<?php
/**
* Interactivity API: WP_Interactivity_API class.
*
* @package WordPress
* @subpackage Interactivity API
* @since 6.5.0
*/
/**
* Class used to process the Interactivity API on the server.
*
* @since 6.5.0
*/
final class WP_Interactivity_API {
/**
* Holds the mapping of directive attribute names to their processor methods.
*
* @since 6.5.0
* @var array
*/
private static $directive_processors = array(
'data-wp-interactive' => 'data_wp_interactive_processor',
'data-wp-router-region' => 'data_wp_router_region_processor',
'data-wp-context' => 'data_wp_context_processor',
'data-wp-bind' => 'data_wp_bind_processor',
'data-wp-class' => 'data_wp_class_processor',
'data-wp-style' => 'data_wp_style_processor',
'data-wp-text' => 'data_wp_text_processor',
/*
* `data-wp-each` needs to be processed in the last place because it moves
* the cursor to the end of the processed items to prevent them to be
* processed twice.
*/
'data-wp-each' => 'data_wp_each_processor',
);
/**
* Holds the initial state of the different Interactivity API stores.
*
* This state is used during the server directive processing. Then, it is
* serialized and sent to the client as part of the interactivity data to be
* recovered during the hydration of the client interactivity stores.
*
* @since 6.5.0
* @var array
*/
private $state_data = array();
/**
* Holds the configuration required by the different Interactivity API stores.
*
* This configuration is serialized and sent to the client as part of the
* interactivity data and can be accessed by the client interactivity stores.
*
* @since 6.5.0
* @var array
*/
private $config_data = array();
/**
* Keeps track of all derived state closures accessed during server-side rendering.
*
* This data is serialized and sent to the client as part of the interactivity
* data, and is handled later in the client to support derived state props that
* are lazily hydrated.
*
* @since 6.9.0
* @var array
*/
private $derived_state_closures = array();
/**
* Flag that indicates whether the `data-wp-router-region` directive has
* been found in the HTML and processed.
*
* The value is saved in a private property of the WP_Interactivity_API
* instance instead of using a static variable inside the processor
* function, which would hold the same value for all instances
* independently of whether they have processed any
* `data-wp-router-region` directive or not.
*
* @since 6.5.0
* @var bool
*/
private $has_processed_router_region = false;
/**
* Set of script modules that can be loaded after client-side navigation.
*
* @since 6.9.0
* @var array<string, true>
*/
private $script_modules_that_can_load_on_client_navigation = array();
/**
* Stack of namespaces defined by `data-wp-interactive` directives, in
* the order they are processed.
*
* This is only available during directive processing, otherwise it is `null`.
*
* @since 6.6.0
* @var array<string>|null
*/
private $namespace_stack = null;
/**
* Stack of contexts defined by `data-wp-context` directives, in
* the order they are processed.
*
* This is only available during directive processing, otherwise it is `null`.
*
* @since 6.6.0
* @var array<array<mixed>>|null
*/
private $context_stack = null;
/**
* Representation in array format of the element currently being processed.
*
* This is only available during directive processing, otherwise it is `null`.
*
* @since 6.7.0
* @var array{attributes: array<string, string|bool>}|null
*/
private $current_element = null;
/**
* Gets and/or sets the initial state of an Interactivity API store for a
* given namespace.
*
* If state for that store namespace already exists, it merges the new
* provided state with the existing one.
*
* When no namespace is specified, it returns the state defined for the
* current value in the internal namespace stack during a `process_directives` call.
*
* @since 6.5.0
* @since 6.6.0 The `$store_namespace` param is optional.
*
* @param string $store_namespace Optional. The unique store namespace identifier.
* @param array $state Optional. The array that will be merged with the existing state for the specified
* store namespace.
* @return array The current state for the specified store namespace. This will be the updated state if a $state
* argument was provided.
*/
public function state( ?string $store_namespace = null, ?array $state = null ): array {
if ( ! $store_namespace ) {
if ( $state ) {
_doing_it_wrong(
__METHOD__,
__( 'The namespace is required when state data is passed.' ),
'6.6.0'
);
return array();
}
if ( null !== $store_namespace ) {
_doing_it_wrong(
__METHOD__,
__( 'The namespace should be a non-empty string.' ),
'6.6.0'
);
return array();
}
if ( null === $this->namespace_stack ) {
_doing_it_wrong(
__METHOD__,
__( 'The namespace can only be omitted during directive processing.' ),
'6.6.0'
);
return array();
}
$store_namespace = end( $this->namespace_stack );
}
if ( ! isset( $this->state_data[ $store_namespace ] ) ) {
$this->state_data[ $store_namespace ] = array();
}
if ( is_array( $state ) ) {
$this->state_data[ $store_namespace ] = array_replace_recursive(
$this->state_data[ $store_namespace ],
$state
);
}
return $this->state_data[ $store_namespace ];
}
/**
* Gets and/or sets the configuration of the Interactivity API for a given
* store namespace.
*
* If configuration for that store namespace exists, it merges the new
* provided configuration with the existing one.
*
* @since 6.5.0
*
* @param string $store_namespace The unique store namespace identifier.
* @param array $config Optional. The array that will be merged with the existing configuration for the
* specified store namespace.
* @return array The configuration for the specified store namespace. This will be the updated configuration if a
* $config argument was provided.
