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Ignore:
Timestamp:
06/04/2024 10:59:01 AM (13 months ago)
Author:
gziolo
Message:

Interactivity API: Directives cannot derive state on the server

The Interactivity API has a concept of "derived state" but it only worked on the client (JavaScript). This is the implementation that mirrors it, so derived state has good server-side solution.

Props jonsurrell, darerodz, gziolo, luisherranz, cbravobernal.
Fixes #61037.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/src/wp-includes/interactivity-api/class-wp-interactivity-api.php

    r58321 r58327  
    7575
    7676    /**
     77     * Stack of namespaces defined by `data-wp-interactive` directives, in
     78     * the order they are processed.
     79     *
     80     * This is only available during directive processing, otherwise it is `null`.
     81     *
     82     * @since 6.6.0
     83     * @var array<string>|null
     84     */
     85    private $namespace_stack = null;
     86
     87    /**
     88     * Stack of contexts defined by `data-wp-context` directives, in
     89     * the order they are processed.
     90     *
     91     * This is only available during directive processing, otherwise it is `null`.
     92     *
     93     * @since 6.6.0
     94     * @var array<array<mixed>>|null
     95     */
     96    private $context_stack = null;
     97
     98    /**
    7799     * Gets and/or sets the initial state of an Interactivity API store for a
    78100     * given namespace.
     
    81103     * provided state with the existing one.
    82104     *
    83      * @since 6.5.0
    84      *
    85      * @param string $store_namespace The unique store namespace identifier.
     105     * When no namespace is specified, it returns the state defined for the
     106     * current value in the internal namespace stack during a `process_directives` call.
     107     *
     108     * @since 6.5.0
     109     * @since 6.6.0 The `$store_namespace` param is optional.
     110     *
     111     * @param string $store_namespace Optional. The unique store namespace identifier.
    86112     * @param array  $state           Optional. The array that will be merged with the existing state for the specified
    87113     *                                store namespace.
     
    89115     *               argument was provided.
    90116     */
    91     public function state( string $store_namespace, array $state = array() ): array {
     117    public function state( ?string $store_namespace = null, ?array $state = null ): array {
     118        if ( ! $store_namespace ) {
     119            if ( $state ) {
     120                _doing_it_wrong(
     121                    __METHOD__,
     122                    __( 'The namespace is required when state data is passed.' ),
     123                    '6.6.0'
     124                );
     125                return array();
     126            }
     127            if ( null !== $store_namespace ) {
     128                _doing_it_wrong(
     129                    __METHOD__,
     130                    __( 'The namespace should be a non-empty string.' ),
     131                    '6.6.0'
     132                );
     133                return array();
     134            }
     135            if ( null === $this->namespace_stack ) {
     136                _doing_it_wrong(
     137                    __METHOD__,
     138                    __( 'The namespace can only be omitted during directive processing.' ),
     139                    '6.6.0'
     140                );
     141                return array();
     142            }
     143
     144            $store_namespace = end( $this->namespace_stack );
     145        }
    92146        if ( ! isset( $this->state_data[ $store_namespace ] ) ) {
    93147            $this->state_data[ $store_namespace ] = array();
     
    213267
    214268    /**
     269     * Returns the latest value on the context stack with the passed namespace.
     270     *
     271     * When the namespace is omitted, it uses the current namespace on the
     272     * namespace stack during a `process_directives` call.
     273     *
     274     * @since 6.6.0
     275     *
     276     * @param string $store_namespace Optional. The unique store namespace identifier.
     277     */
     278    public function get_context( ?string $store_namespace = null ): array {
     279        if ( null === $this->context_stack ) {
     280            _doing_it_wrong(
     281                __METHOD__,
     282                __( 'The context can only be read during directive processing.' ),
     283                '6.6.0'
     284            );
     285            return array();
     286        }
     287
     288        if ( ! $store_namespace ) {
     289            if ( null !== $store_namespace ) {
     290                _doing_it_wrong(
     291                    __METHOD__,
     292                    __( 'The namespace should be a non-empty string.' ),
     293                    '6.6.0'
     294                );
     295                return array();
     296            }
     297
     298            $store_namespace = end( $this->namespace_stack );
     299        }
     300
     301        $context = end( $this->context_stack );
     302
     303        return ( $store_namespace && $context && isset( $context[ $store_namespace ] ) )
     304            ? $context[ $store_namespace ]
     305            : array();
     306    }
     307
     308    /**
    215309     * Registers the `@wordpress/interactivity` script modules.
    216310     *
     
