<?php

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/**

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* Block level presets support.

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*

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* @package WordPress

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* @since 6.2.0

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*/

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/**

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* Get the class name used on block level presets.

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*

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* @internal

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*

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* @since 6.2.0

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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_presets_class_name( $block ) {

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

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}

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/**

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* Update the block content with block level presets class name.

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*

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* @internal

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*

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* @since 6.2.0

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* @access private

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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_add_block_level_presets_class( $block_content, $block ) {

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if ( ! $block_content ) {

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return $block_content;

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}

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// return early if the block doesn't have support for settings.

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

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if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {

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return $block_content;

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}

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// return early if no settings are found on the block attributes.

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$block_settings = isset( $block['attrs']['settings'] ) ? $block['attrs']['settings'] : null;

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if ( empty( $block_settings ) ) {

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return $block_content;

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}

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// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.

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// Add the class name to the first element, presuming it's the wrapper, if it exists.

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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( _wp_get_presets_class_name( $block ) );

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}

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return $tags->get_updated_html();

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}

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/**

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* Render the block level presets stylesheet.

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*

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* @internal

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*

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* @since 6.2.0

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* @since 6.3.0 Updated preset styles to use Selectors API.

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* @access private

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*

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* @param string|null $pre_render The pre-rendered content. Default null.

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* @param array $block The block being rendered.

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*

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* @return null

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*/

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function _wp_add_block_level_preset_styles( $pre_render, $block ) {

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// Return early if the block has not support for descendent block styles.

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

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if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {

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return null;

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}

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// return early if no settings are found on the block attributes.

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$block_settings = isset( $block['attrs']['settings'] ) ? $block['attrs']['settings'] : null;

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if ( empty( $block_settings ) ) {

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return null;

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}

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$class_name = '.' . _wp_get_presets_class_name( $block );

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// the root selector for preset variables needs to target every possible block selector

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// in order for the general setting to override any bock specific setting of a parent block or

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// the site root.

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$variables_root_selector = '*,[class*="wp-block"]';

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$registry = WP_Block_Type_Registry::get_instance();

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$blocks = $registry->get_all_registered();

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foreach ( $blocks as $block_type ) {

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/*

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* We only want to append selectors for blocks using custom selectors

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* i.e. not `wp-block-<name>`.

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*/

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$has_custom_selector =

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( isset( $block_type->supports['__experimentalSelector'] ) && is_string( $block_type->supports['__experimentalSelector'] ) ) ||

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( isset( $block_type->selectors['root'] ) && is_string( $block_type->selectors['root'] ) );

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if ( $has_custom_selector ) {

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$variables_root_selector .= ',' . wp_get_block_css_selector( $block_type );

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}

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}

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$variables_root_selector = WP_Theme_JSON::scope_selector( $class_name, $variables_root_selector );

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// Remove any potentially unsafe styles.

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$theme_json_shape = WP_Theme_JSON::remove_insecure_properties(

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array(

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'version' => WP_Theme_JSON::LATEST_SCHEMA,

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'settings' => $block_settings,

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)

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);

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$theme_json_object = new WP_Theme_JSON( $theme_json_shape );

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$styles = '';

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// include preset css variables declaration on the stylesheet.

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$styles .= $theme_json_object->get_stylesheet(

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array( 'variables' ),

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null,

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array(

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'root_selector' => $variables_root_selector,

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'scope' => $class_name,

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)

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);

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// include preset css classes on the the stylesheet.

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$styles .= $theme_json_object->get_stylesheet(

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array( 'presets' ),

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null,

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array(

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'root_selector' => $class_name . ',' . $class_name . ' *',

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'scope' => $class_name,

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)

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);

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if ( ! empty( $styles ) ) {

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wp_enqueue_block_support_styles( $styles );

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}

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return null;

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}

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

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add_filter( 'pre_render_block', '_wp_add_block_level_preset_styles', 10, 2 );

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