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#!/usr/bin/perl -w
use strict;
use HTML::Parser ();
HTML::Parser->new(start_h => [ \&start_lc, "tokenpos, text" ],
end_h => [ sub { print lc shift }, "text" ],
default_h => [ sub { print shift }, "text" ],
)
->parse_file(shift) || die "Can't open file: $!\n";
sub start_lc {
my($tpos, $text) = @_;
for (my $i = 0; $i < @$tpos; $i += 2) {
next if $i && ($i/2) % 2 == 0; # skip attribute values
$_ = lc $_ for substr($text, $tpos->[$i], $tpos->[$i+1]);
}
print $text;
}