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<?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();
/**
* 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;
/**
* 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 $context_stack = null;
/**
* Gets and/or sets the initial state of an Interactivity API store for a
* given namespace.
*
* If state for that store namespace already exists, it merges the new
* provided state with the existing one.
*
* When no namespace is specified, it returns the state defined for the
* current value in the internal namespace stack during a `process_directives` call.
*
* @since 6.5.0
* @since 6.6.0 The `$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
*/
public function print_client_interactivity_data() {
if ( empty( $this->state_data ) && empty( $this->config_data ) ) {
return;
}
$interactivity_data = array();
$config = array();
foreach ( $this->config_data as $key => $value ) {
if ( ! empty( $value ) ) {
$config[ $key ] = $value;
}
}
if ( ! empty( $config ) ) {
$interactivity_data['config'] = $config;
}
$state = array();
foreach ( $this->state_data as $key => $value ) {
if ( ! empty( $value ) ) {
$state[ $key ] = $value;
}
}
if ( ! empty( $state ) ) {
$interactivity_data['state'] = $state;
}
if ( ! empty( $interactivity_data ) ) {
/*
* This data will be printed as JSON inside a script tag like this:
* <script type="application/json"></script>
*
* A script tag must be closed by a sequence beginning with `</`. It's impossible to
* close a script tag without using `<`. We ensure that `<` is escaped and `/` can
* remain unescaped, so `</script>` will be printed as `\u003C/script\u00E3`.
*
* - JSON_HEX_TAG: All < and > are converted to \u003C and \u003E.
* - JSON_UNESCAPED_SLASHES: Don't escape /.
*
* If the page will use UTF-8 encoding, it's safe to print unescaped unicode:
*
* - JSON_UNESCAPED_UNICODE: Encode multibyte Unicode characters literally (instead of as `\uXXXX`).
* - JSON_UNESCAPED_LINE_TERMINATORS: The line terminators are kept unescaped when
* JSON_UNESCAPED_UNICODE is supplied. It uses the same behaviour as it was
* before PHP 7.1 without this constant. Available as of PHP 7.1.0.
*
* The JSON specification requires encoding in UTF-8, so if the generated HTML page
* is not encoded in UTF-8 then it's not safe to include those literals. They must
* be escaped to avoid encoding issues.
*
* @see https://www.rfc-editor.org/rfc/rfc8259.html for details on encoding requirements.
* @see https://www.php.net/manual/en/json.constants.php for details on these constants.
* @see https://html.spec.whatwg.org/#script-data-state for details on script tag parsing.
*/
$json_encode_flags = JSON_HEX_TAG | JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_LINE_TERMINATORS;
if ( ! is_utf8_charset() ) {
$json_encode_flags = JSON_HEX_TAG | JSON_UNESCAPED_SLASHES;
}
wp_print_inline_script_tag(
wp_json_encode(
$interactivity_data,
$json_encode_flags
),
array(
'type' => 'application/json',
'id' => 'wp-interactivity-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();
}
/**
* Registers the `@wordpress/interactivity` script modules.
*
* @since 6.5.0
*/
public function register_script_modules() {
$suffix = wp_scripts_get_suffix();
wp_register_script_module(
'@wordpress/interactivity',
includes_url( "js/dist/interactivity$suffix.js" )
);
wp_register_script_module(
'@wordpress/interactivity-router',
includes_url( "js/dist/interactivity-router$suffix.js" ),
array( '@wordpress/interactivity' )
);
}
/**
* Adds the necessary hooks for the Interactivity API.
*
* @since 6.5.0
*/
public function add_hooks() {
add_action( 'wp_enqueue_scripts', array( $this, 'register_script_modules' ) );
add_action( 'wp_footer', array( $this, 'print_client_interactivity_data' ) );
add_action( 'admin_enqueue_scripts', array( $this, 'register_script_modules' ) );
add_action( 'admin_print_footer_scripts', array( $this, 'print_client_interactivity_data' ) );
}
/**
* 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 ) = end( $tag_stack );
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 {
if ( 0 !== count( $p->get_attribute_names_with_prefix( 'data-wp-each-child' ) ) ) {
/*
* 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 ) {
list( $directive_prefix ) = $this->extract_prefix_and_suffix( $attribute_name );
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(),
);
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 ) );
}
}
}
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 also
* display a notice to the developer to inform them about the issue.
*/
if ( $unbalanced || 0 < count( $tag_stack ) ) {
$tag_errored = 0 < count( $tag_stack ) ? end( $tag_stack )[0] : $tag_name;
/* translators: %1s: Namespace processed, %2s: The tag that caused the error; could be any HTML tag. */
$message = sprintf( __( 'Interactivity directives failed to process in "%1$s" due to a missing "%2$s" end tag.' ), end( $this->namespace_stack ), $tag_errored );
_doing_it_wrong( __METHOD__, $message, '6.6.0' );
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.
*
* @param string|true $directive_value The directive attribute value string or `true` when it's a boolean attribute.
* @return mixed|null The result of the evaluation. Null if the reference path doesn't exist or the namespace is falsy.
*/
private function evaluate( $directive_value ) {
$default_namespace = end( $this->namespace_stack );
$context = end( $this->context_stack );
list( $ns, $path ) = $this->extract_directive_value( $directive_value, $default_namespace );
if ( ! $ns || ! $path ) {
/* translators: %s: The directive value referenced. */
$message = sprintf( __( 'Namespace or reference path cannot be empty. Directive value referenced: %s' ), $directive_value );
_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 $path_segment ) {
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 {
return null;
}
}
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();
} 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;
}
/**
* Extracts the directive attribute name to separate and return the directive
* prefix and an optional suffix.