    259353        }
    260354
    261         $context_stack   = array();
    262         $namespace_stack = array();
    263         $result          = $this->process_directives_args( $html, $context_stack, $namespace_stack );
     355        $this->namespace_stack = array();
     356        $this->context_stack   = array();
     357
     358        $result = $this->_process_directives( $html );
     359
     360        $this->namespace_stack = null;
     361        $this->context_stack   = null;
     362
    264363        return null === $result ? $html : $result;
    265364    }
     
    269368     * and updates the markup accordingly.
    270369     *
    271      * It needs the context and namespace stacks to be passed by reference, and
    272      * it returns null if the HTML contains unbalanced tags.
    273      *
    274      * @since 6.5.0
    275      * @since 6.6.0 The function displays a warning message when the HTML contains unbalanced tags or a directive appears in a MATH or SVG tag.
    276      *
    277      * @param string $html            The HTML content to process.
    278      * @param array  $context_stack   The reference to the array used to keep track of contexts during processing.
    279      * @param array  $namespace_stack The reference to the array used to manage namespaces during processing.
     370     * It uses the WP_Interactivity_API instance's context and namespace stacks,
     371     * which are shared between all calls.
     372     *
     373     * This method returns null if the HTML contains unbalanced tags.
     374     *
     375     * @since 6.6.0
     376     *
     377     * @param string $html The HTML content to process.
    280378     * @return string|null The processed HTML content. It returns null when the HTML contains unbalanced tags.
    281379     */
    282     private function process_directives_args( string $html, array &$context_stack, array &$namespace_stack ) {
     380    private function _process_directives( string $html ) {
    283381        $p          = new WP_Interactivity_API_Directives_Processor( $html );
    284382        $tag_stack  = array();
     
    287385        $directive_processor_prefixes          = array_keys( self::$directive_processors );
    288386        $directive_processor_prefixes_reversed = array_reverse( $directive_processor_prefixes );
     387
     388        /*
     389         * Save the current size for each stack to restore them in case
     390         * the processing finds unbalanced tags.
     391         */
     392        $namespace_stack_size = count( $this->namespace_stack );
     393        $context_stack_size   = count( $this->context_stack );
    289394
    290395        while ( $p->next_tag( array( 'tag_closers' => 'visit' ) ) ) {
     
    299404                if ( $p->get_attribute_names_with_prefix( 'data-wp-' ) ) {
    300405                    /* translators: 1: SVG or MATH HTML tag, 2: Namespace of the interactive block. */
    301                     $message = sprintf( __( 'Interactivity directives were detected on an incompatible %1$s tag when processing "%2$s". These directives will be ignored in the server side render.' ), $tag_name, end( $namespace_stack ) );
     406                    $message = sprintf( __( 'Interactivity directives were detected on an incompatible %1$s tag when processing "%2$s". These directives will be ignored in the server side render.' ), $tag_name, end( $this->namespace_stack ) );
    302407                    _doing_it_wrong( __METHOD__, $message, '6.6.0' );
    303408                }
     
    382487                        : array( $this, self::$directive_processors[ $directive_prefix ] );
    383488
    384                     call_user_func_array(
    385                         $func,
    386                         array( $p, $mode, &$context_stack, &$namespace_stack, &$tag_stack )
    387                     );
    388                 }
    389             }
    390         }
     489                    call_user_func_array( $func, array( $p, $mode, &$tag_stack ) );
     490                }
     491            }
     492        }
     493
     494        if ( $unbalanced ) {
     495            // Reset the namespace and context stacks to their previous values.
     496            array_splice( $this->namespace_stack, $namespace_stack_size );
     497            array_splice( $this->context_stack, $context_stack_size );
     498        }
     499
    391500        /*
    392501         * It returns null if the HTML is unbalanced because unbalanced HTML is
     
