html-processor-get-css-selector.php

<?php

/**
 * Constructs a CSS selector for the current tag.
 *
 * @param WP_HTML_Processor $processor Processor.
 * @return string Selector.
 */
function get_css_selector( WP_HTML_Processor $processor ): string {
	$selector = join( ' > ', $processor->get_breadcrumbs() );
	$id       = $processor->get_attribute( 'id' );
	if ( is_string( $id ) ) {
		$selector .= '#' . $id;
	}
	$class_attr = $processor->get_attribute( 'class' );
	if ( is_string( $class_attr ) ) {
		$selector .= join(
			'',
			array_map(
				static function ( string $class_name ): string {
					return '.' . $class_name;
				},
				array_filter(
					(array) preg_split( '/\s+/', trim( $class_attr ) )
				)
			)
		);
	}
	return $selector;
}