WordPress/wp-includes/class-wp-block.php
Sergey Biryukov c03305852e Code Modernization: Add AllowDynamicProperties attribute to all (parent) classes.
Dynamic (non-explicitly declared) properties are deprecated as of PHP 8.2 and are expected to become a fatal error in PHP 9.0.

There are a number of ways to mitigate this:
* If it is an accidental typo for a declared property: fix the typo.
* For known properties: declare them on the class.
* For unknown properties: add the magic `__get()`, `__set()`, et al. methods to the class or let the class extend `stdClass` which has highly optimized versions of these magic methods built in.
* For unknown ''use'' of dynamic properties, the `#[AllowDynamicProperties]` attribute can be added to the class. The attribute will automatically be inherited by child classes.

Trac ticket #56034 is open to investigate and handle the third and fourth type of situations, however it has become clear this will need more time and will not be ready in time for WP 6.1.

To reduce “noise” in the meantime, both in the error logs of WP users moving onto PHP 8.2, in the test run logs of WP itself, in test runs of plugins and themes, as well as to prevent duplicate tickets from being opened for the same issue, this commit adds the `#[AllowDynamicProperties]` attribute to all “parent” classes in WP.

The logic used for this commit is as follows:
* If a class already has the attribute: no action needed.
* If a class does not `extend`: add the attribute.
* If a class does `extend`:
 - If it extends `stdClass`: no action needed (as `stdClass` supports dynamic properties).
 - If it extends a PHP native class: add the attribute.
 - If it extends a class from one of WP's external dependencies: add the attribute.
* In all other cases: no action — the attribute should not be needed as child classes inherit from the parent.

Whether or not a class contains magic methods has not been taken into account, as a review of the currently existing magic methods has shown that those are generally not sturdy enough and often even set dynamic properties (which they should not). See the [https://www.youtube.com/watch?v=vDZWepDQQVE live stream from August 16, 2022] for more details.

This commit only affects classes in the `src` directory of WordPress core.
* Tests should not get this attribute, but should be fixed to not use dynamic properties instead. Patches for this are already being committed under ticket #56033.
* While a number bundled themes (2014, 2019, 2020, 2021) contain classes, they are not a part of this commit and may be updated separately.

Reference: [https://wiki.php.net/rfc/deprecate_dynamic_properties PHP RFC: Deprecate dynamic properties].

Follow-up to [53922].

Props jrf, hellofromTonya, markjaquith, peterwilsoncc, costdev, knutsp, aristath.
See #56513, #56034.
Built from https://develop.svn.wordpress.org/trunk@54133


git-svn-id: http://core.svn.wordpress.org/trunk@53692 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-09-12 15:47:14 +00:00