    398507            $tag_errored = 0 < count( $tag_stack ) ? end( $tag_stack )[0] : $tag_name;
    399508            /* translators: %1s: Namespace processed, %2s: The tag that caused the error; could be any HTML tag.  */
    400             $message = sprintf( __( 'Interactivity directives failed to process in "%1$s" due to a missing "%2$s" end tag.' ), end( $namespace_stack ), $tag_errored );
     509            $message = sprintf( __( 'Interactivity directives failed to process in "%1$s" due to a missing "%2$s" end tag.' ), end( $this->namespace_stack ), $tag_errored );
    401510            _doing_it_wrong( __METHOD__, $message, '6.6.0' );
    402511            return null;
     
    412521     * @since 6.5.0
    413522     * @since 6.6.0 The function now adds a warning when the namespace is null, falsy, or the directive value is empty.
    414      *
    415      * @param string|true $directive_value   The directive attribute value string or `true` when it's a boolean attribute.
    416      * @param string      $default_namespace The default namespace to use if none is explicitly defined in the directive
    417      *                                       value.
    418      * @param array|false $context           The current context for evaluating the directive or false if there is no
    419      *                                       context.
     523     * @since 6.6.0 Removed `default_namespace` and `context` arguments.
     524     *
     525     * @param string|true $directive_value The directive attribute value string or `true` when it's a boolean attribute.
    420526     * @return mixed|null The result of the evaluation. Null if the reference path doesn't exist or the namespace is falsy.
    421527     */
    422     private function evaluate( $directive_value, string $default_namespace, $context = false ) {
     528    private function evaluate( $directive_value ) {
     529        $default_namespace = end( $this->namespace_stack );
     530        $context           = end( $this->context_stack );
     531
    423532        list( $ns, $path ) = $this->extract_directive_value( $directive_value, $default_namespace );
    424533        if ( ! $ns || ! $path ) {
     
    451560        }
    452561
     562        if ( $current instanceof Closure ) {
     563            /*
     564             * This state getter's namespace is added to the stack so that
     565             * `state()` or `get_config()` read that namespace when called
     566             * without specifying one.
     567             */
     568            array_push( $this->namespace_stack, $ns );
     569            try {
     570                $current = $current();
     571            } catch ( Throwable $e ) {
     572                _doing_it_wrong(
     573                    __METHOD__,
     574                    sprintf(
     575                        /* translators: 1: Path pointing to an Interactivity API state property, 2: Namespace for an Interactivity API store. */
     576                        __( 'Uncaught error executing a derived state callback with path "%1$s" and namespace "%2$s".' ),
     577                        $path,
     578                        $ns
     579                    ),
     580                    '6.6.0'
     581                );
     582                return null;
     583            } finally {
     584                // Remove the property's namespace from the stack.
     585                array_pop( $this->namespace_stack );
     586            }
     587        }
     588
    453589        // Returns the opposite if it contains a negation operator (!).
    454590        return $should_negate_value ? ! $current : $current;
     
    552688     * @since 6.5.0
    553689     *
    554      * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    555      * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    556      * @param array                                     $context_stack   The reference to the context stack.
    557      * @param array                                     $namespace_stack The reference to the store namespace stack.
    558      */
    559     private function data_wp_interactive_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack ) {
     690     * @param WP_Interactivity_API_Directives_Processor $p    The directives processor instance.
     691     * @param string                                    $mode Whether the processing is entering or exiting the tag.
     692     */
     693    private function data_wp_interactive_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
    560694        // When exiting tags, it removes the last namespace from the stack.
    561695        if ( 'exit' === $mode ) {
    562             array_pop( $namespace_stack );
     696            array_pop( $this->namespace_stack );
    563697            return;
    564698        }
     
