1: # The LearningOnline Network with CAPA
2: # definition of tags that give a structure to a document
3: # 2/19 Guy
4: package Apache::structuretags;
5:
6: use strict;
7: use Apache::lonnet;
8:
9: sub BEGIN {
10: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','web','tex','part','preduedate','postanswerdate','solved','notsolved','startouttext','endouttext'));
11: }
12:
13: sub start_web {
14: my ($target,$token,$parstack,$parser,$safeeval)=@_;
15: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
16: if ($target eq 'web') {
17: return $bodytext;
18: }
19: return '';
20: }
21:
22: sub end_web {
23: }
24:
25: sub start_tex {
26: my ($target,$token,$parstack,$parser,$safeeval)=@_;
27: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
28: if ($target eq 'tex') {
29: return $bodytext
30: }
31: return '';
32: }
33:
34: sub end_tex {
35: }
36:
37: sub start_problem {
38: my ($target,$token,$parstack,$parser,$safeeval)=@_;
39:
40: #intialize globals
41: $Apache::inputtags::part='0';
42: @Apache::inputtags::responselist = ();
43:
44: #adeed vars to the scripting enviroment
45: my $expression='$external::part='.$Apache::inputtags::part.';';
46: &Apache::run::run($expression,$safeeval);
47: my $status;
48: my $datemsg;
49: if ($target eq 'web' || $target eq 'grade') {
50: ($status,$datemsg) = &Apache::lonhomework::check_date('0');
51: push (@Apache::inputtags::status,$status);
52: my $expression='$external::datestatus="'.$status.'";';
53: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.0.solved"}.'";';
54: &Apache::run::run($expression,$safeeval);
55: if ( $status eq 'CLOSED' ) {
56: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
57: if ( $target eq "web" ) {
58: return "<body bgcolor=\"#FFFFFF\"> <br />Problem is not open to be viewed. The problem $datemsg<br />";
59: }
60: }
61: }
62: if ($target eq 'web') {
63: my $args ='';
64: if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
65: my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
66: if ($name eq '') {
67: $name=&Apache::lonnet::EXT('resource.title');
68: if ($name eq 'con_lost') { $name = ''; }
69: }
70: $Apache::lonhomework::name=$name;
71: if ($status eq 'CAN_ANSWER') {
72: # create a page header and exit
73: return "<title>$name</title>\n<body bgcolor=\"#FFFFFF\">\n<form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".'<input type="hidden" name="submitted" value="yes" />';
74: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER' || $status eq 'CLOSED') {
75: return "<title>$name</title>\n<body bgcolor=\"#FFFFFF\">\n";
76: }
77: }
78: if ($target eq 'edit') {
79: return "<body bgcolor=\"#FFFFFF\">\n<form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">".'<input type="hidden" name="submitted" value="edit" />';
80: }
81: return '';
82: }
83:
84: sub end_problem {
85: my ($target,$token,$parstack,$parser,$safeeval)=@_;
86: my $result='';
87: my $status=$Apache::inputtags::status['-1'];
88: if ($target eq 'grade' || $target eq'web' ) {
89: if ( $target eq 'grade' && $Apache::inputtags::part eq '0' &&
90: $status eq 'CAN_ANSWER') {
91: # if part is zero, no <part>s existed, so we need to the grading
92: &Apache::inputtags::grade;
93: } elsif ($Apache::inputtags::part eq '0') {
94: # if part is zero, no <part>s existed, so we need show the current
95: # grading status
96: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
97: }
98: if ($target eq 'web') {
99: if ($status eq 'CAN_ANSWER') {
100: $result.="</form></body>\n";
101: } elsif ($status eq 'SHOW_ANSWER' || $status eq 'CANNOT_ANSWER') {
102: $result.="</body>\n";
103: }
104: }
105: }
106: if ($target eq 'meta') {
107: if ($Apache::inputtags::part eq '0') {
108:
