Ein Plugin zum Erzeugen von HTML-Tags auf die Rails-Art.

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+package SL::Template::Plugin::L;
+
+use base qw( Template::Plugin );
+use Template::Plugin;
+
+use strict;
+
+sub new {
+  my $class   = shift;
+  my $context = shift;
+
+  return bless { }, $class;
+}
+
+sub attributes {
+  my $self    = shift;
+  my $options = shift || {};
+
+  my @result = ();
+  while (my ($name, $value) = each %{ $options }) {
+    next unless $name;
+    $value ||= '';
+    push @result, "${name}=\"" . $::locale->quote_special_chars('HTML', $value) . '"';
+  }
+
+  return @result ? ' ' . join(' ', @result) : '';
+}
+
+sub html_tag {
+  my $self       = shift;
+  my $tag        = shift;
+  my $content    = shift;
+  my $attributes = $self->attributes(shift || {});
+
+  return "<${tag}${attributes}/>" unless $content;
+  return "<${tag}${attributes}>${content}</${tag}>";
+}
+
+sub select_tag {
+  my $self              = shift;
+  my $name              = shift;
+  my $options_str       = shift;
+  my $attributes        = shift || {};
+
+  $attributes->{name}   = $name;
+  $attributes->{id}   ||= $name;
+
+  return $self->html_tag('select', $options_str, $attributes);
+}
+
+sub options_for_select {
+  my $self          = shift;
+  my $collection    = shift;
+  my $options       = shift || {};
+
+  my $value_key     = $options->{value} || 'id';
+  my $title_key     = $options->{title} || $value_key;
+
+  my @tags          = ();
+  if ($collection && (ref $collection eq 'ARRAY')) {
+    foreach my $element (@{ $collection }) {
+      my @result = !ref $element            ? ( $element,               $element               )
+                 :  ref $element eq 'ARRAY' ? ( $element->[0],          $element->[1]          )
+                 :  ref $element eq 'HASH'  ? ( $element->{$value_key}, $element->{$title_key} )
+                 :                            ( $element->$value_key,   $element->$title_key   );
+
+      my %attributes = ( value => $result[0] );
+      $attributes{selected} = 'selected' if $options->{default} && ($options->{default} eq ($result[0] || ''));
+
+      push @tags, $self->html_tag('option', $result[1], \%attributes);
+    }
+  }
+
+  return join('', @tags);
+}
+
+1;
+
+__END__
+
+=head1 NAME
+
+SL::Templates::Plugin::L -- Layouting / tag generation
+
+=head1 SYNOPSIS
+
+Usage from a template:
+
+  [% USE L %]
+
+  [% L.select_tag('direction', [ [ 'left', 'To the left' ], [ 'right', 'To the right' ] ]) %]
+
+  [% L.select_tag('direction', L.options_for_select([ { direction => 'left',  display => 'To the left'  },
+                                                      { direction => 'right', display => 'To the right' } ],
+                                                    value => 'direction', title => 'display', default => 'right')) %]
+
+=head1 DESCRIPTION
+
+A module modeled a bit after Rails' ActionView helpers. Several small
+functions that create HTML tags from various kinds of data sources.
+
+=head1 FUNCTIONS
+
+=over 4
+
+=item C<attributes \%items>
+
+Creates a string from all elements in C<\%items> suitable for usage as
+HTML tag attributes. Keys and values are HTML escaped even though keys
+must not contain non-ASCII characters for browsers to accept them.
+
+=item C<html_tag $tag_name, $content_string, \%attributes>
+
+Creates an opening and closing HTML tag for C<$tag_name> and puts
+C<$content_string> between the two. If C<$content_string> is undefined
+or empty then only a E<lt>tag/E<gt> tag will be created. Attributes
+are key/value pairs added to the opening tag.
+
+=item C<options_for_select \@collection, \%options>
+
+Creates a string suitable for a HTML 'select' tag consisting of one
+'E<lt>optionE<gt>' tag for each element in C<\@collection>. The value
+to use and the title to display are extracted from the elements in
+C<\@collection>. Each element can be one of four things:
+
+=over 12
+
+=item 1. An array reference with at least two elements. The first element is
+the value, the second element is its title.
+
+=item 2. A scalar. The scalar is both the value and the title.
+
+=item 3. A hash reference. In this case C<\%options> must contain
+I<value> and I<title> keys that name the keys in the element to use
+for the value and title respectively.
+
+=item 4. A blessed reference. In this case C<\%options> must contain
+I<value> and I<title> keys that name functions called on the blessed
+reference whose return values are used as the value and title
+respectively.
+
+=back
+
+For cases 3 and 4 C<$options{value}> defaults to C<id> and
+C<$options{title}> defaults to C<$options{value}>.
+
+=item C<select_tag $name, $options_string, \%attributes>
+
+Creates a HTML 'select' tag named $name with the contents
+$options_string and with arbitrary HTML attributes from
+C<\%attributes>. The tag's C<id> defaults to C<$name>.
+
+The $options_string is usually created by the C<options_for_select>
+function.
+
+=back
+
+=head1 MODULE AUTHORS
+
+Moritz Bunkus E<lt>m.bunkus@linet-services.deE<gt>
+
+L<http://linet-services.de>