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/**
 * Functions related to registering and parsing blocks.
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.0.0
 */

/**
 * Removes the block asset&#039;s path prefix if provided.
 *
 * @since 5.5.0
 *
 * @param string $asset_handle_or_path Asset handle or prefixed path.
 * @return string Path without the prefix or the original value.
 */
function remove_block_asset_path_prefix( $asset_handle_or_path ) {
	$path_prefix = &#039;file:&#039;;
	if ( ! str_starts_with( $asset_handle_or_path, $path_prefix ) ) {
		return $asset_handle_or_path;
	}
	$path = substr(
		$asset_handle_or_path,
		strlen( $path_prefix )
	);
	if ( str_starts_with( $path, &#039;./&#039; ) ) {
		$path = substr( $path, 2 );
	}
	return $path;
}

/**
 * Generates the name for an asset based on the name of the block
 * and the field name provided.
 *
 * @since 5.5.0
 * @since 6.1.0 Added `$index` parameter.
 * @since 6.5.0 Added support for `viewScriptModule` field.
 *
 * @param string $block_name Name of the block.
 * @param string $field_name Name of the metadata field.
 * @param int    $index      Optional. Index of the asset when multiple items passed.
 *                           Default 0.
 * @return string Generated asset name for the block&#039;s field.
 */
function generate_block_asset_handle( $block_name, $field_name, $index = 0 ) {
	if ( str_starts_with( $block_name, &#039;core/&#039; ) ) {
		$asset_handle = str_replace( &#039;core/&#039;, &#039;wp-block-&#039;, $block_name );
		if ( str_starts_with( $field_name, &#039;editor&#039; ) ) {
			$asset_handle .= &#039;-editor&#039;;
		}
		if ( str_starts_with( $field_name, &#039;view&#039; ) ) {
			$asset_handle .= &#039;-view&#039;;
		}
		if ( str_ends_with( strtolower( $field_name ), &#039;scriptmodule&#039; ) ) {
			$asset_handle .= &#039;-script-module&#039;;
		}
		if ( $index &gt; 0 ) {
			$asset_handle .= &#039;-&#039; . ( $index + 1 );
		}
		return $asset_handle;
	}

	$field_mappings = array(
		&#039;editorScript&#039;     =&gt; &#039;editor-script&#039;,
		&#039;editorStyle&#039;      =&gt; &#039;editor-style&#039;,
		&#039;script&#039;           =&gt; &#039;script&#039;,
		&#039;style&#039;            =&gt; &#039;style&#039;,
		&#039;viewScript&#039;       =&gt; &#039;view-script&#039;,
		&#039;viewScriptModule&#039; =&gt; &#039;view-script-module&#039;,
		&#039;viewStyle&#039;        =&gt; &#039;view-style&#039;,
	);
	$asset_handle   = str_replace( &#039;/&#039;, &#039;-&#039;, $block_name ) .
		&#039;-&#039; . $field_mappings[ $field_name ];
	if ( $index &gt; 0 ) {
		$asset_handle .= &#039;-&#039; . ( $index + 1 );
	}
	return $asset_handle;
}

/**
 * Gets the URL to a block asset.
 *
 * @since 6.4.0
 *
 * @param string $path A normalized path to a block asset.
 * @return string|false The URL to the block asset or false on failure.
 */
function get_block_asset_url( $path ) {
	if ( empty( $path ) ) {
		return false;
	}

	// Path needs to be normalized to work in Windows env.
	static $wpinc_path_norm = &#039;&#039;;
	if ( ! $wpinc_path_norm ) {
		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
	}

	if ( str_starts_with( $path, $wpinc_path_norm ) ) {
		return includes_url( str_replace( $wpinc_path_norm, &#039;&#039;, $path ) );
	}

	static $template_paths_norm = array();

	$template = get_template();
	if ( ! isset( $template_paths_norm[ $template ] ) ) {
		$template_paths_norm[ $template ] = wp_normalize_path( realpath( get_template_directory() ) );
	}

	if ( str_starts_with( $path, trailingslashit( $template_paths_norm[ $template ] ) ) ) {
		return get_theme_file_uri( str_replace( $template_paths_norm[ $template ], &#039;&#039;, $path ) );
	}

	if ( is_child_theme() ) {
		$stylesheet = get_stylesheet();
		if ( ! isset( $template_paths_norm[ $stylesheet ] ) ) {
			$template_paths_norm[ $stylesheet ] = wp_normalize_path( realpath( get_stylesheet_directory() ) );
		}

		if ( str_starts_with( $path, trailingslashit( $template_paths_norm[ $stylesheet ] ) ) ) {
			return get_theme_file_uri( str_replace( $template_paths_norm[ $stylesheet ], &#039;&#039;, $path ) );
		}
	}

	return plugins_url( basename( $path ), $path );
}

/**
 * Finds a script module ID for the selected block metadata field. It detects
 * when a path to file was provided and optionally finds a corresponding asset
 * file with details necessary to register the script module under with an
 * automatically generated module ID. It returns unprocessed script module
 * ID otherwise.
 *
 * @since 6.5.0
 *
 * @param array  $metadata   Block metadata.
 * @param string $field_name Field name to pick from metadata.
 * @param int    $index      Optional. Index of the script module ID to register when multiple
 *                           items passed. Default 0.
 * @return string|false Script module ID or false on failure.
 */
function register_block_script_module_id( $metadata, $field_name, $index = 0 ) {
	if ( empty( $metadata[ $field_name ] ) ) {
		return false;
	}

	$module_id = $metadata[ $field_name ];
	if ( is_array( $module_id ) ) {
		if ( empty( $module_id[ $index ] ) ) {
			return false;
		}
		$module_id = $module_id[ $index ];
	}

	$module_path = remove_block_asset_path_prefix( $module_id );
	if ( $module_id === $module_path ) {
		return $module_id;
	}

	$path                  = dirname( $metadata[&#039;file&#039;] );
	$module_asset_raw_path = $path . &#039;/&#039; . substr_replace( $module_path, &#039;.asset.php&#039;, - strlen( &#039;.js&#039; ) );
	$module_id             = generate_block_asset_handle( $metadata[&#039;name&#039;], $field_name, $index );
	$module_asset_path     = wp_normalize_path(
		realpath( $module_asset_raw_path )
	);

	$module_path_norm = wp_normalize_path( realpath( $path . &#039;/&#039; . $module_path ) );
	$module_uri       = get_block_asset_url( $module_path_norm );

	$module_asset        = ! empty( $module_asset_path ) ? require $module_asset_path : array();
	$module_dependencies = isset( $module_asset[&#039;dependencies&#039;] ) ? $module_asset[&#039;dependencies&#039;] : array();
	$block_version       = isset( $metadata[&#039;version&#039;] ) ? $metadata[&#039;version&#039;] : false;
	$module_version      = isset( $module_asset[&#039;version&#039;] ) ? $module_asset[&#039;version&#039;] : $block_version;

	wp_register_script_module(
		$module_id,
		$module_uri,
		$module_dependencies,
		$module_version
	);

	return $module_id;
}

/**
 * Finds a script handle for the selected block metadata field. It detects
 * when a path to file was provided and optionally finds a corresponding asset
 * file with details necessary to register the script under automatically
 * generated handle name. It returns unprocessed script handle otherwise.
 *
 * @since 5.5.0
 * @since 6.1.0 Added `$index` parameter.
 * @since 6.5.0 The asset file is optional. Added script handle support in the asset file.
 *
 * @param array  $metadata   Block metadata.
 * @param string $field_name Field name to pick from metadata.
 * @param int    $index      Optional. Index of the script to register when multiple items passed.
 *                           Default 0.
 * @return string|false Script handle provided directly or created through
 *                      script&#039;s registration, or false on failure.
 */
function register_block_script_handle( $metadata, $field_name, $index = 0 ) {
	if ( empty( $metadata[ $field_name ] ) ) {
		return false;
	}

	$script_handle_or_path = $metadata[ $field_name ];
	if ( is_array( $script_handle_or_path ) ) {
		if ( empty( $script_handle_or_path[ $index ] ) ) {
			return false;
		}
		$script_handle_or_path = $script_handle_or_path[ $index ];
	}

	$script_path = remove_block_asset_path_prefix( $script_handle_or_path );
	if ( $script_handle_or_path === $script_path ) {
		return $script_handle_or_path;
	}

	$path                  = dirname( $metadata[&#039;file&#039;] );
	$script_asset_raw_path = $path . &#039;/&#039; . substr_replace( $script_path, &#039;.asset.php&#039;, - strlen( &#039;.js&#039; ) );
	$script_asset_path     = wp_normalize_path(
		realpath( $script_asset_raw_path )
	);

	// Asset file for blocks is optional. See https://core.trac.wordpress.org/ticket/60460.
	$script_asset  = ! empty( $script_asset_path ) ? require $script_asset_path : array();
	$script_handle = isset( $script_asset[&#039;handle&#039;] ) ?
		$script_asset[&#039;handle&#039;] :
		generate_block_asset_handle( $metadata[&#039;name&#039;], $field_name, $index );
	if ( wp_script_is( $script_handle, &#039;registered&#039; ) ) {
		return $script_handle;
	}

	$script_path_norm    = wp_normalize_path( realpath( $path . &#039;/&#039; . $script_path ) );
	$script_uri          = get_block_asset_url( $script_path_norm );
	$script_dependencies = isset( $script_asset[&#039;dependencies&#039;] ) ? $script_asset[&#039;dependencies&#039;] : array();
	$block_version       = isset( $metadata[&#039;version&#039;] ) ? $metadata[&#039;version&#039;] : false;
	$script_version      = isset( $script_asset[&#039;version&#039;] ) ? $script_asset[&#039;version&#039;] : $block_version;
	$script_args         = array();
	if ( &#039;viewScript&#039; === $field_name &amp;&amp; $script_uri ) {
		$script_args[&#039;strategy&#039;] = &#039;defer&#039;;
	}

	$result = wp_register_script(
		$script_handle,
		$script_uri,
		$script_dependencies,
		$script_version,
		$script_args
	);
	if ( ! $result ) {
		return false;
	}

	if ( ! empty( $metadata[&#039;textdomain&#039;] ) &amp;&amp; in_array( &#039;wp-i18n&#039;, $script_dependencies, true ) ) {
		wp_set_script_translations( $script_handle, $metadata[&#039;textdomain&#039;] );
	}

	return $script_handle;
}

/**
 * Finds a style handle for the block metadata field. It detects when a path
 * to file was provided and registers the style under automatically
 * generated handle name. It returns unprocessed style handle otherwise.
 *
 * @since 5.5.0
 * @since 6.1.0 Added `$index` parameter.
 *
 * @param array  $metadata   Block metadata.
 * @param string $field_name Field name to pick from metadata.
 * @param int    $index      Optional. Index of the style to register when multiple items passed.
 *                           Default 0.
 * @return string|false Style handle provided directly or created through
 *                      style&#039;s registration, or false on failure.
 */
function register_block_style_handle( $metadata, $field_name, $index = 0 ) {
	if ( empty( $metadata[ $field_name ] ) ) {
		return false;
	}

	$style_handle = $metadata[ $field_name ];
	if ( is_array( $style_handle ) ) {
		if ( empty( $style_handle[ $index ] ) ) {
			return false;
		}
		$style_handle = $style_handle[ $index ];
	}

	$style_handle_name = generate_block_asset_handle( $metadata[&#039;name&#039;], $field_name, $index );
	// If the style handle is already registered, skip re-registering.
	if ( wp_style_is( $style_handle_name, &#039;registered&#039; ) ) {
		return $style_handle_name;
	}

	static $wpinc_path_norm = &#039;&#039;;
	if ( ! $wpinc_path_norm ) {
		$wpinc_path_norm = wp_normalize_path( realpath( ABSPATH . WPINC ) );
	}

	$is_core_block = isset( $metadata[&#039;file&#039;] ) &amp;&amp; str_starts_with( $metadata[&#039;file&#039;], $wpinc_path_norm );
	// Skip registering individual styles for each core block when a bundled version provided.
	if ( $is_core_block &amp;&amp; ! wp_should_load_separate_core_block_assets() ) {
		return false;
	}

	$style_path      = remove_block_asset_path_prefix( $style_handle );
	$is_style_handle = $style_handle === $style_path;
	// Allow only passing style handles for core blocks.
	if ( $is_core_block &amp;&amp; ! $is_style_handle ) {
		return false;
	}
	// Return the style handle unless it&#039;s the first item for every core block that requires special treatment.
	if ( $is_style_handle &amp;&amp; ! ( $is_core_block &amp;&amp; 0 === $index ) ) {
		return $style_handle;
	}

	// Check whether styles should have a &quot;.min&quot; suffix or not.
	$suffix = SCRIPT_DEBUG ? &#039;&#039; : &#039;.min&#039;;
	if ( $is_core_block ) {
		$style_path = ( &#039;editorStyle&#039; === $field_name ) ? &quot;editor{$suffix}.css&quot; : &quot;style{$suffix}.css&quot;;
	}

