It is one way to write a flip_flop, like in this snippet which uses a xor flip flop to alternate row colours in a 'pretty' HTML table...
sub pretty_table {
my ($ary, $width, $no_center) = @_;
my $header = shift @$ary;
$width = $width ? qq!width="$width"! : '';
my $html = qq!<table border="0" cellpadding="2" cellspacing="1" $w
+idth>\n!;
my $cols = scalar @$header;
$html .= get_row( $header, $cols, 'header' );
my $flip_flop = 1;
for my $row_ref ( @$ary ) {
my $class = $flip_flop ? 'light' : 'dark';
$html .= get_row( $row_ref, $cols, $class );
$flip_flop ^= 1;
}
$html .= qq! <tr>\n <td colspan="$cols" class="header">
+</td>\n </tr>\n!;
$html .= "</table>\n";
$html = qq!<div align="center">\n<center>\n$html\n</center>\n</div
+>! unless $no_center;
return $html
}
sub get_row {
my ( $row_ref, $cols, $class ) = @_;
my $html = qq! <tr>\n!;
for my $td ( 0.. $cols-1 ) {
my $data = $row_ref->[$td] || ' ';
$html .= qq! <td class="$class">$data</td>\n!;
}
$html .= " </tr>\n";
return $html;
}
Of course you can get the same effect using $flip++ % 2 == 0 amongst others.
cheers
tachyon
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