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