sub _extract_images {
    my $self = shift;

    $self->{images} = [];

    if ( defined $self->{content} ) {
        my $parser = HTML::TokeParser->new(\$self->{content});
        while ( my $token = $parser->get_tag( keys %image_tags ) ) {
            my $image = $self->_image_from_token( $token, $parser );
            push( @{$self->{images}}, $image ) if $image;
        } # while
    }

    return;
}

sub _image_from_token {
    my $self = shift;
    my $token = shift;
    my $parser = shift;

    my $tag = $token->[0];
    my $attrs = $token->[1];

    if ( $tag eq 'input' ) {
        my $type = $attrs->{type} or return;
        return unless $type eq 'image';
    }

    require WWW::Mechanize::Image;
    return
        WWW::Mechanize::Image->new({
            tag     => $tag,
            base    => $self->base,
            url     => $attrs->{src},
            name    => $attrs->{name},
            height  => $attrs->{height},
            width   => $attrs->{width},
            alt     => $attrs->{alt},
            id      => $attrs->{id},
        });
}