1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: # 2/19 Guy
4: # 6/26/2001 fixed extra web display at end of <web></web> tags
5: # 8/17,8/18,8/20 Gerd Kortemeyer
6:
7: package Apache::structuretags;
8:
9: use strict;
10: use Apache::lonnet;
11:
12: sub BEGIN {
13: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
14: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
15: }
16:
17: sub start_web {
18: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
19: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
20: if ($target eq 'web') {
21: return $bodytext;
22: }
23: return '';
24: }
25:
26: sub end_web {
27: return '';
28: }
29:
30: sub start_tex {
31: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
32: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
33: if ($target eq 'tex') {
34: return $bodytext
35: }
36: return '';
37: }
38:
39: sub end_tex {
40: return '';
41: }
42:
43: sub page_start {
44: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
45: my $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,$parser,$safeeval);
46: my $head_tag_start='<head>'.&Apache::lonxml::registerurl();
47: my $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
48: 'onUnload="'.&Apache::lonxml::unloadevents().'" ';
49: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
50: if ($background) {
51: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
52: $background;
53: $body_tag_start.='background="'.$background.'" ';
54: } else {
55: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
56: if ($bgcolor) {
57: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
58: } else {
59: $body_tag_start.='bgcolor="#ffffff"';
60: }
61: }
62: $body_tag_start.='>';
63: return ($result,$head_tag_start,$body_tag_start);
64: }
65:
66: sub initialize_storage {
67: %Apache::lonhomework::results=();
68: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
69: if ($ENV{'request.state'} eq 'construct') {
70: %Apache::lonhomework::history=
71: &Apache::lonnet::tmprestore($ENV{'request.uri'},'',$domain,$name);
72: my ($temp)=keys %Apache::lonhomework::history ;
73: &Apache::lonxml::debug("Return message of $temp");
74: } else {
75: %Apache::lonhomework::history=
76: &Apache::lonnet::restore($symb,$courseid,$domain,$name);
77: }
78: #ignore error conditions
79: my ($temp)=keys %Apache::lonhomework::history ;
80: if ($temp =~ m/^error:.*/) { %Apache::lonhomework::history=(); }
81: }
82:
83: # -------------------------------------------------------------finalize_storage
84: # Stores away the result has to a student's environment
85: # checks form.grade_ for specific values, other wises stores
86: # to the running users environment
87: sub finalize_storage {
88: my $result;
89: my ($temp) = keys %Apache::lonhomework::results;
90: if ( $temp ne '' ) {
91: my ($symb,$courseid,$domain,$name) = &Apache::lonxml::whichuser();
92: if ($ENV{'request.state'} eq 'construct') {
93: $result=&Apache::lonnet::tmpstore(\%Apache::lonhomework::results,
94: $ENV{'request.uri'},'',$domain,$name);
95: &Apache::lonxml::debug('Construct Store return message:'.$result);
96: } else {
97: $result=&Apache::lonnet::cstore(\%Apache::lonhomework::results,
98: $symb,$courseid,$domain,$name);
99: &Apache::lonxml::debug('Store return message:'.$result);
100: }
101: }
102: return $result;
103: }
104:
105: sub checkout_msg {
106: return (<<ENDCHECKOUT);
107: <h2>The resource needs to be checked out</h2>
108: As a resource gets checked out, a unique timestamped ID is given to it, and a
109: permanent record is left in the system.<p />
110: <font color=red>
111: Checking out resources is subject to course policies, and may exclude future
112: credit even if done erroneously.<p />
113: </font>
114: <form method=post>
115: <input type=button name="doescheckout"
116: value="Check out Exam for Viewing"
117: onClick="if (confirm('Check out Exam?')) { this.form.submit(); }" />
118: </form>
119: ENDCHECKOUT
120: }
121:
122: sub start_problem {
123: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
124:
125: #intialize globals
