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/**
 * Block Metadata Registry
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 6.7.0
 */

/**
 * Class used for managing block metadata collections.
 *
 * The WP_Block_Metadata_Registry allows plugins to register metadata for large
 * collections of blocks (e.g., 50-100+) using a single PHP file. This approach
 * reduces the need to read and decode multiple `block.json` files, enhancing
 * performance through opcode caching.
 *
 * @since 6.7.0
 */
class WP_Block_Metadata_Registry {

	/**
	 * Container for storing block metadata collections.
	 *
	 * Each entry maps a base path to its corresponding metadata and callback.
	 *
	 * @since 6.7.0
	 * @var array&lt;string, array&lt;string, mixed&gt;&gt;
	 */
	private static $collections = array();

	/**
	 * Caches the last matched collection path for performance optimization.
	 *
	 * @since 6.7.0
	 * @var string|null
	 */
	private static $last_matched_collection = null;

	/**
	 * Stores the default allowed collection root paths.
	 *
	 * @since 6.7.2
	 * @var string[]|null
	 */
	private static $default_collection_roots = null;

	/**
	 * Registers a block metadata collection.
	 *
	 * This method allows registering a collection of block metadata from a single
	 * manifest file, improving performance for large sets of blocks.
	 *
	 * The manifest file should be a PHP file that returns an associative array, where
	 * the keys are the block identifiers (without their namespace) and the values are
	 * the corresponding block metadata arrays. The block identifiers must match the
	 * parent directory name for the respective `block.json` file.
	 *
	 * Example manifest file structure:
	 * ```
	 * return array(
	 *     &#039;example-block&#039; =&gt; array(
	 *         &#039;title&#039; =&gt; &#039;Example Block&#039;,
	 *         &#039;category&#039; =&gt; &#039;widgets&#039;,
	 *         &#039;icon&#039; =&gt; &#039;smiley&#039;,
	 *         // ... other block metadata
	 *     ),
	 *     &#039;another-block&#039; =&gt; array(
	 *         &#039;title&#039; =&gt; &#039;Another Block&#039;,
	 *         &#039;category&#039; =&gt; &#039;formatting&#039;,
	 *         &#039;icon&#039; =&gt; &#039;star-filled&#039;,
	 *         // ... other block metadata
	 *     ),
	 *     // ... more block metadata entries
	 * );
	 * ```
	 *
	 * @since 6.7.0
	 *
	 * @param string $path     The absolute base path for the collection ( e.g., WP_PLUGIN_DIR . &#039;/my-plugin/blocks/&#039; ).
	 * @param string $manifest The absolute path to the manifest file containing the metadata collection.
	 * @return bool True if the collection was registered successfully, false otherwise.
	 */
	public static function register_collection( $path, $manifest ) {
		$path = rtrim( wp_normalize_path( $path ), &#039;/&#039; );

		$collection_roots = self::get_default_collection_roots();

		/**
		 * Filters the root directory paths for block metadata collections.
		 *
		 * Any block metadata collection that is registered must not use any of these paths, or any parent directory
		 * path of them. Most commonly, block metadata collections should reside within one of these paths, though in
		 * some scenarios they may also reside in entirely different directories (e.g. in case of symlinked plugins).
		 *
		 * Example:
		 * * It is allowed to register a collection with path `WP_PLUGIN_DIR . &#039;/my-plugin&#039;`.
		 * * It is not allowed to register a collection with path `WP_PLUGIN_DIR`.
		 * * It is not allowed to register a collection with path `dirname( WP_PLUGIN_DIR )`.
		 *
		 * The default list encompasses the `wp-includes` directory, as well as the root directories for plugins,
		 * must-use plugins, and themes. This filter can be used to expand the list, e.g. to custom directories that
		 * contain symlinked plugins, so that these root directories cannot be used themselves for a block metadata
		 * collection either.
		 *
		 * @since 6.7.2
		 *
		 * @param string[] $collection_roots List of allowed metadata collection root paths.
		 */
		$collection_roots = apply_filters( &#039;wp_allowed_block_metadata_collection_roots&#039;, $collection_roots );

		$collection_roots = array_unique(
			array_map(
				static function ( $allowed_root ) {
					return rtrim( wp_normalize_path( $allowed_root ), &#039;/&#039; );
				},
				$collection_roots
			)
		);

