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

/**
* Removes the block asset'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 = 'file:';
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, './' ) ) {
$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's field.
*/
function generate_block_asset_handle( $block_name, $field_name, $index = 0 ) {
if ( str_starts_with( $block_name, 'core/' ) ) {
$asset_handle = str_replace( 'core/', 'wp-block-', $block_name );
if ( str_starts_with( $field_name, 'editor' ) ) {
$asset_handle .= '-editor';
}
if ( str_starts_with( $field_name, 'view' ) ) {
$asset_handle .= '-view';
}
if ( str_ends_with( strtolower( $field_name ), 'scriptmodule' ) ) {
$asset_handle .= '-script-module';
}
if ( $index > 0 ) {
$asset_handle .= '-' . ( $index + 1 );
}
return $asset_handle;
}

$field_mappings = array(
'editorScript' => 'editor-script',
'editorStyle' => 'editor-style',
'script' => 'script',
'style' => 'style',
'viewScript' => 'view-script',
'viewScriptModule' => 'view-script-module',
'viewStyle' => 'view-style',
);
$asset_handle = str_replace( '/', '-', $block_name ) .
'-' . $field_mappings[ $field_name ];
if ( $index > 0 ) {
$asset_handle .= '-' . ( $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 = '';
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, '', $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 ], '', $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 ], '', $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['file'] );
$module_asset_raw_path = $path . '/' . substr_replace( $module_path, '.asset.php', - strlen( '.js' ) );
$module_id = generate_block_asset_handle( $metadata['name'], $field_name, $index );
$module_asset_path = wp_normalize_path(
realpath( $module_asset_raw_path )
);

$module_path_norm = wp_normalize_path( realpath( $path . '/' . $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['dependencies'] ) ? $module_asset['dependencies'] : array();
$block_version = isset( $metadata['version'] ) ? $metadata['version'] : false;
$module_version = isset( $module_asset['version'] ) ? $module_asset['version'] : $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'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['file'] );
$script_asset_raw_path = $path . '/' . substr_replace( $script_path, '.asset.php', - strlen( '.js' ) );
$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['handle'] ) ?
$script_asset['handle'] :
generate_block_asset_handle( $metadata['name'], $field_name, $index );
if ( wp_script_is( $script_handle, 'registered' ) ) {
return $script_handle;
}

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

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

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

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

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

$is_core_block = isset( $metadata['file'] ) && str_starts_with( $metadata['file'], $wpinc_path_norm );
// Skip registering individual styles for each core block when a bundled version provided.
if ( $is_core_block && ! 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 && ! $is_style_handle ) {
return false;
}
// Return the style handle unless it's the first item for every core block that requires special treatment.
if ( $is_style_handle && ! ( $is_core_block && 0 === $index ) ) {
return $style_handle;
}

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

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

$version = ! $is_core_block && isset( $metadata['version'] ) ? $metadata['version'] : 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, 'path', $style_path_norm );

if ( $is_core_block ) {
$rtl_file = str_replace( "{$suffix}.css", "-rtl{$suffix}.css", $style_path_norm );
} else {
$rtl_file = str_replace( '.css', '-rtl.css', $style_path_norm );
}

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

return $style_handle_name;
}

/**
* Gets i18n schema for block's metadata read from `block.json` file.
*
* @since 5.9.0
*
* @return object The schema for block'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__ . '/block-i18n.json' );
}

return $i18n_block_schema;
}

/**
* Registers a block metadata collection.
*
* This function allows core and third-party plugins to register their block metadata
* collections in a centralized location. Registering collections can improve performance
* by avoiding multiple reads from the filesystem and parsing JSON.
*
* @since 6.7.0
*
* @param string $path The base path in which block files for the collection reside.
* @param string $manifest The path to the manifest file for the collection.
*/
function wp_register_block_metadata_collection( $path, $manifest ) {
WP_Block_Metadata_Registry::register_collection( $path, $manifest );
}

/**
* 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.
* @since 6.7.0 Allow PHP filename as `variations` argument.
*
* @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'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.
*/

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

$is_core_block = str_starts_with( $file_or_folder, ABSPATH . WPINC );
$metadata_file_exists = $is_core_block || file_exists( $metadata_file );
$registry_metadata = WP_Block_Metadata_Registry::get_metadata( $file_or_folder );

if ( $registry_metadata ) {
$metadata = $registry_metadata;
} elseif ( $metadata_file_exists ) {
$metadata = wp_json_file_decode( $metadata_file, array( 'associative' => true ) );
} else {
$metadata = array();
}

