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','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 $bodytext
33: }
34: return '';
35: }
36:
37: sub end_tex {
38: return '';
39: }
40:
41: sub start_problem {
42: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
43:
44: #intialize globals
45: $Apache::inputtags::part='0';
46: @Apache::inputtags::responselist = ();
47: $Apache::lonhomework::type=&Apache::lonnet::EXT('resource.0.type');
48: &Apache::lonxml::debug("Found this to be of type :$Apache::lonhomework::type:");
49: if ($Apache::lonhomework::type eq '') {
50: $Apache::lonhomework::type='homework';
51: }
52: #adeed vars to the scripting enviroment
53: my $expression='$external::part='.$Apache::inputtags::part.';';
54: &Apache::run::run($expression,$safeeval);
55: my $status;
56: my $datemsg;
57:
58: #should get back a <html> or the neccesary stuff to start XML/MathML
59: my $result=&Apache::londefdef::start_html($target,$token,$tagstack,$parstack,$parser,$safeeval);
60:
61: my $head_tag_start='<head>'.&Apache::lonxml::registerurl();
62: my $body_tag_start='<body onLoad="'.&Apache::lonxml::loadevents().'" '.
63: 'onUnload="'.&Apache::lonxml::unloadevents().'" '.
64: 'bgcolor="#FFFFFF">';
65: if ($target eq 'web' || $target eq 'grade') {
66: ($status,$datemsg) = &Apache::lonhomework::check_date('0');
67: push (@Apache::inputtags::status,$status);
68: my $expression='$external::datestatus="'.$status.'";';
69: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
70: &Apache::run::run($expression,$safeeval);
71: if ( $status eq 'CLOSED' ) {
72: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
73: if ( $target eq "web" ) {
74: $result.= $head_tag_start.'</head>';
75: return $result . $body_tag_start .
76: " <br />Problem is not open to be viewed. The problem $datemsg<br />";
77: }
78: }
79: }
80: if ($target eq 'web') {
81: my $name= &Apache::lonxml::get_param('name',$parstack,$safeeval);
82: if ($name eq '') {
83: $name=&Apache::lonnet::EXT('resource.title');
84: if ($name eq 'con_lost') { $name = ''; }
85: }
86: $Apache::lonhomework::name=$name;
87: if ($status eq 'CAN_ANSWER') {
88: # create a page header and exit
89: $result.="$head_tag_start<title>$name</title></head>\n
90: $body_tag_start\n
91: <form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".
92: '<input type="hidden" name="submitted" value="yes" />';
93: if ($ENV{'request.state'} eq "construct") {
94: $result.='<input type="hidden" name="problemmode" value="View" />
95: <input type="submit" name="problemmode" value="Edit" /><hr />';
96: }
97: return $result;
98: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
99: return $result.$head_tag_start."<title>$name</title></head>\n$body_tag_start\n";
100: }
101: }
102: if ($target eq 'edit') {
103: $result.=$head_tag_start."</head>".$body_tag_start.
