1: # The LearningOnline Network with CAPA # <script> definiton
2:
3: package Apache::structuretags;
4:
5: use strict;
6: use Apache::lonnet;
7:
8: sub BEGIN {
9: &Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem','web','tex','part'));
10: }
11:
12: sub start_web {
13: my ($target,$token,$parstack,$parser,$safeeval)=@_;
14: my $bodytext=&Apache::lonxml::get_all_text("/web",$$parser[$#$parser]);
15: if ($target eq 'web') {
16: return $bodytext;
17: }
18: return '';
19: }
20:
21: sub end_web {
22: }
23:
24: sub start_tex {
25: my ($target,$token,$parstack,$parser,$safeeval)=@_;
26: my $bodytext=&Apache::lonxml::get_all_text("/tex",$$parser[$#$parser]);
27: if ($target eq 'tex') {
28: return $bodytext
29: }
30: return '';
31: }
32:
33: sub end_tex {
34: }
35:
36: sub start_problem {
37: my ($target,$token,$parstack,$parser,$safeeval)=@_;
38:
39: #intialize globals
40: $Apache::inputtags::part='0';
41: @Apache::inputtags::responselist = ();
42:
43: #adeed vars to the scripting enviroment
44: my $expression='$external::part='.$Apache::inputtags::part.';';
45: &Apache::run::run($expression,$safeeval);
46: my $status;
47: my $datemsg;
48: if ($target ne 'meta') {
49: ($status,$datemsg) = &Apache::lonhomework::check_date('0');
50: push (@Apache::inputtags::status,$status);
51: if ( $status eq 'CLOSED' ) {
52: my $bodytext=&Apache::lonxml::get_all_text("/problem",$$parser[$#$parser]);
53: if ( $target eq "web" ) {
54: return "Problem is not open to be viewed. The problem $datemsg";
55: }
56: }
57: }
58: if ($target eq 'web') {
59: my $args ='';
60: if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
61: my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
62: if ($status eq 'CAN_ANSWER') {
63: # create a page header and exit
64: return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n<form name=\"lonhomework\" method=\"POST\" action=\"".$ENV{'request.uri'}."\">";
65: } elsif ($status eq 'SHOW_ANSWER') {
66: return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n";
67: }
68: }
69: return '';
70: }
71:
72: sub end_problem {
73: my ($target,$token,$parstack,$parser,$safeeval)=@_;
74: my $result='';
75: my $status=@Apache::inputtags::status['-1'];
76: unless ($target eq 'meta') {
77: if ( $target eq 'grade' && $Apache::inputtags::part eq '0') {
78: # if part is zero, no <part>s existed, so we need to the grading
79: &Apache::inputtags::grade;
80: } elsif ($Apache::inputtags::part eq '0') {
81: # if part is zero, no <part>s existed, so we need show the current
82: # grading status
83: $result.= &Apache::inputtags::gradestatus($Apache::inputtags::part);
84: }
85: if ($target eq 'web') {
86: if ($status eq 'CAN_ANSWER') {
87: $result.="</form></body>\n";
88: } elsif ($status eq 'SHOW_ANSWER') {
89: $result.="</body>\n";
90: }
91: }
92: } else {
93: if ($Apache::inputtags::part eq '0') {
94: $result=&Apache::response::mandatory_part_meta;
95: }
96: }
97: return $result;
98: }
99:
100: sub start_block {
101: my ($target,$token,$parstack,$parser,$safeeval)=@_;
102:
103: my $code = @$parstack[$#$parstack];
104: $code =~ s/\"//g;
105: $code .=';return $condition;';
106: # print "<br>$code<br>";
107: my $result = &Apache::run::run($code,$safeeval);
108: if ( ! $result ) {
109: # my $skip=$$parser[$#$parser]->get_text("/block");
110: my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
111: # print "skipped $skip";
112: }
113: return "";
114: }
115:
116: sub end_block {
117: }
118:
119: sub start_while {
120: my ($target,$token,$parstack,$parser,$safeeval)=@_;
121:
122: my $code = @$parstack[$#$parstack];
123: $code =~ s/\"//g;
124: $code .=';return $condition;';
125:
126: push( @Apache::structuretags::whileconds, $code);
127: my $result = &Apache::run::run($code,$safeeval);
128: my $bodytext=$$parser[$#$parser]->get_text("/while");
129: push( @Apache::structuretags::whilebody, $bodytext);
130: if ( $result ) {
131: &Apache::lonxml::newparser($parser,\$bodytext);
132: }
133: return "";
134: }
135:
136: sub end_while {
137: my ($target,$token,$parstack,$parser,$safeeval)=@_;
138: my $code = pop @Apache::structuretags::whileconds;
139: my $bodytext = pop @Apache::structuretags::whilebody;
140: my $result = &Apache::run::run($code,$safeeval);
141: if ( $result ) {
142: &Apache::lonxml::newparser($parser,\$bodytext);
143: }
144: return "";
145: }
146:
147: # <randomlist>
148: # <tag1>..</tag1>
149: # <tag2>..</tag2>
150: # <tag3>..</tag3>
151: # ...
