<?php
/**
* Generated classname block support flag.
*
* @package WordPress
* @since 5.6.0
*/

/**
* Gets the generated classname from a given block name.
*
* @since 5.6.0
*
* @access private
*
* @param string $block_name Block Name.
* @return string Generated classname.
*/
function wp_get_block_default_classname( $block_name ) {
// Generated HTML classes for blocks follow the `wp-block-{name}` nomenclature.
// Blocks provided by WordPress drop the prefixes 'core/' or 'core-' (historically used in 'core-embed/').
$classname = 'wp-block-' . preg_replace(
'/^core-/',
'',
str_replace( '/', '-', $block_name )
);

/**
* Filters the default block className for server rendered blocks.
*
* @since 5.6.0
*
* @param string $class_name The current applied classname.
* @param string $block_name The block name.
*/
$classname = apply_filters( 'block_default_classname', $classname, $block_name );

return $classname;
}

/**
* Adds the generated classnames to the output.
*
* @since 5.6.0
*
* @access private
*
* @param WP_Block_Type $block_type Block Type.
* @return array Block CSS classes and inline styles.
*/
function wp_apply_generated_classname_support( $block_type ) {
$attributes = array();
$has_generated_classname_support = block_has_support( $block_type, 'className', true );
if ( $has_generated_classname_support ) {
$block_classname = wp_get_block_default_classname( $block_type->name );

if ( $block_classname ) {
$attributes['class'] = $block_classname;
}
}

return $attributes;
}

// Register the block support.
WP_Block_Supports::get_instance()->register(
'generated-classname',
array(
'apply' => 'wp_apply_generated_classname_support',
)
);