*/
public function config( string $store_namespace, array $config = array() ): array {
if ( ! isset( $this->config_data[ $store_namespace ] ) ) {
$this->config_data[ $store_namespace ] = array();
}
if ( is_array( $config ) ) {
$this->config_data[ $store_namespace ] = array_replace_recursive(
$this->config_data[ $store_namespace ],
$config
);
}
return $this->config_data[ $store_namespace ];
}
/**
* Prints the serialized client-side interactivity data.
*
* Encodes the config and initial state into JSON and prints them inside a
* script tag of type "application/json". Once in the browser, the state will
* be parsed and used to hydrate the client-side interactivity stores and the
* configuration will be available using a `getConfig` utility.
*
* @since 6.5.0
*
* @deprecated 6.7.0 Client data passing is handled by the {@see "script_module_data_{$module_id}"} filter.
*/
public function print_client_interactivity_data() {
_deprecated_function( __METHOD__, '6.7.0' );
}
/**
* Set client-side interactivity-router data.
*
* Once in the browser, the state will be parsed and used to hydrate the client-side
* interactivity stores and the configuration will be available using a `getConfig` utility.
*
* @since 6.7.0
*
* @param array $data Data to filter.
* @return array Data for the Interactivity Router script module.
*/
public function filter_script_module_interactivity_router_data( array $data ): array {
if ( ! isset( $data['i18n'] ) ) {
$data['i18n'] = array();
}
$data['i18n']['loading'] = __( 'Loading page, please wait.' );
$data['i18n']['loaded'] = __( 'Page Loaded.' );
return $data;
}
/**
* Set client-side interactivity data.
*
* Once in the browser, the state will be parsed and used to hydrate the client-side
* interactivity stores and the configuration will be available using a `getConfig` utility.
*
* @since 6.7.0
* @since 6.9.0 Serializes derived state props accessed during directive processing.
*
* @param array $data Data to filter.
* @return array Data for the Interactivity API script module.
*/
public function filter_script_module_interactivity_data( array $data ): array {
if (
empty( $this->state_data ) &&
empty( $this->config_data ) &&
empty( $this->derived_state_closures )
) {
return $data;
}
$config = array();
foreach ( $this->config_data as $key => $value ) {
if ( ! empty( $value ) ) {
$config[ $key ] = $value;
}
}
if ( ! empty( $config ) ) {
$data['config'] = $config;
}
$state = array();
foreach ( $this->state_data as $key => $value ) {
if ( ! empty( $value ) ) {
$state[ $key ] = $value;
}
}
if ( ! empty( $state ) ) {
$data['state'] = $state;
}
$derived_props = array();
foreach ( $this->derived_state_closures as $key => $value ) {
if ( ! empty( $value ) ) {
$derived_props[ $key ] = $value;
}
}
if ( ! empty( $derived_props ) ) {
$data['derivedStateClosures'] = $derived_props;
}
return $data;
}
/**
* Returns the latest value on the context stack with the passed namespace.
*
* When the namespace is omitted, it uses the current namespace on the
* namespace stack during a `process_directives` call.
*
* @since 6.6.0
*
* @param string $store_namespace Optional. The unique store namespace identifier.
*/
public function get_context( ?string $store_namespace = null ): array {
if ( null === $this->context_stack ) {
_doing_it_wrong(
__METHOD__,
__( 'The context can only be read during directive processing.' ),
'6.6.0'
);
return array();
}
if ( ! $store_namespace ) {
if ( null !== $store_namespace ) {
_doing_it_wrong(
__METHOD__,
__( 'The namespace should be a non-empty string.' ),
'6.6.0'
);
return array();
}
$store_namespace = end( $this->namespace_stack );
}
$context = end( $this->context_stack );
return ( $store_namespace && $context && isset( $context[ $store_namespace ] ) )
? $context[ $store_namespace ]
: array();
}
/**
* Returns an array representation of the current element being processed.
*
* The returned array contains a copy of the element attributes.
*
* @since 6.7.0
*
* @return array{attributes: array<string, string|bool>}|null Current element.
*/
public function get_element(): ?array {
if ( null === $this->current_element ) {
_doing_it_wrong(
__METHOD__,
__( 'The element can only be read during directive processing.' ),
'6.7.0'
);
}
return $this->current_element;
}
/**
* Registers the `@wordpress/interactivity` script modules.
*
* @deprecated 6.7.0 Script Modules registration is handled by {@see wp_default_script_modules()}.
*
* @since 6.5.0
*/
public function register_script_modules() {
_deprecated_function( __METHOD__, '6.7.0', 'wp_default_script_modules' );
}
/**
* Adds the necessary hooks for the Interactivity API.
*
* @since 6.5.0
* @since 6.9.0 Adds support for client-side navigation in script modules.
*/
public function add_hooks() {
add_filter( 'script_module_data_@wordpress/interactivity', array( $this, 'filter_script_module_interactivity_data' ) );
add_filter( 'script_module_data_@wordpress/interactivity-router', array( $this, 'filter_script_module_interactivity_router_data' ) );
add_filter( 'wp_script_attributes', array( $this, 'add_load_on_client_navigation_attribute_to_script_modules' ), 10, 1 );
}
/**
* Adds the `data-wp-router-options` attribute to script modules that
* support client-side navigation.
*
* This method filters the script attributes to include loading instructions
* for the Interactivity API router, indicating which modules can be loaded
* during client-side navigation.
*
* @since 6.9.0
*
* @param array<string, string|true>|mixed $attributes The script tag attributes.
* @return array The modified script tag attributes.