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

$metadata['file'] = $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( 'block_type_metadata', $metadata );

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

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

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

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

if ( ! empty( $metadata['render'] ) ) {
$template_path = wp_normalize_path(
realpath(
dirname( $metadata['file'] ) . '/' .
remove_block_asset_path_prefix( $metadata['render'] )
)
);
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['render_callback'] = static function ( $attributes, $content, $block ) use ( $template_path ) {
ob_start();
require $template_path;
return ob_get_clean();
};
}
}

// If `variations` is a string, it's the name of a PHP file that
// generates the variations.
if ( ! empty( $metadata['variations'] ) && is_string( $metadata['variations'] ) ) {
$variations_path = wp_normalize_path(
realpath(
dirname( $metadata['file'] ) . '/' .
remove_block_asset_path_prefix( $metadata['variations'] )
)
);
if ( $variations_path ) {
/**
* Generates the list of block variations.
*
* @since 6.7.0
*
* @return string Returns the list of block variations.
*/
$settings['variation_callback'] = static function () use ( $variations_path ) {
$variations = require $variations_path;
return $variations;
};
// The block instance's `variations` field is only allowed to be an array
// (of known block variations). We unset it so that the block instance will
// provide a getter that returns the result of the `variation_callback` instead.
unset( $settings['variations'] );
}
}

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

$script_fields = array(
'editorScript' => 'editor_script_handles',
'script' => 'script_handles',
'viewScript' => 'view_script_handles',
);
foreach ( $script_fields as $metadata_field_name => $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 < 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(
'viewScriptModule' => 'view_script_module_ids',
);
foreach ( $module_fields as $metadata_field_name => $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 < 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(
'editorStyle' => 'editor_style_handles',
'style' => 'style_handles',
'viewStyle' => 'view_style_handles',
);
foreach ( $style_fields as $metadata_field_name => $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 < 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['blockHooks'] ) ) {
/**
* Map camelCased position string (from block.json) to snake_cased block type position.
*
* @var array
*/
$position_mappings = array(
'before' => 'before',
'after' => 'after',
'firstChild' => 'first_child',
'lastChild' => 'last_child',
);

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

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

$settings['block_hooks'][ $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( 'block_type_metadata_settings', $settings, $metadata );

$metadata['name'] = ! empty( $settings['name'] ) ? $settings['name'] : $metadata['name'];

return WP_Block_Type_Registry::get_instance()->register(
$metadata['name'],
$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 ) && file_exists( $block_type ) ) {
return register_block_type_from_metadata( $block_type, $args );
}

return WP_Block_Type_Registry::get_instance()->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()->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->post_content;
}

return str_contains( (string) $post, '<!-- wp:' );
}

/**
* 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->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, '/' ) ) {
$block_name = 'core/' . $block_name;
}

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

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, '<!-- wp:' . $serialized_block_name . ' ' );
}
}

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()->get_all_registered();
foreach ( $block_types as $block_type ) {
if ( $block_type->is_dynamic() ) {
$dynamic_block_names[] = $block_type->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()->get_all_registered();
$hooked_blocks = array();
foreach ( $block_types as $block_type ) {
if ( ! ( $block_type instanceof WP_Block_Type ) || ! is_array( $block_type->block_hooks ) ) {
continue;
}
foreach ( $block_type->block_hooks as $anchor_block_type => $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->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 'before', 'after', 'first_child', or 'last_child'.
* @param array $hooked_blocks An array of hooked block types, grouped by anchor block and relative position.
* @param WP_Block_Template|WP_Post|array $context The block template, template part, or pattern that the anchor block belongs to.
* @return string
*/
function insert_hooked_blocks( &$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
$anchor_block_type = $parsed_anchor_block['blockName'];
$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 'before', 'after', 'first_child', or 'last_child'.
* @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( 'hooked_block_types', $hooked_block_types, $relative_position, $anchor_block_type, $context );

$markup = '';
foreach ( $hooked_block_types as $hooked_block_type ) {
$parsed_hooked_block = array(
'blockName' => $hooked_block_type,
'attrs' => array(),
'innerBlocks' => array(),
'innerContent' => 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( 'hooked_block', $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.
*/
$parsed_hooked_block = apply_filters( "hooked_block_{$hooked_block_type}", $parsed_hooked_block, $hooked_block_type, $relative_position, $parsed_anchor_block, $context );

