<?php

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/**

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* Elements styles block support.

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*

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* @package WordPress

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* @since 5.8.0

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*/

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/**

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* Gets the elements class names.

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*

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* @since 6.0.0

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* @access private

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*

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* @param array $block Block object.

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* @return string The unique class name.

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*/

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function wp_get_elements_class_name( $block ) {

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return 'wp-elements-' . md5( serialize( $block ) );

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}

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/**

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* Determines whether an elements class name should be added to the block.

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*

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* @since 6.6.0

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* @access private

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*

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* @param array $block Block object.

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* @param array $options Per element type options e.g. whether to skip serialization.

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* @return boolean Whether the block needs an elements class name.

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*/

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function wp_should_add_elements_class_name( $block, $options ) {

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if ( ! isset( $block['attrs']['style']['elements'] ) ) {

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return false;

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}

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$element_color_properties = array(

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'button' => array(

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'skip' => isset( $options['button']['skip'] ) ? $options['button']['skip'] : false,

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'paths' => array(

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array( 'button', 'color', 'text' ),

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array( 'button', 'color', 'background' ),

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array( 'button', 'color', 'gradient' ),

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),

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),

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'link' => array(

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'skip' => isset( $options['link']['skip'] ) ? $options['link']['skip'] : false,

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'paths' => array(

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array( 'link', 'color', 'text' ),

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array( 'link', ':hover', 'color', 'text' ),

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),

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),

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'heading' => array(

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'skip' => isset( $options['heading']['skip'] ) ? $options['heading']['skip'] : false,

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'paths' => array(

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array( 'heading', 'color', 'text' ),

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array( 'heading', 'color', 'background' ),

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array( 'heading', 'color', 'gradient' ),

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array( 'h1', 'color', 'text' ),

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array( 'h1', 'color', 'background' ),

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array( 'h1', 'color', 'gradient' ),

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array( 'h2', 'color', 'text' ),

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array( 'h2', 'color', 'background' ),

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array( 'h2', 'color', 'gradient' ),

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array( 'h3', 'color', 'text' ),

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array( 'h3', 'color', 'background' ),

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array( 'h3', 'color', 'gradient' ),

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array( 'h4', 'color', 'text' ),

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array( 'h4', 'color', 'background' ),

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array( 'h4', 'color', 'gradient' ),

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array( 'h5', 'color', 'text' ),

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array( 'h5', 'color', 'background' ),

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array( 'h5', 'color', 'gradient' ),

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array( 'h6', 'color', 'text' ),

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array( 'h6', 'color', 'background' ),

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array( 'h6', 'color', 'gradient' ),

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),

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),

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);

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

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foreach ( $element_color_properties as $element_config ) {

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if ( $element_config['skip'] ) {

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continue;

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}

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foreach ( $element_config['paths'] as $path ) {

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if ( null !== _wp_array_get( $elements_style_attributes, $path, null ) ) {

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return true;

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}

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}

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}

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return false;

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}

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/**

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* Render the elements stylesheet and adds elements class name to block as required.

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*

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* In the case of nested blocks we want the parent element styles to be rendered before their descendants.

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* This solves the issue of an element (e.g.: link color) being styled in both the parent and a descendant:

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* we want the descendant style to take priority, and this is done by loading it after, in DOM order.

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*

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* @since 6.0.0

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* @since 6.1.0 Implemented the style engine to generate CSS and classnames.

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* @since 6.6.0 Element block support class and styles are generated via the `render_block_data` filter instead of `pre_render_block`.

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* @access private

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*

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* @param array $parsed_block The parsed block.

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* @return array The same parsed block with elements classname added if appropriate.

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*/

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function wp_render_elements_support_styles( $parsed_block ) {

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/*

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* The generation of element styles and classname were moved to the

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* `render_block_data` filter in 6.6.0 to avoid filtered attributes

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* breaking the application of the elements CSS class.

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*

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* @see https://github.com/WordPress/gutenberg/pull/59535

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*

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* The change in filter means, the argument types for this function

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* have changed and require deprecating.

