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<?php
/**
 * Elements styles block support.
 *
 * @package WordPress
 * @since 5.8.0
 */

/**
 * Gets the elements class names.
 *
 * @since 6.0.0
 * @access private
 *
 * @return string The unique class name.
 */
function wp_get_elements_class_name(): string {
	return wp_unique_prefixed_id( 'wp-elements-' );
}

/**
 * Determines whether an elements class name should be added to the block.
 *
 * @since 6.6.0
 * @access private
 *
 * @param  array $block   Block object.
 * @param  array $options Per element type options e.g. whether to skip serialization.
 * @return bool Whether the block needs an elements class name.
 */
function wp_should_add_elements_class_name( $block, $options ) {
	if ( ! isset( $block['attrs']['style']['elements'] ) ) {
		return false;
	}

$element_color_properties = array(
		'button'  => array(
			'skip'  => $options['button']['skip'] ?? false,
			'paths' => array(
				array( 'button', 'color', 'text' ),
				array( 'button', 'color', 'background' ),
				array( 'button', 'color', 'gradient' ),
			),
		),
		'link'    => array(
			'skip'  => $options['link']['skip'] ?? false,
			'paths' => array(
				array( 'link', 'color', 'text' ),
				array( 'link', ':hover', 'color', 'text' ),
			),
		),
		'heading' => array(
			'skip'  => $options['heading']['skip'] ?? false,
			'paths' => array(
				array( 'heading', 'color', 'text' ),
				array( 'heading', 'color', 'background' ),
				array( 'heading', 'color', 'gradient' ),
				array( 'h1', 'color', 'text' ),
				array( 'h1', 'color', 'background' ),
				array( 'h1', 'color', 'gradient' ),
				array( 'h2', 'color', 'text' ),
				array( 'h2', 'color', 'background' ),
				array( 'h2', 'color', 'gradient' ),
				array( 'h3', 'color', 'text' ),
				array( 'h3', 'color', 'background' ),
				array( 'h3', 'color', 'gradient' ),
				array( 'h4', 'color', 'text' ),
				array( 'h4', 'color', 'background' ),
				array( 'h4', 'color', 'gradient' ),
				array( 'h5', 'color', 'text' ),
				array( 'h5', 'color', 'background' ),
				array( 'h5', 'color', 'gradient' ),
				array( 'h6', 'color', 'text' ),
				array( 'h6', 'color', 'background' ),
				array( 'h6', 'color', 'gradient' ),
			),
		),
	);

$elements_style_attributes = $block['attrs']['style']['elements'];

foreach ( $element_color_properties as $element_config ) {
		if ( $element_config['skip'] ) {
			continue;
		}

foreach ( $element_config['paths'] as $path ) {
			if ( null !== _wp_array_get( $elements_style_attributes, $path, null ) ) {
				return true;
			}
		}
	}

return false;
}

/**
 * Render the elements stylesheet and adds elements class name to block as required.
 *
 * In the case of nested blocks we want the parent element styles to be rendered before their descendants.
 * This solves the issue of an element (e.g.: link color) being styled in both the parent and a descendant:
 * we want the descendant style to take priority, and this is done by loading it after, in DOM order.
 *
 * @since 6.0.0
 * @since 6.1.0 Implemented the style engine to generate CSS and classnames.
 * @since 6.6.0 Element block support class and styles are generated via the `render_block_data` filter instead of `pre_render_block`.
 * @access private
 *
 * @param array $parsed_block The parsed block.
 * @return array The same parsed block with elements classname added if appropriate.
 *
 * @phpstan-param array{
 *     blockName: string,
 *     attrs: array{
 *         className?: string,
 *         style?: array{
 *             elements?: array<string, array{
 *                 ":hover"?: array<string, string>,
 *                 ...
 *             }>,
 *         },
 *         ...
 *     },
 *     ...
 * } $parsed_block
 * @phpstan-return array{
 *     blockName: string,
 *     attrs: array{
 *         className?: string,
 *         ...
 *     },
 *     ...
 * }
 */
function wp_render_elements_support_styles( $parsed_block ) {
	/*
	 * The generation of element styles and classname were moved to the
	 * `render_block_data` filter in 6.6.0 to avoid filtered attributes
	 * breaking the application of the elements CSS class.
	 *
	 * @link https://github.com/WordPress/gutenberg/pull/59535
	 *
	 * The change in filter means, the argument types for this function
	 * have changed and require deprecating.
	 */
	if ( is_string( $parsed_block ) ) {
		_deprecated_argument(
			__FUNCTION__,
			'6.6.0',
			__( 'Use as a `pre_render_block` filter is deprecated. Use with `render_block_data` instead.' )
		);
	}

$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $parsed_block['blockName'] );
	if ( ! $block_type ) {
		return $parsed_block;
	}

$element_block_styles = $parsed_block['attrs']['style']['elements'] ?? null;
	if ( ! $element_block_styles ) {
		return $parsed_block;
	}

