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blocks.php
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<?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.
*
* @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 ( $index > 0 ) {
$asset_handle .= '-' . ( $index + 1 );
}
return $asset_handle;
}
$field_mappings = array(
'editorScript' => 'editor-script',
'script' => 'script',
'viewScript' => 'view-script',
'editorStyle' => 'editor-style',
'style' => 'style',
);
$asset_handle = str_replace( '/', '-', $block_name ) .
'-' . $field_mappings[ $field_name ];
if ( $index > 0 ) {
$asset_handle .= '-' . ( $index + 1 );
}
return $asset_handle;
}
/**
* Finds a script handle for the selected block metadata field. It detects
* when a path to file was provided and finds a corresponding asset file
* with details necessary to register the script under automatically
* generated handle name. It returns unprocessed script handle otherwise.
*
* @since 5.5.0
* @since 6.1.0 Added `$index` parameter.
*
* @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 = $metadata[ $field_name ];
if ( is_array( $script_handle ) ) {
if ( empty( $script_handle[ $index ] ) ) {
return false;
}
$script_handle = $script_handle[ $index ];
}
$script_path = remove_block_asset_path_prefix( $script_handle );
if ( $script_handle === $script_path ) {
return $script_handle;
}
$script_asset_raw_path = dirname( $metadata['file'] ) . '/' . substr_replace( $script_path, '.asset.php', - strlen( '.js' ) );
$script_handle = generate_block_asset_handle( $metadata['name'], $field_name, $index );
$script_asset_path = wp_normalize_path(
realpath( $script_asset_raw_path )
);
if ( empty( $script_asset_path ) ) {
_doing_it_wrong(
__FUNCTION__,
sprintf(
/* translators: 1: Asset file location, 2: Field name, 3: Block name. */
__( 'The asset file (%1$s) for the "%2$s" defined in "%3$s" block definition is missing.' ),
$script_asset_raw_path,
$field_name,
$metadata['name']
),
'5.5.0'
);
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 ) );
}
// Cache $template_path_norm and $stylesheet_path_norm to avoid unnecessary additional calls.
static $template_path_norm = '';
static $stylesheet_path_norm = '';
if ( ! $template_path_norm || ! $stylesheet_path_norm ) {
$template_path_norm = wp_normalize_path( get_template_directory() );
$stylesheet_path_norm = wp_normalize_path( get_stylesheet_directory() );
}
$script_path_norm = wp_normalize_path( realpath( dirname( $metadata['file'] ) . '/' . $script_path ) );
$is_core_block = isset( $metadata['file'] ) && str_starts_with( $metadata['file'], $wpinc_path_norm );
/*
* Determine if the block script was registered in a theme, by checking if the script path starts with either
* the parent (template) or child (stylesheet) directory path.
*/
$is_parent_theme_block = str_starts_with( $script_path_norm, trailingslashit( $template_path_norm ) );
$is_child_theme_block = str_starts_with( $script_path_norm, trailingslashit( $stylesheet_path_norm ) );
$is_theme_block = ( $is_parent_theme_block || $is_child_theme_block );
$script_uri = '';
if ( $is_core_block ) {
$script_uri = includes_url( str_replace( $wpinc_path_norm, '', $script_path_norm ) );
} elseif ( $is_theme_block ) {
// Get the script path deterministically based on whether or not it was registered in a parent or child theme.
$script_uri = $is_parent_theme_block
? get_theme_file_uri( str_replace( $template_path_norm, '', $script_path_norm ) )
: get_theme_file_uri( str_replace( $stylesheet_path_norm, '', $script_path_norm ) );
} else {
// Fallback to plugins_url().
$script_uri = plugins_url( $script_path, $metadata['file'] );
}
$script_args = array();
if ( 'viewScript' === $field_name ) {
$script_args['strategy'] = 'defer';
}
$script_asset = require $script_asset_path;
$script_dependencies = isset( $script_asset['dependencies'] ) ? $script_asset['dependencies'] : array();
$result = wp_register_script(
$script_handle,
$script_uri,
$script_dependencies,
isset( $script_asset['version'] ) ? $script_asset['version'] : false,
$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 ) );
$has_style_file = '' !== $style_path_norm;
if ( $has_style_file ) {
$style_uri = plugins_url( $style_path, $metadata['file'] );
// Cache $template_path_norm and $stylesheet_path_norm to avoid unnecessary additional calls.
static $template_path_norm = '';
static $stylesheet_path_norm = '';
if ( ! $template_path_norm || ! $stylesheet_path_norm ) {
$template_path_norm = wp_normalize_path( get_template_directory() );
$stylesheet_path_norm = wp_normalize_path( get_stylesheet_directory() );
}
// Determine if the block style was registered in a theme, by checking if the script path starts with either
// the parent (template) or child (stylesheet) directory path.
$is_parent_theme_block = str_starts_with( $style_path_norm, trailingslashit( $template_path_norm ) );
$is_child_theme_block = str_starts_with( $style_path_norm, trailingslashit( $stylesheet_path_norm ) );
$is_theme_block = ( $is_parent_theme_block || $is_child_theme_block );
if ( $is_core_block ) {
// All possible $style_path variants for core blocks are hard-coded above.