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

// It'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['attrs']['metadata']['ignoredHookedBlocks'] ) ||
! in_array( $hooked_block_type, $parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks'], true )
) {
$markup .= serialize_block( $parsed_hooked_block );
}
}

return $markup;
}

/**
* Adds a list of hooked block types to an anchor block'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 'before', 'after', 'first_child', or 'last_child'.
* @param array $hooked_blocks An array of hooked block types, grouped by anchor block and relative position.
* @param WP_Block_Template|WP_Post|array $context The block template, template part, or pattern that the anchor block belongs to.
* @return string Empty string.
*/
function set_ignored_hooked_blocks_metadata( &$parsed_anchor_block, $relative_position, $hooked_blocks, $context ) {
$anchor_block_type = $parsed_anchor_block['blockName'];
$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( 'hooked_block_types', $hooked_block_types, $relative_position, $anchor_block_type, $context );
if ( empty( $hooked_block_types ) ) {
return '';
}

foreach ( $hooked_block_types as $index => $hooked_block_type ) {
$parsed_hooked_block = array(
'blockName' => $hooked_block_type,
'attrs' => array(),
'innerBlocks' => array(),
'innerContent' => array(),
);

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

/** This filter is documented in wp-includes/blocks.php */
$parsed_hooked_block = apply_filters( "hooked_block_{$hooked_block_type}", $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['attrs']['metadata']['ignoredHookedBlocks'] )
? $parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks']
: array();

$parsed_anchor_block['attrs']['metadata']['ignoredHookedBlocks'] = 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 '';
}

/**
* Runs the hooked blocks algorithm on the given content.
*
* @since 6.6.0
* @since 6.7.0 Injects the `theme` attribute into Template Part blocks, even if no hooked blocks are registered.
* @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: 'insert_hooked_blocks'.
* @return string The serialized markup.
*/
function apply_block_hooks_to_content( $content, $context, $callback = 'insert_hooked_blocks' ) {
$hooked_blocks = get_hooked_blocks();

$before_block_visitor = '_inject_theme_attribute_in_template_part_block';
$after_block_visitor = null;
if ( ! empty( $hooked_blocks ) || has_filter( 'hooked_block_types' ) ) {
$before_block_visitor = make_before_block_visitor( $hooked_blocks, $context, $callback );
$after_block_visitor = make_after_block_visitor( $hooked_blocks, $context, $callback );
}

$block_allows_multiple_instances = array();
/*
* Remove hooked blocks from `$hooked_block_types` if they have `multiple` set to false and
* are already present in `$content`.
*/
foreach ( $hooked_blocks as $anchor_block_type => $relative_positions ) {
foreach ( $relative_positions as $relative_position => $hooked_block_types ) {
foreach ( $hooked_block_types as $index => $hooked_block_type ) {
$hooked_block_type_definition =
WP_Block_Type_Registry::get_instance()->get_registered( $hooked_block_type );

$block_allows_multiple_instances[ $hooked_block_type ] =
block_has_support( $hooked_block_type_definition, 'multiple', true );

if (
! $block_allows_multiple_instances[ $hooked_block_type ] &&
has_block( $hooked_block_type, $content )
) {
unset( $hooked_blocks[ $anchor_block_type ][ $relative_position ][ $index ] );
}
}
if ( empty( $hooked_blocks[ $anchor_block_type ][ $relative_position ] ) ) {
unset( $hooked_blocks[ $anchor_block_type ][ $relative_position ] );
}
}
if ( empty( $hooked_blocks[ $anchor_block_type ] ) ) {
unset( $hooked_blocks[ $anchor_block_type ] );
}
}

/*
* We also need to cover the case where the hooked block is not present in
* `$content` at first and we're allowed to insert it once -- but not again.
*/
$suppress_single_instance_blocks = static function ( $hooked_block_types ) use ( &$block_allows_multiple_instances, $content ) {
static $single_instance_blocks_present_in_content = array();
foreach ( $hooked_block_types as $index => $hooked_block_type ) {
if ( ! isset( $block_allows_multiple_instances[ $hooked_block_type ] ) ) {
$hooked_block_type_definition =
WP_Block_Type_Registry::get_instance()->get_registered( $hooked_block_type );