	$style_path_norm = wp_normalize_path( realpath( dirname( $metadata[&#039;file&#039;] ) . &#039;/&#039; . $style_path ) );
	$style_uri       = get_block_asset_url( $style_path_norm );

	$version = ! $is_core_block &amp;&amp; isset( $metadata[&#039;version&#039;] ) ? $metadata[&#039;version&#039;] : false;
	$result  = wp_register_style(
		$style_handle_name,
		$style_uri,
		array(),
		$version
	);
	if ( ! $result ) {
		return false;
	}

	if ( $style_uri ) {
		wp_style_add_data( $style_handle_name, &#039;path&#039;, $style_path_norm );

		if ( $is_core_block ) {
			$rtl_file = str_replace( &quot;{$suffix}.css&quot;, &quot;-rtl{$suffix}.css&quot;, $style_path_norm );
		} else {
			$rtl_file = str_replace( &#039;.css&#039;, &#039;-rtl.css&#039;, $style_path_norm );
		}

		if ( is_rtl() &amp;&amp; file_exists( $rtl_file ) ) {
			wp_style_add_data( $style_handle_name, &#039;rtl&#039;, &#039;replace&#039; );
			wp_style_add_data( $style_handle_name, &#039;suffix&#039;, $suffix );
			wp_style_add_data( $style_handle_name, &#039;path&#039;, $rtl_file );
		}
	}

	return $style_handle_name;
}

/**
 * Gets i18n schema for block&#039;s metadata read from `block.json` file.
 *
 * @since 5.9.0
 *
 * @return object The schema for block&#039;s metadata.
 */
function get_block_metadata_i18n_schema() {
	static $i18n_block_schema;

	if ( ! isset( $i18n_block_schema ) ) {
		$i18n_block_schema = wp_json_file_decode( __DIR__ . &#039;/block-i18n.json&#039; );
	}

	return $i18n_block_schema;
}

/**
 * Registers a block type from the metadata stored in the `block.json` file.
 *
 * @since 5.5.0
 * @since 5.7.0 Added support for `textdomain` field and i18n handling for all translatable fields.
 * @since 5.9.0 Added support for `variations` and `viewScript` fields.
 * @since 6.1.0 Added support for `render` field.
 * @since 6.3.0 Added `selectors` field.
 * @since 6.4.0 Added support for `blockHooks` field.
 * @since 6.5.0 Added support for `allowedBlocks`, `viewScriptModule`, and `viewStyle` fields.
 *
 * @param string $file_or_folder Path to the JSON file with metadata definition for
 *                               the block or path to the folder where the `block.json` file is located.
 *                               If providing the path to a JSON file, the filename must end with `block.json`.
 * @param array  $args           Optional. Array of block type arguments. Accepts any public property
 *                               of `WP_Block_Type`. See WP_Block_Type::__construct() for information
 *                               on accepted arguments. Default empty array.
 * @return WP_Block_Type|false The registered block type on success, or false on failure.
 */
function register_block_type_from_metadata( $file_or_folder, $args = array() ) {
	/*
	 * Get an array of metadata from a PHP file.
	 * This improves performance for core blocks as it&#039;s only necessary to read a single PHP file
	 * instead of reading a JSON file per-block, and then decoding from JSON to PHP.
	 * Using a static variable ensures that the metadata is only read once per request.
	 */
	static $core_blocks_meta;
	if ( ! $core_blocks_meta ) {
		$core_blocks_meta = require ABSPATH . WPINC . &#039;/blocks/blocks-json.php&#039;;
	}

	$metadata_file = ( ! str_ends_with( $file_or_folder, &#039;block.json&#039; ) ) ?
		trailingslashit( $file_or_folder ) . &#039;block.json&#039; :
		$file_or_folder;

	$is_core_block = str_starts_with( $file_or_folder, ABSPATH . WPINC );
	// If the block is not a core block, the metadata file must exist.
	$metadata_file_exists = $is_core_block || file_exists( $metadata_file );
	if ( ! $metadata_file_exists &amp;&amp; empty( $args[&#039;name&#039;] ) ) {
		return false;
	}

	// Try to get metadata from the static cache for core blocks.
	$metadata = array();
	if ( $is_core_block ) {
		$core_block_name = str_replace( ABSPATH . WPINC . &#039;/blocks/&#039;, &#039;&#039;, $file_or_folder );
		if ( ! empty( $core_blocks_meta[ $core_block_name ] ) ) {
			$metadata = $core_blocks_meta[ $core_block_name ];
		}
	}

	// If metadata is not found in the static cache, read it from the file.
	if ( $metadata_file_exists &amp;&amp; empty( $metadata ) ) {
		$metadata = wp_json_file_decode( $metadata_file, array( &#039;associative&#039; =&gt; true ) );
	}

	if ( ! is_array( $metadata ) || ( empty( $metadata[&#039;name&#039;] ) &amp;&amp; empty( $args[&#039;name&#039;] ) ) ) {
		return false;
	}

	$metadata[&#039;file&#039;] = $metadata_file_exists ? wp_normalize_path( realpath( $metadata_file ) ) : null;

	/**
	 * Filters the metadata provided for registering a block type.
	 *
	 * @since 5.7.0
	 *
	 * @param array $metadata Metadata for registering a block type.
	 */
	$metadata = apply_filters( &#039;block_type_metadata&#039;, $metadata );

	// Add `style` and `editor_style` for core blocks if missing.
	if ( ! empty( $metadata[&#039;name&#039;] ) &amp;&amp; str_starts_with( $metadata[&#039;name&#039;], &#039;core/&#039; ) ) {
		$block_name = str_replace( &#039;core/&#039;, &#039;&#039;, $metadata[&#039;name&#039;] );

		if ( ! isset( $metadata[&#039;style&#039;] ) ) {
			$metadata[&#039;style&#039;] = &quot;wp-block-$block_name&quot;;
		}
		if ( current_theme_supports( &#039;wp-block-styles&#039; ) &amp;&amp; wp_should_load_separate_core_block_assets() ) {
			$metadata[&#039;style&#039;]   = (array) $metadata[&#039;style&#039;];
			$metadata[&#039;style&#039;][] = &quot;wp-block-{$block_name}-theme&quot;;
		}
		if ( ! isset( $metadata[&#039;editorStyle&#039;] ) ) {
			$metadata[&#039;editorStyle&#039;] = &quot;wp-block-{$block_name}-editor&quot;;
		}
	}

	$settings          = array();
	$property_mappings = array(
		&#039;apiVersion&#039;      =&gt; &#039;api_version&#039;,
		&#039;name&#039;            =&gt; &#039;name&#039;,
		&#039;title&#039;           =&gt; &#039;title&#039;,
		&#039;category&#039;        =&gt; &#039;category&#039;,
		&#039;parent&#039;          =&gt; &#039;parent&#039;,
		&#039;ancestor&#039;        =&gt; &#039;ancestor&#039;,
		&#039;icon&#039;            =&gt; &#039;icon&#039;,
		&#039;description&#039;     =&gt; &#039;description&#039;,
		&#039;keywords&#039;        =&gt; &#039;keywords&#039;,
		&#039;attributes&#039;      =&gt; &#039;attributes&#039;,
		&#039;providesContext&#039; =&gt; &#039;provides_context&#039;,
		&#039;usesContext&#039;     =&gt; &#039;uses_context&#039;,
		&#039;selectors&#039;       =&gt; &#039;selectors&#039;,
		&#039;supports&#039;        =&gt; &#039;supports&#039;,
		&#039;styles&#039;          =&gt; &#039;styles&#039;,
		&#039;variations&#039;      =&gt; &#039;variations&#039;,
		&#039;example&#039;         =&gt; &#039;example&#039;,
		&#039;allowedBlocks&#039;   =&gt; &#039;allowed_blocks&#039;,
	);
	$textdomain        = ! empty( $metadata[&#039;textdomain&#039;] ) ? $metadata[&#039;textdomain&#039;] : null;
	$i18n_schema       = get_block_metadata_i18n_schema();

	foreach ( $property_mappings as $key =&gt; $mapped_key ) {
		if ( isset( $metadata[ $key ] ) ) {
			$settings[ $mapped_key ] = $metadata[ $key ];
			if ( $metadata_file_exists &amp;&amp; $textdomain &amp;&amp; isset( $i18n_schema-&gt;$key ) ) {
				$settings[ $mapped_key ] = translate_settings_using_i18n_schema( $i18n_schema-&gt;$key, $settings[ $key ], $textdomain );
			}
		}
	}

	if ( ! empty( $metadata[&#039;render&#039;] ) ) {
		$template_path = wp_normalize_path(
			realpath(
				dirname( $metadata[&#039;file&#039;] ) . &#039;/&#039; .
				remove_block_asset_path_prefix( $metadata[&#039;render&#039;] )
			)
		);
		if ( $template_path ) {
			/**
			 * Renders the block on the server.
			 *
			 * @since 6.1.0
			 *
			 * @param array    $attributes Block attributes.
			 * @param string   $content    Block default content.
			 * @param WP_Block $block      Block instance.
			 *
			 * @return string Returns the block content.
			 */
			$settings[&#039;render_callback&#039;] = static function ( $attributes, $content, $block ) use ( $template_path ) {
				ob_start();
				require $template_path;
				return ob_get_clean();
			};
		}
	}

	$settings = array_merge( $settings, $args );

	$script_fields = array(
		&#039;editorScript&#039; =&gt; &#039;editor_script_handles&#039;,
		&#039;script&#039;       =&gt; &#039;script_handles&#039;,
		&#039;viewScript&#039;   =&gt; &#039;view_script_handles&#039;,
	);
	foreach ( $script_fields as $metadata_field_name =&gt; $settings_field_name ) {
		if ( ! empty( $settings[ $metadata_field_name ] ) ) {
			$metadata[ $metadata_field_name ] = $settings[ $metadata_field_name ];
		}
		if ( ! empty( $metadata[ $metadata_field_name ] ) ) {
			$scripts           = $metadata[ $metadata_field_name ];
			$processed_scripts = array();
			if ( is_array( $scripts ) ) {
				for ( $index = 0; $index &lt; count( $scripts ); $index++ ) {
					$result = register_block_script_handle(
						$metadata,
						$metadata_field_name,
						$index
					);
					if ( $result ) {
						$processed_scripts[] = $result;
					}
				}
			} else {
				$result = register_block_script_handle(
					$metadata,
					$metadata_field_name
				);
				if ( $result ) {
					$processed_scripts[] = $result;
				}
			}
			$settings[ $settings_field_name ] = $processed_scripts;
		}
	}

	$module_fields = array(
		&#039;viewScriptModule&#039; =&gt; &#039;view_script_module_ids&#039;,
	);
	foreach ( $module_fields as $metadata_field_name =&gt; $settings_field_name ) {
		if ( ! empty( $settings[ $metadata_field_name ] ) ) {
			$metadata[ $metadata_field_name ] = $settings[ $metadata_field_name ];
		}
		if ( ! empty( $metadata[ $metadata_field_name ] ) ) {
			$modules           = $metadata[ $metadata_field_name ];
			$processed_modules = array();
			if ( is_array( $modules ) ) {
				for ( $index = 0; $index &lt; count( $modules ); $index++ ) {
					$result = register_block_script_module_id(
						$metadata,
						$metadata_field_name,
						$index
					);
					if ( $result ) {
						$processed_modules[] = $result;
					}
				}
			} else {
				$result = register_block_script_module_id(
					$metadata,
					$metadata_field_name
				);
				if ( $result ) {
					$processed_modules[] = $result;
				}
			}
			$settings[ $settings_field_name ] = $processed_modules;
		}
	}

	$style_fields = array(
		&#039;editorStyle&#039; =&gt; &#039;editor_style_handles&#039;,
		&#039;style&#039;       =&gt; &#039;style_handles&#039;,
		&#039;viewStyle&#039;   =&gt; &#039;view_style_handles&#039;,
	);
	foreach ( $style_fields as $metadata_field_name =&gt; $settings_field_name ) {
		if ( ! empty( $settings[ $metadata_field_name ] ) ) {
			$metadata[ $metadata_field_name ] = $settings[ $metadata_field_name ];
		}
		if ( ! empty( $metadata[ $metadata_field_name ] ) ) {
			$styles           = $metadata[ $metadata_field_name ];
			$processed_styles = array();
			if ( is_array( $styles ) ) {
				for ( $index = 0; $index &lt; count( $styles ); $index++ ) {
					$result = register_block_style_handle(
						$metadata,
						$metadata_field_name,
						$index
					);
					if ( $result ) {
						$processed_styles[] = $result;
					}
				}
			} else {
				$result = register_block_style_handle(
					$metadata,
					$metadata_field_name
				);
				if ( $result ) {
					$processed_styles[] = $result;
				}
			}
			$settings[ $settings_field_name ] = $processed_styles;
		}
	}

	if ( ! empty( $metadata[&#039;blockHooks&#039;] ) ) {
		/**
		 * Map camelCased position string (from block.json) to snake_cased block type position.
		 *
		 * @var array
		 */
		$position_mappings = array(
			&#039;before&#039;     =&gt; &#039;before&#039;,
			&#039;after&#039;      =&gt; &#039;after&#039;,
			&#039;firstChild&#039; =&gt; &#039;first_child&#039;,
			&#039;lastChild&#039;  =&gt; &#039;last_child&#039;,
		);

