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 $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
46: 'onUnload="'.&Apache::lonxml::unloadevents().'" '.
47: 'bgcolor="#FFFFFF">';
48: return ($result,$head_tag_start,$body_tag_start);
49: }
50:
51: sub start_problem {
52: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
53:
54: #intialize globals
55: $Apache::inputtags::part='0';
56: @Apache::inputtags::responselist = ();
57: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
58: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
59: if ($Apache::lonhomework::type eq '') {
60: $Apache::lonhomework::type='homework';
61: }
62: #adeed vars to the scripting enviroment
63: my $expression='$external::part='.$Apache::inputtags::part.';';
64: &Apache::run::run($expression,$safeeval);
65: my $status;
66: my $datemsg;
67:
68: #should get back a <html> or the neccesary stuff to start XML/MathML
69: my ($result,$head_tag_start,$body_tag_start)=
70: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
71:
72: if ($target eq 'web' || $target eq 'grade') {
73: ($status,$datemsg) = &Apache::lonhomework::check_date('0');
74: push (@Apache::inputtags::status,$status);
75: my $expression='$external::datestatus="'.$status.'";';
76: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
77: &Apache::run::run($expression,$safeeval);
78: if ( $status eq 'CLOSED' ) {
79: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
80: if ( $target eq "web" ) {
81: $result.= $head_tag_start.'</head>';
82: return $result . $body_tag_start .
83: " <br />Problem is not open to be viewed. The problem $datemsg<br />";
84: }
85: }
86: }
87: if ($target eq 'web') {
88: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
89: if ($name eq '') {
90: $name=&Apache::lonnet::EXT('resource.title');
91: if ($name eq 'con_lost') { $name = ''; }
92: }
93: $Apache::lonhomework::name=$name;
94: if ($status eq 'CAN_ANSWER') {
95: # create a page header and exit
96: $result.="$head_tag_start<title>$name</title></head>\n
97: $body_tag_start\n
98: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
99: '<input type="hidden" name="submitted" value="yes" />';
100: if ($ENV{'request.state'} eq "construct") {
101: $result.='<input type="hidden" name="problemmode" value="View" />
102: <input type="submit" name="problemmode" value="Edit" /><hr />';
103: }
104: return $result;
105: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
106: return $result.$head_tag_start."<title>$name</title></head>\n$body_tag_start\n";
107: }
108: }
109: if ($target eq 'edit') {
110: $result.=$head_tag_start."</head>".$body_tag_start.
111: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
112: <input type="hidden" name="submitted" value="edit" />
113: <input type="hidden" name="problemmode" value="Edit" />
114: <input type="submit" name="problemmode" value="View" />
115: <input type="submit" name="Undo" value="undo" /> <hr />
116: ';
117: my $temp=&Apache::edit::insertlist($target,$token);
118: $result.=$temp;
119: return $result;
120: }
121: if ($target eq 'modified') {
122: $result=$token->[4];
123: $result.=&Apache::edit::handle_insert();
124: return $result;
125: }
126: return '';
127: }
128:
129: sub end_problem {
130: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
131: my $result='';
132: my $status=$Apache::inputtags::status['-1'];
133: if ($target eq 'grade' || $target eq 'web' ) {
134: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
135: $status eq 'CAN_ANSWER') {
136: # if part is zero, no <part>s existed, so we need to the grading
137: &Apache::inputtags::grade;
138: } elsif ($Apache::inputtags::part eq '0') {
139: # if part is zero, no <part>s existed, so we need show the current
140: # grading status
141: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
142: }
143: if ($target eq 'web') {
144: if ($status eq 'CAN_ANSWER') {
145: $result.="</form></body>\n";
146: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
147: $result.="</body>\n";
148: }
149: }
150: }
151: if ($target eq 'meta') {
152: if ($Apache::inputtags::part eq '0') {
153: $result=&Apache::response::mandatory_part_meta;
154: }
155: }
156: if ($target eq 'edit') {
157: &Apache::lonxml::debug("in end_problem with $target, edit");
158: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
159: }
160: return $result;
161: }
162:
163: sub start_library {
164: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
165: my ($result,$head_tag_start,$body_tag_start)=
166: &page_start($target,$token,$tagstack,$parstack,$parser,$safeeval);
167: if ($target eq 'edit') {
168: $result.=$head_tag_start."</head>".$body_tag_start.
