htmlbalance: new plugin that balances tags by parsing and re-serializing

1 files changed, 57 insertions, 0 deletions

diff --git a/IkiWiki/Plugin/htmlbalance.pm b/IkiWiki/Plugin/htmlbalance.pm
new file mode 100644
index 000000000..667d73b6c
--- /dev/null
+++ b/IkiWiki/Plugin/htmlbalance.pm
@@ -0,0 +1,57 @@
+#!/usr/bin/perl
+package IkiWiki::Plugin::htmlbalance;
+
+# htmlbalance: Parse and re-serialize HTML to ensure balanced tags
+#
+# Copyright 2008 Simon McVittie <http://smcv.pseudorandom.co.uk/>
+# Licensed under the GNU GPL, version 2, or any later version published by the
+# Free Software Foundation
+
+use warnings;
+use strict;
+use IkiWiki 2.00;
+
+sub import { #{{{
+	hook(type => "getsetup", id => "htmlbalance", call => \&getsetup);
+	hook(type => "sanitize", id => "htmlbalance", call => \&sanitize);
+} # }}}
+
+sub getsetup () { #{{{
+	return
+		plugin => {
+			safe => 1,
+			rebuild => undef,
+		},
+} #}}}
+
+sub sanitize (@) { #{{{
+	my %params=@_;
+	my $ret = '';
+
+	eval {
+		use HTML::TreeBuilder;
+		use XML::Atom::Util qw(encode_xml);
+	};
+
+	if ($@) {
+		error($@);
+		return $params{content};
+	}
+
+	my $tree = HTML::TreeBuilder->new_from_content($params{content});
+	my @nodes = $tree->disembowel();
+	foreach my $node (@nodes) {
+		if (ref $node) {
+			$ret .= $node->as_XML();
+			chomp $ret;
+			$node->delete();
+		}
+		else {
+			$ret .= encode_xml($node);
+		}
+	}
+	$tree->delete();
+	return $ret;
+} # }}}
+
+1