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