*/
public function add_load_on_client_navigation_attribute_to_script_modules( $attributes ) {
if (
is_array( $attributes ) &&
isset( $attributes['type'], $attributes['id'] ) &&
'module' === $attributes['type'] &&
array_key_exists(
preg_replace( '/-js-module$/', '', $attributes['id'] ),
$this->script_modules_that_can_load_on_client_navigation
)
) {
$attributes['data-wp-router-options'] = wp_json_encode( array( 'loadOnClientNavigation' => true ) );
}
return $attributes;
}
/**
* Marks a script module as compatible with client-side navigation.
*
* This method registers a script module to be loaded during client-side
* navigation in the Interactivity API router. Script modules marked with
* this method will have the `loadOnClientNavigation` option enabled in the
* `data-wp-router-options` directive.
*
* @since 6.9.0
*
* @param string $script_module_id The script module identifier.
*/
public function add_client_navigation_support_to_script_module( string $script_module_id ) {
$this->script_modules_that_can_load_on_client_navigation[ $script_module_id ] = true;
}
/**
* Processes the interactivity directives contained within the HTML content
* and updates the markup accordingly.
*
* @since 6.5.0
*
* @param string $html The HTML content to process.
* @return string The processed HTML content. It returns the original content when the HTML contains unbalanced tags.
*/
public function process_directives( string $html ): string {
if ( ! str_contains( $html, 'data-wp-' ) ) {
return $html;
}
$this->namespace_stack = array();
$this->context_stack = array();
$result = $this->_process_directives( $html );
$this->namespace_stack = null;
$this->context_stack = null;
return null === $result ? $html : $result;
}
/**
* Processes the interactivity directives contained within the HTML content
* and updates the markup accordingly.
*
* It uses the WP_Interactivity_API instance's context and namespace stacks,
* which are shared between all calls.
*
* This method returns null if the HTML contains unbalanced tags.
*
* @since 6.6.0
*
* @param string $html The HTML content to process.
* @return string|null The processed HTML content. It returns null when the HTML contains unbalanced tags.
*/
private function _process_directives( string $html ) {
$p = new WP_Interactivity_API_Directives_Processor( $html );
$tag_stack = array();
$unbalanced = false;
$directive_processor_prefixes = array_keys( self::$directive_processors );
$directive_processor_prefixes_reversed = array_reverse( $directive_processor_prefixes );
/*
* Save the current size for each stack to restore them in case
* the processing finds unbalanced tags.
*/
$namespace_stack_size = count( $this->namespace_stack );
$context_stack_size = count( $this->context_stack );
while ( $p->next_tag( array( 'tag_closers' => 'visit' ) ) ) {
$tag_name = $p->get_tag();
/*
* Directives inside SVG and MATH tags are not processed,
* as they are not compatible with the Tag Processor yet.
* We still process the rest of the HTML.
*/
if ( 'SVG' === $tag_name || 'MATH' === $tag_name ) {
if ( $p->get_attribute_names_with_prefix( 'data-wp-' ) ) {
/* translators: 1: SVG or MATH HTML tag, 2: Namespace of the interactive block. */
$message = sprintf( __( 'Interactivity directives were detected on an incompatible %1$s tag when processing "%2$s". These directives will be ignored in the server side render.' ), $tag_name, end( $this->namespace_stack ) );
_doing_it_wrong( __METHOD__, $message, '6.6.0' );
}
$p->skip_to_tag_closer();
continue;
}
if ( $p->is_tag_closer() ) {
list( $opening_tag_name, $directives_prefixes ) = ! empty( $tag_stack ) ? end( $tag_stack ) : array( null, null );
if ( 0 === count( $tag_stack ) || $opening_tag_name !== $tag_name ) {
/*
* If the tag stack is empty or the matching opening tag is not the
* same than the closing tag, it means the HTML is unbalanced and it
* stops processing it.
*/
$unbalanced = true;
break;
} else {
// Remove the last tag from the stack.
array_pop( $tag_stack );
}
} else {
$each_child_attrs = $p->get_attribute_names_with_prefix( 'data-wp-each-child' );
if ( null === $each_child_attrs ) {
continue;
}
if ( 0 !== count( $each_child_attrs ) ) {
/*
* If the tag has a `data-wp-each-child` directive, jump to its closer
* tag because those tags have already been processed.
*/
$p->next_balanced_tag_closer_tag();
continue;
} else {
$directives_prefixes = array();
// Checks if there is a server directive processor registered for each directive.
foreach ( $p->get_attribute_names_with_prefix( 'data-wp-' ) as $attribute_name ) {
$parsed_directive = $this->parse_directive_name( $attribute_name );
if ( empty( $parsed_directive ) ) {
continue;
}
$directive_prefix = 'data-wp-' . $parsed_directive['prefix'];
if ( array_key_exists( $directive_prefix, self::$directive_processors ) ) {
$directives_prefixes[] = $directive_prefix;
}
}
/*
* If this tag will visit its closer tag, it adds it to the tag stack
* so it can process its closing tag and check for unbalanced tags.
*/
if ( $p->has_and_visits_its_closer_tag() ) {
$tag_stack[] = array( $tag_name, $directives_prefixes );
}
}
}
/*
* If the matching opener tag didn't have any directives, it can skip the
* processing.
*/
if ( 0 === count( $directives_prefixes ) ) {
continue;
}
// Directive processing might be different depending on if it is entering the tag or exiting it.
