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 start_problem {
67: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
68:
69: #intialize globals
70: $Apache::inputtags::part='0';
71: @Apache::inputtags::responselist = ();
72: @Apache::inputtags::previous=();
73: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
74: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
75: if ($Apache::lonhomework::type eq '') {
76: my $uri=$ENV{'request.uri'};
77: if ($uri=~/\.(\w+)$/) {
78: $Apache::lonhomework::type=$1;
79: &Apache::lonxml::debug("Using type of $1");
80: } else {
81: $Apache::lonhomework::type='problem';
82: &Apache::lonxml::debug("Using default type, problem, :$uri:");
83: }
84: }
85:
86: #adeed vars to the scripting enviroment
87: my $expression='$external::part='.$Apache::inputtags::part.';';
88: &Apache::run::run($expression,$safeeval);
89: my $status;
90: my $accessmsg;
91:
92: #should get back a <html> or the neccesary stuff to start XML/MathML
93: my ($result,$head_tag_start,$body_tag_start)=
94: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
95:
96: if ($Apache::lonhomework::type eq 'exam') {
97: if ($target eq 'web') {
98: my $token=$Apache::lonhomework::history{"resource.0.outtoken"};
99: if (($ENV{'form.doescheckout'}) && (!$token)) {
100: $token=&Apache::lonxml::maketoken();
101: $Apache::lonhomework::history{"resource.0.outtoken"}=$token;
102: }
103: $body_tag_start.=&Apache::lonxml::printtokenheader($target,$token);
104: }
105: if ($target eq 'meta') {
106:
107: return (<<ENDSTORES);
108: <stores part="0" name="outtoken" type="string"
109: display="Document ID checked out"></stores>
110: <stores part="0" name="checkouttime" type="date"
111: display="Time checked out"></stores>
112: <stores part="0" name="outremote" type="string"
113: display="Client IP checked out from"></stores>
114:
115: <stores part="0" name="intoken" type="string"
116: display="Document ID checked in"></stores>
117: <stores part="0" name="checkintime" type="date"
118: display="Time checked in"></stores>
119: <stores part="0" name="inremote" type="string"
120: display="Client IP checked in from"></stores>
121: ENDSTORES
122: }
123: }
124: if ($target eq 'web' || $target eq 'grade') {
125: ($status,$accessmsg) = &Apache::lonhomework::check_access('0');
126: push (@Apache::inputtags::status,$status);
127: my $expression='$external::datestatus="'.$status.'";';
128: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
129: &Apache::run::run($expression,$safeeval);
130: if (( $status eq 'CLOSED' ) ||
131: ( $status eq 'UNCHECKEDOUT') ||
132: ( $status eq 'BANNED')) {
133: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
134: if ( $target eq "web" ) {
135: $result.= $head_tag_start.'</head>';
136: my $msg=$body_tag_start.
137: '<h1>Not open to be viewed</h1>';
138: if ($status eq 'CLOSED') {
139: $msg.='The problem '.$accessmsg;
140: } elsif ($status eq 'UNCHECKEDOUT') {
141: $msg.=(<<ENDCHECKOUT);
142: <h2>The resource needs to be checked out</h2>
143: As a resource gets checked out, a unique timestamped ID is given to it, and a
144: permanent record is left in the system.<p />
145: <font color=red>
146: Checking out resources is subject to course policies, and may exclude future
147: credit even if done erroneously.<p />
148: </font>
149: <form method=post>
150: <input type=button name="doescheckout"
151: value="Check out Exam for Viewing"
152: onClick="if (confirm('Check out Exam?')) { this.form.submit(); }" />
153: </form>
154: ENDCHECKOUT
155: }
156: return $result.$msg.'<br />';
157: }
158: }
159: }
160: if ($target eq 'web') {
161: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
162: if ($name eq '') {
163: $name=&Apache::lonnet::EXT('resource.title');
164: if ($name eq 'con_lost') { $name = ''; }
165: }
166: $Apache::lonhomework::name=$name;
167: if ($status eq 'CAN_ANSWER') {
168: # create a page header and exit
169: $result.="$head_tag_start<title>$name</title></head>\n
170: $body_tag_start\n
171: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
172: '<input type="hidden" name="submitted" value="yes" />';
173: if ($ENV{'request.state'} eq "construct") {
174: $result.='<input type="hidden" name="problemmode" value="View" />
175: <input type="submit" name="problemmode" value="Edit" /><hr />';
176: }
177: return $result;
178: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
179: return $result.$head_tag_start."<title>$name</title></head>\n$body_tag_start\n";
180: }
181: }
182: if ($target eq 'edit') {
183: $result.=$head_tag_start."</head>".$body_tag_start.
