Code Modernization: Use null coalescing operator and improve readability of conditional in WP_Theme_JSON::get_styles_for_block().

Developed in WordPress#10902

Follow-up to [61607].

Props soean, westonruter, sergeybiryukov, mukesh27.
See #63430, #64263.


git-svn-id: https://develop.svn.wordpress.org/trunk@61621 602fd350-edb4-49c9-b593-d223f7449a82

Author: westonruter

src/wp-includes/class-wp-theme-json.php

@@ -2941,7 +2941,13 @@ static function ( $split_selector ) use ( $clean_style_variation_selector ) {
 				$style_variation_declarations[ $style_variation['selector'] ] = static::compute_style_properties( $style_variation_node, $settings, null, $this->theme_json );
 
 				// Process pseudo-selectors for this variation (e.g., :hover, :focus)
-				$block_name                    = isset( $block_metadata['name'] ) ? $block_metadata['name'] : ( in_array( 'blocks', $block_metadata['path'], true ) && count( $block_metadata['path'] ) >= 3 ? $block_metadata['path'][2] : null );
+				if ( isset( $block_metadata['name'] ) ) {
+					$block_name = $block_metadata['name'];
+				} elseif ( in_array( 'blocks', $block_metadata['path'], true ) && count( $block_metadata['path'] ) >= 3 ) {
+					$block_name = $block_metadata['path'][2];
+				} else {
+					$block_name = null;
+				}
 				$variation_pseudo_declarations = static::process_pseudo_selectors( $style_variation_node, $style_variation['selector'], $settings, $block_name );
 				$style_variation_declarations  = array_merge( $style_variation_declarations, $variation_pseudo_declarations );
 
@@ -3030,7 +3036,7 @@ static function ( $pseudo_selector ) use ( $selector ) {
 			// For block pseudo-selectors, we need to get the block data first, then access the pseudo-selector
 			$block_name  = $block_metadata['path'][2]; // 'core/button'
 			$block_data  = _wp_array_get( $this->theme_json, array( 'styles', 'blocks', $block_name ), array() );
-			$pseudo_data = isset( $block_data[ $block_pseudo_selector ] ) ? $block_data[ $block_pseudo_selector ] : array();
+			$pseudo_data = $block_data[ $block_pseudo_selector ] ?? array();
 
 			$declarations = static::compute_style_properties( $pseudo_data, $settings, null, $this->theme_json, $selector, $use_root_padding );
 		} else {