		$settings[&#039;block_hooks&#039;] = array();
		foreach ( $metadata[&#039;blockHooks&#039;] as $anchor_block_name =&gt; $position ) {
			// Avoid infinite recursion (hooking to itself).
			if ( $metadata[&#039;name&#039;] === $anchor_block_name ) {
				_doing_it_wrong(
					__METHOD__,
					__( &#039;Cannot hook block to itself.&#039; ),
					&#039;6.4.0&#039;
				);
				continue;
			}

			if ( ! isset( $position_mappings[ $position ] ) ) {
				continue;
			}

			$settings[&#039;block_hooks&#039;][ $anchor_block_name ] = $position_mappings[ $position ];
		}
	}

	/**
	 * Filters the settings determined from the block type metadata.
	 *
	 * @since 5.7.0
	 *
	 * @param array $settings Array of determined settings for registering a block type.
	 * @param array $metadata Metadata provided for registering a block type.
	 */
	$settings = apply_filters( &#039;block_type_metadata_settings&#039;, $settings, $metadata );

	$metadata[&#039;name&#039;] = ! empty( $settings[&#039;name&#039;] ) ? $settings[&#039;name&#039;] : $metadata[&#039;name&#039;];

	return WP_Block_Type_Registry::get_instance()-&gt;register(
		$metadata[&#039;name&#039;],
		$settings
	);
}

/**
 * Registers a block type. The recommended way is to register a block type using
 * the metadata stored in the `block.json` file.
 *
 * @since 5.0.0
 * @since 5.8.0 First parameter now accepts a path to the `block.json` file.
 *
 * @param string|WP_Block_Type $block_type Block type name including namespace, or alternatively
 *                                         a path to the JSON file with metadata definition for the block,
 *                                         or a path to the folder where the `block.json` file is located,
 *                                         or a complete WP_Block_Type instance.
 *                                         In case a WP_Block_Type is provided, the $args parameter will be ignored.
 * @param array                $args       Optional. Array of block type arguments. Accepts any public property
 *                                         of `WP_Block_Type`. See WP_Block_Type::__construct() for information
 *                                         on accepted arguments. Default empty array.
 *
 * @return WP_Block_Type|false The registered block type on success, or false on failure.
 */
function register_block_type( $block_type, $args = array() ) {
	if ( is_string( $block_type ) &amp;&amp; file_exists( $block_type ) ) {
		return register_block_type_from_metadata( $block_type, $args );
	}

	return WP_Block_Type_Registry::get_instance()-&gt;register( $block_type, $args );
}

/**
 * Unregisters a block type.
 *
 * @since 5.0.0
 *
 * @param string|WP_Block_Type $name Block type name including namespace, or alternatively
 *                                   a complete WP_Block_Type instance.
 * @return WP_Block_Type|false The unregistered block type on success, or false on failure.
 */
function unregister_block_type( $name ) {
	return WP_Block_Type_Registry::get_instance()-&gt;unregister( $name );
}

/**
 * Determines whether a post or content string has blocks.
 *
 * This test optimizes for performance rather than strict accuracy, detecting
 * the pattern of a block but not validating its structure. For strict accuracy,
 * you should use the block parser on post content.
 *
 * @since 5.0.0
 *
 * @see parse_blocks()
 *
 * @param int|string|WP_Post|null $post Optional. Post content, post ID, or post object.
 *                                      Defaults to global $post.
 * @return bool Whether the post has blocks.
 */
function has_blocks( $post = null ) {
	if ( ! is_string( $post ) ) {
		$wp_post = get_post( $post );

		if ( ! $wp_post instanceof WP_Post ) {
			return false;
		}

		$post = $wp_post-&gt;post_content;
	}

	return str_contains( (string) $post, &#039;&lt;!-- wp:&#039; );
}

/**
 * Determines whether a $post or a string contains a specific block type.
 *
 * This test optimizes for performance rather than strict accuracy, detecting
 * whether the block type exists but not validating its structure and not checking
 * synced patterns (formerly called reusable blocks). For strict accuracy,
 * you should use the block parser on post content.
 *
 * @since 5.0.0
 *
 * @see parse_blocks()
 *
 * @param string                  $block_name Full block type to look for.
 * @param int|string|WP_Post|null $post       Optional. Post content, post ID, or post object.
 *                                            Defaults to global $post.
 * @return bool Whether the post content contains the specified block.
 */
function has_block( $block_name, $post = null ) {
	if ( ! has_blocks( $post ) ) {
		return false;
	}

	if ( ! is_string( $post ) ) {
		$wp_post = get_post( $post );
		if ( $wp_post instanceof WP_Post ) {
			$post = $wp_post-&gt;post_content;
		}
	}

	/*
	 * Normalize block name to include namespace, if provided as non-namespaced.
	 * This matches behavior for WordPress 5.0.0 - 5.3.0 in matching blocks by
	 * their serialized names.
	 */
	if ( ! str_contains( $block_name, &#039;/&#039; ) ) {
		$block_name = &#039;core/&#039; . $block_name;
	}

	// Test for existence of block by its fully qualified name.
	$has_block = str_contains( $post, &#039;&lt;!-- wp:&#039; . $block_name . &#039; &#039; );

	if ( ! $has_block ) {
		/*
		 * If the given block name would serialize to a different name, test for
		 * existence by the serialized form.
		 */
		$serialized_block_name = strip_core_block_namespace( $block_name );
		if ( $serialized_block_name !== $block_name ) {
			$has_block = str_contains( $post, &#039;&lt;!-- wp:&#039; . $serialized_block_name . &#039; &#039; );
		}
	}

	return $has_block;
}

/**
 * Returns an array of the names of all registered dynamic block types.
 *
 * @since 5.0.0
 *
 * @return string[] Array of dynamic block names.
 */
function get_dynamic_block_names() {
	$dynamic_block_names = array();

	$block_types = WP_Block_Type_Registry::get_instance()-&gt;get_all_registered();
	foreach ( $block_types as $block_type ) {
		if ( $block_type-&gt;is_dynamic() ) {
			$dynamic_block_names[] = $block_type-&gt;name;
		}
	}

	return $dynamic_block_names;
}

/**
 * Retrieves block types hooked into the given block, grouped by anchor block type and the relative position.
 *
 * @since 6.4.0
 *
 * @return array[] Array of block types grouped by anchor block type and the relative position.
 */
function get_hooked_blocks() {
	$block_types   = WP_Block_Type_Registry::get_instance()-&gt;get_all_registered();
	$hooked_blocks = array();
	foreach ( $block_types as $block_type ) {
		if ( ! ( $block_type instanceof WP_Block_Type ) || ! is_array( $block_type-&gt;block_hooks ) ) {
			continue;
		}
		foreach ( $block_type-&gt;block_hooks as $anchor_block_type =&gt; $relative_position ) {
			if ( ! isset( $hooked_blocks[ $anchor_block_type ] ) ) {
				$hooked_blocks[ $anchor_block_type ] = array();
			}
			if ( ! isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] ) ) {
				$hooked_blocks[ $anchor_block_type ][ $relative_position ] = array();
			}
			$hooked_blocks[ $anchor_block_type ][ $relative_position ][] = $block_type-&gt;name;
		}
	}

	return $hooked_blocks;
}

/**
 * Returns the markup for blocks hooked to the given anchor block in a specific relative position.
 *
 * @since 6.5.0
 * @access private
 *
 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
 * @param string                          $relative_position   The relative position of the hooked blocks.
 *                                                             Can be one of &#039;before&#039;, &#039;after&#039;, &#039;first_child&#039;, or &#039;last_child&#039;.
 * @param array                           $hooked_blocks       An array of hooked block types, grouped by anchor block and relative position.
 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, or pattern that the anchor block belongs to.
 * @return string
 */
function insert_hooked_blocks( &amp;$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
	$anchor_block_type  = $parsed_anchor_block[&#039;blockName&#039;];
	$hooked_block_types = isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] )
		? $hooked_blocks[ $anchor_block_type ][ $relative_position ]
		: array();

	/**
	 * Filters the list of hooked block types for a given anchor block type and relative position.
	 *
	 * @since 6.4.0
	 *
	 * @param string[]                        $hooked_block_types The list of hooked block types.
	 * @param string                          $relative_position  The relative position of the hooked blocks.
	 *                                                            Can be one of &#039;before&#039;, &#039;after&#039;, &#039;first_child&#039;, or &#039;last_child&#039;.
	 * @param string                          $anchor_block_type  The anchor block type.
	 * @param WP_Block_Template|WP_Post|array $context            The block template, template part, `wp_navigation` post type,
	 *                                                            or pattern that the anchor block belongs to.
	 */
	$hooked_block_types = apply_filters( &#039;hooked_block_types&#039;, $hooked_block_types, $relative_position, $anchor_block_type, $context );

	$markup = &#039;&#039;;
	foreach ( $hooked_block_types as $hooked_block_type ) {
		$parsed_hooked_block = array(
			&#039;blockName&#039;    =&gt; $hooked_block_type,
			&#039;attrs&#039;        =&gt; array(),
			&#039;innerBlocks&#039;  =&gt; array(),
			&#039;innerContent&#039; =&gt; array(),
		);

		/**
		 * Filters the parsed block array for a given hooked block.
		 *
		 * @since 6.5.0
		 *
		 * @param array|null                      $parsed_hooked_block The parsed block array for the given hooked block type, or null to suppress the block.
		 * @param string                          $hooked_block_type   The hooked block type name.
		 * @param string                          $relative_position   The relative position of the hooked block.
		 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
		 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, `wp_navigation` post type,
		 *                                                             or pattern that the anchor block belongs to.
		 */
		$parsed_hooked_block = apply_filters( &#039;hooked_block&#039;, $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		/**
		 * Filters the parsed block array for a given hooked block.
		 *
		 * The dynamic portion of the hook name, `$hooked_block_type`, refers to the block type name of the specific hooked block.
		 *
		 * @since 6.5.0
		 *
		 * @param array|null                      $parsed_hooked_block The parsed block array for the given hooked block type, or null to suppress the block.
		 * @param string                          $hooked_block_type   The hooked block type name.
		 * @param string                          $relative_position   The relative position of the hooked block.
		 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
		 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, `wp_navigation` post type,
		 *                                                             or pattern that the anchor block belongs to.
		 */
		$parsed_hooked_block = apply_filters( &quot;hooked_block_{$hooked_block_type}&quot;, $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		if ( null === $parsed_hooked_block ) {
			continue;
		}

		// It&#039;s possible that the filter returned a block of a different type, so we explicitly
		// look for the original `$hooked_block_type` in the `ignoredHookedBlocks` metadata.
		if (
			! isset( $parsed_anchor_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;] ) ||
			! in_array( $hooked_block_type, $parsed_anchor_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;], true )
		) {
			$markup .= serialize_block( $parsed_hooked_block );
		}
	}

	return $markup;
}

/**
 * Adds a list of hooked block types to an anchor block&#039;s ignored hooked block types.
 *
 * This function is meant for internal use only.
 *
 * @since 6.5.0
 * @access private
 *
 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
 * @param string                          $relative_position   The relative position of the hooked blocks.
 *                                                             Can be one of &#039;before&#039;, &#039;after&#039;, &#039;first_child&#039;, or &#039;last_child&#039;.
 * @param array                           $hooked_blocks       An array of hooked block types, grouped by anchor block and relative position.
 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, or pattern that the anchor block belongs to.
 * @return string Empty string.
 */
function set_ignored_hooked_blocks_metadata( &amp;$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
	$anchor_block_type  = $parsed_anchor_block[&#039;blockName&#039;];
	$hooked_block_types = isset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] )
		? $hooked_blocks[ $anchor_block_type ][ $relative_position ]
		: array();

	/** This filter is documented in wp-includes/blocks.php */
	$hooked_block_types = apply_filters( &#039;hooked_block_types&#039;, $hooked_block_types, $relative_position, $anchor_block_type, $context );
	if ( empty( $hooked_block_types ) ) {
		return &#039;&#039;;
	}

	foreach ( $hooked_block_types as $index =&gt; $hooked_block_type ) {
		$parsed_hooked_block = array(
			&#039;blockName&#039;    =&gt; $hooked_block_type,
			&#039;attrs&#039;        =&gt; array(),
			&#039;innerBlocks&#039;  =&gt; array(),
			&#039;innerContent&#039; =&gt; array(),
		);

		/** This filter is documented in wp-includes/blocks.php */
		$parsed_hooked_block = apply_filters( &#039;hooked_block&#039;, $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		/** This filter is documented in wp-includes/blocks.php */
		$parsed_hooked_block = apply_filters( &quot;hooked_block_{$hooked_block_type}&quot;, $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

		if ( null === $parsed_hooked_block ) {
			unset( $hooked_block_types[ $index ] );
		}
	}

	$previously_ignored_hooked_blocks = isset( $parsed_anchor_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;] )
		? $parsed_anchor_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;]
		: array();