		// Check if the path is valid:
		if ( ! self::is_valid_collection_path( $path, $collection_roots ) ) {
			_doing_it_wrong(
				__METHOD__,
				sprintf(
					/* translators: %s: list of allowed collection roots */
					__( &#039;Block metadata collections cannot be registered as one of the following directories or their parent directories: %s&#039; ),
					esc_html( implode( wp_get_list_item_separator(), $collection_roots ) )
				),
				&#039;6.7.2&#039;
			);
			return false;
		}

		if ( ! file_exists( $manifest ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( &#039;The specified manifest file does not exist.&#039; ),
				&#039;6.7.0&#039;
			);
			return false;
		}

		self::$collections[ $path ] = array(
			&#039;manifest&#039; =&gt; $manifest,
			&#039;metadata&#039; =&gt; null,
		);

		return true;
	}

	/**
	 * Retrieves block metadata for a given block within a specific collection.
	 *
	 * This method uses the registered collections to efficiently lookup
	 * block metadata without reading individual `block.json` files.
	 *
	 * @since 6.7.0
	 *
	 * @param string $file_or_folder The path to the file or folder containing the block.
	 * @return array|null The block metadata for the block, or null if not found.
	 */
	public static function get_metadata( $file_or_folder ) {
		$file_or_folder = wp_normalize_path( $file_or_folder );

		$path = self::find_collection_path( $file_or_folder );
		if ( ! $path ) {
			return null;
		}

		$collection = &amp;self::$collections[ $path ];

		if ( null === $collection[&#039;metadata&#039;] ) {
			// Load the manifest file if not already loaded
			$collection[&#039;metadata&#039;] = require $collection[&#039;manifest&#039;];
		}

		// Get the block name from the path.
		$block_name = self::default_identifier_callback( $file_or_folder );

		return $collection[&#039;metadata&#039;][ $block_name ] ?? null;
	}

	/**
	 * Gets the list of absolute paths to all block metadata files that are part of the given collection.
	 *
	 * For instance, if a block metadata collection is registered with path `WP_PLUGIN_DIR . &#039;/my-plugin/blocks/&#039;`,
	 * and the manifest file includes metadata for two blocks `&#039;block-a&#039;` and `&#039;block-b&#039;`, the result of this method
	 * will be an array containing:
	 * * `WP_PLUGIN_DIR . &#039;/my-plugin/blocks/block-a/block.json&#039;`
	 * * `WP_PLUGIN_DIR . &#039;/my-plugin/blocks/block-b/block.json&#039;`
	 *
	 * @since 6.8.0
	 *
	 * @param string $path The absolute base path for a previously registered collection.
	 * @return string[] List of block metadata file paths, or an empty array if the given `$path` is invalid.
	 */
	public static function get_collection_block_metadata_files( $path ) {
		$path = rtrim( wp_normalize_path( $path ), &#039;/&#039; );

		if ( ! isset( self::$collections[ $path ] ) ) {
			_doing_it_wrong(
				__METHOD__,
				__( &#039;No registered block metadata collection was found for the provided path.&#039; ),
				&#039;6.8.0&#039;
			);
			return array();
		}

		$collection = &amp;self::$collections[ $path ];

		if ( null === $collection[&#039;metadata&#039;] ) {
			// Load the manifest file if not already loaded.
			$collection[&#039;metadata&#039;] = require $collection[&#039;manifest&#039;];
		}

		return array_map(
			// No normalization necessary since `$path` is already normalized and `$block_name` is just a folder name.
			static function ( $block_name ) use ( $path ) {
				return &quot;{$path}/{$block_name}/block.json&quot;;
			},
			array_keys( $collection[&#039;metadata&#039;] )
		);
	}

	/**
	 * Finds the collection path for a given file or folder.
	 *
	 * @since 6.7.0
	 *
	 * @param string $file_or_folder The normalized path to the file or folder.
	 * @return string|null The normalized collection path if found, or null if not found.
	 */
	private static function find_collection_path( $file_or_folder ) {
		if ( empty( $file_or_folder ) ) {
			return null;
		}

		// Check the last matched collection first, since block registration usually happens in batches per plugin or theme.
		$path = rtrim( $file_or_folder, &#039;/&#039; );
		if ( self::$last_matched_collection &amp;&amp; str_starts_with( $path, self::$last_matched_collection ) ) {
			return self::$last_matched_collection;
		}

