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