<?php

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/**

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* Shadow block support flag.

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*

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* @package WordPress

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* @since 6.3.0

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*/

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/**

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* Registers the style and shadow block attributes for block types that support it.

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*

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* @since 6.3.0

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* @access private

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*

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* @param WP_Block_Type $block_type Block Type.

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*/

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function wp_register_shadow_support( $block_type ) {

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$has_shadow_support = block_has_support( $block_type, 'shadow', false );

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if ( ! $has_shadow_support ) {

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return;

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}

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if ( ! $block_type->attributes ) {

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$block_type->attributes = array();

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}

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if ( array_key_exists( 'style', $block_type->attributes ) ) {

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$block_type->attributes['style'] = array(

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'type' => 'object',

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);

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}

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if ( array_key_exists( 'shadow', $block_type->attributes ) ) {

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$block_type->attributes['shadow'] = array(

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'type' => 'string',

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);

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}

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}

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/**

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* Add CSS classes and inline styles for shadow features to the incoming attributes array.

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* This will be applied to the block markup in the front-end.

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*

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* @since 6.3.0

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* @since 6.6.0 Return early if __experimentalSkipSerialization is true.

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* @access private

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*

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* @param WP_Block_Type $block_type Block type.

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* @param array $block_attributes Block attributes.

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* @return array Shadow CSS classes and inline styles.

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*/

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function wp_apply_shadow_support( $block_type, $block_attributes ) {

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$has_shadow_support = block_has_support( $block_type, 'shadow', false );

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if (

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! $has_shadow_support ||

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wp_should_skip_block_supports_serialization( $block_type, 'shadow' )

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) {

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return array();

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}

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$shadow_block_styles = array();

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$custom_shadow = $block_attributes['style']['shadow'] ?? null;

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$shadow_block_styles['shadow'] = $custom_shadow;

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$attributes = array();

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$styles = wp_style_engine_get_styles( $shadow_block_styles );

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if ( ! empty( $styles['css'] ) ) {

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$attributes['style'] = $styles['css'];

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}

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return $attributes;

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}

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// Register the block support.

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WP_Block_Supports::get_instance()->register(

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'shadow',

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array(

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'register_attribute' => 'wp_register_shadow_support',

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'apply' => 'wp_apply_shadow_support',

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)

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);

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