$skip_link_color_serialization         = wp_should_skip_block_supports_serialization( $block_type, 'color', 'link' );
	$skip_heading_color_serialization      = wp_should_skip_block_supports_serialization( $block_type, 'color', 'heading' );
	$skip_button_color_serialization       = wp_should_skip_block_supports_serialization( $block_type, 'color', 'button' );
	$skips_all_element_color_serialization = $skip_link_color_serialization &&
		$skip_heading_color_serialization &&
		$skip_button_color_serialization;

if ( $skips_all_element_color_serialization ) {
		return $parsed_block;
	}

$options = array(
		'button'  => array( 'skip' => $skip_button_color_serialization ),
		'link'    => array( 'skip' => $skip_link_color_serialization ),
		'heading' => array( 'skip' => $skip_heading_color_serialization ),
	);

if ( ! wp_should_add_elements_class_name( $parsed_block, $options ) ) {
		return $parsed_block;
	}

$class_name         = wp_get_elements_class_name();
	$updated_class_name = isset( $parsed_block['attrs']['className'] ) ? $parsed_block['attrs']['className'] . " $class_name" : $class_name;

_wp_array_set( $parsed_block, array( 'attrs', 'className' ), $updated_class_name );

// Generate element styles based on selector and store in style engine for enqueuing.
	$element_types = array(
		'button'  => array(
			'selector' => ".$class_name .wp-element-button, .$class_name .wp-block-button__link",
			'skip'     => $skip_button_color_serialization,
		),
		'link'    => array(
			'selector'       => ".$class_name a:where(:not(.wp-element-button))",
			'hover_selector' => ".$class_name a:where(:not(.wp-element-button)):hover",
			'skip'           => $skip_link_color_serialization,
		),
		'heading' => array(
			'selector' => ".$class_name h1, .$class_name h2, .$class_name h3, .$class_name h4, .$class_name h5, .$class_name h6",
			'skip'     => $skip_heading_color_serialization,
			'elements' => array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ),
		),
	);

foreach ( $element_types as $element_type => $element_config ) {
		if ( $element_config['skip'] ) {
			continue;
		}

$element_style_object = $element_block_styles[ $element_type ] ?? null;

// Process primary element type styles.
		if ( $element_style_object ) {
			wp_style_engine_get_styles(
				$element_style_object,
				array(
					'selector' => $element_config['selector'],
					'context'  => 'block-supports',
				)
			);

if ( isset( $element_style_object[':hover'], $element_config['hover_selector'] ) ) {
				wp_style_engine_get_styles(
					$element_style_object[':hover'],
					array(
						'selector' => $element_config['hover_selector'],
						'context'  => 'block-supports',
					)
				);
			}
		}

// Process related elements e.g. h1-h6 for headings.
		if ( isset( $element_config['elements'] ) ) {
			foreach ( $element_config['elements'] as $element ) {
				$element_style_object = $element_block_styles[ $element ] ?? null;

if ( $element_style_object ) {
					wp_style_engine_get_styles(
						$element_style_object,
						array(
							'selector' => ".$class_name $element",
							'context'  => 'block-supports',
						)
					);
				}
			}
		}
	}

return $parsed_block;
}

/**
 * Ensure the elements block support class name generated, and added to
 * block attributes, in the `render_block_data` filter gets applied to the
 * block's markup.
 *
 * @see wp_render_elements_support_styles
 * @since 6.6.0
 *
 * @param string $block_content Rendered block content.
 * @param array  $block         Block object.
 * @return string               Filtered block content.
 *
 * @phpstan-param array{
 *     attrs: array{
 *         className?: string,
 *         ...
 *     },
 *     ...
 * } $block
 */
function wp_render_elements_class_name( $block_content, $block ) {
	$class_name_attr   = $block['attrs']['className'] ?? null;
	$class_name_prefix = 'wp-elements-';
	if ( ! is_string( $class_name_attr ) || ! str_contains( $class_name_attr, $class_name_prefix ) ) {
		return $block_content;
	}

// Parse out the 'wp-elements-*' class name.
	$matched_class_name = null;
	$token_delimiter    = " \t\f\r\n";
	$class_token        = strtok( $class_name_attr, $token_delimiter );
	while ( false !== $class_token ) {
		if ( str_starts_with( $class_token, $class_name_prefix ) ) {
			$matched_class_name = $class_token;
			break;
		}
		$class_token = strtok( $token_delimiter );
	}
	if ( null === $matched_class_name ) {
		return $block_content;
	}

$tags = new WP_HTML_Tag_Processor( $block_content );
	if ( $tags->next_tag() ) {
		$tags->add_class( $matched_class_name );
	}

return $tags->get_updated_html();
}

add_filter( 'render_block', 'wp_render_elements_class_name', 10, 2 );
add_filter( 'render_block_data', 'wp_render_elements_support_styles', 10, 1 );

Editing: elements.php

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