$modes = array(
'enter' => ! $p->is_tag_closer(),
'exit' => $p->is_tag_closer() || ! $p->has_and_visits_its_closer_tag(),
);
// Get the element attributes to include them in the element representation.
$element_attrs = array();
$attr_names = $p->get_attribute_names_with_prefix( '' ) ?? array();
foreach ( $attr_names as $name ) {
$element_attrs[ $name ] = $p->get_attribute( $name );
}
// Assign the current element right before running its directive processors.
$this->current_element = array(
'attributes' => $element_attrs,
);
foreach ( $modes as $mode => $should_run ) {
if ( ! $should_run ) {
continue;
}
/*
* Sorts the attributes by the order of the `directives_processor` array
* and checks what directives are present in this element.
*/
$existing_directives_prefixes = array_intersect(
'enter' === $mode ? $directive_processor_prefixes : $directive_processor_prefixes_reversed,
$directives_prefixes
);
foreach ( $existing_directives_prefixes as $directive_prefix ) {
$func = is_array( self::$directive_processors[ $directive_prefix ] )
? self::$directive_processors[ $directive_prefix ]
: array( $this, self::$directive_processors[ $directive_prefix ] );
call_user_func_array( $func, array( $p, $mode, &$tag_stack ) );
}
}
// Clear the current element.
$this->current_element = null;
}
if ( $unbalanced ) {
// Reset the namespace and context stacks to their previous values.
array_splice( $this->namespace_stack, $namespace_stack_size );
array_splice( $this->context_stack, $context_stack_size );
}
/*
* It returns null if the HTML is unbalanced because unbalanced HTML is
* not safe to process. In that case, the Interactivity API runtime will
* update the HTML on the client side during the hydration. It will display
* a notice to the developer in the console to inform them about the issue.
*/
if ( $unbalanced || 0 < count( $tag_stack ) ) {
return null;
}
return $p->get_updated_html();
}
/**
* Evaluates the reference path passed to a directive based on the current
* store namespace, state and context.
*
* @since 6.5.0
* @since 6.6.0 The function now adds a warning when the namespace is null, falsy, or the directive value is empty.
* @since 6.6.0 Removed `default_namespace` and `context` arguments.
* @since 6.6.0 Add support for derived state.
* @since 6.9.0 Recieve $entry as an argument instead of the directive value string.
*
* @param array $entry An array containing a whole directive entry with its namespace, value, suffix, or unique ID.
* @return mixed|null The result of the evaluation. Null if the reference path doesn't exist or the namespace is falsy.
*/
private function evaluate( $entry ) {
$context = end( $this->context_stack );
['namespace' => $ns, 'value' => $path] = $entry;
if ( ! $ns || ! $path ) {
/* translators: %s: The directive value referenced. */
$message = sprintf( __( 'Namespace or reference path cannot be empty. Directive value referenced: %s' ), json_encode( $entry ) );
_doing_it_wrong( __METHOD__, $message, '6.6.0' );
return null;
}
$store = array(
'state' => $this->state_data[ $ns ] ?? array(),
'context' => $context[ $ns ] ?? array(),
);
// Checks if the reference path is preceded by a negation operator (!).
$should_negate_value = '!' === $path[0];
$path = $should_negate_value ? substr( $path, 1 ) : $path;
// Extracts the value from the store using the reference path.
$path_segments = explode( '.', $path );
$current = $store;
foreach ( $path_segments as $index => $path_segment ) {
/*
* Special case for numeric arrays and strings. Add length
* property mimicking JavaScript behavior.
*
* @since 6.8.0
*/
if ( 'length' === $path_segment ) {
if ( is_array( $current ) && array_is_list( $current ) ) {
$current = count( $current );
break;
}
if ( is_string( $current ) ) {
/*
* Differences in encoding between PHP strings and
* JavaScript mean that it's complicated to calculate
* the string length JavaScript would see from PHP.
* `strlen` is a reasonable approximation.
*
* Users that desire a more precise length likely have
* more precise needs than "bytelength" and should
* implement their own length calculation in derived
* state taking into account encoding and their desired
* output (codepoints, graphemes, bytes, etc.).
*/
$current = strlen( $current );
break;
}
}
if ( ( is_array( $current ) || $current instanceof ArrayAccess ) && isset( $current[ $path_segment ] ) ) {
$current = $current[ $path_segment ];
} elseif ( is_object( $current ) && isset( $current->$path_segment ) ) {
$current = $current->$path_segment;
} else {
$current = null;
break;
}
if ( $current instanceof Closure ) {
/*
* This state getter's namespace is added to the stack so that
* `state()` or `get_config()` read that namespace when called
* without specifying one.
*/
array_push( $this->namespace_stack, $ns );
try {
$current = $current();
/*
* Tracks derived state properties that are accessed during
* rendering.
*
* @since 6.9.0
*/
$this->derived_state_closures[ $ns ] = $this->derived_state_closures[ $ns ] ?? array();
// Builds path for the current property and add it to tracking if not already present.