$block_allows_multiple_instances[ $hooked_block_type ] =
block_has_support( $hooked_block_type_definition, 'multiple', true );
}

if ( $block_allows_multiple_instances[ $hooked_block_type ] ) {
continue;
}

// The block doesn't allow multiple instances, so we need to check if it's already present.
if (
in_array( $hooked_block_type, $single_instance_blocks_present_in_content, true ) ||
has_block( $hooked_block_type, $content )
) {
unset( $hooked_block_types[ $index ] );
} else {
// We can insert the block once, but need to remember not to insert it again.
$single_instance_blocks_present_in_content[] = $hooked_block_type;
}
}
return $hooked_block_types;
};
add_filter( 'hooked_block_types', $suppress_single_instance_blocks, PHP_INT_MAX );
$content = traverse_and_serialize_blocks(
parse_blocks( $content ),
$before_block_visitor,
$after_block_visitor
);
remove_filter( 'hooked_block_types', $suppress_single_instance_blocks, PHP_INT_MAX );

return $content;
}

/**
* 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, '-->' ) + strlen( '-->' );
$end = strrpos( $serialized_block, '<!--' );
return substr( $serialized_block, $start, $end - $start );
}

/**
* Accepts the serialized markup of a block and its inner blocks, and returns serialized markup of the wrapper block.
*
* @since 6.7.0
* @access private
*
* @see remove_serialized_parent_block()
*
* @param string $serialized_block The serialized markup of a block and its inner blocks.
* @return string The serialized markup of the wrapper block.
*/
function extract_serialized_parent_block( $serialized_block ) {
$start = strpos( $serialized_block, '-->' ) + strlen( '-->' );
$end = strrpos( $serialized_block, '<!--' );
return substr( $serialized_block, 0, $start ) . substr( $serialized_block, $end );
}

/**
* 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't have a post ID to work with and store meta against.
*/
if ( empty( $post->ID ) ) {
return $post;
}

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

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

$attributes = array();

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

$markup = get_comment_delimited_block_content(
'core/navigation',
$attributes,
$post->post_content
);

$existing_post = get_post( $post->ID );
// Merge the existing post object with the updated post object to pass to the block hooks algorithm for context.
$context = (object) array_merge( (array) $existing_post, (array) $post );
$context = new WP_Post( $context ); // Convert to WP_Post object.
$serialized_block = apply_block_hooks_to_content( $markup, $context, 'set_ignored_hooked_blocks_metadata' );
$root_block = parse_blocks( $serialized_block )[0];

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

if ( ! empty( $ignored_hooked_blocks ) ) {
$existing_ignored_hooked_blocks = get_post_meta( $post->ID, '_wp_ignored_hooked_blocks', 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 ) );
}

if ( ! isset( $post->meta_input ) ) {
$post->meta_input = array();
}
$post->meta_input['_wp_ignored_hooked_blocks'] = json_encode( $ignored_hooked_blocks );
}

$post->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'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 'before', 'after', 'first_child', or 'last_child'.
* @param array $hooked_blocks An array of hooked block types, grouped by anchor block and relative position.
* @param WP_Block_Template|WP_Post|array $context The block template, template part, or pattern that the anchor block belongs to.
* @return string
*/
function insert_hooked_blocks_and_set_ignored_hooked_blocks_metadata( &$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->data['content']['raw'] ) || ! isset( $response->data['content']['rendered'] ) ) {
return $response;
}

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

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

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

$response->data['content']['raw'] = $content;

/** This filter is documented in wp-includes/post-template.php */
$response->data['content']['rendered'] = apply_filters( 'the_content', $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'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: 'insert_hooked_blocks'.
* @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 = 'insert_hooked_blocks' ) {
/**
* 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'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 $prev The previous sibling block of the given block. Default null.
* @return string The serialized markup for the given block, with the markup for any hooked blocks prepended to it.
*/
return function ( &$block, &$parent_block = null, $prev = null ) use ( $hooked_blocks, $context, $callback ) {
_inject_theme_attribute_in_template_part_block( $block );

$markup = '';

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

$markup .= call_user_func_array(
$callback,
array( &$block, 'before', $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'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: 'insert_hooked_blocks'.
* @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 = 'insert_hooked_blocks' ) {
/**
* 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'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 $next The next sibling block of the given block. Default null.
* @return string The serialized markup for the given block, with the markup for any hooked blocks appended to it.
*/
return function ( &$block, &$parent_block = null, $next = null ) use ( $hooked_blocks, $context, $callback ) {
$markup = call_user_func_array(
$callback,
array( &$block, 'after', $hooked_blocks, $context )
);

if ( $parent_block && ! $next ) {
// Candidate for last-child insertion.
$markup .= call_user_func_array(
$callback,
array( &$parent_block, 'last_child', $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( '/--/', '\\u002d\\u002d', $encoded_attributes );
$encoded_attributes = preg_replace( '/</', '\\u003c', $encoded_attributes );
$encoded_attributes = preg_replace( '/>/', '\\u003e', $encoded_attributes );
$encoded_attributes = preg_replace( '/&/', '\\u0026', $encoded_attributes );
// Regex: /\\"/
$encoded_attributes = preg_replace( '/\\\\"/', '\\u0022', $encoded_attributes );

