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package HTML::WikiConverter::MoinMoin;

use warnings;
use strict;

use base 'HTML::WikiConverter';
our $VERSION = '0.54';

use Params::Validate ':types';
use URI;

=head1 NAME

HTML::WikiConverter::MoinMoin - Convert HTML to MoinMoin markup

=head1 SYNOPSIS

  use HTML::WikiConverter;
  my $wc = new HTML::WikiConverter( dialect => 'MoinMoin' );
  print $wc->html2wiki( $html );

=head1 DESCRIPTION

This module contains rules for converting HTML into MoinMoin
markup. See L<HTML::WikiConverter> for additional usage details.

=cut

sub rules {
  my %rules = (
    p   => { block => 1, trim => 'both', line_format => 'multi' },
    pre => { block => 1, start => "{{{\n", end => "\n}}}" },

    i      => { start => "''", end => "''", line_format => 'single' },
    em     => { alias => 'i' },
    b      => { start => "'''", end => "'''", line_format => 'single' },
    strong => { alias => 'b' },
    u      => { start => '__', end => '__', line_format => 'single' },

    sup   => { start => '^', end => '^', line_format => 'single' },
    sub   => { start => ',,', end => ',,', line_format => 'single' },
    code  => { start => '`', end => '`', line_format => 'single' },
    tt    => { alias => 'code' },
    small => { start => '~-', end => '-~', line_format => 'single' },
    big   => { start => '~+', end => '+~', line_format => 'single' },

    a => { replace => \&_link },
    img => { replace => \&_image },

    ul => { line_format => 'multi', block => 1, line_prefix => '  ' },
    ol => { alias => 'ul' },

    li => { start => \&_li_start, trim => 'leading' },

    dl => { line_format => 'multi' },
    dt => { trim => 'both', end => ':: ' },
    dd => { trim => 'both' },

    hr => { replace => "\n----\n" },
    br => { replace => '[[BR]]' },

    table => { block => 1, line_format => 'multi' },
    tr => { end => "||\n", line_format => 'single' },
    td => { start => \&_td_start, end => ' ', trim => 'both' },
    th => { alias => 'td' },

    # (bug #40114) http://moinmo.in/HelpOnHeadlines
    h1 => { start => '= ',      end => ' =',      block => 1, trim => 'both', line_format => 'single' },
    h2 => { start => '== ',     end => ' ==',     block => 1, trim => 'both', line_format => 'single' },
    h3 => { start => '=== ',    end => ' ===',    block => 1, trim => 'both', line_format => 'single' },
    h4 => { start => '==== ',   end => ' ====',   block => 1, trim => 'both', line_format => 'single' },
    h5 => { start => '===== ',  end => ' =====',  block => 1, trim => 'both', line_format => 'single' },
    h6 => { start => '====== ', end => ' ======', block => 1, trim => 'both', line_format => 'single' },
  );

  return \%rules;
}

=head1 ATTRIBUTES

In addition to the regular set of attributes recognized by the
L<HTML::WikiConverter> constructor, this dialect also accepts the
following attributes that can be passed into the C<new()>
constructor. See L<HTML::WikiConverter/ATTRIBUTES> for usage details.

=head2 enable_anchor_macro

Possible values: C<0>, C<1>. Enables C<[[Anchor(s)]]> formatting. See
L<http://moinmoin.wikiwikiweb.de/HelpOnMacros> for details.

=cut

sub attributes { {
  enable_anchor_macro => { default => 0, type => BOOLEAN }
} }

my %att2prop = (
  width => 'width',
  bgcolor => 'background-color',
);

sub _td_start {
  my( $self, $td, $rules ) = @_;

  my $prefix = '||';

  my @style = ( );

  push @style, '|'.$td->attr('rowspan') if $td->attr('rowspan');
  push @style, '-'.$td->attr('colspan') if $td->attr('colspan');

  # If we're the first td in the table, then include table settings
  if( ! $td->parent->left && ! $td->left ) {
    my $table = $td->look_up( _tag => 'table' );
    my $attstr = _attrs2style( $table, qw/ width bgcolor / );
    push @style, "tablestyle=\"$attstr\"" if $attstr;
  }

  # If we're the first td in this tr, then include tr settings
  if( ! $td->left ) {
    my $attstr = $td->parent->attr('style');
    push @style, "rowstyle=\"$attstr\"" if $attstr;
  }