$current_path = implode( '.', array_slice( $path_segments, 0, $index + 1 ) );
if ( ! in_array( $current_path, $this->derived_state_closures[ $ns ], true ) ) {
$this->derived_state_closures[ $ns ][] = $current_path;
}
} catch ( Throwable $e ) {
_doing_it_wrong(
__METHOD__,
sprintf(
/* translators: 1: Path pointing to an Interactivity API state property, 2: Namespace for an Interactivity API store. */
__( 'Uncaught error executing a derived state callback with path "%1$s" and namespace "%2$s".' ),
$path,
$ns
),
'6.6.0'
);
return null;
} finally {
// Remove the property's namespace from the stack.
array_pop( $this->namespace_stack );
}
}
}
// Returns the opposite if it contains a negation operator (!).
return $should_negate_value ? ! $current : $current;
}
/**
* Parse the directive name to extract the following parts:
* - Prefix: The main directive name without "data-wp-".
* - Suffix: An optional suffix used during directive processing, extracted after the first double hyphen "--".
* - Unique ID: An optional unique identifier, extracted after the first triple hyphen "---".
*
* This function has an equivalent version for the client side.
* See `parseDirectiveName` in https://github.com/WordPress/gutenberg/blob/trunk/packages/interactivity/src/vdom.ts.:
*
* See examples in the function unit tests `test_parse_directive_name`.
*
* @since 6.9.0
*
* @param string $directive_name The directive attribute name.
* @return array An array containing the directive prefix, optional suffix, and optional unique ID.
*/
private function parse_directive_name( string $directive_name ): ?array {
// Remove the first 8 characters (assumes "data-wp-" prefix)
$name = substr( $directive_name, 8 );
// Check for invalid characters (anything not a-z, 0-9, -, or _)
if ( preg_match( '/[^a-z0-9\-_]/i', $name ) ) {
return null;
}
// Find the first occurrence of '--' to separate the prefix
$suffix_index = strpos( $name, '--' );
if ( false === $suffix_index ) {
return array(
'prefix' => $name,
'suffix' => null,
'unique_id' => null,
);
}
$prefix = substr( $name, 0, $suffix_index );
$remaining = substr( $name, $suffix_index );
// If remaining starts with '---' but not '----', it's a unique_id
if ( '---' === substr( $remaining, 0, 3 ) && '-' !== ( $remaining[3] ?? '' ) ) {
return array(
'prefix' => $prefix,
'suffix' => null,
'unique_id' => '---' !== $remaining ? substr( $remaining, 3 ) : null,
);
}
// Otherwise, remove the first two dashes for a potential suffix
$suffix = substr( $remaining, 2 );
// Look for '---' in the suffix for a unique_id
$unique_id_index = strpos( $suffix, '---' );
if ( false !== $unique_id_index && '-' !== ( $suffix[ $unique_id_index + 3 ] ?? '' ) ) {
$unique_id = substr( $suffix, $unique_id_index + 3 );
$suffix = substr( $suffix, 0, $unique_id_index );
return array(
'prefix' => $prefix,
'suffix' => empty( $suffix ) ? null : $suffix,
'unique_id' => empty( $unique_id ) ? null : $unique_id,
);
}
return array(
'prefix' => $prefix,
'suffix' => empty( $suffix ) ? null : $suffix,
'unique_id' => null,
);
}
/**
* Parses and extracts the namespace and reference path from the given
* directive attribute value.
*
* If the value doesn't contain an explicit namespace, it returns the
* default one. If the value contains a JSON object instead of a reference
* path, the function tries to parse it and return the resulting array. If
* the value contains strings that represent booleans ("true" and "false"),
* numbers ("1" and "1.2") or "null", the function also transform them to
* regular booleans, numbers and `null`.
*
* Example:
*
* extract_directive_value( 'actions.foo', 'myPlugin' ) => array( 'myPlugin', 'actions.foo' )
* extract_directive_value( 'otherPlugin::actions.foo', 'myPlugin' ) => array( 'otherPlugin', 'actions.foo' )
* extract_directive_value( '{ "isOpen": false }', 'myPlugin' ) => array( 'myPlugin', array( 'isOpen' => false ) )
* extract_directive_value( 'otherPlugin::{ "isOpen": false }', 'myPlugin' ) => array( 'otherPlugin', array( 'isOpen' => false ) )
*
* @since 6.5.0
*
* @param string|true $directive_value The directive attribute value. It can be `true` when it's a boolean
* attribute.
* @param string|null $default_namespace Optional. The default namespace if none is explicitly defined.
* @return array An array containing the namespace in the first item and the JSON, the reference path, or null on the
* second item.
*/
private function extract_directive_value( $directive_value, $default_namespace = null ): array {
if ( empty( $directive_value ) || is_bool( $directive_value ) ) {
return array( $default_namespace, null );
}
// Replaces the value and namespace if there is a namespace in the value.
if ( 1 === preg_match( '/^([\w\-_\/]+)::./', $directive_value ) ) {
list($default_namespace, $directive_value) = explode( '::', $directive_value, 2 );
}
/*
* Tries to decode the value as a JSON object. If it fails and the value
* isn't `null`, it returns the value as it is. Otherwise, it returns the
* decoded JSON or null for the string `null`.
*/
$decoded_json = json_decode( $directive_value, true );
if ( null !== $decoded_json || 'null' === $directive_value ) {
$directive_value = $decoded_json;
}
return array( $default_namespace, $directive_value );
}
/**
* Parse the HTML element and get all the valid directives with the given prefix.
*
* @since 6.9.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $prefix The directive prefix to filter by.
* @return array An array of entries containing the directive namespace, value, suffix, and unique ID.
