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: package Apache::structuretags;
6:
7: use strict;
8: use Apache::lonnet;
9:
10: sub BEGIN {
11: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','library','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
12: # &Apache::lonxml::register_insert('problem','',('part','postanswerdate','preduedate'))
13: }
14:
15: sub start_web {
16: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
17: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
18: if ($target eq 'web') {
19: return $bodytext;
20: }
21: return '';
22: }
23:
24: sub end_web {
25: return '';
26: }
27:
28: sub start_tex {
29: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
30: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
31: if ($target eq 'tex') {
32: return $bodytext
33: }
34: return '';
35: }
36:
37: sub end_tex {
38: return '';
39: }
40:
41: sub page_start {
42: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
43: my $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,$parser,$safeeval);
44: my $head_tag_start='<head>'.&Apache::lonxml::registerurl();
45: my $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
46: 'onUnload="'.&Apache::lonxml::unloadevents().'" ';
47: my $background=&Apache::lonxml::get_param('background',$parstack,$safeeval);
48: if ($background) {
49: $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
50: $background;
51: $body_tag_start.='background="'.$background.'" ';
52: } else {
53: my $bgcolor=&Apache::lonxml::get_param('bgcolor',$parstack,$safeeval);
54: if ($bgcolor) {
55: $body_tag_start.='bgcolor="'.$bgcolor.'" ';
56: } else {
57: $body_tag_start.='bgcolor="#ffffff"';
58: }
59: }
60: $body_tag_start.='>';
61: return ($result,$head_tag_start,$body_tag_start);
62: }
63:
64: sub start_problem {
65: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
66:
67: #intialize globals
68: $Apache::inputtags::part='0';
69: @Apache::inputtags::responselist = ();
70: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
71: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
72: if ($Apache::lonhomework::type eq '') {
73: $Apache::lonhomework::type='homework';
74: }
75: #adeed vars to the scripting enviroment
76: my $expression='$external::part='.$Apache::inputtags::part.';';
77: &Apache::run::run($expression,$safeeval);
78: my $status;
79: my $datemsg;
80:
81: #should get back a <html> or the neccesary stuff to start XML/MathML
82: my ($result,$head_tag_start,$body_tag_start)=
83: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
84:
85: if ($target eq 'web' || $target eq 'grade') {
86: ($status,$datemsg) = &Apache::lonhomework::check_date('0');
87: push (@Apache::inputtags::status,$status);
88: my $expression='$external::datestatus="'.$status.'";';
89: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
90: &Apache::run::run($expression,$safeeval);
91: if ( $status eq 'CLOSED' ) {
92: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
93: if ( $target eq "web" ) {
94: $result.= $head_tag_start.'</head>';
95: return $result . $body_tag_start .
96: " <br />Problem is not open to be viewed. The problem $datemsg<br />";
97: }
98: }
99: }
100: if ($target eq 'web') {
101: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
102: if ($name eq '') {
103: $name=&Apache::lonnet::EXT('resource.title');
104: if ($name eq 'con_lost') { $name = ''; }
105: }
106: $Apache::lonhomework::name=$name;
107: if ($status eq 'CAN_ANSWER') {
108: # create a page header and exit
109: $result.="$head_tag_start<title>$name</title></head>\n
110: $body_tag_start\n
111: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
112: '<input type="hidden" name="submitted" value="yes" />';
113: if ($ENV{'request.state'} eq "construct") {
114: $result.='<input type="hidden" name="problemmode" value="View" />
115: <input type="submit" name="problemmode" value="Edit" /><hr />';
116: }
117: return $result;
118: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
119: return $result.$head_tag_start."<title>$name</title></head>\n$body_tag_start\n";
120: }
121: }
122: if ($target eq 'edit') {
123: $result.=$head_tag_start."</head>".$body_tag_start.
