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