wp-includes/interactivity-api/class-wp-interactivity-api.php:1090Processes the data-wp-class directive.
$pWP_Interactivity_API_Directives_Processor$modestring private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) { if ( 'enter' === $mode ) { $all_class_directives = $p->get_attribute_names_with_prefix( 'data-wp-class--' ); $entries = $this->get_directive_entries( $p, 'class' ); foreach ( $entries as $entry ) { if ( empty( $entry['suffix'] ) ) { continue; } $class_name = isset( $entry['unique_id'] ) && $entry['unique_id'] ? "{$entry['suffix']}---{$entry['unique_id']}" : $entry['suffix']; if ( empty( $class_name ) ) { return; } $result = $this->evaluate( $entry ); if ( $result ) { $p->add_class( $class_name ); } else { $p->remove_class( $class_name ); } } } }Introduced in 6.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/interactivity-api/class-wp-interactivity-api.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.