    584718            }
    585719        }
    586         $namespace_stack[] = ( $new_namespace && 1 === preg_match( '/^([\w\-_\/]+)/', $new_namespace ) )
     720        $this->namespace_stack[] = ( $new_namespace && 1 === preg_match( '/^([\w\-_\/]+)/', $new_namespace ) )
    587721            ? $new_namespace
    588             : end( $namespace_stack );
     722            : end( $this->namespace_stack );
    589723    }
    590724
     
    599733     * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    600734     * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    601      * @param array                                     $context_stack   The reference to the context stack.
    602      * @param array                                     $namespace_stack The reference to the store namespace stack.
    603      */
    604     private function data_wp_context_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack ) {
     735     */
     736    private function data_wp_context_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
    605737        // When exiting tags, it removes the last context from the stack.
    606738        if ( 'exit' === $mode ) {
    607             array_pop( $context_stack );
     739            array_pop( $this->context_stack );
    608740            return;
    609741        }
    610742
    611743        $attribute_value = $p->get_attribute( 'data-wp-context' );
    612         $namespace_value = end( $namespace_stack );
     744        $namespace_value = end( $this->namespace_stack );
    613745
    614746        // Separates the namespace from the context JSON object.
     
    622754         */
    623755        if ( is_string( $namespace_value ) ) {
    624             $context_stack[] = array_replace_recursive(
    625                 end( $context_stack ) !== false ? end( $context_stack ) : array(),
     756            $this->context_stack[] = array_replace_recursive(
     757                end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
    626758                array( $namespace_value => is_array( $decoded_json ) ? $decoded_json : array() )
    627759            );
     
    632764             * from the stack whenever it finds a `data-wp-context`'s closing tag.
    633765             */
    634             $context_stack[] = end( $context_stack );
     766            $this->context_stack[] = end( $this->context_stack );
    635767        }
    636768    }
     
    646778     * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    647779     * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    648      * @param array                                     $context_stack   The reference to the context stack.
    649      * @param array                                     $namespace_stack The reference to the store namespace stack.
    650      */
    651     private function data_wp_bind_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack ) {
     780     */
     781    private function data_wp_bind_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
    652782        if ( 'enter' === $mode ) {
    653783            $all_bind_directives = $p->get_attribute_names_with_prefix( 'data-wp-bind--' );
     
    660790
    661791                $attribute_value = $p->get_attribute( $attribute_name );
    662                 $result          = $this->evaluate( $attribute_value, end( $namespace_stack ), end( $context_stack ) );
     792                $result          = $this->evaluate( $attribute_value );
    663793
    664794                if (
     
    700830     * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    701831     * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    702      * @param array                                     $context_stack   The reference to the context stack.
    703      * @param array                                     $namespace_stack The reference to the store namespace stack.
    704      */
    705     private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack ) {
     832     */
     833    private function data_wp_class_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
    706834        if ( 'enter' === $mode ) {
    707835            $all_class_directives = $p->get_attribute_names_with_prefix( 'data-wp-class--' );
     
    714842
    715843                $attribute_value = $p->get_attribute( $attribute_name );
    716                 $result          = $this->evaluate( $attribute_value, end( $namespace_stack ), end( $context_stack ) );
     844                $result          = $this->evaluate( $attribute_value );
    717845
    718846                if ( $result ) {
     
    735863     * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    736864     * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    737      * @param array                                     $context_stack   The reference to the context stack.
    738      * @param array                                     $namespace_stack The reference to the store namespace stack.
    739      */
    740     private function data_wp_style_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack ) {
     865     */
     866    private function data_wp_style_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
    741867        if ( 'enter' === $mode ) {
    742868            $all_style_attributes = $p->get_attribute_names_with_prefix( 'data-wp-style--' );
     
