WP_Theme_JSON::get_styles_for_block( array $block_metadata ): string

Compatibility

Present in every tracked release (6.7.10 to 7.1.3), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$block_metadataarray

Metadata about the block to get styles for.

Return value

string

Styles for the block.

Performance profile

How much work a call to WP_Theme_JSON::get_styles_for_block() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Trivial

Touches nothing outside its own arguments.

Scaling

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

11

Executed per call on PHP 8.5. The body compiles to 322.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

What one call costs · 1 distinct outcome

One number would be a lie: the work depends on which branch runs. These are every distinct cost WP_Theme_JSON::get_styles_for_block() can have, taken from its control-flow graph on PHP 8.5.

Uses · 7

• _wp_array_get()Accesses an array in depth based on a path of keys.
• static::get_feature_declarations_for_node()
• static::compute_style_properties()
• WP_Theme_JSON::process_blocks_custom_css()Processes the CSS, to apply nesting.
• static::to_ruleset()
• static::update_separator_declarations()
• WP_Theme_JSON::get_layout_styles()Gets the CSS layout rules for a particular block from theme.json layout definitions.

Source code

View on Trac ↗View on GitHub ↗

2833	public function get_styles_for_block( $block_metadata ) {2834		$node                 = _wp_array_get( $this->theme_json, $block_metadata['path'], array() );2835		$use_root_padding     = isset( $this->theme_json['settings']['useRootPaddingAwareAlignments'] ) && true === $this->theme_json['settings']['useRootPaddingAwareAlignments'];2836		$selector             = $block_metadata['selector'];2837		$settings             = isset( $this->theme_json['settings'] ) ? $this->theme_json['settings'] : array();2838		$feature_declarations = static::get_feature_declarations_for_node( $block_metadata, $node );2839		$is_root_selector     = static::ROOT_BLOCK_SELECTOR === $selector;2840 2841		// If there are style variations, generate the declarations for them, including any feature selectors the block may have.2842		$style_variation_declarations = array();2843		$style_variation_custom_css   = array();2844		if ( ! empty( $block_metadata['variations'] ) ) {2845			foreach ( $block_metadata['variations'] as $style_variation ) {2846				$style_variation_node           = _wp_array_get( $this->theme_json, $style_variation['path'], array() );2847				$clean_style_variation_selector = trim( $style_variation['selector'] );2848 2849				// Generate any feature/subfeature style declarations for the current style variation.2850				$variation_declarations = static::get_feature_declarations_for_node( $block_metadata, $style_variation_node );2851 2852				// Combine selectors with style variation's selector and add to overall style variation declarations.2853				foreach ( $variation_declarations as $current_selector => $new_declarations ) {2854					/*2855					 * Clean up any whitespace between comma separated selectors.2856					 * This prevents these spaces breaking compound selectors such as:2857					 * - `.wp-block-list:not(.wp-block-list .wp-block-list)`2858					 * - `.wp-block-image img, .wp-block-image.my-class img`2859					 */2860					$clean_current_selector = preg_replace( '/,\s+/', ',', $current_selector );2861					$shortened_selector     = str_replace( $block_metadata['selector'], '', $clean_current_selector );2862 2863					// Prepend the variation selector to the current selector.2864					$split_selectors    = explode( ',', $shortened_selector );2865					$updated_selectors  = array_map(2866						static function ( $split_selector ) use ( $clean_style_variation_selector ) {2867							return $clean_style_variation_selector . $split_selector;2868						},2869						$split_selectors2870					);2871					$combined_selectors = implode( ',', $updated_selectors );2872 2873					// Add the new declarations to the overall results under the modified selector.2874					$style_variation_declarations[ $combined_selectors ] = $new_declarations;2875				}2876 2877				// Compute declarations for remaining styles not covered by feature level selectors.2878				$style_variation_declarations[ $style_variation['selector'] ] = static::compute_style_properties( $style_variation_node, $settings, null, $this->theme_json );2879				// Store custom CSS for the style variation.2880				if ( isset( $style_variation_node['css'] ) ) {2881					$style_variation_custom_css[ $style_variation['selector'] ] = $this->process_blocks_custom_css( $style_variation_node['css'], $style_variation['selector'] );2882				}2883			}2884		}2885		/*2886		 * Get a reference to element name from path.2887		 * $block_metadata['path'] = array( 'styles','elements','link' );2888		 * Make sure that $block_metadata['path'] describes an element node, like [ 'styles', 'element', 'link' ].2889		 * Skip non-element paths like just ['styles'].2890		 */2891		$is_processing_element = in_array( 'elements', $block_metadata['path'], true );2892 2893		$current_element = $is_processing_element ? $block_metadata['path'][ count( $block_metadata['path'] ) - 1 ] : null;2894 2895		$element_pseudo_allowed = array();2896 2897		if ( isset( static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ] ) ) {2898			$element_pseudo_allowed = static::VALID_ELEMENT_PSEUDO_SELECTORS[ $current_element ];2899		}2900 2901		/*2902		 * Check for allowed pseudo classes (e.g. ":hover") from the $selector ("a:hover").2903		 * This also resets the array keys.2904		 */2905		$pseudo_matches = array_values(2906			array_filter(2907				$element_pseudo_allowed,2908				static function ( $pseudo_selector ) use ( $selector ) {2909					/*2910					 * Check if the pseudo selector is in the current selector,2911					 * ensuring it is not followed by a dash (e.g., :focus should not match :focus-visible).2912					 */

Changelog

Introduced in 6.1.0. Unchanged from 6.7.10 through 7.1.3.

1. 6.7.10
2. 6.8.11
3. 6.9.10
4. 7.0.7
5. 7.1.3

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 6.8.11 tag, from src/wp-includes/class-wp-theme-json.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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