126: $Apache::inputtags::part='0';
127: @Apache::inputtags::responselist = ();
128: @Apache::inputtags::previous=();
129: &initialize_storage();
130: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
131: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
132: if ($Apache::lonhomework::type eq '') {
133: my $uri=$ENV{'request.uri'};
134: if ($uri=~/\.(\w+)$/) {
135: $Apache::lonhomework::type=$1;
136: &Apache::lonxml::debug("Using type of $1");
137: } else {
138: $Apache::lonhomework::type='problem';
139: &Apache::lonxml::debug("Using default type, problem, :$uri:");
140: }
141: }
142:
143: #added vars to the scripting enviroment
144: my $expression='$external::part='.$Apache::inputtags::part.';';
145: &Apache::run::run($expression,$safeeval);
146: my $status;
147: my $accessmsg;
148:
149: #should get back a <html> or the neccesary stuff to start XML/MathML
150: my ($result,$head_tag_start,$body_tag_start)=
151: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
152:
153:
154: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
155: #handle exam checkout
156: if ($Apache::lonhomework::type eq 'exam') {
157: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
158: if (($ENV{'form.doescheckout'}) && (!$token)) {
159: $token=&Apache::lonxml::maketoken();
160: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
161: }
162: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
163: }
164:
165: #handle rand seed in construction space
166: my $rndseed;
167: if ($ENV{'request.state'} eq "construct") {
168: $rndseed=$ENV{'form.rndseed'};
169: if (!$rndseed) {
170: $rndseed=time;
171: $ENV{'form.rndseed'}=$rndseed;
172: }
173: &Apache::run::run('$external::randomseed='.$rndseed.';',$safeeval);
174: }
175: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
176: push (@Apache::inputtags::status,$status);
177: my $expression='$external::datestatus="'.$status.'";';
178: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
179: &Apache::run::run($expression,$safeeval);
180: if (( $status eq 'CLOSED' ) ||
181: ( $status eq 'UNCHECKEDOUT') ||
182: ( $status eq 'BANNED')) {
183: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
184: if ( $target eq "web" ) {
185: $result.= $head_tag_start.'</head>';
186: my $msg=$body_tag_start.
187: '<h1>Not open to be viewed</h1>';
188: if ($status eq 'CLOSED') {
189: $msg.='The problem '.$accessmsg;
190: } elsif ($status eq 'UNCHECKEDOUT') {
191: $msg.=&checkout_msg;
192: }
193: $result.=$msg.'<br />';
194: }
195: } elsif ($target eq 'web') {
196: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
197: if ($name eq '') {
198: $name=&Apache::lonnet::EXT('resource.title');
199: if ($name eq 'con_lost') { $name = ''; }
200: }
201: $Apache::lonhomework::name=$name;
202: if ($status eq 'CAN_ANSWER') {
203: # create a page header and exit
204: $result.="$head_tag_start<title>$name</title></head>\n
205: $body_tag_start\n
206: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
207: '<input type="hidden" name="submitted" value="yes" />';
208: if ($ENV{'request.state'} eq "construct") {
209: $result.=
210: '<input type="hidden" name="problemmode" value="View" />
211: <input type="submit" name="problemmode" value="Edit" />
212: Random Seed:<input type="text" name="rndseed" width="10" value="'.
213: $rndseed.'" />
214: <input type="submit" name="resetdata" value="Reset Submissions" />
215: <hr />';
216: }
217: # if we are viewing someone else preserve that info
218: if (defined $ENV{'form.grade_symb'}) {
219: foreach my $field ('symb','courseid','domain','username') {
220: $result .= '<input type="hidden" name="grade_'.$field.
221: '" value="'.$ENV{"form.grade_$field"}.'" />'."\n";
222: }
223: }
224: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER'
225: || $status eq 'CLOSED') {
226: $result.=$head_tag_start.
227: "<title>$name</title></head>\n$body_tag_start\n";
228: }
229: }
230: } elsif ($target eq 'edit') {
231: $result.=$head_tag_start."</head>".$body_tag_start.
232: '<form name="lonhomework" method="POST" action="'.