124: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
125: <input type="hidden" name="submitted" value="edit" />
126: <input type="hidden" name="problemmode" value="Edit" />
127: <input type="submit" name="problemmode" value="View" />
128: <input type="submit" name="Undo" value="undo" /> <hr />
129: <input type="submit" name="submit" value="Submit Changes" /><br />
130: ';
131: my $temp=&Apache::edit::insertlist($target,$token);
132: $result.=$temp;
133: return $result;
134: }
135: if ($target eq 'modified') {
136: $result=$token->[4];
137: $result.=&Apache::edit::handle_insert();
138: return $result;
139: }
140: return '';
141: }
142:
143: sub end_problem {
144: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
145: my $result='';
146: my $status=$Apache::inputtags::status['-1'];
147: if ($target eq 'grade' || $target eq 'web' ) {
148: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
149: $status eq 'CAN_ANSWER') {
150: # if part is zero, no <part>s existed, so we need to the grading
151: &Apache::inputtags::grade;
152: } elsif ($Apache::inputtags::part eq '0') {
153: # if part is zero, no <part>s existed, so we need show the current
154: # grading status
155: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
156: }
157: if ($target eq 'web') {
158: if ($status eq 'CAN_ANSWER') {
159: $result.="</form></body>\n";
160: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
161: $result.="</body>\n";
162: }
163: $result.=&Apache::lonxml::xmlend();
164: }
165: }
166: if ($target eq 'meta') {
167: if ($Apache::inputtags::part eq '0') {
168: $result=&Apache::response::mandatory_part_meta;
169: }
170: }
171: if ($target eq 'edit') {
172: &Apache::lonxml::debug("in end_problem with $target, edit");
173: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
174: }
175: return $result;
176: }
177:
178: sub start_library {
179: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
180: my ($result,$head_tag_start,$body_tag_start)=
181: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
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: ';
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_library {
203: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
204: my $result='';
205: if ($target eq 'edit') {
206: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
207: }
208: return $result;
209: }
210:
211: sub start_block {
212: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
213:
214: if ($target eq 'web' || $target eq 'grade') {
215: my $code = @$parstack[$#$parstack];
216: $code =~ s/\"//g;
217: $code .=';return $condition;';
218: # print "<br />$code<br />";
219: my $result = &Apache::run::run($code,$safeeval);
220: &Apache::lonxml::debug("block :$code: returned :$result:");
221: if ( ! $result ) {
222: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
223: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
224: }
225: }
226: return "";
227: }
228:
229: sub end_block {
230: return '';
231: }
232:
233: sub start_while {
234: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
235:
236: my $code = @$parstack[$#$parstack];
237: $code =~ s/\"//g;
238: $code .=';return $condition;';
239:
240: push( @Apache::structuretags::whileconds, $code);
241: my $result = &Apache::run::run($code,$safeeval);
242: my $bodytext=$$parser[$#$parser]->get_text("/while");
243: push( @Apache::structuretags::whilebody, $bodytext);
244: if ( $result ) {
245: &Apache::lonxml::newparser($parser,\$bodytext);
246: }
247: return "";
248: }
249:
250: sub end_while {
251: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
252: my $code = pop @Apache::structuretags::whileconds;
253: my $bodytext = pop @Apache::structuretags::whilebody;
254: my $result = &Apache::run::run($code,$safeeval);
255: if ( $result ) {
256: &Apache::lonxml::newparser($parser,\$bodytext);
257: }
258: return "";
259: }
260:
261: # <randomlist>
262: # <tag1>..</tag1>
263: # <tag2>..</tag2>
264: # <tag3>..</tag3>
265: # ...
266: # </randomlist>
267: sub start_randomlist {
268: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
269: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
270: my $b_parser= HTML::TokeParser->new(\$body);
271: my $b_tok;
272: my @randomlist;
273: my $list_item;
274:
275: while($b_tok = $b_parser->get_token() ) {
276: if($b_tok->[0] eq 'S') { # start tag
277: # get content of the tag until matching end tag
278: # get all text upto the matching tag
279: # and push the content into @randomlist
280: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
281: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
282: push(@randomlist,$list_item);
283: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
284: }
285: if($b_tok->[0] eq 'T') { # text
286: # what to do with text in between tags?