  # Include td settings
  my $attstr = join ' ', map { "$_=\"".$td->attr($_)."\"" } grep $td->attr($_), qw/ id class style /;
  push @style, $attstr if $attstr;

  my $opts = @style ? '<'.join(' ',@style).'>' : '';

  return $prefix.$opts.' ';
}

sub _attrs2style {
  my( $node, @attrs ) = @_;
  return unless $node;
  my %attrs = map { $_ => $node->attr($_) } grep $node->attr($_), @attrs;
  my $attstr = join '; ', map "$att2prop{$_}:$attrs{$_}", sort keys %attrs;
  return $attstr || '';
}

sub _li_start {
  my( $self, $node, $rules ) = @_;
  my $bullet = '';
  $bullet = '*'  if $node->parent->tag eq 'ul';
  $bullet = '1.' if $node->parent->tag eq 'ol';
  return "\n$bullet ";
}

sub _link {
  my( $self, $node, $rules ) = @_;

  # bug #17813 requests anchors; MoinMoin:HelpOnMacros gives new
  # "<<Anchor(name)>>" syntax for anchors and other macros (this was
  # previously "[[Anchor(name)]]" sometime prior to 2008-10-01)

  # bug #29347 requests 'id' be favored over 'name'
  my $anchor_name = $node->attr('id') || $node->attr('name');
  return sprintf( "<<Anchor(%s)>>\n", $anchor_name ) if $self->enable_anchor_macro and $anchor_name;

  my $url = $node->attr('href') || '';
  my $text = $self->get_elem_contents($node) || '';

  # bug #17813
  if( $self->_abs2rel($url) =~ /^#/ ) {
    $url = $self->_abs2rel($url);
  }

  return $url if $url eq $text;
  return "[[$url|$text]]";
}

sub _abs2rel {
  my( $self, $uri ) = @_;
  return $uri unless $self->base_uri;
  return URI->new($uri)->rel($self->base_uri)->as_string;
}

sub _image {
  my( $self, $node, $rules ) = @_;
  return $node->attr('src') || '';
}

sub preprocess_node {
  my( $self, $node ) = @_;
  my $tag = $node->tag || '';

  $self->caption2para($node) if $tag eq 'caption';

  # Find something like <a id="some anchor here" name="or here">and content here</a>
  if( $node->tag eq 'a' and ( $node->attr('name') or $node->attr('id') ) and !$node->attr('href') and $self->get_elem_contents($node) ) {
    my $anchor_name = $node->attr('id') || $node->attr('name');
    $node->preinsert( new HTML::Element('a', name => $anchor_name) );
    $node->replace_with_content->delete();
   }
}

my @protocols = qw( http https mailto );
my $urls   = '(' . join('|', @protocols) . ')';
my $ltrs   = '\w';
my $gunk   = '\/\#\~\:\.\?\+\=\&\%\@\!\-';
my $punc   = '\.\:\?\-\{\(\)\}';
my $any    = "${ltrs}${gunk}${punc}";
my $url_re = "\\b($urls:\[$any\]+?)(?=\[$punc\]*\[^$any\])";

sub postprocess_output {
  my( $self, $outref ) = @_;
  $$outref =~ s/($url_re)\[\[BR\]\]/$1 [[BR]]/go;
}

=head1 AUTHOR

David J. Iberri, C<< <diberri at cpan.org> >>

=head1 BUGS

Please report any bugs or feature requests to
C<bug-html-wikiconverter-moinmoin at rt.cpan.org>, or through the web
interface at
L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=HTML-WikiConverter-MoinMoin>.
I will be notified, and then you'll automatically be notified of
progress on your bug as I make changes.

=head1 SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc HTML::WikiConverter::MoinMoin

You can also look for information at:

=over 4

=item * AnnoCPAN: Annotated CPAN documentation

L<http://annocpan.org/dist/HTML-WikiConverter-MoinMoin>

=item * CPAN Ratings

L<http://cpanratings.perl.org/d/HTML-WikiConverter-MoinMoin>

=item * RT: CPAN's request tracker

L<http://rt.cpan.org/NoAuth/Bugs.html?Dist=HTML-WikiConverter-MoinMoin>

=item * Search CPAN

L<http://search.cpan.org/dist/HTML-WikiConverter-MoinMoin>

=back

=head1 COPYRIGHT & LICENSE

Copyright (c) David J. Iberri, all rights reserved.

This program is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

=cut

1;