184: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
185: <input type="hidden" name="submitted" value="edit" />
186: <input type="hidden" name="problemmode" value="Edit" />
187: <input type="submit" name="problemmode" value="View" />
188: <input type="submit" name="Undo" value="undo" /> <hr />
189: <input type="submit" name="submit" value="Submit Changes" /><br />
190: ';
191: my $temp=&Apache::edit::insertlist($target,$token);
192: $result.=$temp;
193: return $result;
194: }
195: if ($target eq 'modified') {
196: $result=$token->[4];
197: $result.=&Apache::edit::handle_insert();
198: return $result;
199: }
200: return '';
201: }
202:
203: sub end_problem {
204: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
205: my $result='';
206: my $status=$Apache::inputtags::status['-1'];
207: if ($target eq 'grade' || $target eq 'web' ) {
208: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
209: $status eq 'CAN_ANSWER') {
210: # if part is zero, no <part>s existed, so we need to the grading
211: &Apache::inputtags::grade;
212: } elsif ($Apache::inputtags::part eq '0') {
213: # if part is zero, no <part>s existed, so we need show the current
214: # grading status
215: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
216: }
217: if ($target eq 'web') {
218: if ($status eq 'CAN_ANSWER') {
219: $result.="</form></body>\n";
220: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
221: $result.="</body>\n";
222: }
223: $result.=&Apache::lonxml::xmlend();
224: }
225: }
226: if ($target eq 'meta') {
227: if ($Apache::inputtags::part eq '0') {
228: $result=&Apache::response::mandatory_part_meta;
229: }
230: }
231: if ($target eq 'edit') {
232: &Apache::lonxml::debug("in end_problem with $target, edit");
233: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
234: }
235: return $result;
236: }
237:
238: sub start_library {
239: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
240: my ($result,$head_tag_start,$body_tag_start)=
241: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
242: if ($target eq 'edit') {
243: $result.=$head_tag_start."</head>".$body_tag_start.
244: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
245: <input type="hidden" name="submitted" value="edit" />
246: <input type="hidden" name="problemmode" value="Edit" />
247: <input type="submit" name="problemmode" value="View" />
248: <input type="submit" name="Undo" value="undo" /> <hr />
249: ';
250: my $temp=&Apache::edit::insertlist($target,$token);
251: $result.=$temp;
252: return $result;
253: }
254: if ($target eq 'modified') {
255: $result=$token->[4];
256: $result.=&Apache::edit::handle_insert();
257: return $result;
258: }
259: return '';
260: }
261:
262: sub end_library {
263: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
264: my $result='';
265: if ($target eq 'edit') {
266: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
267: }
268: return $result;
269: }
270:
271: sub start_block {
272: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
273:
274: if ($target eq 'web' || $target eq 'grade') {
275: my $code = @$parstack[$#$parstack];
276: $code =~ s/\"//g;
277: $code .=';return $condition;';
278: # print "<br />$code<br />";
279: my $result = &Apache::run::run($code,$safeeval);
280: &Apache::lonxml::debug("block :$code: returned :$result:");
281: if ( ! $result ) {
282: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
283: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
284: }
285: }
286: return "";
287: }
288:
289: sub end_block {
290: return '';
291: }
292:
293: sub start_while {
294: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
295:
296: my $code = @$parstack[$#$parstack];
297: $code =~ s/\"//g;
298: $code .=';return $condition;';
299:
300: push( @Apache::structuretags::whileconds, $code);
301: my $result = &Apache::run::run($code,$safeeval);
302: my $bodytext=$$parser[$#$parser]->get_text("/while");
303: push( @Apache::structuretags::whilebody, $bodytext);
304: if ( $result ) {
305: &Apache::lonxml::newparser($parser,\$bodytext);
306: }
307: return "";
308: }
309:
310: sub end_while {
311: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
312: my $code = pop @Apache::structuretags::whileconds;
313: my $bodytext = pop @Apache::structuretags::whilebody;
314: my $result = &Apache::run::run($code,$safeeval);
315: if ( $result ) {
316: &Apache::lonxml::newparser($parser,\$bodytext);
317: }
318: return "";
319: }
320:
321: # <randomlist>
322: # <tag1>..</tag1>
323: # <tag2>..</tag2>
324: # <tag3>..</tag3>
325: # ...
326: # </randomlist>
327: sub start_randomlist {
328: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
329: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
330: my $b_parser= HTML::TokeParser->new(\$body);
331: my $b_tok;
332: my @randomlist;
333: my $list_item;
334:
335: while($b_tok = $b_parser->get_token() ) {
336: if($b_tok->[0] eq 'S') { # start tag
337: # get content of the tag until matching end tag
338: # get all text upto the matching tag
339: # and push the content into @randomlist
340: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
341: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
342: push(@randomlist,$list_item);
343: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
344: }
345: if($b_tok->[0] eq 'T') { # text
346: # what to do with text in between tags?
