<?php

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/**

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* Generated classname block support flag.

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*

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* @package WordPress

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* @since 5.6.0

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*/

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/**

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* Gets the generated classname from a given block name.

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*

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* @since 5.6.0

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*

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* @access private

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*

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* @param string $block_name Block Name.

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* @return string Generated classname.

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*/

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function wp_get_block_default_classname( $block_name ) {

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// Generated HTML classes for blocks follow the `wp-block-{name}` nomenclature.

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// Blocks provided by WordPress drop the prefixes 'core/' or 'core-' (historically used in 'core-embed/').

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$classname = 'wp-block-' . preg_replace(

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'/^core-/',

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'',

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str_replace( '/', '-', $block_name )

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);

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/**

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* Filters the default block className for server rendered blocks.

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*

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* @since 5.6.0

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*

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* @param string $class_name The current applied classname.

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* @param string $block_name The block name.

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*/

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$classname = apply_filters( 'block_default_classname', $classname, $block_name );

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return $classname;

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}

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/**

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* Adds the generated classnames to the output.

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*

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* @since 5.6.0

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*

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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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* @return array Block CSS classes and inline styles.

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*/

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function wp_apply_generated_classname_support( $block_type ) {

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$attributes = array();

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$has_generated_classname_support = block_has_support( $block_type, 'className', true );

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if ( $has_generated_classname_support ) {

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$block_classname = wp_get_block_default_classname( $block_type->name );

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if ( $block_classname ) {

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$attributes['class'] = $block_classname;

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}

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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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'generated-classname',

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array(

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'apply' => 'wp_apply_generated_classname_support',

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)

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);

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