wp-includes/global-styles-and-settings.php:516Determines the CSS selector for the block type and property provided, returning it if available.
$block_typeWP_Block_Type$targetstring|arrayoptional'root'$fallbackbooleanoptionalfalsestring|nullfunction wp_get_block_css_selector( $block_type, $target = 'root', $fallback = false ) { if ( empty( $target ) ) { return null; } $has_selectors = ! empty( $block_type->selectors ); // Root Selector. // Calculated before returning as it can be used as fallback for // feature selectors later on. $root_selector = null; if ( $has_selectors && isset( $block_type->selectors['root'] ) ) { // Use the selectors API if available. $root_selector = $block_type->selectors['root']; } elseif ( isset( $block_type->supports['__experimentalSelector'] ) && is_string( $block_type->supports['__experimentalSelector'] ) ) { // Use the old experimental selector supports property if set. $root_selector = $block_type->supports['__experimentalSelector']; } else { // If no root selector found, generate default block class selector. $block_name = str_replace( '/', '-', str_replace( 'core/', '', $block_type->name ) ); $root_selector = ".wp-block-{$block_name}"; } // Return selector if it's the root target we are looking for. if ( 'root' === $target ) { return $root_selector; } // If target is not `root` we have a feature or subfeature as the target. // If the target is a string convert to an array. if ( is_string( $target ) ) { $target = explode( '.', $target ); } // Feature Selectors ( May fallback to root selector ). if ( 1 === count( $target ) ) { $fallback_selector = $fallback ? $root_selector : null; // Prefer the selectors API if available. if ( $has_selectors ) { // Look for selector under `feature.root`. $path = array( current( $target ), 'root' ); $feature_selector = _wp_array_get( $block_type->selectors, $path, null ); if ( $feature_selector ) { return $feature_selector; } // Check if feature selector is set via shorthand. $feature_selector = _wp_array_get( $block_type->selectors, $target, null ); return is_string( $feature_selector ) ? $feature_selector : $fallback_selector; } // Try getting old experimental supports selector value. $path = array( current( $target ), '__experimentalSelector' ); $feature_selector = _wp_array_get( $block_type->supports, $path, null ); // Nothing to work with, provide fallback or null. if ( null === $feature_selector ) { return $fallback_selector; } // Scope the feature selector by the block's root selector. return WP_Theme_JSON::scope_selector( $root_selector, $feature_selector ); } // Subfeature selector // This may fallback either to parent feature or root selector. $subfeature_selector = null; // Use selectors API if available. if ( $has_selectors ) { $subfeature_selector = _wp_array_get( $block_type->selectors, $target, null ); } // Only return if we have a subfeature selector. if ( $subfeature_selector ) {Introduced in 6.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/global-styles-and-settings.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.