    749875
    750876                $directive_attribute_value = $p->get_attribute( $attribute_name );
    751                 $style_property_value      = $this->evaluate( $directive_attribute_value, end( $namespace_stack ), end( $context_stack ) );
     877                $style_property_value      = $this->evaluate( $directive_attribute_value );
    752878                $style_attribute_value     = $p->get_attribute( 'style' );
    753879                $style_attribute_value     = ( $style_attribute_value && ! is_bool( $style_attribute_value ) ) ? $style_attribute_value : '';
     
    828954     * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    829955     * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    830      * @param array                                     $context_stack   The reference to the context stack.
    831      * @param array                                     $namespace_stack The reference to the store namespace stack.
    832      */
    833     private function data_wp_text_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack ) {
     956     */
     957    private function data_wp_text_processor( WP_Interactivity_API_Directives_Processor $p, string $mode ) {
    834958        if ( 'enter' === $mode ) {
    835959            $attribute_value = $p->get_attribute( 'data-wp-text' );
    836             $result          = $this->evaluate( $attribute_value, end( $namespace_stack ), end( $context_stack ) );
     960            $result          = $this->evaluate( $attribute_value );
    837961
    838962            /*
     
    9661090     * @param WP_Interactivity_API_Directives_Processor $p               The directives processor instance.
    9671091     * @param string                                    $mode            Whether the processing is entering or exiting the tag.
    968      * @param array                                     $context_stack   The reference to the context stack.
    969      * @param array                                     $namespace_stack The reference to the store namespace stack.
    9701092     * @param array                                     $tag_stack       The reference to the tag stack.
    9711093     */
    972     private function data_wp_each_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$context_stack, array &$namespace_stack, array &$tag_stack ) {
     1094    private function data_wp_each_processor( WP_Interactivity_API_Directives_Processor $p, string $mode, array &$tag_stack ) {
    9731095        if ( 'enter' === $mode && 'TEMPLATE' === $p->get_tag() ) {
    9741096            $attribute_name   = $p->get_attribute_names_with_prefix( 'data-wp-each' )[0];
     
    9761098            $item_name        = isset( $extracted_suffix[1] ) ? $this->kebab_to_camel_case( $extracted_suffix[1] ) : 'item';
    9771099            $attribute_value  = $p->get_attribute( $attribute_name );
    978             $result           = $this->evaluate( $attribute_value, end( $namespace_stack ), end( $context_stack ) );
     1100            $result           = $this->evaluate( $attribute_value );
    9791101
    9801102            // Gets the content between the template tags and leaves the cursor in the closer tag.
     
    10101132
    10111133            // Extracts the namespace from the directive attribute value.
    1012             $namespace_value         = end( $namespace_stack );
     1134            $namespace_value         = end( $this->namespace_stack );
    10131135            list( $namespace_value ) = is_string( $attribute_value ) && ! empty( $attribute_value )
    10141136                ? $this->extract_directive_value( $attribute_value, $namespace_value )
     
    10191141            foreach ( $result as $item ) {
    10201142                // Creates a new context that includes the current item of the array.
    1021                 $context_stack[] = array_replace_recursive(
    1022                     end( $context_stack ) !== false ? end( $context_stack ) : array(),
     1143                $this->context_stack[] = array_replace_recursive(
     1144                    end( $this->context_stack ) !== false ? end( $this->context_stack ) : array(),
    10231145                    array( $namespace_value => array( $item_name => $item ) )
    10241146                );
    10251147
    10261148                // Processes the inner content with the new context.
    1027                 $processed_item = $this->process_directives_args( $inner_content, $context_stack, $namespace_stack );
     1149                $processed_item = $this->_process_directives( $inner_content );
    10281150
    10291151                if ( null === $processed_item ) {
    10301152                    // If the HTML is unbalanced, stop processing it.
    1031                     array_pop( $context_stack );
     1153                    array_pop( $this->context_stack );
    10321154                    return;
    10331155                }
     
    10421164
    10431165                // Removes the current context from the stack.
    1044                 array_pop( $context_stack );
     1166                array_pop( $this->context_stack );
    10451167            }
    10461168
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