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