IkiWiki/Plugin/htmlbalance.pm



#!/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 3.00;
use HTML::Entities;

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 q{use HTML::TreeBuilder};
    error $@ if $@;
    my $tree = HTML::TreeBuilder->new();
    $tree->ignore_unknown(0);
    $tree->ignore_ignorable_whitespace(0);
    $tree->no_space_compacting(1);
    $tree->p_strict(1);
    $tree->store_comments(0);
    $tree->store_declarations(0);
    $tree->store_pis(0);
    $tree->parse_content($params{content});
    my @nodes = $tree->disembowel();
    foreach my $node (@nodes) {
        if (ref $node) {
            $ret .= $node->as_XML();
            chomp $ret;
            $node->delete();
        }
        else {
            $ret .= encode_entities($node);
        }
    }
    $tree->delete();
    return $ret;
}

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