$style_uri = includes_url( 'blocks/' . str_replace( 'core/', '', $metadata['name'] ) . '/' . $style_path );
} elseif ( $is_theme_block ) {
// Get the script path deterministically based on whether or not it was registered in a parent or child theme.
$style_uri = $is_parent_theme_block
? get_theme_file_uri( str_replace( $template_path_norm, '', $style_path_norm ) )
: get_theme_file_uri( str_replace( $stylesheet_path_norm, '', $style_path_norm ) );
}
} else {
$style_uri = false;
}
$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 ( $has_style_file ) {
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 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.
*
* @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.
*/
static $core_blocks_meta;
if ( ! $core_blocks_meta ) {
$core_blocks_meta = require ABSPATH . WPINC . '/blocks/blocks-json.php';
}
$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 );
if ( ! $is_core_block && ! file_exists( $metadata_file ) ) {
return false;
}
// Try to get metadata from the static cache for core blocks.
$metadata = false;
if ( $is_core_block ) {
$core_block_name = str_replace( ABSPATH . WPINC . '/blocks/', '', $file_or_folder );
if ( ! empty( $core_blocks_meta[ $core_block_name ] ) ) {
$metadata = $core_blocks_meta[ $core_block_name ];
}
}
// If metadata is not found in the static cache, read it from the file.
if ( ! $metadata ) {
$metadata = wp_json_file_decode( $metadata_file, array( 'associative' => true ) );
}
if ( ! is_array( $metadata ) || empty( $metadata['name'] ) ) {
return false;
}
$metadata['file'] = wp_normalize_path( realpath( $metadata_file ) );
/**
* 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',
'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',
);
$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 ( $textdomain && isset( $i18n_schema->$key ) ) {
$settings[ $mapped_key ] = translate_settings_using_i18n_schema( $i18n_schema->$key, $settings[ $key ], $textdomain );
}
}
}
$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( $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;
}
}
$style_fields = array(
'editorStyle' => 'editor_style_handles',
'style' => 'style_handles',
);
foreach ( $style_fields as $metadata_field_name => $settings_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.', 'gutenberg' ),
'6.4.0'
);
continue;
}
if ( ! isset( $position_mappings[ $position ] ) ) {
continue;
}
$settings['block_hooks'][ $anchor_block_name ] = $position_mappings[ $position ];
}
}
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 ) { // phpcs:ignore VariableAnalysis.CodeAnalysis.VariableAnalysis.UnusedVariable
ob_start();
require $template_path;
return ob_get_clean();
};
}
}
/**
* 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',
array_merge(
$settings,
$args
),
$metadata
);
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
* 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;
}
/**
* 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,
$serialized_block_name
);
}
/**
* Returns the content of a block, including comment delimiters, serializing all
* attributes from the given parsed block.
*
* This should be used when preparing a block to be saved to post content.
* Prefer `render_block` when preparing a block for display. Unlike
* `render_block`, this does not evaluate a block's `render_callback`, and will
* instead preserve the markup as parsed.
*
* @since 5.3.1
* @since 6.4.0 The `$callback` parameter was added.
*
* @param array $block A representative array of a single parsed block object. See WP_Block_Parser_Block.
* @param callable|null $callback Optional. Callback to run on each block in the tree before serialization. Default null.
* @return string String of rendered HTML.
*/
function serialize_block( $block, $callback = null ) {
if ( is_callable( $callback ) ) {
$block = call_user_func( $callback, $block );
}
$block_content = '';
$index = 0;
foreach ( $block['innerContent'] as $chunk ) {
$block_content .= is_string( $chunk ) ? $chunk : serialize_block( $block['innerBlocks'][ $index++ ], $callback );
}
if ( ! is_array( $block['attrs'] ) ) {
$block['attrs'] = array();
}
return get_comment_delimited_block_content(
$block['blockName'],
$block['attrs'],
$block_content
);
}
/**
* Returns a joined string of the aggregate serialization of the given
* parsed blocks.
*
* @since 5.3.1
* @since 6.4.0 The `$callback` parameter was added.
*
* @param array[] $blocks An array of representative arrays of parsed block objects. See serialize_block().
* @param callable|null $callback Optional. Callback to run on each block in the tree before serialization. Default null.
* @return string String of rendered HTML.
*/
function serialize_blocks( $blocks, $callback = null ) {
$result = '';
foreach ( $blocks as $block ) {
$result .= serialize_block( $block, $callback );
};
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().
*
* @private
* @since 6.2.1
*
* @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 );
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
*
* @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().
* @return string[]|string The filtered and sanitized result.
*/
function filter_block_kses_value( $value, $allowed_html, $allowed_protocols = array() ) {
if ( is_array( $value ) ) {
foreach ( $value as $key => $inner_value ) {
$filtered_key = filter_block_kses_value( $key, $allowed_html, $allowed_protocols );
$filtered_value = filter_block_kses_value( $inner_value, $allowed_html, $allowed_protocols );
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;
}
/**
* 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',