*
* The suffix is the string after the first double hyphen and the prefix is
* everything that comes before the suffix.
*
* Example:
*
* extract_prefix_and_suffix( 'data-wp-interactive' ) => array( 'data-wp-interactive', null )
* extract_prefix_and_suffix( 'data-wp-bind--src' ) => array( 'data-wp-bind', 'src' )
* extract_prefix_and_suffix( 'data-wp-foo--and--bar' ) => array( 'data-wp-foo', 'and--bar' )
*
* @since 6.5.0
*
* @param string $directive_name The directive attribute name.
* @return array An array containing the directive prefix and optional suffix.
*/
private function extract_prefix_and_suffix( string $directive_name ): array {
return explode( '--', $directive_name, 2 );
}
/**
* 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 );
}
/**
* Transforms a kebab-case string to camelCase.
*
* @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;
}
$attribute_value = $p->get_attribute( 'data-wp-context' );
$namespace_value = end( $this->namespace_stack );
// Separates the namespace from the context JSON object.
list( $namespace_value, $decoded_json ) = is_string( $attribute_value ) && ! empty( $attribute_value )
? $this->extract_directive_value( $attribute_value, $namespace_value )
: array( $namespace_value, null );
/*
* If there is a namespace, it adds a new context to the stack merging the
* previous context with the new one.
*/
if ( is_string( $namespace_value ) ) {
$this->context_stack[] = array_replace_recursive(
end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
array( $namespace_value => is_array( $decoded_json ) ? $decoded_json : array() )
);
} else {
/*
* If there is no namespace, it pushes the current context to the stack.
* It needs to do so because the function pops out the current context
* from the stack whenever it finds a `data-wp-context`'s closing tag.
*/
$this->context_stack[] = end( $this->context_stack );
}
}
/**
* 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 ) {
$all_bind_directives = $p->get_attribute_names_with_prefix( 'data-wp-bind--' );
foreach ( $all_bind_directives as $attribute_name ) {
list( , $bound_attribute ) = $this->extract_prefix_and_suffix( $attribute_name );
if ( empty( $bound_attribute ) ) {
return;
}
$attribute_value = $p->get_attribute( $attribute_name );
$result = $this->evaluate( $attribute_value );
if (
null !== $result &&
(
false !== $result ||
( strlen( $bound_attribute ) > 5 && '-' === $bound_attribute[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( $bound_attribute ) > 5 && '-' === $bound_attribute[4] )
) {
$result = $result ? 'true' : 'false';
}
$p->set_attribute( $bound_attribute, $result );
} else {
$p->remove_attribute( $bound_attribute );
}
}
}
}
/**
* 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--' );
foreach ( $all_class_directives as $attribute_name ) {
list( , $class_name ) = $this->extract_prefix_and_suffix( $attribute_name );
if ( empty( $class_name ) ) {
return;
}
$attribute_value = $p->get_attribute( $attribute_name );
$result = $this->evaluate( $attribute_value );
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 ) {
$all_style_attributes = $p->get_attribute_names_with_prefix( 'data-wp-style--' );
foreach ( $all_style_attributes as $attribute_name ) {
list( , $style_property ) = $this->extract_prefix_and_suffix( $attribute_name );
if ( empty( $style_property ) ) {
continue;
}
$directive_attribute_value = $p->get_attribute( $attribute_name );
$style_property_value = $this->evaluate( $directive_attribute_value );
$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 ) {
$attribute_value = $p->get_attribute( 'data-wp-text' );
$result = $this->evaluate( $attribute_value );
/*
* 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;
}
/**
* Outputs the markup for the top loading indicator and the screen reader
* notifications during client-side navigations.
*
* This method prints a div element representing a loading bar visible during
* navigation, as well as an aria-live region that can be read by screen
* readers to announce navigation status.
*
* @since 6.5.0
*/
public function print_router_loading_and_screen_reader_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>
<div
class="screen-reader-text"
aria-live="polite"
data-wp-interactive="core/router"
data-wp-text="state.navigation.message"
></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;
// Initialize the `core/router` store.
$this->state(
'core/router',
array(
'navigation' => array(
'texts' => array(
'loading' => __( 'Loading page, please wait.' ),
'loaded' => __( 'Page Loaded.' ),
),
),
)
);
// 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_loading_and_screen_reader_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
*
* @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() ) {
$attribute_name = $p->get_attribute_names_with_prefix( 'data-wp-each' )[0];
$extracted_suffix = $this->extract_prefix_and_suffix( $attribute_name );
$item_name = isset( $extracted_suffix[1] ) ? $this->kebab_to_camel_case( $extracted_suffix[1] ) : 'item';
$attribute_value = $p->get_attribute( $attribute_name );
$result = $this->evaluate( $attribute_value );
// 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;
}
// Extracts the namespace from the directive attribute value.
$namespace_value = end( $this->namespace_stack );
list( $namespace_value ) = is_string( $attribute_value ) && ! empty( $attribute_value )
? $this->extract_directive_value( $attribute_value, $namespace_value )
: array( $namespace_value, null );
// 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( $namespace_value => 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` to each top-level tag.
$i = new WP_Interactivity_API_Directives_Processor( $processed_item );
while ( $i->next_tag() ) {
$i->set_attribute( 'data-wp-each-child', true );
$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 );
}
}
}