169: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
170: <input type="hidden" name="submitted" value="edit" />
171: <input type="hidden" name="problemmode" value="Edit" />
172: <input type="submit" name="problemmode" value="View" />
173: <input type="submit" name="Undo" value="undo" /> <hr />
174: ';
175: my $temp=&Apache::edit::insertlist($target,$token);
176: $result.=$temp;
177: return $result;
178: }
179: if ($target eq 'modified') {
180: $result=$token->[4];
181: $result.=&Apache::edit::handle_insert();
182: return $result;
183: }
184: return '';
185: }
186:
187: sub end_library {
188: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
189: my $result='';
190: if ($target eq 'edit') {
191: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
192: }
193: return $result;
194: }
195:
196: sub start_block {
197: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
198:
199: if ($target eq 'web' || $target eq 'grade') {
200: my $code = @$parstack[$#$parstack];
201: $code =~ s/\"//g;
202: $code .=';return $condition;';
203: # print "<br />$code<br />";
204: my $result = &Apache::run::run($code,$safeeval);
205: &Apache::lonxml::debug("block :$code: returned :$result:");
206: if ( ! $result ) {
207: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
208: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
209: }
210: }
211: return "";
212: }
213:
214: sub end_block {
215: return '';
216: }
217:
218: sub start_while {
219: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
220:
221: my $code = @$parstack[$#$parstack];
222: $code =~ s/\"//g;
223: $code .=';return $condition;';
224:
225: push( @Apache::structuretags::whileconds, $code);
226: my $result = &Apache::run::run($code,$safeeval);
227: my $bodytext=$$parser[$#$parser]->get_text("/while");
228: push( @Apache::structuretags::whilebody, $bodytext);
229: if ( $result ) {
230: &Apache::lonxml::newparser($parser,\$bodytext);
231: }
232: return "";
233: }
234:
235: sub end_while {
236: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
237: my $code = pop @Apache::structuretags::whileconds;
238: my $bodytext = pop @Apache::structuretags::whilebody;
239: my $result = &Apache::run::run($code,$safeeval);
240: if ( $result ) {
241: &Apache::lonxml::newparser($parser,\$bodytext);
242: }
243: return "";
244: }
245:
246: # <randomlist>
247: # <tag1>..</tag1>
248: # <tag2>..</tag2>
249: # <tag3>..</tag3>
250: # ...
251: # </randomlist>
252: sub start_randomlist {
253: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
254: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
255: my $b_parser= HTML::TokeParser->new(\$body);
256: my $b_tok;
257: my @randomlist;
258: my $list_item;
259:
260: while($b_tok = $b_parser->get_token() ) {
261: if($b_tok->[0] eq 'S') { # start tag
262: # get content of the tag until matching end tag
263: # get all text upto the matching tag
264: # and push the content into @randomlist
265: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
266: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
267: push(@randomlist,$list_item);
268: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
269: }
270: if($b_tok->[0] eq 'T') { # text
271: # what to do with text in between tags?