	$parsed_anchor_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;] = array_unique(
		array_merge(
			$previously_ignored_hooked_blocks,
			$hooked_block_types
		)
	);

	// Markup for the hooked blocks has already been created (in `insert_hooked_blocks`).
	return &#039;&#039;;
}

/**
 * Runs the hooked blocks algorithm on the given content.
 *
 * @since 6.6.0
 * @access private
 *
 * @param string                          $content  Serialized content.
 * @param WP_Block_Template|WP_Post|array $context  A block template, template part, `wp_navigation` post object,
 *                                                  or pattern that the blocks belong to.
 * @param callable                        $callback A function that will be called for each block to generate
 *                                                  the markup for a given list of blocks that are hooked to it.
 *                                                  Default: &#039;insert_hooked_blocks&#039;.
 * @return string The serialized markup.
 */
function apply_block_hooks_to_content( $content, $context, $callback = &#039;insert_hooked_blocks&#039; ) {
	$hooked_blocks = get_hooked_blocks();
	if ( empty( $hooked_blocks ) &amp;&amp; ! has_filter( &#039;hooked_block_types&#039; ) ) {
		return $content;
	}

	$blocks = parse_blocks( $content );

	$before_block_visitor = make_before_block_visitor( $hooked_blocks, $context, $callback );
	$after_block_visitor  = make_after_block_visitor( $hooked_blocks, $context, $callback );

	return traverse_and_serialize_blocks( $blocks, $before_block_visitor, $after_block_visitor );
}

/**
 * Accepts the serialized markup of a block and its inner blocks, and returns serialized markup of the inner blocks.
 *
 * @since 6.6.0
 * @access private
 *
 * @param string $serialized_block The serialized markup of a block and its inner blocks.
 * @return string The serialized markup of the inner blocks.
 */
function remove_serialized_parent_block( $serialized_block ) {
	$start = strpos( $serialized_block, &#039;--&gt;&#039; ) + strlen( &#039;--&gt;&#039; );
	$end   = strrpos( $serialized_block, &#039;&lt;!--&#039; );
	return substr( $serialized_block, $start, $end - $start );
}

/**
 * Updates the wp_postmeta with the list of ignored hooked blocks where the inner blocks are stored as post content.
 * Currently only supports `wp_navigation` post types.
 *
 * @since 6.6.0
 * @access private
 *
 * @param stdClass $post Post object.
 * @return stdClass The updated post object.
 */
function update_ignored_hooked_blocks_postmeta( $post ) {
	/*
	 * In this scenario the user has likely tried to create a navigation via the REST API.
	 * In which case we won&#039;t have a post ID to work with and store meta against.
	 */
	if ( empty( $post-&gt;ID ) ) {
		return $post;
	}

	/*
	 * Skip meta generation when consumers intentionally update specific Navigation fields
	 * and omit the content update.
	 */
	if ( ! isset( $post-&gt;post_content ) ) {
		return $post;
	}

	/*
	 * Skip meta generation when the post content is not a navigation block.
	 */
	if ( ! isset( $post-&gt;post_type ) || &#039;wp_navigation&#039; !== $post-&gt;post_type ) {
		return $post;
	}

	$attributes = array();

	$ignored_hooked_blocks = get_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, true );
	if ( ! empty( $ignored_hooked_blocks ) ) {
		$ignored_hooked_blocks  = json_decode( $ignored_hooked_blocks, true );
		$attributes[&#039;metadata&#039;] = array(
			&#039;ignoredHookedBlocks&#039; =&gt; $ignored_hooked_blocks,
		);
	}

	$markup = get_comment_delimited_block_content(
		&#039;core/navigation&#039;,
		$attributes,
		$post-&gt;post_content
	);

	$serialized_block = apply_block_hooks_to_content( $markup, get_post( $post-&gt;ID ), &#039;set_ignored_hooked_blocks_metadata&#039; );
	$root_block       = parse_blocks( $serialized_block )[0];

	$ignored_hooked_blocks = isset( $root_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;] )
		? $root_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;]
		: array();

	if ( ! empty( $ignored_hooked_blocks ) ) {
		$existing_ignored_hooked_blocks = get_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, true );
		if ( ! empty( $existing_ignored_hooked_blocks ) ) {
			$existing_ignored_hooked_blocks = json_decode( $existing_ignored_hooked_blocks, true );
			$ignored_hooked_blocks          = array_unique( array_merge( $ignored_hooked_blocks, $existing_ignored_hooked_blocks ) );
		}
		update_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, json_encode( $ignored_hooked_blocks ) );
	}

	$post-&gt;post_content = remove_serialized_parent_block( $serialized_block );
	return $post;
}

/**
 * Returns the markup for blocks hooked to the given anchor block in a specific relative position and then
 * adds a list of hooked block types to an anchor block&#039;s ignored hooked block types.
 *
 * This function is meant for internal use only.
 *
 * @since 6.6.0
 * @access private
 *
 * @param array                           $parsed_anchor_block The anchor block, in parsed block array format.
 * @param string                          $relative_position   The relative position of the hooked blocks.
 *                                                             Can be one of &#039;before&#039;, &#039;after&#039;, &#039;first_child&#039;, or &#039;last_child&#039;.
 * @param array                           $hooked_blocks       An array of hooked block types, grouped by anchor block and relative position.
 * @param WP_Block_Template|WP_Post|array $context             The block template, template part, or pattern that the anchor block belongs to.
 * @return string
 */
function insert_hooked_blocks_and_set_ignored_hooked_blocks_metadata( &amp;$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
	$markup  = insert_hooked_blocks( $parsed_anchor_block, $relative_position, $hooked_blocks, $context );
	$markup .= set_ignored_hooked_blocks_metadata( $parsed_anchor_block, $relative_position, $hooked_blocks, $context );

	return $markup;
}

/**
 * Hooks into the REST API response for the core/navigation block and adds the first and last inner blocks.
 *
 * @since 6.6.0
 *
 * @param WP_REST_Response $response The response object.
 * @param WP_Post          $post     Post object.
 * @return WP_REST_Response The response object.
 */
function insert_hooked_blocks_into_rest_response( $response, $post ) {
	if ( ! isset( $response-&gt;data[&#039;content&#039;][&#039;raw&#039;] ) || ! isset( $response-&gt;data[&#039;content&#039;][&#039;rendered&#039;] ) ) {
		return $response;
	}

	$attributes            = array();
	$ignored_hooked_blocks = get_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, true );
	if ( ! empty( $ignored_hooked_blocks ) ) {
		$ignored_hooked_blocks  = json_decode( $ignored_hooked_blocks, true );
		$attributes[&#039;metadata&#039;] = array(
			&#039;ignoredHookedBlocks&#039; =&gt; $ignored_hooked_blocks,
		);
	}
	$content = get_comment_delimited_block_content(
		&#039;core/navigation&#039;,
		$attributes,
		$response-&gt;data[&#039;content&#039;][&#039;raw&#039;]
	);

	$content = apply_block_hooks_to_content( $content, $post );

	// Remove mock Navigation block wrapper.
	$content = remove_serialized_parent_block( $content );

	$response-&gt;data[&#039;content&#039;][&#039;raw&#039;] = $content;

	/** This filter is documented in wp-includes/post-template.php */
	$response-&gt;data[&#039;content&#039;][&#039;rendered&#039;] = apply_filters( &#039;the_content&#039;, $content );

	return $response;
}

/**
 * Returns a function that injects the theme attribute into, and hooked blocks before, a given block.
 *
 * The returned function can be used as `$pre_callback` argument to `traverse_and_serialize_block(s)`,
 * where it will inject the `theme` attribute into all Template Part blocks, and prepend the markup for
 * any blocks hooked `before` the given block and as its parent&#039;s `first_child`, respectively.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @since 6.5.0 Added $callback argument.
 * @access private
 *
 * @param array                           $hooked_blocks An array of blocks hooked to another given block.
 * @param WP_Block_Template|WP_Post|array $context       A block template, template part, `wp_navigation` post object,
 *                                                       or pattern that the blocks belong to.
 * @param callable                        $callback      A function that will be called for each block to generate
 *                                                       the markup for a given list of blocks that are hooked to it.
 *                                                       Default: &#039;insert_hooked_blocks&#039;.
 * @return callable A function that returns the serialized markup for the given block,
 *                  including the markup for any hooked blocks before it.
 */
function make_before_block_visitor( $hooked_blocks, $context, $callback = &#039;insert_hooked_blocks&#039; ) {
	/**
	 * Injects hooked blocks before the given block, injects the `theme` attribute into Template Part blocks, and returns the serialized markup.
	 *
	 * If the current block is a Template Part block, inject the `theme` attribute.
	 * Furthermore, prepend the markup for any blocks hooked `before` the given block and as its parent&#039;s
	 * `first_child`, respectively, to the serialized markup for the given block.
	 *
	 * @param array $block        The block to inject the theme attribute into, and hooked blocks before. Passed by reference.
	 * @param array $parent_block The parent block of the given block. Passed by reference. Default null.
	 * @param array $prev         The previous sibling block of the given block. Default null.
	 * @return string The serialized markup for the given block, with the markup for any hooked blocks prepended to it.
	 */
	return function ( &amp;$block, &amp;$parent_block = null, $prev = null ) use ( $hooked_blocks, $context, $callback ) {
		_inject_theme_attribute_in_template_part_block( $block );

		$markup = &#039;&#039;;

		if ( $parent_block &amp;&amp; ! $prev ) {
			// Candidate for first-child insertion.
			$markup .= call_user_func_array(
				$callback,
				array( &amp;$parent_block, &#039;first_child&#039;, $hooked_blocks, $context )
			);
		}

		$markup .= call_user_func_array(
			$callback,
			array( &amp;$block, &#039;before&#039;, $hooked_blocks, $context )
		);

		return $markup;
	};
}

/**
 * Returns a function that injects the hooked blocks after a given block.
 *
 * The returned function can be used as `$post_callback` argument to `traverse_and_serialize_block(s)`,
 * where it will append the markup for any blocks hooked `after` the given block and as its parent&#039;s
 * `last_child`, respectively.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @since 6.5.0 Added $callback argument.
 * @access private
 *
 * @param array                           $hooked_blocks An array of blocks hooked to another block.
 * @param WP_Block_Template|WP_Post|array $context       A block template, template part, `wp_navigation` post object,
 *                                                       or pattern that the blocks belong to.
 * @param callable                        $callback      A function that will be called for each block to generate
 *                                                       the markup for a given list of blocks that are hooked to it.
 *                                                       Default: &#039;insert_hooked_blocks&#039;.
 * @return callable A function that returns the serialized markup for the given block,
 *                  including the markup for any hooked blocks after it.
 */
function make_after_block_visitor( $hooked_blocks, $context, $callback = &#039;insert_hooked_blocks&#039; ) {
	/**
	 * Injects hooked blocks after the given block, and returns the serialized markup.
	 *
	 * Append the markup for any blocks hooked `after` the given block and as its parent&#039;s
	 * `last_child`, respectively, to the serialized markup for the given block.
	 *
	 * @param array $block        The block to inject the hooked blocks after. Passed by reference.
	 * @param array $parent_block The parent block of the given block. Passed by reference. Default null.
	 * @param array $next         The next sibling block of the given block. Default null.
	 * @return string The serialized markup for the given block, with the markup for any hooked blocks appended to it.
	 */
	return function ( &amp;$block, &amp;$parent_block = null, $next = null ) use ( $hooked_blocks, $context, $callback ) {
		$markup = call_user_func_array(
			$callback,
			array( &amp;$block, &#039;after&#039;, $hooked_blocks, $context )
		);

		if ( $parent_block &amp;&amp; ! $next ) {
			// Candidate for last-child insertion.
			$markup .= call_user_func_array(
				$callback,
				array( &amp;$parent_block, &#039;last_child&#039;, $hooked_blocks, $context )
			);
		}

		return $markup;
	};
}

/**
 * Given an array of attributes, returns a string in the serialized attributes
 * format prepared for post content.
 *
 * The serialized result is a JSON-encoded string, with unicode escape sequence
 * substitution for characters which might otherwise interfere with embedding
 * the result in an HTML comment.
 *
 * This function must produce output that remains in sync with the output of
 * the serializeAttributes JavaScript function in the block editor in order
 * to ensure consistent operation between PHP and JavaScript.
 *
 * @since 5.3.1
 *
 * @param array $block_attributes Attributes object.
 * @return string Serialized attributes.
 */
function serialize_block_attributes( $block_attributes ) {
	$encoded_attributes = wp_json_encode( $block_attributes, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE );
	$encoded_attributes = preg_replace( &#039;/--/&#039;, &#039;\\u002d\\u002d&#039;, $encoded_attributes );
	$encoded_attributes = preg_replace( &#039;/&lt;/&#039;, &#039;\\u003c&#039;, $encoded_attributes );
	$encoded_attributes = preg_replace( &#039;/&gt;/&#039;, &#039;\\u003e&#039;, $encoded_attributes );
	$encoded_attributes = preg_replace( &#039;/&amp;/&#039;, &#039;\\u0026&#039;, $encoded_attributes );
	// Regex: /\\&quot;/
	$encoded_attributes = preg_replace( &#039;/\\\\&quot;/&#039;, &#039;\\u0022&#039;, $encoded_attributes );

	return $encoded_attributes;
}

/**
 * Returns the block name to use for serialization. This will remove the default
 * &quot;core/&quot; namespace from a block name.
 *
 * @since 5.3.1
 *
 * @param string|null $block_name Optional. Original block name. Null if the block name is unknown,
 *                                e.g. Classic blocks have their name set to null. Default null.
 * @return string Block name to use for serialization.
 */
function strip_core_block_namespace( $block_name = null ) {
	if ( is_string( $block_name ) &amp;&amp; str_starts_with( $block_name, &#039;core/&#039; ) ) {
		return substr( $block_name, 5 );
	}

	return $block_name;
}

/**
 * Returns the content of a block, including comment delimiters.
 *
 * @since 5.3.1
 *
 * @param string|null $block_name       Block name. Null if the block name is unknown,
 *                                      e.g. Classic blocks have their name set to null.
 * @param array       $block_attributes Block attributes.
 * @param string      $block_content    Block save content.
 * @return string Comment-delimited block content.
 */
function get_comment_delimited_block_content( $block_name, $block_attributes, $block_content ) {
	if ( is_null( $block_name ) ) {
		return $block_content;
	}

