XML::Toolkit::Builder::Filter - An XML::SAX Filter that generates Moose Classes

    use XML::Toolkit::Builder::Filter;

    my $filter = XML::Toolkit::Builder::Filter->new( 
        template => $template, 
        namespace => $namespace 
    );

    my $parser = XML::SAX::ParserFactory->parser( Handler => $filter );

    $parser->parse_file($file);
    print $filter->render;

package XML::Toolkit::Builder::Filter;
use Moose;
use Moose::Util::TypeConstraints;
use aliased 'XML::Toolkit::MetaDescription::Trait' => 'XMLTrait';

use namespace::autoclean;

extends qw(XML::Filter::Moose);

with qw(
  XML::Toolkit::Builder::ClassRegistry
  XML::Toolkit::Builder::ClassTemplate
);

around create_class => sub {
    my ( $next, $self, $name, $params ) = @_;
    return $self->get_class($name) if $self->has_class($name);
    class_type $name; # we only need to generate the class type when we build a new class
    $self->$next( $name => %$params );
};

sub add_attribute {
    my ( $self, $class, $type, $attr ) = @_;
    my $name = $attr->{LocalName} . ( $type eq 'child' ? '_collection' : '' );
    return if $class->has_attribute($name);

    my $param = { map { $_ => $attr->{$_} } qw(isa is auto_deref) };
    $param->{isa} //= 'Str';
    $param->{is}          = 'bare';
    $param->{traits}      = [XMLTrait];
    $param->{default}     = $attr->{Value};
    $param->{description} = {
        node_type    => $type,
        Prefix       => $attr->{Prefix},
        NamespaceURI => $attr->{NamespaceURI},
        LocalName    => $attr->{LocalName},
        Name         => $attr->{Name},
    };
    $class->add_attribute( $name => $param )
      unless $class->has_attribute($name);
}

sub add_text_attribute {
    my ( $self, $class ) = @_;
    $class->add_attribute(
        'text' => (
            isa         => 'Str',
            is          => 'rw',
            traits      => [XMLTrait],
            description => {
                node_type => 'character',
                cdata     => $self->cdata,
            },
        )
    );
}

sub start_cdata {
    my ( $self, $el ) = @_;
    $self->cdata(1);
}

sub end_cdata {
    my ( $self, $el ) = @_;
#    $self->cdata(0);
}

sub start_element {
    my ( $self, $el ) = @_;

    my $classname = $self->get_class_name($el);

    $el->{classname} = $classname;

    my $class = $self->create_class( $classname => $el );
    $self->add_class( $classname => $class );
    $self->add_attribute( $class, 'attribute' => $_ )
      for values %{ $el->{Attributes} };

    unless ( $self->is_root ) {
        my $parent = $self->get_class( $self->parent_element->{classname} );
        $self->add_attribute(
            $parent, 'child',
            {
                %$el,
                isa        => "ArrayRef[$classname]",
                auto_deref => 1,
                lazy       => 1,
                default    => sub { [] },
            }
        );
    }

    # cribbed from XML::Filter::Moose
    $self->add_element($el);
}

sub end_element {
    my ( $self, $el ) = @_;

    my $top = $self->current_element;

    $self->add_text_attribute( $self->get_class( $top->{classname} ) )
      if $self->has_text;
    confess "INVALID PARSE: $el->{Name} ne $top->{Name}"
      unless $el->{Name} eq $top->{Name};

    # cribbed from XML::Filter::Moose
    $self->pop_element;
    $self->reset_text;

}

__PACKAGE__->meta->make_immutable;
1;    # Magic true value required at end of module
__END__