306 lines
8.0 KiB
PHP

<?php
/**
* Blocks API: WP_Block class
*
* @package WordPress
* @since 5.5.0
*/
/**
* Class representing a parsed instance of a block.
*
* @since 5.5.0
* @property array $attributes
*/
#[AllowDynamicProperties]
class WP_Block {
/**
* Original parsed array representation of block.
*
* @since 5.5.0
* @var array
*/
public $parsed_block;
/**
* Name of block.
*
* @example "core/paragraph"
*
* @since 5.5.0
* @var string
*/
public $name;
/**
* Block type associated with the instance.
*
* @since 5.5.0
* @var WP_Block_Type
*/
public $block_type;
/**
* Block context values.
*
* @since 5.5.0
* @var array
*/
public $context = array();
/**
* All available context of the current hierarchy.
*
* @since 5.5.0
* @var array
* @access protected
*/
protected $available_context;
/**
* Block type registry.
*
* @since 5.9.0
* @var WP_Block_Type_Registry
* @access protected
*/
protected $registry;
/**
* List of inner blocks (of this same class)
*
* @since 5.5.0
* @var WP_Block_List
*/
public $inner_blocks = array();
/**
* Resultant HTML from inside block comment delimiters after removing inner
* blocks.
*
* @example "...Just <!-- wp:test /--> testing..." -> "Just testing..."
*
* @since 5.5.0
* @var string
*/
public $inner_html = '';
/**
* List of string fragments and null markers where inner blocks were found
*
* @example array(
* 'inner_html' => 'BeforeInnerAfter',
* 'inner_blocks' => array( block, block ),
* 'inner_content' => array( 'Before', null, 'Inner', null, 'After' ),
* )
*
* @since 5.5.0
* @var array
*/
public $inner_content = array();
/**
* Constructor.
*
* Populates object properties from the provided block instance argument.
*
* The given array of context values will not necessarily be available on
* the instance itself, but is treated as the full set of values provided by
* the block's ancestry. This is assigned to the private `available_context`
* property. Only values which are configured to consumed by the block via
* its registered type will be assigned to the block's `context` property.
*
* @since 5.5.0
*
* @param array $block Array of parsed block properties.
* @param array $available_context Optional array of ancestry context values.
* @param WP_Block_Type_Registry $registry Optional block type registry.
*/
public function __construct( $block, $available_context = array(), $registry = null ) {
$this->parsed_block = $block;
$this->name = $block['blockName'];
if ( is_null( $registry ) ) {
$registry = WP_Block_Type_Registry::get_instance();
}
$this->registry = $registry;
$this->block_type = $registry->get_registered( $this->name );
$this->available_context = $available_context;
if ( ! empty( $this->block_type->uses_context ) ) {
foreach ( $this->block_type->uses_context as $context_name ) {
if ( array_key_exists( $context_name, $this->available_context ) ) {
$this->context[ $context_name ] = $this->available_context[ $context_name ];
}
}
}
if ( ! empty( $block['innerBlocks'] ) ) {
$child_context = $this->available_context;
if ( ! empty( $this->block_type->provides_context ) ) {
foreach ( $this->block_type->provides_context as $context_name => $attribute_name ) {
if ( array_key_exists( $attribute_name, $this->attributes ) ) {
$child_context[ $context_name ] = $this->attributes[ $attribute_name ];
}
}
}
$this->inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry );
}
if ( ! empty( $block['innerHTML'] ) ) {
$this->inner_html = $block['innerHTML'];
}
if ( ! empty( $block['innerContent'] ) ) {
$this->inner_content = $block['innerContent'];
}
}
/**
* Returns a value from an inaccessible property.
*
* This is used to lazily initialize the `attributes` property of a block,
* such that it is only prepared with default attributes at the time that
* the property is accessed. For all other inaccessible properties, a `null`
* value is returned.
*
* @since 5.5.0
*
* @param string $name Property name.
* @return array|null Prepared attributes, or null.
*/
public function __get( $name ) {
if ( 'attributes' === $name ) {
$this->attributes = isset( $this->parsed_block['attrs'] ) ?
$this->parsed_block['attrs'] :
array();
if ( ! is_null( $this->block_type ) ) {
$this->attributes = $this->block_type->prepare_attributes_for_render( $this->attributes );
}
return $this->attributes;
}
return null;
}
/**
* Generates the render output for the block.
*
* @since 5.5.0
*
* @param array $options {
* Optional options object.
*
* @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.
* }
* @return string Rendered block output.
*/
public function render( $options = array() ) {
global $post;
$options = wp_parse_args(
$options,
array(
'dynamic' => true,
)
);
$is_dynamic = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic();
$block_content = '';
if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) {
$index = 0;
foreach ( $this->inner_content as $chunk ) {
if ( is_string( $chunk ) ) {
$block_content .= $chunk;
} else {
$inner_block = $this->inner_blocks[ $index ];
$parent_block = $this;
/** This filter is documented in wp-includes/blocks.php */
$pre_render = apply_filters( 'pre_render_block', null, $inner_block->parsed_block, $parent_block );
if ( ! is_null( $pre_render ) ) {
$block_content .= $pre_render;
} else {
$source_block = $inner_block->parsed_block;
/** This filter is documented in wp-includes/blocks.php */
$inner_block->parsed_block = apply_filters( 'render_block_data', $inner_block->parsed_block, $source_block, $parent_block );
/** This filter is documented in wp-includes/blocks.php */
$inner_block->context = apply_filters( 'render_block_context', $inner_block->context, $inner_block->parsed_block, $parent_block );
$block_content .= $inner_block->render();
}
$index++;
}
}
}
if ( $is_dynamic ) {
$global_post = $post;
$parent = WP_Block_Supports::$block_to_render;
WP_Block_Supports::$block_to_render = $this->parsed_block;
$block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this );
WP_Block_Supports::$block_to_render = $parent;
$post = $global_post;
}
if ( ! empty( $this->block_type->script ) ) {
wp_enqueue_script( $this->block_type->script );
}
if ( ! empty( $this->block_type->view_script ) && empty( $this->block_type->render_callback ) ) {
wp_enqueue_script( $this->block_type->view_script );
}
if ( ! empty( $this->block_type->style ) ) {
wp_enqueue_style( $this->block_type->style );
}
/**
* Filters the content of a single block.
*
* @since 5.0.0
* @since 5.9.0 The `$instance` parameter was added.
*
* @param string $block_content The block content.
* @param array $block The full block, including name and attributes.
* @param WP_Block $instance The block instance.
*/
$block_content = apply_filters( 'render_block', $block_content, $this->parsed_block, $this );
/**
* Filters the content of a single block.
*
* The dynamic portion of the hook name, `$name`, refers to
* the block name, e.g. "core/paragraph".
*
* @since 5.7.0
* @since 5.9.0 The `$instance` parameter was added.
*
* @param string $block_content The block content.
* @param array $block The full block, including name and attributes.
* @param WP_Block $instance The block instance.
*/
$block_content = apply_filters( "render_block_{$this->name}", $block_content, $this->parsed_block, $this );
return $block_content;
}
}