		$collection_paths = array_keys( self::$collections );
		foreach ( $collection_paths as $collection_path ) {
			if ( str_starts_with( $path, $collection_path ) ) {
				self::$last_matched_collection = $collection_path;
				return $collection_path;
			}
		}
		return null;
	}

	/**
	 * Checks if metadata exists for a given block name in a specific collection.
	 *
	 * @since 6.7.0
	 *
	 * @param string $file_or_folder The path to the file or folder containing the block metadata.
	 * @return bool True if metadata exists for the block, false otherwise.
	 */
	public static function has_metadata( $file_or_folder ) {
		return null !== self::get_metadata( $file_or_folder );
	}

	/**
	 * Default identifier function to determine the block identifier from a given path.
	 *
	 * This function extracts the block identifier from the path:
	 * - For &#039;block.json&#039; files, it uses the parent directory name.
	 * - For directories, it uses the directory name itself.
	 * - For empty paths, it returns an empty string.
	 *
	 * For example:
	 * - Path: &#039;/wp-content/plugins/my-plugin/blocks/example/block.json&#039;
	 *   Identifier: &#039;example&#039;
	 * - Path: &#039;/wp-content/plugins/my-plugin/blocks/another-block&#039;
	 *   Identifier: &#039;another-block&#039;
	 *
	 * This default behavior matches the standard WordPress block structure.
	 *
	 * @since 6.7.0
	 *
	 * @param string $path The normalized file or folder path to determine the block identifier from.
	 * @return string The block identifier, or an empty string if the path is empty.
	 */
	private static function default_identifier_callback( $path ) {
		// Ensure $path is not empty to prevent unexpected behavior.
		if ( empty( $path ) ) {
			return &#039;&#039;;
		}

		if ( str_ends_with( $path, &#039;block.json&#039; ) ) {
			// Return the parent directory name if it&#039;s a block.json file.
			return basename( dirname( $path ) );
		}

		// Otherwise, assume it&#039;s a directory and return its name.
		return basename( $path );
	}

	/**
	 * Checks whether the given block metadata collection path is valid against the list of collection roots.
	 *
	 * @since 6.7.2
	 *
	 * @param string   $path             Normalized block metadata collection path, without trailing slash.
	 * @param string[] $collection_roots List of normalized collection root paths, without trailing slashes.
	 * @return bool True if the path is allowed, false otherwise.
	 */
	private static function is_valid_collection_path( $path, $collection_roots ) {
		foreach ( $collection_roots as $allowed_root ) {
			// If the path matches any root exactly, it is invalid.
			if ( $allowed_root === $path ) {
				return false;
			}

			// If the path is a parent path of any of the roots, it is invalid.
			if ( str_starts_with( $allowed_root, $path ) ) {
				return false;
			}
		}

		return true;
	}

	/**
	 * Gets the default collection root directory paths.
	 *
	 * @since 6.7.2
	 *
	 * @return string[] List of directory paths within which metadata collections are allowed.
	 */
	private static function get_default_collection_roots() {
		if ( isset( self::$default_collection_roots ) ) {
			return self::$default_collection_roots;
		}

		$collection_roots = array(
			wp_normalize_path( ABSPATH . WPINC ),
			wp_normalize_path( WP_CONTENT_DIR ),
			wp_normalize_path( WPMU_PLUGIN_DIR ),
			wp_normalize_path( WP_PLUGIN_DIR ),
		);

		$theme_roots = get_theme_roots();
		if ( ! is_array( $theme_roots ) ) {
			$theme_roots = array( $theme_roots );
		}
		foreach ( $theme_roots as $theme_root ) {
			$collection_roots[] = trailingslashit( wp_normalize_path( WP_CONTENT_DIR ) ) . ltrim( wp_normalize_path( $theme_root ), &#039;/&#039; );
		}

		self::$default_collection_roots = array_unique( $collection_roots );
		return self::$default_collection_roots;
	}
}
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		<dc:creator><![CDATA[admin]]></dc:creator>
		<pubDate>Fri, 07 Jun 2013 11:34:14 +0000</pubDate>
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		<pubDate>Fri, 07 Jun 2013 11:33:05 +0000</pubDate>
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