109: $result=&Apache::response::mandatory_part_meta;
110: }
111: }
112: if ($target eq 'edit') {
113: &Apache::lonxml::debug("in end_problem with $target, edit");
114: $result='<br /><input type="submit" name="submit" value="Submit Changes" />';
115: }
116: return $result;
117: }
118:
119: sub start_block {
120: my ($target,$token,$parstack,$parser,$safeeval)=@_;
121:
122: my $code = @$parstack[$#$parstack];
123: $code =~ s/\"//g;
124: $code .=';return $condition;';
125: # print "<br />$code<br />";
126: my $result = &Apache::run::run($code,$safeeval);
127: &Apache::lonxml::debug("block :$code: returned :$result:");
128: if ( ! $result ) {
129: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
130: &Apache::lonxml::debug("skipping ahead :$skip: $$parser[$#$parser]");
131: }
132: return "";
133: }
134:
135: sub end_block {
136: }
137:
138: sub start_while {
139: my ($target,$token,$parstack,$parser,$safeeval)=@_;
140:
141: my $code = @$parstack[$#$parstack];
142: $code =~ s/\"//g;
143: $code .=';return $condition;';
144:
145: push( @Apache::structuretags::whileconds, $code);
146: my $result = &Apache::run::run($code,$safeeval);
147: my $bodytext=$$parser[$#$parser]->get_text("/while");
148: push( @Apache::structuretags::whilebody, $bodytext);
149: if ( $result ) {
150: &Apache::lonxml::newparser($parser,\$bodytext);
151: }
152: return "";
153: }
154:
155: sub end_while {
156: my ($target,$token,$parstack,$parser,$safeeval)=@_;
157: my $code = pop @Apache::structuretags::whileconds;
158: my $bodytext = pop @Apache::structuretags::whilebody;
159: my $result = &Apache::run::run($code,$safeeval);
160: if ( $result ) {
161: &Apache::lonxml::newparser($parser,\$bodytext);
162: }
163: return "";
164: }
165:
166: # <randomlist>
167: # <tag1>..</tag1>
168: # <tag2>..</tag2>
169: # <tag3>..</tag3>
170: # ...
171: # </randomlist>
172: sub start_randomlist {
173: my ($target,$token,$parstack,$parser,$safeeval)=@_;
174: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
175: my $b_parser= HTML::TokeParser->new(\$body);
176: my $b_tok;
177: my @randomlist;
178: my $list_item;
179:
180: while($b_tok = $b_parser->get_token() ) {
181: if($b_tok->[0] eq 'S') { # start tag
182: # get content of the tag until matching end tag
183: # get all text upto the matching tag
184: # and push the content into @randomlist
185: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
186: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
187: push(@randomlist,$list_item);
188: # print "<br /><b>START-TAG $b_tok->[1], $b_tok->[4], $list_item</b>";
189: }
190: if($b_tok->[0] eq 'T') { # text
191: # what to do with text in between tags?
192: # print "<b>TEXT $b_tok->[1]</b><br />";
193: }
194: # if($b_tok->[0] eq 'E') { # end tag, should not happen
195: # print "<b>END-TAG $b_tok->[1]</b><br />";
196: # }
197: }
198: my @idx_arr = (0 .. $#randomlist);
199: &Apache::structuretags::shuffle(\@idx_arr);
200: my $bodytext = '';
201: for(0 .. $#randomlist) {
202: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
203: }
204:
205: &Apache::lonxml::newparser($parser,\$bodytext);
206: return "";
207: }
208:
209: sub shuffle {
210: my $a=shift;
211: my $i;
212: for($i=@$a;--$i;) {
213: my $j=int rand($i+1);
214: next if $i == $j;
215: @$a[$i,$j] = @$a[$j,$i];
216: }
217: }
218:
219: sub end_randomlist {
220: }
221:
222: sub start_part {
223: my ($target,$token,$parstack,$parser,$safeeval)=@_;
224: my $args ='';
225: if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
226: my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
227: $Apache::inputtags::part=$id;
228: @Apache::inputtags::responselist = ();
229: if ($target eq 'meta') {
230: return &Apache::response::mandatory_part_meta;