272: # print "<b>TEXT $b_tok->[1]</b><br />";
273: }
274: # if($b_tok->[0] eq 'E') { # end tag, should not happen
275: # print "<b>END-TAG $b_tok->[1]</b><br />";
276: # }
277: }
278: my @idx_arr = (0 .. $#randomlist);
279: &Apache::structuretags::shuffle(\@idx_arr);
280: my $bodytext = '';
281: for(0 .. $#randomlist) {
282: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
283: }
284:
285: &Apache::lonxml::newparser($parser,\$bodytext);
286: return "";
287: }
288:
289: sub shuffle {
290: my $a=shift;
291: my $i;
292: for($i=@$a;--$i;) {
293: my $j=int rand($i+1);
294: next if $i == $j;
295: @$a[$i,$j] = @$a[$j,$i];
296: }
297: }
298:
299: sub end_randomlist {
300: return '';
301: }
302:
303: sub start_part {
304: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
305: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
306: if ($id eq '') { $id = $Apache::lonxml::curdepth; }
307: $Apache::inputtags::part=$id;
308: @Apache::inputtags::responselist = ();
309: if ($target eq 'meta') {
310: return &Apache::response::mandatory_part_meta;
311: } elsif ($target eq 'web' || $target eq 'grade') {
312: my ($status,$datemsg) = &Apache::lonhomework::check_date($id);
313: push (@Apache::inputtags::status,$status);
314: my $expression='$external::datestatus="'.$status.'";';
315: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
316: &Apache::run::run($expression,$safeeval);
317: if ( $status eq 'CLOSED' ) {
318: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
319: if ( $target eq "web" ) {
320: return "<br />Part is not open to be viewed. It $datemsg<br />";
321: }
322: }
323: }
324: return '';
325: }
326:
327: sub end_part {
328: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
329: &Apache::lonxml::debug("in end_part $target ");
330: my $status=$Apache::inputtags::status['-1'];
331: pop @Apache::inputtags::status;
332: if ( $target eq 'meta' ) { return ''; }
333: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
334: return &Apache::inputtags::grade;
335: }
336: if ($target eq 'web') {
337: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
338: }
339: return '';
340: }
341:
342: sub start_preduedate {
343: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
344: if ($target eq 'web' || $target eq 'grade') {
345: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
346: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
347: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
348: }
349: }
350: return '';
351: }
352:
353: sub end_preduedate {
354: return '';
355: }
356:
357: sub start_postanswerdate {
358: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
359: if ($target eq 'web' || $target eq 'grade') {
360: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
361: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
362: }
363: }
364: return '';
365: }
366:
367: sub end_postanswerdate {
368: return '';
369: }
370:
371: sub start_notsolved {
372: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
373: if ($target eq 'web' || $target eq 'grade') {
374: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
375: &Apache::lonxml::debug("not solved has :$gradestatus:");
376: if ($gradestatus =~ /^correct/) {
377: &Apache::lonxml::debug("skipping");
378: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
379: }
380: }
381: return '';
382: }
383:
384: sub end_notsolved {
385: return '';
386: }
387:
388: sub start_solved {
389: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
390: if ($target eq 'web' || $target eq 'grade') {
391: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
392: if ($gradestatus !~ /^correct/) {
393: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
394: }
395: }
396: return '';
397: }
398:
399: sub end_solved {
400: return '';
401: }
402:
403: sub start_startouttext {
404: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
405: my @result=(''.'');
406: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
407: return (@result);
408: }
409: sub end_startouttext {
410: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
411: my $result='';
412: my $text='';
413:
414: if ($target eq 'edit') {
415: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[$#$parser]);
416: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
417: <td>Delete:".
418: &Apache::edit::deletelist($target,$token)
419: ."</td>
420: <td>".
421: &Apache::edit::insertlist($target,$token).
422: "</td>
423: </tr><tr><td colspan=\"3\">\n".
424: &Apache::edit::editfield($token->[1],$text,"",50,4);
425: }
426: if ($target eq 'modified') {
427: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
428: $result='<startouttext />'.&Apache::edit::modifiedfield();
429: }
430: return $result;
431: }
432: sub start_endouttext {
433: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
434: my $result='';
435: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
436: if ($target eq "modified") { $result='<endouttext />'; }
437: return $result;
438: }
439: sub end_endouttext {
440: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
441: my @result=('','');
442: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
443: return (@result);
444: }
445: sub delete_startouttext {
446: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
447: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
448: my $text=$$parser['-1']->get_text("/endouttext");
449: my $token=$$parser['-1']->get_token();
450: &Apache::lonxml::debug("Deleting :$text: and :$token->[0]:$token->[1]:$token->[2]: for startouttext");
451: &Apache::lonxml::end_tag($tagstack,$parstack,$token);
452: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
453: # they did the last time round
454: &Apache::lonxml::increasedepth($token);
455: &Apache::lonxml::decreasedepth($token);
456: return 1;
457: }
458:
459: 1;
460: __END__
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