152: # </randomlist>
153: sub start_randomlist {
154: my ($target,$token,$parstack,$parser,$safeeval)=@_;
155: my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
156: my $b_parser= HTML::TokeParser->new(\$body);
157: my $b_tok;
158: my @randomlist;
159: my $list_item;
160:
161: while($b_tok = $b_parser->get_token() ) {
162: if($b_tok->[0] eq 'S') { # start tag
163: # get content of the tag until matching end tag
164: # get all text upto the matching tag
165: # and push the content into @randomlist
166: $list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
167: $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
168: push(@randomlist,$list_item);
169: # print "<BR><B>START-TAG $b_tok->[1], $b_tok->[4], $list_item</B>";
170: }
171: if($b_tok->[0] eq 'T') { # text
172: # what to do with text in between tags?
173: # print "<B>TEXT $b_tok->[1]</B><BR>";
174: }
175: # if($b_tok->[0] eq 'E') { # end tag, should not happen
176: # print "<B>END-TAG $b_tok->[1]</B><BR>";
177: # }
178: }
179: my @idx_arr = (0 .. $#randomlist);
180: &Apache::structuretags::shuffle(\@idx_arr);
181: my $bodytext = '';
182: for(0 .. $#randomlist) {
183: $bodytext .= "$randomlist[ $idx_arr[$_] ]";
184: }
185:
186: &Apache::lonxml::newparser($parser,\$bodytext);
187: return "";
188: }
189:
190: sub shuffle {
191: my $a=shift;
192: my $i;
193: for($i=@$a;--$i;) {
194: my $j=int rand($i+1);
195: next if $i == $j;
196: @$a[$i,$j] = @$a[$j,$i];
197: }
198: }
199:
200: sub end_randomlist {
201: }
202:
203: sub start_part {
204: my ($target,$token,$parstack,$parser,$safeeval)=@_;
205: my $args ='';
206: if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
207: my $id = &Apache::run::run("{$args;".'return $id}',$safeeval);
208: $Apache::inputtags::part=$id;
209: @Apache::inputtags::responselist = ();
210: if ($target eq 'meta') {
211: return &Apache::response::mandatory_part_meta;
212: } else {
213: my ($date,$passed) = &Apache::lonhomework::check_date("OPEN_DATE",$id);
214: if ( !$passed ) {
215: my $bodytext=&Apache::lonxml::get_all_text("/part",$$parser[$#$parser]);
216: if ( $target eq "web" ) {
217: return "Part is not open to be viewed. It opens on $date";
218: }
219: }
220: }
221: return '';
222: }
223:
224: sub end_part {
225: my ($target,$token,$parstack,$parser,$safeeval)=@_;
226: &Apache::lonxml::debug("in end_part $target ");
227: if ( $target eq 'meta' ) { return ''; }
228: if ( $target eq 'grade' ) { return &Apaceh::inputtags::grade; }
229: return &Apache::inputtags::gradestatus($Apache::inputtags::part);
230: }
231:
232: 1;
233: __END__
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