	$serialized_block_name = strip_core_block_namespace( $block_name );
	$serialized_attributes = empty( $block_attributes ) ? &#039;&#039; : serialize_block_attributes( $block_attributes ) . &#039; &#039;;

	if ( empty( $block_content ) ) {
		return sprintf( &#039;&lt;!-- wp:%s %s/--&gt;&#039;, $serialized_block_name, $serialized_attributes );
	}

	return sprintf(
		&#039;&lt;!-- wp:%s %s--&gt;%s&lt;!-- /wp:%s --&gt;&#039;,
		$serialized_block_name,
		$serialized_attributes,
		$block_content,
		$serialized_block_name
	);
}

/**
 * Returns the content of a block, including comment delimiters, serializing all
 * attributes from the given parsed block.
 *
 * This should be used when preparing a block to be saved to post content.
 * Prefer `render_block` when preparing a block for display. Unlike
 * `render_block`, this does not evaluate a block&#039;s `render_callback`, and will
 * instead preserve the markup as parsed.
 *
 * @since 5.3.1
 *
 * @param array $block {
 *     A representative array of a single parsed block object. See WP_Block_Parser_Block.
 *
 *     @type string   $blockName    Name of block.
 *     @type array    $attrs        Attributes from block comment delimiters.
 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                  have the same structure as this one.
 *     @type string   $innerHTML    HTML from inside block comment delimiters.
 *     @type array    $innerContent List of string fragments and null markers where
 *                                  inner blocks were found.
 * }
 * @return string String of rendered HTML.
 */
function serialize_block( $block ) {
	$block_content = &#039;&#039;;

	$index = 0;
	foreach ( $block[&#039;innerContent&#039;] as $chunk ) {
		$block_content .= is_string( $chunk ) ? $chunk : serialize_block( $block[&#039;innerBlocks&#039;][ $index++ ] );
	}

	if ( ! is_array( $block[&#039;attrs&#039;] ) ) {
		$block[&#039;attrs&#039;] = array();
	}

	return get_comment_delimited_block_content(
		$block[&#039;blockName&#039;],
		$block[&#039;attrs&#039;],
		$block_content
	);
}

/**
 * Returns a joined string of the aggregate serialization of the given
 * parsed blocks.
 *
 * @since 5.3.1
 *
 * @param array[] $blocks {
 *     Array of block structures.
 *
 *     @type array ...$0 {
 *         A representative array of a single parsed block object. See WP_Block_Parser_Block.
 *
 *         @type string   $blockName    Name of block.
 *         @type array    $attrs        Attributes from block comment delimiters.
 *         @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                      have the same structure as this one.
 *         @type string   $innerHTML    HTML from inside block comment delimiters.
 *         @type array    $innerContent List of string fragments and null markers where
 *                                      inner blocks were found.
 *     }
 * }
 * @return string String of rendered HTML.
 */
function serialize_blocks( $blocks ) {
	return implode( &#039;&#039;, array_map( &#039;serialize_block&#039;, $blocks ) );
}

/**
 * Traverses a parsed block tree and applies callbacks before and after serializing it.
 *
 * Recursively traverses the block and its inner blocks and applies the two callbacks provided as
 * arguments, the first one before serializing the block, and the second one after serializing it.
 * If either callback returns a string value, it will be prepended and appended to the serialized
 * block markup, respectively.
 *
 * The callbacks will receive a reference to the current block as their first argument, so that they
 * can also modify it, and the current block&#039;s parent block as second argument. Finally, the
 * `$pre_callback` receives the previous block, whereas the `$post_callback` receives
 * the next block as third argument.
 *
 * Serialized blocks are returned including comment delimiters, and with all attributes serialized.
 *
 * This function should be used when there is a need to modify the saved block, or to inject markup
 * into the return value. Prefer `serialize_block` when preparing a block to be saved to post content.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @access private
 *
 * @see serialize_block()
 *
 * @param array    $block         A representative array of a single parsed block object. See WP_Block_Parser_Block.
 * @param callable $pre_callback  Callback to run on each block in the tree before it is traversed and serialized.
 *                                It is called with the following arguments: &amp;$block, $parent_block, $previous_block.
 *                                Its string return value will be prepended to the serialized block markup.
 * @param callable $post_callback Callback to run on each block in the tree after it is traversed and serialized.
 *                                It is called with the following arguments: &amp;$block, $parent_block, $next_block.
 *                                Its string return value will be appended to the serialized block markup.
 * @return string Serialized block markup.
 */
function traverse_and_serialize_block( $block, $pre_callback = null, $post_callback = null ) {
	$block_content = &#039;&#039;;
	$block_index   = 0;

	foreach ( $block[&#039;innerContent&#039;] as $chunk ) {
		if ( is_string( $chunk ) ) {
			$block_content .= $chunk;
		} else {
			$inner_block = $block[&#039;innerBlocks&#039;][ $block_index ];

			if ( is_callable( $pre_callback ) ) {
				$prev = 0 === $block_index
					? null
					: $block[&#039;innerBlocks&#039;][ $block_index - 1 ];

				$block_content .= call_user_func_array(
					$pre_callback,
					array( &amp;$inner_block, &amp;$block, $prev )
				);
			}

			if ( is_callable( $post_callback ) ) {
				$next = count( $block[&#039;innerBlocks&#039;] ) - 1 === $block_index
					? null
					: $block[&#039;innerBlocks&#039;][ $block_index + 1 ];

				$post_markup = call_user_func_array(
					$post_callback,
					array( &amp;$inner_block, &amp;$block, $next )
				);
			}

			$block_content .= traverse_and_serialize_block( $inner_block, $pre_callback, $post_callback );
			$block_content .= isset( $post_markup ) ? $post_markup : &#039;&#039;;

			++$block_index;
		}
	}

	if ( ! is_array( $block[&#039;attrs&#039;] ) ) {
		$block[&#039;attrs&#039;] = array();
	}

	return get_comment_delimited_block_content(
		$block[&#039;blockName&#039;],
		$block[&#039;attrs&#039;],
		$block_content
	);
}

/**
 * Replaces patterns in a block tree with their content.
 *
 * @since 6.6.0
 *
 * @param array $blocks An array blocks.
 *
 * @return array An array of blocks with patterns replaced by their content.
 */
function resolve_pattern_blocks( $blocks ) {
	static $inner_content;
	// Keep track of seen references to avoid infinite loops.
	static $seen_refs = array();
	$i                = 0;
	while ( $i &lt; count( $blocks ) ) {
		if ( &#039;core/pattern&#039; === $blocks[ $i ][&#039;blockName&#039;] ) {
			$attrs = $blocks[ $i ][&#039;attrs&#039;];

			if ( empty( $attrs[&#039;slug&#039;] ) ) {
				++$i;
				continue;
			}

			$slug = $attrs[&#039;slug&#039;];

			if ( isset( $seen_refs[ $slug ] ) ) {
				// Skip recursive patterns.
				array_splice( $blocks, $i, 1 );
				continue;
			}

			$registry = WP_Block_Patterns_Registry::get_instance();
			$pattern  = $registry-&gt;get_registered( $slug );

			// Skip unknown patterns.
			if ( ! $pattern ) {
				++$i;
				continue;
			}

			$blocks_to_insert   = parse_blocks( $pattern[&#039;content&#039;] );
			$seen_refs[ $slug ] = true;
			$prev_inner_content = $inner_content;
			$inner_content      = null;
			$blocks_to_insert   = resolve_pattern_blocks( $blocks_to_insert );
			$inner_content      = $prev_inner_content;
			unset( $seen_refs[ $slug ] );
			array_splice( $blocks, $i, 1, $blocks_to_insert );

			// If we have inner content, we need to insert nulls in the
			// inner content array, otherwise serialize_blocks will skip
			// blocks.
			if ( $inner_content ) {
				$null_indices  = array_keys( $inner_content, null, true );
				$content_index = $null_indices[ $i ];
				$nulls         = array_fill( 0, count( $blocks_to_insert ), null );
				array_splice( $inner_content, $content_index, 1, $nulls );
			}

			// Skip inserted blocks.
			$i += count( $blocks_to_insert );
		} else {
			if ( ! empty( $blocks[ $i ][&#039;innerBlocks&#039;] ) ) {
				$prev_inner_content           = $inner_content;
				$inner_content                = $blocks[ $i ][&#039;innerContent&#039;];
				$blocks[ $i ][&#039;innerBlocks&#039;]  = resolve_pattern_blocks(
					$blocks[ $i ][&#039;innerBlocks&#039;]
				);
				$blocks[ $i ][&#039;innerContent&#039;] = $inner_content;
				$inner_content                = $prev_inner_content;
			}
			++$i;
		}
	}
	return $blocks;
}

/**
 * Given an array of parsed block trees, applies callbacks before and after serializing them and
 * returns their concatenated output.
 *
 * Recursively traverses the blocks and their inner blocks and applies the two callbacks provided as
 * arguments, the first one before serializing a block, and the second one after serializing.
 * If either callback returns a string value, it will be prepended and appended to the serialized
 * block markup, respectively.
 *
 * The callbacks will receive a reference to the current block as their first argument, so that they
 * can also modify it, and the current block&#039;s parent block as second argument. Finally, the
 * `$pre_callback` receives the previous block, whereas the `$post_callback` receives
 * the next block as third argument.
 *
 * Serialized blocks are returned including comment delimiters, and with all attributes serialized.
 *
 * This function should be used when there is a need to modify the saved blocks, or to inject markup
 * into the return value. Prefer `serialize_blocks` when preparing blocks to be saved to post content.
 *
 * This function is meant for internal use only.
 *
 * @since 6.4.0
 * @access private
 *
 * @see serialize_blocks()
 *
 * @param array[]  $blocks        An array of parsed blocks. See WP_Block_Parser_Block.
 * @param callable $pre_callback  Callback to run on each block in the tree before it is traversed and serialized.
 *                                It is called with the following arguments: &amp;$block, $parent_block, $previous_block.
 *                                Its string return value will be prepended to the serialized block markup.
 * @param callable $post_callback Callback to run on each block in the tree after it is traversed and serialized.
 *                                It is called with the following arguments: &amp;$block, $parent_block, $next_block.
 *                                Its string return value will be appended to the serialized block markup.
 * @return string Serialized block markup.
 */
function traverse_and_serialize_blocks( $blocks, $pre_callback = null, $post_callback = null ) {
	$result       = &#039;&#039;;
	$parent_block = null; // At the top level, there is no parent block to pass to the callbacks; yet the callbacks expect a reference.

	foreach ( $blocks as $index =&gt; $block ) {
		if ( is_callable( $pre_callback ) ) {
			$prev = 0 === $index
				? null
				: $blocks[ $index - 1 ];

			$result .= call_user_func_array(
				$pre_callback,
				array( &amp;$block, &amp;$parent_block, $prev )
			);
		}

		if ( is_callable( $post_callback ) ) {
			$next = count( $blocks ) - 1 === $index
				? null
				: $blocks[ $index + 1 ];

			$post_markup = call_user_func_array(
				$post_callback,
				array( &amp;$block, &amp;$parent_block, $next )
			);
		}