*/
private function get_directive_entries( WP_Interactivity_API_Directives_Processor $p, string $prefix ) {
$directive_attributes = $p->get_attribute_names_with_prefix( 'data-wp-' . $prefix );
$entries = array();
foreach ( $directive_attributes as $attribute_name ) {
[ 'prefix' => $attr_prefix, 'suffix' => $suffix, 'unique_id' => $unique_id] = $this->parse_directive_name( $attribute_name );
// Ensure it is the desired directive.
if ( $prefix !== $attr_prefix ) {
continue;
}
list( $namespace, $value ) = $this->extract_directive_value( $p->get_attribute( $attribute_name ), end( $this->namespace_stack ) );
$entries[] = array(
'namespace' => $namespace,
'value' => $value,
'suffix' => $suffix,
'unique_id' => $unique_id,
);
}
// Sort directive entries to ensure stable ordering with the client.
// Put nulls first, then sort by suffix and finally by uniqueIds.
usort(
$entries,
function ( $a, $b ) {
$a_suffix = $a['suffix'] ?? '';
$b_suffix = $b['suffix'] ?? '';
if ( $a_suffix !== $b_suffix ) {
return $a_suffix < $b_suffix ? -1 : 1;
}
$a_id = $a['unique_id'] ?? '';
$b_id = $b['unique_id'] ?? '';
if ( $a_id === $b_id ) {
return 0;
}
return $a_id > $b_id ? 1 : -1;
}
);
return $entries;
}
/**
* Transforms a kebab-case string to camelCase.
*
* @since 6.5.0
*
* @param string $str The kebab-case string to transform to camelCase.
* @return string The transformed camelCase string.
*/
private function kebab_to_camel_case( string $str ): string {
return lcfirst(
preg_replace_callback(
'/(-)([a-z])/',
function ( $matches ) {
return strtoupper( $matches[2] );
},
strtolower( rtrim( $str, '-' ) )
)
);
}
/**
* Processes the `data-wp-interactive` directive.
*
* It adds the default store namespace defined in the directive value to the
* stack so that it's available for the nested interactivity elements.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_interactive_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
// When exiting tags, it removes the last namespace from the stack.
if ( 'exit' === $mode ) {
array_pop( $this->namespace_stack );
return;
}
// Tries to decode the `data-wp-interactive` attribute value.
$attribute_value = $p->get_attribute( 'data-wp-interactive' );
/*
* Pushes the newly defined namespace or the current one if the
* `data-wp-interactive` definition was invalid or does not contain a
* namespace. It does so because the function pops out the current namespace
* from the stack whenever it finds a `data-wp-interactive`'s closing tag,
* independently of whether the previous `data-wp-interactive` definition
* contained a valid namespace.
*/
$new_namespace = null;
if ( is_string( $attribute_value ) && ! empty( $attribute_value ) ) {
$decoded_json = json_decode( $attribute_value, true );
if ( is_array( $decoded_json ) ) {
$new_namespace = $decoded_json['namespace'] ?? null;
} else {
$new_namespace = $attribute_value;
}
}
$this->namespace_stack[] = ( $new_namespace && 1 === preg_match( '/^([\w\-_\/]+)/', $new_namespace ) )
? $new_namespace
: end( $this->namespace_stack );
}
/**
* Processes the `data-wp-context` directive.
*
* It adds the context defined in the directive value to the stack so that
* it's available for the nested interactivity elements.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_context_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
// When exiting tags, it removes the last context from the stack.
if ( 'exit' === $mode ) {
array_pop( $this->context_stack );
return;
}
$entries = $this->get_directive_entries( $p, 'context' );
$context = end( $this->context_stack ) !== false ? end( $this->context_stack ) : array();
foreach ( $entries as $entry ) {
if ( null !== $entry['suffix'] ) {
continue;
}
$context = array_replace_recursive(
$context,
array( $entry['namespace'] => is_array( $entry['value'] ) ? $entry['value'] : array() )
);
}
$this->context_stack[] = $context;
}
/**
* Processes the `data-wp-bind` directive.
*
* It updates or removes the bound attributes based on the evaluation of its
* associated reference.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_bind_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
if ( 'enter' === $mode ) {
$entries = $this->get_directive_entries( $p, 'bind' );
foreach ( $entries as $entry ) {
if ( empty( $entry['suffix'] ) || null !== $entry['unique_id'] ) {
return;
}
$result = $this->evaluate( $entry );
if (
null !== $result &&
(
false !== $result ||
( strlen( $entry['suffix'] ) > 5 && '-' === $entry['suffix'][4] )
)
) {
/*
* If the result of the evaluation is a boolean and the attribute is
* `aria-` or `data-, convert it to a string "true" or "false". It
* follows the exact same logic as Preact because it needs to
* replicate what Preact will later do in the client:
* https://github.com/preactjs/preact/blob/ea49f7a0f9d1ff2c98c0bdd66aa0cbc583055246/src/diff/props.js#L131C24-L136
*/
if (
is_bool( $result ) &&
( strlen( $entry['suffix'] ) > 5 && '-' === $entry['suffix'][4] )
) {
$result = $result ? 'true' : 'false';
}
$p->set_attribute( $entry['suffix'], $result );
} else {
$p->remove_attribute( $entry['suffix'] );
}
}
}
}
/**
* Processes the `data-wp-class` directive.