231: } else {
232: my ($status,$datemsg) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
233: push (@Apache::inputtags::status,$status);
234: my $expression='$external::datestatus="'.$status.'";';
235: $expression.='$external::gradestatus="'.$Apache::lonhomework::history{"resource.$id.solved"}.'";';
236: &Apache::run::run($expression,$safeeval);
237: if ( $status eq 'CLOSED' ) {
238: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
239: if ( $target eq "web" ) {
240: return "<br />Part is not open to be viewed. It $datemsg<br />";
241: }
242: }
243: }
244: return '';
245: }
246:
247: sub end_part {
248: my ($target,$token,$parstack,$parser,$safeeval)=@_;
249: &Apache::lonxml::debug("in end_part $target ");
250: my $status=$Apache::inputtags::status['-1'];
251: pop @Apache::inputtags::status;
252: if ( $target eq 'meta' ) { return ''; }
253: if ( $target eq 'grade' && $status eq 'CAN_ANSWER') {
254: return &Apache::inputtags::grade;
255: }
256: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
257: }
258:
259: sub start_preduedate {
260: my ($target,$token,$parstack,$parser,$safeeval)=@_;
261: if ($target eq 'web' || $target eq 'grade') {
262: if ($Apache::inputtags::status['-1'] ne 'CAN_ANSWER' &&
263: $Apache::inputtags::status['-1'] ne 'CANNOT_ANSWER' ) {
264: &Apache::lonxml::get_all_text("/preduedate",$$parser[$#$parser]);
265: }
266: }
267: return '';
268: }
269:
270: sub end_preduedate {
271: return '';
272: }
273:
274: sub start_postanswerdate {
275: my ($target,$token,$parstack,$parser,$safeeval)=@_;
276: if ($target eq 'web' || $target eq 'grade') {
277: if ($Apache::inputtags::status['-1'] ne 'SHOW_ANSWER') {
278: &Apache::lonxml::get_all_text("/postanswerdate",$$parser[$#$parser]);
279: }
280: }
281: return '';
282: }
283:
284: sub end_postanswerdate {
285: return '';
286: }
287:
288: sub start_notsolved {
289: my ($target,$token,$parstack,$parser,$safeeval)=@_;
290: if ($target eq 'web' || $target eq 'grade') {
291: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
292: &Apache::lonxml::debug("not solved has :$gradestatus:");
293: if ($gradestatus =~ /^correct/) {
294: &Apache::lonxml::debug("skipping");
295: &Apache::lonxml::get_all_text("/notsolved",$$parser[$#$parser]);
296: }
297: }
298: return '';
299: }
300:
301: sub end_notsolved {
302: return '';
303: }
304:
305: sub start_solved {
306: my ($target,$token,$parstack,$parser,$safeeval)=@_;
307: if ($target eq 'web' || $target eq 'grade') {
308: my $gradestatus=$Apache::lonhomework::history{"resource.$Apache::inputtags::part.solved"};
309: if ($gradestatus !~ /^correct/) {
310: &Apache::lonxml::get_all_text("/solved",$$parser[$#$parser]);
311: }
312: }
313: return '';
314: }
315:
316: sub end_solved {
317: return '';
318: }
319:
320: sub start_startouttext {
321: my ($target,$token,$parstack,$parser,$safeeval)=@_;
322: my $result='';
323: if ($target eq "edit" ) { $result=" "; }
324: return $result;
325: }
326: sub end_startouttext {
327: my ($target,$token,$parstack,$parser,$safeeval)=@_;
328: my $result='';
329: if ($target eq 'edit') {
330: $result=&Apache::lonxml::get_all_text("endouttext",$$parser[$#$parser]);
331: $result=&Apache::edit::editfield($token->[1],$result);
332: }
333: return $result;
334: }
335: sub start_endouttext {
336: my ($target,$token,$parstack,$parser,$safeeval)=@_;
337: my $result='';
338: if ($target eq "edit" ) { $result=" "; }
339: return $result;
340: }
341: sub end_endouttext {
342: my ($target,$token,$parstack,$parser,$safeeval)=@_;
343: my $result='';
344: if ($target eq "edit" ) { $result=" "; }
345: return $result;
346: }
347:
348:
349: 1;
350: __END__
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