		$result .= traverse_and_serialize_block( $block, $pre_callback, $post_callback );
		$result .= isset( $post_markup ) ? $post_markup : &#039;&#039;;
	}

	return $result;
}

/**
 * Filters and sanitizes block content to remove non-allowable HTML
 * from parsed block attribute values.
 *
 * @since 5.3.1
 *
 * @param string         $text              Text that may contain block content.
 * @param array[]|string $allowed_html      Optional. An array of allowed HTML elements and attributes,
 *                                          or a context name such as &#039;post&#039;. See wp_kses_allowed_html()
 *                                          for the list of accepted context names. Default &#039;post&#039;.
 * @param string[]       $allowed_protocols Optional. Array of allowed URL protocols.
 *                                          Defaults to the result of wp_allowed_protocols().
 * @return string The filtered and sanitized content result.
 */
function filter_block_content( $text, $allowed_html = &#039;post&#039;, $allowed_protocols = array() ) {
	$result = &#039;&#039;;

	if ( str_contains( $text, &#039;&lt;!--&#039; ) &amp;&amp; str_contains( $text, &#039;---&gt;&#039; ) ) {
		$text = preg_replace_callback( &#039;%&lt;!--(.*?)---&gt;%&#039;, &#039;_filter_block_content_callback&#039;, $text );
	}

	$blocks = parse_blocks( $text );
	foreach ( $blocks as $block ) {
		$block   = filter_block_kses( $block, $allowed_html, $allowed_protocols );
		$result .= serialize_block( $block );
	}

	return $result;
}

/**
 * Callback used for regular expression replacement in filter_block_content().
 *
 * @since 6.2.1
 * @access private
 *
 * @param array $matches Array of preg_replace_callback matches.
 * @return string Replacement string.
 */
function _filter_block_content_callback( $matches ) {
	return &#039;&lt;!--&#039; . rtrim( $matches[1], &#039;-&#039; ) . &#039;--&gt;&#039;;
}

/**
 * Filters and sanitizes a parsed block to remove non-allowable HTML
 * from block attribute values.
 *
 * @since 5.3.1
 *
 * @param WP_Block_Parser_Block $block             The parsed block object.
 * @param array[]|string        $allowed_html      An array of allowed HTML elements and attributes,
 *                                                 or a context name such as &#039;post&#039;. See wp_kses_allowed_html()
 *                                                 for the list of accepted context names.
 * @param string[]              $allowed_protocols Optional. Array of allowed URL protocols.
 *                                                 Defaults to the result of wp_allowed_protocols().
 * @return array The filtered and sanitized block object result.
 */
function filter_block_kses( $block, $allowed_html, $allowed_protocols = array() ) {
	$block[&#039;attrs&#039;] = filter_block_kses_value( $block[&#039;attrs&#039;], $allowed_html, $allowed_protocols, $block );

	if ( is_array( $block[&#039;innerBlocks&#039;] ) ) {
		foreach ( $block[&#039;innerBlocks&#039;] as $i =&gt; $inner_block ) {
			$block[&#039;innerBlocks&#039;][ $i ] = filter_block_kses( $inner_block, $allowed_html, $allowed_protocols );
		}
	}

	return $block;
}

/**
 * Filters and sanitizes a parsed block attribute value to remove
 * non-allowable HTML.
 *
 * @since 5.3.1
 * @since 6.5.5 Added the `$block_context` parameter.
 *
 * @param string[]|string $value             The attribute value to filter.
 * @param array[]|string  $allowed_html      An array of allowed HTML elements and attributes,
 *                                           or a context name such as &#039;post&#039;. See wp_kses_allowed_html()
 *                                           for the list of accepted context names.
 * @param string[]        $allowed_protocols Optional. Array of allowed URL protocols.
 *                                           Defaults to the result of wp_allowed_protocols().
 * @param array           $block_context     Optional. The block the attribute belongs to, in parsed block array format.
 * @return string[]|string The filtered and sanitized result.
 */
function filter_block_kses_value( $value, $allowed_html, $allowed_protocols = array(), $block_context = null ) {
	if ( is_array( $value ) ) {
		foreach ( $value as $key =&gt; $inner_value ) {
			$filtered_key   = filter_block_kses_value( $key, $allowed_html, $allowed_protocols, $block_context );
			$filtered_value = filter_block_kses_value( $inner_value, $allowed_html, $allowed_protocols, $block_context );

			if ( isset( $block_context[&#039;blockName&#039;] ) &amp;&amp; &#039;core/template-part&#039; === $block_context[&#039;blockName&#039;] ) {
				$filtered_value = filter_block_core_template_part_attributes( $filtered_value, $filtered_key, $allowed_html );
			}
			if ( $filtered_key !== $key ) {
				unset( $value[ $key ] );
			}

			$value[ $filtered_key ] = $filtered_value;
		}
	} elseif ( is_string( $value ) ) {
		return wp_kses( $value, $allowed_html, $allowed_protocols );
	}

	return $value;
}

/**
 * Sanitizes the value of the Template Part block&#039;s `tagName` attribute.
 *
 * @since 6.5.5
 *
 * @param string         $attribute_value The attribute value to filter.
 * @param string         $attribute_name  The attribute name.
 * @param array[]|string $allowed_html    An array of allowed HTML elements and attributes,
 *                                        or a context name such as &#039;post&#039;. See wp_kses_allowed_html()
 *                                        for the list of accepted context names.
 * @return string The sanitized attribute value.
 */
function filter_block_core_template_part_attributes( $attribute_value, $attribute_name, $allowed_html ) {
	if ( empty( $attribute_value ) || &#039;tagName&#039; !== $attribute_name ) {
		return $attribute_value;
	}
	if ( ! is_array( $allowed_html ) ) {
		$allowed_html = wp_kses_allowed_html( $allowed_html );
	}
	return isset( $allowed_html[ $attribute_value ] ) ? $attribute_value : &#039;&#039;;
}

/**
 * Parses blocks out of a content string, and renders those appropriate for the excerpt.
 *
 * As the excerpt should be a small string of text relevant to the full post content,
 * this function renders the blocks that are most likely to contain such text.
 *
 * @since 5.0.0
 *
 * @param string $content The content to parse.
 * @return string The parsed and filtered content.
 */
function excerpt_remove_blocks( $content ) {
	if ( ! has_blocks( $content ) ) {
		return $content;
	}

	$allowed_inner_blocks = array(
		// Classic blocks have their blockName set to null.
		null,
		&#039;core/freeform&#039;,
		&#039;core/heading&#039;,
		&#039;core/html&#039;,
		&#039;core/list&#039;,
		&#039;core/media-text&#039;,
		&#039;core/paragraph&#039;,
		&#039;core/preformatted&#039;,
		&#039;core/pullquote&#039;,
		&#039;core/quote&#039;,
		&#039;core/table&#039;,
		&#039;core/verse&#039;,
	);

	$allowed_wrapper_blocks = array(
		&#039;core/columns&#039;,
		&#039;core/column&#039;,
		&#039;core/group&#039;,
	);

	/**
	 * Filters the list of blocks that can be used as wrapper blocks, allowing
	 * excerpts to be generated from the `innerBlocks` of these wrappers.
	 *
	 * @since 5.8.0
	 *
	 * @param string[] $allowed_wrapper_blocks The list of names of allowed wrapper blocks.
	 */
	$allowed_wrapper_blocks = apply_filters( &#039;excerpt_allowed_wrapper_blocks&#039;, $allowed_wrapper_blocks );

	$allowed_blocks = array_merge( $allowed_inner_blocks, $allowed_wrapper_blocks );

	/**
	 * Filters the list of blocks that can contribute to the excerpt.
	 *
	 * If a dynamic block is added to this list, it must not generate another
	 * excerpt, as this will cause an infinite loop to occur.
	 *
	 * @since 5.0.0
	 *
	 * @param string[] $allowed_blocks The list of names of allowed blocks.
	 */
	$allowed_blocks = apply_filters( &#039;excerpt_allowed_blocks&#039;, $allowed_blocks );
	$blocks         = parse_blocks( $content );
	$output         = &#039;&#039;;

	foreach ( $blocks as $block ) {
		if ( in_array( $block[&#039;blockName&#039;], $allowed_blocks, true ) ) {
			if ( ! empty( $block[&#039;innerBlocks&#039;] ) ) {
				if ( in_array( $block[&#039;blockName&#039;], $allowed_wrapper_blocks, true ) ) {
					$output .= _excerpt_render_inner_blocks( $block, $allowed_blocks );
					continue;
				}

				// Skip the block if it has disallowed or nested inner blocks.
				foreach ( $block[&#039;innerBlocks&#039;] as $inner_block ) {
					if (
						! in_array( $inner_block[&#039;blockName&#039;], $allowed_inner_blocks, true ) ||
						! empty( $inner_block[&#039;innerBlocks&#039;] )
					) {
						continue 2;
					}
				}
			}

			$output .= render_block( $block );
		}
	}

	return $output;
}

/**
 * Parses footnotes markup out of a content string,
 * and renders those appropriate for the excerpt.
 *
 * @since 6.3.0
 *
 * @param string $content The content to parse.
 * @return string The parsed and filtered content.
 */
function excerpt_remove_footnotes( $content ) {
	if ( ! str_contains( $content, &#039;data-fn=&#039; ) ) {
		return $content;
	}

	return preg_replace(
		&#039;_&lt;sup data-fn=&quot;[^&quot;]+&quot; class=&quot;[^&quot;]+&quot;&gt;\s*&lt;a href=&quot;[^&quot;]+&quot; id=&quot;[^&quot;]+&quot;&gt;\d+&lt;/a&gt;\s*&lt;/sup&gt;_&#039;,
		&#039;&#039;,
		$content
	);
}

/**
 * Renders inner blocks from the allowed wrapper blocks
 * for generating an excerpt.
 *
 * @since 5.8.0
 * @access private
 *
 * @param array $parsed_block   The parsed block.
 * @param array $allowed_blocks The list of allowed inner blocks.
 * @return string The rendered inner blocks.
 */
function _excerpt_render_inner_blocks( $parsed_block, $allowed_blocks ) {
	$output = &#039;&#039;;

	foreach ( $parsed_block[&#039;innerBlocks&#039;] as $inner_block ) {
		if ( ! in_array( $inner_block[&#039;blockName&#039;], $allowed_blocks, true ) ) {
			continue;
		}

		if ( empty( $inner_block[&#039;innerBlocks&#039;] ) ) {
			$output .= render_block( $inner_block );
		} else {
			$output .= _excerpt_render_inner_blocks( $inner_block, $allowed_blocks );
		}
	}

	return $output;
}

/**
 * Renders a single block into a HTML string.
 *
 * @since 5.0.0
 *
 * @global WP_Post $post The post to edit.
 *
 * @param array $parsed_block {
 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
 *
 *     @type string   $blockName    Name of block.
 *     @type array    $attrs        Attributes from block comment delimiters.
 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                  have the same structure as this one.
 *     @type string   $innerHTML    HTML from inside block comment delimiters.
 *     @type array    $innerContent List of string fragments and null markers where
 *                                  inner blocks were found.
 * }
 * @return string String of rendered HTML.
 */
function render_block( $parsed_block ) {
	global $post;
	$parent_block = null;

	/**
	 * Allows render_block() to be short-circuited, by returning a non-null value.
	 *
	 * @since 5.1.0
	 * @since 5.9.0 The `$parent_block` parameter was added.
	 *
	 * @param string|null   $pre_render   The pre-rendered content. Default null.
	 * @param array         $parsed_block {
	 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
	 */
	$pre_render = apply_filters( &#039;pre_render_block&#039;, null, $parsed_block, $parent_block );
	if ( ! is_null( $pre_render ) ) {
		return $pre_render;
	}

	$source_block = $parsed_block;

	/**
	 * Filters the block being rendered in render_block(), before it&#039;s processed.
	 *
	 * @since 5.1.0
	 * @since 5.9.0 The `$parent_block` parameter was added.
	 *
	 * @param array         $parsed_block {
	 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param array         $source_block {
	 *     An un-modified copy of `$parsed_block`, as it appeared in the source content.
	 *     See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
	 */
	$parsed_block = apply_filters( &#039;render_block_data&#039;, $parsed_block, $source_block, $parent_block );

	$context = array();

	if ( $post instanceof WP_Post ) {
		$context[&#039;postId&#039;] = $post-&gt;ID;

		/*
		 * The `postType` context is largely unnecessary server-side, since the ID
		 * is usually sufficient on its own. That being said, since a block&#039;s
		 * manifest is expected to be shared between the server and the client,
		 * it should be included to consistently fulfill the expectation.
		 */
		$context[&#039;postType&#039;] = $post-&gt;post_type;
	}

	/**
	 * Filters the default context provided to a rendered block.
	 *
	 * @since 5.5.0
	 * @since 5.9.0 The `$parent_block` parameter was added.
	 *
	 * @param array         $context      Default context.
	 * @param array         $parsed_block {
	 *     A representative array of the block being rendered. See WP_Block_Parser_Block.
	 *
	 *     @type string   $blockName    Name of block.
	 *     @type array    $attrs        Attributes from block comment delimiters.
	 *     @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
	 *                                  have the same structure as this one.
	 *     @type string   $innerHTML    HTML from inside block comment delimiters.
	 *     @type array    $innerContent List of string fragments and null markers where
	 *                                  inner blocks were found.
	 * }
	 * @param WP_Block|null $parent_block If this is a nested block, a reference to the parent block.
	 */
	$context = apply_filters( &#039;render_block_context&#039;, $context, $parsed_block, $parent_block );