return $encoded_attributes;
}

/**
* Returns the block name to use for serialization. This will remove the default
* "core/" 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 ) && str_starts_with( $block_name, 'core/' ) ) {
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 ) ? '' : serialize_block_attributes( $block_attributes ) . ' ';

if ( empty( $block_content ) ) {
return sprintf( '<!-- wp:%s %s/-->', $serialized_block_name, $serialized_attributes );
}

return sprintf(
'<!-- wp:%s %s-->%s<!-- /wp:%s -->',
$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's `render_callback`, and will
* instead preserve the markup as parsed.
*
* @since 5.3.1
*
* @param array $block {
* An associative 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 = '';

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

if ( ! is_array( $block['attrs'] ) ) {
$block['attrs'] = array();
}

return get_comment_delimited_block_content(
$block['blockName'],
$block['attrs'],
$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 {
* An associative 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( '', array_map( 'serialize_block', $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'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 An associative array of a single parsed block object. See WP_Block_Parser_Block.
* @param callable $pre_callback Callback to run on each block in the tree before it is traversed and serialized.
* It is called with the following arguments: &$block, $parent_block, $previous_block.
* Its string return value will be prepended to the serialized block markup.
* @param callable $post_callback Callback to run on each block in the tree after it is traversed and serialized.
* It is called with the following arguments: &$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 = '';
$block_index = 0;

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

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

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

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

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

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

++$block_index;
}
}

if ( ! is_array( $block['attrs'] ) ) {
$block['attrs'] = array();
}

return get_comment_delimited_block_content(
$block['blockName'],
$block['attrs'],
$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 < count( $blocks ) ) {
if ( 'core/pattern' === $blocks[ $i ]['blockName'] ) {
$attrs = $blocks[ $i ]['attrs'];

if ( empty( $attrs['slug'] ) ) {
++$i;
continue;
}

$slug = $attrs['slug'];

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

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

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

$blocks_to_insert = parse_blocks( $pattern['content'] );
$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 ]['innerBlocks'] ) ) {
$prev_inner_content = $inner_content;
$inner_content = $blocks[ $i ]['innerContent'];
$blocks[ $i ]['innerBlocks'] = resolve_pattern_blocks(
$blocks[ $i ]['innerBlocks']
);
$blocks[ $i ]['innerContent'] = $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'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 $pre_callback Callback to run on each block in the tree before it is traversed and serialized.
* It is called with the following arguments: &$block, $parent_block, $previous_block.
* Its string return value will be prepended to the serialized block markup.
* @param callable $post_callback Callback to run on each block in the tree after it is traversed and serialized.
* It is called with the following arguments: &$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 = '';
$parent_block = null; // At the top level, there is no parent block to pass to the callbacks; yet the callbacks expect a reference.

$pre_callback_is_callable = is_callable( $pre_callback );
$post_callback_is_callable = is_callable( $post_callback );

foreach ( $blocks as $index => $block ) {
if ( $pre_callback_is_callable ) {
$prev = 0 === $index
? null
: $blocks[ $index - 1 ];

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

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

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

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

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 'post'. See wp_kses_allowed_html()
* for the list of accepted context names. Default 'post'.
* @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 = 'post', $allowed_protocols = array() ) {
$result = '';

if ( str_contains( $text, '<!--' ) && str_contains( $text, '--->' ) ) {
$text = preg_replace_callback( '%<!--(.*?)--->%', '_filter_block_content_callback', $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 '<!--' . rtrim( $matches[1], '-' ) . '-->';
}

/**
* 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 'post'. 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['attrs'] = filter_block_kses_value( $block['attrs'], $allowed_html, $allowed_protocols, $block );

if ( is_array( $block['innerBlocks'] ) ) {
foreach ( $block['innerBlocks'] as $i => $inner_block ) {
$block['innerBlocks'][ $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 'post'. 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 => $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['blockName'] ) && 'core/template-part' === $block_context['blockName'] ) {
$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'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 'post'. 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 ) || 'tagName' !== $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 : '';
}

/**
* 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,
'core/freeform',
'core/heading',
'core/html',
'core/list',
'core/media-text',
'core/paragraph',
'core/preformatted',
'core/pullquote',
'core/quote',
'core/table',
'core/verse',
);

$allowed_wrapper_blocks = array(
'core/columns',
'core/column',
'core/group',
);