104: '<form name="lonhomework" method="POST" action="'.$ENV{'request.uri'}.'">
105: <input type="hidden" name="submitted" value="edit" />
106: <input type="hidden" name="problemmode" value="Edit" />
107: <input type="submit" name="problemmode" value="View" />
108: <input type="submit" name="Undo" value="undo" /> <hr />
109: ';
110: my $temp=&Apache::edit::insertlist($target,$token);
111: $result.=$temp;
112: return $result;
113: }
114: if ($target eq 'modified') {
115: $result=$token->[4];
116: $result.=&Apache::edit::handle_insert();
117: return $result;
118: }
119: return '';
120: }
121:
122: sub end_problem {
123: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
124: my $result='';
125: my $status=$Apache::inputtags::status['-1'];
126: if ($target eq 'grade' || $target eq 'web' ) {
127: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
128: $status eq 'CAN_ANSWER') {
129: # if part is zero, no <part>s existed, so we need to the grading
130: &Apache::inputtags::grade;
131: } elsif ($Apache::inputtags::part eq '0') {
132: # if part is zero, no <part>s existed, so we need show the current
133: # grading status
134: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
135: }
136: if ($target eq 'web') {
137: if ($status eq 'CAN_ANSWER') {
138: $result.="</form></body>\n";
139: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
140: $result.="</body>\n";
141: }
142: }
143: }
144: if ($target eq 'meta') {
145: if ($Apache::inputtags::part eq '0') {
146: $result=&Apache::response::mandatory_part_meta;
147: }
148: }
149: if ($target eq 'edit') {
150: &Apache::lonxml::debug("in end_problem with $target, edit");
151: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
152: }
153: return $result;
154: }
155:
156: sub start_block {
157: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
158:
159: if ($target eq 'web' || $target eq 'grade') {
160: my $code = @$parstack[$#$parstack];
161: $code =~ s/\"//g;
162: $code .=';return $condition;';
163: # print "<br />$code<br />";
164: my $result = &Apache::run::run($code,$safeeval);
165: &Apache::lonxml::debug("block :$code: returned :$result:");
166: if ( ! $result ) {
167: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
168: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
169: }
170: }
171: return "";
172: }
173:
174: sub end_block {
175: return '';
176: }
177:
178: sub start_while {
179: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
180:
181: my $code = @$parstack[$#$parstack];
182: $code =~ s/\"//g;
183: $code .=';return $condition;';
184:
185: push( @Apache::structuretags::whileconds, $code);
186: my $result = &Apache::run::run($code,$safeeval);
187: my $bodytext=$$parser[$#$parser]->get_text("/while");
188: push( @Apache::structuretags::whilebody, $bodytext);
189: if ( $result ) {
190: &Apache::lonxml::newparser($parser,\$bodytext);
191: }
192: return "";
193: }
194:
195: sub end_while {
196: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
197: my $code = pop @Apache::structuretags::whileconds;
198: my $bodytext = pop @Apache::structuretags::whilebody;
199: my $result = &Apache::run::run($code,$safeeval);
200: if ( $result ) {
201: &Apache::lonxml::newparser($parser,\$bodytext);
202: }
203: return "";
204: }
205:
206: # <randomlist>
207: # <tag1>..</tag1>
208: # <tag2>..</tag2>
209: # <tag3>..</tag3>
210: # ...
211: # </randomlist>
212: sub start_randomlist {
213: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
214: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
215: my $b_parser= HTML::TokeParser->new(\$body);
216: my $b_tok;
217: my @randomlist;
218: my $list_item;
219:
220: while($b_tok = $b_parser->get_token() ) {
221: if($b_tok->[0] eq 'S') { # start tag
222: # get content of the tag until matching end tag
223: # get all text upto the matching tag
224: # and push the content into @randomlist
225: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
226: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
227: push(@randomlist,$list_item);
228: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
229: }
230: if($b_tok->[0] eq 'T') { # text
231: # what to do with text in between tags?
232: # print "<b>TEXT $b_tok->[1]</b><br />";
233: }
234: # if($b_tok->[0] eq 'E') { # end tag, should not happen
235: # print "<b>END-TAG $b_tok->[1]</b><br />";
236: # }
237: }
238: my @idx_arr = (0 .. $#randomlist);
239: &Apache::structuretags::shuffle(\@idx_arr);
240: my $bodytext = '';
241: for(0 .. $#randomlist) {
242: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
243: }
244:
245: &Apache::lonxml::newparser($parser,\$bodytext);
246: return "";
247: }
248:
249: sub shuffle {
250: my $a=shift;
251: my $i;
252: for($i=@$a;--$i;) {
253: my $j=int rand($i+1);
254: next if $i == $j;
255: @$a[$i,$j] = @$a[$j,$i];
256: }
257: }
258:
259: sub end_randomlist {
260: return '';
261: }
262:
263: sub start_part {
264: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
265: my $id= &Apache::lonxml::get_param('id',$parstack,$safeeval);
266: $Apache::inputtags::part=$id;