287: # print "<b>TEXT $b_tok->[1]</b><br />";
288: }
289: # if($b_tok->[0] eq 'E') { # end tag, should not happen
290: # print "<b>END-TAG $b_tok->[1]</b><br />";
291: # }
292: }
293: my @idx_arr = (0 .. $#randomlist);
294: &Apache::structuretags::shuffle(\@idx_arr);
295: my $bodytext = '';
296: for(0 .. $#randomlist) {
297: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
298: }
299:
300: &Apache::lonxml::newparser($parser,\$bodytext);
301: return "";
302: }
303:
304: sub shuffle {
305: my $a=shift;
306: my $i;
307: for($i=@$a;--$i;) {
308: my $j=int rand($i+1);
309: next if $i == $j;
310: @$a[$i,$j] = @$a[$j,$i];
311: }
312: }
313:
314: sub end_randomlist {
315: return '';
316: }
317:
318: sub start_part {
319: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
320: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
321: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
322: $Apache::inputtags::part=$id;
323: @Apache::inputtags::responselist = ();
324: if ($target eq 'meta') {
325: return &Apache::response::mandatory_part_meta;
326: } elsif ($target eq 'web' || $target eq 'grade') {
327: my ($status,$datemsg) = &Apache::lonhomework::check_date($id);
328: push (@Apache::inputtags::status,$status);
329: my $expression='$external::datestatus="'.$status.'";';
330: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
331: &Apache::run::run($expression,$safeeval);
332: if ( $status eq 'CLOSED' ) {
333: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
334: if ( $target eq "web" ) {
335: return "<br />Part is not open to be viewed. It $datemsg<br />";
336: }
337: }
338: }
339: return '';
340: }
341:
342: sub end_part {
343: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
344: &Apache::lonxml::debug("in end_part $target ");
345: my $status=$Apache::inputtags::status['-1'];
346: pop @Apache::inputtags::status;
347: if ( $target eq 'meta' ) { return ''; }
348: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
349: return &Apache::inputtags::grade;
350: }
351: if ($target eq 'web') {
352: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
353: }
354: return '';
355: }
356:
357: sub start_preduedate {
358: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
359: if ($target eq 'web' || $target eq 'grade') {
360: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
361: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
362: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
363: }
364: }
365: return '';
366: }
367:
368: sub end_preduedate {
369: return '';
370: }
371:
372: sub start_postanswerdate {
373: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
374: if ($target eq 'web' || $target eq 'grade') {
375: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
376: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
377: }
378: }
379: return '';
380: }
381:
382: sub end_postanswerdate {
383: return '';
384: }
385:
386: sub start_notsolved {
387: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
388: if ($target eq 'web' || $target eq 'grade') {
389: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
390: &Apache::lonxml::debug("not solved has :$gradestatus:");
391: if ($gradestatus =~ /^correct/) {
392: &Apache::lonxml::debug("skipping");
393: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
394: }
395: }
396: return '';
397: }
398:
399: sub end_notsolved {
400: return '';
401: }
402:
403: sub start_solved {
404: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
405: if ($target eq 'web' || $target eq 'grade') {
406: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
407: if ($gradestatus !~ /^correct/) {
408: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
409: }
410: }
411: return '';
412: }
413:
414: sub end_solved {
415: return '';
416: }
417:
418: sub start_startouttext {
419: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
420: my @result=(''.'');
421: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
422: return (@result);
423: }
424: sub end_startouttext {
425: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
426: my $result='';
427: my $text='';
428:
429: if ($target eq 'edit') {
430: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[$#$parser]);
431: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
432: <td>Delete:".
433: &Apache::edit::deletelist($target,$token)
434: ."</td>
435: <td>".
436: &Apache::edit::insertlist($target,$token).
437: "</td>
438: </tr><tr><td colspan=\"3\">\n".
439: &Apache::edit::editfield($token->[1],$text,"",50,4);
440: }
441: if ($target eq 'modified') {
442: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
443: $result='<startouttext />'.&Apache::edit::modifiedfield();
444: }
445: return $result;
446: }
447: sub start_endouttext {
448: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
449: my $result='';
450: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
451: if ($target eq "modified") { $result='<endouttext />'; }
452: return $result;
453: }
454: sub end_endouttext {
455: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
456: my @result=('','');
457: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
458: return (@result);
459: }
460: sub delete_startouttext {
461: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
462: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
463: my $text=$$parser['-1']->get_text("/endouttext");
464: my $token=$$parser['-1']->get_token();
465: &Apache::lonxml::debug("Deleting :$text: and :$token->[0]:$token->[1]:$token->[2]: for startouttext");
466: &Apache::lonxml::end_tag($tagstack,$parstack,$token);
467: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
468: # they did the last time round
469: &Apache::lonxml::increasedepth($token);
470: &Apache::lonxml::decreasedepth($token);
471: return 1;
472: }
473:
474: 1;
475: __END__
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