347: # print "<b>TEXT $b_tok->[1]</b><br />";
348: }
349: # if($b_tok->[0] eq 'E') { # end tag, should not happen
350: # print "<b>END-TAG $b_tok->[1]</b><br />";
351: # }
352: }
353: my @idx_arr = (0 .. $#randomlist);
354: &Apache::structuretags::shuffle(\@idx_arr);
355: my $bodytext = '';
356: for(0 .. $#randomlist) {
357: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
358: }
359:
360: &Apache::lonxml::newparser($parser,\$bodytext);
361: return "";
362: }
363:
364: sub shuffle {
365: my $a=shift;
366: my $i;
367: &Apache::response::setrandomnumber();
368: for($i=@$a;--$i;) {
369: my $j=int rand($i+1);
370: next if $i == $j;
371: @$a[$i,$j] = @$a[$j,$i];
372: }
373: }
374:
375: sub end_randomlist {
376: return '';
377: }
378:
379: sub start_part {
380: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
381: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
382: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
383: $Apache::inputtags::part=$id;
384: @Apache::inputtags::responselist = ();
385: @Apache::inputtags::previous=();
386: if ($target eq 'meta') {
387: return &Apache::response::mandatory_part_meta;
388: } elsif ($target eq 'web' || $target eq 'grade') {
389: my ($status,$accessmsg) = &Apache::lonhomework::check_access($id);
390: push (@Apache::inputtags::status,$status);
391: my $expression='$external::datestatus="'.$status.'";';
392: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
393: &Apache::run::run($expression,$safeeval);
394: if ( $status eq 'CLOSED' ) {
395: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
396: if ( $target eq "web" ) {
397: return "<br />Part is not open to be viewed. It $accessmsg<br />";
398: }
399: }
400: }
401: return '';
402: }
403:
404: sub end_part {
405: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
406: &Apache::lonxml::debug("in end_part $target ");
407: my $status=$Apache::inputtags::status['-1'];
408: pop @Apache::inputtags::status;
409: if ( $target eq 'meta' ) { return ''; }
410: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
411: return &Apache::inputtags::grade;
412: }
413: if ($target eq 'web') {
414: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
415: }
416: return '';
417: }
418:
419: sub start_preduedate {
420: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
421: if ($target eq 'web' || $target eq 'grade') {
422: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
423: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
424: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
425: }
426: }
427: return '';
428: }
429:
430: sub end_preduedate {
431: return '';
432: }
433:
434: sub start_postanswerdate {
435: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
436: if ($target eq 'web' || $target eq 'grade') {
437: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
438: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
439: }
440: }
441: return '';
442: }
443:
444: sub end_postanswerdate {
445: return '';
446: }
447:
448: sub start_notsolved {
449: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
450: if ($target eq 'web' || $target eq 'grade') {
451: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
452: &Apache::lonxml::debug("not solved has :$gradestatus:");
453: if ($gradestatus =~ /^correct/) {
454: &Apache::lonxml::debug("skipping");
455: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
456: }
457: }
458: return '';
459: }
460:
461: sub end_notsolved {
462: return '';
463: }
464:
465: sub start_solved {
466: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
467: if ($target eq 'web' || $target eq 'grade') {
468: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
469: if ($gradestatus !~ /^correct/) {
470: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
471: }
472: }
473: return '';
474: }
475:
476: sub end_solved {
477: return '';
478: }
479:
480: sub start_startouttext {
481: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
482: my @result=(''.'');
483: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
484: return (@result);
485: }
486: sub end_startouttext {
487: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
488: my $result='';
489: my $text='';
490:
491: if ($target eq 'edit') {
492: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[$#$parser]);
493: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
494: <td>Delete:".
495: &Apache::edit::deletelist($target,$token)
496: ."</td>
497: <td>".
498: &Apache::edit::insertlist($target,$token).
499: "</td>
500: </tr><tr><td colspan=\"3\">\n".
501: &Apache::edit::editfield($token->[1],$text,"",50,4);
502: }
503: if ($target eq 'modified') {
504: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
505: $result='<startouttext />'.&Apache::edit::modifiedfield();
506: }
507: return $result;
508: }
509: sub start_endouttext {
510: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
511: my $result='';
512: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
513: if ($target eq "modified") { $result='<endouttext />'; }
514: return $result;
515: }
516: sub end_endouttext {
517: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
518: my @result=('','');
519: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
520: return (@result);
521: }
522: sub delete_startouttext {
523: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
524: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
525: my $text=$$parser['-1']->get_text("/endouttext");
526: my $token=$$parser['-1']->get_token();
527: &Apache::lonxml::debug("Deleting :$text: and :$token->[0]:$token->[1]:$token->[2]: for startouttext");
528: &Apache::lonxml::end_tag($tagstack,$parstack,$token);
529: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
530: # they did the last time round
531: &Apache::lonxml::increasedepth($token);
532: &Apache::lonxml::decreasedepth($token);
533: return 1;
534: }
535:
536: 1;
537: __END__
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