	$block = new WP_Block( $parsed_block, $context );

	return $block-&gt;render();
}

/**
 * Parses blocks out of a content string.
 *
 * @since 5.0.0
 *
 * @param string $content Post content.
 * @return array[] {
 *     Array of block structures.
 *
 *     @type array ...$0 {
 *         A representative array of a single parsed block object. See WP_Block_Parser_Block.
 *
 *         @type string   $blockName    Name of block.
 *         @type array    $attrs        Attributes from block comment delimiters.
 *         @type array[]  $innerBlocks  List of inner blocks. An array of arrays that
 *                                      have the same structure as this one.
 *         @type string   $innerHTML    HTML from inside block comment delimiters.
 *         @type array    $innerContent List of string fragments and null markers where
 *                                      inner blocks were found.
 *     }
 * }
 */
function parse_blocks( $content ) {
	/**
	 * Filter to allow plugins to replace the server-side block parser.
	 *
	 * @since 5.0.0
	 *
	 * @param string $parser_class Name of block parser class.
	 */
	$parser_class = apply_filters( &#039;block_parser_class&#039;, &#039;WP_Block_Parser&#039; );

	$parser = new $parser_class();
	return $parser-&gt;parse( $content );
}

/**
 * Parses dynamic blocks out of `post_content` and re-renders them.
 *
 * @since 5.0.0
 *
 * @param string $content Post content.
 * @return string Updated post content.
 */
function do_blocks( $content ) {
	$blocks = parse_blocks( $content );
	$output = &#039;&#039;;

	foreach ( $blocks as $block ) {
		$output .= render_block( $block );
	}

	// If there are blocks in this content, we shouldn&#039;t run wpautop() on it later.
	$priority = has_filter( &#039;the_content&#039;, &#039;wpautop&#039; );
	if ( false !== $priority &amp;&amp; doing_filter( &#039;the_content&#039; ) &amp;&amp; has_blocks( $content ) ) {
		remove_filter( &#039;the_content&#039;, &#039;wpautop&#039;, $priority );
		add_filter( &#039;the_content&#039;, &#039;_restore_wpautop_hook&#039;, $priority + 1 );
	}

	return $output;
}

/**
 * If do_blocks() needs to remove wpautop() from the `the_content` filter, this re-adds it afterwards,
 * for subsequent `the_content` usage.
 *
 * @since 5.0.0
 * @access private
 *
 * @param string $content The post content running through this filter.
 * @return string The unmodified content.
 */
function _restore_wpautop_hook( $content ) {
	$current_priority = has_filter( &#039;the_content&#039;, &#039;_restore_wpautop_hook&#039; );

	add_filter( &#039;the_content&#039;, &#039;wpautop&#039;, $current_priority - 1 );
	remove_filter( &#039;the_content&#039;, &#039;_restore_wpautop_hook&#039;, $current_priority );

	return $content;
}

/**
 * Returns the current version of the block format that the content string is using.
 *
 * If the string doesn&#039;t contain blocks, it returns 0.
 *
 * @since 5.0.0
 *
 * @param string $content Content to test.
 * @return int The block format version is 1 if the content contains one or more blocks, 0 otherwise.
 */
function block_version( $content ) {
	return has_blocks( $content ) ? 1 : 0;
}

/**
 * Registers a new block style.
 *
 * @since 5.3.0
 * @since 6.6.0 Added support for registering styles for multiple block types.
 *
 * @link https://developer.wordpress.org/block-editor/reference-guides/block-api/block-styles/
 *
 * @param string|string[] $block_name       Block type name including namespace or array of namespaced block type names.
 * @param array           $style_properties Array containing the properties of the style name, label,
 *                                          style_handle (name of the stylesheet to be enqueued),
 *                                          inline_style (string containing the CSS to be added),
 *                                          style_data (theme.json-like array to generate CSS from).
 *                                          See WP_Block_Styles_Registry::register().
 * @return bool True if the block style was registered with success and false otherwise.
 */
function register_block_style( $block_name, $style_properties ) {
	return WP_Block_Styles_Registry::get_instance()-&gt;register( $block_name, $style_properties );
}

/**
 * Unregisters a block style.
 *
 * @since 5.3.0
 *
 * @param string $block_name       Block type name including namespace.
 * @param string $block_style_name Block style name.
 * @return bool True if the block style was unregistered with success and false otherwise.
 */
function unregister_block_style( $block_name, $block_style_name ) {
	return WP_Block_Styles_Registry::get_instance()-&gt;unregister( $block_name, $block_style_name );
}

/**
 * Checks whether the current block type supports the feature requested.
 *
 * @since 5.8.0
 * @since 6.4.0 The `$feature` parameter now supports a string.
 *
 * @param WP_Block_Type $block_type    Block type to check for support.
 * @param string|array  $feature       Feature slug, or path to a specific feature to check support for.
 * @param mixed         $default_value Optional. Fallback value for feature support. Default false.
 * @return bool Whether the feature is supported.
 */
function block_has_support( $block_type, $feature, $default_value = false ) {
	$block_support = $default_value;
	if ( $block_type instanceof WP_Block_Type ) {
		if ( is_array( $feature ) &amp;&amp; count( $feature ) === 1 ) {
			$feature = $feature[0];
		}

		if ( is_array( $feature ) ) {
			$block_support = _wp_array_get( $block_type-&gt;supports, $feature, $default_value );
		} elseif ( isset( $block_type-&gt;supports[ $feature ] ) ) {
			$block_support = $block_type-&gt;supports[ $feature ];
		}
	}

	return true === $block_support || is_array( $block_support );
}

/**
 * Converts typography keys declared under `supports.*` to `supports.typography.*`.
 *
 * Displays a `_doing_it_wrong()` notice when a block using the older format is detected.
 *
 * @since 5.8.0
 *
 * @param array $metadata Metadata for registering a block type.
 * @return array Filtered metadata for registering a block type.
 */
function wp_migrate_old_typography_shape( $metadata ) {
	if ( ! isset( $metadata[&#039;supports&#039;] ) ) {
		return $metadata;
	}

	$typography_keys = array(
		&#039;__experimentalFontFamily&#039;,
		&#039;__experimentalFontStyle&#039;,
		&#039;__experimentalFontWeight&#039;,
		&#039;__experimentalLetterSpacing&#039;,
		&#039;__experimentalTextDecoration&#039;,
		&#039;__experimentalTextTransform&#039;,
		&#039;fontSize&#039;,
		&#039;lineHeight&#039;,
	);

	foreach ( $typography_keys as $typography_key ) {
		$support_for_key = isset( $metadata[&#039;supports&#039;][ $typography_key ] ) ? $metadata[&#039;supports&#039;][ $typography_key ] : null;

		if ( null !== $support_for_key ) {
			_doing_it_wrong(
				&#039;register_block_type_from_metadata()&#039;,
				sprintf(
					/* translators: 1: Block type, 2: Typography supports key, e.g: fontSize, lineHeight, etc. 3: block.json, 4: Old metadata key, 5: New metadata key. */
					__( &#039;Block &quot;%1$s&quot; is declaring %2$s support in %3$s file under %4$s. %2$s support is now declared under %5$s.&#039; ),
					$metadata[&#039;name&#039;],
					&quot;&lt;code&gt;$typography_key&lt;/code&gt;&quot;,
					&#039;&lt;code&gt;block.json&lt;/code&gt;&#039;,
					&quot;&lt;code&gt;supports.$typography_key&lt;/code&gt;&quot;,
					&quot;&lt;code&gt;supports.typography.$typography_key&lt;/code&gt;&quot;
				),
				&#039;5.8.0&#039;
			);

			_wp_array_set( $metadata[&#039;supports&#039;], array( &#039;typography&#039;, $typography_key ), $support_for_key );
			unset( $metadata[&#039;supports&#039;][ $typography_key ] );
		}
	}

	return $metadata;
}

/**
 * Helper function that constructs a WP_Query args array from
 * a `Query` block properties.
 *
 * It&#039;s used in Query Loop, Query Pagination Numbers and Query Pagination Next blocks.
 *
 * @since 5.8.0
 * @since 6.1.0 Added `query_loop_block_query_vars` filter and `parents` support in query.
 *
 * @param WP_Block $block Block instance.
 * @param int      $page  Current query&#039;s page.
 *
 * @return array Returns the constructed WP_Query arguments.
 */
function build_query_vars_from_query_block( $block, $page ) {
	$query = array(
		&#039;post_type&#039;    =&gt; &#039;post&#039;,
		&#039;order&#039;        =&gt; &#039;DESC&#039;,
		&#039;orderby&#039;      =&gt; &#039;date&#039;,
		&#039;post__not_in&#039; =&gt; array(),
	);

	if ( isset( $block-&gt;context[&#039;query&#039;] ) ) {
		if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;postType&#039;] ) ) {
			$post_type_param = $block-&gt;context[&#039;query&#039;][&#039;postType&#039;];
			if ( is_post_type_viewable( $post_type_param ) ) {
				$query[&#039;post_type&#039;] = $post_type_param;
			}
		}
		if ( isset( $block-&gt;context[&#039;query&#039;][&#039;sticky&#039;] ) &amp;&amp; ! empty( $block-&gt;context[&#039;query&#039;][&#039;sticky&#039;] ) ) {
			$sticky = get_option( &#039;sticky_posts&#039; );
			if ( &#039;only&#039; === $block-&gt;context[&#039;query&#039;][&#039;sticky&#039;] ) {
				/*
				 * Passing an empty array to post__in will return have_posts() as true (and all posts will be returned).
				 * Logic should be used before hand to determine if WP_Query should be used in the event that the array
				 * being passed to post__in is empty.
				 *
				 * @see https://core.trac.wordpress.org/ticket/28099
				 */
				$query[&#039;post__in&#039;]            = ! empty( $sticky ) ? $sticky : array( 0 );
				$query[&#039;ignore_sticky_posts&#039;] = 1;
			} else {
				$query[&#039;post__not_in&#039;] = array_merge( $query[&#039;post__not_in&#039;], $sticky );
			}
		}
		if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;exclude&#039;] ) ) {
			$excluded_post_ids     = array_map( &#039;intval&#039;, $block-&gt;context[&#039;query&#039;][&#039;exclude&#039;] );
			$excluded_post_ids     = array_filter( $excluded_post_ids );
			$query[&#039;post__not_in&#039;] = array_merge( $query[&#039;post__not_in&#039;], $excluded_post_ids );
		}
		if (
			isset( $block-&gt;context[&#039;query&#039;][&#039;perPage&#039;] ) &amp;&amp;
			is_numeric( $block-&gt;context[&#039;query&#039;][&#039;perPage&#039;] )
		) {
			$per_page = absint( $block-&gt;context[&#039;query&#039;][&#039;perPage&#039;] );
			$offset   = 0;

			if (
				isset( $block-&gt;context[&#039;query&#039;][&#039;offset&#039;] ) &amp;&amp;
				is_numeric( $block-&gt;context[&#039;query&#039;][&#039;offset&#039;] )
			) {
				$offset = absint( $block-&gt;context[&#039;query&#039;][&#039;offset&#039;] );
			}