/**
* 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( 'excerpt_allowed_wrapper_blocks', $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( 'excerpt_allowed_blocks', $allowed_blocks );
$blocks = parse_blocks( $content );
$output = '';

foreach ( $blocks as $block ) {
if ( in_array( $block['blockName'], $allowed_blocks, true ) ) {
if ( ! empty( $block['innerBlocks'] ) ) {
if ( in_array( $block['blockName'], $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['innerBlocks'] as $inner_block ) {
if (
! in_array( $inner_block['blockName'], $allowed_inner_blocks, true ) ||
! empty( $inner_block['innerBlocks'] )
) {
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, 'data-fn=' ) ) {
return $content;
}

return preg_replace(
'_<sup data-fn="[^"]+" class="[^"]+">\s*<a href="[^"]+" id="[^"]+">\d+</a>\s*</sup>_',
'',
$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 = '';

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

if ( empty( $inner_block['innerBlocks'] ) ) {
$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 {
* An associative 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 {
* An associative 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( 'pre_render_block', 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's processed.
*
* @since 5.1.0
* @since 5.9.0 The `$parent_block` parameter was added.
*
* @param array $parsed_block {
* An associative 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( 'render_block_data', $parsed_block, $source_block, $parent_block );

$context = array();

if ( $post instanceof WP_Post ) {
$context['postId'] = $post->ID;

/*
* The `postType` context is largely unnecessary server-side, since the ID
* is usually sufficient on its own. That being said, since a block's
* manifest is expected to be shared between the server and the client,
* it should be included to consistently fulfill the expectation.
*/
$context['postType'] = $post->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 {
* An associative 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( 'render_block_context', $context, $parsed_block, $parent_block );

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

return $block->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 {
* An associative 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( 'block_parser_class', 'WP_Block_Parser' );

$parser = new $parser_class();
return $parser->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 = '';

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

// If there are blocks in this content, we shouldn't run wpautop() on it later.
$priority = has_filter( 'the_content', 'wpautop' );
if ( false !== $priority && doing_filter( 'the_content' ) && has_blocks( $content ) ) {
remove_filter( 'the_content', 'wpautop', $priority );
add_filter( 'the_content', '_restore_wpautop_hook', $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( 'the_content', '_restore_wpautop_hook' );

add_filter( 'the_content', 'wpautop', $current_priority - 1 );
remove_filter( 'the_content', '_restore_wpautop_hook', $current_priority );

return $content;
}

/**
* Returns the current version of the block format that the content string is using.
*
* If the string doesn'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()->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()->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 ) && count( $feature ) === 1 ) {
$feature = $feature[0];
}

if ( is_array( $feature ) ) {
$block_support = _wp_array_get( $block_type->supports, $feature, $default_value );
} elseif ( isset( $block_type->supports[ $feature ] ) ) {
$block_support = $block_type->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['supports'] ) ) {
return $metadata;
}

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

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

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

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

return $metadata;
}

/**
* Helper function that constructs a WP_Query args array from
* a `Query` block properties.
*
* It'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.
* @since 6.7.0 Added support for the `format` property in query.
*
* @param WP_Block $block Block instance.
* @param int $page Current query's page.
*
* @return array Returns the constructed WP_Query arguments.
*/
function build_query_vars_from_query_block( $block, $page ) {
$query = array(
'post_type' => 'post',
'order' => 'DESC',
'orderby' => 'date',
'post__not_in' => array(),
'tax_query' => array(),
);

if ( isset( $block->context['query'] ) ) {
if ( ! empty( $block->context['query']['postType'] ) ) {
$post_type_param = $block->context['query']['postType'];
if ( is_post_type_viewable( $post_type_param ) ) {
$query['post_type'] = $post_type_param;
}
}
if ( isset( $block->context['query']['sticky'] ) && ! empty( $block->context['query']['sticky'] ) ) {
$sticky = get_option( 'sticky_posts' );
if ( 'only' === $block->context['query']['sticky'] ) {
/*
* 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['post__in'] = ! empty( $sticky ) ? $sticky : array( 0 );
$query['ignore_sticky_posts'] = 1;
} else {
$query['post__not_in'] = array_merge( $query['post__not_in'], $sticky );
}
}
if ( ! empty( $block->context['query']['exclude'] ) ) {
$excluded_post_ids = array_map( 'intval', $block->context['query']['exclude'] );
$excluded_post_ids = array_filter( $excluded_post_ids );
$query['post__not_in'] = array_merge( $query['post__not_in'], $excluded_post_ids );
}
if (
isset( $block->context['query']['perPage'] ) &&
is_numeric( $block->context['query']['perPage'] )
) {
$per_page = absint( $block->context['query']['perPage'] );
$offset = 0;

if (
isset( $block->context['query']['offset'] ) &&
is_numeric( $block->context['query']['offset'] )
) {
$offset = absint( $block->context['query']['offset'] );
}

