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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(); /* * 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; } // Skip if the suffix is an event handler. if ( str_starts_with( $entry['suffix'], 'on' ) ) { _doing_it_wrong( __METHOD__, sprintf( / translators: %s: The directive, e.g. data-wp-on--click. / __( 'Binding event handler attributes is not supported. Please use "%s" instead.' ), esc_attr( 'data-wp-on--' . substr( $entry['suffix'], 2 ) ) ), '6.9.2' ); continue; } $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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