
486: }
487:
488: sub shuffle {
489: my $a=shift;
490: my $i;
491: if (defined(@$a)) {
492: &Apache::response::setrandomnumber();
493: for($i=@$a;--$i;) {
494: my $j=int rand($i+1);
495: next if $i == $j;
496: @$a[$i,$j] = @$a[$j,$i];
497: }
498: }
499: }
500:
501: sub end_randomlist {
502: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
503: my $result;
504: if ($target eq 'edit' ) {
505: $result=&Apache::edit::tag_end($target,$token,'End Randomly Parsed Block');
506: }
507: return $result;
508: }
509:
510: sub start_part {
511: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
512: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
513: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
514: $Apache::inputtags::part=$id;
515: @Apache::inputtags::responselist = ();
516: @Apache::inputtags::previous=();
517: if ($target eq 'meta') {
518: return &Apache::response::mandatory_part_meta;
519: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
520: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
521: push (@Apache::inputtags::status,$status);
522: my $expression='$external::datestatus="'.$status.'";';
523: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
524: &Apache::run::run($expression,$safeeval);
525: if ( $status eq 'CLOSED' ) {
526: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
527: if ( $target eq "web" ) {
528: return "<br />Part is not open to be viewed. It $accessmsg<br />";
529: }
530: }
531: }
532: return '';
533: }
534:
535: sub end_part {
536: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
537: &Apache::lonxml::debug("in end_part $target ");
538: my $status=$Apache::inputtags::status['-1'];
539: pop @Apache::inputtags::status;
540: if ( $target eq 'meta' ) { return ''; }
541: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
542: return &Apache::inputtags::grade;
543: }
544: if ($target eq 'web') {
545: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
546: }
547: return '';
548: }
549:
550: sub start_preduedate {
551: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
552: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
553: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
554: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
555: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
556: }
557: }
558: return '';
559: }
560:
561: sub end_preduedate {
562: return '';
563: }
564:
565: sub start_postanswerdate {
566: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
567: if ($target eq 'web' || $target eq 'grade') {
568: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
569: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
570: }
571: }
572: return '';
573: }
574:
575: sub end_postanswerdate {
576: return '';
577: }
578:
579: sub start_notsolved {
580: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
581: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
582: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
583: &Apache::lonxml::debug("not solved has :$gradestatus:");
584: if ($gradestatus =~ /^correct/) {
585: &Apache::lonxml::debug("skipping");
586: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
587: }
588: }
589: return '';
590: }
591:
592: sub end_notsolved {
593: return '';
594: }
595:
596: sub start_solved {
597: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
598: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
599: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
600: if ($gradestatus !~ /^correct/) {
601: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
602: }
603: }
604: return '';
605: }
606:
607: sub end_solved {
608: return '';
609: }
610:
611: sub start_startouttext {
612: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
613: my @result=(''.'');
614: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
615: return (@result);
616: }
617: sub end_startouttext {
618: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
619: my $result='';
620: my $text='';
621:
622: if ($target eq 'edit') {
623: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
624: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
625: <td>Delete:".
626: &Apache::edit::deletelist($target,$token)
627: ."</td>
628: <td>".
629: &Apache::edit::insertlist($target,$token).
630: &Apache::edit::end_row().&Apache::edit::start_spanning_row()."\n".
631: &Apache::edit::editfield($token->[1],$text,"",50,4);
632: }
633: if ($target eq 'modified') {
634: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
635: $result='<startouttext />'.&Apache::edit::modifiedfield();
636: }
637: if ($target eq 'tex') {
638: $result .= '\noindent ';
639: }
640: return $result;
641: }
642: sub start_endouttext {
643: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
644: my $result='';
645: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
646: if ($target eq "modified") { $result='<endouttext />'; }
647: return $result;
648: }
649: sub end_endouttext {
650: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
651: my @result=('','');
652: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
653: return (@result);
654: }
655: sub delete_startouttext {
656: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
657: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
658: my $text=$$parser['-1']->get_text("/endouttext");
659: my $ntoken=$$parser['-1']->get_token();
660: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
661: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
662: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
663: # they did the last time round
664: &Apache::lonxml::increasedepth($ntoken);
665: &Apache::lonxml::decreasedepth($ntoken);
666: return 1;
667: }
668:
669: 1;
670: __END__
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