# The LearningOnline Network with CAPA # <script> definiton
package Apache::structuretags;
use strict;
use Apache::lonnet;
sub BEGIN {
&Apache::lonxml::register('Apache::structuretags',('block','while','randomlist','problem'));
}
sub start_problem {
my ($target,$token,$parstack,$parser,$safeeval)=@_;
my $args ='';
if ( $#$parstack > -1 ) {
$args=$$parstack[$#$parstack];
}
my $name = &Apache::run::run("{$args;".'return $name}',$safeeval);
return "<title>$name</title>\n<body bgcolor=#FFFFFF>\n"
}
sub end_problem {
return "</body>\n";
}
sub start_block {
my ($target,$token,$parstack,$parser,$safeeval)=@_;
my $code = @$parstack[$#$parstack];
$code =~ s/\"//g;
$code .=';return $condition;';
# print "<br>$code<br>";
my $result = &Apache::run::run($code,$safeeval);
if ( ! $result ) {
# my $skip=$$parser[$#$parser]->get_text("/block");
my $skip=&Apache::lonxml::get_all_text("/block",$$parser[$#$parser]);
# print "skipped $skip";
}
return "";
}
sub end_block {
}
sub start_while {
my ($target,$token,$parstack,$parser,$safeeval)=@_;
my $code = @$parstack[$#$parstack];
$code =~ s/\"//g;
$code .=';return $condition;';
push( @Apache::structuretags::whileconds, $code);
my $result = &Apache::run::run($code,$safeeval);
my $bodytext=$$parser[$#$parser]->get_text("/while");
push( @Apache::structuretags::whilebody, $bodytext);
if ( $result ) {
&Apache::lonxml::newparser($parser,\$bodytext);
}
return "";
}
sub end_while {
my ($target,$token,$parstack,$parser,$safeeval)=@_;
my $code = pop @Apache::structuretags::whileconds;
my $bodytext = pop @Apache::structuretags::whilebody;
my $result = &Apache::run::run($code,$safeeval);
if ( $result ) {
&Apache::lonxml::newparser($parser,\$bodytext);
}
return "";
}
# <randomlist>
# <tag1>..</tag1>
# <tag2>..</tag2>
# <tag3>..</tag3>
# ...
# </randomlist>
sub start_randomlist {
my ($target,$token,$parstack,$parser,$safeeval)=@_;
my $body= &Apache::lonxml::get_all_text("/randomlist",$$parser[$#$parser]);
my $b_parser= HTML::TokeParser->new(\$body);
my $b_tok;
my @randomlist;
my $list_item;
while($b_tok = $b_parser->get_token() ) {
if($b_tok->[0] eq 'S') { # start tag
# get content of the tag until matching end tag
# get all text upto the matching tag
# and push the content into @randomlist
$list_item = &Apache::lonxml::get_all_text('/'.$b_tok->[1],$b_parser);
$list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
push(@randomlist,$list_item);
# print "<BR><B>START-TAG $b_tok->[1], $b_tok->[4], $list_item</B>";
}
if($b_tok->[0] eq 'T') { # text
# what to do with text in between tags?
# print "<B>TEXT $b_tok->[1]</B><BR>";
}
# if($b_tok->[0] eq 'E') { # end tag, should not happen
# print "<B>END-TAG $b_tok->[1]</B><BR>";
# }
}
my @idx_arr = (0 .. $#randomlist);
&Apache::structuretags::shuffle(\@idx_arr);
my $bodytext = '';
for(0 .. $#randomlist) {
$bodytext .= "$randomlist[ $idx_arr[$_] ]";
}
&Apache::lonxml::newparser($parser,\$bodytext);
return "";
}
sub shuffle {
my $a=shift;
my $i;
for($i=@$a;--$i;) {
my $j=int rand($i+1);
next if $i == $j;
@$a[$i,$j] = @$a[$j,$i];
}
}
sub end_randomlist {
}
1;
__END__
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