public static function post_type( $condition = array() ) {
		global $post;

		$target = explode( '_', $condition['target'] );

		// Modifier should be the last key.
		$modifier = array_pop( $target );

		// Post type is the remaining keys combined.
		$post_type = implode( '_', $target );

		$selected = ! empty( $condition['settings']['selected'] ) ? $condition['settings']['selected'] : array();

		switch ( $modifier ) {
			case 'index':
				if ( is_post_type_archive( $post_type ) ) {
					return true;
				}
				break;

			case 'all':
				// Checks for valid post type, if $post_type is page, then include the front page as most users simply expect this.
				if ( self::is_post_type( $post_type ) || ( $post_type == 'page' && is_front_page() ) ) {
					return true;
				}
				break;

			case 'ID':
			case 'selected':
				if ( self::is_post_type( $post_type ) && is_singular( $post_type ) && in_array( $post->ID, wp_parse_id_list( $selected ) ) ) {
					return true;
				}
				break;

			case 'children':
				if ( ! is_post_type_hierarchical( $post_type ) || ! is_singular( $post_type ) ) {
					return false;
				}

				// Chosen parents.
				$selected = wp_parse_id_list( $selected );

				foreach ( $selected as $id ) {
					if ( $post->post_parent == $id ) {
						return true;
					}
				}
				break;

			case 'ancestors':
				if ( ! is_post_type_hierarchical( $post_type ) || ! is_singular( $post_type ) ) {
					return false;
				}

				// Ancestors of the current page.
				$ancestors = get_post_ancestors( $post->ID );

				// Chosen parent/grandparents.
				$selected = wp_parse_id_list( $selected );

				foreach ( $selected as $id ) {
					if ( in_array( $id, $ancestors ) ) {
						return true;
					}
				}
				break;

			case 'template':
				if ( is_page() && is_page_template( $selected ) ) {
					return true;
				}
				break;
		}

		return false;
	}