267: @Apache::inputtags::responselist = ();
268: if ($target eq 'meta') {
269: return &Apache::response::mandatory_part_meta;
270: } elsif ($target eq 'web' || $target eq 'grade') {
271: my ($status,$datemsg) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
272: push (@Apache::inputtags::status,$status);
273: my $expression='$external::datestatus="'.$status.'";';
274: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
275: &Apache::run::run($expression,$safeeval);
276: if ( $status eq 'CLOSED' ) {
277: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
278: if ( $target eq "web" ) {
279: return "<br />Part is not open to be viewed. It $datemsg<br />";
280: }
281: }
282: }
283: return '';
284: }
285:
286: sub end_part {
287: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
288: &Apache::lonxml::debug("in end_part $target ");
289: my $status=$Apache::inputtags::status['-1'];
290: pop @Apache::inputtags::status;
291: if ( $target eq 'meta' ) { return ''; }
292: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
293: return &Apache::inputtags::grade;
294: }
295: if ($target eq 'web') {
296: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
297: }
298: return '';
299: }
300:
301: sub start_preduedate {
302: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
303: if ($target eq 'web' || $target eq 'grade') {
304: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
305: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
306: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
307: }
308: }
309: return '';
310: }
311:
312: sub end_preduedate {
313: return '';
314: }
315:
316: sub start_postanswerdate {
317: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
318: if ($target eq 'web' || $target eq 'grade') {
319: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
320: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
321: }
322: }
323: return '';
324: }
325:
326: sub end_postanswerdate {
327: return '';
328: }
329:
330: sub start_notsolved {
331: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
332: if ($target eq 'web' || $target eq 'grade') {
333: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
334: &Apache::lonxml::debug("not solved has :$gradestatus:");
335: if ($gradestatus =~ /^correct/) {
336: &Apache::lonxml::debug("skipping");
337: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
338: }
339: }
340: return '';
341: }
342:
343: sub end_notsolved {
344: return '';
345: }
346:
347: sub start_solved {
348: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
349: if ($target eq 'web' || $target eq 'grade') {
350: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
351: if ($gradestatus !~ /^correct/) {
352: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
353: }
354: }
355: return '';
356: }
357:
358: sub end_solved {
359: return '';
360: }
361:
362: sub start_startouttext {
363: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
364: my @result=(''.'');
365: if ($target eq 'edit' || $target eq 'modified' ) { @result=('','no'); }
366: return (@result);
367: }
368: sub end_startouttext {
369: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
370: my $result='';
371: my $text='';
372:
373: if ($target eq 'edit') {
374: $text=&Apache::lonxml::get_all_text("endouttext",$$parser[$#$parser]);
375: $result.=&Apache::edit::start_table($token)."<tr><td>Text Block</td>
376: <td>Delete:".
377: &Apache::edit::deletelist($target,$token)
378: ."</td>
379: <td>".
380: &Apache::edit::insertlist($target,$token).
381: "</td>
382: </tr><tr><td colspan=\"3\">\n".
383: &Apache::edit::editfield($token->[1],$text,"",50,4);
384: }
385: if ($target eq 'modified') {
386: $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
387: $result='<startouttext />'.&Apache::edit::modifiedfield();
388: }
389: return $result;
390: }
391: sub start_endouttext {
392: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
393: my $result='';
394: if ($target eq "edit" ) { $result="</td></tr>".&Apache::edit::end_table()."\n"; }
395: if ($target eq "modified") { $result='<endouttext />'; }
396: return $result;
397: }
398: sub end_endouttext {
399: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
400: my @result=('','');
401: if ($target eq "edit" || $target eq 'modified') { @result=('','no'); }
402: return (@result);
403: }
404: sub delete_startouttext {
405: my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
406: # my $text=&Apache::lonxml::get_all_text("endouttext",$$parser['-1']);
407: my $text=$$parser['-1']->get_text("/endouttext");
408: my $token=$$parser['-1']->get_token();
409: &Apache::lonxml::debug("Deleting :$text: and :$token->[0]:$token->[1]:$token->[2]: for startouttext");
410: &Apache::lonxml::end_tag($tagstack,$parstack,$token);
411: # Deleting 2 parallel tag pairs, but we need the numbers later to look like
412: # they did the last time round
413: &Apache::lonxml::increasedepth($token);
414: &Apache::lonxml::decreasedepth($token);
415: return 1;
416: }
417:
418: 1;
419: __END__
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