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*/

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if ( is_string( $parsed_block ) ) {

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_deprecated_argument(

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__FUNCTION__,

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'6.6.0',

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__( 'Use as a `pre_render_block` filter is deprecated. Use with `render_block_data` instead.' )

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);

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}

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$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $parsed_block['blockName'] );

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$element_block_styles = isset( $parsed_block['attrs']['style']['elements'] ) ? $parsed_block['attrs']['style']['elements'] : null;

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if ( ! $element_block_styles ) {

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return $parsed_block;

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}

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$skip_link_color_serialization = wp_should_skip_block_supports_serialization( $block_type, 'color', 'link' );

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$skip_heading_color_serialization = wp_should_skip_block_supports_serialization( $block_type, 'color', 'heading' );

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$skip_button_color_serialization = wp_should_skip_block_supports_serialization( $block_type, 'color', 'button' );

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$skips_all_element_color_serialization = $skip_link_color_serialization &&

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$skip_heading_color_serialization &&

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$skip_button_color_serialization;

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if ( $skips_all_element_color_serialization ) {

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return $parsed_block;

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}

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$options = array(

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'button' => array( 'skip' => $skip_button_color_serialization ),

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'link' => array( 'skip' => $skip_link_color_serialization ),

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'heading' => array( 'skip' => $skip_heading_color_serialization ),

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);

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if ( ! wp_should_add_elements_class_name( $parsed_block, $options ) ) {

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return $parsed_block;

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}

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$class_name = wp_get_elements_class_name( $parsed_block );

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

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

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// Generate element styles based on selector and store in style engine for enqueuing.

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$element_types = array(

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'button' => array(

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'selector' => ".$class_name .wp-element-button, .$class_name .wp-block-button__link",

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'skip' => $skip_button_color_serialization,

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),

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'link' => array(

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'selector' => ".$class_name a:where(:not(.wp-element-button))",

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'hover_selector' => ".$class_name a:where(:not(.wp-element-button)):hover",

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'skip' => $skip_link_color_serialization,

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),

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'heading' => array(

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'selector' => ".$class_name h1, .$class_name h2, .$class_name h3, .$class_name h4, .$class_name h5, .$class_name h6",

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'skip' => $skip_heading_color_serialization,

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'elements' => array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ),

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),

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);

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foreach ( $element_types as $element_type => $element_config ) {

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if ( $element_config['skip'] ) {

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continue;

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}

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$element_style_object = isset( $element_block_styles[ $element_type ] ) ? $element_block_styles[ $element_type ] : null;

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// Process primary element type styles.

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if ( $element_style_object ) {

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wp_style_engine_get_styles(

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$element_style_object,

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array(

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'selector' => $element_config['selector'],

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'context' => 'block-supports',

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)

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);

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if ( isset( $element_style_object[':hover'] ) ) {

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wp_style_engine_get_styles(

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$element_style_object[':hover'],

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array(

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'selector' => $element_config['hover_selector'],

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'context' => 'block-supports',

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)

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);

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}

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}

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// Process related elements e.g. h1-h6 for headings.

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if ( isset( $element_config['elements'] ) ) {

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foreach ( $element_config['elements'] as $element ) {

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$element_style_object = isset( $element_block_styles[ $element ] )

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? $element_block_styles[ $element ]

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: null;

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if ( $element_style_object ) {

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wp_style_engine_get_styles(

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$element_style_object,

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array(

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'selector' => ".$class_name $element",

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'context' => 'block-supports',

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)

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);

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}

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}

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}

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}

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return $parsed_block;

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}

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/**

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* Ensure the elements block support class name generated, and added to

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* block attributes, in the `render_block_data` filter gets applied to the

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* block's markup.

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*

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* @see wp_render_elements_support_styles

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* @since 6.6.0

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*

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* @param string $block_content Rendered block content.

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* @param array $block Block object.

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* @return string Filtered block content.

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*/

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function wp_render_elements_class_name( $block_content, $block ) {

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$class_string = $block['attrs']['className'] ?? '';

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preg_match( '/\bwp-elements-\S+\b/', $class_string, $matches );

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if ( empty( $matches ) ) {

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return $block_content;

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}

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$tags = new WP_HTML_Tag_Processor( $block_content );

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if ( $tags->next_tag() ) {

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$tags->add_class( $matches[0] );

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}

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return $tags->get_updated_html();

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}

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add_filter( 'render_block', 'wp_render_elements_class_name', 10, 2 );

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add_filter( 'render_block_data', 'wp_render_elements_support_styles', 10, 1 );

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