*
* It adds or removes CSS classes in the current HTML element based on the
* evaluation of its associated references.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
if ( 'enter' === $mode ) {
$all_class_directives = $p->get_attribute_names_with_prefix( 'data-wp-class--' );
$entries = $this->get_directive_entries( $p, 'class' );
foreach ( $entries as $entry ) {
if ( empty( $entry['suffix'] ) ) {
continue;
}
$class_name = isset( $entry['unique_id'] ) && $entry['unique_id']
? "{$entry['suffix']}---{$entry['unique_id']}"
: $entry['suffix'];
if ( empty( $class_name ) ) {
return;
}
$result = $this->evaluate( $entry );
if ( $result ) {
$p->add_class( $class_name );
} else {
$p->remove_class( $class_name );
}
}
}
}
/**
* Processes the `data-wp-style` directive.
*
* It updates the style attribute value of the current HTML element based on
* the evaluation of its associated references.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_style_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
if ( 'enter' === $mode ) {
$entries = $this->get_directive_entries( $p, 'style' );
foreach ( $entries as $entry ) {
$style_property = $entry['suffix'];
if ( empty( $style_property ) || null !== $entry['unique_id'] ) {
continue;
}
$style_property_value = $this->evaluate( $entry );
$style_attribute_value = $p->get_attribute( 'style' );
$style_attribute_value = ( $style_attribute_value && ! is_bool( $style_attribute_value ) ) ? $style_attribute_value : '';
/*
* Checks first if the style property is not falsy and the style
* attribute value is not empty because if it is, it doesn't need to
* update the attribute value.
*/
if ( $style_property_value || $style_attribute_value ) {
$style_attribute_value = $this->merge_style_property( $style_attribute_value, $style_property, $style_property_value );
/*
* If the style attribute value is not empty, it sets it. Otherwise,
* it removes it.
*/
if ( ! empty( $style_attribute_value ) ) {
$p->set_attribute( 'style', $style_attribute_value );
} else {
$p->remove_attribute( 'style' );
}
}
}
}
}
/**
* Merges an individual style property in the `style` attribute of an HTML
* element, updating or removing the property when necessary.
*
* If a property is modified, the old one is removed and the new one is added
* at the end of the list.
*
* @since 6.5.0
*
* Example:
*
* merge_style_property( 'color:green;', 'color', 'red' ) => 'color:red;'
* merge_style_property( 'background:green;', 'color', 'red' ) => 'background:green;color:red;'
* merge_style_property( 'color:green;', 'color', null ) => ''
*
* @param string $style_attribute_value The current style attribute value.
* @param string $style_property_name The style property name to set.
* @param string|false|null $style_property_value The value to set for the style property. With false, null or an
* empty string, it removes the style property.
* @return string The new style attribute value after the specified property has been added, updated or removed.
*/
private function merge_style_property( string $style_attribute_value, string $style_property_name, $style_property_value ): string {
$style_assignments = explode( ';', $style_attribute_value );
$result = array();
$style_property_value = ! empty( $style_property_value ) ? rtrim( trim( $style_property_value ), ';' ) : null;
$new_style_property = $style_property_value ? $style_property_name . ':' . $style_property_value . ';' : '';
// Generates an array with all the properties but the modified one.
foreach ( $style_assignments as $style_assignment ) {
if ( empty( trim( $style_assignment ) ) ) {
continue;
}
list( $name, $value ) = explode( ':', $style_assignment );
if ( trim( $name ) !== $style_property_name ) {
$result[] = trim( $name ) . ':' . trim( $value ) . ';';
}
}
// Adds the new/modified property at the end of the list.
$result[] = $new_style_property;
return implode( '', $result );
}
/**
* Processes the `data-wp-text` directive.
*
* It updates the inner content of the current HTML element based on the
* evaluation of its associated reference.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_text_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
if ( 'enter' === $mode ) {
$entries = $this->get_directive_entries( $p, 'text' );
$valid_entry = null;
// Get the first valid `data-wp-text` entry without suffix or unique ID.
foreach ( $entries as $entry ) {
if ( null === $entry['suffix'] && null === $entry['unique_id'] && ! empty( $entry['value'] ) ) {
$valid_entry = $entry;
break;
}
}
if ( null === $valid_entry ) {
return;
}
$result = $this->evaluate( $valid_entry );
/*
* Follows the same logic as Preact in the client and only changes the
* content if the value is a string or a number. Otherwise, it removes the
* content.
*/
if ( is_string( $result ) || is_numeric( $result ) ) {
$p->set_content_between_balanced_tags( esc_html( $result ) );
} else {
$p->set_content_between_balanced_tags( '' );
}
}
}
/**
* Returns the CSS styles for animating the top loading bar in the router.
*
* @since 6.5.0
*
* @return string The CSS styles for the router's top loading bar animation.
*/
private function get_router_animation_styles(): string {
return <<<CSS
.wp-interactivity-router-loading-bar {
position: fixed;
top: 0;
left: 0;
margin: 0;
padding: 0;
width: 100vw;
max-width: 100vw !important;
height: 4px;
background-color: #000;
opacity: 0
}
.wp-interactivity-router-loading-bar.start-animation {
animation: wp-interactivity-router-loading-bar-start-animation 30s cubic-bezier(0.03, 0.5, 0, 1) forwards
}
.wp-interactivity-router-loading-bar.finish-animation {
animation: wp-interactivity-router-loading-bar-finish-animation 300ms ease-in
}
@keyframes wp-interactivity-router-loading-bar-start-animation {
0% { transform: scaleX(0); transform-origin: 0 0; opacity: 1 }
100% { transform: scaleX(1); transform-origin: 0 0; opacity: 1 }
}
@keyframes wp-interactivity-router-loading-bar-finish-animation {
0% { opacity: 1 }
50% { opacity: 1 }
100% { opacity: 0 }
}
CSS;
}
/**
* Deprecated.
