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#!/usr/bin/perl
use strict;
use warnings;
use HTML::Parser ();
use HTML::Entities qw(encode_entities);
sub disable_tags_but {
my ($text, $allowed_tags) = @_;
my @text;
my %allowed_tag = map { $_ => 1 } @{$allowed_tags || []};
my $tag_h = sub {
my ($tag, $text) = @_;
$text = encode_entities($text, "<") unless $allowed_tag{$tag};
push(@text, $text);
};
HTML::Parser->new(
start_h => [$tag_h, 'tagname, text'],
end_h => [$tag_h, 'tagname, text'],
default_h => [\@text, '@{text}'],
)->parse($text)->eof;
return join("", @text);
}
#
# Test it
#
print disable_tags_but(<<EOT, [qw(a br)]) unless caller;
Test
<foo> <a href="...">...</a>
</bar>
EOT