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    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'));
   10: }
   11: 
   12: sub start_block {
   13:   my ($target,$token,$parstack,$parser,$safeeval)=@_;
   14: 
   15:   my $code = @$parstack[$#$parstack];
   16:   $code =~ s/\"//g;
   17:   $code .=';return $condition;';
   18: #  print "<br>$code<br>";
   19:   my $result = &Apache::run::run($code,$safeeval);
   20:   if ( ! $result ) { 
   21: #    my $skip=$$parser[$#$parser]->get_text("/block");
   22:     my $skip=&Apache::lonxml::get_all_text("block",$$parser[$#$parser]);
   23: #    print "skipped $skip";
   24:   }
   25:   return "";
   26: }
   27: 
   28: sub end_block {
   29: }
   30: 
   31: sub start_while {
   32:   my ($target,$token,$parstack,$parser,$safeeval)=@_;
   33: 
   34:   my $code = @$parstack[$#$parstack];
   35:   $code =~ s/\"//g;
   36:   $code .=';return $condition;';
   37: 
   38:   push( @Apache::structuretags::whileconds, $code); 
   39:   my $result = &Apache::run::run($code,$safeeval);
   40:   my $bodytext=$$parser[$#$parser]->get_text("/while");
   41:   push( @Apache::structuretags::whilebody, $bodytext);
   42:   if ( $result ) { 
   43:      my $tempparser=HTML::TokeParser->new(\$bodytext);
   44:      push (@$parser,$tempparser);
   45:   }
   46:   return "";
   47: }
   48: 
   49: sub end_while {
   50:   my ($target,$token,$parstack,$parser,$safeeval)=@_;
   51:   my $code = pop @Apache::structuretags::whileconds;
   52:   my $bodytext = pop @Apache::structuretags::whilebody;
   53:   my $result = &Apache::run::run($code,$safeeval);
   54:   if ( $result ) { 
   55:      my $tempparser=HTML::TokeParser->new(\$bodytext);
   56:      push (@$parser,$tempparser);
   57:   } 
   58:   return "";
   59: }
   60: 
   61: # <randomlist> 
   62: #  <tag1>..</tag1>
   63: #  <tag2>..</tag2>
   64: #  <tag3>..</tag3>
   65: #  ... 
   66: # </randomlist>
   67: sub start_randomlist {
   68:   my ($target,$token,$parstack,$parser,$safeeval)=@_;
   69:   my $body= &Apache::lonxml::get_all_text("randomlist",$$parser[$#$parser]);
   70:   my $b_parser= HTML::TokeParser->new(\$body);
   71:   my $b_tok;
   72:   my @randomlist;
   73:   my $list_item;
   74: 
   75:   while($b_tok = $b_parser->get_token() ) {
   76:     if($b_tok->[0] eq 'S') { # start tag
   77:     # get content of the tag until matching end tag
   78:     # get all text upto the matching tag
   79:     # and push the content into @randomlist
   80:       $list_item = &Apache::lonxml::get_all_text($b_tok->[1],$b_parser);
   81:       $list_item = "$b_tok->[4]"."$list_item"."</$b_tok->[1]>";
   82:       push(@randomlist,$list_item);
   83:    #  print "<BR><B>START-TAG $b_tok->[1], $b_tok->[4], $list_item</B>";
   84:     }
   85:     if($b_tok->[0] eq 'T') { # text
   86:     # what to do with text in between tags?
   87:       #  print "<B>TEXT $b_tok->[1]</B><BR>";
   88:     }
   89:     # if($b_tok->[0] eq 'E') { # end tag, should not happen
   90:       #  print "<B>END-TAG $b_tok->[1]</B><BR>";
   91:     # }
   92:   }
   93:   my @idx_arr = (0 .. $#randomlist);
   94:   &Apache::structuretags::shuffle(\@idx_arr);
   95:   my $bodytext = '';
   96:   for(0 .. $#randomlist) {
   97:     $bodytext .= "$randomlist[ $idx_arr[$_] ]";
   98:   }
   99:   my $tempparser=HTML::TokeParser->new(\$bodytext);
  100:   push (@$parser,$tempparser);
  101:   return "";
  102: }
  103: 
  104: sub shuffle {
  105:     my $a=shift;
  106:     my $i;
  107:     for($i=@$a;--$i;) {
  108:       my $j=int rand($i+1);
  109:       next if $i == $j;
  110:       @$a[$i,$j] = @$a[$j,$i];
  111:     }
  112: }
  113: 
  114: sub end_randomlist {
  115: }
  116: 
  117: 
  118: 1;
  119: __END__