			$query[&#039;offset&#039;]         = ( $per_page * ( $page - 1 ) ) + $offset;
			$query[&#039;posts_per_page&#039;] = $per_page;
		}
		// Migrate `categoryIds` and `tagIds` to `tax_query` for backwards compatibility.
		if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;categoryIds&#039;] ) || ! empty( $block-&gt;context[&#039;query&#039;][&#039;tagIds&#039;] ) ) {
			$tax_query = array();
			if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;categoryIds&#039;] ) ) {
				$tax_query[] = array(
					&#039;taxonomy&#039;         =&gt; &#039;category&#039;,
					&#039;terms&#039;            =&gt; array_filter( array_map( &#039;intval&#039;, $block-&gt;context[&#039;query&#039;][&#039;categoryIds&#039;] ) ),
					&#039;include_children&#039; =&gt; false,
				);
			}
			if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;tagIds&#039;] ) ) {
				$tax_query[] = array(
					&#039;taxonomy&#039;         =&gt; &#039;post_tag&#039;,
					&#039;terms&#039;            =&gt; array_filter( array_map( &#039;intval&#039;, $block-&gt;context[&#039;query&#039;][&#039;tagIds&#039;] ) ),
					&#039;include_children&#039; =&gt; false,
				);
			}
			$query[&#039;tax_query&#039;] = $tax_query;
		}
		if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;taxQuery&#039;] ) ) {
			$query[&#039;tax_query&#039;] = array();
			foreach ( $block-&gt;context[&#039;query&#039;][&#039;taxQuery&#039;] as $taxonomy =&gt; $terms ) {
				if ( is_taxonomy_viewable( $taxonomy ) &amp;&amp; ! empty( $terms ) ) {
					$query[&#039;tax_query&#039;][] = array(
						&#039;taxonomy&#039;         =&gt; $taxonomy,
						&#039;terms&#039;            =&gt; array_filter( array_map( &#039;intval&#039;, $terms ) ),
						&#039;include_children&#039; =&gt; false,
					);
				}
			}
		}
		if (
			isset( $block-&gt;context[&#039;query&#039;][&#039;order&#039;] ) &amp;&amp;
				in_array( strtoupper( $block-&gt;context[&#039;query&#039;][&#039;order&#039;] ), array( &#039;ASC&#039;, &#039;DESC&#039; ), true )
		) {
			$query[&#039;order&#039;] = strtoupper( $block-&gt;context[&#039;query&#039;][&#039;order&#039;] );
		}
		if ( isset( $block-&gt;context[&#039;query&#039;][&#039;orderBy&#039;] ) ) {
			$query[&#039;orderby&#039;] = $block-&gt;context[&#039;query&#039;][&#039;orderBy&#039;];
		}
		if (
			isset( $block-&gt;context[&#039;query&#039;][&#039;author&#039;] )
		) {
			if ( is_array( $block-&gt;context[&#039;query&#039;][&#039;author&#039;] ) ) {
				$query[&#039;author__in&#039;] = array_filter( array_map( &#039;intval&#039;, $block-&gt;context[&#039;query&#039;][&#039;author&#039;] ) );
			} elseif ( is_string( $block-&gt;context[&#039;query&#039;][&#039;author&#039;] ) ) {
				$query[&#039;author__in&#039;] = array_filter( array_map( &#039;intval&#039;, explode( &#039;,&#039;, $block-&gt;context[&#039;query&#039;][&#039;author&#039;] ) ) );
			} elseif ( is_int( $block-&gt;context[&#039;query&#039;][&#039;author&#039;] ) &amp;&amp; $block-&gt;context[&#039;query&#039;][&#039;author&#039;] &gt; 0 ) {
				$query[&#039;author&#039;] = $block-&gt;context[&#039;query&#039;][&#039;author&#039;];
			}
		}
		if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;search&#039;] ) ) {
			$query[&#039;s&#039;] = $block-&gt;context[&#039;query&#039;][&#039;search&#039;];
		}
		if ( ! empty( $block-&gt;context[&#039;query&#039;][&#039;parents&#039;] ) &amp;&amp; is_post_type_hierarchical( $query[&#039;post_type&#039;] ) ) {
			$query[&#039;post_parent__in&#039;] = array_filter( array_map( &#039;intval&#039;, $block-&gt;context[&#039;query&#039;][&#039;parents&#039;] ) );
		}
	}

	/**
	 * Filters the arguments which will be passed to `WP_Query` for the Query Loop Block.
	 *
	 * Anything to this filter should be compatible with the `WP_Query` API to form
	 * the query context which will be passed down to the Query Loop Block&#039;s children.
	 * This can help, for example, to include additional settings or meta queries not
	 * directly supported by the core Query Loop Block, and extend its capabilities.
	 *
	 * Please note that this will only influence the query that will be rendered on the
	 * front-end. The editor preview is not affected by this filter. Also, worth noting
	 * that the editor preview uses the REST API, so, ideally, one should aim to provide
	 * attributes which are also compatible with the REST API, in order to be able to
	 * implement identical queries on both sides.
	 *
	 * @since 6.1.0
	 *
	 * @param array    $query Array containing parameters for `WP_Query` as parsed by the block context.
	 * @param WP_Block $block Block instance.
	 * @param int      $page  Current query&#039;s page.
	 */
	return apply_filters( &#039;query_loop_block_query_vars&#039;, $query, $block, $page );
}

/**
 * Helper function that returns the proper pagination arrow HTML for
 * `QueryPaginationNext` and `QueryPaginationPrevious` blocks based
 * on the provided `paginationArrow` from `QueryPagination` context.
 *
 * It&#039;s used in QueryPaginationNext and QueryPaginationPrevious blocks.
 *
 * @since 5.9.0
 *
 * @param WP_Block $block   Block instance.
 * @param bool     $is_next Flag for handling `next/previous` blocks.
 * @return string|null The pagination arrow HTML or null if there is none.
 */
function get_query_pagination_arrow( $block, $is_next ) {
	$arrow_map = array(
		&#039;none&#039;    =&gt; &#039;&#039;,
		&#039;arrow&#039;   =&gt; array(
			&#039;next&#039;     =&gt; &#039;→&#039;,
			&#039;previous&#039; =&gt; &#039;←&#039;,
		),
		&#039;chevron&#039; =&gt; array(
			&#039;next&#039;     =&gt; &#039;»&#039;,
			&#039;previous&#039; =&gt; &#039;«&#039;,
		),
	);
	if ( ! empty( $block-&gt;context[&#039;paginationArrow&#039;] ) &amp;&amp; array_key_exists( $block-&gt;context[&#039;paginationArrow&#039;], $arrow_map ) &amp;&amp; ! empty( $arrow_map[ $block-&gt;context[&#039;paginationArrow&#039;] ] ) ) {
		$pagination_type = $is_next ? &#039;next&#039; : &#039;previous&#039;;
		$arrow_attribute = $block-&gt;context[&#039;paginationArrow&#039;];
		$arrow           = $arrow_map[ $block-&gt;context[&#039;paginationArrow&#039;] ][ $pagination_type ];
		$arrow_classes   = &quot;wp-block-query-pagination-$pagination_type-arrow is-arrow-$arrow_attribute&quot;;
		return &quot;&lt;span class=&#039;$arrow_classes&#039; aria-hidden=&#039;true&#039;&gt;$arrow&lt;/span&gt;&quot;;
	}
	return null;
}

/**
 * Helper function that constructs a comment query vars array from the passed
 * block properties.
 *
 * It&#039;s used with the Comment Query Loop inner blocks.
 *
 * @since 6.0.0
 *
 * @param WP_Block $block Block instance.
 * @return array Returns the comment query parameters to use with the
 *               WP_Comment_Query constructor.
 */
function build_comment_query_vars_from_block( $block ) {

	$comment_args = array(
		&#039;orderby&#039;       =&gt; &#039;comment_date_gmt&#039;,
		&#039;order&#039;         =&gt; &#039;ASC&#039;,
		&#039;status&#039;        =&gt; &#039;approve&#039;,
		&#039;no_found_rows&#039; =&gt; false,
	);

	if ( is_user_logged_in() ) {
		$comment_args[&#039;include_unapproved&#039;] = array( get_current_user_id() );
	} else {
		$unapproved_email = wp_get_unapproved_comment_author_email();

		if ( $unapproved_email ) {
			$comment_args[&#039;include_unapproved&#039;] = array( $unapproved_email );
		}
	}

	if ( ! empty( $block-&gt;context[&#039;postId&#039;] ) ) {
		$comment_args[&#039;post_id&#039;] = (int) $block-&gt;context[&#039;postId&#039;];
	}

	if ( get_option( &#039;thread_comments&#039; ) ) {
		$comment_args[&#039;hierarchical&#039;] = &#039;threaded&#039;;
	} else {
		$comment_args[&#039;hierarchical&#039;] = false;
	}

	if ( get_option( &#039;page_comments&#039; ) === &#039;1&#039; || get_option( &#039;page_comments&#039; ) === true ) {
		$per_page     = get_option( &#039;comments_per_page&#039; );
		$default_page = get_option( &#039;default_comments_page&#039; );
		if ( $per_page &gt; 0 ) {
			$comment_args[&#039;number&#039;] = $per_page;

			$page = (int) get_query_var( &#039;cpage&#039; );
			if ( $page ) {
				$comment_args[&#039;paged&#039;] = $page;
			} elseif ( &#039;oldest&#039; === $default_page ) {
				$comment_args[&#039;paged&#039;] = 1;
			} elseif ( &#039;newest&#039; === $default_page ) {
				$max_num_pages = (int) ( new WP_Comment_Query( $comment_args ) )-&gt;max_num_pages;
				if ( 0 !== $max_num_pages ) {
					$comment_args[&#039;paged&#039;] = $max_num_pages;
				}
			}
			// Set the `cpage` query var to ensure the previous and next pagination links are correct
			// when inheriting the Discussion Settings.
			if ( 0 === $page &amp;&amp; isset( $comment_args[&#039;paged&#039;] ) &amp;&amp; $comment_args[&#039;paged&#039;] &gt; 0 ) {
				set_query_var( &#039;cpage&#039;, $comment_args[&#039;paged&#039;] );
			}
		}
	}

	return $comment_args;
}

/**
 * Helper function that returns the proper pagination arrow HTML for
 * `CommentsPaginationNext` and `CommentsPaginationPrevious` blocks based on the
 * provided `paginationArrow` from `CommentsPagination` context.
 *
 * It&#039;s used in CommentsPaginationNext and CommentsPaginationPrevious blocks.
 *
 * @since 6.0.0
 *
 * @param WP_Block $block           Block instance.
 * @param string   $pagination_type Optional. Type of the arrow we will be rendering.
 *                                  Accepts &#039;next&#039; or &#039;previous&#039;. Default &#039;next&#039;.
 * @return string|null The pagination arrow HTML or null if there is none.
 */
function get_comments_pagination_arrow( $block, $pagination_type = &#039;next&#039; ) {
	$arrow_map = array(
		&#039;none&#039;    =&gt; &#039;&#039;,
		&#039;arrow&#039;   =&gt; array(
			&#039;next&#039;     =&gt; &#039;→&#039;,
			&#039;previous&#039; =&gt; &#039;←&#039;,
		),
		&#039;chevron&#039; =&gt; array(
			&#039;next&#039;     =&gt; &#039;»&#039;,
			&#039;previous&#039; =&gt; &#039;«&#039;,
		),
	);
	if ( ! empty( $block-&gt;context[&#039;comments/paginationArrow&#039;] ) &amp;&amp; ! empty( $arrow_map[ $block-&gt;context[&#039;comments/paginationArrow&#039;] ][ $pagination_type ] ) ) {
		$arrow_attribute = $block-&gt;context[&#039;comments/paginationArrow&#039;];
		$arrow           = $arrow_map[ $block-&gt;context[&#039;comments/paginationArrow&#039;] ][ $pagination_type ];
		$arrow_classes   = &quot;wp-block-comments-pagination-$pagination_type-arrow is-arrow-$arrow_attribute&quot;;
		return &quot;&lt;span class=&#039;$arrow_classes&#039; aria-hidden=&#039;true&#039;&gt;$arrow&lt;/span&gt;&quot;;
	}
	return null;
}

/**
 * Strips all HTML from the content of footnotes, and sanitizes the ID.
 *
 * This function expects slashed data on the footnotes content.
 *
 * @access private
 * @since 6.3.2
 *
 * @param string $footnotes JSON-encoded string of an array containing the content and ID of each footnote.
 * @return string Filtered content without any HTML on the footnote content and with the sanitized ID.
 */
function _wp_filter_post_meta_footnotes( $footnotes ) {
	$footnotes_decoded = json_decode( $footnotes, true );
	if ( ! is_array( $footnotes_decoded ) ) {
		return &#039;&#039;;
	}
	$footnotes_sanitized = array();
	foreach ( $footnotes_decoded as $footnote ) {
		if ( ! empty( $footnote[&#039;content&#039;] ) &amp;&amp; ! empty( $footnote[&#039;id&#039;] ) ) {
			$footnotes_sanitized[] = array(
				&#039;id&#039;      =&gt; sanitize_key( $footnote[&#039;id&#039;] ),
				&#039;content&#039; =&gt; wp_unslash( wp_filter_post_kses( wp_slash( $footnote[&#039;content&#039;] ) ) ),
			);
		}
	}
	return wp_json_encode( $footnotes_sanitized );
}

/**
 * Adds the filters for footnotes meta field.
 *
 * @access private
 * @since 6.3.2
 */
function _wp_footnotes_kses_init_filters() {
	add_filter( &#039;sanitize_post_meta_footnotes&#039;, &#039;_wp_filter_post_meta_footnotes&#039; );
}

/**
 * Removes the filters for footnotes meta field.
 *
 * @access private
 * @since 6.3.2
 */
function _wp_footnotes_remove_filters() {
	remove_filter( &#039;sanitize_post_meta_footnotes&#039;, &#039;_wp_filter_post_meta_footnotes&#039; );
}

/**
 * Registers the filter of footnotes meta field if the user does not have `unfiltered_html` capability.
 *
 * @access private
 * @since 6.3.2
 */
function _wp_footnotes_kses_init() {
	_wp_footnotes_remove_filters();
	if ( ! current_user_can( &#039;unfiltered_html&#039; ) ) {
		_wp_footnotes_kses_init_filters();
	}
}

/**
 * Initializes the filters for footnotes meta field when imported data should be filtered.
 *
 * This filter is the last one being executed on {@see &#039;force_filtered_html_on_import&#039;}.
 * If the input of the filter is true, it means we are in an import situation and should
 * enable kses, independently of the user capabilities. So in that case we call
 * _wp_footnotes_kses_init_filters().
 *
 * @access private
 * @since 6.3.2
 *
 * @param string $arg Input argument of the filter.
 * @return string Input argument of the filter.
 */
function _wp_footnotes_force_filtered_html_on_import_filter( $arg ) {
	// If `force_filtered_html_on_import` is true, we need to init the global styles kses filters.
	if ( $arg ) {
		_wp_footnotes_kses_init_filters();
	}
	return $arg;
}
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