*
* @since 6.5.0
* @deprecated 6.7.0 Use {@see WP_Interactivity_API::print_router_markup} instead.
*/
public function print_router_loading_and_screen_reader_markup() {
_deprecated_function( __METHOD__, '6.7.0', 'WP_Interactivity_API::print_router_markup' );
// Call the new method.
$this->print_router_markup();
}
/**
* Outputs markup for the @wordpress/interactivity-router script module.
*
* This method prints a div element representing a loading bar visible during
* navigation.
*
* @since 6.7.0
*/
public function print_router_markup() {
echo <<<HTML
<div
class="wp-interactivity-router-loading-bar"
data-wp-interactive="core/router"
data-wp-class--start-animation="state.navigation.hasStarted"
data-wp-class--finish-animation="state.navigation.hasFinished"
></div>
HTML;
}
/**
* Processes the `data-wp-router-region` directive.
*
* It renders in the footer a set of HTML elements to notify users about
* client-side navigations. More concretely, the elements added are 1) a
* top loading bar to visually inform that a navigation is in progress
* and 2) an `aria-live` region for accessible navigation announcements.
*
* @since 6.5.0
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
*/
private function data_wp_router_region_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
if ( 'enter' === $mode && ! $this->has_processed_router_region ) {
$this->has_processed_router_region = true;
// Enqueues as an inline style.
wp_register_style( 'wp-interactivity-router-animations', false );
wp_add_inline_style( 'wp-interactivity-router-animations', $this->get_router_animation_styles() );
wp_enqueue_style( 'wp-interactivity-router-animations' );
// Adds the necessary markup to the footer.
add_action( 'wp_footer', array( $this, 'print_router_markup' ) );
}
}
/**
* Processes the `data-wp-each` directive.
*
* This directive gets an array passed as reference and iterates over it
* generating new content for each item based on the inner markup of the
* `template` tag.
*
* @since 6.5.0
* @since 6.9.0 Include the list path in the rendered `data-wp-each-child` directives.
*
* @param WP_Interactivity_API_Directives_Processor $p The directives processor instance.
* @param string $mode Whether the processing is entering or exiting the tag.
* @param array $tag_stack The reference to the tag stack.
*/
private function data_wp_each_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$tag_stack ) {
if ( 'enter' === $mode && 'TEMPLATE' === $p->get_tag() ) {
$entries = $this->get_directive_entries( $p, 'each' );
if ( count( $entries ) > 1 || empty( $entries ) ) {
// There should be only one `data-wp-each` directive per template tag.
return;
}
$entry = $entries[0];
if ( null !== $entry['unique_id'] ) {
return;
}
$item_name = isset( $entry['suffix'] ) ? $this->kebab_to_camel_case( $entry['suffix'] ) : 'item';
$result = $this->evaluate( $entry );
// Gets the content between the template tags and leaves the cursor in the closer tag.
$inner_content = $p->get_content_between_balanced_template_tags();
// Checks if there is a manual server-side directive processing.
$template_end = 'data-wp-each: template end';
$p->set_bookmark( $template_end );
$p->next_tag();
$manual_sdp = $p->get_attribute( 'data-wp-each-child' );
$p->seek( $template_end ); // Rewinds to the template closer tag.
$p->release_bookmark( $template_end );
/*
* It doesn't process in these situations:
* - Manual server-side directive processing.
* - Empty or non-array values.
* - Associative arrays because those are deserialized as objects in JS.
* - Templates that contain top-level texts because those texts can't be
* identified and removed in the client.
*/
if (
$manual_sdp ||
empty( $result ) ||
! is_array( $result ) ||
! array_is_list( $result ) ||
! str_starts_with( trim( $inner_content ), '<' ) ||
! str_ends_with( trim( $inner_content ), '>' )
) {
array_pop( $tag_stack );
return;
}
// Processes the inner content for each item of the array.
$processed_content = '';
foreach ( $result as $item ) {
// Creates a new context that includes the current item of the array.
$this->context_stack[] = array_replace_recursive(
end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
array( $entry['namespace'] => array( $item_name => $item ) )
);
// Processes the inner content with the new context.
$processed_item = $this->_process_directives( $inner_content );
if ( null === $processed_item ) {
// If the HTML is unbalanced, stop processing it.
array_pop( $this->context_stack );
return;
}
/*
* Adds the `data-wp-each-child` directive to each top-level tag
* rendered by this `data-wp-each` directive. The value is the
* `data-wp-each` directive's namespace and path.
*
* Nested `data-wp-each` directives could render
* `data-wp-each-child` elements at the top level as well, and
* they should be overwritten.
*
* @since 6.9.0
*/
$i = new WP_Interactivity_API_Directives_Processor( $processed_item );
while ( $i->next_tag() ) {
$i->set_attribute( 'data-wp-each-child', $entry['namespace'] . '::' . $entry['value'] );
$i->next_balanced_tag_closer_tag();
}
$processed_content .= $i->get_updated_html();
// Removes the current context from the stack.
array_pop( $this->context_stack );
}
// Appends the processed content after the tag closer of the template.
$p->append_content_after_template_tag_closer( $processed_content );
// Pops the last tag because it skipped the closing tag of the template tag.
array_pop( $tag_stack );
}
}
}
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