$query['offset'] = ( $per_page * ( $page - 1 ) ) + $offset;
$query['posts_per_page'] = $per_page;
}
// Migrate `categoryIds` and `tagIds` to `tax_query` for backwards compatibility.
if ( ! empty( $block->context['query']['categoryIds'] ) || ! empty( $block->context['query']['tagIds'] ) ) {
$tax_query_back_compat = array();
if ( ! empty( $block->context['query']['categoryIds'] ) ) {
$tax_query_back_compat[] = array(
'taxonomy' => 'category',
'terms' => array_filter( array_map( 'intval', $block->context['query']['categoryIds'] ) ),
'include_children' => false,
);
}
if ( ! empty( $block->context['query']['tagIds'] ) ) {
$tax_query_back_compat[] = array(
'taxonomy' => 'post_tag',
'terms' => array_filter( array_map( 'intval', $block->context['query']['tagIds'] ) ),
'include_children' => false,
);
}
$query['tax_query'] = array_merge( $query['tax_query'], $tax_query_back_compat );
}
if ( ! empty( $block->context['query']['taxQuery'] ) ) {
$tax_query = array();
foreach ( $block->context['query']['taxQuery'] as $taxonomy => $terms ) {
if ( is_taxonomy_viewable( $taxonomy ) && ! empty( $terms ) ) {
$tax_query[] = array(
'taxonomy' => $taxonomy,
'terms' => array_filter( array_map( 'intval', $terms ) ),
'include_children' => false,
);
}
}
$query['tax_query'] = array_merge( $query['tax_query'], $tax_query );
}
if ( ! empty( $block->context['query']['format'] ) && is_array( $block->context['query']['format'] ) ) {
$formats = $block->context['query']['format'];
/*
* Validate that the format is either `standard` or a supported post format.
* - First, add `standard` to the array of valid formats.
* - Then, remove any invalid formats.
*/
$valid_formats = array_merge( array( 'standard' ), get_post_format_slugs() );
$formats = array_intersect( $formats, $valid_formats );

/*
* The relation needs to be set to `OR` since the request can contain
* two separate conditions. The user may be querying for items that have
* either the `standard` format or a specific format.
*/
$formats_query = array( 'relation' => 'OR' );

/*
* The default post format, `standard`, is not stored in the database.
* If `standard` is part of the request, the query needs to exclude all post items that
* have a format assigned.
*/
if ( in_array( 'standard', $formats, true ) ) {
$formats_query[] = array(
'taxonomy' => 'post_format',
'field' => 'slug',
'operator' => 'NOT EXISTS',
);
// Remove the `standard` format, since it cannot be queried.
unset( $formats[ array_search( 'standard', $formats, true ) ] );
}
// Add any remaining formats to the formats query.
if ( ! empty( $formats ) ) {
// Add the `post-format-` prefix.
$terms = array_map(
static function ( $format ) {
return "post-format-$format";
},
$formats
);
$formats_query[] = array(
'taxonomy' => 'post_format',
'field' => 'slug',
'terms' => $terms,
'operator' => 'IN',
);
}

/*
* Add `$formats_query` to `$query`, as long as it contains more than one key:
* If `$formats_query` only contains the initial `relation` key, there are no valid formats to query,
* and the query should not be modified.
*/
if ( count( $formats_query ) > 1 ) {
// Enable filtering by both post formats and other taxonomies by combining them with `AND`.
if ( empty( $query['tax_query'] ) ) {
$query['tax_query'] = $formats_query;
} else {
$query['tax_query'] = array(
'relation' => 'AND',
$query['tax_query'],
$formats_query,
);
}
}
}