233: $ENV{'request.uri'}.'">
234: <input type="hidden" name="submitted" value="edit" />
235: <input type="hidden" name="problemmode" value="Edit" />
236: <input type="submit" name="problemmode" value="View" />
237: <input type="submit" name="Undo" value="undo" /> <hr />
238: <input type="submit" name="submit" value="Submit Changes" /><br />
239: ';
240: my $temp=&Apache::edit::insertlist($target,$token);
241: $result.=$temp;
242: } elsif ($target eq 'modified') {
243: $result=$token->[4];
244: $result.=&Apache::edit::handle_insert();
245: } else {
246: # page_start returned a starting result, delete it if we don't need it
247: $result = '';
248: }
249: return $result;
250: }
251:
252: sub end_problem {
253: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
254: my $result='';
255: my $status=$Apache::inputtags::status['-1'];
256: if ($target eq 'grade' || $target eq 'web' || $target eq 'answer' ) {
257: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
258: $status eq 'CAN_ANSWER') {
259: # if part is zero, no <part>s existed, so we need to the grading
260: &Apache::inputtags::grade;
261: } elsif ( $target eq 'web' && $Apache::inputtags::part eq '0') {
262: # if part is zero, no <part>s existed, so we need show the current
263: # grading status
264: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
265: }
266: if (
267: ($target eq 'web' && ($ENV{'request.state'} ne 'construct')) ||
268: ($target eq 'answer')
269: ) {
270: if ($status eq 'CAN_ANSWER') {
271: $result.="</form></body>\n";
272: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
273: $result.="</body>\n";
274: }
275: $result.=&Apache::lonxml::xmlend();
276: }
277: if ($target eq 'grade') {
278: &Apache::lonhomework::showhash(%Apache::lonhomework::results);
279: &finalize_storage();
280: }
281: } elsif ($target eq 'meta') {
282: if ($Apache::inputtags::part eq '0') {
283: $result=&Apache::response::mandatory_part_meta;
284: }
285: } elsif ($target eq 'edit') {
286: &Apache::lonxml::debug("in end_problem with $target, edit");
287: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
288: }
289: return $result;
290: }
291:
292: sub start_library {
293: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
294: my ($result,$head_tag_start,$body_tag_start)=
295: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
296: if ($target eq 'edit') {
297: $result.=$head_tag_start."</head>".$body_tag_start.
298: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
299: <input type="hidden" name="submitted" value="edit" />
300: <input type="hidden" name="problemmode" value="Edit" />
301: <input type="submit" name="problemmode" value="View" />
302: <input type="submit" name="Undo" value="undo" /> <hr />
303: ';
304: my $temp=&Apache::edit::insertlist($target,$token);
305: $result.=$temp;
306: return $result;
307: }
308: if ($target eq 'modified') {
309: $result=$token->[4];
310: $result.=&Apache::edit::handle_insert();
311: return $result;
312: }
313: return '';
314: }
315:
316: sub end_library {
317: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
318: my $result='';
319: if ($target eq 'edit') {
320: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
321: }
322: return $result;
323: }
324:
325: sub start_block {
326: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
327:
328: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
329: my $code = @$parstack[$#$parstack];
330: $code =~ s/\"//g;
331: $code .=';return $condition;';
332: # print "<br />$code<br />";
333: my $result = &Apache::run::run($code,$safeeval);
334: &Apache::lonxml::debug("block :$code: returned :$result:");
335: if ( ! $result ) {
336: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
337: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
338: }
339: }
340: return "";
341: }
342:
343: sub end_block {
344: return '';
345: }
346:
347: sub start_while {
348: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
349:
350: my $code = @$parstack[$#$parstack];
351: $code =~ s/\"//g;
352: $code .=';return $condition;';
353:
354: push( @Apache::structuretags::whileconds, $code);
355: my $result = &Apache::run::run($code,$safeeval);
356: my $bodytext=$$parser[$#$parser]->get_text("/while");
357: push( @Apache::structuretags::whilebody, $bodytext);
358: if ( $result ) {
359: &Apache::lonxml::newparser($parser,\$bodytext);
360: }
361: return "";
362: }
363:
364: sub end_while {
365: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
366: my $code = pop @Apache::structuretags::whileconds;
367: my $bodytext = pop @Apache::structuretags::whilebody;
368: my $result = &Apache::run::run($code,$safeeval);
369: if ( $result ) {
370: &Apache::lonxml::newparser($parser,\$bodytext);
371: }
372: return "";
373: }
374:
375: # <randomlist>
376: # <tag1>..</tag1>
377: # <tag2>..</tag2>
378: # <tag3>..</tag3>
379: # ...
380: # </randomlist>
381: sub start_randomlist {
382: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
383: if ($target eq 'answer' || $target eq 'grade' || $target eq 'web') {
384: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
385: my $b_parser= HTML::TokeParser->new(\$body);
386: my $b_tok;
387: my @randomlist;
388: my $list_item;
389: while($b_tok = $b_parser->get_token() ) {
390: if($b_tok->[0] eq 'S') { # start tag
391: # get content of the tag until matching end tag
392: # get all text upto the matching tag
393: # and push the content into @randomlist
394: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
395: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
396: push(@randomlist,$list_item);
397: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
398: }
399: if($b_tok->[0] eq 'T') { # text
400: # what to do with text in between tags?