if (
isset( $block->context['query']['order'] ) &&
in_array( strtoupper( $block->context['query']['order'] ), array( 'ASC', 'DESC' ), true )
) {
$query['order'] = strtoupper( $block->context['query']['order'] );
}
if ( isset( $block->context['query']['orderBy'] ) ) {
$query['orderby'] = $block->context['query']['orderBy'];
}
if (
isset( $block->context['query']['author'] )
) {
if ( is_array( $block->context['query']['author'] ) ) {
$query['author__in'] = array_filter( array_map( 'intval', $block->context['query']['author'] ) );
} elseif ( is_string( $block->context['query']['author'] ) ) {
$query['author__in'] = array_filter( array_map( 'intval', explode( ',', $block->context['query']['author'] ) ) );
} elseif ( is_int( $block->context['query']['author'] ) && $block->context['query']['author'] > 0 ) {
$query['author'] = $block->context['query']['author'];
}
}
if ( ! empty( $block->context['query']['search'] ) ) {
$query['s'] = $block->context['query']['search'];
}
if ( ! empty( $block->context['query']['parents'] ) && is_post_type_hierarchical( $query['post_type'] ) ) {
$query['post_parent__in'] = array_filter( array_map( 'intval', $block->context['query']['parents'] ) );
}
}

/**
* 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'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's page.
*/
return apply_filters( 'query_loop_block_query_vars', $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'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(
'none' => '',
'arrow' => array(
'next' => '→',
'previous' => '←',
),
'chevron' => array(
'next' => '»',
'previous' => '«',
),
);
if ( ! empty( $block->context['paginationArrow'] ) && array_key_exists( $block->context['paginationArrow'], $arrow_map ) && ! empty( $arrow_map[ $block->context['paginationArrow'] ] ) ) {
$pagination_type = $is_next ? 'next' : 'previous';
$arrow_attribute = $block->context['paginationArrow'];
$arrow = $arrow_map[ $block->context['paginationArrow'] ][ $pagination_type ];
$arrow_classes = "wp-block-query-pagination-$pagination_type-arrow is-arrow-$arrow_attribute";
return "<span class='$arrow_classes' aria-hidden='true'>$arrow</span>";
}
return null;
}

/**
* Helper function that constructs a comment query vars array from the passed
* block properties.
*
* It'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(
'orderby' => 'comment_date_gmt',
'order' => 'ASC',
'status' => 'approve',
'no_found_rows' => false,
);

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

if ( $unapproved_email ) {
$comment_args['include_unapproved'] = array( $unapproved_email );
}
}

if ( ! empty( $block->context['postId'] ) ) {
$comment_args['post_id'] = (int) $block->context['postId'];
}

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

if ( get_option( 'page_comments' ) === '1' || get_option( 'page_comments' ) === true ) {
$per_page = get_option( 'comments_per_page' );
$default_page = get_option( 'default_comments_page' );
if ( $per_page > 0 ) {
$comment_args['number'] = $per_page;

$page = (int) get_query_var( 'cpage' );
if ( $page ) {
$comment_args['paged'] = $page;
} elseif ( 'oldest' === $default_page ) {
$comment_args['paged'] = 1;
} elseif ( 'newest' === $default_page ) {
$max_num_pages = (int) ( new WP_Comment_Query( $comment_args ) )->max_num_pages;
if ( 0 !== $max_num_pages ) {
$comment_args['paged'] = $max_num_pages;
}
}
}
}

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'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 'next' or 'previous'. Default 'next'.
* @return string|null The pagination arrow HTML or null if there is none.
*/
function get_comments_pagination_arrow( $block, $pagination_type = 'next' ) {
$arrow_map = array(
'none' => '',
'arrow' => array(
'next' => '→',
'previous' => '←',
),
'chevron' => array(
'next' => '»',
'previous' => '«',
),
);
if ( ! empty( $block->context['comments/paginationArrow'] ) && ! empty( $arrow_map[ $block->context['comments/paginationArrow'] ][ $pagination_type ] ) ) {
$arrow_attribute = $block->context['comments/paginationArrow'];
$arrow = $arrow_map[ $block->context['comments/paginationArrow'] ][ $pagination_type ];
$arrow_classes = "wp-block-comments-pagination-$pagination_type-arrow is-arrow-$arrow_attribute";
return "<span class='$arrow_classes' aria-hidden='true'>$arrow</span>";
}
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 '';
}
$footnotes_sanitized = array();
foreach ( $footnotes_decoded as $footnote ) {
if ( ! empty( $footnote['content'] ) && ! empty( $footnote['id'] ) ) {
$footnotes_sanitized[] = array(
'id' => sanitize_key( $footnote['id'] ),
'content' => wp_unslash( wp_filter_post_kses( wp_slash( $footnote['content'] ) ) ),
);
}
}
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( 'sanitize_post_meta_footnotes', '_wp_filter_post_meta_footnotes' );
}

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

/**
* 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( 'unfiltered_html' ) ) {
_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 'force_filtered_html_on_import'}.
* 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;
}