401: # print "<b>TEXT $b_tok->[1]</b><br />";
402: }
403: # if($b_tok->[0] eq 'E') { # end tag, should not happen
404: # print "<b>END-TAG $b_tok->[1]</b><br />";
405: # }
406: }
407:
408: my @idx_arr = (0 .. $#randomlist);
409: &Apache::structuretags::shuffle(\@idx_arr);
410: my $bodytext = '';
411: for(0 .. $#randomlist) {
412: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
413: }
414: &Apache::lonxml::newparser($parser,\$bodytext);
415: }
416: return "";
417: }
418:
419: sub shuffle {
420: my $a=shift;
421: my $i;
422: if (defined(@$a)) {
423: &Apache::response::setrandomnumber();
424: for($i=@$a;--$i;) {
425: my $j=int rand($i+1);
426: next if $i == $j;
427: @$a[$i,$j] = @$a[$j,$i];
428: }
429: }
430: }
431:
432: sub end_randomlist {
433: return '';
434: }
435:
436: sub start_part {
437: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
438: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
439: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
440: $Apache::inputtags::part=$id;
441: @Apache::inputtags::responselist = ();
442: @Apache::inputtags::previous=();
443: if ($target eq 'meta') {
444: return &Apache::response::mandatory_part_meta;
445: } elsif ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
446: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
447: push (@Apache::inputtags::status,$status);
448: my $expression='$external::datestatus="'.$status.'";';
449: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
450: &Apache::run::run($expression,$safeeval);
451: if ( $status eq 'CLOSED' ) {
452: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
453: if ( $target eq "web" ) {
454: return "<br />Part is not open to be viewed. It $accessmsg<br />";
455: }
456: }
457: }
458: return '';
459: }
460:
461: sub end_part {
462: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
463: &Apache::lonxml::debug("in end_part $target ");
464: my $status=$Apache::inputtags::status['-1'];
465: pop @Apache::inputtags::status;
466: if ( $target eq 'meta' ) { return ''; }
467: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
468: return &Apache::inputtags::grade;
469: }
470: if ($target eq 'web') {
471: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
472: }
473: return '';
474: }
475:
476: sub start_preduedate {
477: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
478: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
479: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
480: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
481: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
482: }
483: }
484: return '';
485: }
486:
487: sub end_preduedate {
488: return '';
489: }
490:
491: sub start_postanswerdate {
492: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
493: if ($target eq 'web' || $target eq 'grade') {
494: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
495: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
496: }
497: }
498: return '';
499: }
500:
501: sub end_postanswerdate {
502: return '';
503: }
504:
505: sub start_notsolved {
506: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
507: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
508: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
509: &Apache::lonxml::debug("not solved has :$gradestatus:");
510: if ($gradestatus =~ /^correct/) {
511: &Apache::lonxml::debug("skipping");
512: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
513: }
514: }
515: return '';
516: }
517:
518: sub end_notsolved {
519: return '';
520: }
521:
522: sub start_solved {
523: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
524: if ($target eq 'web' || $target eq 'grade' || $target eq 'answer') {
525: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
526: if ($gradestatus !~ /^correct/) {
527: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
528: }
529: }
530: return '';
531: }
532:
533: sub end_solved {
534: return '';
535: }
536:
537: sub start_startouttext {
538: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
539: my @result=(''.'');
540: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
541: return (@result);
542: }
543: sub end_startouttext {
544: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
545: my $result='';
546: my $text='';
547:
548: if ($target eq 'edit') {
549: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[-1]);
550: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
551: <td>Delete:".
552: &Apache::edit::deletelist($target,$token)
553: ."</td>
554: <td>".
555: &Apache::edit::insertlist($target,$token).
556: "</td>
557: </tr><tr><td colspan=\"3\">\n".
558: &Apache::edit::editfield($token->[1],$text,"",50,4);
559: }
560: if ($target eq 'modified') {
561: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
562: $result='<startouttext />'.&Apache::edit::modifiedfield();
563: }
564: return $result;
565: }
566: sub start_endouttext {
567: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
568: my $result='';
569: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
570: if ($target eq "modified") { $result='<endouttext />'; }
571: return $result;
572: }
573: sub end_endouttext {
574: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
575: my @result=('','');
576: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
577: return (@result);
578: }
579: sub delete_startouttext {
580: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
581: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
582: my $text=$$parser['-1']->get_text("/endouttext");
583: my $ntoken=$$parser['-1']->get_token();
584: &Apache::lonxml::debug("Deleting :$text: and :$ntoken->[0]:$ntoken->[1]:$ntoken->[2]: for startouttext");
585: &Apache::lonxml::end_tag($tagstack,$parstack,$ntoken);
586: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
587: # they did the last time round
588: &Apache::lonxml::increasedepth($ntoken);
589: &Apache::lonxml::decreasedepth($ntoken);
590: return 1;
591: }
592:
593: 1;
594: __END__
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